CN1816206A - Method for repositioning between support nodes in service general group wireless business - Google Patents
Method for repositioning between support nodes in service general group wireless business Download PDFInfo
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Abstract
The method includes following steps: (1) after negotiation between mobile subscriber (MS) and access network decides to launch relocation, source wireless network controller sends request to former SGSN to launch procedure of relocation; (2) former SGSN sends request message of forwarding relocation including international mobile station ID (IMSI), packet temporary mobile station ID (P-TMSI), and route area ID (RAI) to new SGSN; new SGSN own builds and saves received IMSI or P-TMSI, and context of MS with RAI being as index; (3)carrying out next flow of relocation between SGSNs right along. In the invention, after relocation is ended, when Iu connection is abnormal released, new SGSN can obtain context of MS through P-TMSI + RAI in procedure for updating route area so as to prevent MS data service from interruption.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) wireless communication technology, relate in particular to the method for relocating between service universal grouping wireless support node (SGSN).
Background technology
In the WCDMA system, each legal contracted user all has a unique international mobile subscriber identify label (IMSI) and identifies its identity, and this IMSI information is the permanent identification of mobile subscriber (MS).Yet; consider that from the angle of network security user identity is important and responsive information, for the permanent identification IMSI that prevents the user is illegally stolen and follows the tracks of in wireless access network; must in communication, guarantee the confidentiality of IMSI information, and then protection user's privacy.Therefore, be exposed to for a long time for fear of user's IMSI information and eat dishes without rice or wine, wireless network distributes interim identify label for each user.For packet domain, wireless network identifies packet domain mobile subscriber identifier sign (P-TMSI) and differentiates and differentiate the user as temporary identity.Particularly, P-TMSI is that the SGSN of core net distributes to the temporary identity sign of MS in packet domain, and in order to protect the confidentiality of user identity, SGSN carries out irregular renewal to P-TMSI.In addition, P-TMSI has local characteristic, promptly P-TMSI only when being assigned with the route district at this MS place effective.Obscure during for fear of use P-TMSI, wireless network also combines Routing Area Identifier (RAI) with P-TMSI, realize MS of unique sign.
The MS of SGSN identification for convenience, 3GPP agreement regulation, in the initial signaling message of each signaling process, all carry permanent identification or the temporary identity sign of MS, for example: can comprise IMSI or P-TMSI in the Attach Request message, can only carry P-TMSI information in Routing Area Update request, detach request and the service request information.
When MS and wireless network carry out the transmission of up-downgoing signaling, must set up being connected of a carrying subscriber signaling message between radio network controller (RNC) and the SGSN, because this connection builds on the Iu interface, therefore be called Iu on the agreement and connect, each Iu connection all uses an Iu hyphen to identify.When no longer transmitting signaling message, Iu connects and can be discharged by corresponding RNC and SGSN.
When MS initiated a signaling process, if RNC is not connected for this MS distributes Iu with SGSN before this, SGSN just discerned this MS by the identify label of carrying in the signaling process start message that comes from MS.In addition, after receiving the start message of this signaling process, SGSN is connected for the user distributes an Iu with RNC, and the follow-up signaling message of this MS just transmits in this Iu connection.Because SGSN is when distributing Iu to connect, set up this Iu hyphen and with the corresponding relation of this MS, even then follow-up all message that transmit in this Iu connection all do not comprise user's identify label, SGSN can be known the MS of these message correspondences by the Iu hyphen.
The regulation that is connected with Iu about User Identity in the above-mentioned 3GPP agreement is equally applicable to reorientation (Relocation) flow process between SGSN.Reorientation between so-called SGSN is meant, MS is when carrying out transfer of data, the RNC that causes this MS to insert owing to the change of its position changes, if the RNC that is inserted before and after changing belongs to two different SGSN respectively, the RNC after then changing this moment is repositioned onto process on the new SGSN with the transfer of data of this MS.
As shown in Figure 1, the reorientation between SGSN may further comprise the steps:
Step 101. is owing to the position change of MS, and MS and Access Network are after consulting, and reorientation (Decision to perform SRNS relocation) is initiated in decision, so that MS switches RNC.
