GSM系统通信流程详解

1鉴权一般过程

MSBSSMSCVLRHLR/AUCREQUEST(CKSNo,IMSI/TMSI) (与呼叫建立,位置更新,补充业务有关的业务请求)相关MAP消息(CKSNo,IMSI/TMSI)Send parameters(IMSI/TMSI)Authentication parametersAuthentication request(RAND,CKSNn)Authentication response(SRES)Authenticate(RAND,CKSNn)(RAND/SRES/Kc)Authentication response(SRES)相关的MAP消息响应RESPONSE(相关业务请求接受)Authentication reject 合法用户非法用户 成功:合法用户鉴权核对失败:非法用户 合法用户:业务请求接收消息非法用户:业务请求拒绝消息 1

2位置更新操作(一)____位置更新仅涉及本VLR

UmMSLocation updating request(位置更新类型,CKSNo, LAIo,IMSI/TMSI) BSSBSSAPAMSCMAPBVLRCOMPLETE L3 INFORMATION(Layer 3 信息)Authentication request (RAND,CKSNn)Authentication response (SRES)Update location area(CKSN,LAIo,LAIn,IMSI/TMSI)Authentication(RAND,CKSNn)Authentication response(SRES)Set cyphering mode(Kc和算法标识符或不进行编码的指示)Forward new TMSI(TMSI)CYPHER MODE COMMAND (Kc,L3头部消息)CYPHER MODE COMPLETELocation updating accept(TMSIn,LAIn)TMSI reallocation complete CLEAR COMMAND(资源释放)CLEAR COMPLETEUpdate location area ack.(HLR号)TMSI acknowledge (cause,L3头部消息)

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3位置更新操作(二)____位置更新涉及本VLR和HLR(当MS进入新的VLR或MS首次登录,或相关网络数据丢失 后,且MS都使用IMSI来标识自己)

UmMS Locating updating request(IMSI)BSSBSSAPAMSCMAPBVLRMAPDHLR/AUCCOMPLETE L3 INFO.Update location area(IMSI)AuthenticateAuthentication responseSend parameters(IMSI)Authentication parameters(RAND/SRES/Kc,IMSI)Update location Inserte subscriber dataSubscriber data insertion ack. PVLRAuthentication requestAuthentication responseSet cyphering mode CYPHER MODE COMMANDCYPHER MODE COMPLETELocation updating accepteTMSI reallocation completeCLEAR COMMANDCLEAR COMPLETEForward new TMSIUpdate location area ack.Update location ack.(HLR号)cancel locationcancel location ack.先前的VLR从正在拜访本VLR的MS名 单中删除相关的MS数据TMSI acknowledge

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4呼叫接续信号流程____移动用户呼叫移动用户(主被叫MS在同一MSC内)(一)

MSaRACHUm信道请求BSSaAMSCBVLRDHLR内部接口AUCABSSbUmMSbSDCCHCM service requestCOMPLETE L3 INFO(包含CM service req.)(CKSN,IMSI/TMSI)CON_CONFProcess access req.Send parametersAUT_INFO_REQ (SCCP接续确认(包含CM service req.)(IMSI/TMSI) 消息CC)AUT_INFO_PROVAuthentication para. (IMSI,RAND/SRES/Kc)AuthenticateAuthentication request(RAND,CKSNn)(IMSI,RAND/SRES/Kc)(RAND,CKSNn)Authen. res.(SRES)鉴权核对成功Authentication response(SRES)Set cyphering mode启动加密Access req. acceptedCM service accept(IMSI/MSISDN)CIPHER MODE COMMAND(Kc)CIPHER MODE COMPLETE呼叫建立 Setup ( 被叫号码MSISDN)Send info. for o/g call setup(包含service indication,call number)Call proceedingASSIGNMENT REQUESTASSIGNMENT COMPLETEComplete Call(包含所请求的呼叫处理信息)基本业务和补充业务Send routing info. (MSISDN,补充业务信息)Provide roaming number(IMSI) VLR核对IMSI roaming number分配MSRNRouting infomation acknowledgesend info.for i/c call setup为来话发送消息,VLR将核对参数page MS(LAI)寻呼启动PAGINGCOMPLETE L3 INFORMATION (包含Page response)(内部过程)Page response

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5呼叫接续信号流程____移动用户呼叫移动用户(主被叫MS在同一MSC中)(二)

MSaUmBSSaAMSCBVLRDHLR内部接口AUCABSSbUmMSb连接证实 CON_CONF(SCCP接续确认消息CC)Process access req.Send para.(IMSI/TMSI)AUT_INFO_REQAuthenticate(RAND,CKSNn)AUT_INFO_PROV Authen. para.(IMSI,RAND/SRES/Kc)(IMSI,RAND/SRES/Kc)Authentication request(RAND,CKSNn)Authentication(SRES)Authentication response(SRES)Set cyphering modeAccess request acceptedComplete call完成呼叫(回送被叫用户数据)CIPHER MODE COMMAND(Kc)CIPHER MODE COMPLETE呼叫建立Setup呼叫证实Call confirmedASSIGNMENT REQUESTASSIGNMENT COMPLETE提醒 Alerting连接 ConnectAlerting 回铃音 ConnectConnect acknowledge通话网路接续TCH振铃应答连接证实 Connect acknowledge

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