CN102858008B

CN102858008B - Direct tunnel mobility management method and system as well as network elements

Info

Publication number: CN102858008B
Application number: CN201110176703.6A
Authority: CN
Inventors: 沈炯
Original assignee: ZTE Corp
Current assignee: Jiangsu Yanzong Industry Investment Development Co.,Ltd.
Priority date: 2011-06-28
Filing date: 2011-06-28
Publication date: 2017-04-12
Anticipated expiration: 2031-06-28
Also published as: WO2013000289A1; CN102858008A

Abstract

The invention relates to a direct tunnel mobility management method and system as well as network elements. In the scene that a terminal moves, the method comprises the steps that a target radio network controller (RNC) sends a downlink endpoint identity (EID) tunnel address allocated to the terminal by the target RNC to a new gateway general packet radio service (GPRS) support node (GGSN) via a new serving GPRS support node (SGSN) and an original GGSN in sequence; and the new GGSN allocates the uplink EID tunnel address to the terminal and sends the uplink EID tunnel address to the target RNC via the original GGSN and the new SGSN in sequence. By adopting the method, the system and the network elements, the problem of alternative route is solved on the basis of implementing the direct tunnel.

Description

The motion management method of direct tunnel, network element and system

Technical field

The present invention relates to mobile communication technology field, more particularly to a kind of motion management method of direct tunnel, network element (including Serving GPRS Support Node (SGSN) and Gateway GPRS Support Node (GGSN)) and system.

Background technology

Existing WCDMA (Wideband Code Division Multiple Access, referred to as WCDMA) System is to be currently based on important system and method that wireless WCDMA technologies realize service access.The core net framework of WCDMA is as schemed Shown in 1, including service GPRS (General Packet Radio Service, general packet radio service) node (Serving GPRS Support Node, referred to as SGSN), critical point GPRS nodes (Gateway GPRS Support Node, referred to as GGSN) and the home subscriber signing network element such as depositor, the homing position in 2G (Generation Mobile Telecommunication System technology) is posted herein Home subscriber server (Home Subscriber in storage (Home Location Register, referred to as HLR) and 3G Server, referred to as HSS) home subscriber signing depositor is referred to as, represented with HLR/HSS.Due to existing TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) core network Using with WCDMA same architectures, following WCDMA system refers to WCDMA and TD-SCDMA.

SGSN is a basic composition network element of GPRS network, is to provide for gprs service and in global system for mobile telecommunications The new net introduced in system (Globle System for Mobile Communication, referred to as GSM) network Element device.Mainly complete the routing forwarding of packet data package, mobile management, session management, Logical Link Management, authentication and add The function such as close.

GGSN provides data message and nets the route between inner and outer portion's data network and encapsulation in WCDMA, plays gateway effect, it Adhere to the routing iinformation of user including PS, routing iinformation is used for the current attachment point data message tunnel to MS, i.e. SGSN.

HLR/HSS is used to store the packet domain subscription data and routing iinformation of user.

RNC is radio network controller (Radio Network Controller), is the ingredient of wireless access network, For providing mobile management, call treatment, url management and handover mechanism.3GPP23.060R7 versions and after, introduce Direct tunnel (direct tunnel) technology, can directly set up media surface tunnel, medium surface data between RNC and GGSN Without again through SGSN forwardings.

Node B are base station (radio receiving-transmitting units), are communicated with UE by Uu interfaces.

One key property of mobile network is that the seriality that business is still kept during terminal is persistently moved is received and dispatched, Here it is handoff functionality.For WCDMA core nets, handoff functionality is in reorientation flow process and 2G, 3G intersystem handover Realize, reorientation flow process is discussed herein primarily, be not related to 2G, 3G intersystem handover problem.

Reorientation flow process complete access path that user makes data in core net during using business datum with Terminal location changes and changes, so as to ensure the seriality of business.Reorientation flow process is most complicated in mobile communication core net Flow process.It is related to data forwarding, the function of routing update.

Reorientation flow process is divided into by the scene for occurring：

- SRNS Serving Radio Network Subsystem (Service Radio Network Subsystem, SRNS) reorientation；

- united direct-cut operation and SRNS reorientations；

- cell/URA (UTRAN Registration Area, UTRAN registration areas) associated update and SRNS reorientations；

- Routing Area Update；

- SRNS reorientations are cancelled.

Service SRNS repositioning process

Service SRNS repositioning process is only in PMM-CONNECTED (packet domain mobile management-connection) in MS (terminal) Perform during state, Iur interfaces are used to transmit control signaling and user data.

Service SRNS repositioning process is used in UTRAN ((Universal Terrestrial Radio Access Network, UMTS wireless access network) side, from one " fixed resting position ", UTRAN moves to from source RNC to Target RNC CN junction points.In this process, Iu links are reorientations.If Target RNC is connected to same with what source RNC was connected On SGSN, then the internal repositioning process of SGSNSRNS (SRNS Serving Radio Network Subsystem) is performed, and the process does not do SGSN switchings. Otherwise, if Target RNC is connected on different SGSN from source RNC, the service SRNS reorientations for doing SGSN handoff scenarios are needed Journey.

