HSUPA IC Feature Acceptance Guide

RAN12.0 HSUPA IC Feature Acceptance Guide Security Level: Internal

Product name Confidentiality level

Department: Wireless Product Service Dept

Product versionTotal 23 pages

RAN 12.0 HSUPA IC Feature Acceptance Guide For internal use only

Prepared by Gao Peng 00133535 Date 2010-8-2

Reviewed by Date yyyy-mm-dd

Reviewed by Date yyyy-mm-dd

Granted by Date yyyy-mm-dd

Huawei Technologies Co., Ltd. All rights reserved

2023-04-11 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

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Revision Record

Date Version Description Author

2010-8-2 V1.0 Initial script Gao Peng 00133535


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RAN 12.0 HSUPA IC Feature Acceptance Guide Key word: Interference Cancellation (IC)

Abstract: This document provides a guide for the deployment and acceptance of the IC feature.

Acronyms and Abbreviations

Acronyms and Abbreviations

Full Name

CDMA Code Division Multiple Access

HSUPA High Speed Uplink Packet Access

IC Interference Cancellation

RoT Raise of Thermal

SNR Signal to Noise Ratio

UE User Equipment


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Contents

1 Overview of IC...............................................................................61.1 Overview............................................................................................................................................................6

2 Deployment Preparation................................................................92.1 License...............................................................................................................................................................9

2.1.1 RNC License.............................................................................................................................................9

2.1.2 NodeB License.........................................................................................................................................9

2.2 Requirements of Test Environment and Matched Versions.............................................................................10

2.2.1 Test Environment....................................................................................................................................10

2.2.2 Version Requirement..............................................................................................................................10

3 Parameter Configuration Guide for IC............................................113.1 NodeB Configuration.......................................................................................................................................11

3.1.1 Enabling the IC Feature in Local Cells...................................................................................................11

3.1.2 Setting up the UL DSP of the Cell on the WBBPd Board......................................................................11

3.2 RNC Configuration..........................................................................................................................................12

4 Test Acceptance Guide.................................................................134.1 Verifying Whether the Local Cell Supports the IC Feature.............................................................................13

4.2 Verifying the RNC Configuration and Observing the Signaling.....................................................................13

4.3 Terminal Configuration....................................................................................................................................14

4.4 Verifying Whether a User is an IC user...........................................................................................................14

4.4.1 Check the CDT Message of the NodeB..................................................................................................14

4.5 Acceptance Baseline........................................................................................................................................15

4.6 Acceptance Note..............................................................................................................................................16

5 IC Test Tools.................................................................................175.1 Upload Tools and Upload Optimization..........................................................................................................17

5.1.1 Single-thread Upload..............................................................................................................................17

5.1.2 Multi-thread Upload...............................................................................................................................17

5.2 NodeB CDT Tracing........................................................................................................................................17

5.2.1 Displaying Items to be Traced on the NodeB LMT...............................................................................17

5.2.2 Starting the Tracings of the User CDT, Cell CDT and DSP CDT..........................................................18

5.3 DuMeter...........................................................................................................................................................21


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6 FAQ.............................................................................................226.1 What if the Cell Fails to be Configured on the WBBPd Board?.....................................................................22


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1 Overview of IC

1.1 Overview UMTS adopts the CDMA technology, and therefore the performance of UMTS is subject to the characteristics of the CDMA. The CDMA system is a typical self-interference system. In the case of a single user, the signal to noise ratio (SNR) of the user is limited by the background noise, inter-symbol interference, and external interference (including the interference from neighboring cells). In the case of multiple users, the SNR of each user is affected by the background noise, inter-symbol interference, external interference, and inter-user interference. This means that the larger the number of simultaneous users, the harder it is for users to improve the SNR by increasing the transmit power. In a CDMA system, the system capacity is higher when there are fewer users.