Step 102. source RNC sends re-positioning request (Relocation Required) message to former SGSN, and the sign of carrying the type, reason and source RNC and the Target RNC that show this Relocation in this message, and repositioning process is initiated in request.
The former SGSN of step 103. determines new SGSN according to the RELOCATION REQUEST message that receives, and the IMSI of this MS is carried in forward pass re-positioning request (the Forward Relocation Request) message, sends to new SGSN; New SGSN sets up and preserves the context of this MS according to the forward pass re-positioning request that receives at self.
In this step, former SGSN is according to source RNC in the RELOCATION REQUEST message that receives and Target RNC sign, know that Target RNC and source RNC do not belong to same SGSN administration, illustrate that this reorientation is a repositioning process between the SGSN, then send the forward pass RELOCATION REQUEST message to new SGSN.According to 3GPP agreement regulation, the forward pass RELOCATION REQUEST message adopts form as shown in table 1.
| Cell (Information element) | Occur requiring (Presence requirement) |
| International mobile subscriber identify label (IMSI) | Essential |
| Chain of command tunnel end sign (Tunnel Endpoint Identifier Control Plane) | Essential |
| Wireless access network applying portion reason (RANAP Cause) | Essential |
| RAB context (RAB Context) | Condition is optional |
| Charging property (Charging Characteristics) | Optional |
| Mobile management context (MM Context) | Essential |
| Block data protocol context (PDP Context) | Condition is optional |
| SGSN control plane address (SGSN Address for Control plane) | Essential |
| Target identification (Target Identification) | Essential |
| UMTS Terrestrial radio access network transparent vessel (UTRAN transparent container) | Essential |
| Privately owned expansion (Private Extension) | Optional |
Table 1
New SGSN is after receiving the forward pass RELOCATION REQUEST message, according to the context of the foundation of the IMSI in this message at this MS, preserve information such as mobile management context in the forward pass RELOCATION REQUEST message and PDP Context in this context, and in follow-up flow process, can IMSI information be the context that indexed search is set up in this step to new SGSN.
The new SGSN in step 104～106. sends re-positioning request (RelocationRequest) order to Target RNC, requires Target RNC to set up to be used to transmit the RAB (Establishment of Radio Access Bearers) of the data service of this MS; After Target RNC is finished allocation of radio resources, return re-positioning request to new SGSN and reply (Relocation Request Acknowledge) message; Between Target RNC and new SGSN, distribute an Iu interface signaling to connect simultaneously, be used to transmit the up-downgoing signaling message of this MS.
The new SGSN of step 107. sends forward pass relocation response (Forward RelocationResponse) message to former SGSN, indicate re-positioning request and assign, and taken back RAB (RAB) information of Target RNC distribution for former SGSN to Target RNC.
After the former SGSN in step 108～113. receives the forward pass relocation response message, issue reorientation order (Relocation Command) message to source RNC, the source RNC of requirement begins to switch to Target RNC; Then, source RNC begins to send forward data (Forward of data) to Target RNC, reorientation is submitted to beginning (Relocation Commit) message to send to Target RNC again; Target RNC sends reorientation to new SGSN and surveys (Relocation Detect) message after receiving that beginning message is submitted in reorientation to, indicates Access Network and has finished switching; Then, Target RNC and MS confirm (UTRAN Mobility Information Confirm) by UTRAN mobile station information (UTRAN Mobility Information) message and UTRAN mobile station information message are carried out intercommunication, so that MS and network side exchange message.
Step 114～115. are owing to the reorientation that has taken place between SGSN, and therefore new SGSN is by upgrading PDP Context request (Update PDP Context Request) message informing critical point GPRS Support Node (GGSN) renewal PDP Context; GGSN sends renewal PDP Context response (Update PDP Context Response) message to new SGSN after finishing renewal.
