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1、目的和內(nèi)容目的和內(nèi)容t目的p介紹GSM正常的呼叫流程(空中接口、A-bis接口和A接口)p介紹部分常見的異常中斷的流程t內(nèi)容pGSM網(wǎng)絡協(xié)議介紹pGSM邏輯信道介紹p無線鏈路建立流程(Radio and Link Establishment Procedure)pTCH正常分配流程(Normal Assignment Procedure) p主叫流程(Originating Call)p被叫流程(Terminating Call)p位置更新流程(Location Updating)p切換流程(Handover Procedure)p呼叫釋放流程(Call Release Procedure)p

2、信道釋放流程(Channel Release Procedure)GSMGSM協(xié)議協(xié)議層數(shù)層數(shù)無線網(wǎng)絡優(yōu)化主要關心第三層的無線網(wǎng)絡優(yōu)化主要關心第三層的信令信令無線網(wǎng)絡優(yōu)化主要關心無線網(wǎng)絡優(yōu)化主要關心DTAPDTAP、RSLRSL的信令的信令無線網(wǎng)絡優(yōu)化主要關心無線網(wǎng)絡優(yōu)化主要關心DTAPDTAP、BSSMAPBSSMAP和部分和部分SCCPSCCP的信令的信令DTAPRSLOMLGSM網(wǎng)絡協(xié)議網(wǎng)絡協(xié)議tLayer 3介紹pRR : 無線資源管理(Radio Resource Management)由MS、BTS和BSC控制功能舉例 Paging管理(Paging Management) 加密管

3、理(Ciphered Mode Management) 頻點分配(Frequency Redefinition) 信道分配(Dedicated Channel Assignment) 切換(Handover Management ) 測量和功率控制(Measures and Power Control)pMM : 移動性管理(Mobility Management)由MS和MSC / VLR控制功能舉例 鑒權和身份識別(Authentication / Identification Procedures) 位置更新(Location Updating) IMSI Attach / Detach

4、GSM網(wǎng)絡協(xié)議網(wǎng)絡協(xié)議pCC : 呼叫控制(Call Control)由MS和MSC控制功能舉例 呼叫處理和路由(Call processing and routing) 雙音多頻(DTMF Facilities) 短消息服務(Short Message Service) 附加服務(Supplementary Service)GSM網(wǎng)絡協(xié)議網(wǎng)絡協(xié)議t呼叫流程中常用的邏輯信道pPCH尋呼信道(Paging Channel)pRACH隨機接入信道(Random Access Channel)pAGCH接入認可信道(Access Grant Channel)pSDCCH獨立專用控制信道(Stand-

5、alone Dedicated Control Channel)pSACCH慢聯(lián)系控制信道(Slow Associated Channel)pTCH話務信道(Traffic Channel)pFACCH快聯(lián)系控制信道(Fast Associated Control Channel)GSM呼叫流程中常用的邏輯信道呼叫流程中常用的邏輯信道PCHRACHAGCHSDCCH + SACCHTCH/FACCH + SACCHt定義p手機與網(wǎng)絡間建立一個無線鏈路,用于信令傳送p包括以下四個步驟Paging過程(Paging Procedure)(僅用于被叫流程中)隨機接入過程(Random Access

6、Procedure)立即分配過程(Immediate Assignment Procedure)SCCP聯(lián)接建立過程(SCCP Connection Establishment Procedure) 當手機需要與網(wǎng)絡發(fā)生聯(lián)系時,必須要當手機需要與網(wǎng)絡發(fā)生聯(lián)系時,必須要先建立無線鏈路和先建立無線鏈路和A A接口的信令連接接口的信令連接無線鏈路建立流程無線鏈路建立流程MSBTSBSCMSCChannel RequestChannel RequiredChannel Activation(SD)Channel Act Ack (SD)Immediate AssignmentCommandUI Imm

