BSS Local Switching(GBSS14.0_01)

BSS Local Switching GBSS14.0

Feature Parameter Description

Issue 01

Date 2012-04-28

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.

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GSM BSS

BSS Local Switching Contents

Issue 01 (2012-04-28) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

i

Contents

1 Introduction to This Document ............................................................................................. 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience......................................................................................................................... 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview...................................................................................................................................... 2-1

3 Technical Description .............................................................................................................. 3-1

3.1 Principles of BSC Local Switching ................................................................................................ 3-1

3.2 Principles of BTS Local Switching................................................................................................. 3-2

4 Procedures Related to BSS Local Switching .................................................................... 4-1

4.1 Triggering of the BSS Local Switching Call ................................................................................... 4-1

4.2 Restoration of the BSS Local Switching Call ................................................................................ 4-4

4.3 Handover of the BSS Local Switching Call ................................................................................... 4-5

5 Impact on CN Services ............................................................................................................ 5-1

6 Engineering Guidelines ........................................................................................................... 6-1

7 Parameters.................................................................................................................................. 7-1

8 Counters ...................................................................................................................................... 8-1

9 Glossary ...................................................................................................................................... 9-1

10 Reference Documents ......................................................................................................... 10-1

GSM BSS

BSS Local Switching 1 Introduction to This Document



1-1

1 Introduction to This Document

1.1 Scope

This document describes the Huawei GSM base station subsystem (GBSS) local switching feature. It covers the function of and mechanism regarding BSS local switching, including the principles and procedures for implementing the feature.

1.2 Intended Audience

It is assumed that users of this document are familiar with GSM basics and have a working knowledge of GSM telecommunication.

This document is intended for:

Personnel working on Huawei GSM products or systems

System operators who need a general understanding of this feature

1.3 Change History

The change history provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to a change in the BSS local switching feature of a specific product version.

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issues

The document issue is as follows:

01 (2012-04-28)

Draft A (2012-02-15)

01 (2012-04-28)

This is the first release of GBSS14.0.

Compared with issue draft A (2012-02-15) of GBSS14.0, issue 01 (2012-04-28) of GBSS14.0 has no change.

Draft A (2012-02-15)

This is the draft release of GBSS14.0.

Compared with issue 02 (2011-07-15) of GBSS13.0, draft A (2012-02-15) of GBSS14.0 i has no change.

GSM BSS

BSS Local Switching 2 Overview



2-1

2 Overview

BSS local switching is classified into BSC local switching and BTS local switching.

BSC local switching is triggered when the BSC detects that the calling MS and the called MS of a call are under the same BSC. When BSC local switching is triggered, the speech signals are looped back on the BSC side. In addition, the signaling link on the MSC side is reserved, and the transmission resources on the Ater interface and the TC resources are released.

BTS local switching is triggered when the BTS detects that the calling MS and the called MS of a call are under the same BTS, in the same BTS group, or in the same local switching area. When BTS local switching is triggered, the speech signals are looped back on the BTS side, in the BTS group, or in the local switching area. In addition, the signaling link on the MSC side is reserved, and the transmission resources on the Ater interface, the transmission resources on the Abis interface, and the TC resources are released.

NOTE

A BTS group consists of one or more BTSs that share the same link and are controlled by the same BSC. Within a BTS group, the BTSs can be connected in a chain, star, or tree topology. A BTS can be considered as a group.

As shown in Figure 2-1 MS 1 (calling MS) and MS 2 (called MS) are under the same BSC; MS 3 (calling MS) and MS 4 (called MS) are under the same BSC. The speech signals are looped back to the MS on the BSC side. As a result, the BSC local switching is triggered, and the transmission resources on the Ater interface are released.

Figure 2-1 Loopback of speech signals in BSC local switching

Ater

Abis

BTS3

BTS4

BTS5BTS2

BTS1

BSC TC

MS1

MS2

MS3

MS4

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2-2

As shown in Figure 2-2 MS 1 (calling MS) and MS 2 (called MS) are in the same BTS group; MS 3 (calling MS) and MS 4 (called MS) are under the same BTS. The speech signals are looped back to the MS in the BTS group or on the BTS side. As a result, BTS local switching is triggered in time division multiplexing (TDM) transmission mode, and the transmission resources on the Ater interface and a certain number of transmission resources on the Abis interface are released.

Figure 2-2 Loopback of speech signals in BTS group in BTS local switching

Ater

Abis

BTS3

BTS4

BTS2

BTS1

BSC TC

MS1

MS2

MS3

MS4

As shown in Figure 2-3 the BTSs are in IP transmission mode. MS 1 (calling MS) and MS 2 (called MS) are in the same local switching area, and MS 3 (calling MS) and MS 4 (called MS) are in the same local switching area. The speech signals are looped back to the MS on the IP BTS in the local switching area. As a result, BTS local switching is triggered and in IP transmission mode, and the transmission resources on the Ater interface and a certain number of transmission resources on the Abis interface are released.

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2-3

Figure 2-3 Loopback of speech signals in local switching area in BTS local switching

AterAbis

BSC

MS2

MS4

MS3

MS1

TC

BTS1

IP Network

One local switching

area

BTS2

BTS4BTS3

One local

switching area

BSS local switching reduces the number of transmission resources required by a local call. Therefore, when BSS local switching is enabled, the number of transmission resources configured can be reduced, and the cost can also be reduced. In addition, BSS local switching avoids transcoding on the CN side. In this way, it reduces, especially in satellite transmission mode, the transmission delay of speech signals and improves the speech quality.

BTS local switching and BSC local switching can be enabled independently or simultaneously. BSS local switching can be enabled only when the speech coding rate of the calling MS is the same as the speech coding rate of the called MS.

BSS local switching applies to the following scenarios:

Where the calling MS and the called MS of a large number of calls are under the same BSC or BTS

BSS local switching applies to the scenario where the calling MS and the called MS of a large number of calls are under the same BSC or BTS. In this way, a large number of transmission resources are saved.

Network in remote areas

BSS local switching applies to the remote areas where transmission resources are insufficient to save the transmission resources.

Temporary coverage or emergent communication requirements

BSS local switching applies to the scenario of a large gathering or capacity expansion to meet the call requirements.

GSM BSS

BSS Local Switching 3 Technical Description



3-1

3 Technical Description

3.1 Principles of BSC Local Switching

Figure 3-1 shows BSC local switching. (GBFD-117701 BSC Local Switch)

Figure 3-1 BSC local switching

A B C D E

F

BTS

BTS

BTS

BSC

MGW

MGW

MSC

Speech signals of the BSC local switching

between BTSs controlled by a BSC

Traffic link

Signaling link

F

TC

BSC local switching is performed on the BSS side without involving NEs on the NSS side. In other words, the speech signals are not sent to the MSC. The transmission resources of sections D and E on the MSC side, however, are not released.

After BSC local switching is enabled, the speech signals are looped back to the BTS on the BSC side. In addition, idle frames are sent to the CN through the A interface board. In this way, the transmission resources of section C between the BSC and the TC are released, whereas the circuits occupied on the CN side are not released. As the number of transmission resources required by a call is reduced, the number of transmission resources configured is also reduced. In this way, the cost of network deployment is reduced.

In virtual loopback, the BSC does not process the signals received from the CN and sends idle frames to the CN to ensure that the circuits occupied on the CN side are not released. Hence, the purpose of virtual loopback is to ensure that the circuits on the CN side are occupied.

If BSC local switching is only used to save the transmission resources on the Ater interface, BssLsGenMode should be set to BSCONLY(BSC Only). If BSC local switching is preferentially used to save the transmission resources on the Abis and Ater interfaces, BssLsGenMode should be set to

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3-2

BSCPRIORITY(BSC Priority).If BSSLSGENMODE is set to BSCPRIORITY(BSC Priority), you must set ISSUPPORTBTSLSWITCH to ON and set BSCLSSTARTMODE accordingly.

3.2 Principles of BTS Local Switching

When SERVICEMODE of the Abis interface is set to TDM, BTS local switching is classified into the local switching under a BTS and the local switching in a BTS group. The local switching under a BTS is considered as the local switching in a BTS group that is comprised of one BTS. In the case of the local switching in a BTS group, the BSC automatically locates the BTS that is the nearest to the calling MS and the called MS and performs loopback on the BTS to save the transmission resources.

