Network parameter-huawei[1]

Data Configuration Reference − Network Planning Parameters M900/M1800 Base Station Controller Table of Contents

Huawei Technologies Proprietary

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Table of Contents

Chapter 1 Foreword....................................................................................................................... 1-1 1.1 Types of Radio Parameter Adjustment.............................................................................. 1-2 1.2 Prerequisites for Radio Parameter Adjustment ................................................................. 1-2 1.3 Points for Attention in Radio Parameter Adjustment ......................................................... 1-3

Chapter 2 Data Configuration ...................................................................................................... 2-1 2.1 Local Office ........................................................................................................................ 2-1

2.1.1 BSC Cell Table........................................................................................................ 2-1 2.1.2 Frequency Hopping Data Table .............................................................................. 2-4 2.1.3 Radio Channel Configuration Table........................................................................ 2-7

2.2 Site..................................................................................................................................... 2-9 2.2.1 Carrier Configuration Table..................................................................................... 2-9 2.2.2 Antenna and Feeder Configuration Table............................................................. 2-10

2.3 Cells ................................................................................................................................. 2-11 2.3.1 System Information Table ..................................................................................... 2-11 2.3.2 Cell Configuration Table........................................................................................ 2-30 2.3.3 Cell Allocation Table ............................................................................................. 2-34 2.3.4 BA1 Table.............................................................................................................. 2-35 2.3.5 BA2 (SACCH) Table ............................................................................................. 2-35 2.3.6 Cell Attribute Table................................................................................................ 2-36 2.3.7 Cell Alarm Threshold Table................................................................................... 2-50 2.3.8 Cell Call Control Table .......................................................................................... 2-52 2.3.9 Cell Call Control Parameter Table ........................................................................ 2-57 2.3.10 Cell Module Information Table ............................................................................ 2-63

2.4 Handover ......................................................................................................................... 2-64 2.4.1 Handover Control Data Table ............................................................................... 2-65 2.4.2 Cell Description Table ........................................................................................... 2-72 2.4.3 External Cell Description Table............................................................................. 2-76 2.4.4 Neighboring Cell Relation Table ........................................................................... 2-76 2.4.5 Filter Data Table.................................................................................................... 2-77 2.4.6 Penalty Table ........................................................................................................ 2-79 2.4.7 Emergency Handover Table ................................................................................. 2-81 2.4.8 Load Handover Data Table ................................................................................... 2-84 2.4.9 Normal Handover Data Table ............................................................................... 2-86 2.4.10 MS Fast Moving HO Data Table ......................................................................... 2-89 2.4.11 Intra-cell Handover Data Table ........................................................................... 2-90 2.4.12 GSM0508 Handover Table ................................................................................. 2-91 2.4.13 Concentric Cell Handover Table ......................................................................... 2-91

Data Configuration Reference − Network Planning Parameters M900/M1800 Base Station Controller Table of Contents


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2.5 Power Control ................................................................................................................ 2-100 2.5.1 Power Control Selection Table............................................................................ 2-100 2.5.2 Ordinary Cell PC Table ....................................................................................... 2-101 2.5.3 BTS Power Control Data Table........................................................................... 2-104 2.5.4 MS Power Control Data Table ............................................................................ 2-107 2.5.5 HW II Power Control Data Table......................................................................... 2-110 2.5.6 Table of BTS Power Control Data (AMR) ........................................................... 2-118 2.5.7 Table of MS Power Control Data (AMR)............................................................. 2-121 2.5.8 Table of Power Control Data for Huawei II (AMR) .............................................. 2-124

2.6 Channels........................................................................................................................ 2-132 2.6.1 Radio Channel Management Control Table........................................................ 2-132 2.6.2 HW II Channel Allocation Table .......................................................................... 2-136

Chapter 3 BCCH participate in FH Data Configuration.............................................................. 3-1 3.1 Overview ............................................................................................................................ 3-1 3.2 Data Configuration............................................................................................................. 3-1

Data Configuration Reference − Network Planning Parameters M900/M1800 Base Station Controller Chapter 1 Foreword


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Chapter 1 Foreword

GSM9001800 BSS Network Planning Parameters ReferenceV3.2 is for Huawei’s GSM BSC 06.1120A version. The difference from the former version is referred to Chapter5.

The GSM system can be divided into three parts in physical structure of the network: the network subsystem (NSS), the base station subsystem (BSS), and the MS (MS). In the signaling structure, the GSM system –consists of MAP interface, A-interface (interface between MSC and BSC), Abis interface (interface between BSC and BTS) and Um interface (interface between BTS and MS). All these entities and interfaces have plenty of configuration parameters and performance parameters. Some of them have already been determined during the equipment development stage. Most are determined by the network operators as according to the actual requirements and actual running. The settings and adjustments of those parameters have considerable impacts on the operation of the whole GSM network. Therefore, network optimization is the process of settings and adjustments of various parameters.

The GSM network has parameters related to radio devices and radio interfaces that can impact the network performance. The radio parameters in the GSM network refer to those related to radio devices and radio resources. These parameters have vital impact on the coverage, distribution of signaling flow and network performance. Thus, adjustment of radio parameters is an important part of the optimization.

The GSM radio parameters can be divided into two types as according to the service targets of the radio parameters, i.e., engineering parameters and resource parameters. The engineering parameters are related to engineering design, installation and commissioning such as antenna height, antenna direction, antenna gain, antenna downtilt and cable attenuation. These parameters must be determined during network design. These parameters can hardly be changed during network operation. The resources parameters refer to those related to the configuration and usage of radio resources. They are normally transmitted on Um interface to keep the consistency between the base station and MS. Most resources parameters can be dynamically adjusted through certain man machine interfaces (MMI) during network operation. The radio parameters involved in this document are mainly radio resources parameters (unless otherwise specify, the parameters described here are radio resources parameters).

When an operator is to construct a mobile communications network, he must first make engineering design according to geographic environments, service forecast, radio channel features, and etc. The design should include network structure design,



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base station location selection and frequency planning. During the network operation, the operator may need to adjust the network configurations and parameters so as to improve network performance. This is an important part of the whole network optimization process.

Radio parameter optimization is a process to improve the communication quality, the network performance, and the equipment utilization rate by adjusting the partial or global radio parameters as according to the actual radio channel features, traffic features, and signaling flow bearing. The basic principle of radio parameter adjustment is to make full use of existing radio resources, balance the global traffic and signaling flow through load-sharing so as to achieve a better network performance.

1.1 Types of Radio Parameter Adjustment

There are two types of radio parameter adjustment. The first type of Radio Parameter Adjustment is to solve static problems as according to the actual average traffic and signaling flow. The other type of Radio Parameter Adjustment is to solve problems in traffic overloading and channel congestion.

For the first type of adjustment, the operator has to test the actual running of the network periodically. On the basis of the test results adjust the global or partial network parameters and configurations. While for the second type of adjustment, the operator needs to adjust some radio parameters – as according to the real-time driver test and the traffic statistics data. This document describes the meaning of the parameters and analyses the impact of parameter adjustment on the whole network performance.

1.2 Prerequisites for Radio Parameter Adjustment

The network operator must know the meaning, adjustment method and the result of the adjustments of each radio network parameter. The network operator should be very experienced in the radio network parameters. This is a necessary condition to adjust radio network parameters effectively. Meanwhile, the adjustment of radio parameters depends on many testing data during network operation. Generally, these data can be obtained in two ways. Firstly, the statistical data can be obtained from the Operation Maintenance Center (OMC) such as the load of CCCH, RACH channels. Secondly, other data such as the coverage, and the MS speech quality, should be obtained from actual measurements and tests. Therefore, frequent and long-term measurements of various network features are necessary for effective radio parameter adjustment.



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1.3 Points for Attention in Radio Parameter Adjustment

In the GSM system, many radio network parameters are set on the basis of cells and local areas (LA). As inter-region parameters are often strongly interrelated, during adjustment of those parameters, consideration must be given to the impact on other areas, especially on neighboring cells. Otherwise, parameter adjustment will bring about negative consequences.

Besides, when a problem occurs in a region, make sure whether it is caused by equipment faults (including connection failure). Only when it is confirmed that network problems are caused by service causes then radio parameter adjustment is performed. The radio parameter adjustments recommended in this document assume that no device problems exist.

Data Configuration Reference − Network Planning Parameters M900/M1800 Base Station Controller Chapter 2 Data Configuration


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Chapter 2 Data Configuration

2.1 Local Office

2.1.1 BSC Cell Table

Cell system type

Range: GSM900, GSM1800, GSM900/GSM1800, PCS1900, GSM850

Unit -

Default: GSM900

Description: M900/M1800 BSC supports both the independent and hybrid network structures of both 900M and 1800M. The frequency band can be set as "GSM900". Or "GSM1800", or GSM900/GSM1800 as according to the actual situation. Huawei M900/M1800 BSC supports the networking of PCS1900M,

GSM850M, the hybrid networking of GSM900 and PCS1900, and

the hybrid networking of GSM850 and GSM900/GSM1800.

It does not support the hybrid networking of 1900M and 1800M..

Hybrid cell possesses the following features in respect of data configuration:

1, Hybrid cell supports both M900 and M1800.

2, Hybrid cell must also be concentric cell.

3, Primary BCCH channel, combined BCCH channel / BCCH + CBCH channel and BCH channel configured on different TRXs must be in OverLaid subcell. TRXs in the same frequency band with the TRX that the BCCH is configured on are also in OverLaid subcell, and the other TRXs are in UnderLaid subcell.

4, SDCCH and some data service relative channel (dynamic PDCH and static PDCH) must be configured on TRXs in OverLaid subcell.

5, A cell can not be configured as hybrid cell if it is configured as 2-timeslots extension cell and vice versa. But no such restriction is presented for other normal cells or single-timeslot extension cell.

6, In hybrid cell, M900 and M1800 can not be in the same frequency hopping group simultaneously.

Sub cell type



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Range: Normal, upper layer and lower layer.

Unit -

Default: "normal"

Description: Use to determine a cell class in a hierarchical structure so as to differentiate macro-cell, micro-cell, and to realize load-sharing and inter-layer handover.

cell class

Range: Medium layer, upper layer, and lower layer.

Unit -

Default: "upper layer"

Description: Use to determine a cell class in a hierarchical structure so as to differentiate macro-cell, micro-cell, and to realize load-sharing and inter-layer handover.

BCC

Range: 0–7

Unit -

Default: -

Description: BCC is Base Station Color Code. It is used to distinguish among neighboring cells with the same BCCH frequency. In cells that use frequency hopping, the TSC in the frequency hopping data table must be configured to be consistent with the BCC in the cell.

Regarding the protection against co-channel interference, the MS reports the BCC value so that the BSC can distinguish among different cells transmitting on the same frequency. For this purpose the BCC must be allocated as wisely as possible. If frequency reuse clusters are used then it is recommended that all BTSs in a given cluster use the same BCC. In this way the reuse distance of a certain BCC can be maximized according to the frequency reuse distance.

Note that only 8 different values (BCC: 0 to 7) are used for the purpose of recognizing co-channel interference.

Note: 1. After modify the BCC of the cell, you shall modify the TSC in the frequency hopping table correspondingly.

2. Known by the transmit end and the receive end, the TSC is used to locate the position of other bits in the same bust and judge whether the received signals of the same frequencies are valid. The burst that is no consistent with the known TSC cannot be decoded.

3. According to the GSM protocols, the TSC must be the same with the BCC regarding the broadcast and common control channels. For the TCH channel, the BCC is not required to be the same with the TSC. But many manufacturers sets the BCC and the TSC same



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by force (including for TCH channel). Therefore, it is recommended to set BCC=TSC in actual data configuration.

4. Common BCCH frequency and common BSIC causes the following problems:

1) In the RACH, the NCC and BCC of the target cell are used to read the meaning of the access information. If there are common frequencies and common BSICs, th random access information (including handover access) may be processed in the non-serving cell in case of over-cell coverage. This leads to the SDCCH allocated abnormally or congested.

2) Common BCCH frequencies and common BSICs may also cause the error handover judgment. Although two cells are not defined as neighbors, if they have the common BCCH frequency and common BSIC, MS may handover to the cell due to its strong signals.

3) When the TCH co-channel interference or the frequency hopping co-channel interference occurs, the TSC (same with BCC) in the TCH is an important criterion to judge the useful voice frame and useless voice frame. Therefore, reasonable BCC planning can reduce the interference’s effect on voice.

5. The BCC planning priciples: keep the common BCCs far away from each other. Keep the common BCCH frequencies and common BSICs far away from each other

The specific requirements are as follows:

1) In the frequency planning, especially the 1X1 and 1X3 fruqency hopping nework planning, the probability o the TCH frequency interference is high. Therefore, when plan the BCC, set eight bas station as a cluster and one base station uses one BCC.

2) Any frequency planning shall meet the principles of keeping common BCCH frequencies and common BSICs far away from each other. When the BCCH frequencies are the same, try to set the BSICs different. If conflict with the BCC planning principles, try to modify the NCC to avoid the common frequency and common BSIC when NCC can be modified.

NCC

Range: 0–7

Unit -

Default: -

Description: The NCC is Network Color Code. It is used to discriminate networks in different areas. It is a uniform code over the whole country.

The color code NCC is then used to discriminate cells that use the same frequency. Though mainly intended for the purpose of differentiating PLMNs, it also serves to distinguish cells within one PLMN that use the same frequency provided they have been



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assigned different NCC.

What is stated here should be considered as general guidelines. Of course any type of NCC assignment must be decided by agreements between operators and countries.

CGI

Range: MCC: 3 digits (Mobile Country Code).

MNC: 2 or 3 digits (Mobile Network Code).

LAC: 1 to 65535 (Location Area Code).

CI: 0 to 65535 (Cell Identity).

Unit -

Default: -

Description: Cell global identifier. CGI = MCC + MNC + LAC + CI. It should be noted that the classification of LAC has a significant effect on increasing signaling load and call completion rate.

Note: In Huawei system, LAC and CI should be in hexadecimal format.

CGI is sent to the mobile station (MS) as a part of the system information message (GSM Rec. 04.08). The combination MCC-MNC-LAC is also known as the location area identity (LAI).

Support GPRS

Description: Indicating whether the GPRS function is supported. It should be noted that the GPRS function needs the support of the base station.

Range: Yes, No

Unit

Default: No

Note: For base station versions that don't support the GPRS function and cells that do not provide the GPRS service, the value must be set to No. Otherwise, some mobiles cannot access to the network.

2.1.2 Frequency Hopping Data Table

Huawei’s GSM supports RF frame/baseband frame/timeslot hopping. The list is as follows:



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BTS series RF hopping

Baseband hopping

Timeslot hopping

Frame hopping

BCCH participating in baseband

hopping

BTS2X Y N N Y N

BTS3X Y Y Y Y Y

BTS22C Y N N Y N

BTS3001C (1TRX) N N N N N

BTS3001C (2TRX) Y N N Y N

BTS3002C Y N Y Y N

FH index No.

Range: 0–65535

Unit -

Default: -

Description: Internal index number providing an association between the radio channel configuration table and the frequency hopping data table.

Note: For data configuration when BCCH joins in baseband timeslot frequency hopping, please refer to the matching materials (Data configuration when BCCH is involved in frequency hopping).

MA

Range: -0−1023

Unit -

Default: -

Description: The MA is a set consisting of a maximum of 64 hopping frequencies. These frequencies must be those in the cell allocation table.

Note: MA is a set consisting of a maximum of 64 hopping frequencies. These frequencies must be those in the cell allocation table. MA of RF hopping cannot include the frequency of BCCH. But if BCCH participates in frequency hopping (baseband/timeslot FH), MA in other timeslots can include the BCCH frequency except the timeslot 0 of hopping TRX (when extended BCCH is configured, its’ corresponding timeslot should be excluded)

Frequency hopping algorithm:

If it is FH, calculate the frequency to be used by invoking FH algorithm as per hopping frequency set (Radio channel



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configuration table and Frequency hopping data table) in the channel property settings.

Judge whether it is baseband frequency hopping.

If it is baseband frequency hopping, find out the TRX NO to be used for the frequency calculated just now as per the correspondence between FH frequency and TRX NO (TRX configuration table).

So, the correspondence between hopping frequency and TRX NO in TRX configuration table is only used in base band frequency hopping.

While the correspondence between hopping frequency and TRX NO. is not suitable for RF hopping.

When use cyclic frequency hopping and DTX at the same time, the frequency number N cannot be the multiple of 13. Otherwise, most of the SACCH frames are sent and measured in the same frequency. This affects the accuracy of the measurement report carried by the SACCH frame in the active mode.

HSN

Range: 0–63, (HSN = 0 cyclic hopping sequence, HSN = 1 to 63 pseudo random) sequences. HSN should be the same for all the channels in one cell. MS can not access if HSN is greater than 63.

Unit -

Default: -

Description: Hopping sequence number, it should be consistent with the 64 types of FH sequence.

TSC

Range: 0–7.

Unit -

Default: -

Description: Training sequence code. In cells that use FH, TSC must be set to be the same as the BCC in the cell. Otherwise, the TCH channels cannot be properly occupied.



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Note:

For base band FH, the parameter “TRX Aiding Function Control” in the [cell configuration table] must be set to “Allowed & Recover When Check Res.” In the G3BSC32.10100.06.1120A and later version. If there is faulty TRX in FH group and the base band FH must be opened, the faulty TRXs must be removed from the FH group. When cycling FH and DTX are used together, the number of frequencies cannot be a multiple of the 13. Otherwise, most SACCH frame will be sent and measured on the same frequency, which affects the accuracy of the measurement reports contained in the SACCH.

2.1.3 Radio Channel Configuration Table

MAIO

Range: 0–N-1, N is the number of frequency in MA.

Unit -

Default: -

Description: Mobile Allocation Index Offset. In frame that uses FH, the same MAIO is recommended for all channels of a TRX and different MAIO for different TRX in the same cell. The primary policy is to guarantee that the MAIO of the same timeslot of different TRX that use the same HSN and MA in synchronized cells are not the same. This is to avoid the co-frequency collision. In timeslots that use FH, the MAIO of various channels of the same TRX can be configured differently.

CH type

Range: TCH full rate, TCH half rate 01, TCH half rate 0, SDCCH8, Main BCCH, Combined BCCH, BCH, BCCH+CBCH, SDCCH+CBCH, PBCCH+PDTCH, PCCCH+PDTCH, PDTCH, Dynamic PDTCH

Unit -

Default: When configure more than one SDCCH, divide the SDCCHs equally. The main BCCH TRX can’t configure more than 2 SDCCH. A TCH TRX can configure 2 SDCCH at most, and if in 16K mode and MR. Pre-process was disabled, one SDCCH can be configured at most. In the place where has much paging, think to not configure SDCCH on main BCCH TRX.

Description: Indicating the channel type and the function of each timeslot of all carriers in a cell. Every cell is configured with a BCCH carrier. Generally, the TRX ID of BCCH is fixed to be the smallest TRX ID in the cell. The ordinary channel combinations of BCCH carrier are



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as follows:

Combinations:

BCCH+7TCH

Main BCCH+SDCCH/8+6TCH

Main BCCH+2SDCCH/8+5TCH

Main BCCH+SDCCH/8+ extended BCCH(BCH)+5TCH

Main BCCH+SDCCH/8+ extended BCCH(BCH)+TCH+ extended BCCH(BCH)+3TCH

Note: 1) The configuration of BCCH in a cell should be done appropriately according to the channel number of the cell and the paging capability in a LAC.

2) The main BCCH and combined BCCH are configured in timeslot 0, and extended BCCH channel can be configured only in timeslots 2, 4, and 6. After extended BCCH channels are configured, the CCCH configuration parameters in the system information table should be configured accordingly. For example, if an extended BCCH is configured in timeslot 3) then in the system information table, CCCH should be configured into 2 non-combined CCCHs.

3) If the cell broadcast function is available, SDCCH+CBCH instead of SDCCH8 can be configured, or SDCCH+CBCH instead of a TCH can be configured. If the CBCH of SDCCH/4 is adopted, their channel type can be configured to be BCCH+CBCH.

4) For 1 to 2 TRX, one SDCCH/8 is configured; for 3 to 4 TRX, 2 SDCCH/8 s are configured; for 5 to 6 TRX, 3 SDCCH/8 s are configured. Meanwhile, the dynamic SDCCH allocation function should be enabled and work properly.

Half-rate networking possesses the following features different from other networking modes.

1, Half-rate mode, a channel configured as half-rate TCH includes two half-rate sub-channels and must occupy two trunk circuits. A channel configured as full-rate TCH includes only one full-rate channel and occupies one trunk circuit, but it must also be configured with two trunk circuits in order that the full-rate TCH can be converted dynamically into half-rate TCH. Before the adjustment, the latter trunk circuit is idle, and after the adjustment, both the trunk circuits are allocated to the two half-rate sub-channels. For other channels requiring trunk, they must also be configured with two trunk circuits, otherwise, all affected channels must be modified after channel type is modified dynamically.

2, In half-rate mode, multiplexing ratio of Abis interface LAPD signaling link can be up to 2:1 as RSL signaling flow of each TRX increases.

3, In half-rate mode, an E1 can support a maximum of 13 TRXs (less than 13 TRXs if LAPD signaling link does not support multiplexing.)

4, In half-rate mode, each BIE can support a maximum of 17 TRXs



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(less than 17 TRXs if LAPD signaling link does not support multiplexing.)

5, In half-rate mode, if BTS supports BIE crossover connection, the BIEs crossed over must be in half-rate networking mode.

6, In half-rate mode, 256 HW timeslots of the BS1 interface are numbered sequentially. Service channels are allocated in the order of from the timeslot 0 to the timeslot 255. While OML and RSL are allocated in the order of from the timeslot 255 to the timeslot 0.

7, For a BIE group configured as half-rate networking mode, all BTS data must be modified based on this rule.

8, In half-rate data configuration, 34BIE and 13FTC (HR version)/14FTC must be used. Otherwise, either 32BIE or 34BIE can be used as BIE, and either 12FTC or 13FTC can be used as FTC.

2.2 Site

2.2.1 Carrier Configuration Table

Static TRX Power class

Range: 0–13

BTS versions:

BTS3X support the static power setting of levels 0–10.

BTS2X support the static power setting of levels 0–10.

BTS22C support the static power setting of levels 0–13.



Unit -

Default: 0

Description: Power class "0" shows that power is in its maximum. Each class is 2 dB less than its former class.

Note: Cells can be enabled to sufficiently carry traffic by setting the "power class" parameter. If antennas are so high that they result in serious cross-cell overlapping, the primary solution is to lower the antenna height and increase the antenna downtilt. Reducing the BTS power output will deteriorate indoor coverage.

The ARFCNs must be the subset of the CA.

Generally, for cells with the same priority in the network, their power class setting should guarantee that the EIRP of every cell is



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basically the same.

During power class setting, it should be noted that different combining modes might result in the different power losses.

If FH is not enabled, only the first one among all ARFCNs in the carrier configuration table is valid.

BSC06.1120 and later version can support EGSM/RGM band.

Carrier power type

Range: 40 W, 60 W,Default

Unit -

Default: Default

Description: Used to configure the carrier type, which is used to distinguish carriers with different powers.

HW-IUO property

Description: Indicating whether TRX should be configured as OverLaid or UnderLaid subcell.

Range: OverLaid subcell, UnderLaid subcell, None

Unit -

Default: -

Note: In the cell with single TRX but dual timeslot, the HW-IUO property of the TRX shall be configured as OverLaid.

TRX priority

Description: The priority of TRX (valid in HW_II channel allocation algorithm only.).

Range: Level 0–Level 7

Unit -

Default: Level 0

2.2.2 Antenna and Feeder Configuration Table

Tower-mounted amplifier flag

Range: With tower-mounted amplifier, Without tower-mounted amplifier

Unit -



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Default: -

Description: Weather to use Tower-mounted amplifier.

Power attenuation factor

Range: 0–255

Unit -

Default: The configuration depends on the feeder cable length. Configuration methods are as follows:

The BTS2.x adopts non-CDU mode; this parameter is fixed as 10.

In the case that BTS (including 2.0 and 3.0 base stations) adopts CDU, CDU gain should be adjusted according to the two parameters described above.

Uplink: according to whether the tower-mounted amplifier is used:

Description: Use to compensate the amplifier’s gain.

Tower-mounted amplifier flag Power attenuation factor Description

With tower-mounted amplifier

Tower-mounted amplifier gain –feeder cable loss = 12 – 4 = 8 dB

Triplex tower amplifier gain: 12.

Duplex tower amplifier gain: 14

Simplex tower amplifier gain: 14

Assuming that feeder loss: 4dB

Without tower-mounted amplifier

0

Downlink: Without tower-mounted amplifier, power attenuation factor is set to be 255.

2.3 Cells

2.3.1 System Information Table

System information

Range: 1–12. 2bis, 2ter, 5bis, 5ter, 10bis



2-12

Unit -

Default: 1–6. 2bis, 2ter, 5bis, 5ter

Description: Use to determine whether to use a certain type of system information. The system information is broadcasted from BTS to MS. The system information informs all MS of the cell the information about LAC, CGI, CA, available HSN, channel allocation and random access control. This helps MS to locate network resources quickly and accurately. 2bis and 5bis are used for the 1800 network, and 2ter and 5ter are used for the 900/1800 dual-band network. For detailed system information definitions, please refer to Protocol 0408 and system information training materials.

Regular transmission

Range: Yes, No

Unit -

Default: Yes

Description: Indicating whether BSC regularly updates the system information sent by BTS. If it is set as "Yes", BSC updates the system information being sent by BTS every interval (the interval is determined by regular transmission interval).

Regular transmission interval

Range: 0–255

Unit -

Default: 10

Description: The interval for BSC to retransmit system information to BTS.

