1、 HANTELEHANTELELTE系統(tǒng)結(jié)構(gòu)及EPC信令流程2013年10月目 錄 ContentsEPC主要信令流程相關(guān)學(xué)習(xí)材料HANTELEHANTELELTE網(wǎng)絡(luò)結(jié)構(gòu)與協(xié)議 HANTELEHANTELELTE網(wǎng)絡(luò)結(jié)構(gòu)與協(xié)議HANTELEHANTELE3 HANTELEHANTELELTE標(biāo)準(zhǔn)化歷程R82008年12月發(fā)布的LTE R8系列規(guī)范，是第一個(gè)LTE可商用的標(biāo)準(zhǔn)文本。R9針對(duì)R8階段沒有完成和包含的特性，是R8版本的完善和增強(qiáng)。R9主要包括LTE終端定位技術(shù)、增強(qiáng)的下行雙流波束賦形傳輸、eMBMS基本功能、網(wǎng)絡(luò)自優(yōu)化（SON）、Home eNodeB功能等。LTE-A(R10)載

2、波聚合、增強(qiáng)的上下行MIMO、協(xié)作多點(diǎn)傳輸CoMP、中繼（Relay）、異構(gòu)網(wǎng)（Heterogeneous Network）。4 HANTELEHANTELELTE網(wǎng)絡(luò)結(jié)構(gòu)5LTE核心網(wǎng)即演進(jìn)型分組核心網(wǎng)（EPC），EPC網(wǎng)絡(luò)設(shè)備包括移動(dòng)性管理設(shè)備（MME）、服務(wù)網(wǎng)關(guān)（S-GW）、PDN網(wǎng)關(guān)（P-GW）、服務(wù)GPRS支持節(jié)點(diǎn)（SGSN）、歸屬簽約用戶服務(wù)器（HSS）以及策略和計(jì)費(fèi)控制單元（PCRF）等組成。其中S-GW和P-GW可以合設(shè)，也可以分設(shè)。 HANTELEHANTELELTE網(wǎng)元功能6MME的主要功能包括：支持NAS信令及其安全、跟蹤區(qū)域（Tracking Area）列表的管理、P-

3、GW和S-GW的選擇、跨MME切換時(shí)MME的選擇、在向2G/3G接入系統(tǒng)切換過程中SGSN的選擇、用戶的鑒權(quán)、漫游控制以及承載管理、3GPP不同接入網(wǎng)絡(luò)的核心網(wǎng)絡(luò)節(jié)點(diǎn)之間的移動(dòng)性管理，以及UE在ECM-IDLE狀態(tài)下可達(dá)性管理等。S-GW是終止于E-UTRAN接口的網(wǎng)關(guān)，該設(shè)備的主要功能包括：eNodeB間切換時(shí)的本地錨定點(diǎn)、3GPP不同接入系統(tǒng)間切換時(shí)的移動(dòng)性錨點(diǎn)、執(zhí)行合法偵聽功能、數(shù)據(jù)包的路由和前轉(zhuǎn)、上下行傳輸層的分組標(biāo)記、ECM-IDLE狀態(tài)下分組緩存及尋呼觸發(fā)、計(jì)費(fèi)等。P-GW是面向PDN終結(jié)于SGi接口的網(wǎng)關(guān)，該設(shè)備的主要功能包括：基于用戶的包過濾功能、合法偵聽功能、UE的IP地址分

4、配功能、上下行傳輸層的分組標(biāo)記、計(jì)費(fèi)、門控、QoS控制、承載控制等。HSS是用于存儲(chǔ)用戶簽約信息的數(shù)據(jù)庫，該設(shè)備的主要功能包括：存儲(chǔ)用戶簽約信息、用戶鑒權(quán)、位置信息管理等。PCRF終結(jié)于Rx接口和Gx接口，該設(shè)備主要功能包括：提供基于業(yè)務(wù)數(shù)據(jù)流的QoS控制、門控和計(jì)費(fèi)控制等。 HANTELEHANTELEEPC系統(tǒng)接口功能7S1-MME:Reference point for the control plane protocol between E-UTRAN and MME.S1-U:Reference point between E-UTRAN and Serving GW for the

