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問題已開啟
(普通問題)
LA/RA Update Procedure
想問下LA/RA Update Procedure完成什么作用，此時PDP激活是一直保存著嗎，其后就可以進行數(shù)據(jù)業(yè)務(wù)是吧
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問題答案
( 3 )
根據(jù)3GPP 24008The location updating procedure is a general procedure which is used for the following purposes:
- normal location updating (described in this subclause);
- periodic updating (see subclause 4.4.2);
- IMSI attach (see subclause 4.4.3).
- normal location updating (described in this subclause);
- periodic updating (see subclause 4.4.2);
- IMSI attach (see subclause 4.4.3).
回答者：
wwwmscbsccom
回答時間：2013-05-15 13:53
36
34
一個系統(tǒng)間改變是在以下場景中產(chǎn)生，MS發(fā)生了Iu模式到A/Gb模式操作的改變，并且是由一個RAU流程或PS handover流程所觸發(fā)的。一個系統(tǒng)間改變的前提條件是MS已經(jīng)GPRS附著了。移動性管理的狀態(tài)轉(zhuǎn)變由相應(yīng)的移動性管理流程來指明。
在系統(tǒng)間改變的流程中，不會發(fā)生會話管理狀態(tài)的轉(zhuǎn)變。
6.13.1 Intra SGSN Intersystem Change
An SGSN that supports both the Gb and Iu PS interfaces may support an intra-SGSN intersystem change if the radio access technology nodes serving the MS before and after the intersystem change are both served by this SGSN.
一個同時支持Gb和Iu PS接口的SGSN可以支持一個intra-SGSN的系統(tǒng)間改變---當之前和之后為MS提供服務(wù)的無線接入技術(shù)節(jié)點由同一個SGSN服務(wù)的時候。
6.13.1.1 Iu mode to A/Gb mode Intra SGSN Change
6.13.1.1.1 Iu mode to A/Gb mode Intra SGSN Change using Gn/Gp
The intersystem change from Iu mode to A/Gb mode takes place when an MS changes from UTRAN or GERAN Iu mode to A/Gb mode. Depending on the PMM state before the intersystem change and whether the RA is changed or not, one of the following procedures is initiated by the MS:
- When an MS in PMM IDLE state changes to the A/Gb mode without changing the RA, the MS shall follow the selective RA update procedures, see clause "Selective RA Update".
- When an MS in PMM IDLE state changes to the A/Gb mode and the RA changes, the MS shall initiate the GPRS RA update procedure, see clause "Intra SGSN Routeing Area Update".
- When an MS in PMM CONNECTED state changes to the A/Gb mode, the MS shall initiate the GPRS RA update procedure independent of whether the RA has changed or not. The RA update procedure is either combined RA / LA update or only RA update.
從Iu模式到A/Gb模式的系統(tǒng)間改變，是在MS發(fā)生了從UTRAN或GERAN Iu模式到A/Gb模式的改變時產(chǎn)生的。根據(jù)在系統(tǒng)間改變發(fā)生之前的PMM狀態(tài)以及RA是否改變，以下流程之一將由MS發(fā)起：
- 當MS在PMM-IDLE狀態(tài)變更到A/Gb模式并且沒改變RA,MS應(yīng)執(zhí)行選擇性的RAU流程，參考章節(jié)“選擇性RA更新”。
- 當MS在PMM-IDLE狀態(tài)變更到A/Gb模式并且RA改變了，MS應(yīng)發(fā)起GPRS RAU流程，參考章節(jié)“Intra SGSN RAU".
- 當MS在PMM-CONNECTED狀態(tài)變更到A/Gb模式,不管有沒有發(fā)生RA變化,MS都應(yīng)發(fā)起一個GPRS RAU流程.這個RAU流程或者是一個聯(lián)合的RA/LAU,或者只是一個RAU.
A combined RA / LA update takes place in network operation mode I when the MS enters a new RA or when a GPRS-attached MS performs IMSI attach. The MS sends a Routeing Area Update Request message indicating that an LA update may also need to be performed, in which case the SGSN forwards the LA update to the VLR. This concerns only idle mode (see TS 23.122 [7b]), as no combined RA / LA updates are performed during a CS connection. In the context of this specification, the terms RNS or RNC refer also to a GERAN BSS or BSC (respectively) when serving an MS in Iu mode.
一 個聯(lián)合的RA/LAU發(fā)生在網(wǎng)絡(luò)操作模式I---并且當MS進入了一個新的RA或當一個GPRS附著的MS執(zhí)行了IMSI附著.MS發(fā)送RAU Request消息指示這是一個LAU可能也需要執(zhí)行,SGSN轉(zhuǎn)發(fā)LAU給VLR.這僅和idle模式有關(guān)(參考TS23.122),因為在一個CS連 接期間沒有聯(lián)合的RA/LAU被執(zhí)行.本規(guī)范中上下文的描述中,RNS或RNC的術(shù)語也可以相應(yīng)參考GERAN BSS或BSC---當為一個Iu模式的MS服務(wù)時.
Figure 52: Iu mode to A/Gb mode Intra SGSN Change
NOTE: All steps in figure 52 are common for architecture variants using Gn/Gp based interaction with a GGSN and using S4 based interactions with an S GW and P GW. For S4 based interaction with an S GW and P GW, procedure step (A) is defined in clause 6.13.1.1.2.