When SERVICEMODE of the Abis interface is set to IP, BTS local switching is classified into the local switching under a BTS and the local switching between IP BTSs in a local switching area. The local switching under a BTS is considered as a special case of the local switching between IP BTSs in a local switching area. Local switching area refers to the area where the BTSs are in IP transmission mode and are connected to the same BSC. In addition, the BTSs in the local switching area can communicate with each other through IP transmission. BTS local switching can be triggered only when the calling and called MSs of a call are served by the BTS/BTSs in the same local switching area. The local switching area where an IP BTS enabled with the local switching function is located can be configured by using the REGION parameter. In a local switching area, the BSC sends the local switching message to the IP BTS. Based on the local switching message received, the IP BTS then changes the destination IP address to the IP address of the destination IP BTS to complete the loopback of the speech signals.

Figure 3-2 shows BTS local switching. (GBFD-117702 BTS Local Switch)

Figure 3-2 BTS local switching

(2)

A B C D E

F

BTS

BTS

BTS

BSC

MGW

MGW

MSC

Speech signals of the BTS local switching under

the same BTS or same BTS group

Traffic link

Signaling link

(1)

F

TC

BTS local switching is performed on the BSS side without involving NEs on the NSS side. In other words, the speech signals are not sent to the MSC. The transmission resources of sections D and E on the MSC side, however, are not released.


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3-3

After BTS local switching is enabled, the speech signals are looped back on the BTS to the MS, and idle frames are sent to the MSC on the A interface. In this case, the transmission resources of section B between the BTS and the BSC and the transmission resources of section C between the BSC and the TC are released, whereas the circuits occupied on the CN side are not released.

To enable the BTS local switching function, set ISSUPPORTBTSLSWITCH to ON.

If BTS local switching is only used to save the transmission resources on the Abis and Ater interfaces, BssLsGenMode should be set to BTSONLY(BTS Only). If BTS local switching is preferentially used to save the transmission resources on the Abis and Ater interfaces, BssLsGenMode should be set to BTSPRIORITY(BTS Priority). If BssLsGenMode is set to BTSPRIORITY(BTS Priority), you should also configure BtsLsStartMode.





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GSM BSS

BSS Local Switching 4 Procedures Related to BSS Local Switching



4-1

4 Procedures Related to BSS Local Switching

4.1 Triggering of the BSS Local Switching Call

The triggering of the BSS local switching call involves the following procedures: checking of BSS local switching general strategy, detection of the BSS local switching call, checking of BSC/BTS local switching strategy, and speech version selection for the BSS local switching call.

Checking of BSS Local Switching General Strategy

After the called party answers the phone or the incoming BSC handover is complete, the BSC determines whether to enable BSC local switching or BTS local switching based on the setting of BssLsGenMode. In the following cases, however, BSC local switching or BTS local switching cannot be triggered.

BSSLSGENMODE is set to support BSC local switching.

BSC local switching can be triggered only when both the calling and called MSs meet the conditions specified by the parameters listed from MsisdnSegList2AvoidBscLs1 to MsisdnSegList2AvoidBscLs10.

BSSLSGENMODE is set to support BTS local switching.

BTS local switching can be triggered only when the calling and called MSs meet the conditions specified by the parameters listed from MsisdnSegList2AvoidBtsLs1 to MsisdnSegList2AvoidBtsLs10.

The parameters listed from MsisdnSegList2AvoidBscLs1 to MsisdnSegList2AvoidBscLs10 and

MsisdnSegList2AvoidBtsLs1 to MsisdnSegList2AvoidBtsLs10 are optional parameters.

BTS local switching can be triggered only when the ISSUPPORTBTSLSWITCH parameter of the BTS or of the BTSs in the BTS group is set to YES(Yes).

Detection of the BSS Local Switching Call

If BSS local switching can be triggered, the BSC starts the BSS local switching call detection to detect whether the calling MS and the called MS are under the same BSC.

Checking of BSC/BTS Local Switching Strategy

If the calling MS and the called MS are under the same BSC, the BSC checks the settings of BscLsStartMode or BtsLsStartMode to determine whether to trigger local switching.

BSC local switching

− If BscLsStartMode is set to UNCONDITIONALSTART(Unconditional Start), BSC local switching is always triggered.

− If BscLsStartMode is set to ATERCONGESTS(Start When Ater Congests), BSC local switching is triggered only when the congestion rate on the Ater interface exceeds AterJamThreshold2StartLs.

− If BscLsStartMode is set to PREFIXNUMBER(Start by Prefix Number), BSC local switching is triggered when either the calling MS or the called MS meets the conditions specified by Prefix Number for BSC n, which here n indicates the range from 1 to 10.

BTS local switching

− If BtsLsStartMode is set to UNCONDITIONALSTART(Unconditional Start), BTS local switching is always triggered.

− If BtsLsStartMode is set to ABISCONGESTS(Start When Abis Congests), BTS local switching is triggered only when the congestion rate on the Abis interface exceeds AbisJamThreshold2StartLs.



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4-2

− If BtsLsStartMode is set to PREFIXNUMBER(Start by Prefix Number), BTS local switching is triggered when either the calling MS or the called MS meets the conditions specified by Prefix Number for BTS n, which here n indicates the range from 1 to 10.

− In IP transmission mode, BTS local switching can be triggered only when the BTS serving the calling MS and the BTS serving the called MS are in the same local switching area.

− After an intra-BSC handover is complete, local switching is triggered only when BSSLSGENMODE is set

to BTSONLY(BTS Only) if the source cell and the target cell are under different BTSs.

Region Information specifies Whether the BTS serving the calling MS and the BTS serving the called MS are in the same local switching area. If Region Information on the two BTSs is set to the same value, the two BTSs are in the same local switching area.

For the BTS that works in IP transmission mode, BtsLsStartMode is invalid.

Speech Version Selection for the BSS Local Switching Call

To trigger BSS local switching, the speech coding rate of the calling MS must be the same as the speech coding rate of the called MS. If the speech coding rate of the calling MS is different from the speech coding rate of the called MS, the BSC must adjust the speech coding rate of one MS according to that of the other MS through forced switching. If the adjustment fails, BSS local switching is not triggered. If the AMR feature is enabled, the calling MS and the called MS must use the same speech coding rate. In addition, the speech coding rate must remain unchanged.

To select the speech version for a BSS local switching call, you should first identify the speech versions that are supported by both the calling and called MSs. You can select the speech version for the call based on the following principles:

If the speech version used by either MS of the call is supported by the other MS, you can select the speech version for the call based on the policies described in Table 4-1.

Table 4-1 Policies for speech version selection

AMR ACS Consistency

Full- or Half-Rate Channel

Speech Version Adjustment Policy

The AMR feature is enabled on both the calling MS and the called MS.

Consistent Not involved Not involved

The conditions for local switching are met. The speech version adjustment is not required.

Inconsistent Not involved Not involved

The BSC provides a protocol-based preferential rate set. Based on the rate set and the rate of the calling and called MSs, the BSC calculates a new rate adjustment threshold, and generates a new rate set. Then, the BSC adjusts the speech coding rate of the calling MS and the called MS so that they use the same speech coding rate.

If RATSCCHENABLED is set to DISABLE, the speech coding rate is switched to non-AMR rate. In this case, BSS local switching is required.




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4-3

AMR ACS Consistency



Inconsistent

The calling MS uses AMR FR and the called MS uses AMR HR.

Not involved

If SPEECHVERADJUST is set to FRATEPREFERRED (Full-rate Preferred), an AMR call is handed over from a half-rate channel to a full-rate channel.

If SPEECHVERADJUST is set to HRATEPREFERRED (Half-rate Preferred), an AMR call is handed over from a full-rate channel to a half-rate channel.

If the Active Coding Set (ACS) of the calling MS is consistent with that of the called MS, rate adjustment is not required for local switching. If the ACS of the calling MS is inconsistent with that of the called MS, the BSC provides a protocol-based preferential rate set. Based on the ACS of the calling and called MSs and the protocol-based preferential rate set, the BSC calculates a new rate adjustment threshold and generates a new rate set. Then, the BSC adjusts the speech coding rates of both calling and called MSs to ensure that they use the same speech coding rate, and then sets up local switching.

The AMR feature is enabled on one MS of the call. Not involved Not involved

Not involved

Disable the AMR feature. Ensure that the speech coding rate and speech version for one MS are consistent with the speech coding rate and speech version for the other MS.

The AMR feature is disabled for both the calling MS and the called MS. Not involved

Inconsistent Not involved

The speech version needs to be selected according to the setting for SPEECHVERADJUST.