Step 116～120. when Target RNC finish with MS mutual after, finish the new SGSN of (Relocation Complete) message informing with reorientation again; New SGSN sends the forward pass reorientation to former SGSN again and finishes (Forward Relocation Complete) message, indicates reorientation and finishes; Then, former SGSN returns the forward pass reorientation to new SGSN and finishes and reply (Forward Relocation CompleteAcknowledge) message, confirms to have received that reorientation finishes message; Then, former SGSN connects by the Iu that Iu release command (Iu Release Command) notification source RNC discharges this MS, and source RNC returns Iu release to former SGSN again and finishes (Iu Release Complete) message.
So far, the reorientation between SGSN is finished.
New SGSN only comprises mobile management context and PDP Context in the context of the MS that above-mentioned steps 103 is set up, and does not have the subscription data of MS.And subscription data must just can be inserted among the new SGSN through the Routing Area Update flow process by attaching position register (HLR), therefore after repositioning process finishes, must carry out the Routing Area Update flow process, otherwise new SGSN can be released to this MS context distributed and related resource, and then causes user data service to interrupt.Then, have only this MS to activate the transmission of PDP ability restore data business again.
As shown in Figure 2, the Routing Area Update flow process after the reorientation mainly may further comprise the steps between SGSN:
Step 201.MS carries the P-IMSI of this MS and Routing Area Update request (the Routing AreaUpdate Request) message of corresponding RAI information by UMTS Terrestrial radio access network (UTRAN) to new SGSN transmission, initiates Routing Area Update; New SGSN according to the Iu hyphen of this Routing Area Update request message of carrying, self is searching corresponding context again.
The new SGSN of step 202. carries out corresponding security process according to the system configuration of network side.
In this step, if operator has disposed authentication and encryption to network side, then new SGSN carries out corresponding authentication and ciphering process to MS; If operator has only disposed authentication or encryption, then new SGSN carries out corresponding authentication or encryption to MS; If operator does not dispose any security process, then new SGSN does not carry out any operation.
The new SGSN of step 203. gets access to the IMSI of this MS from the context that finds, and this IMSI is carried in position renewal (Update Location) message, sends to HLR.
Step 204～205.HLR is determined subscription data and the former SGSN of this MS according to the IMSI that receives, and nullifies (Cancel Location) message by the position that transmission carries IMSI, notifies former SGSN to delete the subscription data of this MS; After former SGSN finishes the deletion of subscription data, reply (Cancel Location Ack) message to the cancellation of HLR home position.
Insertion subscription data (Insert SubscriberData) message of step 206～208.HLR by including IMSI is inserted the subscription data of this MS to new SGSN; New SGSN finds corresponding context according to IMSI information, and the context that will come from HLR is inserted in this context, and returns the insertion subscription data to HLR and reply (Insert Subscriber Data Ack) message; HLR sends the position renewal to new SGSN again and replys (Update Location Ack) message.
The new SGSN in step 209～210. issues Routing Area Update to MS and accepts (Routing Area Update Accept) message after receiving that acknowledge message is upgraded in the position of HLR, and wherein carrying new SGSN is the newly assigned P-TMSI of this MS; MS returns Routing Area Update to new SGSN and finishes (RoutingArea Update Complete) message, and expression has received that above-mentioned Routing Area Update accepts message, and confirms to accept the P-TMSI that new SGSN redistributes.
So far, the Routing Area Update after the reorientation is finished between SGSN.
According to the regulation of agreement, MS necessarily remains with Iu between Target RNC and the new SGSN and connects when having taken place to carry out Routing Area Update after the reorientation between SGSN, so that MS connects by this Iu, uploads the Routing Area Update request message to new SGSN.And, new SGSN can above-mentioned again step 201 in according to Iu hyphen and the contextual mapping relations of this MS, navigate to the context of the MS that self preserves, thereby proceed follow-up Routing Area Update, to guarantee the normal transmission of data service.But unusual owing to what can occur eating dishes without rice or wine in real world applications, then after reorientation finished, Target RNC have initiatively discharged the Iu that sets up and has connected in repositioning process.After this, when Target RNC is received the Routing Area Update request message that comes from this MS, can for redistributing the Iu signaling, this MS connect with new SGSN.Then, the Routing Area Update request message of this MS just connects by newly assigned Iu and is delivered on the new SGSN by Target RNC.
