hsdpa debugging guide

Product name Confidentiality level

WCDMA for internal use only

Product version

RAN: V100R007C01B062

NodeB: V100R007C03B050

Total 14 pages

HSDPA Speed Debugging Guide

Application Reference

Drafted by: Kerl Zhong 76776 Date: 2006-12-22

Reviewed by: Date:

Reviewed by: Date:

Approved by: Date:

Huawei Technologies Co, Ltd

All Rights Reserved

Huawei Confidential. No disclosure without permission.

HSDPA Debugging Guide Confidentiality: for internal use only

2006-10-03 Huawei Confidential. No disclosure without permission. Page 1 of 13

Key Words: HSDPA Abstract: HSDPA can provide 3.6Mbps on each Carrier, this guide introduce the debugging method step by step.

1. Overview

I. HSDPA Overview

HSDPA can reach a max theoretical speed about 14.4Mbps. But in most cases, we give a demo on speed of 3.6Mbps. The HSDPA use HS-PDSCH to bear the forward traffic data, and HS-SCCH to bear the forward signal data. The reverse signal data is undertaken by HS-DPCCH, and the reverse traffic data by DPDCH. The speed of HSDPA may be affected by many causes. The following diagram shows the nodes of the data flow, any bandwidth limitation on this link will cause the speed dropping.

To analyze the HSDPA downlink speed, we should check the link from bottom layer. In case of good wireless environment, the download speed from internal FTP server should be 3.2Mbps, and 2.0Mbps from external website.

II. HSDPA Speed Debugging overview

1. HLR account information; 2. Iu-PS interface PVC bandwidth; 3. Iub-RNC ATM configuration; 4. Iub-NodeB ATM configuration; 5. RNC HSDPA Configuration; 6. NodeB HSDPA Configuration; 7. Test Laptop setting; 8. Advanced Setting;

SGSN RNC NodeB UE

Fiber E1 RF

ATM HSDPA

TCP/IP/PPP



2. Data Configuration

I. HLR

The account must be configured as below:

MAXBRUPL = 128K

MAXBRDWL = 3648K

……..

MAXGBRUPL = 128K

MAXGBRDWL = 3648K

Example:

Refer to attached: HLR account information

II. Iu-PS interface

The bandwidth must be more than 3.6Mbps, you can configure it like this:

ADD ATMTRF: TRFX=103, ST=UBR, TRFD=NOCLPNOSCRCDVT, UT=CELL/S, PCR=283018, REMARK="IU-PS User-Plane";

ADD IPOAPVC: IPADDR="192.168.22.129", PEERIPADDR="192.168.22.130", PEERT=Other, CARRYSRT=WRSS, CARRYSN=2, CARRYPN=15, CARRYVPI=80, CARRYVCI=32, TXTRFX=103, RXTRFX=103;

III. Iub-RNC AAL2PATH

The cell has HSDPA function must be configured with 2 AAL2PATH.

One is R99 type, which supplies traffic bandwidth to voice, data call and reverse link of HSDPA.

Another is HSDPA type, which bandwidth is used for HSDPA forward traffic link.

For example, if the NodeB has an IMA group with 4 E1 links. You can configure 2 ATMTRF with different PCR.

ADD ATMTRF: TRFX=202, ST=RTVBR, TRFD=NOCLPSCRCDVT, UT=KBIT/S, PCR=1120, SCR=1000, REMARK="AAL2PATH-NORMAL";

ADD ATMTRF: TRFX=203, ST=RTVBR, TRFD=NOCLPSCRCDVT, UT=KBIT/S, PCR=5600, SCR=5000, REMARK="AAL2PATH-HSDPA";



ADD AAL2PATH: ANI=5, PATHID=1, ENDSRN=1, ENDSN=15, CARRYSR=LOCAL, ENBAPSF=OFF, CARRYT=IMA, CARRYSN=15, CARRYIMAGRPN=0, CARRYVPI=1, CARRYVCI=50, TXTRFX=202, RXTRFX=202, CONTROLSSN=0, AAL2PATHT=R99;

ADD AAL2PATH: ANI=5, PATHID=2, ENDSRN=1, ENDSN=15, CARRYSR=LOCAL, ENBAPSF=OFF, CARRYT=IMA, CARRYSN=15, CARRYIMAGRPN=0, CARRYVPI=1, CARRYVCI=51, TXTRFX=203, RXTRFX=203, CONTROLSSN=0, AAL2PATHT=HSDPA;

IV. Iub-NodeB AAL2PATH

The NodeB AAL2PATH can be configured same as RNC. But the RCR must be larger than PCR, as the speed is limited by RCR.

Sustain Cell Rate(kbps) = 5000

Peak Cell Rate(kbps) = 5600

Max Burst Size(cell) = 1000

Cell Delay Variation Tolerance(0.1us) = 10240

Receive Cell Rate(kbps) = 5600

V. RNC HSDPA Configuration

• RNC must configure HSDPA Cell and active it.

ADD CELLHSDPA: CellId=30016, AllocCodeMode=Manual;

ACT CELLHSDPA: CellId=30016;

• Then set FMR HSDPA switch on.

SET HSDPATRF: SRN=1, SSN=0, HsdpaTraffic=ON;

• Turn off the UEA1 and turn on the UEA0:

SET UEA: EncryptionAlgo=UEA0-1&UEA1-0;

VI. NodeB HSDPA configuration

For best effect of HSDPA, we can configure the radius of cell. We can configure the cell radius as 2000m by MOD LOCELL.