7、 Assignment / Imm Ass ExtST9103ET9103ST3126ET3126ST3101SABM L3 InfoEst Ind L3 InfoSCCP Con Rqrd L3SCCP Conn ConfirmET3101ST9105ET9105UA L3 Info(RACH)()(Est Cause,Rnd Nbr)(Est Cause,Rnd Nbr,TA)RACH_TA_FilteringRACH_TA_Filtering(TA,BS/MS_TxPwr -Max,Chann)TimerTimer;S - StartS - Start;E - EndE - EndEnt

8、ityEntity信令消息信令消息空中接口空中接口AbisAbis接口接口A A接口接口(Rnd Nbr,TDMA Frame Nbr,Chan ,TA)(AGCH)同時對兩個同時對兩個MSMS分配分配SDCCHSDCCH(SDCCH)BSCBSC開始對開始對MSMS發(fā)出的上行發(fā)出的上行DTAPDTAP消息排消息排隊(如隊(如CM Serv AbortCM Serv Abort消息)。如果消息)。如果收到收到MSMS發(fā)出的發(fā)出的Classmark ChangeClassmark Change消消息,息,BSCBSC會在會在SCCPSCCP連接完成后發(fā)連接完成后發(fā)Classmark Update

9、Classmark Update消息給交換機消息給交換機如如CM Serv ReqCM Serv Req,Pag ResPag Res,Loc Update ReqLoc Update Req等等Set Asynchronous Set Asynchronous Balance ModeBalance Mode。在任在任何新信道登陸時均會何新信道登陸時均會有有SABMSABM過程過程Unnumbered AckUnnumbered Ack無線鏈路建立流程無線鏈路建立流程無線鏈路建立流程無線鏈路建立流程AbistAbis信令tChannel Required無線鏈路建立流程無線鏈路建立流程Abi

10、stChannel Activation無線鏈路建立流程無線鏈路建立流程AbistImmediately Assignment無線鏈路建立流程無線鏈路建立流程異常情況異常情況tSDCCH擁塞p如果BSC在收到Channel Required時,相應小區(qū)沒有空閑的SDCCH,BSC將會如果小區(qū)參數(shù)En_Imm_Ass_Rej=“True”,則發(fā)Immediately Assignment Reject否則忽略Channel Required消息tT9103超時pBSC發(fā)RF Channel Release消息到BTStBSC收到Channel Activation NAck消息pBSC內(nèi)部釋放B

11、TS的相應無線信道 (沒有任何消息在Abis接口上傳送) tT3101超時pLayer 3無法建立 pBSC發(fā)RF Channel Release到BTStT9105超時pBSC通過呼叫釋放過程( Call Release Procedure)釋放原先建立的SDCCH連接在A接口,BSC向MSC發(fā)SCCP釋放請求 在RF部分,BSC向手機和BTS發(fā)信道釋放消息 僅在僅在BSCBSC內(nèi)部資源表中釋放,在內(nèi)部資源表中釋放,在AbisAbis上沒有信令傳送上沒有信令傳送tBSC收到Establish Indication消息,但消息中不含Layer 3 InformationpBSC向手機和BTS發(fā)

12、信道釋放消息tAbis上的其它異常中斷消息的處理pBSC收到Error IndicationCause為 : “T200 Expiry” : 監(jiān)視SABM和UA過程“Unsolicited DM Response” (發(fā)生在Disconnect過程中)“Sequence Error”釋放: A接口上,BSC發(fā)Clear Request “Radio Interface Failure”到交換機 BSC向手機和BTS發(fā)信道釋放消息pBSC收到Connection Failure indication (Cause : Radio Link Failure)在A接口上,BSC發(fā)Clear Requ

13、est “Radio Interface Failure”到交換機BSC向BTS發(fā)RF Channel Release消息pBSC收到Release Indication當收到手機發(fā)出的DISC消息 A接口上,BSC發(fā)Clear Request “Radio Interface Failure”到交換機 BSC向手機和BTS發(fā)信道釋放消息無線鏈路建立流程無線鏈路建立流程異常情況異常情況MSBTSBSCMSCAuthentication ReqCiphering Mode CmdAuthentication ReqAuthentication ReqAuthentication RespAuth