注釋：在圖例52中的所有步驟對于使用Gn/Gp接口和GGSN交互，還是使用S4接口和SGW/PGW交互的架構(gòu)的都是公共的�；赟4接口和SGW/PGW的交互的步驟A，參考章節(jié)6.13.1.1.2。
1) The MS or RAN decides to perform an intersystem change which makes the MS switch to a new cell where A/Gb mode has to be used, and stops transmission to the network.
2) The MS sends a Routeing Area Update Request (old RAI, old P TMSI Signature, Update Type, Voice domain preference and UE's usage setting) message to the 2G+3G SGSN. Update Type shall indicate RA update or combined RA / LA-update or, if the MS wants to perform an IMSI attach, combined RA / LA update with IMSI attached requested. The BSS shall add the Cell Global Identity including the RAC and LAC of the cell where the message was received before passing the message to the 2G+3G SGSN. The UE sets the voice domain preference and UE's usage setting according to its configuration, as described in clause 5.3.15.
If there is an ongoing emergency bearer service and a Routing Area Update Request is received the Routing Area Update shall be rejected with a cause code indicating that access to GERAN is not allowed.
1）MS或RAN決定執(zhí)行一個系統(tǒng)間改變，使得MS能切換到一個新的A/Gb模式下的小區(qū)，并且停止傳遞數(shù)據(jù)到網(wǎng)絡(luò)。
2）MS 發(fā)送RAU請求（old RAI、old P-TMSI簽名、更新類型、語音域優(yōu)先級和UE的使用設(shè)置）消息給2G+3G SGSN。更新類型應(yīng)指明這個一個RAU或是一個聯(lián)合的RA/LAY或者，如果MS想執(zhí)行一個IMSI的附著、帶有IMSI附著請求的聯(lián)合的RA /LAU。BSS應(yīng)加入CGI（小區(qū)全球標識）并包括小區(qū)的RAC和LAC到這個接收的消息中，然后再傳遞給2G+3G SGSN。UE根據(jù)它自己的配置，按照章節(jié)5.3.15的描述，來設(shè)置語音域優(yōu)先級和它的使用設(shè)置。
3) If the MS is PMM CONNECTED state, the 2G+3G SGSN sends an SRNS Context Request (IMSI) message to the SRNS.
4) Upon reception of the SRNS Context Request message, the SRNS starts buffering and stops sending downlink PDUs to the MS. The SRNS responds with an SRNS Context Response (GTP SNDs, GTP SNUs, PDCP-SNDs, PDCP SNUs) message. The GTP sequence numbers are included for each PDP context indicating the next in-sequence downlink GTP-PDU to be sent to the MS and the next in-sequence GTP PDU to be tunnelled to the GGSN. For each active PDP context, which uses lossless PDCP, the SRNS also includes the uplink PDCP sequence number (PDCP SNU) and the downlink PDCP sequence number (PDCP-SND). PDCP SNU is the PDCP sequence number for the next expected in-sequence uplink packet to be received from the MS. PDCP-SND is the PDCP sequence number for the first downlink packet for which successful transmission has not been confirmed. The 2G+3G SGSN shall strip off the eight most significant bits of the passed PDCP sequence numbers, thus converting them to SNDCP N PDU numbers of the respective 2G GPRS PDP contexts.
3）如果MS是在PMM-CONNECTED狀態(tài)，2G+3G SGSN發(fā)送SRNS Context Request(IMSI)消息給SRNS。
4) 一旦接收到SRNS Context Request消息,SRNS開始緩存并且停止發(fā)送下行PDU給MS。SRNS響應(yīng)一個SRNS Context Response(GTP SNDs、GTP SNUs、PDCP-SNDs、PDCP SNUs）消息。每個PDP上下文都包含了GTP序列號來指示序列中將要發(fā)送給MS的下一個下行GTP-PDU，以及序列中下一個將要發(fā)送給GGSN被封 裝進隧道的GTP PDU。對每一個active的PDP上下文，如使用了無損PDCP，SRNS也應(yīng)包含上行的PDCP序列號(PDCP SNU即Sequence Number Uplink)以及下行PDCP序列號(PDCP-SND即Sequence Number Downlink)。PDCP SNU是一個PDCP序列號，表示的是下一個期望的從MS接收的有序的上行數(shù)據(jù)報文。PDCP-SND是一個PDCP序列號，表示的是第一個成功傳遞但還 沒有被確認的下行數(shù)據(jù)包。2G+3G SGSN應(yīng)提取已經(jīng)傳遞的PDCP序列號的八位最高有效位，將之轉(zhuǎn)換為在2G GPRS PDP上下文中相應(yīng)的SNDCP N PDU的值。
5) Security functions may be executed.
5）安全功能可以被執(zhí)行。
6) If the MS is PMM CONNECTED, the 2G+3G SGSN sends an SRNS Data Forward Command (RAB ID, Transport Layer Address, Iu Transport Association) message to the SRNS. This informs the SRNS that the 2G+3G SGSN is ready to receive data packets. Upon reception of SRNS Data Forward Command message from the 2G+3G SGSN the SRNS shall start the data-forwarding timer.
6a)If Direct Tunnel was established in Iu mode the SGSN sends Update PDP Context Request to the GGSN(s) concerned to establish the GTP tunnel between SGSN and GGSN. The GGSN(s) update the address for User Plane and downlink TEID for data and return an Update PDP Context Response. Otherwise, if there were changes of for example the RAT type that e.g. can be used for charging, the SGSN sends Update PDP Context Request (SGSN Address and TEID, QoS Negotiated, RAT type) message to the GGSN.
