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
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