If SPEECHVERADJUST is set to FRATEPREFERRED (Full-rate Preferred), local switching is set up after an AMR call is handed over from a half-rate channel to a full-rate channel.

If SPEECHVERADJUST is set to HRATEPREFERRED (Half-rate Preferred), local switching is set up after an AMR call is handed over from a full-rate channel to a half-rate channel.

Consistent Same

The conditions for local switching are met. The speech version adjustment is not required.

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4-4

AMR ACS Consistency



Different

Change the speech version for the high-rate MS to the speech version for the low-rate MS.

If the speech versions used by the calling and called MSs are different and only one of the two speech versions is supported by both MSs, the supported speech version is selected as the target speech version.

If the calling and called MSs use different speech versions, the highest version is selected as the target version. Speech versions (half-rate or full-rate) of the calling and called MSs can also be selected according to the setting for SPEECHVERADJUST. If SPEECHVERADJUST is set to FRATEPREFERRED (Full-rate Preferred), local switching is set up after an AMR call is handed over from a half-rate channel to a full-rate channel. If SPEECHVERADJUST is set to HRATEPREFERRED (Half-rate Preferred), local switching is set up after an AMR call is handed over from a full-rate channel to a half-rate channel.

In the case of BSC local switching, if the speech version used by the calling MS is the same as the speech version used by the called MS, the BSC sets up a speech signal link, and the signal switching is performed in the BSC. After the signal switching is complete, the BSC releases the redundant resources on the Ater interface.

The speech signals are not sent to the MSC, and therefore the MSC cannot obtain the information about BSC local switching. To ensure the consistency between the circuit resources on the BSC side and the circuit resources on the MSC side, the BSC does not release the circuit identity code (CIC) circuit.

In the case of BTS local switching, if the speech version used by the calling MS is the same as the speech version used by the called MS, the commands sent from the BSC to the BTS varies with the value of SERVICEMODE of the Abis interface.

If SERVICEMODE of the Abis interface is TDM, the BSC sends a link setup command to the BTS. In this case, the speech signals are looped back on the Abis interface of the BTS or the BTS group. After the loopback is successful, the BSC releases the resources on the Abis and Ater interfaces.

If SERVICEMODE of the Abis interface is IP, the BSC sends the IWF to the BTS where the local switching needs to be performed. The BTS then locally loops back the speech frames based on the IWF. After the loopback is successful, the BSC releases the resources on the Abis and Ater interfaces.

4.2 Restoration of the BSS Local Switching Call

Restoration of the BSS local switching call refers to the process through which a call in the local switching state is restored to a normal call. The restoration procedure for the BSC local switching call is different from the restoration procedure for the BTS local switching call.

Restoration of the BSC Local Switching Call

When a BSC local switching call is handed over, the target cell may not support local switching or the outgoing BSC handover may fail. In this case, the BSC local switching call should be restored to a normal call before the handover. In other words, the BSC should re-establish the transmission channel on the Ater interface. Therefore, the speech signals can be sent on the transmission channel to the MSC and then to the MS.







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4-5

The BSC determines whether to restore a BSC local switching call. No manual intervention or data configuration is required.

Restoration of the BTS Local Switching Call

When a BTS local switching call is handed over, the TRX on which the target channel is located may not support local switching or the handover of a specific type may fail. In this case, the BTS local switching call should be restored to a normal call before the handover.

The restoration procedure for a BTS local switching call varies with the setting of SERVICEMODE.

When SERVICEMODE of the Abis interface is set to TDM, the BSC sends a link setup command to the BTS to re-establish a channel on the Abis interface to transfer the speech signals from the Um interface. In addition, the BSC sets up a transmission channel on the Ater interface. Therefore, the speech signals can be sent on the transmission channel to the MSC and then to the MS.

When SERVICEMODE of the Abis interface is set to IP, the BSC sends a local switching restoration command to the BTS to re-establish the route for the transmission of IP datagrams. In addition, the BSC sets up a transmission channel on the Ater interface. Therefore, the speech signals can be sent on the transmission channel to the MSC and then to the MS.

The BSC determines whether to restore a BTS local switching call. No manual intervention or data configuration is required.

4.3 Handover of the BSS Local Switching Call

Intra-BSC Handover

The intra-BSC handover of a BSS local switching call is similar to the intra-BSC handover of a normal call. The only difference is that the speech version for the BSS local switching call cannot be changed after the intra-BSC handover. In other words, the speech version for the call after the handover must be the same as the speech version before the handover. This restriction on the speech version may decrease the handover success rate and increase the call drop rate.

The call is a BSC local switching call.

If the intra-BSC handover is successful, the BSC local switching call may remain as a BSC local switching call, be converted to a BTS local switching call, or be restored to a normal call, depending on the support capability of the target channel for local switching.

If the intra-BSC handover fails, the BSC local switching call remains as a BSC local switching call.

The call is a BTS local switching call.

If the intra-BSC handover is successful, the BTS local switching call may remain as a BTS local switching call, be converted to a BSC local switching call, or be restored to a normal call, depending on the support capability of the target channel for local switching.

If the intra-BSC handover fails and the BSC receives a handover detection message before the handover failure message, the BTS local switching call is restored to a normal call. Otherwise, the BTS local switching call remains as a BTS local switching call.

Outgoing BSC Handover

The procedure for the outgoing BSC handover of a BSS local switching call is as follows:

1. The BSC determines whether to initiate an outgoing BSC handover based on the handover algorithm and sends a handover request to the MSC.

2. The MSC receives the handover request and sends a handover command to the BSC.




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− If the BSC receives the handover command from the MSC, the BSC instructs the peer MS of the handover initiating MS that the call is to be restored to a normal call. This ensures normal speech after the outgoing BSC handover is successful.

− If the BSC does not receive the handover command, the BSS local switching call remains as a BSS local switching call.

− If the BSC receives a handover failure message from the MS, the BSC instructs the MS initiating the handover that the call is to be restored to a normal call.

GSM BSS

BSS Local Switching 5 Impact on CN Services



5-1

5 Impact on CN Services

BSS local switching affects certain services on the CN side, as described in Table 5-1.

Table 5-1 Availability of CN services after BSS local switching being enabled

Service Availability Remarks

Ring Back Tone (RBT) service

Available The RBT service is performed before the called MS answers the phone, and therefore it is not affected by BSS local switching.

Call forwarding services Available The call forwarding services are performed before the called MS answers the phone, and therefore such services are not affected by BSS local switching.

Call restriction supplementary services

Available The call restriction supplementary services are performed before the called MS answers the phone and are controlled by the MSC and HLR. Therefore, such services are not affected by BSS local switching.

Number identification service Available The number identification service is performed before the called MS answers the phone, and therefore it is not affected by BSS local switching.

Unstructured Supplementary Service Data (USSD)

Available The USSD is not related to call service, and therefore it is not affected by BSS local switching.

Closed user group (CUG) Available This service is not related to the switching of the CS speech signals.

Call waiting (CW)/Call hold (CH)

Available None

Three-way calling/Multiparty Service (MPTY)

Available None

Explicit Call Transfer (ECT) Available None

Lawful interception Conditionally available

This service is available only when the Huawei CN equipment is installed.

MSC playing the announcement during a call

Conditionally available


Dual Tone Multi-Frequency (DTMF) number receiving during a call

Unavailable Users who require this service must apply for it. For the users who apply for this service, BSS local switching is not performed.

Speech service and then fax service

Unavailable Only the fax service can be performed. The fax service does not trigger BSS local switching.

Independent billing of BSS local switching

Conditionally available


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BSS Local Switching 5 Impact on CN Services



5-2

Telecom operators can take the following measures to ensure the availability of those CN services that are affected by BSS local switching.

To perform those CN services that become unavailable after BSS local switching is enabled, telecom operators can disable BSS local switching.

To perform those CN services that are conditionally available after BSS local switching is enabled, telecom operators need to install Huawei CN equipment.

− When services such as MSC playing the announcement during a call and lawful interception are performed, Huawei MSC instructs Huawei BSC not to perform local switching or instructs Huawei BSC to convert a BSS local switching call to a normal call.

− When the independent billing of BSS local switching service is performed, Huawei BSC sends a message to the CN whenever Huawei BSC enables or disables BSS local switching. Based on the message sent from the Huawei BSC, the billing center starts or ends the billing of BSS local switching.

The preceding measures help reduce the impact of BSS local switching on CN services and decrease the application restrictions on BSS local switching.