Yet, above-mentioned newly assigned Iu hyphen not and set up the mapping corresponding relation between the context of this MS that is preserved among the new SGSN, therefore new SGSN can't navigate to according to the Iu hyphen and be user's context distributed before this.In addition, new SGSN is that what comprise in the MS context distributed is to come from the IMSI information of carrying in the forward pass re-positioning request of former SGSN of this MS, promptly has only the context that can find this MS correspondence by IMSI, and in the Routing Area Update request message, just carried this MS P-TMSI at this moment and its corresponding RAI, therefore can't find corresponding context.Generally speaking, eating dishes without rice or wine unusual after the reorientation Iu that has set up is connected under the d/d situation, after new SGSN receives the Routing Area Update request message, can't navigate to the MS context in himself, handle thereby cause new SGSN that this MS is considered as a new user who comes from other SGSN roamings.And the context that new SGSN sets up for this MS in the reorientation flow process before this then can finally cause the phenomenon of the data service generation interruption of this MS owing to the Routing Area Update request message of not receiving expectation by overtime release.After this, if the restore data business, this MS must activate PDP Context again.
Summary of the invention
In view of this, the object of the present invention is to provide the method for reorientation between a kind of SGSN, Iu connects under the unusual situation about discharging after reorientation finishes, and reduces the probability that interruption takes place in the Routing Area Update process in the MS data service.
For achieving the above object, the invention provides the method for reorientation between a kind of SGSN, this method may further comprise the steps:
A. mobile subscriber MS and Access Network are after reorientation is initiated in consult to decide, and source radio network controller RNC initiates repositioning process to former SGSN request;
B. former SGSN will carry described mobile subscriber's international mobile subscriber identify label IMSI, packet domain mobile subscriber identifier sign P-TMSI and the forward pass RELOCATION REQUEST message of Routing Area Identifier RAI, send to new SGSN, new SGSN is according to the forward pass re-positioning request that receives, and is the context of the described MS of index self setting up and preserve with IMSI or P-TMSI and RAI;
C. proceed the follow-up flow process of reorientation between SGSN.
Further comprise in the described forward pass RELOCATION REQUEST message of step B:
Mobile management context and block data protocol context;
The described new SGSN of step B is that the contextual method of index is self setting up and preserve with IMSI or P-TMSI and RAI:
IMSI, P-TMSI, RAI, mobile management context and the block data protocol context that new SGSN will get access to from described forward pass RELOCATION REQUEST message formed the context of described MS, and preserves at self.
The described forward pass RELOCATION REQUEST message of step B further comprises:
Chain of command tunnel end sign, wireless access network applying portion reason, RAB context, SGSN control plane address, target identification, UMTS Terrestrial radio access network transparent vessel and privately owned expansion.
Described step C may further comprise the steps:
C1. target SGSN sends the re-positioning request order to the Target RNC sign, Target RNC is replied and is finished message by return re-positioning request to new SGSN, simultaneously, Target RNC and new SGSN distribute an Iu interface signaling that is used to transmit the up-downgoing signaling message of this MS to be connected;
C2. new SGSN sends the forward pass relocation response message to former SGSN, and for former SGSN has taken back the RAB information that Target RNC distributes, former SGSN issues the reorientation command messages to source RNC;
C3. source RNC begins to send forward data to Target RNC, again reorientation is submitted to beginning message to send to Target RNC, Target RNC sends the reorientation probe message to new SGSN, and then, Target RNC and MS carry out intercommunication by UTRAN mobile station information message and UTRAN mobile station information acknowledge message;
C4. new SGSN is by update packet data protocol contexts request message notice critical point GPRS Support Node GGSN update packet data protocol contexts, and GGSN sends update packet data protocol contexts response message to new SGSN after finishing renewal;
C5. Target RNC finish and MS between mutual after, finish the new SGSN of message informing with reorientation, new SGSN sends the forward pass reorientation to former SGSN again and finishes message, then, former SGSN returns the forward pass reorientation to new SGSN and finishes response message, confirms to have received that reorientation finishes message, then, former SGSN connects by the Iu that Iu release command notification source RNC discharges this MS, and source RNC returns the Iu Release complete to former SGSN again.