MS MAX retrans

Range: 1, 2, 4, 7

Unit times

Default: -

Description: The maximum times for MS being allowed to send the "Channel Request" message during one immediate assignment process. After the immediate assignment process starts, MS will keep monitoring BCCH and CCCH information. If the MS does not receive an Immediate Assignment or Immediate Assignment Extend command, MS will keep retransmit ting the channel request message at every certain interval. The greater is this parameter, the higher the call attempt success rate, the higher call completion rate and the greater the load on RACH and SDCCH. See Protocol 0408.



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Note: 1) The bad downlink quality might cause an MS to send SABM message to BTS multiple times.

2) For areas where the cell radius is more than 3 kilometers and there is a less traffic (normally the suburb or rural areas), M can be set as 11 (i.e., the maximum retransmission times is 3) so as to raise MS access success rate

3) For areas where the cell radius is less than 3 kilometers and there is an average traffic (generally, it refers to the less busy urban areas), M can be set as 10 (i.e., the maximum retransmission times is

4) For microcell areas and obviously congested cells with a large traffic, M is recommended to be set as 00 (i.e., the maximum retransmission times is 1).

5) For satellite transmission BTS, M is recommended to set to be equal to or greater than 4.

Common access control class

Range: Level 0–9 forbidden

Unit -

Default: 000000000

Description: Use to control load and to permit or forbid the network access of users at certain common access levels.

Defines which access classes that are barred. Up to 16 access classes can be defined.

Class 10 defines emergency call in the cell.

0 to 9 Access classes that are barred.

10 Emergency call not allowed for MSs belonging to classes 0 to 9.

It may be of interest to the operator to bar the access to the system to a certain type of MS. For this purpose it is possible to define up to 16 different access classes of MSs and then select the classes that can not access a cell by means of ACC (GSM 04.08, section 10.5.2.17).

The classes are defined according to GSM 02.11. Classes 0 to 9 are reserved for the operator to be used for normal subscribers (home and visiting subscribers).

Special access control class

Range: Level 11–15 forbidden

Unit -

Default: 00000



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Description: Use to control load and to permit or forbid the network access of users at certain special access levels.

Classes 11 to 15 are defined as follows:

11 PLMN use.

12 Security Services.

13 Public utilities.

14 Emergency services.

15 PLMN staff.

Cell channel description format

Range: Bitmap, 1024, 512, 256, 128, Variable-length

Unit -

Default: Bitmap

Description: The message element is a list of available absolute carrier numbers in a serving cell. Its length is 17 bytes. To be specific, from the D3 bit of the second byte in the cell channel description to the D0 bit in the 17th byte, there are totally 124 bits, recorded respectively as carriers No. 124, 123, 122.3, 2, and 1. If the Nth bit is 1, then this Nth carrier belongs to this cell.

ATT

Range: Yes, No

Unit -

Default: Yes

Description: Attach-detach allowed. ATT tells the MS if it is allowed to apply IMSI attach and detach, i.e. if the MS is allowed to send a message to the system every time it is turned on or off (GSM 04.08, section 10.5.2.11). For different cells in the same LAC, their ATTs must be set to be the same.

PWRC

Range: Yes, No

Unit -

Default: Yes

Description: If BCCH carrier timeslots participate in frequency hopping, PWRC indicate whether MS should remove the receiving level from BCCH carrier timeslots when it calculates the average receiving level

Both MS and BTS must possess measurement function so as to monitor RL communication quality and perform power control. But



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the measurement may result in some problems when several independent GSM functions works together. First, it is allowed by GSM recommendations that hopping channel uses the BCCH frequency (but not in the timeslot transmitting BCCH). Second, downlink power control is allowed in the frequency hopping channel. Third, power of the TRX involving BCCH can not change since MS must measure the signal level of the neighboring cell. Therefore, downlink power control is feasible only for a frequency sub-set of this channel. That is, it excludes BCCH TRX used in frequency hopping by this channel. If MS measures the average downlink channel level in the common way, the measurement result is incorrect for power control. So MS should remove the receiving level from BCCH carrier timeslots when it calculates the average receiving level during frequency hopping.

UL DTX

Range: Allowed, Mandatory, Forbidden

Unit -

Default: Mandatory

Description: Uplink DTX, Indicates whether the discontinuous uplink transmission of MS is enabled in the last measuring period. See Protocol 0508.

Note: Huawei GSM supports whether to enable the downlink DTX function in BSC. For parameter setting, please refer to "Whether to use downlink DTX" in the cell attribute table.

CBA

Range: Yes (1), No (0)

Unit -

Default: Yes

Description: Cell Bar Access. See Protocol 0408. It can be used together with CBQ to determine the priority of cells.

It is possible to use CBA to bar a cell (GSM 03.22 and 05.08). When a cell is barred it is ignored by MSs in idle mode but an active MS can perform handover to it.

Note: Host provides a reverse calculation. If OMC is configured as yes (1), CBA transmitted to MS is still yes (0), which complies with the protocol.

”yes” and no” are used In data configuration (either data configuration system or auto configuration system). “0” and “1” are only set in the program.

CBQ



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Unit -

Default: No

Description: Cell Bar Qualify. See Protocol 0408. It can be used together with CBA to determine the priority of cells.

For GSM phase 2 MSs, a cell can be given two levels of priority. This is controlled by the parameter CBQ in conjunction with CBA, as shown in below table.

The interpretation of CBA and CBQ varies depending on whether the MS is a phase 1 MS or a phase 2 MS. For phase 2 MSs the behavior is also different in cell selection compared to cell reselection.

In idle mode the MS looks for suitable cells to camp on by checking cells in descending order of received signal strength. If a suitable cell is found, the MS camps on it. At cell selection

With a phase 2 MS, cells can have two levels of priority, suitable cells which are of low priority are only camped on if there are no other suitable cells of normal priority (GSM 03.22).

CBQ CBA Cell selection priority Cell reselect priority

No(0) Yes(1) Normal Normal

No(0) No(0) Barred Barred

Yes(1) Yes(1) Low Normal

Yes(1) No(0) Low Normal

Note: The value of CBA and CBQ can affect the MS access to the system. The above table is for Phase2 MS

EC allowed

Range: Yes, No

Unit -

Default: Yes

Description: Emergency call allowed. For the MS at access level 0–9, the "Yes" of this parameter indicates that emergency call is allowed; for MS at access level 11–15, only when both the corresponding access control class and this parameter are set to “Yes” then emergency call be forbidden.

Call re-establishment allowed



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Range: Yes, No

Unit -

Default: Yes

Description: Whether to allow call re-establishment. For the radio link disconnection caused by unexpected interference or coverage of "blind spot", MS can start the call re-establishment process to recover the conversation. The call re-establishment takes long time, the subscriber usually cannot wait and hang up the call. Therefore, It is recommended not to allow the call re-establishment.

NCC permitted

Range: 0 allowed–7 allowed

Unit -

Default: 1111111

Description: Network color code permitted. The value 1 stands for permitted and 0 for forbidden. This parameter is sent in system information 2 and 6. When the cell’s NCC is consistent with the value of NCC permitted, then this cell will be measured by MS. And MS will report the measurement report to BTS. This parameter consists of one byte (8bit). Each bit is corresponding to an NCC (0–7) and the last bit is corresponding to NCC 0. If bit N is 0, then MS will not measure the cell level with NCC being N.

Note: As MS cannot report the neighboring cell information where NCC is set to 0, the incorrect setting of this parameter will cause MS to be unable to hand over during conversation. See Protocol 0508.

This parameter can be used to make MS‘s measurements on some neighboring cells optionally.

CCCH-CONF

Range: 1 combined CCCH, 1 non-combined CCCH, 2 non-combined CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs.

Unit -

Default: non-combined CCCH

Description: CCCH configuration.

Note: 1) Non-combined CCCH, 1 combined CCCH, 2 non-combined CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs. In a corresponding BCCH multi frame, numbers of CCCH message blocks are: 9, 3, 18, 27, and 36. CCCH configuration determines the capacity of PCH, AGCH, and RACH. Generally, the PCH capacity of every cell in a LAC should be consistent.

2) For the cell with one carrier, it is recommended to configure 1 combined CCCH. For the cells of other configurations, determine the CCCH configuration as according to the carrier number. For



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extended BCCH (including the main B and expanded BCCH), the number of BCCH channels configured is equivalent to the number of non-combined CCCHs configured.

1, BS_AG_BLKS_RES and CCCH configuration parameters will be adjusted dynamically as per main BCCH channel 0 configuration types.

2, If CCCH is not configured as “1 combined CCCH”, the Access granted blocks reserved change into 2 by default, and the value of the parameter ranges from 1 to 7. If CCCH is configured as “1 combined CCCH”, the Access granted blocks reserved in the corresponding system message change into 1 by default, and the value of the parameter ranges from 1 to 2.

3, If main BCCH channel 0 is configured as “combined BCCH" or “BCCH + CBCH”, the corresponding CCCH parameter in the system message list is configured as “1 combined CCCH”.

4, If main BCCH channel 0 is configured as “main BCCH", the corresponding CCCH parameter in the system message list is configured as “N non- combined CCCH”. N is the total number of channel 0, 2, 4, 6 that are configuration as “main BCCH” and “BCH”.

Tx-integer

Range: 3–12, 14, 16, 20, 25, 32, 50

Unit RACH timeslot (equals to a TDMA frame, 4.615ms)

Default: 20

Description: Use to determine the timeslot number of the interval between two continuous requests when MS continuously sends multiple channel requests. The purpose of this parameter is to reduce the number of collisions on RACH which mainly affects the execution efficiency of immediate assignment process. Tx-integer and the CCCH configuration jointly determine the parameter S, as shown in the following table.

S Tx-integer

non combined CCCH combined CCCH / SDCCH

3. 8. 14. 50 55 41

4. 9. 16 76 52

5. 10. 20 109 58

6. 11. 25 163 86

7. 12. 32 217 115



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Description: The timeslot number that MS used for sending the first channel request message is a random value in the set of {0, 1… MAX (T, 8)-1}.

The timeslot number for the interval between any two adjacent channel request messages (excluding the timeslots sending the message) is a random value in the set of {S, S+1… S+T-1}. The greater the Tx-integer, the greater the range for the interval of MS to send channel request messages, and the lesser the RACH collisions. The greater the S value, the greater the interval for MS to continuously send channel request messages, and the lesser the chance of collisions on the RACH channel, and the higher the availability rate of AGCH and SDCCH channels. But the increase of T and S will increase MS access duration, which leads to drop in the access performance of the whole network. Generally, it should be guaranteed that that no overloading occurs on the AGCH and SDCCH channels and the S should be as small as possible.

Example

If the cell has a non combined CCCH and TX = 7 then the

interval between each retransmission may be

1 second (217 RACH slots),

1 sec. + 4.615 ms,

1 sec. + 2*4.615 ms,

…

1 sec. + 6*4.615 ms.

Note: In case of large traffic, the smaller the S+T value the lower the immediate assignment success rate. In this case, we can adjust the T value so that S+T is greater.

In the case of satellite transmission, this value should be 32 so as to reduce impact of satellite transmission delay.

BS_AG_BLKS_RES

Range: 0–7 (non-combined BCCH), 0–2 (1 combined CCCH),

Unit Block

Default: 2 (non-combined CCCH), 1 (combined CCCH)

Description: Number of CCCH blocks reserved for the access grant channel. The remaining CCCH blocks are used for the paging channel.

In each downlink non-combined SDCCH 51 frames multi-frame there are 9 different CCCH blocks and in the combined BCCH/SDCCH there are 3 different blocks. They can be used to:

Send paging messages, i.e. used as a Paging Channel.

Send access granted messages, i.e. used as an Access Grant Channel.



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After an MS tunes to the BCCH/CCCH channel and decodes the System Information, it performs an evaluation that, taking into account the MS's own IMSI (International Mobile Station Identity) number, determines to which particular CCCH block in the physical channel it should listen (GSM 05.02). Every CCCH in the physical channel (Paging Sub-channel) sends paging messages to a certain group of MSs that are called its paging group. The reason for the existence of such paging groups is that the MSs can save batteries because it only needs to listen to its own Paging Subchannel messages.

The physical channel (Paging Subchannel) sends paging messages to a certain group of MSs. As mentioned before these very same CCCH blocks are also used to send Access Grant messages to the MSs, i.e. to answer a Random Access message that an MS wanting to access the system has sent to the system.

The structure of the CCCH regarding Paging messages and Access Grant messages can be controlled by the two parameters: BS_AG_BLKS_RES and BS-PA-MFRAMS, and the setting of this parameter will impact on the MS paging response time and the system service performance.

Note: It is specified in the protocol that the reserved AGCH blocks can not be 0 in the following cases:

1) There is system message to be transmitted on Extended BCH.

2) There has been configured with CBCH channel.

3) There has been configured with NCH channel in the case of GSMR.

BS-PA-MFRAMS

Range: 2–9

Unit CCCH multi-frames

Default: For the area with ordinary or heavy load on paging sub-channel (the area with medium or high traffic volume in the location area), set MFR to 6 or 7 (make 6 or 7 multi-frames as a paging group).

For the area with low load on paging sub-channel (the area with low traffic volume in the location area), set MFR to 4 or 5 (make 4 or 5 multi-frames as a paging group). Usually, set MFR to 2.

Description: Paging Multi-frames period. Defines period of transmission for PAGING REQUEST messages to the same paging subgroup.

Together with BS_AG_BLKS_RES, BS-PA-MFRAMS determines the number of paging groups.

MFRMS is also used by the MS to determine downlink signaling failure in idle mode (GSM 05.08). The downlink signaling failure criterion is based on the downlink signaling failure counter DSC. When the MS camps on a cell, DSC shall be initialized to a value equal to the nearest integer to 90/N, where N is the BS-PA-MFRAMS parameter for that cell. Thereafter, whenever the



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MS attempts to decode a message in its paging subchannel; if a message is successfully decoded DSC is increased by 1, (however never beyond the nearest integer to 90/N), otherwise DSC is decreased by 4. When DSC reaches 0, a downlink signaling failure shall be declared. A downlink signaling failure shall result in cell reselection.

Note: 1) A paging block (four continuous CCCH timeslots) can bear 2 IMSI paging or 4 TMSI paging or an AGCH immediate assignment message.

2) The DL signaling channel is faulty in idle mode.

The DL fault principle is based on the DL signaling fault counter DSC. While the MS remains in a cell, DSC is initiated to the nearest number of 90/NodeB where N is BS_PA_MFRMS (the number of frames with same paging) with the range of 2~9.

So, DSC is incremented by 1 when the MS successfully decodes a message on its paging sub-channel. But DSC should not exceed its initial value. If the decoding fails, DSC is decremented by 4. If DSC <= 0, a DL signaling channel fault occurs. The DL signaling channel fault causes a cell reselection.

3) Different settings for different types of base station.

If there is a BTS2X in the location area and the setting of this parameter is too small, the CCCH will be over-loaded. It is recommended to set the parameter to 5 or 6 in this case.

T3212

Range: 0–255

Unit 6 minutes

Default: 20~30 (urban), 10~20 (suburb), 8~10 (mountains)

It is advised to select a greater value for T3212 (i.e. 16h, 20h, 25h, etc.) in the area with large traffic, while a smaller value for T3212 (i.e. 3, 2 etc.) in the area with small traffic. In order to assign T3212 with a proper value, it is necessary to perform overall and long term measurement on the objects in the running network in respect of their processing ability and traffic on them (processing ability of MSC and BSC, the load of A-interface, Abis interface, Um interface, HLR and VLR). T3212 can be assigned with a greater value once overload occurs to any object. Time limits of periodical location updating in VLR/BSC can be used flexibly to improve system connection rate, increase LAC capacity while decreasing ineffective calls.

Description: The periodical location updating timer. In VLR, there is another parameter called the periodical location updating timer. The shorter the periodical location updating time, the better the overall network service performance. But, the greater network signaling load will lower the radio resources availability rate. In addition, this will increase the MS power consumption, so that the MS average standby time is greatly shortened. Consider the processing ability of MSC and BSC, the load of A-interface, Abis interface, Um



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interface, HLR and VLR before setting this parameter. Generally, the larger value should be set for the continuous coverage of urban area and the smaller value for suburbs, rural, or blind spots.

Note: 1) In MSC, the periodical location updating timer must be greater than the value of BSC.

2) Due to the periodical location update principle of the GSM system, sometimes even the MS is on but no location update request is sent for a long period, it will be identified as implicit off-line. When the MS cell is reselected to another cell (in the same location area), if the T3212 of the new cell is different from that of the old cell, it will be restarted by the T3212 timeout value. If the values of this parameter are different for the cells in the same location area, the MS may not be able to initiate a location update process for a long period under some situations. In this case, the MS will be identified as “implicit off-line”. The MS will receive a voice recording of “The phone you are calling is off line”

The parameter value of different cells that share the same LAC, must be the same.

Radio Link Timeout

Range: 4–64, with a step-length of 4

Unit SACCH period (480ms)

Default: Area with very little traffic (remote area): 52~64

Area with less traffic or large coverage (suburbs or rural area): 36~48

Area with large traffic (urban area): 20~32

Area with very large traffic (covered by micro cells): 4~16

For those cells with blind points or the area in which the traffic is interrupted very often, increase the value of this parameter to help resuming the communication.

Description: See Protocol 0408 and 0508. MS uses this parameter to determine when to disconnect the connection when SACCH decoding fails. Once MS is assigned with SDCCH, it starts the timer S with its initial value being this parameter. S decrements by 1 every time when an SACCH decoding fails and S increments by 2 every time when a SACCH decoding succeeds. If S = 0, it indicates the DL radio link is faulty. Thus, the release or re-establishment of connection is guaranteed to be performed on those connections whose quality level has deteriorated to an intolerable level. But if the parameter is too small, it will cause call-drop due to radio link faults. While when it is too large, MS will not release the resource in a long time, thus lowering the resources availability rate (this parameter works for the downlink only).

MS_TXPWR_MAX_CCH



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Range: 0~31

For cells of GSM900 and GSM1800, the corresponding dBm value varies with the control level.

For GSM900, the 32 maximum transmission power control levels are: {39,39,39,37,35,33,31,29,27,25,23,21,19,17,15,13,11,9,7,5,5,5,5,5,5,5,5,5,5,5,5,5}

For GSM900, the 32 maximum transmission power control levels are: {30,28,26,24,22,20,18,16,14,12,10,8,6,4,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,36,34,32}

Unit grade

Default: 5(900M), 0(1800M)

Description: The maximum MS transmitting power level. This parameter is sent in the BCCH system information. It affects MS behavior in the idle mode and is used to calculate C1 and C2 values so as to determine cell selection and cell reselection.

Note: The maximum MS transmitting power level. It is sent in the system message of BCCH to affect the MS behavior in idle mode. It is also used to calculate the values of C1 and C2 to determine the cell selection and reselection.

C1 = RLA_C – RXLEV_ACCESS_MIN - MAX ( ( MS_TXPWR_MAX_CCH –P), 0) where RLA_C is the average MS receiving level, RXLEV_ACCESS_MIN is the minimum receiving level for the MS accessing the network, MS_TXPWR_MAX_CCH is the maximum transmitting power level of the control channel for the MS and P is the maximum transmitting power level of the MS.

This parameter determines the output power level adopted by an MS when it has not received the power control command. See Protocol 0508. The smaller this parameter, the greater the MS output power. MS near BTS will cause great side-channel interference to this cell, and affect the access and conversation quality of other MS. The greater this parameter, the less the MS output power, and this will lower the access success rate of MS at the edge of the cell.

RXLEV_ACCESS_MIN

Range: 0–63, (-110 dBm–-47 dBm)

Unit Grade

Default: 8

Description: Minimum MS received signal level. See Protocol 0508. It indicates the minimum receiving signal level required for MS to access the system.

Note: If this parameter is too small, it will cause MS to access network



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easily. Meanwhile, the cell load and call-drop possibility will be increased. Therefore, consideration should be given to the balance between uplink and downlink.

Half rate supported

Range: Yes, No

Unit -

Default: No

Description: Used in network to inform MS whether the system supports half rate.

Huawei provides two schemes of channel rate allocation: “MSC controlled channel rate allocation” and “BSC controlled channel rate allocation”. Which one will be adopted depends on BTS 0 of [Call parameter II] in Software Parameter Table of OMC data configuration system.

[Call parameter II] BIT 0

Range: 0 and 1

Description:

”0”: MSC required rate allocation is used. That is, allocate half-rate TCH or full rate TCH as per MSC requirements.

”1”: BSC required rate allocation is used. That is, BSC decides whether to allocate half-rate TCH or full rate TCH first as per the current traffic etc.

Default value: 1.

MSC controlled channel rate allocation.

MSC radio channel allocation scheme. If the type of the channel for allocation by MSC is “only full rate” or “only half-rate”, only the channels of complete matched rate can be allocated. If the type of the channel for allocation is “preferred full rate”, all the channels with full rate TCH will be allocated only if they meet the corresponding conditions. If the type of the channel for allocation is “preferred half rate”, all the channels with half rate TCH will be allocated only if they meet the corresponding conditions.

In order to allocate channels completely following MSC’s assignment during A interface interconnection test, we still adopt the single MSC radio channel allocation scheme, although it is hard to achieve the most satisfactory network capacity and voice quality by this channel allocation scheme.

BSC controlled channel rate allocation.

An improvement of MSC controlled channel rate allocation. If the type of the channel for allocation by MSC is “only full rate” or “only half-rate”, only the channels of complete matched rate can be allocated. If the type of the channel for allocation is “preferred full rate” or “preferred half rate”, the full rate TCHs will be allocated first



2-25

to ensure the conversation quality if there are many idle full rate TCHs, while the half-rate TCHs will be allocated first to ensure the network capacity if there are a few of idle full rate TCHs.

In detail, if the Number of idle full rate TCHs > Threshold (configured in OMC data configuration system) of preferred idle full rate TCHs, the full rate TCHs will be allocated first. If the Number of idle full rate TCHs < Threshold (configured in OMC data configuration system) of preferred idle full rate TCHs, the half rate TCHs will be allocated first.

CRH

Range: 0–14

Unit 2 dB

Default: 4

Description: Cell Selection Hysteresis, used for cell reselection between different LAC.

Each change of location area requires a location update to be performed, which increases signaling load. In order to prevent Ping-Pong effects for cell selection across location area borders, a hysteresis, defined by CRH, is used.

The purpose of this parameter is to avoid frequent location updating. The greater this parameter value, the more difficult the cell reselection between different LAC.

CBCH CH Description

Range: -

Unit -

Default: -

Description: CBCH channel description.

It only appears when short message cell broadcast comes into service. As an option of the system message 4, it consists of 6 bytes. The first byte is channel description. The second byte includes channel type, TDMA offset and TN (timeslot No.). The third and fourth bytes include MAIO (high bit) when H=1 (frequency hopping), ARFCN (high bit) when H=0 (no frequency hopping) and TSC information. 4, It includes MAIO (low bit) and HSN information. 5, It includes low bit of ARFCN.

CBCH mobile allocation

Range: -

Unit -

Default: -



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Description: If FH is used in CBCH channel description, then this parameter must be set. If the No.1 bit of the value is "1", it indicates that the No.1 frequency in the CA list belongs to the MA list.

ACS

Range: Yes, No

Unit -

Default: No

Description: Additional reselection parameter indication, used to inform MS where to get the related cell reselection parameter during cell reselection. In the case of ACS=0, it is meaningless in system information 3; while it is valid in system information 4, MS should get the PI and the related parameters involving in the calculation of C2. In the case of ACS=1, MS should get the PI and the related parameters involving in the calculation of C2 from the system information 7 and 8.

PI


Unit -

Default: Yes

Description: Cell reselection parameter indication, sent on the broadcast channel. It is used to determine whether CRO, TO, and PT are used. In fact, it informs MS whether to adopt C2 for the cell reselection. See Protocol 0408 and 0508. The cell reselection caused by parameter C2 has an interval of at least 5 second so as to avoid frequent MS activation of the cell reselection process.

Note: The MS will calculate C1 and C2 of the serving cell at a minimum of every 5 seconds. When necessary, it will re-calculate C1 and C2 value of all non-serving cells (neighboring cells). The MS constantly checks the following conditions:

Whether the path loss (C1) of the current serving cell drops below 0 within 5 s. If yes, it shows too much path loss of this cell.

The C2 value of a suitable non-serving cell always exceeds that of serving cells in 5 s, and meets the following conditions:

1) If a new cell is in a different location area, the C2 value of this new cell minus CRH (from the system information of the serving cell) constantly exceeds the C2 value of the serving cell for 5 s period.

2) If a cell reselection has occurred within the last 15 s, then the C2 value of the new cell minus 5 dB constantly exceeds the C2 value of the serving cell for 5 s period.

A new cell that meets the conditions above is a better cell. When a better cell exists, the MS will have cell reselection. Cell reselection



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will not occur within 5 s after the last reselection.

CRO

Range: 0–63. Corresponding level value: 0–126db.

Unit 2 dB

Default: 0

Description: Cell reselection offset. It indicates the C2 value can be corrected manually. See Protocol 0508 and 0408. This parameter affects only GSM Phase II MS.

Note: The setting of RXLEV-ACCESS-MIN and CRO should guarantee that cells with same priority have the same cell reselect offset. Otherwise, something abnormal will occur.

TO

Range: 0–7. The corresponding value: 0–60db and 7 corresponds to "infinite"

Unit -

Default: 0

Description: Cell reselection temporary offset, indicating the temporary correction value of C2. It works only during the "cell reselection penalty time" period. See Protocol 0508 and 0408. This parameter affects only the GSM Phase II MS.

PT

Range: 1．0–31. The corresponding time is 20–620s, 31 is a reserve value used to change the effect of the CRO on C2.

Unit -

Default: 0

Description: Cell reselection penalty time, a parameter to ensure the safety and validity of cell reselection Its main function is to avoid too frequent MS cell reselection. See Protocol 0508 and 0408. This parameter affects only the GSM Phase II MS.

