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M900/M1800基站子系统信令分析手册目录i目录第7章移动主叫流程.............................................................................................................7-17.1概述...................................................................................................................................7-17.2正常流程............................................................................................................................7-17.2.1MobileoriginatingcallestablishmentwithoutOACSU(earlyassignment).............7-27.2.2MobileoriginatingcallestablishmentwithOACSU(lateassignment)....................7-57.2.3MobileoriginatingcallestablishmentwithOACSU(Veryearlyassignment)..........7-77.3异常流程............................................................................................................................7-87.3.1随即接入、立即指配异常流程.................................................................................7-87.3.2MSC未下发Assignmentrequest而是直接下发Disconnect拆除呼叫..................7-97.3.3指配异常流程..........................................................................................................7-97.3.4掉话造成的异常流程.............................................................................................7-107.3.5用户挂机造成的异常流程......................................................................................7-107.3.6MSC清除造成的异常流程.....................................................................................7-11M900/M1800基站子系统信令分析手册第7章移动主叫流程7-1第7章移动主叫流程7.1概述移动主叫(始呼)包括MS拨打MS、MS拨打固定电话,不包括短消息始发。7.2正常流程移动主叫正常流程,根据指配流程类别(EarlyAssignment、LateAssignment、VeryEarlyAssignment)分成三类。其中EarlyAssignment、LateAssignment流程的选择是MSC决定的;VeryEarlyAssignment流程是由BSS根据无线资源等情况决定的。M900/M1800基站子系统信令分析手册第7章移动主叫流程7-27.2.1MobileoriginatingcallestablishmentwithoutOACSU(earlyassignment)1.信令流程ChannelACTChannelACTACKIMMASSCMDBTSBSCMSCMSChannelREQSABMESTIND(CMServiceREQ)CR(CMPL3information)CCSetupCallProceedingASSREQASSCMDSABMESTINDASSCMPASSCMPAlertingConnectConnectACKTalkingDISCRELRELCMPClearCMDClearCMPCMServiceAcceptedChannelACTChannelACTACKUAUAChannelRELRELINDDeactiveSACCHRFChannelRELRFChannelRELACKDISCUARLSDRLSDCMP(1)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(26)ChannelRQD(2)图7-1MobileoriginatingcallestablishmentwithoutOACSU(earlyassignment)M900/M1800基站子系统信令分析手册第7章移动主叫流程7-3(1)MS在空中接口的接入信道上(RACH上)向BTS发送ChannelRequest(该消息内含接入原因值为MOC。但是该消息中的原因值并不完全准确,因为MS在做移动主叫和IMSI分离时都填的是该原因值。);(2)BTS向BSC发送ChannelRequired消息;(3)BSC收到ChannelRequired后,分配信令信道,向BTS发送ChannelActivation;(4)BTS收到ChannelActivation后,如果信道类型正确,则在指定信道上开功率放大器,上行开始接收信息,并向BSC发送ChannelActivationAcknowledge;(5)BSC通过BTS向MS发送ImmediateAssignmentCommand,Um接口中该消息在AGCH上发送;(6)MS在SDCCH上发SABM帧接入;(7)BTS在SDCCH上回UA帧进行确认;(8)BTS向BSC发EstablishmentIndication(该消息中准确的反映了MS的接入原因,例如此时对移动主叫和IMSI分离填的是不同的原因值。),内含CMServiceRequest消息内容;(9)BSC建立A接口SCCP链接,向MSC发送CMServiceRequest;(10)MSC向BSC回链接确认消息;(11)MSC发CMServiceAccepted,Um接口中该消息在SDCCH上发送;(12)主叫MS在SDCCH上发Setup;(13)MSC向主叫MS发CallProceeding,Um接口中该消息在SDCCH上发送;(14)MSC向BSC发AssignmentRequest,在该消息中,分配了A接口CIC;(15)BSC分配话音信道,向BTS发送ChannelActivation;(16)BTS收到ChannelActivation后,如果信道类型正确,则在指定信道上开功率放大器,上行开始接收信息,并向BSC发送ChannelActivationAcknowledge;(17)BSC通过BTS向MS发送AssignmentCommand,Um接口中该消息在SDCCH上发送;(18)MS在AssignmentCommand中指定的FACCH上发SABM帧来接入;(19)BTS在FACCH上回UA帧进行确认;(20)BTS向BSC发EstablishmentIndication;(21)MS在接入话音信道后,在FACCH上发送AssignmentComplete;M900/M1800基站子系统信令分析手册第7章移动主叫流程7-4(22)无线业务信道和地面电路均成功连接后,BSC向MSC发送AssignmentComplete,并认为该呼叫进入通话状态;(23)MSC向主叫MS发Alerting消息,主叫MS听到回铃音,Um接口中该消息在FACCH上发送;(24)MSC向主叫MS发Connect,Um接口中该消息在FACCH上发送;(25)主叫MS在FACCH上向MSC回ConnectAcknowledge;(26)主叫MS和被叫MS进入语音通话状态;(27)通话完毕,主叫MS挂机,主叫MS在FACCH上发Disconnect消息;(28)MSC向MS发Release,Um接口中该消息在FACCH上发送;(29)MS回ReleaseComplete,Um接口中该消息在FACCH上发送;(30)MSC向BSC发ClearCommand,BSC收到该消息后,启动释放流程;后续的释放流程参见释放流程的描述;(31)BSC通过BTS向MS发送ChannelRelease,Um接口中该消息在FACCH上发送;(32)MS在FACCH上发DISC帧;(33)BTS在FACCH上回UA帧进行确认。2.流程说明(1)图7-1中(1)~(8)为随机接入、立即指配过程。在此过程中,BSS为MS分配信令信道。(2)图7-1中,在(10)和(11)之间,可能会有鉴权、加密流程、类标查询(更新过程)。根据MSC的数据配置情况等的不同,在A接口链接建立后,MSC有可能不会立即下发CMServiceAccepted消息,而是:(a)下发CipherModeCommand启动加密流程(这种情况下MSC就不会再下发CMServiceAccepted消息);(b)下发AuthenticationRequest启动鉴权流程;(c)下发ClassmarkUpdate启动类标更新流程。此外,如果BSC数据配置中“ECSC”配置为“是”,则双频MS在上报EstablishmentIndication后,将紧接着上报ClassmarkChange消息。(3)图7-1中(14)~(22)为TCH指配流程在此流程中,BSS为MS分配话音信道以及A接口电路等资源。(4)图7-1中(30)~(40)为释放流程M900/M1800基站子系统信令分析手册第7章移动主叫流程7-5图7-1所示为主叫MS先挂机的释放流程。在资源释放时,无线口先释放逻辑信道,再释放物理信道。7.2.2MobileoriginatingcallestablishmentwithOACSU(lateassignment)1.信令流程ChannelACTChannelACTACKIMMASSCMDBTSBSCMSCMSChannelRQDSABMESTIND(CMServiceREQ)CR(CMPL3information)CCSetupCallProceedingASSREQASSCMDSABM(18)ESTINDASSCMPASSCMPAlertingConnectConnectACKTalking(25)DISCRELRELCMPClearCMDClearCMPCMServiceAcceptedChannelACT(15)ChannelACTACK(16)UAUAChannelRELRELINDDeactiveSACCHRFChannelRELRFChannelRELACKDISCUARLSDRLSDCMP(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(17)(19)(20)(21)(22)(23)(24)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)
本文标题:07-移动主叫流程6015752809
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