5、 per bearer user plane tunnelling and inter eNodeB path switching during handover.S3:It enables user and bearer information exchange for inter 3GPP access network mobility in idle and/or active state.S4:It provides related control and mobility support between GPRS Core and the 3GPP Anchor function o

6、f Serving GW. In addition, if Direct Tunnel is not established, it provides the user plane tunnelling.S5:It provides user plane tunnelling and tunnel management between Serving GW and PDN GW. It is used for Serving GW relocation due to UE mobility and if the Serving GW needs to connect to a non-coll

7、ocated PDN GW for the required PDN connectivity.S6a:It enables transfer of subscription and authentication data for authenticating/authorizing user access to the evolved system (AAA interface) between MME and HSS.S8:Inter-PLMN reference point providing user and control plane between the Serving GW i

8、n the VPLMN and the PDN GW in the HPLMN. S8 is the inter PLMN variant of S5. S9:It provides transfer of (QoS) policy and charging control information between the Home PCRF and the Visited PCRF in order to support local breakout function. HANTELEHANTELEEPC系統(tǒng)接口功能8S10:Reference point between MMEs for M

9、ME relocation and MME to MME information transfer.S11:Reference point between MME and Serving GW.S12:Reference point between UTRAN and Serving GW for user plane tunnelling when Direct Tunnel is established. It is based on the Iu-u/Gn-u reference point using the GTP-U protocol as defined between SGSN

10、 and UTRAN or respectively between SGSN and GGSN. Usage of S12 is an operator configuration option.S13:It enables UE identity check procedure between MME and EIR.SGi:It is the reference point between the PDN GW and the packet data network. Packet data network may be an operator external public or pr

11、ivate packet data network or an intra operator packet data network, e.g. for provision of IMS services. This reference point corresponds to Gi for 3GPP accesses.Gx:It provides transfer of (QoS) policy and charging rules from PCRF to Policy and Charging Enforcement Function (PCEF) in the PDN GW.Rx:Th

12、e Rx reference point resides between the AF and the PCRF in the TS 23.203 6.SBc:Reference point between CBC and MME for warning message delivery and control functions. HANTELEHANTELELTE系統(tǒng)協(xié)議棧9 HANTELEHANTELEEPC協(xié)議匯總10接口連接網(wǎng)元協(xié)議S1-MMEeNodeB - MMES1-AP/SCTP/IP/L2/L1S1-UeNodeB - S-GWGTP-U/UDP/IP/L2/L1S3SGS

13、N - MMEGTP-C/UDP/IP/L2/L1S4SGSN - S-GWGTP-C/UDP/IP/L2/L1GTP-U/UDP/IP/L2/L1S5S-GW - P-GWGTP-C/UDP/IP/L2/L1GTP-U/UDP/IP/L2/L1PMIPTunneling LayerS6aMME - HSSDiameter/SCTP/IP/L2/L1S7(Gx)PCRF - P-GW(PCEF)Diameter/SCTP/IP/L2/L1S8S-GW - P-GW(Inter PLMN)Same as S5S9V-PCRF - H-PCRFDiameter/SCTP/IP/L2/L1S10MM

14、E - MMEGTP-C/UDP/IP/L2/L1S11MME - S-GWGTP-C/UDP/IP/L2/L1S12UTRAN - S-GWGTP-U/UDP/IP/L2/L1S13MME - EIRSGiP-GW - Operators IP networkDHCP,Radius,L2TP,GRERxPCRF - Operators IP ServiceDiameter/SCTP/IP/L2/L1 HANTELEHANTELEX2接口協(xié)議11 X2-AP Transport Network Layer User Transport Network Plane Control Plane U

15、ser Plane Transport User Network Plane Radio Network Layer GTP-U UDP IP Data link layer Physical layer User Plane PDUs SCTP IP Data link layer Physical layer X2 Interface protocol structureX2接口是eNodeB之間的接口。X2接口的定義采用了與S1接口一致的原則，因此X2接口的用戶平面協(xié)議結(jié)構(gòu)和控制平面協(xié)議結(jié)構(gòu)均與S1接口類似。 HANTELEHANTELEEPS系統(tǒng)標(biāo)識(shí)12（1）全球唯一臨時(shí)標(biāo)識(shí)符（Glo