Note: After the MS completes cell selection, the MS in idle mode starts the cell reselection process to select a better serving cell. It is C2 that determines cell reselection. The principle of MS reselection is to select the cell with the maximum C2 value as compared with the serving cell. C2 calculation is as follows:

1. When the ENALTY_TIME is not 11111,C2 =C1+CELL_RESELECT_OFFSET–TEMPORARY_OFFSET×H (PENALTY_TIME–T)

Where,



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If x<0, H(x) =0 ; If x_0, H(x) =1.

T is the timer, started from zero at the point at which the cell was placed by the MS on the list of strongest carriers. T is reset to zero whenever the cell is no longer on the list of strongest carriers. The precision of T is one TDMA frame (about 4.62ms). When this cell is out of the six cell tables, the timer T is reset.

Special remarks: when the cell reselection occurs in a serving cell, the original serving cell becomes the neighbor cell of the new serving cell. The T of the original serving cell becomes the initial value of PENALTY_TIME (parameter of original cell). If PENALTY_TIME–T<0, that is C2=C1+CRO, then do not implement the time penalty on the original cell.6

2. If PENALTY_TIME is 11111, then C2=C1–CELL_RESELECT_OFFSET

.CELL_RESELECT_OFFSET is used to modify the cell reselection parameter C2 manually.

This shows that C1 reflects the radio channel quality. The greater the C1, the better the channel quality. But the C2 value is manually corrected and can be adjusted by CRO. Thus, the C2 value can be calculated accordingly to CRO, TO, and PT so as to reselect the serving cell. For example, we can set CRO so that the C2 value of GSM1800 is greater than that in GSM900. Thus, even in cases that the signal strength in the GSM1800 cell is lower than that in GSM900, MS still can reselect GSM1800 cells as serving cell.

ECSC

Range: Yes, No

Unit -

Default: No

Description: Early Classmark Sending Control. Indicates if an MS in the cell is allowed to use early Classmark sending. See Protocol 0408.

After receiving the class mark change message, MS will send additional Classmark message to the network as soon as possible. CM3 (Classmark 3) message includes the information about MS power, multiband and/or multislot capability. To perform handover between different bands, the power level must be described correctly. In the process of paging and sending of the BA2 information between different bands, the CM3 message must be known.

Note: 1) ECSC is invalid for single-band MS. For dual-band MS, when ECSC is not used, after the MS sends EST IND, MSC will still send the CLASSMARK REQUEST message, and MS will response with the CLASSMARK UPDATE message, and other functions are not affected. For the dual-band MS, when this parameter is set to No, the connection time between different MS will be obviously shortened.

2) When the encryption function is enabled, The parameter must be



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set to “Yes”.

3) M900/M1800 hybrid cells sharing BCCH are advised to be configured as “yes”, and M1800 cells in dual-band network are advised to be configured as :yes”. When adopt A5/4~7 encryption algorithm, it is advised to be configured as “yes”.

Power deviation indication

Range: Yes, No

Unit -

Default: No

Description: Determines whether to calculate the power deviation of CM3 MS of DCS1800.

Power deviation

Range: 0–3. The corresponding values: 0db. 2db. 4db. 6dB

Unit -

Default: 1

Description: After accessing on RACH, if CM3 MS of DCS1800 does not receive the original power control command, its power output = the maximum MS transmitting power level + the power deviation. See Protocol 0508.

MBR

Range: 0–3

Unit -

Default: 0

Description: Multiband reporting. Used to inform MS to report the information about neighboring cells of multiband and this report is sent in system information 2ter and 5ter.

No matter which band they belong to, when its value is "0", MS reports MRs of 6 strongest neighboring cells whose NCC is known and allowed.

When its value is "1", MS reports MR of a neighboring cell, which has the strongest signal and whose NCC is known and allowed in each band (excluding the band of the current serving cell). The rest the MRs belong to the neighboring cells of the current band.

When its value is "2", MS reports MR of two neighboring cells, which have the strongest signal and whose NCC is known and allowed in each band (excluding the band of the current serving cell). The rest the MRs belong to the neighboring cells of the current band.



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When its value is "3", MS reports MR of three neighboring cells , which have the strongest signal and whose NCC is known and allowed in each band (excluding the band of the current serving cell). The rest the MRs belong to the neighboring cells of the current band. See Protocol 0508. When the traffic of each band is basically the same and there is no special requirement on the band, this parameter is set to "0". When the traffic of each band is obviously different and MS is expected to preferably accessing to a certain band, this parameter is set to "3". In other cases, it is set to "1" or "2".

2.3.2 Cell Configuration Table

Data service allowed

Range: NT14.5 K, NT 12 K, NT 6 K, T 14.4 K, T 9.6 K, T 4.8 K, T 2.4 K, T 1.2 K, T 600BITS, T 1200/75

Unit -

Default: 0110111000

Description: Indicates which data service is supported. The value "0100000000" indicates only the NT 12 K data service is supported. The specific value should be set according to the actual situation.

Encryption algorithm

Range: Not supporting encryption, A5/1–A5/7

Unit -

Default: 10000000

Description: Determines which encryption algorithm is used. This parameter should not be composed of all 0s. "10000000" indicates that the encryption is not used.

Note: Encryption algorithm should be consistent between the BSS and the NSS. It should be first described in MAP functional flow of MSC that whether the system needs to encrypt and which encryption algorithm the system uses. The final selection of encryption algorithm is determined by BSC data configuration and the MS capability.

TRX Aiding Function Control

Range: TRX Aiding Not Allowed; Allowed, Recover Forbidden; Allowed, Recover Immediately; Allowed, Recover When Check Res

Unit -

Default: Allowed, Recover When Check Res



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Description: TRX Aiding Not Allowed: TRX aiding is not allowed. That is, the TRX aiding function is closed. Allowed, Recover Forbidden: TRX aiding is allowed. However, after the fault TRX is restored, TRX recovery is forbidden. Allowed, Recover Immediately: TRX aiding is allowed. After the fault TRX is restored, it can be recovered immediately. Allowed, Recover When Check Res: TRX aiding is allowed. After the fault TRX is restored, it will not be recovered immediately but recovered during resource check at 3:00 am.

1, BCCH mutual aiding: Switch the main BCCH to another normal TRX.

2, BCCH mutual aiding change back: When the faulty BCCH TRX recovers, the main BCCH switches back to the original TRX recovered.

3, Baseband frequency hopping mutual aiding: It takes place when the TRX in a cell participating in baseband frequency hopping is faulty, or BCCH mutual aiding occurs. In this case, the cell will be initialized as “no frequency hopping cell”.

4, Baseband frequency hopping mutual aiding change back: It takes place when all TRXs in a cell participating in baseband frequency hopping recovers to normal and the original BCCH TRX is also normal. In this case, the cell recovers to baseband frequency hopping mode,

5, The cell will be initialized only if TRX mutual aiding or change back (BCCH mutual aiding or baseband frequency hopping mutual aiding) occurs.

6, For any types of BTSs, no mutual-aiding will occur 15 minutes after the cell is initialized.

FH mode

Range: Not FH, baseband FH, RF FH

Unit -

Default: Not FH

Description: Determines whether the frequency hopping is used and which frequency hopping mode is used.

Note: BTS2X supports RF frame frequency hopping, BTS3X (all versions) supports baseband frequency hopping and RF frequency hopping, including timeslot frequency hopping and frame hopping.

SMCBC DRX

Range: Yes, No

Unit -

Default: No



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Description: Short message of cell broadcast DRX mode. See the related materials on the cell broadcast. Here, DRX means SMBCB DRX MODE (cell broadcast short message discontinuous receiving mode). BSC supporting SMBCB DRX must send scheduling message for MS to receive cell broadcast messages discontinuously. A scheduled message includes many broadcast messages to be sent in a cell. The duration occupied by the broadcast messages in scheduled message is called scheduled period. The scheduled message includes both the description of short messages (arranged in the order of transmission sequence) to be broadcasted and their respective positions in the scheduled period. Therefore, MS can fetch the wanted broadcast message in the least time, and the power consumption is also decreased. Please refer to 0412.

Note: If the cell broadcast message function is used, it must be set to "Yes". Otherwise, it must be set to "No".

DL DTX

Range: Yes, No

Unit -

Default: Yes

Description: Indicates whether to use downlink DTX in a cell. The DTX switch in MSC is still functional. When MSC forbids downlink DTX, then downlink DTX cannot be used in BSC. When MSC allows downlink DTX, then downlink DTX in BSC is determined by BSC DL DTX.

South latitude/North latitude

Range: 0, 1

Unit -

Default: 0: north latitude

Description: 0: north latitude

1: south latitude

East longitude/West longitude

Range: 0, 1

Unit

Default: 0: east longitude

Description: 0: east longitude

1: west longitude

Latitude



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Range: [0, 223-1]

Unit

Default: Calculate based on the default value in the configuration console

Description: This field is used to calculate the latitude code based on the actual latitude.

N represents the latitude code. X represents the absolute value of the actual latitude (0. – +90).

N is represents by three bytes totally 24 bits (bit0 – bit23) .bit23 is the sign bit. bit0-bit22 are the numeric value .

1) Sign bit

S: Sign of latitude

Bit value 0 North positive

Bit value 1 South negative

2) Numeric value

N= [X*223/90.], [] means take the integer value. The range of N is: 0 –223-1 except when X=90. When X = 90, N is 223-1, but not 223.

Longitude

Range: See ”description”

Unit none

Default: Calculate based on the default value in the configuration console

Description: This field is used to calculate the longitude code based on the actual longitude.

N represents the longitude code. X represents the actual longitude (-180. – +180). −180 degree means the east longitude 180 degree.

N is represents by three bytes totally 24 bits (bit0 – bit23) in the form of complement

N= [X*223/360.], []means take the integer value. The range of N is: –223–223-1 except when X=180. If X=180, N is 223-1 but not 223.

Antenna azimuth angle

Range: 0 – 360

Unit Degree

Default: 360

Description: –

Note 360 degree omni antenna

Included Angle (Degree)



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Range: 1 – 360

Unit degree

Default: 360

Description:

Note 360 degree omni antenna

Antenna height

Range: 0 – 65535

Unit decimeter

Default: 400

Description: The height of the antenna

2.3.3 Cell Allocation Table

It is also called CA list. The CA table mainly configures the available frequencies and at most 64 frequencies can be configured.

According to the GSM 900 recommendations the channels are numbered as follows:

fl(n) = 890.2 + 0.2*(n - 1) in MHz, where n (Absolute Radio Frequency Channel Number, ARFCN) goes from 1 to 124 and fl is a frequency in the lower band, BTS receiver.

fu(n) = fl(n) + 45 in MHz, where n goes from 1 to 124 and fu is a frequency in the upper band, BTS transmitter.

According to the DCS 1800 recommendations the channels are numbered as follows:

fl(n) = 1710.2 + 0.2*(n - 512) in MHz, where n (Absolute Radio Frequency Channel Number, ARFCN) goes from 512 to 885 and fl is a frequency in the lower band, BTS receiver.

fu(n) = fl(n) + 95 in MHz, where n goes from 512 to 885 and fu is a frequency in the upper band, BTS transmitter.

The configuration principle is as shown in the following example. For example, if a BTS S5/5/5 is to be configured, its cell allocation table is as follows:



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Module ID Cell ID ARFCN

0 ARFCN

1 ARFCN

2 ARFCN

3 ARFCN

4 ARFCN…

2 51 45 59 68 77 86 Not filled

2 52 49 62 71 80 89

2 53 53 92 65 74 83

BSC sends the cell CA list to MS through system information.

For the sake of forming a regulation, it is recommended to set ARFCN 0 as BCCH.

CA list is delivered in bitmap. Different bitmaps support different frequency sets.

2.3.4 BA1 Table

BA1 table is used to inform the MS in the idle mode to research the BCCH frequencies of neighboring cells. BA list is sent through system information 2, 2bis, and 2ter. The MS in the idle mode keep monitoring the information about BCCH frequencies in the BA list so as to initiate the cell reselection process. The frequencies in BA list should be the consistent with the configuration of neighboring cells.

2.3.5 BA2 (SACCH) Table

It is also called BA2 list. BA2 table is used to inform the MS in the active mode to search the BCCH frequencies of neighboring cells. BA list is sent through system information 5, 5bis, and 5ter.

Note: During network optimization, all BCCH frequencies in the network can be put into the BA2 table so as to use the performance measuring function of the undefined neighboring cells in the traffic statistics console to find out the adjacent missing cells.

It is recommended that the maximum frequencies should not exceed 15.

The limitation of 32 neighbor cells is not due to the BA table but the cell neighboring relationship array, which is defined by the host and whose length is 32. In addition, the auto configuration system checks the relationship of the 32 neighbor cells. Under automatic mode, the auto configuration system fills the BA1 and BA2 table according to the neighboring cell relationship. If the neighboring relationship is modified, for instance, add a cell, delete a cell, you shall maintain the BA1, BA2 table manually.



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2.3.6 Cell Attribute Table

Interf. band Thrsh. 0

Range: 115–85

Unit dBm

Default: Fixed as 110.

Description: BSS measures the uplink status of the radio channels occupied by MS, calculates and reports the interference of the idle channel so as to facilitate BSC to decide channel assignment. Interference is manually classified into 6 levels according to the interference signal strength.

Note: 1, Interf. band Thrsh. 0:excluded in traffic statistics.

2, It ranges from 115 to 85 for all versions of BTS2X, previous versions of BTS3X 03.1130, previous versions of 3001C07.0301 and previous versions of 3002C02.0820. Hard cell kickoff will be caused if Interf. band Thrsh. 0 is beyond the range.

3. It ranges from 115 to 48 for BTS3X 03.1130 and its later versions, 3001c 07.0301 and its later versions, 3002c 02.0820 and its later version.


Range: 115–85

Unit dBm

Default: 105

Description: See above description of Interf. band Thrsh. 0.

Note: See above note of Interf. band Thrsh. 0.

Interf. band Thrsh.2

Range: 115–85

Unit dBm

Default: 98




Range: 115–85

Unit dBm

Default: 90



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Range: 115–85

Unit dBm

Default: 87




Range: 115–85

Unit dBm

Default: Fixed as 85

Description: -


Interf. Calculation period

Range: 1–31

Unit SACCH period (480 ms)

Default: 20

Description: The interference level on the idle channel is averaged before radio resources indication messages are sent, The averaged result is used to classify the interference level into 5 interference bands. This parameter is the period of averaging the interference level. See Protocol 0808, 0858, and 1221.

SACCH multi-frames

Range: 0–63


Default: 14

Description: Used to determine whether the uplink radio link connection fails. BSS will judge whether the radio link failure as according to uplink SACCH BER. See Protocol 0508, 0858, and 0408.

When BTS receives the uplink MRs on SACCH, it will set this parameter as the initial value of the timer which is used to judge the radio connection failure. Every time BTS fails to decode the



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MR sent from MS, this timer minus 1 and plus 2 every time BTS succeeds to decode the MR. When the timer reaches 0, then it judges that the radio connection fails. Then BTS sends a message of radio connection failure to BSC. This parameter and the radio link timeout are used to judge the uplink/downlink radio connection failure.

Note: 1, Earlier versions of BTS3X 04.0529 support a maximum of 16 SACCH multiframes, while 31 do BTS3X (05.0529) and BTS2X, and 63 do BTS3X (versions after 06.0529).

2, BTS3001C, 05.0301A or earlier support a maximum of 31 SACCH multiframes, while 63 do versions after 06.0301A.

3, Alarm occurs if the parameter value does not match with the version.

BTS3X, NACK is returned during loading (parameter value is beyond the range). Cell initialization fails.

BTS2X, NACK is returned during loading (process error). Cell initialization fails.

Various BTS versions supporting 0–63 SACCH multiframes

BTS3X BTS23 BTS22C BTS24 BTS3001C(3001C+) BTS3002

06.0529 and latter 07.0420 and latter 06.0110 and later 06.1111 and later 06.0301A and later 00.0820 and latter

Radio resource report period

Range: 0–255

Unit Second

Default: 10

Description: BTS needs to periodically inform BSC of the interference level of idle channel on every TRX through the radio indication message. This parameter specifies the interval for sending the message.

CCCH load indication period

Range: 0–255

Unit Second

Default: 15

Description: This parameter is used by the BTS to inform the BSC that the load of one specified CCCH slot .If the load of a certain CCCH exceeds the related threshold, BTS should periodically send CCCH overload messages to BSC. CCCH overload includes RACH overload and PCH overload. This parameter indicates the interval of the BTS for sending overload message. A very small



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value of this parameter will cause a large signaling traffic of Abis interface. If this value is set too large, BSC may not be able to handle BTS abnormality in time.

CCCH load Thrsh.

Range: 0–100

Unit %

Default: 80

Description: This parameter is used by the BTS to inform the BSC that the load of one specified CCCH slot .If the load of a certain CCCH exceeds this threshold, BTS should periodically send CCCH overload messages to BSC. If the value of this parameter is too low, BTS is more likely to report CCCH overload message to BSC. In this case MS is more difficult to access the system and thus lower the resource utilization. If the value is too high, BTS will report overload message to BSC only when the system resource is in shortage. This will cause the system fault more easily.

Max resend times of Phy. Info.

Range: 1–255

Unit times

Default: 30

Description: During the asynchronous handover, MS constantly sends the handover access Burst to BTS. When BTS detects the Burst, BTS send physical information to the MS on the main DCCH/FACCH, and starts timer T3105. At the same time, it sends the MSG_ABIS_HO_DETECT message to BSC. The physical information contains related information of different physical layers so as to guarantee the correct access of MS. If the timer T3105 times out before receiving the SAMB frame from MS, BTS re-sends physical information to MS.

This parameter specifies the maximum times Ny1 for re-sending physical information. If the number of resending times exceeds Ny1 and BTS still has not received any correct SAMB frame from MS, BTS will send BSC the connection failure message and handover failure message. After BSC receives the messages, it will release the assigned dedicated channel and stop timer T3105. See Protocol 0858 and 0408. The value of this parameter can be increased correspondingly when the handover becomes slow and handover success rate is low which is caused by clock or bad transmission condition.

Note: When Ny1 * T3105 > the duration between EST IND and HO DETECT, MS handover will succeed. Otherwise, MS handover will fail.



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T3105

Range: 0–255

Unit 10 ms

Default: 7

Description: T3105 is a timer for radio connection. See the description of Max resend times of Phy. Info.

Overload indication period

Range: 1–255

Unit Second

Default: 15

Description: Specifies the interval for BTS to send the overload message to BSC. Overload includes TRX processor overload, downlink CCCH overload and AGCH overload. See Protocol 0858.

RACH busy Thrsh

Range: 0–63, (-110 dBm–- +47 dBm)

Unit Grade

Default: 5 (BTS2X, BTS24)), 16 (BTS3X)

Description: The threshold level that judges whether the RACH is busy.

1. In BTS3X versions, it means level threshold for MS random access. If the level of some random access burst timeslot is greater than this threshold, BTS regards this RACH busy. In BTS3X, this parameter is used to indicate whether the RACH is busy or not. The threshold value has no impact upon MS normal access.

2. In BTS2X versions (excluding BTS24), it means level threshold for MS random access. If the level of some random access burst timeslot is greater than this threshold and the access demodulation succeeds , BTS regards this RACH busy, and judge whether the RACH access is valid with reference to “random access error threshold”. In BTS2X, this parameter is used to indicate whether the RACH is busy or not. Besides, the threshold value has impact upon MS normal access. That is, only if the level of the random access burst timeslot is greater than the threshold, is the MS access allowed.

3. In the BTS24 version, it has two meanings: first, it means the level threshold for MS random access. If the level of some random access burst timeslot is greater than this threshold, BTS regards this timeslot is busy; then, it means whether the MA access is allowed. Only when the access level (including random access and handover access) is greater than the threshold, the access is allowed.



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Note: 1, In BTS2X (excluding BTS24), it means level threshold for MS random access. If the level of some RACH burst timeslot is greater than this threshold, BTS regards this RACH busy. This parameter must be set based on actual BTS sensitivity and the lowest MS access level to ensure uplink/downlink balance. This parameter value has impact upon RACH BURST switch access during asynchronous switching.

2, In BTS3X, RACH busy threshold has impact upon the report of CCCH_LOAD_IND, but not any upon MS access. If the BCCH level received by network is greater than RACH busy threshold, the RACH access will be included in the CCCH_LOAD_IND statistics no matter the decoding is successful. Likewise, if the BCCH level received by network is lower than RACH busy threshold and the decoding is successful, RACH access will also be included in CCCH_LOAD_IND statistics. The statistics period is RACH average load timeslots. If the RACH busy threshold is set too low, BTS tends to judge the RACH as busy and report overload message to BSC. Whereas, BTS can not judge the status of RACH timeslot correctly.

3, In BTS24, RACH busy threshold has two settings: when used to judge the busy timeslot, its setting is similar to that of BTS30; when used to judge whether the level of the random access is valid, its setting is similar to that of BTS20.

4, The settings of BTS312, 3001C, 3001C+ and 3002C are similar to that of BTS30.

RACH min. access level

Range: 0–255

Unit Grade

Default: 5 (BTS3X 05.0529A and its previous version).

1 (BTS 3X 06.0529A and its later version).

Description: The "RACH minimum access level" of the version 03.0529 of BTS3X or above will affect MS access. This parameter indicates the threshold level at which the system determines MS random access. Only when the level on RACH exceeds this threshold will BTS regard the access to be successful.

When the level of the received RACH burst is smaller than the threshold, BTS regards the access is invalid.

Because the RACH busy threshold shall be greater than the RACH minimum access level, the RACH minimum access level of the BTS24 can be regarded as “being masked”.

For the BTS2X (excluding BTS24), RACH minimum access level is invalid.

Note: The value of RACH busy Thrsh. should be greater than RACH min. access level.

To avoid MS being unable to set up call even it is in the coverage



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area, consideration should be given to BTS sensitivity and MS RXLEV_ACCESS_MIN during the setting of this parameter.

Average RACH load TS number

Range: 0–65535

Unit timeslot number

Default: 5000

Description: Indicates the duration of judging whether RACH timeslot is busy, i.e., the number of RACH Burst during one RACH occupancy detection. If the value of this parameter is too low, BTS is more likely to report RACH overload message to BSC. This will cause that MS more difficult to access the system and lower the resource utilization. If the value is too high, only when the system resource is in shortage will BTS report overload message to BSC which is likely to cause the system fault.

Max RC power reduction

Range: 0–255

Unit 2 dB

Default: 5

Description: Specifies the maximum level of BTS RF power that can be decreased.

T200 SDCCH(5ms)

Range: 1–255

Unit 5 ms

Default: 60

Description: The value of T200 on SDCCH. when support SAP10 service.

Note: The T200 timer (Timer200) is an important timer about data link layer LAPDm of the Um interface. Different timer values should be set for different LAPDm channels such as SDCCH, FACCH and SACCH. This is because these channels have different transmission rate. The T200 timer is used to avoid deadlock during data transfer on the data link layer. The communication entities of both ends of such data links adopt the sending of acknowledgment mechanism. That is to say, every time message is sent, the opposite end is requested to acknowledge the reception. If this message is lost for unknown reasons, it will occur that both ends keep waiting, leading to system dead lock. Therefore, a timer should be started when the sender sends a message. If the timer times out, the sender will regard that the receiver has not received the message and will resend the message.



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T200 FACCH/F(5 ms)

Range: 1–255

Unit 5 ms

Default: 50

Description: The value of T200 on FACCH/F.

T200 FACCH/H(5 ms)

Range: 1–255

Unit 5 ms

Default: 50

Description: The value of T200 on FACCH/H.

T200 SACCH TCH SAPI0(10 ms)

Range: 1–255

Unit 5 ms

Default: 150

Description: The value of T200 on TCH SAPI0. SACCH when TCH supports SAPI0 service

T200 SACCH TCH SAPI3(10 ms)

Range: 1–255

Unit 10 ms

Default: 200

Description: The value of T200 on SACCH when TCH supports SAPI3 service

T200 SACCH SDCCH(10 ms)

Range: 1–255

Unit 10 ms

Default: 60

Description: The T200 value of SACCH on the SDCCH

T200 SDCCH SAPI3(5ms)

Range: 1–255

Unit 5 ms



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Default: 60

Description: The value of T200 when SDCCH supports SAPI3 service.

MAX TA

Range: 0–63(Normal cell and single TS extended cell), 0–255(dual TS extended cell).

Unit bit period (1 bit = 0.55 km)

Default: 62 for normal cell, 63 for single TS extended cell, and 219 for dual TS extended cell.

Description: Maximum Time Advance. Determines the actual coverage area of BTS. When BTS receives the channel request message or handover access information, it determines whether channel assignment or handover should take place in the current cell by comparing the TA with the value of this parameter. Handover successful will be affected with a small configuration.

Note: The Range of MAX TA for normal cells is 0–63.Single TS extended cell is not recommended at present.

.At present, in BTS temporary version 80.0529A supporting dual TS extended cell, MAX TA in cell property configuration list does not work in application. Its value ranges from 0 to 127. BTS initialization fails if MAX TA exceeds 127.

Frame start time

Range: 0–65535

Unit Frame number

Default: 65535

Description: The frame number of the BTS starts timeslot that is used to keep synchronization between BTS and MS after base station has re-initialize.

Paging times

Range: BTS 2X (except BTS24): 1~4

BTS24 version 07.1111 and later, BTS3X version 01.1130SP03 and later, BTS3001C version 07.0301 and later, BTS3002C version 03.0820 and later: 1~8

BTS3X version 01.1130 to version 01.1130SP02: 1~5

The earlier versions of the above BTSs do not support paging retransmission

Unit Times

Default: 1



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Description: In BTS2.X, this parameter is used for BTS to determine whether paging is resent. Together with the paging times configured in MSC, they jointly control the paging resend times. The total paging times approximate to be the multiplication of the two.BTS3X and its later version will support paging resending function.

Note: The MSC paging resend strategy is as follows:

1) MSC6.0 can resend paging message at most 4 times, and the resend intervals are 3 seconds, 3 seconds, 2 seconds, and 2 seconds respectively.