14、entication RespAuthentication RespEncryption CommandCiphering Mode CmdCiphering Mode CmpCiphering Mode CmpCiphering Mode CmpTMSI Realloc CmdTMSI Realloc CmdTMSI Realloc CmdTMSI Realloc CmpTMSI Realloc CmpTMSI Realloc CmpAuthenticationCipheringTMSI ReallocST3260ET3260*Authentication Reject*Identifica

15、tionIdentification RequestST3270ET3270Identification RequestIdentification RequestIdentification ResponseIdentification RespIdentification ResponseST3250ET3250(RAND)(SRES)RANDRAND與與KiKi經(jīng)過經(jīng)過A3A3算法算法得到得到SRESSRES;經(jīng)過經(jīng)過A8A8算算法得到法得到KcKc比較比較SRESSRES(IMSI)選擇加密算法選擇加密算法(Permitted Alg,Kc)準備解密接收準備解密接收(Alg,Kc)(A

16、lg(A5算法)算法)開始加開始加密發(fā)射密發(fā)射和解密和解密接收接收如正確解密接收,則下條如正確解密接收,則下條消息加密發(fā)射消息加密發(fā)射已加密的消息已加密的消息(TMSI)VLRVLR從從HLRHLR處得處得到到RAND/SRRAND/SRES/KcES/Kc鑒權、身份識別、加密、鑒權、身份識別、加密、TMSI重重新分配過程新分配過程鑒權、身份識別、加密、鑒權、身份識別、加密、TMSI重重新分配過程新分配過程A口信令口信令tAuthentication Request鑒權、身份識別、加密、鑒權、身份識別、加密、TMSI重重新分配過程新分配過程A口信令口信令tAuthentication Resp

17、onse鑒權、身份識別、加密、鑒權、身份識別、加密、TMSI重重新分配過程新分配過程A口信令口信令tIdentification Responset鑒權過程中的異常情況p鑒權失敗如果鑒權過程中使用TMSI,網(wǎng)絡將啟動身份識別過程。如果手機送上來的IMSI與VLR中TMSI所對應的IMSI不一致,則重新進行鑒權如果鑒權過程中已經(jīng)使用IMSI,則網(wǎng)絡發(fā)Authentication Reject消息。這個SIM將被認為是無權的pT3260超時第一次超時,網(wǎng)絡將重發(fā)鑒權請求;第二次超時,網(wǎng)絡將釋放該MM連接t身份識別過程中的異常情況pT3270超時第一次超時,網(wǎng)絡將重發(fā)身份識別請求;第二次超時,網(wǎng)絡將

18、釋放該MM連接tTMSI重新分配過程中的異常情況pT3250超時第一次超時,網(wǎng)絡將重發(fā)TMSI重新分配請求;第二次超時,網(wǎng)絡將釋放該MM連接鑒權、身份識別、加密、鑒權、身份識別、加密、TMSI重重新分配過程新分配過程異常情況異常情況t定義p分配TCH的過程p特殊情況排隊(Queuing)直接重試(Directed Retry)TCH分配過程分配過程MSBTSBSCMSCChannel Activation TCHSABM (FACCH)Channel Activation Ack.Assignment CommandAssignment CommandAssignment RequestPhy

19、sical Context RequestPhysical Context ConfirmEstablish IndicationUAAssignment CompleteAssignment CompleteAssignment CmpRF Channel Release (SD)RF Channel Release Ack.STrr1ETrr1ST9108ET9108ST9103ET9103ST3107ET3107(Chn Type,Priority,CIC,DL DTX,Queuing Flag)(TA,MS/BS_TxPwr)(SDCCH)(TA,MS/BS_TxPwr)(MA,TS,

20、HSN,MAIO,MS_TxPwr)占用占用TCHTCH時,如需傳送信令,則通過時,如需傳送信令,則通過Stealing FlagStealing Flag將將TCHTCH轉(zhuǎn)換成轉(zhuǎn)換成FACCHFACCH一般情況下,在一般情況下,在RFRF信道釋放前都有信道釋放前都有Physical Context ReqPhysical Context Req過程過程TCH分配過程分配過程TCH分配過程分配過程A口口tAssignment RequestEFRQueuingTCH分配過程分配過程AbistAssignment CommandFrequency Encoding(Bitmap 0)MSBTSB

