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第一部分CDMASystemOptimizationOptimizationNeighborListPilotpollutionCoverageholesSearchwindowsizeAccessfailuresPilotsurpriseCDMASystemParameters手机和系统之间的主要信令:1.PSMM:PilotStrengthMeasurementMessage(反向)2.EHDM:ExtendedHandoffDestinationMessage(前向)3.HCM:HandoffCompleteMessage(反向)4.NLUM:NeighborListUpdateMessage(前向)5.PMRM:PowerMeasurementReportMessage(反向)6.ITSPM:In-trafficSystemParameterMessage(前向)SettingParametersTherearetwolevelsatwhichparametersareset:1、Atthecarrier-sectorlevel(local参数)2、AttheCBSClevel(global参数)HandoffParametersHandoffMode:1.CBSC:Taddmode、TCompmode2.Sector:NeighborLists、DAHOIndicator、Tadd、Tdrop、TTdrop、TcompMobileSearchWindows:1.CBSC:AddIntercept、DropIntercept2.Sector:SrchWinA、SrchWinN、SrchWinRSrchWinAActiveandCandidatesetsearchwindowsizeThissizeismadelargeenoughtoincorporate95%ofexpecteddelayspreadenergySmallwindowsizemayleadtonotdetectingusefulmultipathenergyCommonstartingvalue:28chips1km=4.1PNchips1Km光纤=1.7km(空间)=7PNchips例:手机在离A站(PN=10)1km和离B站(PN=20)3km的地方同时和两个基站通话010640644.1(实际)32767chips511PN1284.11280200511PN32767chips1292.3(实际)SrchWinA=281270.11298.1手机以最强PN为参考,本例中手机认为644.1就是640,并以此作参考点,认为1284.1就是1280,也以此作为搜索窗的中心点。SrchWinA则取A、B两站中最大的A站B站CellSizeParametersCBSC:PilotIncSector:1、SifPilotPwr(机顶发射pilot的功率)2、Cellradius(决定PamSz和AchPamWinSz,并决定基站的半径)3、TchAcqWinSz(Thisparameterisusedbythetargetsectortrafficchannelwhenacquiringthemobileonahandoffadd.Itmustbeaslargeas“AchWinSz”)ForwardPowerControl见图-1StateDiagramofForwardPowerContral见图-2SMAPSystemMonitoringApplicationProcessor该工具直接从FEP中取得反向信道的消息(FER&IS-95messaging)可以同时跟踪10部手机或者跟踪某个扇区的所有Call.CDL(CallDetailLogs)GeneratedbytheMMattheendofacallLoggedattheOMC-RSendtotheOMC-RinabinaryformatwithinCDLeventfilesCDLAnalysisTool(可以统计:Top20;Distribution;Pareto)CDL部分参数分析ACCESS_PN_OFFSET(手机和基站的码片偏差)ENTRY_TYPE(呼叫类型:0-主叫;1-被叫)SERVICE_OPTION(服务类别:话音、数据等)NEGOTIATED_SO(最终确定的服务类别)LAST_MM_SETUP_SO(18-23都是属于正常范围,如果有问题,也与基站无关)第二部分CallProcessing1.CallProcessing(Callsetup、SoftHandoff、Powercontrol)2.SomeParametersJ-STD-8VS.IS95AJ-STD-8:Rateset2(13KCelp编码)有4种速率:14.4k7.2k3.6k1.8kIS95A:Rateset1(8KCelp编码)有4种速率:9.6k4.8k2.4k1.2kJ-STD-8比IS95质量好,但是功率大、容量小8KEVRC(EnhancedVariableRateCodec)MobileStationCallProcessingStatesPowerUpInitializationStateIdleStateSystemAccessstateControlontheTrafficChannelMobileStationInitializationStateSystemDeterminationSubstatePilotChannelAcquisitionSubstateSyncChannelAcquisitionSubstate(最强导频的同步信息)ThinkingChangeSubstate(长码同步)MobileStationIdleStateIdleProceduresResponsetoOverheadInformationOperationMSPageMatchOperationMSOrderandMessageProcessingOperationMSOriginationOperationMSMessageTransmissionOperationMSPower-DownOperationAcknowledgementProceduresforPagingChannelMessageBSMS(PagingChannel)Ack_REQ:(是否需要确认)MSG_SEG:(消息序号)ADDR_TYPE:(号码类型)MSBS(AccessChannel)VALID_ACK:(是否确认)ACK_SEQ:(对几号消息的确认)ACK_TYPE:(确认类型)AcknowledgementProceduresforAccessChannelMessagesMSBS(AccessChannel)ACK_REQ:AllAccesschannelmessagerequireacknowledgmentMSG_SEQBSMSVALID_ACKACK_SEQPagingChannelMessagesSystemParametersMessageAccessParametersMessageNeighborListMessageCDMAChannelListMessageOrderMessage(系统to手机)ChannelAssignmentMessage(分配WalshCode)PagingChannelMessages(continue)DataBurstMessageAuthenticationChallengeMessageSSDUpdateMessageExtendedSystemParametersMessageGlobalServiceRedirectionMessageNullMessageSystemParametersMessage8种登记方式:1.区域登记(SID、NID、REG_ZONE)2.开机登记3.关机登记4.周期性登记5.距离登记6.参数变化登记7.指令登记8.隐含登记SystemParametersMessage(continue)1、REG_ZONE(登记区)1、TOTAL_ZONE(登记表大小)1、ZONE_TIMER(超时删除登记区)1、HOME_REG(归属登记区)2、POWER_UP_REG3、POWER_DOWN_REG4、REG_PRDSystemParametersMessage(continue)5、BASE_LAT5、BASE_LONG5、REG_DIST6、PARAMETER_REG其它:SRCH_WIN_A、SRCH_WIN_N、SRCH_WIN_RNGHBR_MAX_AGE(PN在Nei中的时间)SystemAccessStateAccessAttemptsNOW_PWR、INIT_PWRPAM_SZ、AchPamWinSz(这两个参数不用设置,而是由小区半径CellRadius决定)AccessAttemptsPower:1、IP=-73-MeanInputPower(dBm)+NOM_PWR+INIT_PWR2、NOM_PWR:Nominaltransmitpowerupoffset(前、反向信道衰耗差的校准值)3、INIT_PWR:Initialpoweroffsetforaccess(开始接入电平补偿)4、PWR_STEP:Powerincrement(PI)AccessAttempts(continue)Timing1.TA=(2+ACC_TMO)*80ms(基站确认时长)1.RT:Randomnumberofslotsbetween0and(PROBE_BKOFF+1)(PROBE_BKOFFassumesvaluesof0to15)AccessAttemptAccessAttempt(continue)MSControlontheTrafficChannelState业务信道中传控制信令用于功控和切换1.Blank&Burst(用1帧传信令,8.6K、172bit)话音帧结构:MM:有无被信令抢占(1-有;0-无)TT:主/次要业务(1-短信息;0-信令抢占)TM:11(全部信令)MMTTTM信令(168bit)MSControlontheTrafficChannelState(continue)2、Dim&Burst话音帧结构:3种TM:00(信令抢占的比例约为一半;½:88位信令,80话音)01(1/4:40话音,128信令)10(1/8:16话音,152信令)MMTTTM话音信令ForwardTrafficChannelMessagesAuthenticationChallengeMessage(强制鉴权请求)ExtendedHandoffDirectionMessage(切换指示)DataBurstMessage切换完成后,系统给手机发的3条信息:1.In-TrafficSystemParametersMessage2.NeighborListUpdateMessage3.PowerControlParametersMessageReverseTrafficChannelMessagePSMM:PilotStrengthMeasurementMessage(用于切换:满足切换时发送)PMRM:PowerMeasurementReportMessage(用于前向功控:前向信道误帧情况的测量报告)HandoffCompletionMessageForwardPowerControl(FPC)Overview目标:在保证通话质量的前提下,尽量减少干扰FPC由基站根据手机报告的错帧信息(PMRM)来完成前向功控速度较慢,只能克服阴影衰落(慢衰落)
本文标题:CDMA 高级培训
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