After described step C, this method further comprises:
D1.MS carries the P-IMSI of this MS and the Routing Area Update request message of corresponding RAI information by UMTS Terrestrial radio access network to new SGSN transmission, initiate Routing Area Update, new SGSN is again according to P-IMSI that receives and corresponding RAI information, at the context of self searching described MS correspondence;
D2.MS, UMTS Terrestrial radio access network, new SGSN, former SGSN and attaching position register HLR match, and finish follow-up Routing Area Update flow process.
The described new SGSN of step D1 according to P-IMSI that receives and corresponding RAI information in the contextual method of self searching described MS correspondence is:
New SGSN compares the P-TMSI that received and corresponding RAI respectively with P-TMSI and RAI in the context of self preserving, if both are all consistent, judge that then this context is the context of described MS; Otherwise, judge that this context is not the context of described MS.
After described step D1, this method further comprises:
New SGSN carries out corresponding security process according to the system configuration of network side.
Described step D2 may further comprise the steps:
D21. new SGSN gets access to the IMSI of this MS from the context that finds, and this IMSI is carried in the location update message, sends to HLR;
D22.HLR carries the position logout message of IMSI by transmission, and the subscription data of notifying former SGSN to delete this MS after former SGSN finishes the deletion of subscription data, is nullified response message to the HLR home position;
D23.HLR is by including the insertion subscription data message of IMSI, insert the subscription data of this MS to new SGSN, then, new SGSN finds corresponding context according to IMSI information, the context that will come from HLR is inserted in this context, and return to HLR and to insert the subscription data response message, HLR sends position update response information to new SGSN again;
D24. after new SGSN receives that acknowledge message is upgraded in the position of HLR, issue Routing Area Update to MS and accept message, for this MS redistributes P-TMSI, MS returns Routing Area Update to new SGSN again and finishes message, expression has received that above-mentioned Routing Area Update accepts message, and confirms to have accepted the P-TMSI that new SGSN redistributes.
Use the present invention, between SGSN in the repositioning process, former SGSN sends to new SGSN by the forward pass re-positioning request with IMSI, the P-TMSI of MS and the RAI information of correspondence, the context that new SGSN is index for MS foundation with IMSI and two kinds of information of P-TMSI+RAI again, so that finishing back Iu, reorientation connects under the situation about being discharged unusually, new SGSN can find the context of MS by P-TMSI+RAI in the Routing Area Update process, thereby continue to finish follow-up Routing Area Update flow process, avoided the interruption of MS data service in the Routing Area Update process.
Description of drawings
Fig. 1 is the signaling process figure of method for relocating between existing SGSN;
Fig. 2 is the signaling process figure of existing routing region updating method;
Fig. 3 is the signaling process figure of method for relocating between SGSN of the present invention;
Fig. 4 is the signaling process figure of routing region updating method of the present invention.
Embodiment
For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The present invention is the method for reorientation between a kind of SGSN, and its basic thought is: MS and Access Network are through negotiation and after determining to initiate reorientation, and source RNC initiates repositioning process by sending RELOCATION REQUEST message to former SGSN request; Then, former SGSN will carry the forward pass RELOCATION REQUEST message of IMSI, P-TMSI and the RAI of this MS, send to new SGSN, and new SGSN sets up and preserve the context of this MS according to the forward pass re-positioning request that receives at self; Then, proceed reorientation flow process between SGSN.
Below be the embodiment that thought according to the present invention is carried out reorientation between SGSN:
As shown in Figure 3, the method for reorientation may further comprise the steps between the SGSN in the embodiment of the invention:
Step 301～302.MS and Access Network are through negotiation and after determining to initiate reorientation, and source RNC initiates repositioning process by sending RELOCATION REQUEST message to former SGSN request.
In the RELOCATION REQUEST message that former SGSN sends, indicated the sign of type, reason and source RNC and the Target RNC of Relocation this time at source RNC, so that start the corresponding subsequent flow process.
Step 101 among above-mentioned steps and Fig. 1 and 102 operation and describe identical.