21、SCMSCSABM (FACCH)Channel ActivationHO CMDAssignment RequestPhysical Con ReqChan. Act. Ack.HO DetectionUAPhys. InfoAssignment CmpST11ST3103Queuing IndicationET11At this time, a TCH become freeTCH擁塞和排隊Assignment RequestST11Queuing IndicationET11A Handover alarm is raised. A target BTS is selectedHO CM

22、DHO AccessST9103ET9103TTSTTEstablish IndicationTTHO CMPTHO CMPST3124ET3124ET3103直接重試如果如果Queuing Ind=TrueQueuing Ind=True或或Queuing_Anyway=TrueQueuing_Anyway=True。(。(當當Queuing _AnywayQueuing _Anyway時時T11_ForcedT11_Forced取代取代T11T11TCH分配過程分配過程排隊和直接重試排隊和直接重試tTCH擁塞情況p不允許排隊或隊列已滿在A接口BSC發(fā)Assignment Failure N

23、o Radio Resource Availablep呼叫進入隊列,但T11時間內(nèi)沒有TCH空出在A接口BSC發(fā)Clear Request No Radio Resource Availablep呼叫被優(yōu)先級更高的呼叫擠出隊列在A接口BSC發(fā)Assignment Failure No Radio Resource Available”tT9108超時 : BTS對physical context request沒有響應p之后的Channel Activation消息中將不帶TA和手機及BTS的發(fā)射功率信息tT9103超時 : Channel Activation沒有回應pA接口上BSC發(fā)Ass

24、ignment Failure Radio Interface FailurepBSC向BTS發(fā)RF Channel Release消息TCH分配過程分配過程異常情況異常情況tBSC收到Channel Activation Negative Acknowledge消息pChannel Activation Negative Acknowledge有以下幾種原因 :Channel Already Activated (CAA): BSC向手機和BTS發(fā)信道釋放消息Radio Resource Not Available (RRNA) - Protocol error (PE) : BSC內(nèi)部釋放

25、Requested transcoding rate not supported (RTRNS) : BSC內(nèi)部釋放Encryption algorithm not implemented (EANI) : BSC內(nèi)部釋放O&M Intervention (OI) : BSC內(nèi)部釋放p在A接口上發(fā)Assignment Failure消息對于收到Chnav Neg Ack原因為EANI的情況,Assignment Failure的cause為Ciphering Algorithm not supported其它情況, Assignment Failure的cause為Radio Inte

26、rface FailureTCH分配過程分配過程異常情況異常情況t在原來的信道上(如SDCCH信道)收到Assignment Failure消息 p手機收到Assignment Command后,在新信道上發(fā)SABM消息,BTS收到后向手機發(fā)UA消息。但可能由于空中接口原因,手機沒有收到UA消息。手機嘗試N200次均未成功。p手機將會回到原來的信道。p并發(fā)Assignment Failure消息pBSC收到該消息后在A接口發(fā)Assignment Failure Reversion to Old ChannelpBSC向BTS發(fā)RF Channel Release消息,釋放新信道tAssignm

27、ent Command的內(nèi)容有誤p手機發(fā)現(xiàn)Assignment Command消息中內(nèi)容有誤,手機發(fā)Assignment Failure消息到BSCpBSC收到該消息后在A接口發(fā)Assignment Failure Reversion to Old ChannelpBSC向BTS發(fā)RF Channel Release消息,釋放新信道tT3107超時pBSC在A接口發(fā)Assignment Failure “Radio Interface Message Failure”,并開始T9110計時pBSC向BTS發(fā)RF Channel Release消息,釋放新老信道pMSC向BSC發(fā)Clear Co

28、mmand消息(呼叫釋放),并停止T9110一般情況下,交換機收到該消一般情況下,交換機收到該消息后發(fā)息后發(fā)DISCDISC(temp failtemp fail)TCH分配過程分配過程異常情況異常情況t直接重試中的異常情況p沒有Candidate cellBSC在A接口發(fā)Assignment Failure “No Radio Resource Available”pChannel Activation過程中T9103超時 BSC在A接口發(fā)Assignment Failure “Radio Interface Failure”BSC向BTS發(fā)RF Channel Release消息pBSC收

