GSM核心网优化

•第一章工作内容•第二章交换机相关参数•第三章GSM各信令流程简介•第四章辅助工具简介•第五章案例分析核心网优化介绍第一章工作内容•主要是优化移动考核的各种KPI指标(系统接通率、寻呼成功率、切换成功率、位置更新成功率、系统各负荷等)•专题优化(恶意呼叫、单通处理、接续时延、节假日话务预测等)•协助移动公司处理一些case第二章交换机相关参数•VLRPARAMETERS(ZMXO;)--------------------------------------------------------------------------------TIMELIMITSLOITERING:001DAYS00HRS.IMPLICITDEREGISTRATION:002HRS.30MIN.CALLWAITING:00MIN.50SEC.INCOMINGCALLCOMPLETIONRESPONSE:04MIN.20SEC.TMSIFREEZINGNOTUSED--------------------------------------------------------------------------------VLRCLEANINGSTARTTIME:04:15TRIPLETS:MIN=2QUINTETS:MIN=2CDRONLOCATIONUPDATE:DISABLED--------------------------------------------------------------------------------PAGEANDSEARCHLIMITFORSIMULTANEOUSSEARCHES:SEARCHESARENOTLIMITEDNUMBEROFSEARCHREPETITIONS:1SEARCHRESPONSEWAITINGTIME:3000MSEC.TMSIPAGEREPETITIONINMTCALL:USEDTMSIPAGEREPETITIONINMTSMS:NOTUSEDTMSIPAGEREPETITIONINMTUSSD:NOTUSEDTMSIPAGEREPETITIONINMTLR:NOTUSED--------------------------------------------------------------------------------•PLMNPARAMETERS(ZMXP:IND=1;)USAGEFREQUENCYCOUNTERS(0=NOTUSED)TMSIALLOCATIONLOCUPNEWVIS:1LOCUP:1PERUP:0IMSIATTACH:1MOCALL:0MOSMS:0MTCALL:0MTSMS:0MTLOCREQ:0MTUSSD:0SSOPER:0AUTHENTICATIONLOCUPNEWVIS:1LOCUP:1PERUP:0IMSIATTACH:1MOCALL:1MOSMS:1MTCALL:0MTSMS:0MTLOCREQ:0MTUSSD:0SSOPER:0IMEICHECKINGLOCUPNEWVIS:1LOCUP:1PERUP:0IMSIATTACH:1MOCALL:1MOSMS:0MTCALL:0MTSMS:0MTLOCREQ:0MTUSSD:0SSOPER:0--------------------------------------------------------------------------------•每次VLR向HLR要鉴权参数组数量MAPPARAMETERHANDLINGCOMMANDOP_ZOPP:2;LOADINGPROGRAMVERSION13.3-0MSCiXFAGS122011-03-3117:43:23DEFAULTMAPPARAMETERSSCCPRETURNOPTION:YESABORTINOVERLOADCONTROL:NONUMBEROFAUTHENTICATIONSETSMAPVERSION14MAPVERSION24COMMANDEXECUTED•增强型寻呼•ZWOS:2,1100;•LOADINGPROGRAMVERSION8.2-0•EXECUTIONSTARTED•PARAMETERCLASS:2SYSTEM_FUNCT_CONFIGUR•IDENTIFIERNAMEOFPARAMETERACTIVATIONSTATUS•01100GET_LAI_BEF_PAGING_REPACTIVATED•COMMANDEXECUTED•寻呼策略ZELO;LANAME:L28804LAC:28804MOBILECOUNTRYCODE...................(MCC)...:460MOBILENETWORKCODE...................(MNC)...:00REPAGINGATTEMPTS.....................(AT)....:002REPAGINGINTERVALTIMER1.............(INT)...:00300(x10msec)MSRNGROUP............................(RNGP)..:000ALLOWEDMNCINNATIONALROAMING.......(MNC)...:-INCLUDEINPOOLCONCEPT...............(INC)...:NODAYLIGHTSAVING.......................(DSAV)..:-TIMEZONE.............................(TZ)....:-VIRTUALMSCADDRESSINDEX.............(VMSC)..:-VIRTUALVLRADDRESSINDEX.............