Essentially, the self-interference feature of the CDMA results from the design principles of the CDMA receiver. The CDMA working on the spread spectrum matched filter cannot ensure the spreading codes are completely orthogonal. Therefore, the Multiple Access Interference (MAI) easily happens in the receiver. Because the receiver is not optimal, the MAI happens even in the Gaussian channel model. When the spreading factor (SF) is large, almost the same energy can be received from every user through the inner loop power control. If that happens, the MAI is approximate to Gaussian white noise and has little impact on performance, because the MAI is hidden in the background noise. However, when the SF is small (like 2SF2+2SF4), the energy received from users are raised so high that the MAI cannot be taken as Gaussian white noise and the MAI affects throughput of users greatly. When the subscriber number in the cell is large, and a small SF or multi-channel transmission is used, the uplink receiving performance deteriorates due to the intense impact of the MAI. As a result of the inner power control, the uplink power conflicts with each other. The worst is that the data of all subscribers cannot be correctly demodulated.

Scrambling codes are used to distinguish UEs in the uplink of a UMTS network. Scrambling codes are not orthogonal, and the UMTS uplink is not a synchronous system. Based on the above theories, the interference from other users can be taken as Gaussian white noise (or background noise) when demodulating the user data in the case of a large SF. When the SF is small, this interference cannot be approximate to Gaussian white noise.


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Figure 1-1 The UMTS uplink channels

After the introduction of HSUPA, the interference between users escalates when users can easily use a small SF to transmit data. A new higher-order modulation scheme, 16QAM, is introduced in 3GPP R8. 16 QAM enables the UL throughput to further increase to 11.4 Mbit/s. The UL 16QAM scheme, however, causes serious multiple access interference. A UE using UL 16QAM may consume all the UL resources over the Uu interface in the cell. As a result, other UEs cannot access the network.

Even when the QPSK modulation scheme and HSUPA 2 ms TTI data transmission are used, the access of a high-rate user, for example a user whose RLC-layer data rate is greater than 3.5 Mbit/s, may cause congestion in the cell.

The UL of the UMTS FDD network is a typical interference restricted system. Similar to the DL of the UMTS network, the UL of the TD-SCDMA is an orthogonal system. Thus, the UL interference is not the main factor that affects the system capacity. Therefore, in the UL of the UMTS FDD network, decreasing the interference between users can significantly increase the UL data rate and the UL network capacity.

An ideal receiver adopts the multi-user detection (MUD) technology to suppress multiple access interference. According the analysis of industrial experts, it is highly complex to apply the MUD technology. Therefore, this technology cannot be used in commercial networks in a short time.

For ease of implementation, the IC technology is widely applied. The basic principle of IC is as follows: First, the user signals are demodulated to obtain the data structure, including the user scrambling codes, DPCCH data, EDPCCH data, and EDPDCH data. Then, the obtained signals are combined with the original user signals to generate new baseband data. Finally, the baseband data is demodulated. This is shown in Figure 1-2.


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Figure 1-2 The basic principles of IC


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2 Deployment Preparation

2.1 License

2.1.1 RNC LicenseNone.

2.1.2 NodeB LicenseThe NodeB license ensures the IC license can be opened and is valid. The NodeB license is managed on the M2000.

As shown in Figure 2-1 Number of local cells supporting IC=Unlimited indicates that the NodeB supports unlimited number of IC cells.

Figure 2-1


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2.2 Requirements of Test Environment and Matched Versions

2.2.1 Test EnvironmentServing GPRS Support Node (SGSN): not involved

Gateway GPRS Support Node (GGSN): not involved

Home Location Register (HLR): not involved

SIM cards registration: not involved

Radio Network Controller (RNC): not involved

NodeB: The 3900 series configured with the WBBPd board

DBS3800 configured with the EBBCd board

BTS3812/BTS3812AE configured with the EULPd board

Remote Radio Unit (RRU): 40w and above

2.2.2 Version RequirementNodeB: RAN12.0 and later versions

Others: not involved


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3 Parameter Configuration Guide

for IC

3.1 NodeB Configuration

3.1.1 Enabling the IC Feature in Local Cells1. To enable the IC feature by modifying the parameters of local cells that already exists,

run the DEA UCELL command to deactivate the cell on the RNC. Then, enter the following MML command on the NodeB LMT: MOD LOCELL: LOCELL=0, SECT=REMOTE-SECTOR, IC-MODE=TRUE. After running the above command, reactivate the cell on the RNC.