The former SGSN of step 303. determines new SGSN according to the RELOCATION REQUEST message that receives, and information such as IMSI, the P-TMSI of this MS and RAI are carried in the forward pass RELOCATION REQUEST message, sends to new SGSN; New SGSN is according to the forward pass re-positioning request that receives, and self setting up and preserving the context that is paired into this MS of index with IMSI and P-TMSI and RAI.
In this step, former SGSN is according to source RNC in the RELOCATION REQUEST message and Target RNC sign, know that Target RNC and source RNC do not belong to same SGSN administration, show that this reorientation is a repositioning process between the SGSN, therefore send the forward pass RELOCATION REQUEST message to new SGSN.The forward pass RELOCATION REQUEST message adopts form as shown in table 2 in this step.
| Cell (Information element) | Occur requiring (Presence requirement) |
| International mobile subscriber identify label (IMSI) | Essential |
| Routing Area Identifier (RAI) | Optional |
| Packet domain temporary identity sign (P-TMSI) | Optional |
| Chain of command tunnel end sign (Tunnel Endpoint Identifier Control Plane) | Essential |
| Wireless access network applying portion reason (RANAP Cause) | Essential |
| RAB context (RAB Context) | Condition is optional |
| Charging property (Charging Characteristics) | Optional |
| Mobile management context (MM Context) | Essential |
| Block data protocol context (PDP Context) | Condition is optional |
| SGSN control plane address (SGSN Address for Control plane) | Essential |
| Target identification (Target Identification) | Essential |
| UMTS Terrestrial radio access network transparent vessel (UTRAN transparent container) | Essential |
| Privately owned expansion (Private Extension) | Optional |
Table 2
Compared as seen by table 1 and table 2, the forward pass RELOCATION REQUEST message of present embodiment has increased RAI and two cells of P-TMSI than the forward pass RELOCATION REQUEST message of agreement regulation.Because P-TMSI is dynamic change, so the present invention is by increasing the P-TMSI cell in the forward pass RELOCATION REQUEST message, and the P-TMSI of this MS informs new SGSN with this moment; Again because the local characteristic of P-TMSI so present embodiment has increased the RAI cell in the forward pass RELOCATION REQUEST message, so that combine with P-TMSI, realizes the purpose of unique identification MS.Therefore,, can get access to the current P-TMSI of this MS, so that be that the context of after this setting up this MS is prepared by the forward pass RELOCATION REQUEST message of present embodiment.
New SGSN is after receiving this forward pass RELOCATION REQUEST message, according to wherein the IMSI and the P-TMSI and the RAI of pairing, foundation is at the context of this MS, be the context that information such as IMSI, P-TMSI, RAI, mobile management context and PDP Context that new SGSN will get access to from the forward pass RELOCATION REQUEST message are formed this MS, and preserve at self.In follow-up flow process, can be index with the information such as combination of IMSI or P-TMSI and RAI, retrieve the context that new SGSN sets up in this step.
Step 304～320.MS, source RNC, Target RNC, former SGSN, new SGSN and GGSN match, and finish the reorientation between SGSN.
New SGSN according to the forward pass RELOCATION REQUEST message behind the context of self setting up this MS, entities such as MS, source RNC, Target RNC, former SGSN, new SGSN and GGSN are carried out the follow-up signaling transmission of reorientation between SGSN according to the regulation of 3GPP agreement.Step 104 among the operation of above-mentioned steps and description and Fig. 1 is to 120 identical.
So far, the reorientation between the SGSN in the embodiment of the invention is finished.
As shown in Figure 4, after the reorientation between above-mentioned SGSN was finished, the Routing Area Update flow process that MS initiates may further comprise the steps:
Step 401.MS carries the P-IMSI of this MS and Routing Area Update request (the Routing Area Update Request) message of corresponding RAI information by UTRAN to new SGSN transmission, initiates Routing Area Update; New SGSN is again according to P-IMSI that receives and corresponding RAI information, at the context of self searching this MS correspondence.
Because between SGSN before this in the reorientation flow process, can obtain by P-TMSI and RAI retrieval with the corresponding context of MS among the new SGSN, therefore in this step, after new SGSN receives the Routing Area Update request message that MS sends, no longer rely on carrying Iu hyphen and obtain context, but retrieve as index with P-IMSI and corresponding RAI information.