GSM BSS

BSS Local Switching 6 Engineering Guidelines



6-1

6 Engineering Guidelines In Abis over TDM mode, BTS local switching can be performed only after the Flex Abis function is

enabled. In Abis over IP mode, BTS local switching can be performed on calls served by the same BTS and on those served by different BTSs in the same local switching area. BSC local switching is supported in BM/TC separated mode.

In A over IP mode, BSS local switching is not supported.

In BM/TC combined mode, only BTS local switching is supported.

The implementation of BSS local switching may require the cooperation from the MSC. When BSSLSMSCCOOP is set to BASIC(Basic Fun) or ENHANCED(Enhanced Fun), it indicates that BSS local switching is controlled by the MSC. The details are as follows:

− When BSSLSMSCCOOP is set to BASIC(Basic Fun) and the MSC does not allow the BSS local switching of a certain call, the BSC does not perform local switching on the call.

− When BSSLSMSCCOOP is set to ENHANCED(Enhanced Fun) and the MSC does not allow the BSS local switching of a certain call, the BSC does not perform local switching on the call; when the MSC allows the BSS local switching of the call, the BSC performs local switching on the call. In addition, the MSC can charge the local switching calls independently.

In the sites with combined BTS cabinets, BSS local switching can be enabled only when the BTS software and TRX software both support BSS local switching.

BTS local switching and BTS ring topology cannot be enabled for a BTS at the same time.

If the calling MS and the called MS are registered on two different MSCs, BSS local switching is not supported regardless of whether the two MSCs are connected to the same MGW or different MGWs.

In HDLC transmission mode, BSS local switching is not supported.

../RNCParaHtml/mbsc/m-para/gcnnode_bsslsmsccoop.html



GSM BSS

BSS Local Switching 7 Parameters



7-1

7 Parameters

Table 7-1 Parameter description

Parameter ID NE MML Command Description

AbisJamThreshold2StartLs BSC6900 SET BSSLS Meaning: Threshold for enabling the BTS local switching. When the congestion rate at the Abis interface exceeds this threshold, the BTS local switching is enabled.

GUI Value Range: 0~100

Actual Value Range: 0~100

Default Value: 90

Unit: %

AterJamThreshold2StartLs BSC6900 SET BSSLS Meaning: Threshold for enabling the BSC local switching. When the congestion rate at the Ater interface exceeds this threshold, the function is enabled.

GUI Value Range: 0~100

Actual Value Range: 0~100

Default Value: 90

Unit: %

BSSLSMSCCOOP BSC6900 ADD GCNNODE

MOD GCNNODE

Meaning: Type of the BSS local switching with the cooperation of the MSC.

NONSUPPORT: When performing local switching, the BSS need not determine whether the MSC allows an MS to be involved in local switching.

BASIC: Assignment request messages and handover request messages sent by the MSC contain a flag indicating whether to allow an MS for local switching. The BSS must identify this flag when performing local switching.

ENHANCED: Assignment request messages and handover request messages sent by the MSC contain a flag indicating whether to allow an MS for local switching. The BSS must identify this flag when performing local switching. In addition, when the BSS enables or stops local switching, the BSS sends a local switching enabled or stopped message to the MSC.

GUI Value Range: NONSUPPORT(Not Support), BASIC(Basic Fun),

../RNCParaHtml/mbsc/m-para/bssls_abisjamthreshold2startls.html

../RNCParaHtml/mbsc/m-mml/set-bssls.html

../RNCParaHtml/mbsc/m-para/bssls_aterjamthreshold2startls.html



../RNCParaHtml/mbsc/m-mml/add-gcnnode.html

../RNCParaHtml/mbsc/m-mml/mod-gcnnode.html

GSM BSS




7-2


ENHANCED(Enhanced Fun)

Actual Value Range: NONSUPPORT, BASIC, ENHANCED

Default Value: NONSUPPORT(Not Support)

Unit: None

BscLsStartMode BSC6900 SET BSSLS Meaning: Conditions for enabling the function of BSC6900 local switching.

UNCONDITIONALSTART: The function of BSC6900 local switching is enabled without restriction.

ATERCONGESTS: The function of BSC6900 local switching is enabled when the congestion rate of the Ater interface exceeds the value of "Ater Cong Thres for BSC6900 LocalSwitch".

PREFIXNUMBER: The function of BSC6900 local switching is enabled when the leading digits of the calling or called MSISDN are the preset value of "Prefix Number for BSC6900 (1-10)".

GUI Value Range: UNCONDITIONALSTART(Unconditional Start), ATERCONGESTS(Start When Ater Congests), PREFIXNUMBER(Start by Prefix Number)

Actual Value Range: UNCONDITIONALSTART, ATERCONGESTS, PREFIXNUMBER

Default Value: UNCONDITIONALSTART(Unconditional Start)

Unit: None

BssLsGenMode BSC6900 SET BSSLS Meaning: General strategy of the BSS local switching, which includes the BSC local switching and the BTS local switching. The two functions cannot be enabled at the same time.

GUI Value Range: NEITHERSTART(Neither Start), BTSPRIORITY(BTS Priority), BSCPRIORITY(BSC Priority), BTSONLY(BTS Only), BSCONLY(BSC Only)

Actual Value Range: NEITHERSTART, BTSPRIORITY, BSCPRIORITY, BTSONLY, BSCONLY

Default Value: NEITHERSTART(Neither





GSM BSS




7-3


Start)

Unit: None

BtsLsStartMode BSC6900 SET BSSLS Meaning: Conditions for enabling the function of BTS local switching.

UNCONDITIONALSTART: The function of BTS local switching is enabled without restriction.

ABISCONGESTS: The function of BTS local switching is enabled when the congestion rate of the Abis interface exceeds the value of "Abis Cong Thres for BTS LocalSwitch".

PREFIXNUMBER: The function of BTS local switching is enabled when the leading digits of the calling or called MSISDN are the preset value of "Prefix Number for BTS (1-10)".

GUI Value Range: UNCONDITIONALSTART(Unconditional Start), ABISCONGESTS(Start When Abis Congests), PREFIXNUMBER(Start by Prefix Number)

Actual Value Range: UNCONDITIONALSTART, ABISCONGESTS, PREFIXNUMBER

Default Value: UNCONDITIONALSTART(Unconditional Start)

Unit: None

ISSUPPORTBTSLSWITCH BSC6900 SET BTSLSW Meaning: Whether a BTS supports the local switching function.

GUI Value Range: NO(No), YES(Yes)

Actual Value Range: NO, YES

Default Value: NO(No)

Unit: None

MsisdnSegList2AvoidBscLs1 BSC6900 SET BSSLS Meaning: If the first digits in the MSISDN of the called or calling are the same as the value of this parameter, the BSC local switching function is disabled.

GUI Value Range: 1~32 characters

Actual Value Range: 1~32 characters

Default Value: ####

Unit: None

MsisdnSegList2AvoidBscLs10 BSC6900 SET BSSLS Meaning: If the first digits in the MSISDN of the called or calling are the same as




../RNCParaHtml/mbsc/m-mml/set-btslsw.html





GSM BSS




7-4


the value of this parameter, the BSC local switching function is disabled.



Default Value: ####

Unit: None

MsisdnSegList2AvoidBtsLs1 BSC6900 SET BSSLS Meaning: If the first digits in the MSISDN of the called or calling are the same as the value of this parameter, the BTS local switching function is disabled.



Default Value: ####

Unit: None

MsisdnSegList2AvoidBtsLs10 BSC6900 SET BSSLS Meaning: If the first digits in the MSISDN of the called or calling are the same as the value of this parameter, the BTS local switching function is disabled.



Default Value: ####

Unit: None

RATSCCHENABLED BSC6900 SET GCELLCCAMR

Meaning: This parameter specifies whether the RATSCCH function is enabled during the call establishment procedure. RATSCCH is used to dynamically reconfigure the rate set of AMR while on a call. This parameter maps the versions of base stations. This parameter does not take effect in A over IP mode. In A over IP mode, the TC is integrated into the UMG.

GUI Value Range: DISABLE(Disable), ENABLE(Enable)

Actual Value Range: DISABLE, ENABLE

Default Value: DISABLE(Disable)

Unit: None

REGION BSC6900 SET BTSLSW Meaning: Region information of the IP BTS configured with local switching. Local switching can be performed between only the BTSs that have the same region information.If this parameter is set to 255, the resion information are invalid.