29、到Channel Activation Negative Acknowledge消息Channel Activation Negative Acknowledge有以下幾種原因 : Channel Already Activated (CAA): BSC向手機和BTS發(fā)信道釋放消息 Radio Resource Not Available (RRNA) - Protocol error (PE) : BSC內(nèi)部釋放 Requested transcoding rate not supported (RTRNS) : BSC內(nèi)部釋放 Encryption algorithm not implem

30、ented (EANI) : BSC內(nèi)部釋放 O&M Intervention (OI) : BSC內(nèi)部釋放在A接口上發(fā)Assignment Failure消息 對于收到Chnav Neg Ack原因為EANI的情況,Assignment Failure的cause為Ciphering Algorithm not supported 其它情況, Assignment Failure的cause為Radio Interface FailureTCH分配過程分配過程異常情況異常情況pT3103超時 : 沒有收到HO Failure或HO Complete消息BSC在A接口發(fā)Assignme

31、nt Failure “Radio Interface message Failure”BSC向手機和BTS發(fā)信道釋放消息,釋放新老信道p收到手機發(fā)來的HO Failure消息BSC在A接口發(fā)Assignment Failure “Reversion to Old Channel”消息BSC向BTS發(fā)RF Channel Release消息,釋放新信道tAbis上的其它異常中斷消息的處理pBSC收到Connection Failure Indicaiton消息Cause為 : “Radio Interface Failure” : 無線鏈路超時引起的釋放釋放: A接口上,BSC發(fā)Clear R

32、equest “Radio Interface Failure”到交換機 BSC向BTS發(fā)RF Channel Release消息pBSC收到Error Report消息pBSC收到Error Indication消息pBSC收到Release Indication消息tA中繼信道擁塞或不可用情況TCH分配過程分配過程異常情況異常情況主叫過程(非主叫過程(非OACSU情況)情況)MSBTSBSCMSCCall ProceedingESTIN (CM_Serv_Req)RR Connection EstablishmentRR Connection EstablishmentRR Connect

33、ion EstablishmentAuthentication ProcedureAuthentication ProcedureAuthentication ProcedureCiphering ProcedureCiphering ProcedureCiphering ProcedureTMSI Realloc ProcedureTMSI Realloc ProcedureTMSI Realloc ProcedureSETUPSETUPSETUPCall ProceedingCall ProceedingAssignment ProcedureAssignment ProcedureAss

34、ignment ProcedureAlertingAlertingAlertingConnectConnectConnectConnect Ack.Connect Ack.Connect Ack.SpeechCM_Serv_ReqOff Air Call SetupOff Air Call Setup(called party nbr)先建立先建立TCHTCH,再再接通接通B B側信道。側信道。AlertingAlerting在在TCHTCH上發(fā)送上發(fā)送(CM Serv Type,Mobile ID,Classmark2,Priority,),)SDCCHTCH主叫過程主叫過程 A口口tCM

35、Service Request主叫:主叫:MOC est/pkt mode con estab短信:短信:Short message service附加服務:附加服務:Suppl service activationCLASSMARKtCLASSMARKp包含以下信息MS Revision Level 手機的修正版本MS Ciphering Capability 手機支持的加密算法MS Frequency Capability 手機支持的頻段MS RF Power Capability in Each Band 手機在各頻段支持的發(fā)射功率主叫過程主叫過程 A口口tSetup主叫過程主叫過程 A

36、口口被叫號碼被叫號碼MSBTSBSCMSCCall ProceedingESTIN (CM_Serv_Req)RR Connection EstablishmentRR Connection EstablishmentRR Connection EstablishmentAuthentication ProcedureAuthentication ProcedureAuthentication ProcedureCiphering ProcedureCiphering ProcedureCiphering ProcedureTMSI Realloc ProcedureTMSI Realloc