2) Within 2 seconds after the last paging message is sent, i.e., 12 seconds after the first paging message is sent, if there is no paging response from MS, MSC will regard it as timeout.

MSC can adopt two types of paging modes: TMSI and IMSI.

Random access error Thrsh

Range: 0–255

Unit -

Default: 180

Description: The system can determine whether a received signal is an MS random access signal by judging the dependency on the training sequence (41bit). This parameter defines the dependency of the training sequence. If the value of this parameter is too small, there will be a high random access signal error tolerance, so that MS random access will be easy but the misreport will also be high. If the value is too large, the MS misreport rate will be low, but the normal access will be hard.

DC bias voltage Thrsh.

Range: 0,2–4

Unit

Default: 0 for with tower-mounted amplifier, 3 for without tower-mounted amplifier

Description: BTS2X, This parameter is used to compensate the RSSI difference of whether there is tower-mounted amplifier. This is to guarantee a correct RSSI value in the case of without tower-mounted amplifier. The value of this parameter in the case of without tower-mount amplifier is greater than the case of with tower-mount amplifier by 3.

BTS3X,no use

Cell extension type



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Range: Normal cell, Single timeslot extended cell, Dual timeslot extended cell

Unit -

Default: Normal cell

Description: Indicates whether a cell is an extended cell and the extended cell mode. Single timeslot extension is based on the fixed delay extension and dual timeslot extension is based on classic solution extension.

The single timeslot extended cell adopts IUO to obtain a wide coverage. The radius difference between OverLaid subcell and UnderLaid subcell does exceed 35km. BTS increases fixed delay between the downlink transmission and uplink receiving for the UnderLaid subcell. MS and BTS can work normally when they use the normal TA value. Theoretically, In this mode, Huawei BSS provides the extended cell with a maximum coverage of 70km.

The dual timeslot extended cell combines two timeslots to provide sufficient delay. Theoretically, a maximum TA value of 219 is supported, i.e., 120km coverage radius. Dual extended timeslot cell can be divided into two types: cell class and TRX class. Cell class is adopted at present. Versions after 03.1120A (BTS 00.1130A and latter) support TRX class dual timeslot extended cell.

Note: 1. For dual timeslot extended cell, MAX TA should be set as 219, or any calls in this cell can not be realized even there are signals.

2. For dual timeslot extended cell, if the main BCCH/SDCCH/GPRS is on the current TRX, the concentric circle must be set as OverLaid subcell, or a prompt of error is displayed.

3. For dual timeslot TRXs in the dual timeslot extended cell, only the even timeslots are effective. But the normal TRXs in the dual timeslot extended cell are the same with the TRXs in the normal. That is, eight timeslots are all effective.

4. When adopt the Huawei dual timeslot technology, one sector can hold four TRX, there are totally 13 TCH channels. The specific configuration is as follows:

The channels of the extended cell can only use the even timeslots. The total even timeslot of four TRX is (4 * 8)/2 = 16. Primary BCCH uses TS0 (BCCH carrier). SDCCH can use one or two even timeslots. Therefore, TCH can use 13 even timeslots.

5. the configuration of the extended cell with single TRX dual timeslot before/after the cell broadcast is activated.

(1) Configuration before cell broadcast is activated

TS0: primary BCCH

TS2: SDCCH/8



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TS4: TCH/F or TCH/H

TS6: TCH/F or TCH/H

Or

TS0: combined BCCH

TS2: TCH/F or TCH/H

TS4: TCH/F or TCH/H

TS6: TCH/F orTCH/H

(2) configuration after the cell broadcast is activated

TS0: BCCH+CBCH (including SDCCH)

TS2: TCH/F or TCH/H

TS4: TCH/F or TCH/H

TS6: TCH/F or TCH/H

Or

TS0: primary BCCH

TS2: SDCCH + CBCH

TS4: TCH/F or TCH/H

TS6: TCH/F or TCH/H

6. The dual timeslot extended cell is similar to the normal cell in RF frequency hopping mode. If the RF frequency hopping mode of the dual timeslot extended cell is baseband frequency hopping, the same MA set should include TRXs of the same type (either dual timeslot TRXs or normal TRXs), or a prompt of error is displayed.

Cell extension offset

Range: 0–35

Unit Km

Default: 0 (normal cell), 34 (single timeslot extended cell)

Description: As the GSM time advance has a limit of 63 bits, so the radius of a cell cannot exceed 35 Km. This parameter indicates the coverage radius of normal cell.

Note: This parameter is recommended to be as according to the coverage radius of normal cell measured in drive test. For the single timeslot extended cell, the actual Cell Extension Offset should not be set exactly as 34. There must be overlapping area between normal cells and extended cells.



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Low noise amplification bypass switch permission

Range: Yes, No

Unit: No

(1) If BTS3002C is configured as two TRXs per cell (O2 or S2), the “Low noise amplification bypass switch” is configured as “Yes”. In this case, main diversity is supported in RF connection

(2) If BTS3002C is configured as one TRX per cell (O1, S1 or S1/1), the configuration of the “Low noise amplification bypass switch” depends on the antenna number of the cell.

(a) When the cell has only one antenna (diversity receive not used). the “Low noise amplification bypass switch” is configured as “Yes”. In this case, almost no diversity is supported

(b) When the cell has two antennas (diversity receive used), the “Low noise amplification bypass switch” is configured as “No”. In this case, independent TRX diversity is supported.

Description: BSC04.1120 is added with the parameter “Low noise amplification bypass switch” for BTS3002C. In 3002C, signals on main diversity antennas are optimized through low noise amplification bypass processing. 3002C supports mutual main diversity antenna configuration. That is, the main receiving signals of a DRU are connected to the diversity receiving interface of another DRU after low noise amplification bypass processing. Diversity signals need not low noise amplification bypass processing since main signals have experienced that. Therefore, after antenna configuration of the cell is certain, IOMU configures IBBU properties via setting TRX properties, and writes the corresponding data in logic register to indicate whether diversity signal low noise amplification bypass switch is effective.

LAPDm N200 para flag

Range: Yes/No

Unit -

Default: No

Description: Determine whether BSC deliver LAPDm N200 parameters to BTS. If it configured as Yes, then deliver LPADm N200 parameters, else not deliver.

N200 of establish

Range: 5–254

Unit Times



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Default: 5

Description: Max retransmit times of multi-frame establish in progress (state).

N200 of release

Range: 5–254

Unit Times

Default: 5

Description: Max retransmits times of multi-frame release in progress (state).

N200 of Sacch

Range: 5–254

Unit Times

Default: 5

Description: Max retransmits times on SACCH.

N200 of Sdcch

Range: 23–254

Unit Times

Default: 23

Description: Max retransmits times on SDCCH.

N200 of Facch/Half Rate

Range: 29–254

Unit Times

Default: 29

Description: Max retransmits times on FACCH (Half rate channel).

N200 of Facch/Full Rate

Range: 34–254

Unit Times

Default: 34

Description: Max retransmits times on FACCH (Full rate channel).

Imm_Ass retransmit para flag



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Range: Yes/No

Unit -

Default: No

Description: Determine whether BSC deliver immediate assignment retransmit parameters to BTS. If it configured as Yes, then deliver immediate assignment retransmit parameters, else not deliver.

Max delay of Imm_Ass retransmit

Range: 0–254

Unit 250 ms

Default: 4

Description: In the time of Max delay of Imm_Ass retransmit, immediate assignment command can be scheduled to retransmit. Out of this time, not retransmit.

Max transmit times of Imm_Ass

Range: 1–5

Unit Times

Default: 2

Description: Max retransmits times of immediate assignment command. When retransmit times up to this value, it stop retransmit, even if it is not out of the Max delay time of Imm_Ass retransmit.

2.3.7 Cell Alarm Threshold Table

Power output error Thrsh.

Range: 0–9, indicating -10dB–-1dB respectively

Unit -

Default: 2

Description: Used in BTSM. When the output power of a TRX is different from a nominal value, errors will occur. There are two error thresholds used to generate alarm: Power Output Error Threshold and Power Output Reduction Threshold.

Power output reduction Thrsh

Range: 0–18



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Unit -

Default: 2

Description: See the description of Power Output Error Threshold.

VSWR TRX error Thrsh

Range: 0–12

Unit -

Default: 2

Description: VSWR TRX error threshold.

VSWR TRX unadjusted Thrsh

Range: 0–12

Unit -

Default: 2

Description: VSWR TRX unadjusted threshold.



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2.3.8 Cell Call Control Table

TCH immediate assignment

Range: Yes, No

Unit -

Default: No

Description:

Option "Yes" means that TCH channel can be immediately assigned as signaling and traffic channel when SDCCH has no available resource. The option "No" means that only SDCCH can be assigned.

In GSM BSC32 051120 and latter BSC versions, TCH immediate assignment for caller/called depends on both “Call parameter 5” (BIT 0 and BIT 1) in [Software Parameter Table] and “TCH immediate assignment” in [Cell call control table].

In GSM BSC32 051120 and latter BSC versions, “Call parameter 5” in [Software Parameter Table] is set as:

(1) Caller TCH immediate assignment permitted (FFFE)

(2) Called TCH immediate assignment permitted (FFFD)

(3) Caller/called TCH immediate assignment permitted (FFFC)

In this case, great caution is necessary to avoid TCH congestion.

In GSM BSC32 051120 and latter BSC versions, whether full rate channel or half rate channel is used first during caller/called TCH immediate assignment depends on BIT4 of “Call parameter 5” in [Software Parameter Table].

For emergency call or call re-establishment, whether TCH immediate assignment is permitted depends on “TCH immediate assignment” in [Cell call control table] instead of “Call parameter 5” in [Software Parameter Table]. And full rate channel instead of half rate channel is used.

In BSC06.1120, there is “TCH immediate assignment” field in [Software Parameter Table].

In data management system: In [Configuration/Software Parameter/Software Parameter Table], BIT0 of Call parameter 5 controls caller TCH immediate assignment, and BIT1 controls called TCH immediate assignment.

Settings of software parameters and their corresponding roles are given below.

BIT0 of Call parameter 5: is 1 by default. “0” means TCH immediate assignment is permitted for caller, and “1” means not.

BIT1 of Call parameter 5: is 0 by default. “0” means TCH immediate assignment is permitted for called, and “1” means not. TCH immediate assignment Bit15–Bit2 Bit1 Bit0 TCH immediate assignment not in use XXXXXXXXXXXXXX 1 1 Caller TCH immediate assignment permitted XXXXXXXXXXXXXX 1 0 Called TCH immediate assignment permitted XXXXXXXXXXXXXX 0 1 Caller/called TCH immediate assignment permitted XXXXXXXXXXXXXX 0 0



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With reference to “TCH immediate assignment” in [Cell call control table] of data management system, types of channels allocated by BSC are given below.

TCH immediate assignment Access reason Call parameter 5

(TCH immediate assignment not permitted) Call parameter 5

(TCH immediate assignment permitted)

On Call establishment SDCCH SDCCH

Paging response SDCCH SDCCH

Emergency call SDCCH SDCCH

Call re-establishment SDCCH SDCCH

Location updating SDCCH SDCCH

Off Call establishment First SDCCH, then TCH First TCH, then SDCCH

Paging response First SDCCH, then TCH First TCH, then SDCCH

Emergency call First TCH, then SDCCH First TCH, then SDCCH

Call re-establishment First TCH, then SDCCH First TCH, then SDCCH

Location updating SDCCH SDCCH

Wherein, “first” means the type of the channel allocated the first time, and “then” means the type of the channel allocated the second time after no channel is allocated the first time.

In BSC06.1120, there is “Capacity and Quality” in [Software Parameter Table] to control whether full rate channel or half rate channel is used during caller/called TCH immediate assignment.

In [Configuration/Software Parameter/Software Parameter Table] of data management system, for BIT4 of Call parameter 5, settings of software parameters and their corresponding roles are given below.

BIT4 of Call parameter 5: is 1 by default. “0” means that half rate channel is used during caller/called TCH immediate assignment, and “1” means full rate channel is used. Half rate switch Bit15–Bit5 Bit4 Bit3–Bit0 Voice quality. For dual-rate MS, the type of the channel allocated in TCH immediate assignment is “full rate/half rate but preferred full rate, channel type unchangeable” to ensure the conversation quality. XXXXXXXXXXX 1 XXXX Channel capacity. For dual-rate MS, the type of the channel allocated in TCH immediate assignment is “full rate/half rate but preferred half rate, channel type unchangeable” to ensure the service channel capacity. XXXXXXXXXXX 0 XXXX



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For single rate MS or other MSs of unknown type, the full rate TCH is allocated no matter what value this parameter is assigned with.

Therefore, channels allocated during TCH immediate assignment include three types, “full rate TCH”, “full rate/half rate TCH but preferred full rate, channel type unchangeable” and “full rate/half rate TCH but preferred half rate, channel type unchangeable”.

Immediate assignment Opt.

Range: Yes, No

Unit -

Default: No

Description: Option "Yes" means it is allowed to optimize assignment of channels activated by BTS when there are multiple MS access requests. This is to guarantee network response speed.

Note: This parameter is mainly used for satellite transmission, i.e., to reduce the impact of satellite transmission delay. For terrestrial transmission, it is recommended to be set to “No”.

Immediate assign to other cell

Range: Yes, No

Unit -

Default: No

Description: The option "Yes" means that it is allowed to assign SDCCH channel between cells when there is MS access request. After the system receives the access request, it can immediately assign SDCCH of other cells to MS.

Assign to other cell

Range: Yes, No

Unit -

Default: Yes

Description: When SDDCH is occupied, the option "Yes" means it is allowed to assign TCH and terrestrial circuit of other cells during assignment.

TCH assignment retry

Range: Yes, No

Unit -

Default: No



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Description: The option "Yes" means that assignment retry is allowed if assignment fails during TCH assignment.

Short message uplink disabled

Range: Yes, No

Unit -

Default: No

Description: Point-to-point short message sending prohibition control. It is used to ensure enough radio channel resources for normal calls, and control whether the uplink short message of the specified cell is sent if necessary. When the uplink point-to-point short message transmission prohibition control is enabled, MS can not use radio channel resources to send short messages no matter MS is idle or in conversation.

Note: Make sure to check this parameter in upgrading. Set “Short message uplink disabled” as No. if short message sending is permitted.

Short message downlink disabled

Range: Yes, No

Unit -

Default: No

Description: Point-to-point short message sending prohibition control. It is used to ensure enough radio channel resources for normal calls, and control whether the downlink short message of the specified cell is sent if necessary. When the uplink point-to-point short message transmission prohibition control is enabled, MS in idle can not use radio channel resources to receive short messages, while MS in conversation can since it needs not additional radio channel resources.

Note: Make sure to check this parameter in upgrading. Set “Short message downlink disabled” as No. if short message sending is permitted.

TCH flow alarm

Range: Yes, No

Unit -

Default: No

Description: Whether to enable the TCH overload alarm function.

Abis flow control permitted

Range: Yes, No



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Unit -

Default: Yes

Description: Whether to allow performing flow control for Abis interface.

TCH flow control allowed

Range: Yes,

Unit -

Default: No

Description: Indicates whether to allow flow control for TCH.

Direct retry

Range: Yes, No

Unit -

Default: Yes

Description: TCH direct retry. It is realized in switching flow (switched to the neighboring cell). Correspondingly, signaling channel switching relative data (signaling channel switching time, filter length etc.) must be set, but whether TCH direct retry is enabled is not important. Direct retry is not a measure to solve traffic congestion. Instead, it is only an emergency operation during traffic peak in local radio network. If direct retry takes place frequently in local radio network, it is necessary to adjust BTS cell TRX configuration and network layout.

Frequency band of reassign

Range: Same band (0), Different band (1)

Unit -

Default: Same band

Description: The parameter is used to choose band for re-assignment.

If "Same Band" is selected, system will prefer the channel in the same band for re-assignment; If "Different Band" is selected, system will prefer the channel in the different band for re-assignment.

Allow Reassign

Range: Yes, No

Unit -

Default: No

Description: Indicates whether to allow Reassign TCH. When BSC receive the ASSIGNMENT FAILURE from UM, the BSC initiate the second ASSIGNMENT.



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Allow eMLPP

Range: Yes, No

Unit -

Default: No

Description: Indicates whether to allow eMLPP. BSC choose the lowest subscriber to handover, and the higher subscriber obtains the idle TCH.

2.3.9 Cell Call Control Parameter Table

T3101

Range: 3–50

Unit 100 ms

Default: 30

Description: Timer used in TCH immediate assignment. T3101 times when the TCH immediate assignment (IMM ASS) is delivered and ends when the link establishment indication (EST IND) is reported. If T3101 does not receive EST IND in the specified duration, BSS will release the SDCCH occupied.

Assign-TCH idle rate Thrsh.

Range: 0–100

Unit %

Default: 80

Description: Only when SDCCH resource is used up and TCH idle rate reaches this threshold will TCH immediate assignment is allowed.

Assign-TCH re-Estb. rate thrsh.

Range: 0–100

Unit %

Default: 80

Description: When the history record of TCH call re-establishment success rate reaches this threshold, TCH immediate assignment can be allowed.

TCH flow control start thrsh.

Range: 0–7



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Unit idle TCH timeslots in a cell

Default: 2

Description: Only when the number of idle TCH timeslots is less than this threshold can TCH flow control be started.

Max assignment retry times

Range: 0–3

Unit Times

Default: 2

Description: Max Assignment Retry Times is valid only when the TCH Assignment Retry is set to "Yes".

Idle TCH Thrsh. for SD to TCH HO

Range: 0–100

Unit %

Default: 80

Description: When the idle rate of TCH reaches this threshold, MS is allowed to directly hand over from SDCCH to TCH. The parameter is valid when SDCCH-to-TCH handover in the cell is "Yes".

Max. radio CH release retry times

Range: 0–3

Unit Times

Default: 1

Description: Indicates the maximum release retry times allowed when the abnormal release of radio channel occurs.

Service type Req.(SD to TCH HO)

Range: MSC service request, Location updating request, Paging response, MSC service re-establishment request, Unknown

Unit -

Default: MSC service request

Description: Indicates the allowed service request type when the handover between SDCCHA and TCH occurs.

Syst. delay frame No. adj. value

Range: 0



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Unit -

Default: 0

Description: Used to adjust frame number shift caused by the distance between two cabinets exceeding 3 m.

Response on out BSC HO Req.

Range: Yes, No

Unit -

Default: Yes

Description: Determines whether BSC responses to the handover request. For example, after BSC sends a handover request to MSC, MSC will check the radio channel resource and terrestrial circuit resource; then it might response the BSC request. If this parameter is set as "No" and MSC finds that there is not resource available, MSC will not response a Handover Reject to BSC. Thus, in traffic statistics, it can be found that the number of handover requests > successful handover times + handover failure times.

T3103A(s)

Range: 1–75

Unit Second

Default: 10

Description: In the case of intra-BSC handover, the timer starts at source cell delivering handover command to MS, and stops at receiving internal clear command or establish indication. In the case of inter-BSC handover, the timer starts at source cell delivering handover command to MS, and stops at receiving clear command or establish indication from MSC.

T3103B1(s)

Range: 1–50

Unit Second

Default: 10

Description: In the case of intra-BSC handover, the timer starts at destination cell delivering internal handover acknowledge, and stops at receiving handover detect or internal clear command. In the case of inter-BSC handover, the timer starts at destination cell delivering handover request acknowledge, and stops at receiving handover detect or clear command.

T3103B2(s)

Range: 1–25



2-60

Unit Second

Default: 10

Description: The timer starts at destination cell receiving handover detect (Not need to apply for an optic fiber time slot) or receiving PATH ACK (Need to apply for an optic fiber time slot), and stops at receiving handover complete.

T3107(s)

Range: 1–25

Unit Second

Default: 10

Description: The timer starts when the original cell receives the message MSG_ASS_CH_READY sent from target cell, and stops when the original cell receives the assignment failure or internal clear command.

The timer starts when the target cell receives the channel activation acknowledge, and stops when the target cell receives the assignment complete or internal clear request.

T3109(s)

Range: 3–34

Unit Second

Default: T3109 = a + RadioLinkTimeout × 0.48s, a = 1 or 2s.

Description: The timer starts at delivering message CHANNEL RELEASE, and stops at receiving message RELEASE INDICATION.

T3109 must be greater than the value of “RadioLinkTimeout”. Otherwise, the radio resource is reassigned before the RadioLinkTimeout timer times out (that is, the radio link is not released yet).

T8(s)

Range: 1–255

Unit Second

Default: 10

Description: The timer starts when receive the HANDOVER COMMAND from the MSC and stops when receive the CLEAR COMMAND from MSC.

T3103C(s)

Range: 1–255



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Unit Second

Default: 10

Description: The timer is for the intra-cell handover. It start when receives the HANDOVER COMMAND sent from MS through the target channel and stops when receive the HANDOVER COMPLETE sent from MS through the target channel.

TMODIFY(s)

Range: 1–255

Unit Second

Default: 10

Description: During the assignment period, the timer start when send MODE MODIFY to BTS and stops when receive MODE MODIFY ACK.

TREESTABLISH(s)

Range: 0–255

Unit Second

Default: 0

Description: When the call is carried through the static TCH, if receive the ERROR INDICATION, CONNECTION FAILURE INDICATION, RELEASE INDICATION messages, and the cell of the call allows call reestablishment, this timer starts. The timer stops when receive the CLEAR COMMAND message from MSC.

Queueing timer(s)

Range: 1–255

Unit Second

Default: 8

Description: The timer starts at receiving assignment request but no available channels, and stops at receiving message MSG_RET_RES.

A interf. est. rsp.(s)

Range: 1–255

Unit Second

Default: 5

Description: It is the timer used to count the time that the BSC RR waits for the A interface link establishment. It starts when the message “Complete L3” is sent to A interface and stops when the A interface link is established.



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Activated voice code set (full rate), activated voice code set (half rate)

Range: 1 – 0xF0

Unit none

Default: 0xA5 (full rate), 0x0F (half rate)

Description: AMR is the set of multiple voice codec rates. Active Coding Set (ACS) refers to the current available coding rate set. The voice coding rates of the ACS are represented by the BIT map. Each BIT map corresponds to a coding rate. When the bit is 1, it means the ACS includes the coding rate, otherwise, do not include.

Default value of activated voice coding set of full rate voice channel: 0xA5.

Default value of activated voice coding set of half rate voice channel:0x0F.

UL coding rate adjustment threshold 1(full rate)/ UL coding rate adjustment threshold 2(full rate))/ UL coding rate adjustment threshold 3(full rate)

DL coding rate adjustment threshold 1(full rate)/ DL coding rate adjustment threshold 2(full rate)/ DL coding rate adjustment threshold 3(full rate).

UL coding rate adjustment threshold 1(half rate)/ UL coding rate adjustment threshold 2(half rate) /UL coding rate adjustment threshold 3(half rate).

DL coding rate adjustment threshold 1(half rate)/ DL coding rate adjustment threshold 2(half rate)/ DL coding rate adjustment threshold 2(half rate)

Range: 0 – 63

Unit none

Default: 15(adjustment threshold1), 30(adjustment threshold 2), 45(adjustment threshold 3)

Description: MS/BTS automatically adjust the current voice codec rate based on a certain algorithm and the RQI. The coding rate adjustment threshold is the RQI threshold. RQI reflects the C/I. When RQI is 1, the C/I is 0.5dB. When RQI is 2, the C/I is 1dB. The rest may be deduced by analogy. ACS may contain multiple coding rates, therefore, there is a adjustment threshold between two neighboring coding rates.

From adjustment threshold 1 to adjustment threshold 3, the coding rate increases gradually.

UL/DL coding rate (full rate/half rate): default value of adjustment threshold 1 is 15. default value of adjustment threshold 2 is 30. default value of adjustment threshold 3 is 45.

UL coding rate adjustment hysteresis 1(full rate)/UL coding rate adjustment hysteresis 2(full rate)/UL coding rate adjustment hysteresis 3(full rate).

DL coding rate adjustment hysteresis 1(full rate)/DL coding rate adjustment hysteresis



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2(full rate)/DL coding rate adjustment hysteresis 3(full rate).

UL coding rate adjustment hysteresis 1(half rate)/UL coding rate adjustment hysteresis 2(half rate)/UL coding rate adjustment hysteresis 3(half rate).

DL coding rate adjustment hysteresis 1(half rate)/DL coding rate adjustment hysteresis 2(half rate)/DL coding rate adjustment hysteresis 3(half rate).

Range: 0 – 15

Unit none

Default: 7

Description: MS/BTS automatically adjust the current voice codec rate based on a certain algorithm and the RQI. The coding rate adjustment threshold is the RQI threshold. RQI reflects the C/I. When RQI is 1, the C/I is 0.5dB. When RQI is 2, the C/I is 1dB. The rest may be deduced by analogy. ACS may contain multiple coding rates, therefore, there is a adjustment threshold and a adjustment hysteresis between two neighboring coding rates;

UL/DL code rates of full rate and half rate: the default value of adjustment hysteresis 1, adjustment hysteresis 2, and adjustment hysteresis 3 is 7.

Initial coding mode(full rate), initial coding mode(half rate)

Range: 0 – 3

Unit none

Default: 0

Description: The adopted coding rate when the call is just set up. ACS can hold up to four coding rates, therefore, the value of this field can only be 0, 1, 2, and 3, which correspond to the four coding rates of ACS respectively.

The default value of the initial coding mode of full rate voice channel and half rate voice channel is 0.

2.3.10 Cell Module Information Table

Cell Module information table

Range:

Unit:

Default:

Description: CGI and module ID.

BSC implements the handover judgment flow in the LAPD board. Once find the proper target, BSC sends the handover request with



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the GCI of target cell to the MPU board of BSC host. The MPU confirms the module ID of the cell in the [Cell Module Information Table] according to CGI. Then the MPU sends the handover request to this module and counts “Attempted outgoing inter cell handovers” one time. If does not find the CGI in the [Cell Module Information Table], the MPU regards the target cell is outer cell and sends the handover request to BSC and count the “Attempted outgoing inter cell handovers” one time.