2. To add a new local cell enabled with the IC feature, run the following MML command: ADD LOCELL: LOCELL=0, STN=0, SECN=0, SECT=REMOTE_SECTOR, SRN1=60, ULFREQ=9612, DLFREQ=10562, MXPWR=430, HISPM=FALSE, RMTCM=FALSE, IC_MODE=TRUE.


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3.1.2 Setting up the UL DSP of the Cell on the WBBPd Board

Different types of BTSs require different boards to support the IC feature. The details are as follows:

The BTS3812E/BTS3812AE must be configured with the EULPd board.

The DBS3800 must be configured with the EBBCd board.

The 3900 series must be configured with the WBBPd board.

The following takes the V2 platform of the 3900 series as an example to describe how to configure a local cell on the WBBPd board.

Set up an independent uplink resource group on the WBBPd board. If the slot number where the WBBPd is located is slot 2, the detailed commands are as follows:

1. ADD ULGROUP: ULGROUPN=1, DEMMODE=DEM_2_CHAN, SNE1=2. Note that SNE1 is the number of the slot holding the WBBPd board.

After that, check separately the WBBPb board and the WBBPd board on two uplink resource groups. That is, the WBBPb board is on the No. 0 uplink resource group and the WBBPd board is on the No.1 uplink resource group, as shown in Figure 3-1.

Figure 3-1

2. Run the following command to configure the local cell in the UL group No.1 on the WBBPd board:

ADD LOCELL: LOCELL=0, STN=0, SECN=0, SECT=REMOTE_SECTOR, ULGROUPNO=1, SRN1=60, ULFREQ=9870, DLFREQ=10820, MXPWR=430, HISPM=FALSE, RMTCM=FALSE, IC_MODE=TRUE.


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3.2 RNC ConfigurationNot involved.


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4 Test Acceptance Guide

4.1 Verifying Whether the Local Cell Supports the IC Feature

Run the DSP LOCELL command to verify whether the local cell supports the IC feature. IC MODE=Enabled indicates that the local cell supports IC, as shown in Figure 4-1.

Figure 4-1

4.2 Verifying the RNC Configuration and Observing the Signaling

Not involved.


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4.3 Terminal Configuration Not involved.

4.4 Verifying Whether a User is an IC user

4.4.1 Check the CDT Message of the NodeB 1. Check the value of bIcUserFlag in the (UL) RLSetupDemodInfo (period: 120 ms)

message.

bIcUserFlag: 0x1(1) indicates that the user is an IC user, as shown in Figure 4-1.

bIcUserFlag: 0x0(0) indicates that the user is a non-IC user, as shown in Figure 4-2.

Figure 4-1

Figure 4-2


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2. Check the value of bit1IcUsrind in the DL Hsupa Rlenhance Info Statistic.

bit1IcUsrind:0x1 (1) indicates that the user is an IC user, as shown in Figure 4-1.

bit1IcUsrind:0x0 (0) indicates that the user is a non-IC user, as shown in Figure 4-2.

Figure 4-1

Figure 4-2

4.5 Acceptance Baseline In good radio propagation environment, the HSDPA uplink rate can increase at least 10% after the IC feature is enabled.


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4.6 Acceptance NoteBefore modifying the IC configuration of a cell, first deactivate the cell on the RNC, and then modify the IC configuration of the cell on the NodeB. After the modification, reactivate the cell on the RNC. In addition, dial up on the UE to reconnect the network.

The IC gain is associated with the entire cell. It is recommended that two to four UEs be used in the acceptance procedure.


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5 IC Test Tools

5.1 Upload Tools and Upload Optimization

5.1.1 Single-thread Upload DOS and FileZilla are two main single-thread upload tools.

1. To upload the file through FTP.

Click Start > Run to enter cmd in the command prompt window to open the DOS window, and log in to the FTP server through the FTP command.

Enter the FTP username and login password.

Use the put command to upload the file to the FTP server.