6)如果MS是PMM-CONNECTED狀 態(tài)，2G+3G SGSN發(fā)送SRNS Data Forward Command(RAB ID,傳輸層地址、Iu傳輸關(guān)聯(lián)）消息給SRNS。這將通知SRNS，2G+3G SGSN已經(jīng)準備好接收數(shù)據(jù)報文。一旦從2G+3G SGSN接收到這個消息，SRNS應(yīng)開始啟動數(shù)據(jù)轉(zhuǎn)發(fā)計時器。
6a） 如果在Iu模式建立了直接隧道，SGSN發(fā)送Update PDP Context Request給關(guān)聯(lián)的GGSN，來建立在SGSN和GGSN之間的GTP隧道。GGSN更新用戶面地址和下行數(shù)據(jù)的TEID并返回Update PDP Context Response消息。除此以外，如果有別的變化，如RAT類型的變化需要用于計費目的，SGSN發(fā)送Update PDP Context Request(SGSN地址和TEID、協(xié)商的QOS、RAT類型）消息給GGSN。
7) For each RAB indicated by the SRNS Data Forward Command the SRNS starts duplicating and tunnelling the buffered GTP-PDUs back to the 2G+3G SGSN. For each radio bearer which uses lossless PDCP the GTP-PDUs related to transmitted but not yet acknowledged PDCP PDUs are duplicated and tunnelled back to the 2G+3G SGSN together with their related downlink PDCP sequence numbers. The 2G+3G SGSN converts the PDCP sequence numbers to SNDCP sequence number (by stripping off the eight most significant bits of the PDCP sequence numbers).
7） 由SRNS Data Forward Command指明的每一個RAB，SRNS開始將緩存的GTP-PDU復(fù)制并且封入隧道發(fā)給2G+3G SGSN。對使用了無損PDCP壓縮的每一個無線承載，相關(guān)的已經(jīng)傳輸?shù)�沒有得到確認的GTP-PDU，PDCP PDU將被復(fù)制并且和他們相關(guān)聯(lián)的PDCP序列號一起通過隧道回傳給2G+3G SGSN。2G+3G SGSN將把PDCP序列號轉(zhuǎn)換為SNDCP序列號(通過去除PDCP序列號的最高8位）。
8) The 2G+3G SGSN sends an Iu Release Command message to the SRNS. When the RNC data-forwarding timer has expired, the SRNS responds with an Iu Release Complete message.
8）2G+3G SGSN發(fā)送Iu Release Command消息給SRNS。當RNC轉(zhuǎn)發(fā)數(shù)據(jù)計時器超時，SRNS響應(yīng)一個Iu Release Complete消息。
9) If the association has to be established i.e. if Update Type indicates combined RA / LA update with IMSI attach requested, or if the LA changed with the routeing area update, then the 2G+3G SGSN sends a Location Update Request (new LAI, IMSI, SGSN Number, Location Update Type) to the VLR. Location Update Type shall indicate IMSI attach if Update Type in step 1 indicated combined RA / LA update with IMSI attach requested. Otherwise, Location Update Type shall indicate normal location update. When the SGSN does not provide functionality for the Intra Domain Connection of RAN Nodes to Multiple CN Nodes, the VLR number is derived from the RAI. When the SGSN provides functionality for Intra Domain Connection of RAN Nodes to Multiple CN Nodes, the SGSN uses the RAI and a hash value from the IMSI to determine the VLR number. The VLR creates or updates the association with the 2G+3G SGSN by storing the SGSN Number.
9）如果關(guān)聯(lián)需要建立，也就是更新類型指示 了帶有IMSI附著的聯(lián)合的RA/LAU請求，或在RAU時發(fā)生了LA的變化，那么2G+3G SGSN發(fā)送Location Update Request(新LAI、IMSI、SGSN編號、Location Update Type)給VLR。Location Update Type應(yīng)指示為IMSI附著---如果在步驟1的更新類型指示的是帶有IMSI附著請求的聯(lián)合RA/LAU。除此以外，Location Update Type應(yīng)指示為一個正常的Location Update。當SGSN不為多個CN節(jié)點提供到RAN節(jié)點的域內(nèi)連接功能的話，VLR編號將從RAI獲取。當SGSN提供這個功能時，SGSN使用 RAI以及從IMSI得到的一個哈希函數(shù)來決定VLR編號。VLR通過存儲SGSN編號來創(chuàng)建或更新與2G+3G SGSN的關(guān)聯(lián)。
10) If the subscriber data in the VLR is marked as not confirmed by the HLR, the new VLR informs the HLR. The HLR cancels the data in the old VLR and inserts subscriber data in the new VLR:
a) The new VLR sends an Update Location (new VLR) to the HLR.
b) The HLR cancels the data in the old VLR by sending Cancel Location (IMSI) to the old VLR.
c) The old VLR acknowledges with Cancel Location Ack (IMSI).
d) The HLR sends Insert Subscriber Data (IMSI, subscriber data) to the new VLR.
e) The new VLR acknowledges with Insert Subscriber Data Ack (IMSI).
f) The HLR responds with Update Location Ack (IMSI) to the new VLR.