Note: The mapping relationship between CGI and its module ID shall be correct. Otherwise, the handover request is sent to other modules. The handover fails. But the BSC still count the “Attempted outgoing inter cell handovers” one time.

2.4 Handover

The following table shows the 16 Bit criterions in BSC handover algorithm used for sorting candidate cells. BSC will finally select the target cell according to handover type and cell sorting result of candidate cells.

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Bits No. 1-3: Sort according to the downlink receiving level (combine the receiving level and the corresponding penalty).

Bit No. 4: Used to indicate the comparison result of handover hysteresis between intra-layer cells. For serving cell, the bit is constantly 0. If the receiving level of neighbouring cell - the receiving level of the serving cell ≥ the inter-cell Handover Hysteresis, then the bit of this neighbouring cell is 0. If the receiving level of neighbouring cell - the receiving level of the serving cell < the inter-cell Handover Hysteresis, then the bit of this neighbouring cell is 1.

Bits No. 5-10: Used for hierarchical cells, totally 6 bits. The system can classify the cells into 64 priorities.

Bit No. 11: Load adjustment bit, used for serving cells. If the traffic load ≥ Load HO Thrsh., this bit is 1. Otherwise, it is 0. If the candidate cell is a neighboring cell, and the load ≥ Load Req. on Candidate Cell, this bit is 1. Otherwise, it is 0. For Load HO Thrsh. and Load Req. on Candidate Cell, see Load Handover Data Table.

Bit No. 12: Used for co-BSC adjustment bit and determined by parameter Co-BSC/MSC Adj. When this parameter is set to "Yes", intra-BSC handover is done in priority.



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Bit No. 13: Used for co-MSC adjustment bit and determined by parameter Co-BSC/MSC Adj. When this parameter is set to "Yes", intra-MSC handover is done in priority.

Bit No. 14: Inter-layer handover hysteresis bit. When the receiving level of a neighboring cell ƒ Inter-layer HO Thrsh. + Inter-layer HO Hysteresis, and the receiving level of the serving cell ƒ Inter-layer HO Thrsh. - Inter-layer HO Hysteresis, then it is 0. Otherwise, it is 1. No matter the neighboring cell and the serving cell lie in the same layer and same level or not, this bit shall be compared with the intra-layer threshold and Hysteresis of the original cell.

Bit No. 15: Cell type adjustment bit (applicable for single timeslot extended cell with the maximum radius being 70kms). For the extended cell, this bit is 1. For normal cells, it is 0.

Bit No. 16: Reserved bit

All the 16 bits are initialized as 0 in sorting. It will be regarded that all the 16 bits are 0 if they are not set 1 in the subsequent judgment. For example, for Bit No.4 “whether neighboring cell hysteresis is greater than the serving cell hysteresis”, if the neighboring cell is in a different hierarchical from the serving cell, Bit No.4 is still 0. If otherwise, Bit No.4 will be assigned with the corresponding value based on the comparison result.

2.4.1 Handover Control Data Table

HO algorithm

Range: Huawei handover algorithm, GSM0508 handover algorithm

Unit -

Default: Huawei handover algorithm

Description: To select handover algorithm.

Note: At present, only Huawei handover algorithm is available.

Min interval for TCH HOs

Range: 1–60

Unit Second

Default: 6

Description: When a new TCH is assigned, a timer should be started. Only when this timer times out will handover be allowed. This parameter is the duration for this timer. This parameter is used to avoid incorrect handover due to inaccurate MRs at the early stage of call establishment. The value of this parameter when MR is pre-processed



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by BTS should be smaller than that when MR is not pre-processed by BTS.

Min interval for SD HOs

Range: 1–60

Unit Second

Default: 2

Description: When a new SDCCH is assigned, a timer should be started. Only when this timer times out will handover be allowed. This parameter is the duration for this timer. This parameter is used to avoid incorrect handover due to inaccurate MRs at the early stage of call establishment. The value of this parameter when MR is pre-processed by BTS should be smaller than that when MR is not pre-processed by BTS.

Min interval for consecutive HOs

Range: 1–60

Unit Second

Default: 6

Description: This parameter is used to prevent consecutive handovers that can result in bad network performance. After BSC sends a handover command, it will start a timer. BSC will not perform any handover before this timer times out. This parameter is the duration for this timer.

Min interval for Emerg. HOs

Range: 1–60

Unit Second

Default: 6

Description: When BSC completes or fails to perform an emergency handover, it will start a timer. BSC will not perform any emergency handover before this timer times out. This parameter is the duration for this timer.

Co-BSC/MSC Adj

Range: Yes, No

Unit -

Default: No

Description: Indicates whether to adjust a candidate cell sorting so that handover in the same BSC/MSC is in priority.



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SD HO allowed

Range: Yes, No

Unit -

Default: No

Description: Determines whether to allow the handover between signaling channels.

Penalty allowed

Range: Yes, No

Unit -

Default: Yes

Description: Indicates whether penalty is given to certain candidate cells, including the target cell that has handover failure history and the cell that has emergency handover history due to too large value of TA or bad quality.

Intra-cell HO allowed

Range: Yes, No

Unit -

Default: No

Description: Determines whether intra-cell handover is allowed. Intra-cell handover includes timeslot and TRX change. Intra-cell handover can reduce the impact of "Rayleigh" fading or interference.

Note: This parameter is invalid for the IUO handover.

Load HO allowed

Range: Yes, No

Unit -

Default: Yes

Description: Indicates whether Traffic load-sharing handover is allowed. Load-sharing can reduce the cell congestion and balance the traffic load for each cell so as to improve network performance. It works only in the same BSC or in cells of the same layer. It is used only for TCH.

Note: Extra interference might be resulted from tight frequency reuse.

MS fast moving HO allowed

Range: Yes, No



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Unit -

Default: No

Description: The fast moving algorithm is a special algorithm to process fast moving MS. This parameter is used to decide whether to use this algorithm.

Rx_Level_Drop HO allowed

Range: Yes, No

Unit -

Default: No

Description: The parameter decides whether to use the emergency handover algorithm when receiving level drops fast.

Note: Generally, this parameter is set to “No”.

This algorithm requires that BTS must send the original MR to BSC.

PBGT HO allowed

Range: Yes, No

Unit -

Default: Yes

Description: Indicates whether to use the PBGT (POWER BUDGET) handover algorithm. PBGT is a handover algorithm based on path loss. It searches a cell in real time which can meet a certain requirements and has smaller path loss, and judge whether to hand over it or not.

To avoid Ping-Pong handover, PBGT handover occurs only between cells of the same layer and triggered only in TCH channel. Proper use of PBGT can reduces the over-cell coverage and co-channel interference.

MS power prediction after HO

Range: Yes, No

Unit -

Default: No

Description: Indicates whether MS is allowed to use optimized power instead of the maximum power to access new channel during handover. If this parameter is set to “Yes”, this can reduce system interference and improve service quality.

MR. Pre-process



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Range: Yes, No

Unit -

Default: No

Description: Indicates whether BTS pre-processes MR. If this parameter is set to "No", it means that MR is processed by BSC. In this case, the parameter Transfer original MR. and Transfer BS/MS Power Class are invalid. If this parameter is set to "Yes", this will reduce the load of Abis interface signaling and also the load of BSC. It also improves response time and network performance. Meanwhile, this parameter determines the place where to perform power control. If this parameter is set to “Yes”, then the power control will be performed by BTS. Otherwise, the power control will be performed by BSC.

Note: 1, MR Pre-process aims to reduce load of BSC MPU. For versions before BTS01.1130, MR Pre-process will be enabled unless busy hour traffic exceeds the theoretic value. For versions after BTS01.1130 (including BTS01.1130), MR Pre-process is advised to be enabled if no encryption is used, but not if otherwise.

2, For BTS22C, this parameter must be set as “No.”.

3, BTS2X (including BTS23 and BTS22C) supports G-I power control instead of G-II power control shift-to BTS.

When setting this parameter, it should be noted that whether BTS supports power control.

4, In 16 K mode, if some TRX configured 2 or more SDCCH, or enabled dynamic SDCCH, it is recommended to enable MR. Pre-process, and the frequency of report configured as 1 time per second.

Transfer original MR.

Range: Yes, No

Unit -

Default: No

Description: Description: Indicates whether to transfer the original MR to BSC after BTS pre-processes MR. When the parameter is set to "Yes", BTS transfer to BSC not only the processed MRs, but also the original MRs.

Note: In the case of 15:1 function, if the number of SDCCH/8s should be greater than or equal to 2, this parameter should be set to “No”.

Transfer BS/MS power class

Range: Yes, No

Unit -

Default: Yes



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Description: Indicates whether to transfer the original BS/MS power class to BSC. If the parameter is set to "No", BTS will not report BS/MS power class to BSC. This will affect the result of uplink and downlink balance measurement.

Note: When MR Pre-process is enabled, the result of uplink and downlink balance measurement will be affected if “Transfer BS/MS power class” is set as “No.”. Besides, such power compensation handovers as PBGT handover, load handover and concentric handover are abnormal.

Sent Freq. of preprocessed MR.

Range: Do not report, Twice every second, Once every second, Once every 2 seconds, Once every 4 seconds

Unit -

Default: Twice every second

Description: Indicates the period of BTS to transfer preprocessed MR to BSC.

Note: In the case of 15:1 function, it is recommended to set this parameter to “Once every second”.

Multi-MNC HO allowed

Range: Y/N

Unit None

Default: N

Description: Controlling whether the multi-MNC handover judgment is allowed. If "N" is selected, the multi-MNC handover judgment will not be performed. The handover processing for the cell of the same MNC will be the same as that for the cell of a different MNC. If "Y" is selected, the multi-handover judgment will be performed. The handover control will be performed according to the selected "Multi-MNC HO type".

For the situation where there are multiple MNCs, it is recommended to configure this parameter with "Y"; otherwise, with "N".

Multi-MNC HO type

Range: Normal handover, only the handover to a cell of the same MNC allowed, a cell of the same MNC first, a better cell of the same MNC first, a better cell of a different MNC first, a cell of a different MNC first, and only the handover to a cell of a different MNC allowed.

Unit None

Default: Normal handover



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Description: When "Multi-MNC HO allowed" is set as "Y", you can determine the multi-MNC handover control strategy according to this parameter.

Each multi-MNC handover control strategy and its application occasion are given below.

1, Normal handover

Control strategy: hand over to a cell providing better service quality (in respect of level, quality, cell class, load and whether the serving cell shares BSC\MSC).

Application occasion: MS is expected to hand over to a cell providing better service quality without regard to whether the destination cell is of the same MNC.

2, Handover to a cell of the same MNC allowed

Control strategy: Only the handover to a cell (including the serving cell) of the same MNC is allowed.

Application occasion: MS is expected to hand over to a cell of the same MNC.

3, Handover to a cell of the same MNC first

Control strategy: If the neighboring cell and the serving cell are of the same MNC, and the receiving level of the neighboring cell is higher than its “Min-DL power on candidate cell”, this neighboring cell will be given priority in handover.

Application occasion: When cells of the same MNC serve normally, MS is expected to hand over to a cell of the same MNC. Otherwise (i.e. MS can not detect signals in cells of the same MNC), MS can hand over to a cell of a different MNC.

4, Handover to a better cell of the same MNC first

Control strategy: If the neighboring cell and the serving cell are of the same MNC, and the receiving level of the neighboring cell is higher than its “Inter-layer HO threshold”, this neighboring cell will be given priority in handover.

Application occasion: When cells of the same MNC serve normally, MS is expected to hand over to a cell of the same MNC. Otherwise, MS can hand over to a cell of a different MNC. If otherwise, MS may hand over to a cell of a different MNC.

5, Handover to a better cell of a different MNC first

Control strategy: If the neighboring cell and the serving cell are of different MNCs, and the receiving level of the neighboring cell is higher than its “Inter-cell HO threshold”, this neighboring cell will be given priority in handover.

Application occasion: When cells of different MNCs serve properly, MS is expected to hand over to a cell of different MNC. Otherwise, MS may hand over to a cell providing better service. This control strategy is selected when well-covered cells of the same MNC are in congestion for lack of channels, and cells of different MNCs is allowed to share the traffic.

6, Handover to a cell of a different MNC first

Control strategy: If the neighboring cell and the serving cell are of different MNCs, and the receiving level of the neighboring cell is



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higher than its “Min-DL power on candidate cell”, this neighboring cell will be given priority in handover.

Application occasion: When cells of different MNCs serve properly, MS is expected to hand over to a cell of a different MNC. Otherwise (i.e. MS can not detect signals in the cell of a different MNC), MS can hand over to a cell of the same MNC. This control strategy is selected when well-covered cells of the same MNC are in congestion for lack of channels, and cells of different MNCs is allowed to share the traffic.

7, Only handover to a cell of a different MNC allowed

Control strategy: MS can only hand over to a cell of a different MNC from the serving cell. .

Application occasion: MS is expected to hand over to a cell of different MNCs.

EDGE HO Allowed

Range: Yes, no

Unit: -

Default: No

Description Used to determine whether use the EDGE HO algorithm or not

EDGE HO min time (s)

Range: 3~60

Unit: s

Default: 3

Description Used to determine the minimum handover time after EDGE service begins

2.4.2 Cell Description Table

Cell No.

Range: 0–255

Unit: -

Default: -



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Description: Cell index.

Note: “Cell No” in the Cell Description Table ranges from 0 to 255. For any cells with Cell No. beyond 255, no request for handover to these cells will be sent.

Layer of the cell

Range: 1–4, which are respectively corresponding to the PICO layer, MICRO layer, MACRO layer, and UMBRELLA layer

Unit Layer

Default: 3

Description: The whole network can be divided into 4 layers: Umbrella, Macro, Micro, and Pico. Each layer can be set with 16 priorities. This meets the requirements of various complex networking environments. Generally, the Macro layer is used for main 900, Micro for main 1800, and Pico layer for 900 and 1800 microcell. The smaller the layer value, the higher the priority.

Cell priority

Range: 1–16

Unit Grade

Default: 1

Description: See the description of the parameter Layer of the Cell. This parameter is used to set the handover priority of the cells in the same layer. Generally, the priority of the cells in the same layer should be the same. For the cells on the same layer, the smaller the priority value, the higher the priority.

Inter-layer HO Thrsh.

Range: 0–63. (-110 dBm–-47 dBm)

Unit dB

Default: 25

Description: The threshold for inter-layer Hierarchical Handover. This threshold should satisfy the following requirement: Inter-layer HO Thrsh. ≥ Edge HO RX_LEV Thrsh. + Inter-cell HO hysteresis.

Notes: Make sure that the receiving level of the destination cell is higher than inter-layer HO threshold in hierarchical handover or load handover. Otherwise, MS hands over from large load high level cell (high priority cell) to small load low level cell (low priority cell), and MS is disconnected as a result.



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Inter-layer HO hysteresis

Range: 0–63

Unit dB

Default: 3

Description: Indicates the hysteresis for inter-layer or inter-priority handover. It is used to avoid inter-layer Ping-Pong handover. Actual Inter-layer HO Thrsh. of serving cell = value of Inter-layer HO Thrsh. - Inter-layer HO hysteresis. Actual Inter-layer HO Thrsh. of neighboring cell = value of Inter-layer HO Thrsh. + Inter-layer HO hysteresis.

Penalty on fast moving HO

Range: 0–63

Unit dB

Default: 30

Description: When MS is moving fast in Umbrella layer, the penalty will be given to other neighboring cells in other layers. This parameter determines the penalty level value. This parameter is valid only for the duration of “Penalty Time on Fast Moving HO”

Penalty time on fast moving HO

Range: 0–255

Unit Second

Default: 40

Description: The duration of penalty given to the neighboring cells when MS is in fast moving state.

Min DL level on candidate cell

Range: 0–63. (-110dBm–-47dBm).

Unit Grade

Default: 15

Description: The minimum downlink receiving level required for the cell itself to be the candidate cell.

Note: 1. This parameter can affect the handover success rate. MIN DL power on handover candidate cell must be greater than the receiving level of this cell. Otherwise, handover failure occurs.

2. The cell can enters into the candidate cell list only when its receiving level is greater than the sum of the min DL level on candidate cell and the min access level offset.



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MS_TXPWR_MAX_CCH

Range: 0–31

Unit -

Default: 5(900M), 0(1800M)

Description: The maximum MS transmitting power level during handover access.

This parameter is mainly used for the judgment of the M criterion for MS in the dedicated mode. The M criterion determines whether a neighboring cell of MS can become a candidate cell. Its judgment is similar to the C1 criterion for cell selection. M="MS receiving level" - "Min DL level on candidate cell " – MAX (("MS_TXPWR_MAX_CCH" - "Min Access Level Offset"), 0) - "minimum access level offset". Only when M≥ 0 can the neighboring cell become a candidate cell.

Note: It is recommended the power levels of cells in GSM900 and GSM1800 corresponding to different dBm values. The 32 maximum transmitting power levels for GSM900 are:

{39, 39, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5,5, 5, 5, 5}

The 32 maximum transmitting power levels for GSM1800 are:

{30,28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 34, 32}

UL expected level at HO access

Range: 0–63. (-110 dBm–-47 dBm)

Unit Grade

Default: 35

Description: Indicates the expected uplink receiving level on a target channel when MS hands over. The value of this parameter should be consistent with the "Stable RX_LEV Expected" in conjunction with the power control algorithm and the "UL RX_LEV upper Thrsh." in conjunction with the HW II power control algorithm.

Cell type

Range: Normal cell, concentric cell

Unit -

Default: Normal cell

Description: Whether it is IUO cell.



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2.4.3 External Cell Description Table

External cell No.

Range: 0–799

Unit

Default:

Description:

External cell index

“Cell No” in the Cell Description Table ranges from 0 to 255. For any cells with Cell No. beyond 255, no request for handover to these cells will be sent.

“External cell No” in the External Cell Description Table ranges from 0 to 799. For any cells with Cell No. beyond 799, no request for handover to these cells will be sent.

MSC shared or not

Range: Yes, No.

Unit:

Default: set based on actual situation

Description: Whether the external cell shares MSC with the current BSC.

Note: 1. In the external cell description table, the cell number ranges from 0 to 799.

2. The parameter “MSC shared or not” affects the sequencing of the cell in the 13th bit in the 16bit rule. Therefore, the improper setting of this parameter may lead to handover failure.

See the [Cell Description Table].

2.4.4 Neighboring Cell Relation Table

Ncell ID

Range: 0–255 for internal cells, and 0–799 for external cells.

Unit -

Default: -

Description: The index number of a neighboring cell. Used to index the cell description data table and external cell description data table.

PBGT HO Thrsh.



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Range: 0–127, corresponding to -64 dB – +63 dB

Unit -

Default: 68 for popular urban areas, 72 for suburbs.

Description: A threshold in PBGT handover algorithm used to judge whether to perform PBGT handover. When “PBGT Handover Allowed” is set to “Yes” and "Inter-cell HO hysteresis"> "PBGT HO Thrsh.”, the "Inter-cell HO hysteresis" will act instead of the "PBGT HO Thrsh." When this parameter is assigned with a value smaller than 64, MS can hand over to a lower level neighboring cell.

Note: When PBGT handover is enabled, and “Inter-cell HO hysteresis” > “PBGT HO Thrsh”, the "Inter-cell HO hysteresis" instead of the "PBGT HO Thrsh” works. "PBGT HO Thrsh” must be adjusted as per handover performance statistic result and actual network.

Inter-cell HO hysteresis

Range: 0–63

Unit dB

Default: 4 dB populous urban areas and 8 dB for suburbs.

Description: Indicates the handover hysteresis between neighboring cells of the same layer. The purpose of setting this parameter is to reduce the “Ping-Pong” handovers. The value of this parameter is invalid if cells are not on the same layer.

Min access level offset

Range: 0–63

Unit dB

Default: 0

Description: This offset is based on the "Min DL level on Candidate Cell". For different neighboring cells, different offsets can be defined. Only when the receiving level of a neighboring cell ≥ "Min DL Level on Candidate Cell" + this offset then this cell become a candidate cell.

2.4.5 Filter Data Table

Allowed MR number lost

Range: 0–32

Unit Number of MRs

Default: 4



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Description: Indicates the number of MRs allowed losing during interpolation processing. If the number of MRs lost continuously is less than this value, the last MR received before the lost MRs and the next to the lost MRs will be averaged. The averaged value is regarded as the lost MR. Otherwise, all previous MRs are discarded, and calculations are made again when new MRs are received.

Note: MRs will lose continuously if the active cell does not serve well. Once the number of MRs lost continuously is greater than this parameter value, all previous MRs will be discarded and handover can not be realized. Therefore, it is advised to assign the parameter with a greater value to enable emergency handover.

Filter length for TCH level

Range: 1–32

Unit -

Default: 6

Description: Indicates the number of MRs to be used to do TCH signal strength averaging calculation. When the filtering window is set to be too large, the impact of sudden change will be reduced, as well as the response speed for this kind of sudden change will be slower.

Filter length for TCH Qual.

Range: 1–32

Unit -

Default: 6

Description: Indicates the number of MRs to be used to do TCH signal quality averaging calculation. When the filtering window is set to be too large, the impact of sudden change will be reduced, as well as the response speed for this kind of sudden change will be slower.

See the following table for reference about the relation between quality class and BER.

Quality class BER

0 Less than 0. 2%

1 0.2% to 0.4%

2 0.4% to 0.8%

3 0.8% to 1.6%

4 1.6% to 3.2%

5 3.2% to 6.4%

6 6.4% to 12.8%

7 Greater than 12.8%



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Filter length for SD level

Range: 1–32

Unit -

Default: 3

Description: Indicates the number of MRs to be used to do SDCCH signal strength averaging calculation. The SDCCH occupation time by MS is shorter than the TCH occupation time. So the value of this parameter should be less than that of “Filter Length for TCH Level”.

Filter length for SD Qual

Range: 1–32

Unit -

Default: 3

Description: Indicates the number of MRs to be used to do SDCCH signal quality averaging calculation. The SDCCH occupation time by MS is shorter than the TCH occupation time, so the value of this parameter should be less than that of “Filter Length for TCH Qual.”

Filter length for Ncell RX_LEV

Range: 1–32

Unit -

Default: 6

Description: Indicates the number of MRs to be used to do neighboring cells signal strength averaging calculation. When the filter window is set to be too large, the impact of sudden change will be reduced, as well as the response speed for this kind of sudden change will be slower.

Filter length for TA

Range: 1–32

Unit -

Default: 6

Description: Indicates the number of MRs to be used to do TA averaging calculation

2.4.6 Penalty Table

Penalty level after HO fail.

Range: 0–63



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Unit dB

Default: 30

Description: After the handover fails due to target cell congestion and other reasons (i.e. internal handover refuse message is received; or Um interface handover failure message is received in out-going BSC handover; or Um interface handover failure message is received in internal handover), a penalty will be given to this cell in order to avoid retry to hand over to this cell. This parameter is the penalty of signal level to be given. This penalty is valid only during the duration of “Penalty time after HO fail”.

Penalty time after HO fail

Range: 0–60

Unit Second

Default: 10

Description: See the description of “Penalty level after HO fail”. This parameter indicates the duration for penalty.

Penalty level after BQ HO Fail.

Range: 0–63

Unit dB

Default: 63

Description: When the emergency handover to a cell and the emergency handover fails; in order to avoid handing over back to this cell and "Ping-Pong" handover, a signal level penalty will be given to this cell. This parameter is the penalty of signal level to be given. This penalty is valid only during the duration of “Penalty time after BQ HO Fail.”

Penalty time after BQ HO Fail.

Range: 0–60

Unit Second

Default: 10

Description: See the description of “Penalty level after BQ HO Fail.”. This parameter indicates the duration for penalty.

Penalty time after TA HO Fail

Range: 0–63

Unit dB

Default: 63



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Description: When the emergency handover due to too great TA value in a cell and the emergency handover fails; In order to avoid handing over back to this cell and "Ping-Pong" handover, a signal level penalty will be given to this cell. This parameter is the penalty of signal level to be given. This penalty is valid only during the duration of “Penalty time after TA HO Fail”

Penalty time after TA HO Fail.

Range: 0–60

Unit Second

Default: 10

Description: See the description of “Penalty level after TA HO Fail.”. This parameter indicates the duration for penalty.

Penalty time after IUO HO Fail.

Range: 0–16

Unit Second

Default: 10

Description: After an IUO handover failure, regardless of handover from UnderLaid subcell to OverLaid subcell or from OverLaid subcell to UnderLaid subcell, IUO handover will be forbidden within a period of time. This parameter indicates this duration.

2.4.7 Emergency Handover Table

Note: To speed up the system response in HW_II handover algorithm, the target cell for emergency handover is selected only according to the cell sorting, regardless of P/N.

TA Thrsh.

Range: 0–255

Unit bit period

Default: 63(Normal cell), 219(Dual timeslot extension cell)

Description: Emergency handover is triggered once TA is equal to or greater than this value.

DL Qual. Thrsh.

Range: 0–70, corresponding to RQ (quality level 0–7) × 10



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Unit -

Default: 60

Description: Indicates the downlink receiving quality threshold in order to trigger emergency handover due to the bad quality. When frequency hopping or DTX is used, it is recommended to set the value of this parameter to 70. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the “Intra-cell HO allowed” is “Yes” will the intra-cell handover be triggered.

UL Qual. Thrsh.

Range: 0–70, corresponding to RQ (quality level 0 – 7) × 10

Unit -

Default: 60

Description: Indicates the uplink receiving quality threshold in order to trigger emergency handover due to the bad quality. When frequency hopping or DTX is used, it is recommended to set the value of this parameter to 70. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the “Intra-cell HO allowed” is “Yes” will the intra-cell handover be triggered.

