edge parametre settings for performance

7/29/2019 EDGE Parametre Settings for Performance

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EDGE Parameter Settings forPerformance

4.7.2005

Version 0.4

Veli-Pekka Ketonen




Content

• 1. Overview

• 2. Performance Impacting Issues (1)• 3. Performance Impacting Issues (2)

• 4. Good parameters and settings

• 5. Potential Error Sources (1)

• 6. Potential Error Sources (2)

• 7. Important Technical Notes and other Documents

• 8. Modem & dial-up setup procedure

• 9. EUTM activation & deactivation




1. Overview

• This document defines the most important factors and parameters

that have been seen to impact to end user performance withNokia BSS.

• This document is not a comprehensive planning or tweaking guidebut rather document that points out the most importa t areas andparameters that should be looked at when targeting at high enduser EDGE data performance.

• Nokia does not guarantee any specific performance figures withthese settings. However, it has been seen that to achievemaximum performance from the system, these instructionsshould help customers.




2. Performance Impacting Issues (1)• 1. BSC parameters

• Important parameters for achieving good data performance, havebeen listed in the next slides.

• Gamma value • Not yet on the separate parameter list, no comprehensive testing done yet.• Gamma defines the steepness of UL power control. I.e. how much power is used in

MS TX when MS is at certain field conditions.• Nokia Default Gamma is 36 dBm at the moment. Nokia default value should likely be

updated closer to 0 to be in line with competition approach and as well to improvepractical field data performance. Current proposal for new default value is 0. Thisimproves UL throughput in field conditions.

• NOTE: Nokia is assessing this change and will possibly issue a new default valuelater.

• 2. Laptop TCP/IP settings• Good settings for most important parameters are defined on the nextslide.

• 3. Phone/device issues• Rel04 supporting phones are necessary for good performance. These

support Extended uplink TBF feature that improves RTT andthroughput performance remarkably.

•

Best performance has been achieved with 7270 phone. 6230i haslikely as well very good performance but has not been tested yetspecifically by BSS R&D.

• 5140 and the same generation phones have older HW that does notgive the same performance as the newer ones. As well: Often 5140phone model settings available in laptop after phone/modeminstallation do not allow maximum speed. See “Modem & dial-upsetup procedure” part in this document.


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3. Performance Impacting Issues (2)• 4. Phone – laptop connection

• IrDA should not be used. Seen to lower RTT by about 50ms in sometests and adds variation.

• Always use cable between phone and laptop. Phone models thatsupport DKU-2 cable, provide best performance.

• 5. Default territory size • Default territory size should be set to 4, in order to provide good

practical system latency for mobiles with 4 TSL capability.Recommendation for good performance is 1 DED + 4 DEF.

• 6. Potential error sources in measurements• Issues seen impacting performance during lab testing are listed in

separate slides in this document. (“Potential Error Sources”)• RF cable between phone and BTS is recommended to be used in tests

if no RF shielded room is available and there is a lot of interference inthe test lab/location due to other testing activity. This requires

anyway a modified phone with connector.• Extended uplink TBF feature is not turned on by default. Withoutactivating EUTM, maximum performance cannot be achieved.



4. Good Parameters and SettingsParameter Parameter

class / idBSS11 & BSS11.5 +

PCD 4

DL_TBF_RELEASE_DELAY 46 / 67 03E8 (1000ms)

UL_TBF_RELEASE_DELAY 46 / 68 01F4 (500ms)

UL_TBF_RELEASE_DELAY_EXT 46 / 71 07D0 (2000ms)

UL_TBF_SCHED_RATE_EXT 46 / 72 4 (80ms) – 2 (40ms)*

DEFAULT TERRITORY SIZE 4

BS_CV_MAX - 9

FC_MS_R_FEF_EGPRR 49 / 22 3A98

FC_MS_B_MAX_DEF_EGPRS 49 / 25 61A8

EGPRS_UPLINK_PENALTY 46 / 47 0001

EGPRS_UPLINK_THRESHOLD 46 / 48 0019

EGPRS_DOWNLINK_PENALTY 46 / 49 0001

EGPRS_DOWNLINK_THRESHOLD 46 / 50 0019

TCP RECEIVE WINDOW SIZE PC TCP/IP 35040 (e.g. 24*MSS (1460B) )MTU PC TCP/IP 1500

Note: Scheduling rate 2 (40ms) gives the best E2E latency (Active RTT), but impacts uplink throughput if there is significant UL TSL sharing present. See Technical Note 816 for details.