10)如果VLR上的簽約數(shù)據(jù)標記為未得到HLR的確認，則new VLR要通知HLR。HLR取消在old VLR上的數(shù)據(jù)并在new VLR插入新的用戶簽約數(shù)據(jù)：
a）new VLR發(fā)送update location(new VLR)給HLR。
b) HLR發(fā)送cancel location(IMSI)消息給old VLR來取消其上的數(shù)據(jù)。
c）old VLR發(fā)送cancel location ack（IMSI)進行確認。
d）HLR發(fā)送插入簽約用戶數(shù)據(jù)(IMSI,簽約數(shù)據(jù)）給new VLR。
e）new VLR發(fā)送insert subscriber data ack(IMSI)進行確認。
f）HLR發(fā)送update location ack（IMSI）給new VLR進行響應(yīng)。
11) The new VLR allocates a new VLR TMSI and responds with Location Update Accept (VLR TMSI) to the 2G+3G SGSN. VLR TMSI is optional if the VLR has not changed.
12) The 2G+3G SGSN validates the MS's presence in the new RA. If due to roaming restrictions or access restrictions the MS is not allowed to be attached in the RA, or if subscription checking fails, the 2G+3G SGSN rejects the routeing area update with an appropriate cause. If all checks are successful, the 2G+3G SGSN updates MM and PDP contexts for the MS. A new P TMSI may be allocated. A logical link is established between the new 2G+3G SGSN and the MS. 2G+3G-SGSN initiates the establishment procedure. A Routeing Area Update Accept (P TMSI, P TMSI Signature, Receive N PDU Number (= converted PDCP SNU), IMS voice over PS Session Supported Indication) message is returned to the MS. Receive N PDU Number contains the acknowledgements for each NSAPI which used lossless PDCP before the start of the update procedure, thereby confirming all mobile-originated N PDUs successfully transferred before the start of the update procedure. If Receive N PDU Number confirms the reception of N PDUs, these N PDUs shall be discarded by the MS. The IMS voice over PS Session Supported Indication is set as described in clause 5.3.8.
11）new VLR分配一個新的VLR TMSI并且響應(yīng)location update accept(VLR TMSI)給2G+3G SGSN。VLR TMSI是可選的，如果VLR沒有發(fā)生變化的話。
12）2G+3G SGSN驗證在新RA中MS的存在性。如果因為漫游限制或接入限制，MS不允許附著到RA，或者如果簽約檢查失敗，則2G+3G SGSN拒絕RAU并給出原因值。如果所有檢查都成功，2G+3G SGSN更新MS的MM和PDP上下文。一個新的P-TMSI將被分配。一條邏輯鏈路將在new 2G+3G SGSN和MS之間建立。2G+3G SGSN發(fā)起建立流程。一個RAU accept(P-TMSI、P-TMSI簽名、Receive N-PDU Number（=轉(zhuǎn)換的PDCP SNU)，IMS voice over PS會話指示指示）消息將返回給MS。Receive N-PDU Number包含了在更新流程開始之前，使用了無損PDCP的對每個NSAPI的確認，因此確認了在開始更新流程之前所有MS發(fā)起的成功傳遞的N- PDU。如果Receive N-PDU Number確認了對N-PDU的接收，那些N-PDU應(yīng)被MS丟棄。IMS voice over PS會話指示指示根據(jù)5.3.8章節(jié)描述設(shè)置。
13) The MS acknowledges the new P TMSI by returning a Routeing Area Update Complete (Receive N PDU Number) message to the SGSN. Receive N PDU Number (= converted PDCP SND) contains the acknowledgements for each NSAPI which used lossless PDCP before the start of the update procedure, thereby confirming all mobile-terminated N PDUs successfully transferred before the start of the update procedure. If Receive N PDU Number confirms the reception of N PDUs, these N PDUs shall be discarded by the 2G+3G-SGSN.The MS deducts Receive N PDU Number from PDCP SND by stripping off the eight most significant bits. PDCP SND is the PDCP sequence number for the next expected in-sequence downlink packet to be received in the MS per radio bearer, which used lossless PDCP. The new 2G-SGSN negotiates with the MS for each NSAPI the use of acknowledged or unacknowledged SNDCP regardless whether the SRNS used lossless PDCP or not.
14) The 2G+3G SGSN sends a TMSI Reallocation Complete message to the VLR if the MS confirms the VLR TMSI.
15) The 2G+3G SGSN and the BSS may execute the BSS Packet Flow Context procedure.
13)MS 返回RAU Complete(Receive N-PDU Number）消息給SGSN來確認對新P-TMSI的分配。Receive N-PDU Number（=轉(zhuǎn)換的PDCP SND）包含了更新流程開始之前，使用了無損PDCP的對每個NSAPI的確認，因此確認了在開始更新流程之前所有MS接收的成功傳遞的N-PDU。如果 Receive N-PDU Number確認了對N-PDU的接收，那些N-PDU應(yīng)被2G+3G SGSN丟棄。MS通過剝離PDCP SND的高8位有效位來得到Receive N-PDU Number。PDCP SND是一個PDCP序列號，用于標識在每個無線承載上，下一個期望在MS上收到的使用了無損PDCP的下行數(shù)據(jù)報文。New 2G-SGSN和MS為每個NSAPI協(xié)商使用確認或非確認SNDCP，而不管之前SRNS是否使用PDCP或沒有使用。
14）2G+3G SGSN發(fā)送TMSI Reallocation Complete消息給VLR---如果MS確認了VLR TMSI的話。
15）2G+3G SGSN以及BSS可執(zhí)行BSS Packet Flow Context流程。
6.13.1 Intra SGSN Intersystem Change
An SGSN that supports both the Gb and Iu PS interfaces may support an intra-SGSN intersystem change if the radio access technology nodes serving the MS before and after the intersystem change are both served by this SGSN.