UL Qual. Thrsh. for interf. HO


Unit -

Default: 50

Description: Indicates the uplink receiving quality threshold in order to trigger emergency handover due to interference. When frequency hopping or DTX is used, it is recommended to set the value of this parameter to 60. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the “Intra-cell HO allowed” is “Yes” will the intra-cell handover be triggered.

DL Qual. Thrsh. for interf. HO


Unit -

Default: 50

Description: Indicates the downlink receiving quality threshold in order to trigger emergency handover due to interference. When frequency hopping or DTX is used, it is recommended to set the value of this parameter to 60. When an emergency handover is triggered, the first-choice target



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cell is other cell. Only when there is no other cell serving as candidate cell and the “Intra-cell HO allowed” is “Yes” will the intra-cell handover be triggered.

Note: The follows should be satisfied:

DL Qual. Thrsh.> DL Qual. Thrsh. for interf. HO and UL Qual. Thrsh.> UL Qual. Thrsh. for interf. HO

UL RX_LEV Thrsh. for interf. HO

Range: 0–63. (-110 dBm–-47 dBm)

Unit Grade

Default: 25

Description: Only when the RX_Quality is very bad and the RX_Level exceed a certain threshold will the system regard there is interference. This parameter indicates that the threshold for uplink RX_Level. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the “Intra-cell HO allowed” is “Yes” will the intra-cell handover be triggered.

DL RX_LEV Thrsh. for interf. HO

Range: 0–63. (-110 dBm–-47 dBm)

Unit Grade

Default: 30

Description: Only when the RX_Quality is very bad and the RX_Level exceed a certain threshold will the system regard there is interference. This parameter indicates the threshold for downlink RX_Level. When an emergency handover is triggered, the first-choice target cell is other cell. Only when there is no other cell serving as candidate cell and the “Intra-cell HO allowed” is “Yes” will the intra-cell handover be triggered.

Uplink level SHTM filter length

Range: 0–20

Unit -

Default: 3

Description: This parameter defines the uplink level filter length in short term.

Filter parameters A1–A8

Range: 0–20

Unit -

Default: 10



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Description: Parameters for level fast drop filter, totally 9 parameters, including the filter parameter B. The actual values of A1 – A8 = (A1–A8)–10. The actual parameter B value = minus value of the B value is set. Their working formula is as follows:

C1 (nt) = A1 % C(nt) + A2 % C(nt-t) + A3 % C(nt-2t) + … + A8 % C(nt-7t), where:

C (nt) is the uplink RX_Level of the serving cell in the MR received at the time of “nt”.

If C1 (nt) <B, and C(nt) is below the “Edge HO RX_LEV Thrsh.”, then the signal level is regarded to be fast deteriorating.

Filter parameter B

Range: 0–255

Unit -

Default: 0

Description: Used for the fast drop filter.

MIN TA

Range: 0–63

Unit Bit period

Default: 0

Description: In a single timeslot extended cell, MS can hand over from UnderLaid subcell to OverLaid subcell only when its TA is less than a certain threshold. This parameter indicates this threshold.

2.4.8 Load Handover Data Table

System flux Thrsh. for load HO

Range: 0, 8–11; its corresponding percentage values: 0, 70, 80, 90, 95

Unit Flow grade

Default: 10

Description: The load handover occurs only when the system load is lower than a certain threshold. This parameter indicates the threshold. The value of this parameter cannot be too great.-Unexpected consequence might –occur when the system load is very high.

Load HO Thrsh.

Range: 0–7. Its corresponding percentage values: 0, 50, 60, 70, 75, 80, 85, 90



2-85

Unit Load grade

Default: 7

Description: The load handover will be triggered when the load of a cell exceeds “Load HO Thrsh.”. The value of this parameter corresponds to TCH occupancy percentage.

Note: Even if load handover is not active, such parameters as “Load HO Thrsh” and “Load HO Receiving Thrsh” will affect the sequence of candidate cells (BIT No.11 of 16 Bit criterions). Therefore, improper setting of this parameter will result in PBGT handover (and other handovers) failure when cell load is heavy.

Load Req. on candidate cell

Range: 0–7. Its corresponding percentage values: 0, 50, 60, 70, 75, 80, 85. 90

Unit Load grade

Default: 5

Description: The target cell is able to receive the handovers from other cells only when the load of the target cell is lower than “Load Req. on candidate cell”. Otherwise, this cell refuses any handover request from other cells.

Note: Even if load handover is not active, such parameters as “Load HO Thrsh” and “Load HO Receiving Thrsh” will affect the sequence of candidate cells (BIT No.11 of 16 Bit criterions). Therefore, improper setting of this parameter will result in PBGT handover (and other handovers) failure when cell load is heavy.

Load HO bandwidth

Range: 0–63

Unit dB

Default: 25

Description: This parameter works together with other parameters to determine whether the handover is allowed. Only when the RX_Level of the serving cell is within the range of {Edge HO RX_LEV Thrsh., Edge HO RX_LEV Thrsh. + Load HO bandwidth} then the handover will be allowed.

Load HO step period

Range: 1–60

Unit Second

Default: 10

Description: When a cell is qualified for handover, handover requests might be sent for all connections simultaneously. It will cause a sudden increase of CPU load and call-drop due to the congestion of the target cell. Therefore, these requests will be divided into bands based on the



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receiving strength. For example, band1 is within the range {Edge HO RX_LEV Thrsh., Edge HO RX_LEV Thrsh. + Load HO step period}; band2 is within the range {Edge HO RX_LEV Thrsh. + Load HO step period, Edge HO RX_LEV Thrsh. + 2 × Load HO step period}, and so on. Handovers are performed band by band from the edge to the inner.

Load HO step level

Range: 1–60

Unit dB

Default: 5

Description: This parameter indicates the interval between two different handover bands. See the description of “HO step level”.

2.4.9 Normal Handover Data Table

Edge HO UL RX_LEV Thrsh.

Range: 0–63. (-110 dBm–-47 dBm)

Unit Grade

Default: 25 for urban areas without PBGT handover being enabled, urban)

20 for remote suburbs

20 for urban areas with PBGT handover being enabled

Description: Edge handover uplink receiving level threshold. The edge handover will be triggered if the uplink receiving level is constantly lower than “Edge HO UL RX_LEV Thrsh.” within a period of time. If “PBGT HO allowed” is set to “Yes”, the corresponding edge handover threshold will be lowered. In the case that “PBGT HO allowed” is set to “No”, too low value of the Edge HO UL RX_LEV Thrsh is likely to cause overlapping coverage and co-channel interference.

Note:

1, Edge handover (uplink) downlink receiving level threshold < (uplink) downlink signal strength lower limit of G-II power control.

2, Edge handover (uplink) downlink receiving level threshold < expected stable (uplink) downlink signal strength of G-I power control.

Edge HO DL RX_LEV Thrsh

Range: 0–63. (-110 dBm–-47 dBm)

Unit Grade

Default: 30 for urban areas without PBGT handover being enabled



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25 for remote suburbs

25 for urban areas with PBGT handover being enabled

Description: Edge handover downlink receiving level threshold. The edge handover will be triggered if the downlink receiving level is constantly lower than “Edge HO DL RX_LEV Thrsh.” within a period of time. If “PBGT HO allowed” is set to “Yes”, the corresponding edge handover threshold will be lowered. In the case that “PBGT HO allowed” is set to “No”, too low value of the Edge HO DL RX_LEV Thrsh. is likely to cause overlapping coverage and co-channel interference.

Note: 1, Edge handover (uplink) downlink receiving level threshold < (uplink) downlink signal strength lower limit of G-II power control.

2, Edge handover (uplink) downlink receiving level threshold < expected stable (uplink) downlink signal strength of G-I power control.

Edge HO watch time

Range: 1–16

Unit: Second

Default: 5

Description: The uplink and downlink receiving levels are measured within “Edge HO watch time” so as to determine whether the edge handover is triggered.

Edge HO valid time

Range: 1–16

Unit: Second

Default: 4

Description: To trigger an edge handover, the receiving level of the uplink or downlink should constantly remain lower than their corresponding edge handover thresholds -y within a period of time. This parameter indicates this duration.

PBGT watch time

Range: 1–16

Unit: Second

Default: 5

Description: The path losses of adjacent cells and the serving cell are compared with “PBGT watch time” so as to determine whether the PBGT handover is triggered.



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PBGT valid time

Range: 1 – 16

Unit: Second

Default: 4

Description: The PBGT handover will be triggered when the path loss of adjacent cells – the path loss of the serving cell > PBGT HO Thrsh. lasts “PBGT valid time”.

Intracell TCHF-TCHH handover statistics time

Range: 1 – 16

Unit: second

Default: 5

Description: According to the P/N rule, system judges whether to implement the handover based on the RQI of the measurement report. If within P seconds in N seconds, the RQI is higher than the handover threshold from TCHF to TCHH, the handover from TCHF-TCHH is triggered. If within P seconds in N seconds, the RQI is lower than the handover threshold from TCHH-TCHF, the handover from TCHH to TCHF is triggered. Here, the ”N seconds” is the intracell TCHF-TCHH handover statistics time. ”P seconds” is the intracell TCHF-TCHH handover observe time.

Intracell TCHF-TCHH handover lasting time

Range: 1 – 16

Unit: second

Default: 4

Description: Within the intracell TCHF-TCHH handover statistics time, the lasting time that the RQI is higher than the handover threshold from TCHF to TCHH or lower than the handover threshold from TCHH to TCHF.

Handover threshold from TCHF to TCHH

Range: 0 – 39

Unit none

Default: 30

Description: Within a specified time, if the C/I of the TCHH is higher than the threshold value, the handover is triggered.

Handover threshold from TCHH to TCHF

Range: 0 – 39



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Unit none

Default: 10

Description: Within a specified time, if the C/I of the TCHH is lower than the threshold value, the handover is triggered.

Layer HO watch time

Range: 1 – 16

Unit Second

Default: 5

Description: See the description of “PBGT watch time”. This parameter is used for inter-layer handover decision.

Layer HO valid time

Range: 0 – 16

Unit Second

Default: 4

Description: See the description of “PBGT valid time”. This parameter is used for inter-layer handover decision.

2.4.10 MS Fast Moving HO Data Table

MS Fast-moving Watch cells

Range: 1 – 10

Unit -

Default: 3

Description: The number of cells used to judge whether MS is in fast moving state. It is not good for the system load to decrease effectively if this parameter value is too great, but too small the value will cause inaccurate judgment.

MS Fast-moving Valid cells

Range: 1 – 10

Unit -

Default: 2

Description: This parameter works together with “MS Fast-moving Watch cells”. When an MS has achieved the value set in “MS Fast-moving Watch cells”, and if there are “MS Fast-moving Valid cells” that are crossed



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fast. In this case, fast moving handover will be triggered.

MS Fast-moving time Thrsh.

Range: 0–255

Unit Second

Default: 15

Description: If the time of MS spent on crossing a cell is lower than “MS Fast-moving time Thrsh. “, the MS will be regarded as moving fast.

Note: Terms to trigger fast-moving handover:

1, Serving cell is not level-4.

2, Destination cell is level-4.

2.4.11 Intra-cell Handover Data Table

MAX consecutive HO times

Range: 1–20

Unit -

Default: 3

Description: If the interval of two continuous intra-cell handovers is less than “Interval for consecutive HO Jud.” these two handovers will be regarded as consecutive intra-cell handovers. If the number of consecutive intra-cell handovers exceeds “MAX consecutive HO times”, intra-cell handover will be forbidden within “Forbidden time after MAX times”

Forbidden time after MAX times

Range: 1–200

Unit Second

Default: 20

Description: See the description of “MAX consecutive HO times”.

Interval for consecutive HO Jud.

Range: 1–200

Unit Second

Default: 6

Description: See the description of “MAX consecutive HO times”.



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2.4.12 GSM0508 Handover Table

The GSM0508 handover algorithm is not recommended, and this table is unnecessary to configure.

2.4.13 Concentric Cell Handover Table

Direction for IUO HO – UL to OL HO Allowed

Range: Yes/No

Unit None

Default: Yes

Description: Used to determine whether the handover is performed from UnderLaid subcell to OverLaid subcell.

Direction for IUO HO – OL to UL HO Allowed

Range: Yes/No

Unit None

Default: Yes

Description: Used to determine whether the handover is performed from OverLaid subcell to UnderLaid subcell.

Criterion for IUO HO – Rx_Lev for UO HO Allowed

Range: Yes/No

Unit None

Default: Yes

Description: Used to determine whether the receiving level of downlink is taken as the judgment condition in the IUO handover judgment.

Criterion for IUO HO – Rx_Qual for UO HO Allowed

Range: Yes/No

Unit None

Default: Yes

Description: Used to determine whether the receiving quality of downlink is taken as the judgment condition in the IUO handover judgment.

Criterion for IUO HO – TA UO HO Allowed



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Range: Yes/No

Unit None

Default: Yes

Description: Used to determine whether TA is taken as the judgment condition in the IUO handover judgment.

UO signal intensity difference

Range: 0–63

Unit dB

Default: 5,

Description: Used to compensate the intensity difference between OverLaid subcell and UnderLaid subcell.

The parameter is invalidation while the "Enhanced IUO Allowed" is set as "Yes".

Note: Intensity difference between OverLaid subcell and UnderLaid subcell = Power amplification power difference between OverLaid subcell and UnderLaid subcell + combiner insertion loss difference + path loss difference caused by different antennas + path loss difference caused by different frequencies selected. The receiving levels of both OverLaid subcell and UnderLaid subcell should be measured on site, and the measurement should be performed on multiple sites if different antennas are used in OverLaid subcell and UnderLaid subcell.

RX-LEV Thrsh.

Range: 0–63. (-110 dBm–-47 dBm)

Unit Grade

Default: 35

Description: When the "Enhanced IUO Allowed" is set as "No", RX-LEV Thrsh. works together with RX-LEV Hysteresis, RX-qual Thrsh, TA Thrsh. and TA hysteresis. This is to determine the boundary between OverLaid subcell and UnderLaid subcell. The value of this parameter must be greater than the “Edge HO Thrsh”. It is recommended that RX-LEV Thrsh. > Edge HO Thrsh. + UO Signal Intensity Difference.


RX-LEV Hysteresis

Range: 0–63

Unit dB

Default: 5



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Description: When the "Enhanced IUO Allowed" is set as "No", RX-LEV Hysteresis works together with RX-LEV Thrsh. RX-LEV Hysteresis, RX-qual Thrsh, TA Thrsh. and TA hysteresis. This is to determine the boundary between OverLaid subcell and UnderLaid subcell.


Receiving Quality Thrsh.

Range: 0–70

Unit None

Default: 60

Description: When the "Enhanced IUO Allowed" is set as "No", One of the parameters for determining the coverage of UnderLaid subcell and OverLaid subcell together with RX_LEV Thrsh., RX_LEV Hysteresis, TA Thrsh, and TA Hysteresis.

When the "Enhanced IUO Allowed" is set as "Yes", One of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell together with RX-qual Thrsh , U to O HO received level Thrsh., O to U HO received level Thrsh., TA Thrsh, and TA Hysteresis.

TA Thrsh.

Range: 0~255

Unit Bit period. 1 bit period corresponds to 0.55 km

Default: 63 (TA threshold is not used to distinguish the boundary between OverLaid subcell and UnderLaid subcell)

Description: When the "Enhanced IUO Allowed" is set as "No", TA Thrsh. works together with RX-LEV Thrsh., RX-qual Thrsh, RX-LEV Hysteresis, and TA hysteresis. This is to determine the boundary between OverLaid subcell and UnderLaid subcell.

When the "Enhanced IUO Allowed" is set as "Yes", One of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell together with U to O HO received level Thrsh., O to U HO received level Thrsh., RX-qual Thrsh, TA Hysteresis.

The value of this parameter must be smaller than TA Thrsh.

TA hysteresis

Range: 0–63

Unit bit period, 1 bit period corresponding to 0.55 km

Default: 0

Description: When the "Enhanced IUO Allowed" is set as "No", TA hysteresis



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works together with RX-LEV Thrsh., RX-LEV Hysteresis, RX-qual Thrsh and TA Thrsh. This is to determine the boundary between OverLaid subcell and UnderLaid subcell.

When the "Enhanced IUO Allowed" is set as "Yes", One of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell together with U to O HO received level Thrsh., O to U HO received level Thrsh., RX-qual Thrsh , TA Thrsh .

Note: The above 5 parameters determine the coverage range of OverLaid subcell and UnderLaid subcell for common IUO.

OverLaid subcell coverage range can be indicated as follows:

Receiving level >= RX-LEV Thrsh. + RX-LEV Hysteresis; TA <= TA Thrsh.- TA hysteresis ,and Receiving quality<RX-QUAL Thrsh.

UnderLaid subcell coverage range can be indicated as follows:

Receiving level <= RX-LEV Thrsh. - RX-LEV Hysteresis; -TA >= TA Thrsh. + TA hysteresis and Receiving quality>=RX-QUAL Thrsh.

There is a hysteresis band between OverLaid subcell and UnderLaid subcell which is used to avoid “Ping-Pong” handovers (as shown below).

RX-LEV Thrsh. - RX-LEV Hysteresis <= Receiving level <= RX-LEV Thrsh. + RX-LEV Hysteresis and TA Thrsh. - TA hysteresis <= TA <=TA Thrsh. + TA hysteresis

If the TA Thrsh. is 63, and the TA Hysteresis is 0, then the boundary of the OverLaid subcell is completely determined by the receiving level parameters.

If the RX-LEV Thrsh. is 63, and the RX-LEV Hysteresis is 0,then the boundary of the UnderLaid subcell is completely determined by the TA parameters.

UO HO watch time

Range: 0–16

Unit Second

Default: 5

Description: See the description of “PBGT watch time”. This parameter is used for IUO handover” decision.

UO HO valid time

Range: 0–16

Unit Second

Default: 4

Description: See the description of “PBGT valid time”. This parameter is used for IUO handover decision.



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Assign optimum layer

Range: System optimization, UnderLaid subcell, OverLaid subcell, No preference

Unit -

Default: When "Cell system type" is set as "GSM900/GSM1800", the default is "Underlaid subcell"; When "Cell system type" is not set as "GSM900/GSM1800", the default is "System optimization"

Description: In the IUO cell, assign styles following:

1) System optimization mode indicate the system selects the optimum layer for TCH assignment as according to MRs provided through the UL’s SDCCH

2) UnderLaid Subcell: UnderLaid Subcells are assigned first;

3) OverLaid Subcell: OverLaid Subcells are assigned first.

4) No preference: no specified instruction.

Assign-Optimum-Level Thrsh.

Range: 0–63,(-110 dBm–-47 dBm)

Unit dBm

Default: 35

Description: After selection of optimal layer, the current SDCCH level can be estimated (inserted/ filtered) as per the uplink measurement result in the previous SDCCH MR. OverLaid subcells and UnderLaid subcells are allocated as per the comparison result between the receiving level of SDCCH and “Assign-Optimum-Level Thrsh”, and that between TA and “Assign-Optimum-TA Thrsh”. That is, MS will be allocated with UnderLaid Subcell only if the receiving level is greater than “Assign-Optimum-Level Thrsh”, and TA smaller than “Assign-Optimum-TA Thrsh”. Otherwise, MS are allocated with OverLaid cells to ensure the successful assignment.

Note: If SDCCH is on an external circle: this thrsh. = edge handover threshold +internal/external circle signal strength difference + balanced uplink/downlink margin + SDCCH and TCH differential margin. If SDCCH is on an internal circle: this thrsh. (Temporarily set as 25) = edge handover threshold + uplink/downlink balanced margin + SDCCH and TCH differential margin.

Assign-Optimum-TA Thrsh

Range: 0–255

Unit

Default: 63

Description: After selection of optimal layer, the current SDCCH level can be estimated (inserted/ filtered) as per the uplink measurement result in



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the previous SDCCH MR. OverLaid subcells and UnderLaid subcells are allocated as per the comparison result between the receiving level of SDCCH and “Assign-Optimum-Level Thrsh”, and that between TA and “Assign-Optimum-TA Thrsh”. That is, MS will be allocated with UnderLaid Subcell only if the receiving level is greater than “Assign-Optimum-Level Thrsh”, and TA smaller than “Assign-Optimum-TA Thrsh”. Otherwise, MS are allocated with OverLaid cells to ensure the successful assignment.

Note:

When the “Assign-Optimum-TA Thrsh” is set as “0”, the UnderLaid subcell cannot be allocated to MS because no TA is smaller than the TA threshold. In this case, the OverLaid subcell is the assignment optimum layer.

TA pref. Of Imme-Assign Allowed


Unit -

Default: No (0)

Description: It determinates whether the system allocates channel according to ACCESS_DELAY in CHANNEL_REQUEST message.

If it is set as "No", system prefer the channel in Underlaid subcell; if it is set as "No", system prefer the channel in overlaid subcell while ACCESS_DELAY is less than "TA Thrsh. Of Imme- Assign pref.", otherwise prefer the channel in Underlaid subcell.

TA Thrsh. Of Imme- Assign pref.

Range: 0–255

Unit -

Default: 60 for double timeslots extended cell

0 for others

Description: While the TA pref. Of Imme-Assign Allowed is set as "Yes" and the ACCESS_DELAY in CHANNEL REQUEST message is less than "TA Thrsh. Of Imme- Assign pref.", system will prefer the channel in overlaid subcell, otherwise prefer the channel in underlaid subcell.

Pref. subcell in HO of intra-BSC

Range: System Optimization, OverLaid Subcell, UnderLaid Subcell, No Preference

Unit -

Default: System Optimization

Description: The incoming HO intra-BSC optimum algorithm allowed. When a cell is configured as an IUO cell, the four processing methods of incoming intra-BSC handover request in BSC are



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1) System Optimization, Add the receiving level of the target IUO cell with the handover request. Then the target cell compares the receiving level with RX_LEV Thrsh. to select the optimum layer, without regard to RX_LEV Hysteresis.

2) UnderLaid Subcell: UnderLaid Subcells are assigned first;

3) OverLaid Subcell: OverLaid Subcells are assigned first.

4) No priority: Channels are allocated based on normal algorithm without specified instruction.

Incoming-to-BSC HO optimum layer

Range: UnderLaid subcell, OverLaid subcell, No preference

Unit -

Default: UnderLaid subcell

Description: Generally, the inter-BSC handover is triggered at the edge of a cell. In this case, the UnderLaid subcell can be selected preferably. In the case of 1800 and 900 that share the same site location, the inter-BSC handover is hardly triggered at the edge of a cell. The OverLaid subcell can be selected preferably. If the handover success rate is low, it is recommended that the UnderLaid subcell should be selected preferably.

Note: BCCH carrier must be configured as UnderLaid subcell.

1) The carrier with SDCCH must be configured as UnderLaid subcell.

2) The handover between OverLaid and UnderLaid subcells will be forbidden If both RX-LEV Thrsh. and RX-LEV Hysteresis are 63.

3) The handover between OverLaid and UnderLaid subcells will be forbidden If both TA Thrsh. and TA Hysteresis are 63.

4) The dual timeslot extended cell adopts IUO for data configuration. See the reference for dual timeslot extended cell.

Enhanced IUO allowed


Unit -

Default: Yes (0)

Description: It determinates whether the cell support enhanced IUO.

O to U HO received level Thrsh.

Range: 0–63 (-110 dBm – -47 dBm)

Unit -

Default: 25



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Description: When the "Enhanced IUO Allowed" is set as "Yes", one of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell for enhanced IUO together with RX-qual Thrsh , U to O HO received level Thrsh., O to U HO received level Thrsh., TA Thrsh, and TA Hysteresis.

U to O HO received level Thrsh.

Range: 0–63 (-110 dBm –- +47 dBm)

Unit -

Default: 35

Description: When the "Enhanced IUO Allowed" is set as "Yes", one of the parameters for determining the coverage of Underlaid subcell and OverLaid subcell for enhanced IUO together with RX-qual Thrsh , U to O HO received level Thrsh., O to U HO received level Thrsh., TA Thrsh, and TA Hysteresis.

Note:

The coverage of OverLaid subcell of enhanced IUO: Receive Level >= U to O HO received level Thrsh. and TA<(TA Thrsh. - TA Hysteresis) and Receive Quality < RX-qual Thrsh The coverage of Underlaid subcell of enhanced IUO: Receive Level < O to U HO received level Thrsh. or TA >=(TA Thrsh. + TA Hysteresis) or Receive Quality >=RX-qual Thrsh There is an "empty" area between Overlaid subcell and Underlaid subcell described by the above formula, the area is the hysteresis area of IUO, it is used to prevent ping-pong handover. The range of empty area is restricted by the follow formula. O to U HO received level Thrsh. <= Receive Level < U to O HO received level Thrsh. and (TA Thrsh. - TA Hysteresis) <= TA < (TA Thrsh. + TA Hysteresis)

U to O Traffic HO Allowed


Unit -

Default: Yes (0)

Description: It determines whether the traffic in underlaid subcell is one of conditions for underlaid to overlaid handover.

If it is set as "Yes", and the traffic in underlaid subcell is over "Traffic Thrsh. of underlay", MS will hand over from underlaid to overlaid.

If "U to O Traffic HO Allowed" is set as "No", and the traffic in



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underlaid subcell will not be considered when MS hand over from underlaid to overlaid.

Note: When "Enhanced IUO allowed" is set as "Yes", it is available.

Traffic Thrsh. of underlay

Range: 0–100

Unit -

Default: 80

Description: If "U to O Traffic HO Allowed" is set as "Yes", and the traffic in underlaid subcell is over "Traffic Thrsh. of underlay", MS will hand over from underlaid to overlaid; otherwise MS will stay in underlaid subcell because the signal quality is good.

If "U to O Traffic HO Allowed" is set as "No", and the traffic in underlaid subcell will not be considered when MS hand over from underlaid to overlaid.

Note: When "U to O Traffic HO Allowed" is set as "Yes", it is available.