37、ProcedureTMSI Realloc ProcedureSETUPSETUPSETUPCall ProceedingCall ProceedingAssignment ProcedureAssignment ProcedureAssignment ProcedureAlertingAlertingAlertingConnectConnectConnectConnect Ack.Connect Ack.Connect Ack.SpeechCM_Serv_ReqSDCCHTCH先接通先接通B B側信道側信道,再建立,再建立TCH TCH 。AlertingAlerting在在SDCCHSDC

38、CH上發(fā)送上發(fā)送主叫過程(主叫過程(OACSU情況)情況)MSBTSBSCMSCCall ConfirmedESTIN (Paging Resp)RR Connection EstablishmentRR Connection EstablishmentRR Connection EstablishmentAuthentication ProcedureAuthentication ProcedureAuthentication ProcedureCiphering ProcedureCiphering ProcedureCiphering ProcedureTMSI Realloc Proc

39、edureTMSI Realloc ProcedureTMSI Realloc ProcedureSETUPSETUPSETUPCall ConfirmedCall ConfirmedAssignment ProcedureAssignment ProcedureAssignment ProcedureAlertingAlertingAlertingConnectConnectConnectConnect Ack.Connect Ack.Connect Ack.SpeechPaging ResponsePagingPaging CommandPaging RequestST3113ET3113

40、Paging GroupPaging Group的個數(shù)(的個數(shù)(N N):):由由BS_AG_BLKS_RESBS_AG_BLKS_RES和和BS_PA_MFRMSBS_PA_MFRMS決定決定; ;MSMS的的Paging Group = (IMSI mod 1000) mod Paging Group = (IMSI mod 1000) mod N;MSN;MS只監(jiān)聽自己對應的只監(jiān)聽自己對應的Paging GroupPaging Group的的Paging ReqPaging Req消息消息(MS ID(TMSI/IMSI),),Cell ID(LAC/LAC+CI)(MS ID(TMSI

41、/IMSI),),Paging Group)(MS ID(TMSI/IMSI)(最多可同時發(fā)最多可同時發(fā)4個個TMSI)(Mobile ID,Classmark2,Priority,),)(calling party nbr)被叫過程被叫過程tPaging被叫過程被叫過程 A口口IMSI號碼,號碼,BSC用來計算用來計算Paging GroupTMSI號碼,空中接口號碼,空中接口Paging時用,比較經(jīng)濟時用,比較經(jīng)濟LAC PagingtA口信令被叫過程被叫過程 A口口tSetup被叫過程被叫過程 A口口主叫號碼主叫號碼tT3113超時p如果T3113超時,Paging Response消息

42、沒有收到,網(wǎng)絡會重發(fā)Paging消息,并重新開始T3113計時。重試的次數(shù)在交換機中定義。Paging失敗失敗MSBTSBSCMSCClear CMDESTIN (Loc Up Req)RR Connection EstablishmentRR Connection EstablishmentRR Connection EstablishmentAuthentication ProcedureAuthentication ProcedureAuthentication ProcedureCiphering ProcedureCiphering ProcedureCiphering Proced

43、ureTMSI Realloc ProcedureTMSI Realloc ProcedureTMSI Realloc ProcedureLoc Up AcceptChannel ReleaseDeactivate SACCHDISCRelease IndicationUARF Ch ReleaseLoc Up ReqLoc Up AcceptLoc Up AcceptChannel ReleaseRF Ch Release AckClear CMPST3210ET3210(LU Type,MS ID,LAI,Classmark1,),)位置更新過程位置更新過程tLocation Update

44、 Request位置更新過程位置更新過程 A口口位置更新后沒有后續(xù)的(位置更新后沒有后續(xù)的(Follow-on)呼叫過程呼叫過程手機原來的手機原來的LAC手機的手機的TMSItLocation Update Accept位置更新過程位置更新過程 A口口新的新的LAC重新分配的重新分配的TMSIt切換分為p小區(qū)內(nèi)切換(IntraCell Internal Handover) : 切換原因 (按優(yōu)先級排序) Cause 15 & 16 干擾切換(High level interference on UL or DL). Cause 10 & 11 : 同心圓內(nèi)圓電平過低而向外園切換