16、bally Unique Temporary UE Identity, GUTI）MME要給UE分配全球唯一臨時(shí)標(biāo)識(shí)符GUTI，目的是提供UE永久標(biāo)識(shí)IMSI的保密性。GUTI包括兩部分：用于唯一標(biāo)識(shí)分配GUTI的MME，即GUMMEI；用于唯一標(biāo)識(shí)該MME中的UE，即M-TMSI。在尋呼時(shí)，UE是用S-TMSI來進(jìn)行尋呼的。S-TMSI由MMEC和M-TMSI組成。 HANTELEHANTELEEPS系統(tǒng)標(biāo)識(shí)13（2）跟蹤區(qū)域標(biāo)識(shí)符（TAI）和跟蹤區(qū)列表TAI用于標(biāo)識(shí)跟蹤區(qū)域。TAI由MCC，MNC和TAC組成。E-UMTS可以讓UE向多個(gè)跟蹤區(qū)域注冊(cè)，多個(gè)跟蹤區(qū)域組成TA列表。只要UE仍然

17、在它所注冊(cè)的TA列表內(nèi)，除了周期性的TA更新外，UE無須任何TA更新。多個(gè)TA注冊(cè)機(jī)制有助于位于跟蹤區(qū)域邊緣的終端降低TA更新次數(shù)。UE的TAI由MME負(fù)責(zé)分配，MME可以在用戶附著或跟蹤區(qū)更新時(shí)，將跟蹤區(qū)列表發(fā)給用戶。UE認(rèn)為已向整個(gè)TA列表進(jìn)行了注冊(cè)，直到進(jìn)入一個(gè)不屬于列表的TA或從網(wǎng)絡(luò)得到了更新的列表。（3）eNB S1-AP UE ID該標(biāo)識(shí)符用于在S1-MME參考點(diǎn)的eNodeB側(cè)來臨時(shí)標(biāo)識(shí)UE，在一個(gè)eNodeB內(nèi)是唯一的。（4）MME S1-AP UE ID該標(biāo)識(shí)符用于在S1-MME參考點(diǎn)的MME側(cè)來臨時(shí)標(biāo)識(shí)UE，在一個(gè)MME內(nèi)是唯一的。（5）EPS承載標(biāo)識(shí)符（EPS Beare

18、r Identity, EBI）EPS承載標(biāo)識(shí)符由MME分配，用于唯一標(biāo)識(shí)UE接入到E-UTRAN的一個(gè)EPS承載，在承載建立過程中傳遞給S-GW/P-GW使用。EPS無線承載（Radio Bearer）用于UE和eNodeB間傳輸E-RAB分組，EPS無線承載與EPS承載存在著一一映射，這種映射是由E-UTRAN來實(shí)現(xiàn)的。（6）TEID（Tunnel Endpoint ID）在基于GTP通信的兩個(gè)節(jié)點(diǎn)間使用GTP隧道，每個(gè)GTP隧道在一個(gè)節(jié)點(diǎn)的標(biāo)識(shí)同時(shí)使用IP地址、UDP端口和TEID。 HANTELEHANTELE一些基本流程及術(shù)語14 HANTELEHANTELEEPS承載架構(gòu)15端到端

19、業(yè)務(wù)可以分為兩部分承載：EPS承載和外部承載。外部承載用于連接核心和外部網(wǎng)節(jié)點(diǎn)間的業(yè)務(wù)承載。EPS承載則可以分為EPS無線承載、S1承載和S5/S8承載三部分。EPS承載相當(dāng)于2G GPRS/3G UMTS中使用的“PDP上下文”。 HANTELEHANTELEEPS默認(rèn)承載和專用承載16默認(rèn)承載（Default Bearer）：在UE初始附著過程中按照用戶簽約的默認(rèn)QoS等級(jí)建立一個(gè)默認(rèn)承載，在PDN連接業(yè)務(wù)存在期間會(huì)始終保持這個(gè)默認(rèn)承載，給UE提供“永遠(yuǎn)在線”的IP連接。專用承載（Dedicated Bearer）：連接到相同PDN的其他EPS承載稱為專用承載。默認(rèn)承載一定是Non-GBR