Underlay HO Step period

Range: 1–255

Unit Second

Default: 5

Description: If there are some handover requests from underlaid subcell to overlaid at the same time, system will hand over the call with low level. This does not accord with the principle that the best call shall be handed over firstly.

The grade by grade algorithm is used to hand over the MS with high level.

The parameter is the time for that the handover band level decreases "Underlay HO Step level".


Underlay HO Step level

Range: 1–63

Unit None

Default: 5

Description: In the grade by grade handover from underlaid to overlaid, the handover band is extended from 63 to 1. This can hand over the call with high level firstly.

The parameter is the step that handover band decreases.



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Note:

It is used to control the grade by grade handover band from underlaid to overlaid with "Underlay HO Step period".

The "Underlay HO Step period" is the time for that the handover band level decreases "Underlay HO Step level".


Penalty Time of U to O HO (S)

Range: 0 – 255

Unit Second

Default: 10

Description: If "Penalty allowed" is set as "Yes" in [Handover control data table], when a call is handed over from underlaid to overlaid, to prevent ping-pong handover, the call cannot be handed over back underlaid in "Penalty Time of U to O HO (S)".

If "Penalty Time of U to O HO (S)" is "0", the call cannot be handed over back underlaid immediately.


2.5 Power Control

2.5.1 Power Control Selection Table

PC algorithm

Range: HW_1. HW_2

Unit -

Default: HW_2

Description: Power control algorithm to be selected.

Note: 1, BTS3X supports G-II power control shift-to BTS. When HW_2 algorithm is adopted for BTS2X, power control must be implemented at BSC side (wherein, MR Pre-process must be disabled). For BTS2X supporting GPRS (BTS24), power control can be implemented at BTS side (MR Pre-process can be enabled).

UL PC allowed

Range: Yes, No

Unit -

Default: Yes

Description: Whether the MS power adjustment is allowed.



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DL PC allowed

Range: Yes, No

Unit -

Default: Yes

Description: Whether the BTS power adjustment is allowed.

2.5.2 Ordinary Cell PC Table

RX_LEV Thrsh. for UL increase

Range: 0–63. (-110 dBm – -47 dBm)

Unit Grade

Default: 20

Description: Indicates that when the receiving signal level of an uplink is less than the set value of this parameter, the power output of MS should be increased.

RX_LEV Thrsh. for DL increase

Range: 0–63. (-110 dBm – -47 dBm)

Unit Grade

Default: 20

Description: Indicates that when the receiving signal level of a downlink is less than the set value of this parameter, the power output of BTS should be increased.

P1

Range: 1–32

Unit -

Default: 12

Description: Statistics of the receiving signal level of uplink or downlink will be performed during P1 MR period (P1 is the number of MRs), so as to judge whether adjustment of uplink or downlink power is needed.

N1

Range: 1–32

Unit -



2-102

Default: 10

Description: Among P1 MRs, if the receiving level in N1 MRs is lower than “RX_LEV Thrsh. DL/UL increase”, MS or BTS power output will increase.

RX_LEV Thrsh. for UL decrease

Range: 0–63. (-110 dBm–- +47 dBm)

Unit Grade

Default: 40

Description: Indicates that when the receiving uplink signal level is higher than the set value of this parameter, the power output of MS will decrease.

RX_LEV Thrsh. for DL decrease

Range: 0–63. (-110 dBm–- +47 dBm)

Unit Grade

Default: 40

Description: Indicates that when the receiving downlink signal level is higher than the set value of this parameter, the power output of BTS will decrease.

P2

Range: 1–32

Unit -

Default: 20

Description: Statistics of the receiving signal level of uplink or downlink will be performed during P2 MR period (P2 is the number of MRs), so as to judge whether decrement of uplink or downlink power is needed.

N2

Range: 1–32

Unit -

Default: 19

Description: Among P2 MRs, if the receiving level in N2 MRs is lower than the “RX_LEV Thrsh. for DL/UL decrease”, decrement of MS or BTS power output is triggered.

Qual. Thrsh. for UL increase

Range: 0–7



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Unit Grade

Default: 5

Description: Indicates that when the receiving uplink signal quality is worse than the set value of this parameter, the power output of MS will increase.

Qual. Thrsh. for DL increase

Range: 0–7

Unit Grade

Default: 5

Description: Indicates that when the receiving signal quality of a downlink is worse than the set value of this parameter, the power output of BTS should be increased.

P3

Range: 1–32

Unit -

Default: 7

Description: Statistics of the receiving signal quality of uplink or downlink will be performed during P3 MR period (P3 is the number of MRs), so as to judge whether increment on uplink or downlink power is needed.

N3

Range: 1–32

Unit -

Default: 5

Description: Among P3 MRs, if the receiving level in N3 MRs is worse than the “Qual. Thrsh. for DL/UL increase”, increment of MS or BTS power output is triggered.

Qual. Thrsh. for UL decrease

Range: 0–7

Unit Grade

Default: 1

Description: Indicates that when the receiving signal quality of an uplink is better than the set value of this parameter, the power output of MS should be decreased.

Qual. Thrsh. for DL decrease



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Range: 0–7

Unit Grade

Default: 1

Description: Indicates that when the receiving signal quality of a downlink is better than the set value of this parameter, the power output of BTS should be decrease.

P4

Range: 1–32

Unit -

Default: 18

Description: Statistics of the receiving signal quality of uplink or downlink will be performed during P4 MR period (P4 is the number of MRs), so as to judge whether decrement of uplink or downlink power is needed.

N4

Range: 1–32

Unit -

Default: 15

Description: Among P4 MRs, if the receiving quality in N4 MRs is worse than the “Qual. Thrsh. for DL/UL decrease”, decrement of MS or BTS power output is triggered.

Power Control Adjust Period

Range: 1–10

Unit:

Default: 10

Description Normal cell power control adjustment period.

2.5.3 BTS Power Control Data Table

Note: it is the HW I power control algorithm

BTS PC Period

Range: 1–10


Default: 4



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Description The minimum time between two continuous power control commands.

DL RX_LEV Expected

Range: 0–63(-110 dBm– -47 dBm)

Unit Grade

Default: 35

Description:

It defines the signal strength value expected to obtain at MS in a stable state. Expected stable downlink signal strength>downlink edge handover threshold (handover parameter). Otherwise, it will bring Ping-Pong handover due to power control.

Filter Length for DL RX_LEV

Range: 1–31

Unit -

Default: 5

Description:

Indicate the number of MRs in which the average of signal strength of downlink is taken in a stable state before BTS power adjustment. The purpose of setting this parameter is to remove influences of mutation factors so that analysis of whether to make power adjustment is not too partial. When the filtering window is too long, the influence due to mutation will be weakened, and the BTS power adjustment is not timely. If the window is too short, BTS power adjustment will not be accurate enough.

DL RX_LEV Compensation

Range: 0–100

Unit %

Default: 80

Description:

The power adjustment will change as according to the difference between the actual receiving level and the expected receiving level. The downlink compensation factor acts as the weight co-efficient of such adjustment. When the difference is fixed, the greater the compensation factor, the greater the BTS power adjustment.

Note: The sum of downlink path loss compensation factor and downlink quality compensation factor must be 100.

DL Qual. Expected

Range: 0–7

Unit Grade



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Default: 1

Description: The expected signal quality received at MS in a stable state, showing the power adjustment direction.

Filter Length for DL Qual.

Range: 1–31

Unit -

Default: 5

Description:

Indicating the number of MRs in which the average signal strength of downlink is taken in a stable state before BTS power adjustment. The purpose of setting this parameter is to decrease influence of mutation factors. When the filtering window is too long, the influence due to mutation will be weakened, thus the BTS power adjustment is not timely; if the window is too short, BTS power adjustment will not be accurate enough.

DL Qual. Compensation

Range: 0–100

Unit %

Default: 20

Description:

The power adjustment will change as according to the difference between the actual downlink quality and the expected downlink quality. The downlink compensation factor acts as the weight co-efficient of such adjustment. When the difference is fixed, the greater the compensation factor, the greater the BTS power adjustment.


BTS Min Tx Power

Range: 0–36

Unit dBm

Default: 4

Description:

Indicating the minimum transmitting power allowed by the base station. No matter what the original base station power is, how many levels it can be down-tuned, the transmitting power of the base station cannot be lower than this value.

MAX PC Step

Range: 1–16



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Unit grade, 2 dB at each level

Default: 8

Description: Defining the maximum range of BTS power adjustment each time.

PC Adj. Range

Range: 1–16. Corresponding to 0 dB–30 dB

Unit grade, every level corresponding to 2 dB

Default: 16

Description: Indicating the maximum level the base station dynamic power can be adjusted

2.5.4 MS Power Control Data Table

Note: It is a HW I power control algorithm

PC Interval

Range: 1–16


Default: 4

Description: The minimum time between 2 continuous power control commands.

Initial RX_LEV Expected

Range: 0–63, (-110 dBm – -47 dBm)

Unit Grade

Default: 30

Description: Expectant signal strength which BTS receives at PC initial stage. Normally, its value should be greater than “Stable RX_LEV Expected”.

Filter Length for Initial RX_LEV

Range: 1–31

Unit -

Default: 2

Description: Indicates the number of MRs to be used for uplink power control judgment of the uplink signal strength to avoid the impact of sudden change at PC initial stage. If the filtering window is too long, the impact



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of sudden change will be weakened but the BTS power adjustment is not timely. If the window is too short, BTS power adjustment will be inaccurate. At the initial stage, the power adjustment of MS depends only on the receiving signal level but receiving signal quality. To decrease MS transmitting power as soon as possible, normally the value should be less than the value of “Filter length for stable RX_LEV”

Stable RX_LEV Expected

Range: 0–63, (-110 dBm–- +47 dBm)

Unit Grade

Default: 30

Description: The signal strength expected to be received by MS in stable state. DL RX_LEV expected > Edge HO UL RX_LEV Thrsh. Otherwise, it will cause Ping-Pong handover due to power control.

Filter Length for Stable RX_LEV

Range: 1–31

Unit -

Default: 5

Description: Indicates the number of MRs to be used for uplink power control judgment of the uplink signal strength to avoid the impact of sudden change in stable stage. If the filtering window is too long, the impact of sudden change will be weakened but the MS power adjustment is not timely. If the window is too short, MS power adjustment will be inaccurate. At the stable stage, the MS power control depends on the receiving signal level and quality. Power control in the stable state is started once “Filter length for initial RX_LEV” is expired, no matter whether power control at initial stage is performed.

UL RX_LEV Compensation

Range: 1–100

Unit %

Default: 80, Indicates when the difference between the current level and the ideal level is 5 dB , power is adjusted by 4 dB, i.e., 5*80/100)

Description: The power adjustment range will change along with the difference between the actual receiving level and the expected level. The “DL RX_LEV compensation” acts as the weighting coefficient of such difference. When the difference is fixed, the greater the compensating factor, the greater the MS power adjustment.




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UL Qual. Expected

Range: 0–7

Unit grade

Default: 1

Description: The signal quality expected to be received by BTS in stable state.

Filter Length for Qual.

Range: 1–31

Unit -

Default: 6

Description: Indicates the number of MRs to be used for uplink power control judgment of the uplink signal quality to avoid the impact of sudden change in stable stage. If the filtering window is too long, the impact of sudden change will be weakened but the MS power adjustment is not timely. If the window is too short, MS power adjustment will be inaccurate.

UL Qual. Compensation

Range: 0–100

Unit %

Default: 20 ( when the difference between the receiving quality and the expected quality is 1 class, power is adjusted by 2 dB. i.e., 1*20%*10)

Description: The power adjustment range will change along with the difference between the actual receiving quality and the expected quality. The “UL Qual. compensation” acts as the weighting coefficient of such difference. When the difference is fixed, the greater the compensating factor, the greater the MS power adjustment.


Power Increment after HO Fail.

Range: 0–4

Unit 2 dB

Default: 2

Description: Indicates the power level to be raised to avoid call-drop when returning to the original channel after handover failure.

MAX PC Step

Range: 1–15



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Unit 2 dB

Default: 8

Description: Indicates the maximum step that dynamical power control of MS can be performed.

Note 1) In HW_1 PC algorithm, the transmitting power to be adjusted = (UL/DL stable RX_LEV expected – actual UL/DL receiving signal strength) * UL/DL RX_LEV compensation + (actual UL/DL receiving quality – UL/DL Qual. expected *10* UL Qual. compensation. The final adjustment power level should not exceed BTS/MS “MAX PC step”.

2) Before determine a power level to be adjusted, the error tolerance table should be first searched according the currently transmitting power level. The power level to be adjusted should not exceed the error tolerance shown in the following table.

1800M:

Level 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Error tolerance 2 2 2 2 2 2 2 2 2 3 3 3 3 3 4 4 4 2 2 2

900M:

Level 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Error tolerance 2 2 2 4 4 4 4 4 4 4 4 4 4 4 4 4 6 6 6 6

2.5.5 HW II Power Control Data Table

PC Interval

Range: 1–15


Default: 4

Description: The minimum interval between 2 continuous power control commands.

Filter Length for UL RX_LEV

Range: 1–20

Unit -

Default: 6

Description: Indicates the number of MRs to be used for uplink power control judgment of the uplink signal strength.



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Note: For versions before G3BTS24.20000.06.111/G3BTS32.30000.04.1130 /G3BTS34.30000.07.0301/G3BTS36.30000.02.0820, this parameter must be set as 5–20 when BTS is configured with MR pre-processing and G-II power control. Otherwise, error will occur in TRX configuration flow. For versions mentioned above and the subsequent versions, this parameter can be set as 1–20.

Filter Length for DL RX_LEV

Range: 1–20

Unit

Default: 6

Description: Indicates the number of MRs to be used for downlink power control judgment of the downlink signal strength.

Filter Length for UL Qual.

Range: 1–20

Unit -

Default: 6

Description: Indicates the number of MRs to be used for downlink power control judgment of the uplink signal quality.


Filter Length for DL Qual.

Range: 1–20

Unit -

Default: 6

Description: Indicates the number of MRs to be used for downlink power control judgment of the downlink signal quality.


MR. Compensation Allowed

Range: Yes, No



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Unit -

Default: Yes

Description: During the power control judgment, consideration should be given to the impact of different transmitting power levels on the receiving signal strength. When the value of this parameter is “Yes”, the currently received MR will be placed into the MR compensation queue. Then, according to the recorded information about MS and BTS power changes, the receiving signal strength of the MR is compensated.

UL MR. Number Predicted

Range: 0–3

Unit number of MRs

Default: 2

Description: The number of uplink MRs to be predicted. In HW_II PC algorithm, the future receiving signal strength will be predicted so as to counteract the impact of the power control hysteresis.

DL MR. Number Predicted

Range: 0–3

Unit number of MRs

Default: 2

Description: The number of downlink MRs to be predicted. In HW_II PC algorithm, the future receiving signal strength will be predicted so as to counteract the impact of the power control hysteresis.

UL RX_LEV Upper Thrsh.

Range: 0–63 (-110 dBm – -47 dBm)

Unit Grade

Default: 35

Description: The upper threshold of uplink receiving signal strength. In HW_II PC algorithm, the power control threshold includes upper threshold and lower threshold. Only when the receiving signal strength exceeds the range between the upper threshold and lower threshold, will the power control be performed. When the receiving signal strength exceeds the range between upper threshold and lower threshold, the power adjustment value = (UL RX_LEV upper Thrsh. + UL RX_LEV lower Thrsh.)/2- the receiving level. This adjustment value works together with the MAX Adj. value for Qual. zone 0/1/2 to determine the actual power adjustment step.



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UL RX_LEV Lower Thrsh.

Range: 0–63, (-110dBm – -47dBm)

Unit Grade

Default: 25

Description: The lower threshold of uplink receiving signal strength. See the description of “UL RX_LEV upper Thrsh.”.

UL Qual. Upper Thrsh.

Range: 0–7

Unit Grade

Default: 0

Description: The upper threshold of uplink receiving signal quality. In HW_II PC algorithm, the power control threshold includes upper threshold and lower threshold. Only when the receiving signal quality exceeds the range between the upper threshold and lower threshold, will the power control be performed.

UL Qual. Lower Thrsh.

Range: 0–7

Unit grade

Default: 2

Description: The lower threshold of uplink receiving signal quality. In HW_II PC algorithm, the power control threshold includes upper threshold and lower threshold. Only when the receiving signal quality exceeds the range between the upper threshold and lower threshold, will the power control be performed.

DL RX_LEV Upper Thrsh.

Range: 0–63, (-110 dBm– -47 dBm)

Unit Grade

Default: 40

Description: The upper threshold of downlink receiving signal strength. In HW_II PC algorithm, the power control threshold includes upper threshold and lower threshold. Only when the receiving signal strength exceeds the range between the upper threshold and lower threshold, will the power control be performed. When the receiving signal strength exceeds the range between upper threshold and lower threshold, the power adjustment value = (DL RX_LEV upper Thrsh. + DL RX_LEV lower Thrsh.)/2- the receiving level. This adjustment value works together with the MAX Adj. value for Qual. zone 0/1/2 to determine the actual power adjustment step.



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DL RX_LEV Lower Thrsh.

Range: 0–63, (-110 dBm– -47 dBm)

Unit Grade

Default: 30

Description: The lower threshold of downlink receiving signal strength. See the description of “DL RX_LEV upper Thrsh.”.

DL Qual. Upper Thrsh.

Range: 0–7

Unit Grade

Default: 0

Description: The upper threshold of downlink receiving signal quality. In HW_II PC algorithm, the power control threshold includes upper threshold and lower threshold. Only when the receiving signal quality exceeds the range between the upper threshold and lower threshold, will the power control be performed.

DL Qual. Lower Thrsh.

Range: 0–7

Unit Grade

Default: 2

Description: The lower threshold of downlink receiving signal quality. See the description of “DL Qual. upper Thrsh.”.

MAX Down Adj. value Qual. zone 0

Range: 0–30

Unit dB

Default: 4

Description: The maximum downward power adjustment value for quality zone 0. In HW_II PC algorithm, the receiving signal quality is divided into three quality zones (0, 1–2, ƒ3), and different maximum downward power adjustment steps are set for each zone. In the power adjustment according to the receiving signal strength, consideration should be given to the maximum step adjustment for each zone.


Range: 0–30

Unit dB



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Default: 4

Description: The maximum downward power adjustment value when RQ value is 1 or 2.


Range: 0–30

Unit dB

Default: 4

Description: The maximum downward power adjustment value when RQ ≥3.

MAX Down Adj. PC Value by Qual.

Range: 0–4

Unit dB

Default: 4

Description: The adjustment step allowed for the downward power control due to receiving signal quality.

Note In HW_II PC algorithm, the power adjustment request bases on the receiving signal strength and the receiving signal quality. Then the power control adjustment direction and step are obtained by combining the two, as shown as follow table.

MAX Up Adj. PC Value by RX_LEV

Range: 0–32

Unit dB

Default: 16

Description: It is used to set the maximum adjustment step for upward power control by receive level.

Note:

1) BTS3X macro cellular: G3BTS32.30000.04.1130 and later version support the function that the upward adjustment step and the upward adjustment step is processed respectively; support bad receive quality power control. Other versions do not support bad receive quality power control and the upward adjustment step and the downward adjustment step is processed as the downward adjustment step.

2) BTS3002C: G3BTS36.30000.03.0820and later version support the function that the upward adjustment step and the upward adjustment step is processed respectively; support bad receive quality power control. Other versions do not support bad receive quality power control and the upward adjustment step and the downward adjustment step is processed as the downward adjustment step.



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3) Other type sites: all versions do not support the function that the upward adjustment steps and the upward adjustment step are processed respectively; do not support bad receive quality power control.

MAX Up Adj. PC Value by Qual.

Range: 0–32

Unit dB

Default: 8

Description: It is used to set the maximum adjustment step for upward power control by receive quality.

Note:

1) BTS3X macro cellular: G3BTS32.30000.04.1130 and later version support the function that the upward adjustment step and the upward adjustment step is processed respectively; support bad receive quality power control. Other versions do not support bad receive quality power control and the upward adjustment step and the downward adjustment step is processed as the downward adjustment step.

2) BTS3002C: G3BTS36.30000.03.0820and later versionsupport the function that the upward adjustment step and the upward adjustment step is processed respectively; support bad receive quality power control. Other versions do not support bad receive quality power control and the upward adjustment step and the downward adjustment step is processed as the downward adjustment step.

3) Other type sites: all versions do not support the function that the upward adjustment step and the upward adjustment step is processed respectively; do not support bad receive quality power control.

PC adjustment of receiving signal

strength

PC adjustment of receiving signal

quality

Power control adjustment combining the receiving signal

strength and quality

↓ AdjStep_Lev ↓ AdjStep_Qul ↓ maxAdjStep_Lev,AdjStep_Qul)

↓ AdjStep_Lev ↑ AdjStep_Qul No action

↓ AdjStep_Lev No action ↓ AdjStep_Lev

↑AdjStep_Lev ↓ AdjStep_Qul ↑AdjStep_Lev

↑AdjStep_Lev ↑ AdjStep_Qul ↑ max(AdjStep_Lev,AdjStep_Qul)

↑AdjStep_Lev No action ↑AdjStep_Lev

No action ↓ AdjStep_Qul ↓ AdjStep_Qul

No action ↑ AdjStep_Qul ↑ AdjStep_Qul

No action No action No action

BTS PC class



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Range: 1–16; corresponding to 0 dB – 30 dB

Unit Grade

Default: 16

Description: The maximum range of BTS dynamic power control adjustment.

Note: For versions before BTS24 06.1111/ BTS3X 03.1130/ BTS3001C 07.0301/ BTS3002C 02.0820, this parameter must be set as 2–16 when BTS is configured with MR pre-processing and G-II power control. Otherwise, error will occur in TRX configuration flow. For versions mentioned above and the subsequent versions, this parameter can be set as 1–16.

UL Qual. Bad TrigThrsh

Range: 0–7

Unit None

Default: 5

Description: In uplink power control, when the receiving quality of uplink is not less than this start threshold, the actual "upper threshold of signal strength of uplink" will be added with "upper threshold offset of level when the receiving quality of uplink is poor" in the data configuration. Thus, the expected level in uplink power control can be increased furthermore.

UL Qual. Bad UpLEVDiff

Range 0–63

Unit dB

Default 0

Description In uplink power control, when the receiving quality is not less than "start threshold when the receiving quality of uplink is poor", the actual "upper threshold of signal strength of uplink" will be added with this offset value.

DL Qual. Bad TrigThrsh

Range 0–7

Unit None

Default 5

Description In downlink power control, when the receiving quality of downlink is not less than this start threshold, the actual "upper threshold of signal strength of downlink" will be added with "upper threshold offset of level when the receiving quality of downlink is poor" in the data configuration. Thus, the expected level in downlink power control can be increased furthermore.



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DL Qual. Bad UpLEVDiff

Range 0–63

Unit dB

Default 0

Description In downlink power control, when the receiving quality is not less than "start threshold when the receiving quality of downlink is poor", the actual "upper threshold of signal strength of downlink" will be added with this offset value.

2.5.6 Table of BTS Power Control Data (AMR)

Period for Adjusting Power Control

Range: 1–16


Default: 5

Description: The minimum time interval between two successive power control commands

Expected Stable Downlink signal strength

Range: 1–63

Unit Level grade

Default: 35

Note

Definition of expected signal strength in stable MS. Expected stable downlink signal strength > downlink edge handover threshold (handover parameter), otherwise the power control can cause the problem of ping pang handover.

Downlink Signal Strength Filter Length

Range: 1–31

Unit None

Default: 5

Description: Under stable status, before adjusting the BTS power, the number of measurement report that compute average downlink signal strength. The purpose of this parameter is to eliminate influence from burst factors, so that the decision of whether adjust the power control can be supported. Excessive filter window length can weaken the influence of burst, but may result in delayed BTS power control adjustment; insufficient filter window length is vulnerable to burst



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factors, can not reflect the actual condition, and lead to inaccurate power control adjustment.

Downlink Path Loss Compensation Factors

Range: 0–100

Unit %

Default: 80

Description: The adjustment amplitude varies between different difference between actual level received by MS and expected level. Downlink compensation factor is the weight coefficient of such difference. That means the larger the compensation factor, the larger the power need to be adjusted in BTS.

Note The sum of the two parameters “Downlink Path Loss Compensation Factor” and “Downlink Path Quality Compensation Factor” must be 100.

Expected Downlink Quality

Range: 0–7

Unit Grade

Default: 1

Description: In stable status, expected signal receiving quality of MS indicates the direction of power control adjustment.

Downlink Quality Filter Length

Range: 1–31

Unit None

Default: 5

Description: Under stable status, before adjusting the BTS power, the number of measurement reports that compute average downlink signal quality. The purpose of this parameter is to eliminate influence from burst factors, so that the decision of whether adjust the power control can be supported. Excessive filter window length can weaken the influence of burst, but may result in delayed BTS power control adjustment; insufficient filter window length leads to inaccurate power control adjustment.

Downlink Quality Compensation Factor

Range: 0–100

Unit %



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Default: 20

Description: The adjustment amplitude varies between different difference between actual downlink quality and expected downlink quality. Downlink quality compensation factor is the weight coefficient of such difference. If the difference is consistent, the larger the compensation factor, the larger the power need to be adjusted in BTS.

Note The sum of the two parameters “Downlink Path Loss Compensation Factor” and “Downlink Path Quality Compensation Factor” must be 100.

Minimum Transmit Power of BTS

Range: 0–10

Unit dBm

Default: 4

Description: The acceptable minimum transmit power of BTS. BTS transmit power cannot be less than the value despite of the initial power and allowed decrease grades of BTS.

Maximum Step Length in Adjusting Power Control

Range: 0–15

Unit Grade. 2dB per grade

Default: 8

Description: The maximum step length in adjusting BTS power.

Grades of BTS Power Control

Range: 1–16


Default: 16

Description: Maximum value in adjusting BTS dynamic power.



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2.5.7 Table of MS Power Control Data (AMR)

Registration Period

Range: 1–16


Default: 5

Description: The minimum time interval between two successive power control commands.