45、(Too low level, inner zone (inner to outer zone HO, concentric cell) (UL & DL)) Cause 13 : 同心圓外圓電平較高時向內(nèi)圓切換(Too high level on the UL and DL, outer zone (outer to inner zone HO, concentric cell))pBSC內(nèi)部小區(qū)間切換(Intercell Internal Handover)切換原因 (按優(yōu)先級排序) Cause 7 : 微小區(qū)BadSACCH切換(Several consecutive Bad S

46、ACCH frames received (rescue microcell HO)) Cause 17 & 18 : 微小區(qū)高門限切換(Too low level in a microcell compared to a high threshold (UL & DL)) Cause 2 & 4 : 質(zhì)量切換(Too Low Quality (UL & DL)) Cause 3 & 5 : 電平切換(Too Low Level (UL & DL)) Cause 6 : 太長距離且換(Too long MS-BS distance) Cause

47、22: 擴站小區(qū)外小區(qū)太短距離切換(Too short MS-BS distance) Cause20: 強制直接重試(Forced Direct Retry) Cause25: GPRS重定向(GPRS Redirection )切換過程切換過程 Cause 21: Preferred Band切換(High level in neighbor cell in the preferred band) Cause 14: 宏小區(qū)到微小區(qū)切換(High level in a neighbor microcell for macrocell to microcell HO.) Cause 12:

48、PBGT切換(Power Budget (Better Cell HO)) Cause 23: 話務切換(Traffic HO) Cause 24: 綜合捕捉切換(General Capture HO)p同步切換Intra Cell切換部分Internal Inter Cell切換p異步切換切換過程切換過程MSBTSBSCMSCMeasurement RepMeasurement ResIntra cell切換Phys Context ReqOCOCPhys Context ConfOC : Old ChannelNC : New ChannelNCNCChannel Activation A

49、ckChannel Activation Assignment CommandAssignment CommandOCSABMEstablish IndicationUAOCNCNCNCAssignment CompleteNCAssignment CompleteHandover PerformedRF Channel RelOCRF Channel Rel Ack.OCST9108ET9108ST9103ET9103ST3107ET3107ST_RCR_ACKET_RCR_ACK原信道上的原信道上的TATA、MS/BS_TxPwrMS/BS_TxPwr被沿用到被沿用到了新的信道上了新的信道

50、上IntraCell HOIntraCell HO總是用總是用AssignmentAssignment的過程來完的過程來完成成(HO Cause,Cell ID,Chn Type)Intra Cell切換過程切換過程tAssignment CommandIntra Cell切換過程切換過程 Abis原來的原來的TCH信道信道新分配的新分配的TCH信道信道(頻點頻點84)tTCH擁塞pIntra Cell切換將不會發(fā)生tT9108超時 : BTS對physical context request沒有響應p之后的Channel Activation消息中將不帶TA和手機及BTS的發(fā)射功率信息tT9

51、103超時 : Channel Activation沒有回應pIntra Cell切換過程將終止pA接口上不會有任何消息傳送pBSC向BTS發(fā)RF Channel Release消息,釋放新信道tBSC收到Channel Activation Negative Acknowledge消息pIntra Cell切換過程將終止pChannel Activation Negative Acknowledge有以下幾種原因 :Channel Already Activated (CAA): BSC向手機和BTS發(fā)信道釋放消息Radio Resource Not Available (RRNA) - P

52、rotocol error (PE) : BSC內(nèi)部釋放Requested transcoding rate not supported (RTRNS) : BSC內(nèi)部釋放Encryption algorithm not implemented (EANI) : BSC內(nèi)部釋放O&M Intervention (OI) : BSC內(nèi)部釋放pA接口上不會有任何消息傳送Intra Cell切換過程切換過程異常情況異常情況t在原來的信道上(如SDCCH信道)收到Assignment Failure消息 pIntra Cell切換過程將終止pA接口上不會有任何消息傳送pBSC向BTS發(fā)RF C