../RNCParaHtml/mbsc/m-para/gcellccamr_ratscchenabled.html

../RNCParaHtml/mbsc/m-mml/set-gcellccamr.html

../RNCParaHtml/mbsc/m-mml/set-gcellccamr.html

../RNCParaHtml/mbsc/m-para/btslsw_region.html

../RNCParaHtml/mbsc/m-mml/set-btslsw.html

GSM BSS




7-5


GUI Value Range: 0~95;255

Actual Value Range: 0~95, 255

Default Value: None

Unit: None

SPEECHVERADJUST BSC6900 SET BSSLS Meaning: Strategy for adjusting speech versions for the function of BSC local switching to take effect. When the function of BSC local switching is enabled, speech versions of two connected calls must be consistent for the function to take effect. Currently, when this function is enabled but speech versions of two connected calls are different, one call using a half-rate channel is handed over to a full-rate channel. This solution prevents speech quality from being affected, which occurs if one call using a full-rate channel is handed over to a half-rate channel. This solution, however, results in a high TCH congestion rate when traffic in the corresponding cell is heavy.

When this parameter is set to Full-rate Preferred, one call using a half-rate channel is handed over to a full-rate channel to enable the function to take effect.When this parameter is set to Half-rate Preferred, one call using a full-rate channel is handed over to a half-rate channel to enable the function to take effect.

GUI Value Range: FRATEPREFERRED(Full-rate Preferred), HRATEPREFERRED(Half-rate Preferred)

Actual Value Range: FRATEPREFERRED, HRATEPREFERRED

Default Value: HRATEPREFERRED(Half-rate Preferred)

Unit: None

ServiceMode BSC6900 SET BSCBASIC Meaning: Service mode of the BSC6900. This parameter specifies configuration mode of subracks.

GUI Value Range: SEPARATE(Separate), TOGETHER(Together)




../RNCParaHtml/mbsc/m-mml/set-bscbasic.html

GSM BSS




7-6


Actual Value Range: SEPARATE, TOGETHER

Default Value: SEPARATE(Separate)

Unit: None

GSM BSS

BSS Local Switching 8 Counters



8-1

8 Counters

Table 8-1 Counter description

Counter ID Counter Name Counter Description

Feature ID

1278072637 CELL.LOOP.START.FAIL.DROPS.TCHH RM3273:Call Drops Due to Local Switch Start Failure(TCHH)

GBFD-117701

GBFD-117702

1278072638 CELL.LOOP.START.FAIL.DROPS.TCHF RM3173:Call Drops Due to Local Switch Start Failure(TCHF)

GBFD-117701

GBFD-117702

1278072639 CELL.LOOP.RESTORE.FAIL.DROPS.TCHH RM3274:Call Drops Due to Failures to Return to Normal Call from Local Switch (TCHH)

GBFD-117701

GBFD-117702

1278072640 CELL.LOOP.RESTORE.FAIL.DROPS.TCHF RM3174:Call Drops Due to Failures to Return to Normal Call from Local Switch (TCHF)

GBFD-117701

GBFD-117702

1278077510 CELL.INTRACELL.HO.REQ.BSC.LOOP H300a:Internal Intra-Cell Handover Requests (BSC LOOP)

GBFD-117701

1278077511 CELL.INTRACELL.HO.REQ.BTS.LOOP H300b:Internal Intra-Cell Handover Requests (BTS LOOP)

GBFD-117702

1278077512 CELL.INTRACELL.HO.CMD.BSC.LOOP H301a:Internal Intra-Cell Handover Commands (BSC LOOP)

GBFD-117701

1278077513 CELL.INTRACELL.HO.CMD.BTS.LOOP H301b:Internal Intra-Cell Handover Commands (BTS LOOP)

GBFD-117702

../RNCCounterHtml/mbsc/m-perf/Mt-26722.html








GSM BSS




8-2


Feature ID

1278077514 CELL.INTRACELL.HO.FAIL.BSC.LOOP H302a:Failed Internal Intra-Cell Handovers (BSC LOOP)

GBFD-117701

1278077515 CELL.INTRACELL.HO.FAIL.BTS.LOOP H302:Failed Internal Intra-Cell Handovers (BTS LOOP)

GBFD-117702

1278077516 CELL.INTRACELL.HO.DETECT.BSC.LOOP H304a:Internal Intra-Cell Handover Detection Messages Received by BSC LOOP

GBFD-117701

1278077517 CELL.INTRACELL.HO.DETECT.BTS.LOOP H304b:Internal Intra-Cell Handover Detection Messages Received by BTS LOOP

GBFD-117702

1278077518 CELL.INTRACELL.HO.SUCC.BSC.LOOP CH300a:Number of Intra-BSC Intra-Cell Handover Successes During BSC Local Switch

GBFD-117701

1278077519 CELL.INTRACELL.HO.SUCC.RATE.BSC.LOOP TH300a:Success Rate of Intra-BSC Intra-Cell Handover During BSC Local Switch

GBFD-117701

1278077520 CELL.INTRACELL.HO.SUCC.BTS.LOOP CH300b:Number of Intra-BSC Intra-Cell Handover Successes During BTS Local Switch

GBFD-117702








GSM BSS




8-3


Feature ID

1278077521 CELL.INTRACELL.HO.SUCC.RATE.BTS.LOOP TH300b:Success Rate of Intra-BSC Intra-Cell Handover During BTS Local Switch

GBFD-117702

1278078466 CELL.INTRABSC.INCELL.HO.REQ.BSC.LOOP H320a:Number of Incoming Internal Inter-Cell Handover Requests During BSC Local Switch

GBFD-117701

1278078467 CELL.INTRABSC.INCELL.HO.REQ.BTS.LOOP H320b:Number of Incoming Internal Inter-Cell Handover Requests During BTS Local Switch

GBFD-117702

1278078468 CELL.INTRABSC.INCELL.HO.CMD.BSC.LOOP H321a:Number of Incoming Internal Inter-Cell Handover Commands During BSC Local Switch

GBFD-117701

1278078469 CELL.INTRABSC.INCELL.HO.CMD.BTS.LOOP H321b:Number of Incoming Internal Inter-Cell Handover Commands During BTS Local Switch

GBFD-117702

1278078470 CELL.INTRABSC.INCELL.HO.FAIL.BSC.LOOP H322a:Number of Unsuccessful Incoming Internal Inter-Cell Handovers During BSC Local Switch

GBFD-117701







GSM BSS




8-4


Feature ID

1278078471 CELL.INTRABSC.INCELL.HO.FAIL.BTS.LOOP H322:Number of Unsuccessful Incoming Internal Inter-Cell Handovers During BTS Local Switch

GBFD-117702

1278078472 CELL.INTRABSC.INCELL.HO.DETECT.BSC.LOOP H32aa:Number of Incoming Internal Inter-Cell Handover Detection Messages Received by BSC During BSC Local Switch

GBFD-117701

1278078473 CELL.INTRABSC.INCELL.HO.DETECT.BTS.LOOP H32ab:Number of Incoming Internal Inter-Cell Handover Detection Messages Received by BSC During BTS Local Switch

GBFD-117702

1278078474 CELL.INTRABSC.INCELL.HO.SUCC.BSC.LOOP CH320a:Number of Successful Incoming Internal Inter-Cell Handovers During BSC Local Switch

GBFD-117701

1278078475 CELL.INTRABSC.INCELL.HO.SUCC.RATE.BSC.LOOP TH320a:Success Rate of Incoming Internal Inter-Cell Handovers During BSC Local Switch

GBFD-117701






GSM BSS




8-5


Feature ID

1278078476 CELL.INTRABSC.INCELL.HO.SUCC.BTS.LOOP CH320b:Number of Successful Incoming Internal Inter-Cell Handovers During BTS Local Switch

GBFD-117702

1278078477 CELL.INTRABSC.INCELL.HO.SUCC.RATE.BTS.LOOP TC320b:Success Rate of Incoming Internal Inter-Cell Handovers During BTS Local Switch

GBFD-117702

1278079534 CELL.INTRABSC.OUTCELL.HO.REQ.BSC.LOOP H370a:Number of Outgoing Internal Inter-Cell Handover Requests During BSC Local Switch

GBFD-117701

1278079535 CELL.INTRABSC.OUTCELL.HO.REQ.BTS.LOOP H370b:Number of Outgoing Internal Inter-Cell Handover Requests During BTS Local Switch

GBFD-117702

1278079536 CELL.INTRABSC.OUTCELL.HO.CMD.BSC.LOOP H311Aa:Number of Outgoing Internal Inter-Cell Handover Commands During BSC Local Switch