PC



5. Potential Error Sources (1)• RF interfence

• Even though RF coaxial cable would be used between phone and BTSin lab conditions, this type of cable has been seen leaking at the

mobile phone end. Phone may pick up interference from air still.• By changing channels and finding good one, situation often improves.• NOTE: This can be an issue especially in unshielded labs where lots of

carriers are used for testing purposes.

• Test servers• According to practical experience, all test servers do not necessarily

provide good performance. Try different servers to isolate possibleissues with individual servers.

• FTP server SW version as well plays a big role as well. Another serverSW degraded throughput by 50%.

• For absolutely maximum performance, test server should be local andclose to test network.

• In download tests, sharing the same file simultaneously should beavoided. This degrades achievable throughput.

• TCP/IP settings• TCP/IP settings affect to performance.• Final impact not quantified today.• TCP/IP Tweaking Guide is available to help optimizing settings.



6. Potential Error Sources (2)• Adjusting power levels

• If throughputs are measured with different RF levels by looking at themobile displayed signal level, BTS TX power attenuation should be set

to 0 dB.• In throughput testing, BTS power should not be adjusted with MMLcommands (PMAX2). This causes in-balance to link budget when RXlevel at MS end is used as reference. UL loss is not affected at all.

• => Step attenuator must be used to set correct attenuation bi-directionally.

• Validity of BSC parameter changes • When changing SW packet “on the fly”, parameters are valid only to

used SW package.• When making an upgrade procedure (Release or CD upgrade),

parameters are copied from previous release to upgraded release.

• TLLI Block coding change• S11.5 and S11 CD5.3-> have a change in TLLI block coding. Initial

MCS is used as well for TLLI blocks. Target of this change is to improvelarge packet RTT in good conditions.• With incorrect/non-optimal parameters, this degrades performance in

low S/N conditions.• See TN 820




7. Important Technical Notes and otherDocuments

Documents are available in NOLS:

• Technical Notes• TN820 Initial MCS parameter value recommendation for EGPRS• TN819 BSSGP Flow control parameter value recommendation for

(E)GPRS• TN816 EUTM and BS_CV_MAX Parameter Value Recommendation for

(E)GPRS

• Other documents

• TCP Throughput Tweaking Guide for EGPRS• BTS EDGE dimensioning• Abis EDGE dimensioning• BSC EDGE dimensioning• Gb EDGE dimensioning




8. Modem & dial-up setup procedure

• 5140, 6020 & 6220• Install modem, connect cable and terminal.

•

“Phone & modem options”– Modems – Add – Next – Checking …

– Change detected modem – Have disk – Browse and select correctmodem driver – OK

– Select installed modem and open Properties

» Change Maximum Port Speed to 230400• Reboot PC• Create dial-up connection

– Speed should be 230400

• 7270• Above procedure didn’t help with 7270 modem• Register editing is needed

• HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class

– Find the correct modem set and edit Properties settings

» 51st – 54th bytes

» Original e.g 08 07 10 0E• Reboot PC• Create dial-up connection

– Speed should be 230400 WinZip File

Register example




9. EUTM activation & deactivation

• Active EUTM• ZWOA:2,899,A;• Wait 10 min• GPRS parameters and System Information update is needed

• ZEQV:BTS=XX:GENA=N/Y;

• Deactivate EUTM• ZWOA:2,899,D;• Wait 10 min• GPRS parameters and System Information update is needed

• ZEQV:BTS=XX:GENA=N/Y;