VII. Test Laptop Setting

We should use good performance laptop, and do some setting on windows system.

We use DRTCP.exe to set the OS TCP Receive window to 65535.



And we must use multi-process download software, such as Flashget or Netant, to download files. The splits can be 10 for one file, or 5 for 2 files.

3. HSDPA Demonstration Skills

All these operation must be guided by Senior Engineer.

For demonstration, we can satisfy some other performance to enhance the HSDPA performance, such as UEA and CELL radius configuration mentioned above.

I. RNC advanced skills:

• SET HSDPCCH: ACKPO1=PO_24/15, NACKPO1=PO_24/15, CQIPO=PO_24/15;

• Set Out-loop Power Control Parameters:

Modify the out loop power control parameters, like BLER/SIR Target value. You need find out the RAB service index of HSDPA service by LST TYPRAB, the Max rate [bit/s] = 3648000. Then we can use MOD TYPRABOLPC command to set the SIR and BLER parameters.

MOD TYPRABOLPC: RabIndex=44, SubflowIndex=0, TrchType=TRCH_HSDSCH, DelayClass=1, InitSirtarget=142, MaxSirtarget=172, MinSirtarget=142;

MOD TYPRABOLPC: RabIndex=45, SubflowIndex=0, TrchType=TRCH_HSDSCH, DelayClass=1, InitSirtarget=142, MaxSirtarget=172, MinSirtarget=142;

MOD TYPRABOLPC: RabIndex=44, SubflowIndex=0, TrchType=TRCH_DCH, DelayClass=1, BLERQuality=-30, InitSirtarget=142, MaxSirtarget=162, MinSirtarget=142;



MOD TYPRABOLPC: RabIndex=45, SubflowIndex=0, TrchType=TRCH_DCH, DelayClass=1, BLERQuality=-30, InitSirtarget=142, MaxSirtarget=162, MinSirtarget=142;

• Increase HS-PDSCH and SCCH Power:

MOD CELLHSDPA: Increase the HS-PDSCH and HS-SCCH power to Max; and decrease the Code Number for HS-SCCH to 1;

MOD CELLHSDPA: CellId=30016, HsScchCodeNum=1, HsdpaPower=430;

• Decrease PCPICH power:

Decrease the power of PCPICH will increase the CQI.

MOD PCPICHPWR: CellId=30016, MaxPCPICHPower=430, MinPCPICHPower=250;

MOD CELL: CellId=30016, PCPICHPower=300;

II. NodeB advanced command:

• Use FIXED power control method

. SET MACHSPARA: LOCELL=30016, SCCHPWRCM=FIXED, SCCHPWR=40;

4. Classic Cases

I. The speed of HSDPA is lower than 384kbps

The most possible reason for this case is the account information in HLR is not correct, which limits the max download speed of the USIM.

II. The speed of HSDPA is lower than 1.5Mbps.

This speed is higher than 384kbps, and must be in HSDPA service.

There are two points need to be identify first.

1. Is the radius of cell less than 4000m?

2. Is the RCR of AAL2PATH in NodeB for HSDPA larger than PCR of RNC?

III. The DL rate of HSDPA is not stable.

When the speed is not stable, you can first check whether the source is stable. We suggest you to install an internal FTP server while doing the demonstration. If the



download source is not stable, you can use QXDM to check the CQI (channel quality Index). The higher is the value, the quality is the better. If CQI is better than 25, the HSDPA download rate should arrive 3.0Mbps. If not, you can work in following steps:

a. Found out the interference source;

b. Use Fixed power control method;

c. Increase the HS-PDSCH and HS-SCCH power;

d. Decrease the PCPICH power to increase CQI.

e. Rotate the mobile to find a good direction for antenna to receive data.

5. Basic Information for HQ investigation.

If at last you still can’t work out the problem of low rate for HSDPA, you may need support from HQ engineer. You need describe the phenomena and give a detailed data report of your test. You can follow this procedure:



I. Start interface tracing of CDT in RNC;

The L2 Data Report Time should be set to 10 sec;

II. Start Traffic DL Throughput of Connection Performance Monitoring in RNC;



III. Start RTWP and TX Carrier Power trace of Cell Performance Monitoring in RNC;

IV. Start of OMStar to collecting the HBBI board information

OMStar is used to collect information from NodeB while HSDPA is on going.

After you install this tool, you need to run the RUN.BAT server program first. If the server works normally, you can read “Serving requests” on bottom of the command dialog.



Input “http://localhost:6080” in IE.

Choose “information collect link to following page:



Use “setting” link to set the NodeB FTP server IP address, username and password.



Use “Configuration Setting” link to set the NodeB O&M IP address, username and password.



Choose the Node of HSDPA Info Collection->Collect HSDPA User Enhancement Performance in Navigate tree on left side of this page.

Press “Start” and input parameter in to the dialog as following:

The slot No is refer to the HBBI board. If the HSDPA work on HBBI in Slot 0, you can input 0 in this blank, otherwise 1.



Press “OK” in this dialog, and then the OMStar begin to work. There is bug for the dialog, as you can’t press OK easily. You must press down the space key to “catch” the OK. You need make a HSDPA call on the HBBI board during the information collection.

The information will be uploaded to FTP server and saved in the “…\\OMStar\logs” folder. The file name is “AutoCollectDlDSPEnhancePerfomanceYYYY-MM-DD_HH-MM-SS.txt”. If this file size is 0, you can package all files in logs folder and send it to HQ.

As this tool is controlled by R&D department, you may request further help from HQ.

hsdpa debugging guide

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