(VVLR)..:-ZMXO;PAGEANDSEARCHLIMITFORSIMULTANEOUSSEARCHES:SEARCHESARENOTLIMITEDNUMBEROFSEARCHREPETITIONS:1SEARCHRESPONSEWAITINGTIME:3000MSEC.TMSIPAGEREPETITIONINMTCALL:USEDTMSIPAGEREPETITIONINMTSMS:NOTUSEDTMSIPAGEREPETITIONINMTUSSD:NOTUSEDTMSIPAGEREPETITIONINMTLR:NOTUSED第三章GSM各信令流程简介•呼叫信令流程•切换信令流程•位置更新信令流程UmABDAUmMSaBSSaMSCVLRHLRAUCBSSbMSb信道请求RACHSDCCHCMservicerequest(CKSN,IMSI/TMSI)COMPLETEL3INFO(包含CMservicereq.)CON_CONF(SCCP接续确认消息CC)Processaccessreq.(包含CMservicereq.)SendparametersAUT_INFO_REQ内部接口AUT_INFO_PROV(IMSI,RAND/SRES/Kc)(IMSI/TMSI)Authenticationpara.(IMSI,RAND/SRES/Kc)Authenticate(RAND,CKSNn)Authenticationrequest(RAND,CKSNn)Authenticationresponse(SRES)Authen.res.(SRES)SetcypheringmodeAccessreq.accepted(IMSI/MSISDN)CMserviceacceptCIPHERMODECOMMAND(Kc)CIPHERMODECOMPLETE呼叫建立Setup(被叫号码MSISDN)Sendinfo.foro/gcallsetup(包含serviceindication,callnumber)CompleteCall(包含所请求的呼叫处理信息)基本业务和补充业务CallproceedingASSIGNMENTREQUESTASSIGNMENTCOMPLETESendroutinginfo.(MSISDN,补充业务信息)Provideroamingnumber(IMSI)roamingnumberRoutinginfomationacknowledgesendinfo.fori/ccallsetuppageMS(LAI)PAGINGPageresponseCOMPLETEL3INFORMATION(包含Pageresponse)(内部过程)鉴权核对成功启动加密为来话发送消息,VLR将核对参数寻呼启动VLR核对IMSI分配MSRN呼叫信令流程(一)UmABDAUmMSaBSSaMSCVLRHLRAUCBSSbMSb内部接口连接证实CON_CONF(SCCP接续确认消息CC)Processaccessreq.Sendpara.(IMSI/TMSI)AUT_INFO_REQAUT_INFO_PROVAuthen.para.(IMSI,RAND/SRES/Kc)(IMSI,RAND/SRES/Kc)Authenticate(RAND,CKSNn)Authenticationrequest(RAND,CKSNn)Authentication(SRES)Authenticationresponse(SRES)SetcypheringmodeAccessrequestacceptedCompletecallCIPHERMODECOMMAND(Kc)CIPHERMODECOMPLETE呼叫建立Setup呼叫证实CallconfirmedASSIGNMENTREQUESTASSIGNMENTCOMPLETE提醒Alerting连接Connect连接证实Connectacknowledge通话Alerting回铃音ConnectConnectacknowledge网路接续TCH振铃应答完成呼叫(回送被叫用户数据)呼叫信令流程(二)呼叫流程-优化指标•呼叫建立成功率•寻呼成功率•接续时延•掉话率~~~~MSMSBSS1MSCaMSCbBSS2VLRb无线传输信号测量HANDOVERREQ.Performhandover(MAP)(全球目标小区表)(全球目标小区标识全球服务小区标识信道类型)HANDOVERREQUEST(PCM&Channeltype)HANDOVERREQUESTACKNOWLEDGE(包含NewTCH和切换参考号)Allocationhandovernumber(分配切换号码)Sendhandoverreport(HON.)(发送切换报告)Radiochannelack.(MAP)(包含NewTCH和HON.)无线信道证实IAMACMHANDOVERCOMMANDHANDOVERCMD经原BSS让MS转到新的信道切换检测HANDOVERDETECT切换完成HANDOVERCOMPLETEBSS2新选TCH连到PCM电路MS进入目标小区发送结束信号Sendendsignal(MAP)CLEARCOMMAND释放PCM0CLEARCOMPLETEANS释放(TUP/ISUP)Endsignal(MAP)结束信号拆去MSCa和MSCb的物理连接Handoverreport释放切换报告移动UmAEBAUm切换信令流程切换流程-优化指标•局内切换成功率•入局切换成功率•出局切换成功率•掉话率MSBSSMSCVLRUmBSSAPMAPABLocationupdatingrequest(位置更新类型,CKSNo,LAIo,IMSI/TMSI)COMPLETEL3INFORMATION(Layer3信息)Updatelocationarea(CKSN,LAIo,LAIn,IMSI/TMSI)Authentication(RAND,CKSNn)Authenticationrequest(RAND,CKSN