20、承載；專用承載可以是GBR，也可以是Non-GBR承載。通過UE的初始附著過程，建立起一個(gè)PDN連接，一個(gè)默認(rèn)承載建立。根據(jù)業(yè)務(wù)需求，網(wǎng)絡(luò)側(cè)發(fā)起專用承載建立，可以存在一個(gè)或多個(gè)專用承載。下圖是一個(gè)PDN連接（即一個(gè)GTP會(huì)話）上，存在一個(gè)默認(rèn)承載和一個(gè)專用承載的情況。 HANTELEHANTELEQoS Class Identifier17 HANTELEHANTELEEPS狀態(tài)管理18EPS有3種狀態(tài)管理模型：EMM（EPS Mobility Management）EPS移動(dòng)性管理模型EMM-DEREGISTEREDEMM-REGISTERED描述的是UE在網(wǎng)絡(luò)中的注冊(cè)狀態(tài)，EMM狀態(tài)的改變

21、是由于移動(dòng)性管理過程產(chǎn)生的，比如附著過程和TAU過程。ECM（ EPS Connection Management）EPS連接性管理模型ECM-IDLEECM-CONNECTED描述的是UE和EPC間的信令連接性。在ECM-IDLE狀態(tài)，UE和網(wǎng)絡(luò)間沒有NAS信令連接，在E-UTRAN中也沒有UE上下文，沒有S1-MME連接。在ECM-CONNECTED狀態(tài)下，UE和網(wǎng)絡(luò)間有信令連接，包括RRC連接和S1-MME連接。ESM（ EPS Session Management）EPS會(huì)話管理模型BEARER CONTEXT INACTIVE 沒有默認(rèn)承載，也沒有專用承載BEARER CONTEXT

22、 ACTIVE 至少有一個(gè)承載存在 HANTELEHANTELEEPS狀態(tài)轉(zhuǎn)移19 HANTELEHANTELEEPS狀態(tài)轉(zhuǎn)移20“ECM Connected = RRC Connection + S1 Connection” HANTELEHANTELENAS協(xié)議消息列表21 HANTELEHANTELENAS協(xié)議信令流程22 HANTELEHANTELENAS協(xié)議信令流程23 HANTELEHANTELENAS協(xié)議信令流程24 HANTELEHANTELENAS協(xié)議信令流程25 HANTELEHANTELES1AP協(xié)議消息列表26 HANTELEHANTELES1AP協(xié)議基本信令流程27-

23、Class 1: Elementary Procedures with response (success and/or failure).-Class 2: Elementary Procedures without response.Elementary ProcedureInitiating MessageSuccessful OutcomeUnsuccessful OutcomeResponse messageResponse messageHandover PreparationHANDOVER REQUIREDHANDOVER COMMANDHANDOVER PREPARATION

24、 FAILUREHandover Resource AllocationHANDOVER REQUESTHANDOVER REQUEST ACKNOWLEDGEHANDOVER FAILUREPath Switch RequestPATH SWITCH REQUESTPATH SWITCH REQUEST ACKNOWLEDGEPATH SWITCH REQUEST FAILUREHandover CancellationHANDOVER CANCELHANDOVER CANCEL ACKNOWLEDGEE-RAB SetupE-RAB SETUP REQUESTE-RAB SETUP RES

25、PONSEE-RAB ModifyE-RAB MODIFY REQUESTE-RAB MODIFY RESPONSEE-RAB ReleaseE-RAB RELEASE COMMANDE-RAB RELEASE RESPONSEInitial Context SetupINITIAL CONTEXT SETUP REQUESTINITIAL CONTEXT SETUP RESPONSEINITIAL CONTEXT SETUP FAILUREResetRESETRESET ACKNOWLEDGES1 SetupS1 SETUP REQUESTS1 SETUP RESPONSES1 SETUP