GBFD-117701

1278079537 CELL.INTRABSC.OUTCELL.HO.CMD.BTS.LOOP H311Ab:Number of Outgoing Internal Inter-Cell Handover Commands During BTS Local Switch

GBFD-117702







GSM BSS




8-6


Feature ID

1278079538 CELL.INTRABSC.OUTCELL.HO.FAIL.BSC.LOOP H312Aa:Number of Unsuccessful Outgoing Internal Inter-Cell Handovers During BSC Local Switch

GBFD-117701

1278079539 CELL.INTRABSC.OUTCELL.HO.FAIL.BTS.LOOP H312Ab:Number of Unsuccessful Outgoing Internal Inter-Cell Handovers During BTS Local Switch

GBFD-117702

1278079540 CELL.INTRABSC.OUTCELL.HO.SUCC.BSC.LOOP CH370a:Number of Successful Outgoing Internal Inter-Cell Handovers During BSC Local Switch

GBFD-117701

1278079541 CELL.INTRABSC.OUTCELL.HO.SUCC.RATE.BSC.LOOP TH370a:Success Rate of Outgoing Internal Inter-Cell Handovers During BSC Local Switch

GBFD-117701

1278079542 CELL.INTRABSC.OUTCELL.HO.SUCC.BTS.LOOP CH370b:Number of Successful Outgoing Internal Inter-Cell Handovers During BTS Local Switch

GBFD-117702

1278079543 CELL.INTRABSC.OUTCELL.HO.SUCC.RATE.BTS.LOOP TH370b:Success Rate of Outgoing Internal Inter-Cell Handovers During BTS Local Switch

GBFD-117702







GSM BSS




8-7


Feature ID

1278081566 CELL.INTERBSC.OUTCELL.HO.REQ.BSC.LOOP H333a:Number of Outgoing External Inter-Cell Handover Requests During BSC Local Switch

GBFD-117701

1278081567 CELL.INTERBSC.OUTCELL.HO.REQ.BTS.LOOP H333b:Number of Outgoing External Inter-Cell Handover Requests During BTS Local Switch

GBFD-117702

1278081568 CELL.INTERBSC.OUTCELL.HO.CMD.BSC.LOOP H331Aa:Number of Outgoing External Inter-Cell Handover Commands During BSC Local Switch

GBFD-117701

1278081569 CELL.INTERBSC.OUTCELL.HO.CMD.BTS.LOOP H371P:Number of Outgoing External Inter-Cell Handover Commands During BTS Local Switch

GBFD-117702

1278081570 CELL.INTERBSC.OUTCELL.HO.FAIL.BSC.LOOP H332Aa:Number of Outgoing External Inter-Cell Handover Failures During BSC Local Switch

GBFD-117701

1278081571 CELL.INTERBSC.OUTCELL.HO.FAIL.BTS.LOOP H332Ab:Number of Outgoing External Inter-Cell Handover Failures During BTS Local Switch

GBFD-117702







GSM BSS




8-8


Feature ID

1278081572 CELL.INTERBSC.OUTCELL.HO.SUCC.BSC.LOOP CH333a:Number of Outgoing External Inter-Cell Handover Successes During BSC Local Switch

GBFD-117701

1278081573 CELL.INTERBSC.OUTCELL.HO.SUCC.RATE.BSC.LOOP TH333a:Success Rate of Outgoing External Inter-Cell Handovers During BSC Local Switch

GBFD-117701

1278081574 CELL.INTERBSC.OUTCELL.HO.SUCC.BTS.LOOP CH333b:Number of Outgoing External Inter-Cell Handover Successes During BTS Local Switch

GBFD-117702

1278081575 CELL.INTERBSC.OUTCELL.HO.SUCC.RATE.BTS.LOOP TH333b:Success Rate of Outgoing External Inter-Cell Handovers During BTS Local Switch

GBFD-117702

1278083476 CELL.INTERRAN.OUTCELL.HO.REQ.BSC.LOOP H353a:Number of Inter-RAT Outgoing Cell Handover Requests During BSC Local Switch

GBFD-117701

1278083477 CELL.INTERRAN.OUTCELL.HO.REQ.BTS.LOOP H353b:Number of Inter-RAT Outgoing Cell Handover Requests During BTS Local Switch

GBFD-117702







GSM BSS




8-9


Feature ID

1278083478 CELL.INTERRAN.OUTCELL.HO.CMD.BSC.LOOP H351Aa:Number of Inter-RAT Outgoing Cell Handovers During BSC Local Switch

GBFD-117701

1278083479 CELL.INTERRAN.OUTCELL.HO.CMD.BTS.LOOP H351Ab:Number of Inter-RAT Outgoing Cell Handovers During BTS Local Switch

GBFD-117702

1278083480 CELL.INTERRAN.OUTCELL.HO.FAIL.BSC.LOOP H352Aa:Number of Inter-RAT Outgoing Cell Handover Failures During BSC Local Switch

GBFD-117701

1278083481 CELL.INTERRAN.OUTCELL.HO.FAIL.BTS.LOOP H352Ab:Number of Inter-RAT Outgoing Cell Handover Failures During BTS Local Switch

GBFD-117702

1278083482 CELL.INTERRAN.OUTCELL.HO.SUCC.BSC.LOOP CH353a:Number of Inter-RAT Outgoing Cell Handover Successes During BSC Local Switch

GBFD-117701

1278083483 CELL.INTERRAN.OUTCELL.HO.SUCC.RATE.BSC.LOOP TH353a:Success Rate of Inter-RAT Outgoing Cell Handover During BSC Local Switch

GBFD-117701

1278083484 CELL.INTERRAN.OUTCELL.HO.SUCC.BTS.LOOP CH353b:Number of Inter-RAT Outgoing Cell Handover Successes During BTS Local Switch

GBFD-117702








GSM BSS




8-10


Feature ID

1278083485 CELL.INTERRAN.OUTCELL.HO.SUCC.RATE.BTS.LOOP TH353b:Success Rate of Inter-RAT Outgoing Cell Handover During BTS Local Switch

GBFD-117702

1278089417 CELL.LOCALSWITCH.LOOP.CALL.DETECT R380:Number of Call Detect Messages Originated during Local Switching

GBFD-117701

GBFD-117702

1278089418 CELL.LOCALSWITCH.LOOP.START.TRY R381:Number of local switching Start Attempts

GBFD-117701

GBFD-117702

1278089419 CELL.LOCALSWITCH.LOOP.FAIL.NO.LOOP.POLICY R3820:Number of local switching Start Failures (No local switching Policy Available)

GBFD-117701

GBFD-117702

1278089420 CELL.LOCALSWITCH.LOOP.FAIL.SVR.ADJUST.FAIL R3821:Number of local switching Start Failures (Speech Version Adjustment Failure)

GBFD-117701

GBFD-117702

1278089421 CELL.LOCALSWITCH.LOOP.FAIL.INVALID.STATE R3822:Number of local switching Start Failures (Invalid State)

GBFD-117701

GBFD-117702

1278089422 CELL.LOCALSWITCH.LOOP.FAIL.BTS.FAIL R3823:Number of local switching Start Failures (Failures on the BTS Side)

GBFD-117701

GBFD-117702

1278089423 CELL.LOCALSWITCH.LOOP.FAIL.APPLY.TRSL.FAIL R3824:Number of local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117701

GBFD-117702









GSM BSS




8-11


Feature ID

1278089424 CELL.LOCALSWITCH.LOOP.FAIL.EXP R3825:Number of local switching Start Failure (Timer Expired)

GBFD-117701

GBFD-117702

1278089425 CELL.LOCALSWITCH.LOOP.FAIL.BTS.NOT.SUPPORT R3826:Number of local switching Start Failures (Not Support by the BTS)

GBFD-117701

GBFD-117702

1278089426 CELL.LOCALSWITCH.LOOP.FAIL.OTHER R3827:Number of local switching Start Failures (Other Causes)

GBFD-117701

GBFD-117702

1278089427 CELL.LOCALSWITCH.BTSLOOP.HO.BTS.LOOP.FAIL R382a:Number of BTS local switching Failures after the Handover during the BTS local switching

GBFD-117702

1278089428 CELL.LOCALSWITCH.BTSLOOP.HO.BSC.LOOP.FAIL R382b:Number of BSC local switching Failures after the Handover during the BTS local switching

GBFD-117701

GBFD-117702

1278089429 CELL.LOCALSWITCH.BSCLOOP.HO.BTS.LOOP.FAIL R382c:Number of BTS local switching Failures after the Handover during the BSC local switching

