CDMA关键参数及切换算法介绍课件.ppt

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1、CDMA关键参数及切换算法介绍2-1CDMA网优技术和实际案例学习培训ContentsofthisLectureAcquiretheSystemIdleModeHandoffAccessHandoffTrafficHandoffPracticalConsideration2AcquiretheSystemCDMAHandoff:PartI2-3CDMA网优技术和实际案例学习培训FAQ:What’shappenedafterwetureonthehandsetForwardLinkFrequencies(BaseStationTr

2、ansmit)ADBEFCunlic.dataunlic.voiceADBEFC1850MHz.1910MHz.1990MHz.1930MHz.1900MHz.PCSSpectrum824MHz.835845870880894869849846.5825890891.5Paging,ESMR,etc.ABAB800MHz.CellularSpectrumReverseLinkFrequencies(MobileTransmit)Mobilescansforwardlinkfrequencies:(CellularorPCS,de

3、pendingonmodel)HistoryListPreferredRoamingListuntilaCDMAsignalisfound.NOCDMA?!GotoAMPS,ortoapower-savingstandbymodeHISTORYLISTLast-used:Freq/SIDxFreq/SIDyFreq/SIDzFreq/SIDtFreq/SIDuetc.FREQUENCYLISTS:PREFERREDROAMINGLISTFreq/SID1Freq/SID2Freq/SID3Freq/SID4Freq/SID5et

4、c.FindaFrequencywithaCDMARFSignalRakeFingersŒ?ReferencePNActivePilotEc/Io0032K512ChipsPN1.PilotSearcherScanstheEntireRangeofPNsAllPNOffsetsExhaustiveResearch0-2098/05/2423:14:09.817[SCH]SyncChannelMessageMSG_LENGTH=208bitsMSG_TYPE=SyncChannelMessageP_REV=3MIN_P_REV=2

5、SID=179NID=0PILOT_PN=168OffsetIndexLC_STATE=0x0348D60E013SYS_TIME=98/05/2423:14:10.160LP_SEC=12LTM_OFF=-300minutesDAYLT=0PRAT=9600bpsRESERVED=12.PutRakefinger(s)onstrongestavailablePN,decodeWalsh32,andreadSyncChannelMessageSYNCCHANNELMESSAGEHandsetRakeReceiverRF»x»LO

6、SrchPN???W0F1PN168W32F2PN168W32F3PN168W32FindStrongestPilot,ReadSyncChannelRakeFingersŒ?ReferencePNActivePilotEc/Io0032K512ChipsPNAllPNOffsets0-20KeepRakefinger(s)onstrongestavailablePN,decodeWalsh1,andmonitorthePagingChannelReadtheConfigurationMessagesAccessParamete

7、rsMsgSystemParametersMsgCDMAChannelListMsgExtendedSystemParametersMsg(*opt.)(Extended*)NeighborListMsgGlobalServiceRedirectionMsg(*opt.)HandsetRakeReceiverRF»x»LOSrchPN???W0F1PN168W01F2PN168W01F3PN168W01GotoPagingChannel&GetConfigured98/05/2423:14:10.427[PCH]MSG_LEN

8、GTH=184bitsMSG_TYPE=AccessParametersMessagePILOT_PN=168OffsetIndexACC_MSG_SEQ=27ACC_CHAN=1channelNOM_PWR=0dBINIT_PWR=0dBPWR_STEP=4D