26、FAILUREUE Context ReleaseUE CONTEXT RELEASE COMMANDUE CONTEXT RELEASE COMPLETEUE Context ModificationUE CONTEXT MODIFICATION REQUESTUE CONTEXT MODIFICATION RESPONSEUE CONTEXT MODIFICATION FAILUREeNB Configuration UpdateENB CONFIGURATION UPDATEENB CONFIGURATION UPDATE ACKNOWLEDGEENB CONFIGURATION UPD

27、ATE FAILUREMME Configuration UpdateMME CONFIGURATION UPDATEMME CONFIGURAION UPDATE ACKNOWLEDGEMME CONFIGURATION UPDATE FAILUREWrite-Replace Warning WRITE-REPLACE WARNING REQUESTWRITE-REPLACE WARNING RESPONSEKillKILL REQUESTKILL RESPONSEUE Radio Capability MatchUE RADIO CAPABILITY MATCH REQUESTUE RAD

28、IO CAPABILITY MATCH RESPONSEElementary ProcedureMessageHandover NotificationHANDOVER NOTIFYE-RAB Release IndicationE-RAB RELEASE INDICATIONPagingPAGINGInitial UE MessageINITIAL UE MESSAGEDownlink NAS TransportDOWNLINK NAS TRANSPORTUplink NAS TransportUPLINK NAS TRANSPORTNAS non delivery indicationNA

29、S NON DELIVERY INDICATIONError IndicationERROR INDICATIONUE Context Release RequestUE CONTEXT RELEASE REQUESTDownlinkS1 CDMA2000 TunnelingDOWNLINK S1 CDMA2000 TUNNELINGUplink S1 CDMA2000 TunnelingUPLINK S1 CDMA2000 TUNNELINGUE Capability Info IndicationUE CAPABILITY INFO INDICATIONeNB Status Transfe

30、reNB STATUS TRANSFERMME Status TransferMME STATUS TRANSFERDeactivate TraceDEACTIVATE TRACETrace StartTRACE STARTTrace Failure IndicationTRACE FAILURE INDICATIONLocation Reporting ControlLOCATION REPORTING CONTROLLocation Reporting Failure IndicationLOCATION REPORTING FAILURE INDICATIONLocation Repor

31、tLOCATION REPORTOverload StartOVERLOAD STARTOverload StopOVERLOAD STOPeNB Direct Information TransfereNB DIRECT INFORMATION TRANSFERMME Direct Information TransferMME DIRECT INFORMATION TRANSFEReNB Configuration TransfereNB CONFIGURATION TRANSFERMME Configuration TransferMME CONFIGURATION TRANSFERCe

32、ll Traffic TraceCELL TRAFFIC TRACEDownlink UE Associated LPPa TransportDOWNLINK UE ASSOCIATED LPPA TRANSPORTUplink UE Associated LPPa TransportUPLINK UE ASSOCIATED LPPA TRANSPORTDownlink Non UE Associated LPPa TransportDOWNLINK NON UE ASSOCIATED LPPA TRANSPORTUplink Non UE Associated LPPa TransportU

33、PLINK NON UE ASSOCIATED LPPA TRANSPORTClass 1 proceduresClass 2 procedures HANTELEHANTELEGTP協(xié)議消息列表28 HANTELEHANTELES6a接口消息列表29MME-HSSMME-HSSS6aS6a接口消息接口消息功能功能-Authentication Information Request鑒權(quán)信息請(qǐng)求Update Location Request位置更新請(qǐng)求-Update Location Answer位置更新響應(yīng)，消息里包含了簽約數(shù)據(jù)Cancel Location AnswerInsert Sub

34、scriber Data AnswerDelete Subscriber Data Answer-Purge UE RequestMME通知HSS刪除去附著用戶的簽約數(shù)據(jù)和MM上下文Notify Request當(dāng)用戶狀態(tài)變化，或用戶終端改變，或用戶當(dāng)前APN的PDN GW信息改變時(shí)，MME向HSS發(fā)送此消息-Notify AnswerReset Answer HANTELEHANTELEEPC主要信令流程HANTELEHANTELE30 HANTELEHANTELEEPC主要信令流程31l附著(Attach)流程l去附著(Detach)流程 UE發(fā)起的去附著 MME發(fā)起的去附著 HSS發(fā)起的去附著l業(yè)務(wù)請(qǐng)求(Service Reques