一個同時支持Gb和Iu PS接口的SGSN可以支持一個intra-SGSN的系統(tǒng)間改變---當之前和之后為MS提供服務(wù)的無線接入技術(shù)節(jié)點由同一個SGSN服務(wù)的時候。
6.13.1.1 Iu mode to A/Gb mode Intra SGSN Change
6.13.1.1.1 Iu mode to A/Gb mode Intra SGSN Change using Gn/Gp
The intersystem change from Iu mode to A/Gb mode takes place when an MS changes from UTRAN or GERAN Iu mode to A/Gb mode. Depending on the PMM state before the intersystem change and whether the RA is changed or not, one of the following procedures is initiated by the MS:
- When an MS in PMM IDLE state changes to the A/Gb mode without changing the RA, the MS shall follow the selective RA update procedures, see clause "Selective RA Update".
- When an MS in PMM IDLE state changes to the A/Gb mode and the RA changes, the MS shall initiate the GPRS RA update procedure, see clause "Intra SGSN Routeing Area Update".
- When an MS in PMM CONNECTED state changes to the A/Gb mode, the MS shall initiate the GPRS RA update procedure independent of whether the RA has changed or not. The RA update procedure is either combined RA / LA update or only RA update.
從Iu模式到A/Gb模式的系統(tǒng)間改變，是在MS發(fā)生了從UTRAN或GERAN Iu模式到A/Gb模式的改變時產(chǎn)生的。根據(jù)在系統(tǒng)間改變發(fā)生之前的PMM狀態(tài)以及RA是否改變，以下流程之一將由MS發(fā)起：
- 當MS在PMM-IDLE狀態(tài)變更到A/Gb模式并且沒改變RA,MS應(yīng)執(zhí)行選擇性的RAU流程，參考章節(jié)“選擇性RA更新”。
- 當MS在PMM-IDLE狀態(tài)變更到A/Gb模式并且RA改變了，MS應(yīng)發(fā)起GPRS RAU流程，參考章節(jié)“Intra SGSN RAU".
- 當MS在PMM-CONNECTED狀態(tài)變更到A/Gb模式,不管有沒有發(fā)生RA變化,MS都應(yīng)發(fā)起一個GPRS RAU流程.這個RAU流程或者是一個聯(lián)合的RA/LAU,或者只是一個RAU.
A combined RA / LA update takes place in network operation mode I when the MS enters a new RA or when a GPRS-attached MS performs IMSI attach. The MS sends a Routeing Area Update Request message indicating that an LA update may also need to be performed, in which case the SGSN forwards the LA update to the VLR. This concerns only idle mode (see TS 23.122 [7b]), as no combined RA / LA updates are performed during a CS connection. In the context of this specification, the terms RNS or RNC refer also to a GERAN BSS or BSC (respectively) when serving an MS in Iu mode.
一 個聯(lián)合的RA/LAU發(fā)生在網(wǎng)絡(luò)操作模式I---并且當MS進入了一個新的RA或當一個GPRS附著的MS執(zhí)行了IMSI附著.MS發(fā)送RAU Request消息指示這是一個LAU可能也需要執(zhí)行,SGSN轉(zhuǎn)發(fā)LAU給VLR.這僅和idle模式有關(guān)(參考TS23.122),因為在一個CS連 接期間沒有聯(lián)合的RA/LAU被執(zhí)行.本規(guī)范中上下文的描述中,RNS或RNC的術(shù)語也可以相應(yīng)參考GERAN BSS或BSC---當為一個Iu模式的MS服務(wù)時.
Figure 52: Iu mode to A/Gb mode Intra SGSN Change
NOTE: All steps in figure 52 are common for architecture variants using Gn/Gp based interaction with a GGSN and using S4 based interactions with an S GW and P GW. For S4 based interaction with an S GW and P GW, procedure step (A) is defined in clause 6.13.1.1.2.
注釋：在圖例52中的所有步驟對于使用Gn/Gp接口和GGSN交互，還是使用S4接口和SGW/PGW交互的架構(gòu)的都是公共的�；赟4接口和SGW/PGW的交互的步驟A，參考章節(jié)6.13.1.1.2。
1) The MS or RAN decides to perform an intersystem change which makes the MS switch to a new cell where A/Gb mode has to be used, and stops transmission to the network.
2) The MS sends a Routeing Area Update Request (old RAI, old P TMSI Signature, Update Type, Voice domain preference and UE's usage setting) message to the 2G+3G SGSN. Update Type shall indicate RA update or combined RA / LA-update or, if the MS wants to perform an IMSI attach, combined RA / LA update with IMSI attached requested. The BSS shall add the Cell Global Identity including the RAC and LAC of the cell where the message was received before passing the message to the 2G+3G SGSN. The UE sets the voice domain preference and UE's usage setting according to its configuration, as described in clause 5.3.15.
If there is an ongoing emergency bearer service and a Routing Area Update Request is received the Routing Area Update shall be rejected with a cause code indicating that access to GERAN is not allowed.