53、hannel Release消息,釋放新信道tAssignment Command的內(nèi)容有誤,手機發(fā)Assignment Failure消息到BSCpIntra Cell切換過程將終止pA接口上不會有任何消息傳送pBSC向BTS發(fā)RF Channel Release消息,釋放新信道tT3107超時pBSC在A接口發(fā)Clear Request “Radio Interface Message Failure”pBSC向BTS發(fā)RF Channel Release消息,釋放新老信道p形成切換掉話t其它異常中斷消息pError ReportpConnection Failure Indication

54、pRelease IndicationpError IndicationIntra Cell切換過程切換過程異常情況異常情況MSBTSservingBSCMSCBTStargetMeas ReportMeas ResultHO Alarm & Candidate CellPhys Context ReqPhys Context ConfChannel ActivationChannel Act Ack.HO CommandHO CommandHO AccessHO DetectionSABMEstablish IndUAHandover CompleteHandover Complet

55、eHandover PerformedRF Channel ReleaseRF Channel Rel. Ack.ST9108ET9108ST9103ET9103ST3103ST3103ST3106ET3106ST_RCR_ACKET_RCR_ACKST200ET200原信道上的原信道上的TATA、被沿用被沿用到了新的信道上,而到了新的信道上,而MS/BS_TxPwrMS/BS_TxPwr將用最大將用最大功率在新的信道上發(fā)射功率在新的信道上發(fā)射(AB,DCH)(Cell,MA,MAIO,HSN,TS,TA)(TA被采用)被采用)Internal Inter Cell切換過程切換過程同同步切換步

56、切換MSBTSservingBSCMSCBTStargetHO Alarm & Candidate CellChannel ActivationChannel Act Ack.HO CommandHO CommandHO AccessHO DetectionSABMEstablish IndUAHandover CompleteHandover CompleteHandover PerformedRF Channel ReleaseRF Channel Rel. Ack.ST9103ET9103ST3103ST3103ST3105ET3105Physical InfoST3124ET3

57、124ST200ET200ST_RCR_ACKET_RCR_ACKPhys Context ReqPhys Context ConfST9108ET9108Meas ReportMeas Result沒有沒有Physical Cont Physical Cont ReqReq過程,原信道上的過程,原信道上的TATA不能被沿用到新的信不能被沿用到新的信道上道上測量測量TATA(TA)(TA被采用)被采用)在在RFRF信道釋放前,有信道釋放前,有Physical Physical Context ReqContext Req過程過程Internal Inter Cell切換過程切換過程異異步切換步

58、切換Internal Inter Cell切換過程切換過程A口口tHO Performed切換原因切換原因目標小區(qū)目標小區(qū)tTCH擁塞pInternal Inter Cell切換將不會發(fā)生tT9108超時(同步切換)p同Intra Cell情況tT9103超時p同Intra Cell情況tBSC收到Channel Activation Negative Acknowledge消息p同Intra Cell情況Internal Inter Cell切換過程切換過程異異常情況常情況t在原來的信道上(如SDCCH信道)收到HO Failure消息 pInternal Inter Cell切換過程將終止

59、pA接口上不會有任何消息傳送pBSC向BTS發(fā)RF Channel Release消息,釋放新信道tHO Command的內(nèi)容有誤,手機發(fā)HO Failure消息到BSCpInternal Inter Cell切換過程將終止pA接口上不會有任何消息傳送pBSC向BTS發(fā)RF Channel Release消息,釋放新信道tT3103超時pBSC在A接口發(fā)Clear Request “Radio Interface Message Failure”pBSC向BTS發(fā)RF Channel Release消息,釋放新老信道p形成切換掉話t其它異常中斷消息pError ReportpConnectio

60、n Failure IndicationpRelease IndicationpError IndicationInternal Inter Cell切換過程切換過程異異常情況常情況MSBTSservingBSCservingMSCBTStargetMeas ReportMeas ResultHO Alarm & Candidate CellChannel ActivationChannel Act Ack.HO CommandHO CommandHO AccessHO DetectionSABMEstablish IndUAHandover CompleteHandover CompleteHO CompleteRF Channel ReleaseRF Ch. Rel. Ack.BSCta

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