GBFD-117701

GBFD-117702

1278089430 CELL.LOCALSWITCH.BSCLOOP.HO.BSC.LOOP.FAIL R382d:Number of BSC local switching Failures after the Handover during the BSC local switching

GBFD-117701

1278089431 CELL.LOCALSWITCH.BSCLOOP.SUCCESS R3830:Number of Successful BSC local switching Attempts

GBFD-117701









GSM BSS




8-12


Feature ID

1278089432 CELL.LOCALSWITCH.BTSLOOP.SUCCESS R3831:Number of Successful BTS local switching Attempts

GBFD-117702

1278089433 CELL.LOCALSWITCH.BTSLOOP.HO.BSCLOOP.SUCCESS R3830a:Number of Successful BSC local switching Attempts after the Handover during the BTS local switching

GBFD-117701

GBFD-117702

1278089434 CELL.LOCALSWITCH.BTSLOOP.HO.BTSLOOP.SUCCESS R3831a:Number of Successful BTS local switching Attempts after the Handover during the BTS local switching

GBFD-117702

1278089435 CELL.LOCALSWITCH.BSCLOOP.HO.BSCLOOP.SUCCESS R3830b:Number of Successful BSC local switching Attempts after the Handover during the BSC local switching

GBFD-117701

1278089436 CELL.LOCALSWITCH.BSCLOOP.HO.BTSLOOP.SUCCESS R3831b:Number of Successful BTS local switching Attempts after the Handover during the BSC local switching

GBFD-117701

GBFD-117702

1278089437 CELL.LOOP.START.FAIL CR382:Number of Local Swithching Start Failures

GBFD-117701

GBFD-117702

1278089438 CELL.LOCALSWITCH.RESTORE.TRY.BSC.LOOP R3840:Number of Attempts to Return to Normal Call from BSC local switching

GBFD-117701








GSM BSS




8-13


Feature ID

1278089439 CELL.LOCALSWITCH.RESTORE.TRY.BTS.LOOP R3841:Number of Attempts to Return to Normal Call from BTS local switching

GBFD-117702

1278089440 CELL.LOCALSWITCH.LOOP.RESTORE.APPLY.TRSL.FAIL.BSC.LOOP R3850a:Number of Failures to Return to Normal Call from BSC local switching (Terrestrial Resource Request Failure)

GBFD-117701

1278089441 CELL.LOCALSWITCH.LOOP.RESTORE.APPLY.TRSL.FAIL.BTS.LOOP R3851a:Number of Failures to Return to Normal Call from BTS local switching (Terrestrial Resource Request Failure)

GBFD-117702

1278089442 CELL.LOCALSWITCH.LOOP.RESTORE.OTHER.FAIL.BSC.LOOP R3850b:Number of Failures to Return to Normal Call from BSC local switching (Others)

GBFD-117701

1278089443 CELL.LOCALSWITCH.LOOP.RESTORE.OTHER.FAIL.BTS.LOOP R3851b:Number of Failures to Return to Normal Call from BTS local switching (Others)

GBFD-117702

1278089444 CELL.BSC.LOOP.RESTORE.FAIL CR3850:Number of Failures to Return to Normal Call from BSC local switching

GBFD-117701

1278089445 CELL.BTS.LOOP.RESTORE.FAIL CR3851:Number of Failures to Return to Normal Call from BTS local switching

GBFD-117702








GSM BSS




8-14


Feature ID

1278089446 CELL.BSC.LOOP.RESTORE.SUCC R3860:Number of Successful Attempts to Return to Normal Call from BSC local switching

GBFD-117701

1278089447 CELL.BTS.LOOP.RESTORE.SUCC R3861:Number of Successful Attempts to Return to Normal Call from BTS local switching

GBFD-117702

1278089448 CELL.BSC.LOOP.RESTORE.RATE TR3860:BSC local switching to Normal Call Success Rate

GBFD-117701

1278089449 CELL.BTS.LOOP.RESTORE.RATE TR3861:BTS local switching to Normal Call Success Rate

GBFD-117702

1278089450 CELL.CALL.DROPS.BSCLOOP.FAIL.APPLY.TRSL.FAIL M3720:Call Drops due to BSC local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117701

1278089451 CELL.CALL.DROPS.BSCLOOP.FAIL.OTHER M3721:Call Drops due to BSC local switching Start Failure (Others)

GBFD-117701

1278089452 CELL.CALL.DROPS.BTSLOOP.FAIL.APPLY.TRSL.FAIL M3820:Call Drops due to BTS local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117702

1278089453 CELL.CALL.DROPS.BTSLOOP.FAIL.BTS.FAIL M3821:Call Drops due to BTS local switching Start Failure (Failures on the BTS Side)

GBFD-117702









GSM BSS




8-15


Feature ID

1278089454 CELL.CALL.DROPS.BTSLOOP.FAIL.OTHER M3822:Call Drops due to BTS local switching Start Failure (Others)

GBFD-117702

1278089455 CELL.CALL.DROPS.LOOP.FAIL.EXP M390:Call Drops due to local switching Start Failure (Timer Expired)

GBFD-117701

GBFD-117702

1278089456 CELL.LOOP.START.FAIL.DROPS CM397:Call Drops due to local switching Start Failure

GBFD-117701

GBFD-117702

1278089457 CELL.CALL.DROPS.LOOP.HO.FAIL CM398:Call Drops due to Handover Failure During the local switching

GBFD-117701

GBFD-117702

1278089458 CELL.CALL.DROPS.CONN.FAIL.BSC.LOOP M3701:Call Drops due to Connection Failures in Stable BSC local switching State

GBFD-117701

1278089459 CELL.CALL.DROPS.CONN.FAIL.BTS.LOOP M3801:Call Drops due to Connection Failures in Stable BTS local switching State

GBFD-117702

1278089460 CELL.CALL.DROPS.ERR.IND.BSC.LOOP M3700:Call Drops due to Error Indications in Stable BSC local switching State

GBFD-117701

1278089461 CELL.CALL.DROPS.ERR.IND.BTS.LOOP M3800:Call Drops due to Error Indications in Stable BTS local switching State

GBFD-117702









GSM BSS




8-16


Feature ID

1278089462 CELL.CALL.DROPS.REL.IND.BSC.LOOP M3702:Call Drops due to Release Indications in Stable BSC local switching State

GBFD-117701

1278089463 CELL.CALL.DROPS.REL.IND.BTS.LOOP M3802:Call Drops due to Release Indications in Stable BTS local switching State

GBFD-117702

1278089464 CELL.CALL.DROPS.NO.MR.BSC.LOOP M372:Call Drops due to No MRs from MS in Stable BSC local switching State

GBFD-117701

1278089465 CELL.CALL.DROPS.NO.MR.BTS.LOOP M382:Call Drops due to No MRs from MS in Stable BTS local switching State

GBFD-117702

1278089466 CELL.CALL.DROPS.FORCE.HO.BSC.LOOP M375:Call Drops due to Forced Handovers in Stable BSC local switching State

GBFD-117701

1278089467 CELL.CALL.DROPS.FORCE.HO.BTS.LOOP M385:Call Drops due to Forced Handovers in Stable BTS local switching State

GBFD-117702

1278089468 CELL.CALL.DROPS.ABIS.LNK.FAIL.BSC.LOOP M373:Call Drops due to Abis Terrestrial Link Failure in Stable BSC local switching State

GBFD-117701

1278089469 CELL.CALL.DROPS.ABIS.LNK.FAIL.BTS.LOOP M383:Call Drops due to Abis Terrestrial Link Failure in Stable BTS local switching State

GBFD-117702









GSM BSS




8-17


Feature ID

1278089470 CELL.CALL.DROPS.EQUIP.FAIL.BSC.LOOP M374:Call Drops due to Equipment Failures in Stable BSC local switching State

GBFD-117701

1278089471 CELL.CALL.DROPS.EQUIP.FAIL.BTS.LOOP M384:Call Drops due to Equipment Failures in Stable BTS local switching State

GBFD-117702

1278089472 CELL.TRAF.CH.STATIC.STATE.CALL.DROPS.BSC.LOOP CM370:Call Drops in Stable BSC local switching State

GBFD-117701

1278089473 CELL.TRAF.CH.STATIC.STATE.CALL.DROPS.BTS.LOOP CM380:Call Drops in Stable BTS local switching State

GBFD-117702

1278089474 CELL.CALL.DROPS.LOOP.RESTORE.APPLY.TRSL.FAIL.BSC.LOOP M3751:Call Drops due to Failures to Return to Normal Call from BSC local switching (Terrestrial Resource Request Failure)