1）MS或RAN決定執(zhí)行一個系統(tǒng)間改變，使得MS能切換到一個新的A/Gb模式下的小區(qū)，并且停止傳遞數(shù)據(jù)到網(wǎng)絡(luò)。
2）MS 發(fā)送RAU請求（old RAI、old P-TMSI簽名、更新類型、語音域優(yōu)先級和UE的使用設(shè)置）消息給2G+3G SGSN。更新類型應(yīng)指明這個一個RAU或是一個聯(lián)合的RA/LAY或者，如果MS想執(zhí)行一個IMSI的附著、帶有IMSI附著請求的聯(lián)合的RA /LAU。BSS應(yīng)加入CGI（小區(qū)全球標識）并包括小區(qū)的RAC和LAC到這個接收的消息中，然后再傳遞給2G+3G SGSN。UE根據(jù)它自己的配置，按照章節(jié)5.3.15的描述，來設(shè)置語音域優(yōu)先級和它的使用設(shè)置。
3) If the MS is PMM CONNECTED state, the 2G+3G SGSN sends an SRNS Context Request (IMSI) message to the SRNS.
4) Upon reception of the SRNS Context Request message, the SRNS starts buffering and stops sending downlink PDUs to the MS. The SRNS responds with an SRNS Context Response (GTP SNDs, GTP SNUs, PDCP-SNDs, PDCP SNUs) message. The GTP sequence numbers are included for each PDP context indicating the next in-sequence downlink GTP-PDU to be sent to the MS and the next in-sequence GTP PDU to be tunnelled to the GGSN. For each active PDP context, which uses lossless PDCP, the SRNS also includes the uplink PDCP sequence number (PDCP SNU) and the downlink PDCP sequence number (PDCP-SND). PDCP SNU is the PDCP sequence number for the next expected in-sequence uplink packet to be received from the MS. PDCP-SND is the PDCP sequence number for the first downlink packet for which successful transmission has not been confirmed. The 2G+3G SGSN shall strip off the eight most significant bits of the passed PDCP sequence numbers, thus converting them to SNDCP N PDU numbers of the respective 2G GPRS PDP contexts.
3）如果MS是在PMM-CONNECTED狀態(tài)，2G+3G SGSN發(fā)送SRNS Context Request(IMSI)消息給SRNS。
4) 一旦接收到SRNS Context Request消息,SRNS開始緩存并且停止發(fā)送下行PDU給MS。SRNS響應(yīng)一個SRNS Context Response(GTP SNDs、GTP SNUs、PDCP-SNDs、PDCP SNUs）消息。每個PDP上下文都包含了GTP序列號來指示序列中將要發(fā)送給MS的下一個下行GTP-PDU，以及序列中下一個將要發(fā)送給GGSN被封 裝進隧道的GTP PDU。對每一個active的PDP上下文，如使用了無損PDCP，SRNS也應(yīng)包含上行的PDCP序列號(PDCP SNU即Sequence Number Uplink)以及下行PDCP序列號(PDCP-SND即Sequence Number Downlink)。PDCP SNU是一個PDCP序列號，表示的是下一個期望的從MS接收的有序的上行數(shù)據(jù)報文。PDCP-SND是一個PDCP序列號，表示的是第一個成功傳遞但還 沒有被確認的下行數(shù)據(jù)包。2G+3G SGSN應(yīng)提取已經(jīng)傳遞的PDCP序列號的八位最高有效位，將之轉(zhuǎn)換為在2G GPRS PDP上下文中相應(yīng)的SNDCP N PDU的值。
5) Security functions may be executed.
5）安全功能可以被執(zhí)行。
6) If the MS is PMM CONNECTED, the 2G+3G SGSN sends an SRNS Data Forward Command (RAB ID, Transport Layer Address, Iu Transport Association) message to the SRNS. This informs the SRNS that the 2G+3G SGSN is ready to receive data packets. Upon reception of SRNS Data Forward Command message from the 2G+3G SGSN the SRNS shall start the data-forwarding timer.
6a)If Direct Tunnel was established in Iu mode the SGSN sends Update PDP Context Request to the GGSN(s) concerned to establish the GTP tunnel between SGSN and GGSN. The GGSN(s) update the address for User Plane and downlink TEID for data and return an Update PDP Context Response. Otherwise, if there were changes of for example the RAT type that e.g. can be used for charging, the SGSN sends Update PDP Context Request (SGSN Address and TEID, QoS Negotiated, RAT type) message to the GGSN.
6)如果MS是PMM-CONNECTED狀 態(tài)，2G+3G SGSN發(fā)送SRNS Data Forward Command(RAB ID,傳輸層地址、Iu傳輸關(guān)聯(lián)）消息給SRNS。這將通知SRNS，2G+3G SGSN已經(jīng)準備好接收數(shù)據(jù)報文。一旦從2G+3G SGSN接收到這個消息，SRNS應(yīng)開始啟動數(shù)據(jù)轉(zhuǎn)發(fā)計時器。
6a） 如果在Iu模式建立了直接隧道，SGSN發(fā)送Update PDP Context Request給關(guān)聯(lián)的GGSN，來建立在SGSN和GGSN之間的GTP隧道。GGSN更新用戶面地址和下行數(shù)據(jù)的TEID并返回Update PDP Context Response消息。除此以外，如果有別的變化，如RAT類型的變化需要用于計費目的，SGSN發(fā)送Update PDP Context Request(SGSN地址和TEID、協(xié)商的QOS、RAT類型）消息給GGSN。
7) For each RAB indicated by the SRNS Data Forward Command the SRNS starts duplicating and tunnelling the buffered GTP-PDUs back to the 2G+3G SGSN. For each radio bearer which uses lossless PDCP the GTP-PDUs related to transmitted but not yet acknowledged PDCP PDUs are duplicated and tunnelled back to the 2G+3G SGSN together with their related downlink PDCP sequence numbers. The 2G+3G SGSN converts the PDCP sequence numbers to SNDCP sequence number (by stripping off the eight most significant bits of the PDCP sequence numbers).