Expected Initial Signal Strength

Range: 1–63

Unit Level Grade

Default: 30

Description: Expected signal receiving strength of BTS in the initial stage of power control. Generally we should adopt values that are larger than the expected stable signal strength.

Filter Length in Initial Adjustment Stage

Range: 1–31

Unit None

Default: 2

Description: In the initial stage of power control, before adjusting the MS power, the number of measurement reports that compute average uplink signal strength. The purpose of this parameter is to eliminate influence from burst factors, so that the decision of whether adjust the power control can be supported. Excessive filter window length can weaken the influence of burst, but may result in delayed MS power control adjustment; insufficient filter window length leads to inaccurate power control adjustment. In the initial stage, the adjustment of MS power is merely subject to the level rather than the quality of signal reception. To decrease the MS transmit power as soon as possible, we generally adopts value that is less than the length of filter in stable status.

Expected Signal Strength in Stable Status

Range: 1–63

Unit Level Grade

Default: 30

Description: Expected signal receiving strength in stable BTS. Expected stable signal strength > uplink edge handover threshold (handover



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parameter), otherwise the power control can cause the problem of ping pang handover.

Signal Filter Length in Stable Status

Range: 1–31

Unit None

Default: 5

Description: Under stable stage, before adjusting the MS power, the number of measurement reports that compute average uplink signal strength. The purpose of this parameter is to eliminate influence from burst factors, so that the decision of whether adjust the power control can be supported. Excessive filter window length can weaken the influence of burst, but may result in delayed MS power control adjustment; insufficient filter window length leads to inaccurate power control adjustment. In the stable stage, the adjustment of MS power is subject to both level and quality of signal reception. When expected stable filter window is full, initiate the power adjustment in stable status, no matter whether the initialization adjustment is implemented.

Uplink Path Loss Compensation Factor

Range: 1–100

Unit %

Default: 80 (the difference between current level and idea level is 5dB, adjust the power by 4dB, that is, 5*80/100)

Description: The power adjustment amplitude varies between different difference between actual uplink receiving level and expected uplink receiving level. Uplink compensation factor is the weight coefficient of such difference. If such difference is consistent, the larger the compensation factor, the larger the power need to be adjusted in MS.

Note The sum of the two parameters “Uplink Path Loss Compensation Factor” and “Uplink Path Quality Compensation Factor” must be 100.

Expected Uplink Quality

Range: 0–7

Unit Grade

Default: 1

Description: Expected signal receiving quality of BTS in stable status.

Quality Filter Length in Stable Stage

Range: 1–31



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Unit None

Default: 6

Description: Under stable status, before adjusting the MS power, the number of measurement reports that compute average uplink signal quality. The purpose of this parameter is to eliminate influence from burst factors, so that the decision of whether adjust the power control can be supported. Excessive filter window length can weaken the influence of burst, but may result in delayed MS power control adjustment; insufficient filter window length leads to inaccurate power control adjustment.

Uplink Quality Compensation Factor

Range: 1–100

Unit %

Default: 20 (the current quality is 1 grade lower than idea quality. Adjust the power by 2dB, that is (1*20/100) *10)

Description: The power adjustment amplitude varies between different difference between actual uplink quality and expected uplink quality. Uplink compensation factor is the weight coefficient of such difference. If such difference is consistent, the larger the compensation factor, the larger the power need to be adjusted in MS.

Note The sum of the two parameters “Uplink Path Loss Compensation Factor” and “Uplink Path Quality Compensation Factor” must be 100.

Increase power range after handover fails

Range: 0–10


Default: 2

Description: Enlarged MS power when returning the original channel after handover fails, to avoid call drop.

Maximum Step Length in Power Control

Range: 0–15


Default: 8

Description: The maximum dynamic adjusted step length of MS power.



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2.5.8 Table of Power Control Data for Huawei II (AMR)

Power Control Adjustment Period

Range: 1–15


Default: 5

Description: The minimum time interval between two successive power control commands.

Uplink Level Filter Length

Range: 1–20

Unit None

Default: 6

Description: Before adjusting the MS power, the number of measurement reports that compute average uplink signal strength.

Note

In G3BTS24.20000.06.1111 or earlier version, G3BTS32.30000.04.1130 or earlier version, G3BTS34.30000.07.0301 or earlier version, G3BTS36.30000.02.0820 or earlier version, when pre-processing measurement reports in BTS configuration of Huawei II, the range of parameter is 5–20. Parameter not in this range may cause TRX configuration errors. Above listed BTS versions or higher versions can support the parameter from 1 to 20.

Downlink Level Filter Length

Range: 1–20

Unit None

Default: 6

Description: Before adjusting the BTS power, the number of measurement reports that compute average downlink signal strength.

Note

G3BTS24.20000.06.1111 or earlier version, G3BTS32.30000.04.1130 or earlier version, G3BTS34.30000.07.0301 or earlier version, G3BTS36.30000.02.0820 or earlier version, when pre-processing measurement reports in BTS configuration of Huawei II, the range of parameter is 5–20. Parameter not in this range may cause TRX configuration errors. Above listed BTS versions or higher versions can support the parameter from 1 to 20.

Uplink Quality Filter Length

Range: 1–20

Unit None



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Default: 6

Description: Before adjusting the MS power, the number of measurement reports that compute average uplink signal quality.

Note


Downlink Quality Filter Length

Range: 1–20

Unit None

Default: 6

Description: Before adjusting the MS power, the number of measurement reports that compute average uplink signal quality.

Note


Switch of Measurement Report Compensation

Range: Yes, No

Unit None

Default: Yes

Description: After the switch is on, the received measurement reports are put into the measurement report compensation queue. Then record information about variation of transmit power according to power values of MS and BTS in the reports. After interpolation of measurement reports, compensate the receiving level of history measurement reports according to above recorded information.

Uplink Prediction Measurement Reports

Range: 0–3

Unit The number of measurement reports

Default: 2

Description: In the Huawei II power control algorithm, the decision of power control is not subject to the average filter value in history measurement



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reports. The method is add prediction function in filter to offset the delay of power adjustment. This parameter specifies the number of uplink measurement reports that performs the prediction.

Downlink Prediction Measurement Reports

Range: 0−3

Unit The number of measurement reports

Default: 2

Description: In the Huawei II power control algorithm, the decision of power control is not subject to the average filter value in history measurement reports. The method is add prediction function in filter to offset the delay of power adjustment. This parameter specifies the number of downlink measurement reports that performs the prediction.

Uplink Signal Strength Upper Threshold

Range: 0−63 (mapping -110−-47dBm)

Unit Level Grade

Default: 35

Description: In calculation of power control step, the parameter signal level has its upper threshold and lower threshold. No need to adjust a signal that falls between the upper threshold and lower one. Only perform the power control when a signal is out of this range. This parameter defines the upper threshold of uplink signal in power control. If the signal level exceeds the upper threshold, the power should be

increased by: (= 2ThresholdLowerThresholdUpper +

−Received Level). The actual adjusting step length is decided by both the increment and the maximum adjusting step length allowed in the quality band.

Uplink Signal Strength Lower Threshold


Unit Level Grade

Default: 25

Description: In calculation of power control step, the parameter signal level has its upper threshold and lower threshold. No need to adjust a signal that falls between the upper threshold and lower one. Only perform the power control when a signal is out of this range. This parameter defines the lower threshold of uplink signal in power control. If the signal level is less than the lower threshold, the power should be decreased by: (=Received



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Level− 2ThresholdLowerThresholdUpper +

). The actual adjusting step length is decided by both the decrement and the maximum adjusting step length allowed in the quality band.

Uplink Signal Quality Upper Threshold

Range: 0−7

Unit Grade

Default: 0

Description: In calculation of power control step, the parameter signal quality has its upper threshold and lower threshold. Only perform the power control when the quality of a signal falls out of the range. This parameter defines the quality upper threshold of uplink signal in power control.

Uplink Signal Quality Lower Threshold

Range: 0−7

Unit Grade

Default: 2

Description: In calculation of power control step, the parameter signal quality has its upper threshold and lower threshold. Only perform the power control when the quality of a signal falls out of the range. This parameter defines the quality lower threshold of uplink signal in power control.

Downlink Signal Strength Upper Threshold


Unit Level grade

Default: 40

Description: In calculation of power control step, the parameter signal level has its upper threshold and lower threshold. No need to adjust a signal that falls between the upper threshold and lower one. Only perform the power control when a signal is out of this range. This parameter defines the upper threshold of downlink signal in power control. If the signal level exceeds the upper threshold, the power should be

increased by: (= 2ThresholdLowerThresholdUpper +

−Received Level). The actual adjusting step length is decided by both the increment and the maximum adjusting step length allowed in the quality band.



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Downlink Signal Strength Lower Threshold


Unit Level grade

Default: 30

Description: In calculation of power control step, the parameter signal level has its upper threshold and lower threshold. No need to adjust a signal that falls between the upper threshold and lower one. Only perform the power control when a signal is out of this range. This parameter defines the lower threshold of downlink signal in power control. If the signal level is less than the lower threshold, the power should be decreased by: (=Received

Level− 2ThresholdLowerThresholdUpper +

). The actual adjusting step length is decided by both the decrement and the maximum adjusting step length allowed in the quality band.

Downlink Signal Quality Upper Threshold

Range: 0−7

Unit Grade

Default: 0

Description: In calculation of power control step, the parameter signal quality has its upper threshold and lower threshold. Only perform the power control when the quality of a signal falls out of the range. This parameter defines the quality upper threshold of downlink signal in power control.

Downlink Signal Quality Lower Threshold

Range: 0−7

Unit Grade

Default: 2

Description: In calculation of power control step, the parameter signal quality has its upper threshold and lower threshold. Only perform the power control when the quality of a signal falls out of the range. This parameter defines the quality lower threshold of downlink signal in power control.

Maximum Step Length of Downward Power Control in Quality Band 0 According to Level

Range: 0−30

Unit dB



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Default: 4

Description: In Huawei II power control algorithm, the quality is split into three bands according to the quality of signal receiving (RQ value): 0, 1−2, ƒ3. When adjusting power according to level, the maximum step length of downward power adjustment varies between different quality bands. If the maximum step length allowed in downward adjustment is insufficient, the algorithm cannot achieve quick power control; if such a step length is too long, the validity of power control may be reduced. This parameter defines the maximum step length that can be adjusted in downward power control when RQ value is 0.


Range: 0−30

Unit dB

Default: 4

Description: In the power adjustment according to the level, this parameter defines the maximum step length that can be adjusted in downward power control when RQ value is 1 or 2 (falls into the quality band (0, 1)).


Range: 0−30

Unit dB

Default: 4

Description: In the power adjustment according to the level, this parameter defines the maximum step length that can be adjusted in downward power control when quality RQ valueƒ3.

Maximum Step Length of Downward Power Control According to the Quality

Range: 0−4

Unit dB

Default: 4

Description: Allowed maximum step length that can be adjusted in downward power control according to the quality of receiving signals.

Note

G3BTS24.20000.06.1111 or earlier version, G3BTS32.30000.04.1130 or earlier version, G3BTS34.30000.07.0301 or earlier version, G3BTS36.30000.02.0820 or earlier version, when pre-processing measurement reports in BTS configuration of Huawei II, the range of parameter is 2−4. Parameter not in this range may cause TRX configuration errors. Above listed BTS versions or higher versions can support the parameter from 0 to 4.



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Maximum Step Length of Upward Power Control According to the Level

Range: 0−32

Unit dB

Default: 16

Description: Allowed maximum step length that can be adjusted in upward power control according to the level.

Note

(1) BTS3X macro cell: G3BTS32.30000.04.1130 and higher version allow to separately process upward step length and downward step length and support power control for poor quality; the earlier version does not provide such functions.

(2) BTS3002C: G3BTS36.30000.03.0820 and higher version allow to separately process upward step length and downward step length and support power control for poor quality; the earlier version does not provide such functions.

(3) Other sites: All version neither allows to separately process upward step length and downward step length, nor supports power control for poor quality.

Maximum Step Length of Upward Power Control According to the Quality

Range: 0−32

Unit dB

Default: 8

Description: Allowed maximum step length that can be adjusted in upward power control according to the quality of receiving signals.

Note

(1) BTS3X macro cell: G3BTS32.30000.04.1130 and higher version allow to separately process upward step length and downward step length and support power control for poor quality; the earlier version does not provide such functions.

(2) BTS3002C: G3BTS36.30000.03.0820 and higher version allow to separately process upward step length and downward step length and support power control for poor quality; the earlier version does not provide such functions.

(3) Other sites: All version neither allows to separately process upward step length and downward step length, nor supports power control for poor quality.

In Huawei II power control algorithm, the amplitude of power adjustment can be computed in aspect of both level and quality of receiving signals, then the two results are integrated to bring about the direction and step length of adjusting power control.



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Power control adjustment of

receiving Level

Power control adjustment of

receiving quality Power control adjustment of Integrated level and quality

↓ AdjStep_Lev ↓ AdjStep_Qul ↓ max(AdjStep_Lev,AdjStep_Qul)

↓ AdjStep_Lev ↑ AdjStep_Qul No action

↓ AdjStep_Lev No action ↓ AdjStep_Lev

↑AdjStep_Lev ↓ AdjStep_Qul ↑AdjStep_Lev

↑AdjStep_Lev ↑ AdjStep_Qul ↑ max(AdjStep_Lev,AdjStep_Qul)

↑AdjStep_Lev No action ↑AdjStep_Lev

No action ↓ AdjStep_Qul ↓ AdjStep_Qul

No action ↑ AdjStep_Qul ↑ AdjStep_Qul

No action No action No action

BTS Power Control Grade

Range: 1−16, 0dB−30dB

Unit Grade

Default: 16

Description: Maximum of BTS dynamic power adjustment.

Note

BTS24 06.1111 or earlier version, BTS3X 03.1130 or earlier version, BTS3001C 07.0301 or earlier version, BTS3002C 02.0820 or earlier version, when pre-processing measurement reports in BTS configuration of Huawei II, the range of parameter is 2−16. Parameter not in this range may cause TRX configuration errors. Above listed BTS versions or higher versions can support the parameter from 1 to 16.

Uplink Quality Initiation Lower Threshold

Range: 0−7

Unit Quality Grade

Default: 5

Description: In uplink power control, when the value of uplink receiving quality is larger than the initiation threshold, the actual “Uplink Signal Strength Upper Threshold” will add the ”Uplink Poor Quality Deviation to the Level Upper Threshold”. This action can further increase the expected level value of uplink power control.

Uplink Poor Quality Deviation to the Level Upper Threshold

Range: 0−63



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Unit dB

Default: 0

Description: In uplink power control, when the value of uplink receiving quality is no less than that of the “Uplink Quality Initiation Lower Threshold”, the actual “Uplink Signal Strength Upper Threshold” will add the ”Uplink Poor Quality Deviation to the Level Upper Threshold”.

Downlink Quality Initiation Lower Threshold

Range: 0−7

Unit Quality Grade

Default: 5

Description: In downlink power control, when the value of downlink receiving quality is larger than the initiation threshold, the actual “Downlink Signal Strength Upper Threshold” will add the ”Downlink Poor Quality Deviation to the Level Upper Threshold”. This action can further increase the expected level value of uplink power control.

Uplink Poor Quality Deviation to the Level Upper Threshold

Range: 0−63

Unit dB

Default: 0

Note

In downlink power control, when the value of downlink receiving quality is no less than that of the “Downlink Quality Initiation Lower Threshold”, the actual “Downlink Signal Strength Upper Threshold” will add the ”Downlink Poor Quality Deviation to the Level Upper Threshold”.

2.6 Channels

2.6.1 Radio Channel Management Control Table

CH Allocation Algorithm

Range: Huawei I algorithms and Huawei II algorithms

Unit -

Default: Huawei II algorithms

Description: The channel allocation algorithm to be used.

1) HW_I algorithm uses the sequent selection mode to allocate



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channels.

2) HW_II algorithm allocates channels by optimum.

Note HW_II algorithm is recommended only in version BSC1120 or above.

SD Dynamic Allocation Allowed

Range: Yes, No

Unit -

Default: Yes

Description: Indicates whether SDCCH dynamical allocation is allowed.

Note:

1, BSC06.1120A supports SDCCH enforced recovery. Once SD Dynamic Allocation Allowed is set as “No”, all SDCCHs converted from TCHs recover into TCHs immediately.

2, BSC06.1120A supports single-TRX cell SDCCH dynamic conversion.

Idle SD Thrsh.N1

Range: 0−63

Unit -

Default: 2

Description: When the number of idle SDCCH channels is less than or equal to the “Idle SD Thrsh.”, the system will try to find available TCHs and convert them to SDCCH channels.

Note:

The conditions to Initiate the TCH-to-SDCCH conversion flow:

1) The number of idle SDCCH channels+8 is less than or equal to “Idle SD Thrsh.”.

2) The number of current idle full rate TCH channels is more than 4 or more than the number of TRXs.

3) The number of current SDCCH channels is less than “Cell SD maximum.

Cell SD Maximum

Range: 0–255

Unit -

Default: Configured SDCCHs + 8

Description: The maximum number of SDCCHs in the cell.

Note: 1) The processing flow of recovering SDCCH to TCH is as follows: a timer Count is set for each cell. Every time a TCH is converted into an



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SDCCH, the Count is set to ResTime. Count is adjusted every 3 seconds. If the current idle SDCCH channels > 8 +Idle TCH Thrsh., then: the Count minus 3. If the current idle SDCCH channels < 8 + Idle TCH Thrsh., then plus 12 to Count, but the Count must not exceed ResTime. If the current idle SDCCH channels = 8 + Idle TCH Thrsh., then Count remains unchanged. After the adjustment, if Count ≤ 0, then one TCH channel will be recovered.

2) Due to TRX hardware processing capability restriction, at most 2 time slots can be configured as SDCCH channels for each TRX. To initiate the TCH-to-SDCCH conversion, if the selected TCH is occupied, the connection will be handed over to other idle TCH channel in this cell. During dynamic SDCCH channel allocation, each time only one TCH is converted into SDCCH. So does the SDCCH-to-TCH conversion.

3) During the TCH-to-SDCCH conversion, TCH channels on TRX in where BCCH is located should not be selected.

TCH Minimum Recovery Time(s)

Range: 60–3600

Unit second

Default: 600

Description: The minimum interval for the TCH recovery after TCH-to-SDCCH conversion.

Idle TCH Thrsh. N1

Range: 0–255

Unit -

Default: 0

Description: Only when the number of idle TCH channels is less than or equal to the “Idle TCH Thrsh. N1” and the duration is longer than “Apply_TCH Decision Period T(m)”, can PDCH-to-TCH conversion be performed.

Apply- TCH Decision Period T(m)

Range: 0–65535

Unit minute

Default: 0

Description: The duration to judge whether PDCH to TCH conversion can be performed.

Idle Thrsh. For TCH/F priority

Range: 0–255



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Unit: Channel number

Default: 2

Description:

Parameter is used to judge which type of channel is to be allocated. If channel number of idle full rate TCH is greater than this threshold, then idle full rate TCH is allocated first for the better voice quality. Otherwise, half rate TCH is allocated first.

TCH Rate adjust allowed

Range: Yes, No

Unit:

Default: No.

Description

It is used to decide whether full rate TCH can be converted into half-rate TCH. “Yes” means the conversion is feasible, while “No” means not. For the latter case, the half-rate TCH converted will change back to the full rate TCH.

TCH Rate adjust Traffic Thrsh (%)

Range: 0–100

Unit: %

Default: 80

Description

It is one of the terms for the full rate TCH to convert into the half-rate TCH. Only if the traffic (number of currently occupied channels / number of available channels in a cell) is greater than the threshold, and “TCH Rate Conversion" is set as “Yes", can the full rate TCH convert into the half rate TCH to expand system capacity.

MIN Recovery Time of TCH/H

Range: 0–65535

Unit: second

Default: 600

Description: The minimum interval that half-rate TCH recovers into full rate TCH.

TCH/F Forbid TCH Rate Adjust

Range: 0–255

Unit: None

Default: 1

Description: The value of the parameter is one condition for the adjustment from full rate TCH to half rate TCH. When the number of available half rate



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TCH in the cell is more than the value, system adjust full rate TCH as half rate TCH to enlarge the capacity.

Note:

Dynamic conversion among different type channels: Support dynamic conversion between TCH/F and TCH/H. Channels initially configured as TCH/H can not be converted. Support dynamic conversion between TCH/F and PDCH. Channels initially configured as PDCH can not be converted. Support dynamic conversion between TCH/F and SDCCH. Not support dynamic conversion between TCH/H and SDCCH.

2.6.2 HW II Channel Allocation Table

HW_II channel allocation algorithm is an advanced algorithm, which gives consideration to such factors as TRX priority, history record priority, and channel interference record priority. Thus, the channel allocation performance is improved.

SD allocation priority allowed

Range: Yes, No

Unit -

Default: Yes

Description: If the setting is "No", then the roll selection is adopted for SDCCH allocation. If the setting is "Yes", then the optimum selection is adopted.

iInterf. Priority allowed

Range: Yes, No

Unit -

Default: Yes

Description: Indicates whether the interference record priority is allowed.

Active Ch Inter. Meas. allowed

Range: Yes, No

Unit -



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Default: Yes

Description: Indicates whether the interference of the active channel is measured. If the setting "No", the system does not judge whether the active channel is interfered, or sending interference indication message. Otherwise, judgment will be made.

Allocation TRX priority allowed

Range: Yes, No

Unit -

Default: Yes

Description: Whether the TRX priority is used for allocation.

History records priority allowed

Range: Yes, No

Unit -

Default: Yes

Description: Whether the history record priority is used for allocation.

Balance traffic allowed

Range: Yes, No

Unit _

Default: Yes

Description: If the setting is "No", the channel next to the previously allocated channel will be the starting channel for searching a qualified channel to be allocated.

Interf. of UL Level thrsh.

Range: 0–63, (-110 dBm– -47 dBm)

Unit Grade

Default: 31

Description: Threshold of uplink strength interference. If the uplink strength of a channel is greater than this threshold and the uplink signal quality is worse than or equal to the “Interf. of UL Qual. Thrsh.”, then uplink interference exists.

Interf. of UL qual. Thrsh.

Range: 0–70, (RQ0–RQ7)

Unit quality grade value



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Default: 40

Description: Threshold of uplink quality interference. See the description of “Interf. of UL level Thrsh. “.

Interf. of DL Level Thrsh.

Range: 0–63, (-110 dBm– -47 dBm)

Unit Grade

Default: 31

Description: Threshold of downlink strength interference. If the downlink strength of a channel is greater than this threshold and the down signal quality is worse than or equal to the “Interf. of DL Qual. Thrsh.”, then uplink interference exists.

Interf. of DL Qua. Thrsh.

Range: 0–70, (RQ0–RQ7)

Unit quality grade value

Default: 40

Description: Threshold of downlink quality interference. See the description of “Interf. of DL level Thrsh.”.

Filter length for TCH Level

Range: 1–32

Unit -

Default: 6

Description: Used to filter the receiving signal strength of speech/data channel.

Filter length for TCH Qual.

Range: 1–32

Unit -

Default: 6

Description: Used to filter the receiving signal quality of speech/data channel.

Filter length for SDCCH Level

Range: 1–32

Unit -

Default: 2



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Description: Used to filter the receiving signal strength of SDCCH channel.

Filter length for SDCCH Qual.

Range: 1–32

Unit -

Default: 2

Description: Used to filter the receiving signal quality of SDCCH channel.

Update Period of CH Record

Range: 1–1,440

Unit Minute

Default: 30

Description: In HW_II channel management algorithm, every time the duration (set by this parameter) expires, the history record of every channel will be refreshed through subtracting the value of “Update Freq. of CH record ". Thus the channel priority is raised. This parameter together with the "Update Freq. of CH record " works to prevent a channel from being allocated again, which has been deteriorated for a period of time.

Update Freq. Of CH record

Range: 0–63

Unit -

Default: 2

Description: The history record priority higher than the value of this parameter will be refreshed through subtracting the value of this parameter. See the description of “Update Period of CH record”

Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller

Chapter 3 BCCH participate in FH Data Configuration.


3-1

Chapter 3 BCCH participate in FH Data

Configuration.

3.1 Overview

BCCH carrier participating in FH indicates that all timeslots except timeslot 0 of BCCH carrier participate in FH. It must be based on Timeslot FH. Two MAs should be employed for BCCH participating in FH. One is used for all timeslots except the timeslot 0 of all carriers, it contains all frequencies including BCCH frequency. The other is used for the timeslot 0 of all carriers except BCCH carrier; correspondingly it contains all frequencies except BCCH frequency.

3.2 Data Configuration

Assumption: one cell has three carriers (TRX0, TRX1, and TRX2) with three frequencies (F1, F2, and F3), BCCH frequency participating in FH is required.

The data configuration is shown as follows:

1) There are two MAs, one is MA0 (F1, F2, F3) for all timeslots except the timeslot 0 of all carriers; The other is MA1 (F2, F3) for the timeslot 0 of all carriers except BCCH carrier.

2) Baseband FH mode should be selected for this cell. 3) The timeslot 0 of BCCH carrier does not participate in FH (The HSN index No. is

0), the rest timeslots participate in FH (The HSN index No. is non-0) 4) The same HSN must be shared for timeslot 0 and the other timeslots

participating in FH. Here assumes the HSN is 10.

The data configuration is shown as follows:

TRX0 channel configuration



TS0 F1 F2, F3 HSN=10 MAIO=0

F2, F3 HSN=10 MAIO=1

TS1 F1, F2, F3 HSN=10 MAIO=0

F1, F2, F3 HSN=10 MAIO=1




F1,F2, F3 HSN=10 MAIO=2



F1, F2,F3 HSN=10 MAIO=2

Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller

Chapter 3 BCCH participate in FH Data Configuration.


3-2
















Technology

Network parameter-huawei[1]