cdma正常信令及异常信令分析呼叫处理流程及网络优化.ppt

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1、呼叫处理流程及网络优化内容第一部分–呼叫流程第二部分–常规掉话、接入失败及掉话分析。cdma呼叫过程第一部分CDMA呼叫处理AcquisitionoftheCDMASystemIdleModeHandoffRegistrationTerminationOriginationEndofaCallHandoff手机是怎么工作的?ReceiverRFSectionIF,DetectorTransmitterRFSectionVocoderDigitalRakeReceiverTrafficCorrelatorPNxxxWalsh

2、xxSTrafficCorrelatorPNxxxWalshxxTrafficCorrelatorPNxxxWalshxxPilotSearcherPNxxxWalsh0DecoderCPUDuplexerTransmitterDigitalSectionLongCodeGen.OpenLoopTransmitGainAdjustMessagesMessagesAudioAudioPacketsSymbolsSymbolsChipsRFRFAGCAcquisitionoftheCDMASystemCDMA呼叫过程手机找到一

3、个频率Mobilescansforwardlinkfrequencies:(CellularorPCS,dependingonmodel)HistoryListPreferredRoamingListuntilaCDMAsignalisfound.NOCDMA?!GotoAMPS,ortoapower-savingstandbymodeHISTORYLISTLast-used:Freq/SIDxFreq/SIDyFreq/SIDzFreq/SIDtFreq/SIDuetc.FREQUENCYLISTS:PREFERREDR

4、OAMINGLISTFreq/SID1Freq/SID2Freq/SID3Freq/SID4Freq/SID5etc.ForwardLinkFrequencies(BaseStationTransmit)ADBEFCunlic.dataunlic.voiceADBEFC1850MHz.1910MHz.1990MHz.1930MHz.1900MHz.PCSSpectrum824MHz.835845870880894869849846.5825890891.5Paging,ESMR,etc.ABAB800MHz.Cellula

5、rSpectrumReverseLinkFrequencies(MobileTransmit)手机发现最强的导频信号,读取同步信道信息RakeFingersŒŽReferencePNActivePilotEc/Io0032K512ChipsPN1.PilotSearcher扫描全部PNAllPNOffsets0-2098/05/2423:14:09.817[SCH]SyncChannelMessageMSG_LENGTH=208bitsMSG_TYPE=SyncChannelMessageP_REV=3MIN_P_REV=

6、2SID=179NID=0PILOT_PN=168OffsetIndexLC_STATE=0x0348D60E013SYS_TIME=98/05/2423:14:10.160LP_SEC=12LTM_OFF=-300minutesDAYLT=0PRAT=9600bpsRESERVED=12.解码Walsh32,读取同步信息。SYNCCHANNELMESSAGEHandsetRakeReceiverRF»x»LOSrchPN???W0F1PN168W32F2PN168W32F3PN168W32配置信息读完同步信息后，手机开始

7、读寻呼信道消息，并开始不停监测该信道。在通话前，手机必须收集到完整的配置信息。配置信息每1.28seconds会重复。有新的消息手机会更新，如没有600S手机也会更新一次手机到寻呼信道获得配置信息RakeFingersŒŽReferencePNActivePilotEc/Io0032K512ChipsPNAllPNOffsets0-20KeepRakefinger(s)onstrongestavailablePN,decodeWalsh1,andmonitorthePagingChannelReadtheConfigura

8、tionMessagesAccessParametersMsgSystemParametersMsgCDMAChannelListMsgExtendedSystemParametersMsg(*opt.)(Extended*)NeighborListMsgGlobalServiceRedirectio