7） 由SRNS Data Forward Command指明的每一個RAB，SRNS開始將緩存的GTP-PDU復(fù)制并且封入隧道發(fā)給2G+3G SGSN。對使用了無損PDCP壓縮的每一個無線承載，相關(guān)的已經(jīng)傳輸?shù)�沒有得到確認的GTP-PDU，PDCP PDU將被復(fù)制并且和他們相關(guān)聯(lián)的PDCP序列號一起通過隧道回傳給2G+3G SGSN。2G+3G SGSN將把PDCP序列號轉(zhuǎn)換為SNDCP序列號(通過去除PDCP序列號的最高8位）。
8) The 2G+3G SGSN sends an Iu Release Command message to the SRNS. When the RNC data-forwarding timer has expired, the SRNS responds with an Iu Release Complete message.
8）2G+3G SGSN發(fā)送Iu Release Command消息給SRNS。當RNC轉(zhuǎn)發(fā)數(shù)據(jù)計時器超時，SRNS響應(yīng)一個Iu Release Complete消息。
9) If the association has to be established i.e. if Update Type indicates combined RA / LA update with IMSI attach requested, or if the LA changed with the routeing area update, then the 2G+3G SGSN sends a Location Update Request (new LAI, IMSI, SGSN Number, Location Update Type) to the VLR. Location Update Type shall indicate IMSI attach if Update Type in step 1 indicated combined RA / LA update with IMSI attach requested. Otherwise, Location Update Type shall indicate normal location update. When the SGSN does not provide functionality for the Intra Domain Connection of RAN Nodes to Multiple CN Nodes, the VLR number is derived from the RAI. When the SGSN provides functionality for Intra Domain Connection of RAN Nodes to Multiple CN Nodes, the SGSN uses the RAI and a hash value from the IMSI to determine the VLR number. The VLR creates or updates the association with the 2G+3G SGSN by storing the SGSN Number.
9）如果關(guān)聯(lián)需要建立，也就是更新類型指示 了帶有IMSI附著的聯(lián)合的RA/LAU請求，或在RAU時發(fā)生了LA的變化，那么2G+3G SGSN發(fā)送Location Update Request(新LAI、IMSI、SGSN編號、Location Update Type)給VLR。Location Update Type應(yīng)指示為IMSI附著---如果在步驟1的更新類型指示的是帶有IMSI附著請求的聯(lián)合RA/LAU。除此以外，Location Update Type應(yīng)指示為一個正常的Location Update。當SGSN不為多個CN節(jié)點提供到RAN節(jié)點的域內(nèi)連接功能的話，VLR編號將從RAI獲取。當SGSN提供這個功能時，SGSN使用 RAI以及從IMSI得到的一個哈希函數(shù)來決定VLR編號。VLR通過存儲SGSN編號來創(chuàng)建或更新與2G+3G SGSN的關(guān)聯(lián)。
10) If the subscriber data in the VLR is marked as not confirmed by the HLR, the new VLR informs the HLR. The HLR cancels the data in the old VLR and inserts subscriber data in the new VLR:
a) The new VLR sends an Update Location (new VLR) to the HLR.
b) The HLR cancels the data in the old VLR by sending Cancel Location (IMSI) to the old VLR.
c) The old VLR acknowledges with Cancel Location Ack (IMSI).
d) The HLR sends Insert Subscriber Data (IMSI, subscriber data) to the new VLR.
e) The new VLR acknowledges with Insert Subscriber Data Ack (IMSI).
f) The HLR responds with Update Location Ack (IMSI) to the new VLR.
10)如果VLR上的簽約數(shù)據(jù)標記為未得到HLR的確認，則new VLR要通知HLR。HLR取消在old VLR上的數(shù)據(jù)并在new VLR插入新的用戶簽約數(shù)據(jù)：
a）new VLR發(fā)送update location(new VLR)給HLR。
b) HLR發(fā)送cancel location(IMSI)消息給old VLR來取消其上的數(shù)據(jù)。
c）old VLR發(fā)送cancel location ack（IMSI)進行確認。
d）HLR發(fā)送插入簽約用戶數(shù)據(jù)(IMSI,簽約數(shù)據(jù)）給new VLR。
e）new VLR發(fā)送insert subscriber data ack(IMSI)進行確認。
f）HLR發(fā)送update location ack（IMSI）給new VLR進行響應(yīng)。
11) The new VLR allocates a new VLR TMSI and responds with Location Update Accept (VLR TMSI) to the 2G+3G SGSN. VLR TMSI is optional if the VLR has not changed.
12) The 2G+3G SGSN validates the MS's presence in the new RA. If due to roaming restrictions or access restrictions the MS is not allowed to be attached in the RA, or if subscription checking fails, the 2G+3G SGSN rejects the routeing area update with an appropriate cause. If all checks are successful, the 2G+3G SGSN updates MM and PDP contexts for the MS. A new P TMSI may be allocated. A logical link is established between the new 2G+3G SGSN and the MS. 2G+3G-SGSN initiates the establishment procedure. A Routeing Area Update Accept (P TMSI, P TMSI Signature, Receive N PDU Number (= converted PDCP SNU), IMS voice over PS Session Supported Indication) message is returned to the MS. Receive N PDU Number contains the acknowledgements for each NSAPI which used lossless PDCP before the start of the update procedure, thereby confirming all mobile-originated N PDUs successfully transferred before the start of the update procedure. If Receive N PDU Number confirms the reception of N PDUs, these N PDUs shall be discarded by the MS. The IMS voice over PS Session Supported Indication is set as described in clause 5.3.8.