GBFD-117701

1278089475 CELL.CALL.DROPS.LOOP.RESTORE.APPLY.TRSL.FAIL.BTS.LOOP M3851:Call Drops due to Failures to Return to Normal Call from BTS local switching (Terrestrial Resource Request Failure)

GBFD-117702

1278089476 CELL.CALL.DROPS.LOOP.RESTORE.OTHER.FAIL.BSC.LOOP M3752:Call Drops due to Failures to Return to Normal Call from BSC local switching (Others)

GBFD-117701








GSM BSS




8-18


Feature ID

1278089477 CELL.CALL.DROPS.LOOP.RESTORE.OTHER.FAIL.BTS.LOOP M3852:Call Drops due to Failures to Return to Normal Call from BTS local switching (Others)

GBFD-117702

1278089478 CELL.LOOP.RESTORE.FAIL.DROPS CM385:Call Drops due to Failures to Return to Normal Call from local switching

GBFD-117701

GBFD-117702

1278089479 CELL.LOOP.DROPS CM390:Call Drops During local switching

GBFD-117701

GBFD-117702

1278089480 CELL.CALL.DROPS.BSCLOOP.FAIL.APPLY.TRSL.FAIL.TCHF M3120:Call Drops on TCHF Due to BSC local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117701

1278089481 CELL.CALL.DROPS.BSCLOOP.FAIL.APPLY.TRSL.FAIL.TCHH M3220:Call Drops on TCHH Due to BSC local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117701

1278089482 CELL.CALL.DROPS.BSCLOOP.FAIL.OTHER.TCHF M3121:Call Drops on TCHF Due to BSC local switching Start Failure (Others)

GBFD-117701

1278089483 CELL.CALL.DROPS.BSCLOOP.FAIL.OTHER.TCHH M3221:Call Drops on TCHH Due to BSC local switching Start Failure (Others)

GBFD-117701








GSM BSS




8-19


Feature ID

1278089484 CELL.CALL.DROPS.BTSLOOP.FAIL.APPLY.TRSL.FAIL.TCHF M3120a:Call Drops on TCHF Due to BTS local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117702

1278089485 CELL.CALL.DROPS.BTSLOOP.FAIL.APPLY.TRSL.FAIL.TCHH M3220a:Call Drops on TCHH Due to BTS local switching Start Failure (Terrestrial Resource Request Failure)

GBFD-117702

1278089486 CELL.CALL.DROPS.BTSLOOP.FAIL.BTS.FAIL.TCHF M3121a:Call Drops on TCHF Due to BTS local switching Start Failure (Failures on the BTS Side)

GBFD-117702

1278089487 CELL.CALL.DROPS.BTSLOOP.FAIL.BTS.FAIL.TCHH M3221a:Call Drops on TCHH Due to BTS local switching Start Failure (Failures on the BTS Side)

GBFD-117702

1278089488 CELL.CALL.DROPS.BTSLOOP.FAIL.OTHER.TCHF M3122:Call Drops on TCHF Due to BTS local switching Start Failure (Others)

GBFD-117702

1278089489 CELL.CALL.DROPS.BTSLOOP.FAIL.OTHER.TCHH M3222:Call Drops on TCHH Due to BTS local switching Start Failure (Others)

GBFD-117702

1278089490 CELL.CALL.DROPS.LOOP.FAIL.TIMEOUT.TCHF M310:Call Drops on TCHF Due to local switching Start Failure (Timer Expired)

GBFD-117701








GSM BSS




8-20


Feature ID

1278089491 CELL.CALL.DROPS.LOOP.FAIL.TIMEOUT.TCHH M320:Call Drops on TCHH Due to local switching Start Failure (Timer Expired)

GBFD-117701

GBFD-117702

1278089492 CELL.CALL.DROPS.LOOP.HO.FAIL.TCHF CM318:Call Drops on TCHF Due to Handover Failure During the local switching

GBFD-117701

GBFD-117702

1278089493 CELL.CALL.DROPS.LOOP.HO.FAIL.TCHH CM328:Call Drops on TCHH Due to Handover Failure During the local switching

GBFD-117701

GBFD-117702

1278089494 CELL.CALL.DROPS.LOOP.RESTORE.APPLY.TRSL.FAIL.TIMES.BSC.LOOP.TCHF M3151:Call Drops on TCHF Due to Failures to Return to Normal Call from BSC local switching (Terrestrial Resource Request Failure)

GBFD-117701

1278089495 CELL.CALL.DROPS.LOOP.RESTORE.APPLY.TRSL.FAIL.TIMES.BSC.LOOP.TCHH M3251:Call Drops on TCHH Due to Failures to Return to Normal Call from BSC local switching (Terrestrial Resource Request Failure)

GBFD-117701

1278089496 CELL.CALL.DROPS.LOOP.RESTORE.APPLY.TRSL.FAIL.TIMES.BTS.LOOP.TCHF M3151a:Call Drops on TCHF Due to Failures to Return to Normal Call from BTS local switching (Terrestrial Resource Request Failure)

GBFD-117702







GSM BSS




8-21


Feature ID

1278089497 CELL.CALL.DROPS.LOOP.RESTORE.APPLY.TRSL.FAIL.TIMES.BTS.LOOP.TCHH M3251a:Call Drops on TCHH Due to Failures to Return to Normal Call from BTS local switching (Terrestrial Resource Request Failure)

GBFD-117702

1278089498 CELL.CALL.DROPS.LOOP.RESTORE.OTHER.FAIL.TIMES.BSC.LOOP.TCHF M3152:Call Drops on TCHF Due to Failures to Return to Normal Call from BSC local switching (Others)

GBFD-117701

1278089499 CELL.CALL.DROPS.LOOP.RESTORE.OTHER.FAIL.TIMES.BSC.LOOP.TCHH M3252:Call Drops on TCHH Due to Failures to Return to Normal Call from BSC local switching (Others)

GBFD-117701

1278089500 CELL.CALL.DROPS.LOOP.RESTORE.OTHER.FAIL.TIMES.BTS.LOOP.TCHF M3152a:Call Drops on TCHF Due to Failures to Return to Normal Call from BTS local switching (Others)

GBFD-117702

1278089501 CELL.CALL.DROPS.LOOP.RESTORE.OTHER.FAIL.TIMES.BTS.LOOP.TCHH M3252a:Call Drops on TCHH Due to Failures to Return to Normal Call from BTS local switching (Others)

GBFD-117702

1278089502 CELL.LOCALSWITCH.LOOP.FAIL.SERVICE R3828:Number of local switching Start Failures (Service)

GBFD-117701

GBFD-117702







GSM BSS




8-22


Feature ID

1278089503 CELL.LOCALSWITCH.RESTORE.TRY.BSC.LOOP.SERVICE R3842:Number of Attempts to Return to Normal Call from BSC local switching (Service)

GBFD-117701

1278089504 CELL.LOCALSWITCH.RESTORE.TRY.BTS.LOOP.SERVICE R3843:Number of Attempts to Return to Normal Call from BTS local switching (Service)

GBFD-117702

1278089505 CELL.LOCALSWITCH.LOOP.FAIL.BSC.LOOP.SERVICE R3850c:Number of Failures to Return to Normal Call from BSC local switching (Service)

GBFD-117701

1278089506 CELL.LOCALSWITCH.LOOP.RESTORE.FAIL.BTS.LOOP.SERVICE R3851c:Number of Failures to Return to Normal Call from BTS local switching (Service)

GBFD-117702

1278089507 CELL.CALL.DROPS.LOOP.RESTORE.FAIL.BSC.LOOP.SERVICE M3753:Call Drops due to Failures to Return to Normal Call from BSC local switching (Service)

GBFD-117701

1278089508 CELL.CALL.DROPS.LOOP.RESTORE.FAIL.BTS.LOOP.SERVICE M3853:Call Drops due to Failures to Return to Normal Call from BTS local switching (Service)

GBFD-117702







GSM BSS

BSS Local Switching 9 Glossary



9-1

9 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

Glossary.htm

GSM BSS

BSS Local Switching 10 Reference Documents



10-1

10 Reference Documents

[1] BSC6900 Feature List

[2] BSC6900 Optional Feature Description

[3] BSC6900 GSM Parameter Reference

[4] BSC6900 GSM MML Command Reference

[5] BSC6900 GSM Performance Counter Reference