This step is retrieved contextual concrete grammar: new SGSN compares the P-TMSI that received and corresponding RAI respectively with P-TMSI and RAI in the context of self preserving, if both are all consistent, judge that then this context is the context of described MS; Otherwise, judge that this context is not the context of described MS.
The new SGSN of step 402. carries out corresponding security process according to the system configuration of network side.
In this step, if operator has disposed authentication and encryption to network side, then new SGSN carries out corresponding authentication and ciphering process to MS; If operator has only disposed authentication or encryption, then new SGSN carries out corresponding authentication or encryption to MS; If operator does not dispose any security process, then new SGSN does not carry out any operation.Step 202 among operation of this step and description and Fig. 2 is identical.
Step 403～410.MS, UTRAN, new SGSN, former SGSN and HLR match, and finish follow-up Routing Area Update flow process.
At this moment, new SGSN at first gets access to the IMSI of this MS from the context that finds, and this IMSI is carried in the location update message, sends to HLR; Then, HLR carries the position logout message of IMSI by transmission, and the subscription data of notifying former SGSN to delete this MS after former SGSN finishes the deletion of subscription data, is nullified response message to the HLR home position; HLR by including the insertion subscription data message of IMSI, inserts the subscription data of this MS again to new SGSN; New SGSN finds corresponding context according to IMSI information, and the context that will come from HLR is inserted in this context, and returns insertion subscription data response message to HLR; HLR sends position update response information to new SGSN again; At last, after new SGSN receives that acknowledge message is upgraded in the position of HLR, issue Routing Area Update to MS and accept message, for this MS redistributes P-TMSI, MS returns Routing Area Update to new SGSN and finishes message, expression has received that above-mentioned Routing Area Update accepts message, and confirms to accept the P-TMSI that new SGSN redistributes.
The operation of above-mentioned steps 403 to 410 and the step 203 among description and Fig. 2 are to 210 identical.
So far, in the present embodiment between SGSN the Routing Area Update process after the reorientation finish.
Because in the reorientation flow process between SGSN, new SGSN is according to the forward pass RELOCATION REQUEST message of being received, at the context that self to have set up with IMSI or two kinds of information of P-TMSI+RAI be index, then new SGSN is P-TMSI and the corresponding RAI information by carrying in the Routing Area Update request message in this step, at the context that self retrieves this MS.As seen, the contextual method of searching MS in the present embodiment step 401 does not rely on the Iu hyphen that the Routing Area Update request of new SGSN is sent in carrying.In other words, the Iu that sets up in the repositioning process connects owing to after unusual being released of eating dishes without rice or wine, in the Routing Area Update flow process, rebulid under the situation of Iu connection, though there are not mapping relations in the context among newly-established Iu connection and the new SGSN, but new SGSN still can be by P-TMSI in the Routing Area Update request message and corresponding RAI information, find the context of this MS, and subscription data is inserted in the above-mentioned context by the HLR under this MS.This kind method can be avoided the context among the new SGSN and by overtime release, finally not cause the phenomenon of the data service generation interruption of this MS owing to receive the Routing Area Update request message of expectation.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, the method for relocating between a kind of service universal grouping wireless support node SGSN is characterized in that this method may further comprise the steps:
A. mobile subscriber MS and Access Network are after reorientation is initiated in consult to decide, and source radio network controller RNC initiates repositioning process to former SGSN request;
B. former SGSN will carry described mobile subscriber's international mobile subscriber identify label IMSI, packet domain mobile subscriber identifier sign P-TMSI and the forward pass RELOCATION REQUEST message of Routing Area Identifier RAI, send to new SGSN, new SGSN is according to the forward pass re-positioning request that receives, and is the context of the described MS of index self setting up and preserve with IMSI or P-TMSI and RAI;
C. proceed the follow-up flow process of reorientation between SGSN.
2, the method for claim 1 is characterized in that, further comprises in the described forward pass RELOCATION REQUEST message of step B:
Mobile management context and block data protocol context;
The described new SGSN of step B is that the contextual method of index is self setting up and preserve with IMSI or P-TMSI and RAI:
IMSI, P-TMSI, RAI, mobile management context and the block data protocol context that new SGSN will get access to from described forward pass RELOCATION REQUEST message formed the context of described MS, and preserves at self.