11）new VLR分配一個新的VLR TMSI并且響應(yīng)location update accept(VLR TMSI)給2G+3G SGSN。VLR TMSI是可選的，如果VLR沒有發(fā)生變化的話。
12）2G+3G SGSN驗證在新RA中MS的存在性。如果因為漫游限制或接入限制，MS不允許附著到RA，或者如果簽約檢查失敗，則2G+3G SGSN拒絕RAU并給出原因值。如果所有檢查都成功，2G+3G SGSN更新MS的MM和PDP上下文。一個新的P-TMSI將被分配。一條邏輯鏈路將在new 2G+3G SGSN和MS之間建立。2G+3G SGSN發(fā)起建立流程。一個RAU accept(P-TMSI、P-TMSI簽名、Receive N-PDU Number（=轉(zhuǎn)換的PDCP SNU)，IMS voice over PS會話指示指示）消息將返回給MS。Receive N-PDU Number包含了在更新流程開始之前，使用了無損PDCP的對每個NSAPI的確認，因此確認了在開始更新流程之前所有MS發(fā)起的成功傳遞的N- PDU。如果Receive N-PDU Number確認了對N-PDU的接收，那些N-PDU應(yīng)被MS丟棄。IMS voice over PS會話指示指示根據(jù)5.3.8章節(jié)描述設(shè)置。
13) The MS acknowledges the new P TMSI by returning a Routeing Area Update Complete (Receive N PDU Number) message to the SGSN. Receive N PDU Number (= converted PDCP SND) contains the acknowledgements for each NSAPI which used lossless PDCP before the start of the update procedure, thereby confirming all mobile-terminated N PDUs successfully transferred before the start of the update procedure. If Receive N PDU Number confirms the reception of N PDUs, these N PDUs shall be discarded by the 2G+3G-SGSN.The MS deducts Receive N PDU Number from PDCP SND by stripping off the eight most significant bits. PDCP SND is the PDCP sequence number for the next expected in-sequence downlink packet to be received in the MS per radio bearer, which used lossless PDCP. The new 2G-SGSN negotiates with the MS for each NSAPI the use of acknowledged or unacknowledged SNDCP regardless whether the SRNS used lossless PDCP or not.
14) The 2G+3G SGSN sends a TMSI Reallocation Complete message to the VLR if the MS confirms the VLR TMSI.
15) The 2G+3G SGSN and the BSS may execute the BSS Packet Flow Context procedure.
13)MS 返回RAU Complete(Receive N-PDU Number）消息給SGSN來確認對新P-TMSI的分配。Receive N-PDU Number（=轉(zhuǎn)換的PDCP SND）包含了更新流程開始之前，使用了無損PDCP的對每個NSAPI的確認，因此確認了在開始更新流程之前所有MS接收的成功傳遞的N-PDU。如果 Receive N-PDU Number確認了對N-PDU的接收，那些N-PDU應(yīng)被2G+3G SGSN丟棄。MS通過剝離PDCP SND的高8位有效位來得到Receive N-PDU Number。PDCP SND是一個PDCP序列號，用于標識在每個無線承載上，下一個期望在MS上收到的使用了無損PDCP的下行數(shù)據(jù)報文。New 2G-SGSN和MS為每個NSAPI協(xié)商使用確認或非確認SNDCP，而不管之前SRNS是否使用PDCP或沒有使用。
14）2G+3G SGSN發(fā)送TMSI Reallocation Complete消息給VLR---如果MS確認了VLR TMSI的話。
15）2G+3G SGSN以及BSS可執(zhí)行BSS Packet Flow Context流程。
回答者：
OscarDon
回答時間：2013-05-15 14:08
36
35
簡單來說LAU或者RAU過程就向CS或PS域核心網(wǎng)說明UE在該域中，并取得使用該域資源的權(quán)利。
LAU過程分為開機登記注冊、周期性位置更新以及正常位置更新（位置區(qū)發(fā)生變更）；
RAU過程分為周期性的和正常的路由區(qū)更新（路由區(qū)發(fā)生變更）。
LAU過程分為開機登記注冊、周期性位置更新以及正常位置更新（位置區(qū)發(fā)生變更）；
RAU過程分為周期性的和正常的路由區(qū)更新（路由區(qū)發(fā)生變更）。
回答者：
marinelick
回答時間：2013-05-24 13:37
36
27
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需求人數(shù)：2 人 地點：九江市
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需求人數(shù)：10 人 地點：寧夏
• 河南創(chuàng)賽通信科技有限公司 聘：人事招聘咨詢專員
需求人數(shù)：53 人 地點：鄭州市
• 河北中創(chuàng)盈和通信科技有限公司 聘：中級前臺/寧夏中衛(wèi)
需求人數(shù)：2 人 地點：寧夏
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需求人數(shù)：1 人 地點：莆田市
• 福州弘宇信合通信技術(shù)有限公司 聘：“1+N項目”高級網(wǎng)優(yōu)工程師
需求人數(shù)：1 人 地點：清遠市
• 嘉環(huán)科技股份有限公司 聘：湖南電信原廠優(yōu)化招聘
需求人數(shù)：10 人 地點：長沙市,永州市,郴州市,衡陽市
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