EDGE性能提高参数修改建议.docx

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EDGE性能提高参数修改建议.docx

EDGE性能提高参数修改建议

EDGE性能提高参数修改建议

 

根据集团公司对EDGE的要求,我们希望能够提供更高的EDGE性能,因此希望进行对EDGE参数进行调整,下表为EDGE相关参数

Parameter

Parameter

Class

Default

Value

Recommend

Value

1

bep_period

CELL

0

0(or4)

bep_period2

CELL

15

15(or12)

2

egprs_init_dl_cs

CELL

2(MSC3)

5(MSC6)

egprs_init_ul_cs

CELL

2(MSC3)

7(MSC8or6)

3

gprs_bs_cv_max

CELL

6

15

4

gprs_pc_alpha

CELL

0

5

5

gprs_t3192

CELL

500

500(or1000)

6

max_ms_dl_buffer

CELL

38400

16000(or38400)

7

Tlli_blk_coding

CELL

0

1

8

_cell_data

CELL

70

0(or25or50)

9

n_avg_i

CELL

2

2(or4)

10

delay_dl_rel_dur

BSS

50

50(100)

delay_ul_rel_dur

BSS

18

18(or50)

11

gprs_sched_beta

BSS

1

2

由于不同小区的无线环境及配置情况有差异,因此我们希望能针对不同的小区进行不同参数配置的测试,从而得到优化经验,使局方和我们在以后的优化工作中能更好地设置这些参数。

下面将详细介绍各个参数。

 

一.CELL级别的参数

1.bep_periodandbep_period2

●bep_period

Description

Thebep_periodparameterisusedinanEGPRScelltoindicatetheBEP(BitErrorProbability)filteraveragingperiodusedforfilteringchannelqualitymeasurementsbythemobile.ABSSsoftwareprocessisnotifiedwheneverthebep_periodelementvalueischanged.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheEGPRSfeaturemustbeunrestricted.

Syntax

Changecommandstrings

chg_elementbep_period

chg_cell_elementbep_period

Displaycommandstrings

disp_cell[“full”]

disp_elementbep_period

Values

ValuetypeInteger(BEPfilteraveragingperiod)

Validrange0to10

Defaultvalue0Eliminatesforgettingfactor'e'fromchannelqualitymeasurementalgorithmsexecutedbytheMS.

●bep_period2

Description

Thebep_period2parameterisoptionallyusedinanEGPRScelltofurtherindicatetheBEP(BitErrorProbability)filteraveragingperiodusedforfilteringchannelqualitymeasurementsbythemobile.

Thebep_period2parameterisaforgettingfactorforthemobilestationtousewhenfilteringtheBitErrorProbability.Ifthisparameterissent,themobilestationinthecellusesit,untilthemobilestationinthesamecellreceivesanewbep_period2,orthemobilestationleavesthecellortheMSenterspacketidlemode.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheEGPRSfeaturemustbeunrestricted.

Syntax

Changecommandstrings

chg_elementbep_period2

chg_cell_elementbep_period2

Displaycommandstrings

disp_cell[“full”]

disp_elementbep_period2

Values

ValuetypeInteger(SecondaryBEPfilteraveragingperiod)

Validrange0to15

Defaultvalue15Allowsnormalfiltering

BEP的报告周期,用于控制无线抖动。

下表为BEP相关参数

2.egprs_init_dl_csandegprs_init_ul_cs

●egprs_init_dl_cs

Description

Theegprs_init_dl_csparameterspecifiestheinitialdownlinkcodingschemetobeusedforanEGPRSTBFinacell.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheEGPRSfeaturemustbeunrestricted.

Syntax

Changecommandstrings

chg_elementegprs_init_dl_cs

chg_cell_elementegprs_init_dl_cs

Displaycommandstrings

disp_cell[“full”]

disp_elementegprs_init_dl_cs

Values

ValuetypeInteger

Validrange0to8

0MCS1isappliedtostartondownlinkTBFforthiscell.

1MCS2isappliedtostartondownlinkTBFforthiscell.

2MCS3isappliedtostartondownlinkTBFforthiscell.

3MCS4isappliedtostartondownlinkTBFforthiscell.

4MCS5isappliedtostartondownlinkTBFforthiscell.

5MCS6isappliedtostartondownlinkTBFforthiscell.

6MCS7isappliedtostartondownlinkTBFforthiscell.

7MCS8isappliedtostartondownlinkTBFforthiscell.

8MCS9isappliedtostartondownlinkTBFforthiscell.

Defaultvalue2Thedefaultvalueis2becauseMCS3isconsideredtobesafetostartthedownlinktransferforallmobiles,whenthereisnopriorinformationofamobilesRFchannelquality,regardlessofwheretheyareinthecell.

●egprs_init_ul_cs

Description

Theegprs_init_ul_csparameterspecifiestheinitialuplinkcodingschemetobeusedforanEGPRSTBFinthecell.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheEGPRSfeaturemustbeunrestricted.

Syntax

Changecommandstrings

chg_elementegprs_init_ul_cs

chg_cell_elementegprs_init_ul_cs

Displaycommandstrings

chg_elementegprs_init_ul_cs

chg_cell_elementegprs_init_ul_cs

Values

ValuetypeInteger

Validrange0to8

0MCS1isappliedtostartonuplinkTBFforthiscell.

1MCS2isappliedtostartonuplinkTBFforthiscell.

2MCS3isappliedtostartonuplinkTBFforthiscell.