3, method as claimed in claim 2 is characterized in that, the described forward pass RELOCATION REQUEST message of step B further comprises:
Chain of command tunnel end sign, wireless access network applying portion reason, RAB context, SGSN control plane address, target identification, UMTS Terrestrial radio access network transparent vessel and privately owned expansion.
4, the method for claim 1 is characterized in that, described step C may further comprise the steps:
C1. target SGSN sends the re-positioning request order to the Target RNC sign, Target RNC is replied and is finished message by return re-positioning request to new SGSN, simultaneously, Target RNC and new SGSN distribute an Iu interface signaling that is used to transmit the up-downgoing signaling message of this MS to be connected;
C2. new SGSN sends the forward pass relocation response message to former SGSN, and for former SGSN has taken back the RAB information that Target RNC distributes, former SGSN issues the reorientation command messages to source RNC;
C3. source RNC begins to send forward data to Target RNC, again reorientation is submitted to beginning message to send to Target RNC, Target RNC sends the reorientation probe message to new SGSN, and then, Target RNC and MS carry out intercommunication by UTRAN mobile station information message and UTRAN mobile station information acknowledge message;
C4. new SGSN is by update packet data protocol contexts request message notice critical point GPRS Support Node GGSN update packet data protocol contexts, and GGSN sends update packet data protocol contexts response message to new SGSN after finishing renewal;
C5. Target RNC finish and MS between mutual after, finish the new SGSN of message informing with reorientation, new SGSN sends the forward pass reorientation to former SGSN again and finishes message, then, former SGSN returns the forward pass reorientation to new SGSN and finishes response message, then, former SGSN connects by the Iu that Iu release command notification source RNC discharges this MS, and source RNC returns the Iu Release complete to former SGSN again.
As each described method of claim 1 to 4, it is characterized in that 5, after described step C, this method further comprises:
D1.MS carries the P-IMSI of this MS and the Routing Area Update request message of corresponding RAI information by UMTS Terrestrial radio access network to new SGSN transmission, initiate Routing Area Update, new SGSN is again according to P-IMSI that receives and corresponding RAI information, at the context of self searching described MS correspondence;
D2.MS, UMTS Terrestrial radio access network, new SGSN, former SGSN and attaching position register HLR match, and finish follow-up Routing Area Update flow process.
6, method as claimed in claim 5 is characterized in that, the described new SGSN of step D1 according to P-IMSI that receives and corresponding RAI information in the contextual method of self searching described MS correspondence is:
New SGSN compares the P-TMSI that received and corresponding RAI respectively with P-TMSI and RAI in the context of self preserving, if both are all consistent, judge that then this context is the context of described MS; Otherwise, judge that this context is not the context of described MS.
7, method as claimed in claim 5 is characterized in that, after described step D1, this method further comprises:
New SGSN carries out corresponding security process according to the system configuration of network side.
8, method as claimed in claim 5 is characterized in that, described step D2 may further comprise the steps:
D21. new SGSN gets access to the IMSI of this MS from the context that finds, and this IMSI is carried in the location update message, sends to HLR;
D22.HLR carries the position logout message of IMSI by transmission, and the subscription data of notifying former SGSN to delete this MS after former SGSN finishes the deletion of subscription data, is nullified response message to the HLR home position;
D23.HLR is by including the insertion subscription data message of IMSI, insert the subscription data of this MS to new SGSN, then, new SGSN finds corresponding context according to IMSI information, the context that will come from HLR is inserted in this context, and return to HLR and to insert the subscription data response message, HLR sends position update response information to new SGSN again;
D24. after new SGSN receives that acknowledge message is upgraded in the position of HLR, issue Routing Area Update to MS and accept message, for this MS redistributes P-TMSI, MS returns Routing Area Update to new SGSN again and finishes message, expression has received that above-mentioned Routing Area Update accepts message, and confirms to have accepted the P-TMSI that new SGSN redistributes.
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