2. FileZilla single-thread upload: To upload one file at one time using FileZilla.

5.1.2 Multi-thread UploadFileZilla is the main multi-thread upload tool. Multi-thread upload is to upload two or more files at one time.

To prevent the case of data resource insufficiency in the testing process, it is recommended that no more than three files be uploaded at one time.

5.2 NodeB CDT Tracing

5.2.1 Displaying Items to be Traced on the NodeB LMT

1. Retrieve the TraceTask.ini file in the file path:

D:\HW LMT\adaptor\clientadaptor\NodeB\***\style\defaultstyle\conf\trace.

”***” indicates the version number of the NodeB. Click the properties tab for modification, including the user tracing, cell tracing and the DSP (Digital Signal Processor) tracing.


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2. Change the check marks of the tracing items to 1. The values of the check marks can be 0, 1 or 2.0 indicates that this item is displayed on the LMT, but is not selected by default; 1 indicates that this item is displayed on the LMT and is selected by default;

− 2 indicates that this item is not displayed on the LMT.

5.2.2 Starting the Tracings of the User CDT, Cell CDT and DSP CDT

1. Starting the User CDT (Call Detail Trace).

1) Tracing according to the connection time.

Double-click User Tracing to start the user tracing and set Trace Method to Chain Time. Set User Number, and set Begin Time and End Time. For example, if the current time is 16:14, February 20, 2010, Begin Time and End Time can be set to 16:14 February19, 2010 and 16:14, February 21 separately, as shown in Figure 5-1. After that, select the items for tracing and click OK, as shown in Figure 5-2.

Figure 5-1 Upload tools and upload optimization


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Figure 5-2

2) Tracing according to the IMIS number.

Double-click User Tracing to start the user tracing and set IMIS to Trace Method. Set IMIS ID and click OK.

Items to be selected on the User CDT in the IC testing process are as follows:

(DL)Hsupa Rlenhance Info Statistic

(DL)Hsupa Rl Sche Result Statistic (period: 2ms)

(DL)Hsupa Rl Interface Statistic (period: s)

(UL)R6SetupDecodInfo (period: 160ms)

(UL)RLSetupDemodInfo (period: 120ms)

2. Starting the Cell CDT


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Double-click Cell Tracing to start the cell tracing, set Cell ID, set Trace Type to Cell, and click OK, as shown in Figure 5-1.

Figure 5-1

Item to be selected on the Cell CDT in the IC testing process is as follows:

(DL)Hsupa Cell Load Info Statistic

3. Starting the DSP CDT

Double-click DSP Tracing to start the DSP tracing, set Slot No. to the slot No. where the WBBPd board is located, set DSP ID to the uplink DSP ID No., and click OK.

Figure 5-1

Item to be traced on the DSP CDT in the IC testing process is as follows:

(UL) Dsp Resource IC Para Query (period: 200ms)


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5.3 DuMeter First, detect and measure the RX/TX packages on the ports in real time. Then, measure the uplink/downlink RX/TX packages on the UE port side, trace the rate in real time, and measure the Application-Layer Throughput (the head of TCP/IP included).

Set Network interface to monitor to the default value, Dial-Up Connections Only, in the IC testing process.


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6 FAQ

6.1 What if the Cell Fails to be Configured on the WBBPd Board?

When the BBU assigns the WBBPb board and the WBBPd board to the same UL resource group, the cell will not definitely be established on the WBBPd board. The BBU can be redirected to the main control board through the Dbg debug console port or the Telnet. Then, run the following command to block the DSP resource on the WBBPb board and configure the cell on the WBBPd board forcibly:

BdcfSetModuleBlock (1, 0, 1)



You can redirect the BBU to the WBBPb board through the Dbg debug console port and view the block situation of the DSP on the WBBPb board. As shown in Figure 6-1, the DSP on the WBBPb board is blocked.

Figure 6-1

You are recommended to configure the UL resource group separately, because only three local cells can be established on one NodeB once the resource is blocked. Besides, the WBBPb board will be automatically unblocked once the NodeB is restarted.


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Documents

HSUPA IC Feature Acceptance Guide