3MCS4isappliedtostartonuplinkTBFforthiscell.

4MCS5isappliedtostartonuplinkTBFforthiscell.

5MCS6isappliedtostartonuplinkTBFforthiscell.

6MCS7isappliedtostartonuplinkTBFforthiscell.

7MCS8isappliedtostartonuplinkTBFforthiscell.

8MCS9isappliedtostartonuplinkTBFforthiscell.

Defaultvalue2Thedefaultvalueis2becauseMCS3isconsideredtobesafetouseforuplinkdatapacketsaftercontentionresolutionforallmobiles,whenthereisnopriorinformationofamobilesRFchannelquality,regardlessofwheretheyareinthecell.

增大起始编码优点是对于FTP的慢启动改善较明显,但对于小区内无线质量不好的手机可能造成无法使用的后果。

因此可以在无线环境比较好的条件下适当增大起始编码,如CQT测试的小区。

3.gprs_bs_cv_max

Description

Thegprs_bs_cv_maxspecifiesthemaximumcountdownvalueamobilecanuseforuplinkRLCdatatransfer.TheMSsendsacountdownvalueineachuplinkRLCdatablockstartinggprs_bs_cv_maxblocksfromthelastblock.Thevaluesentisdecrementedbyoneineachsubsequentblock.ThisallowsthenetworktoidentifythelastRLCblockintheuplinkTBF.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheGPRSfeaturemustbeunrestricted.

BSSsoftwareprocessesusingthisparameterarenotifiedimmediatelyafterthechangeismade.

Syntax

Changecommandstrings

chg_elementgprs_bs_cv_max

chg_cell_elementgprs_bs_cv_max

Displaycommandstring

disp_elementgprs_bs_cv_max

Values

ValuetypeInteger(blocks)

Validrange0to15

Defaultvalue6

4.gprs_pc_alpha

Description

Thegprs_pc_alphaisthesystemparameterbroadcastontheBCCH.Itisusedasamultiplierofthepoweroffsetinpowercontrolcalculations.Theactualmultiplyingfactorisone-tenthofthevaluesetinthisparameter;thatis,ifNisthevalueofthisparameter,themultiplyingfactorisN/10.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheGPRSfeaturemustbeunrestricted.

BSSsoftwareprocessesusingthisparameterarenotifiedimmediatelyafterthe

changeismade.

Syntax

Changecommandstrings

chg_elementgprs_pc_alpha

chg_cell_elementgprs_pc_alpha

Displaycommandstrings

disp_cell“full”

disp_elementgprs_pc_alpha

Values

ValuetypeInteger(Poweroffsetismultipliedbyonetenthofthisvalue)

Validrange0to10

Defaultvalue0

ALPHA:

该参数设定了在使用手机GPRS动态功率控制时,与路径损耗的对应关系中手机发射功率减少的等级.

优化目的:

可减少上行干扰和减少MS的功耗以保持平均待机时间.

5.gprs_t3192

Description

Thegprs_t3192timerspecifiestheMStimersusedbytheBTSonBCCHblocks.ThisparameterspecifiesthetimethattheMScontinuestheassignedPDCHsafterreceivingitslastdatablockandbeforeitreturnstomonitoringitspaginggroups.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheGPRSfeaturemustbeunrestricted.

Syntax

Changecommandstrings

chg_elementgprs_t3192cell_desc>

chg_cell_elementgprs_t3192

Displaycommandstring

disp_elementgprs_t3192

Values

ValuetypeSelectinteger(milliseconds)

Validrange0,80,120,160,200,500,1000,and1500

Defaultvalue500

Timer3192,默认值为0.5秒,这个参数会影响TBF建立的时间长短。

常规情况下,当一组数据RLC传完之后,手机会启动T3192,再等待0.5秒钟(注意刚才在使用PDTCH时隙),如果没有续传的指令,T3192超时后,会释放掉下行TBF而且开始监视Paging信道。

当再次有数据传时,需要重新立即指配。

这无形中,延长了TBF建立时间。

T3192的改到1秒后对小数据交互多的GPRS业务(如HTTP浏览)或重选等TBF变更频繁的地方(如小区较多的路测地段)的速度上有改善,而对于定点的稳定大数据量的FTP下载没有绝对的正面或负面影响。

6.max_ms_dl_buffer

Description

Themax_ms_dl_bufferparameterspecifiesthemaximumsizeofthedownlinkbufferallocatedtoeveryMSinthecell.

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheGPRSfeaturemustbeunrestricted.

BSSsoftwareprocessesusingthisparameterarenotifiedimmediatelythechange

ismade.

Syntax

Changecommandstrings

chg_elementmax_ms_dl_buffer

chg_cell_elementmax_ms_dl_buffer

Displaycommandstring

disp_elementmax_ms_dl_buffer[]

Values

ValuetypeInteger(bytes.)

Validrange5120to64000

5120bytes

...

...

...

64000bytes

Defaultvalue38400bytes

用于流控,此参数还有待研究。

7.tlli_blk_coding

Description

Thetlli_blk_codingparameterisusedtorequestthemobilestationtousethecodingschemecommandedfortheTemporaryBlockFlow(TBF)evenforRLCblockscontainingthecontentionresolutionTemporaryLogicalLinkIdentifier(TLLI).

TypeA(nooperatoractions)

SupportedbyOMC-RGUIYes

CelldescriptionrequiredYes

DependenciesTheGPRSfeaturemustbeunrestricted.

Syntax

Changecommandstrings

chg_elementtlli_blk_coding

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