Fig. 2 a show source RNC (Serving RNC) and Target RNC is connected to the repositioning of RNC when on different SGSN.Figure 2b show SRNS repositioning process and Routing Area Update process after the completion of situation.

After service SRNS repositioning process and RA (Routing Area, Route Area) update, MS is registered in new SGSN, MS PMM-CONNECTED states are in for new SGSN, Target RNC will be used as Serving RNC.

Service SRNS repositioning process is shown in the explanation (based on the R7 of 3GPP TS 23.060 and later version) of Fig. 3, including weight Positioning set-up procedure, reorientation implementation procedure and reorientation complete process, it is specific as follows：

Step 301：Source RNC determines to initiate SRNS reorientations；

Step 302：Source RNC send reorientation (Relocation Required) message (comprising reorientation type, reason, Source ID, Target id, source RNC to Target RNC Transparent Container etc.) original SGSN is given, initiate reorientation set-up procedure.

Wherein, source includes that necessary information, security functionality and RRC agreements are coordinated in reorientation to Target RNC Transparent Container Contextual information (including UE capacity).

Step 303：Former SGSN is according to Target cell ID, if it is determined that SRNS reorientations are the SRNS reorientations between SGSN, Send " forwarding re-positioning request (Forward Relocation Required) " message and, to new SGSN, initiate reorientation resource Assigning process.

Step 304a：New SGSN sends RELOCATION REQUEST message to Target RNC.

The RELOCATION REQUEST message includes permanent NAS (Non-Access Stratum) UE identifiers (such as international mobile subscriber identity IMSI), reason, CN domains indicator, the transparent vessel of source RNC to Target RNC and the RAB (Radio to be arranged Access Bearer, referred to as RAB) etc..

The user plane IP address and TEID that GGSN is also carried in the request message sets up direct tunnel for RNC and GGSN.

Step 304b：Target RNC receive all necessary resources of RAB including Iu user planes into after the distribution of work, set up with it is new The RAB of SGSN is carried, and is sent re-positioning request and is confirmed (Relocation Request Acknowledge) message to new SGSN；

Step 305：The resource that user data is transmitted between Target RNC and new SGSN is distributed, and new SGSN is After the reorientation of SRNS is ready, new SGSN sends " forwarding relocation response (Forward Relocation Response) " message is to original SGSN；So far, reorientation resource allocation process is successfully terminated.

Step 306：Former SGSN sends and resets order of the bit (Relocation Command) message to new RNC, continues SRNS Reorientation；

Reorientation command messages include：The RAB the to be discharged and RAB restricted by data forwarding.Former SGSN is according to service Quality (Quality of Service, referred to as QoS) determines the RAB by data forwarding restriction.

Step 307：Source RNC is received after reorientation command messages from ps domain, and log-on data repeating timer, source RNC is opened Begin forwarding data.

Data forwarding in SRNS reorientations should be performed by Iu interfaces, it is meant that between source SRNC and Target RNC Data exchange is replicated in the SRNC of source, and is sent to Target RNC in IP layers.

Step 308：When reorientation set-up procedure is by successful termination, and source RNC is ready, and source RNC is by sending " mesh To source RNC transparent vessels, " RRC (wireless heterogeneous networks) message of middle offer triggers the execution of SRNS reorientations to mark RNC to MS.

Above-mentioned RRC information such as can be physical channel reconfiguration message (Physical Channel Reconfiguration), UE information words and CN transparent vessels are carried in message.

Step 309：When reorientation execution triggering is received, Target RNC should send relocation detect-message to new SGSN. When relocation detect-message is sent, Target RNC should start source RNC operations.

Step 310：Target SRNC to source RNC sends RAN mobility informations, including Location Area Identification and route cell mark Know etc., also including the serial number between terminal and SRNC.After receiving this information, terminal starts to send upper line number to Target RNC According to bag.

After terminal completes to reconfigure, send RAN mobility informations to Target RNC and confirm message, it does to notify Target RNC Receive the preparation of downlink data well.

Step 311：Target SRNC initiates reorientation complete process by sending reorientation completion message to new SGSN, wherein Target SRNC address is carried, if direct tunnel mode, target SRNC address medium face ground is carried in reorientation completion message Location, target SRNC media surface tunnel endpoint identifier (TEID).

Step 312：If SRNC reorientations are the reorientations between SGSN, new SGSN sends forwarding reorientation completion message To former SGSN.Former SGSN returns the confirmation of the reorientation completion message to forwarding.

Step 313：If SRNS reorientations are the reorientations between SGSN SRNS, or SRNS reorientations are SGSN SRNS The reorientation of interior use direct tunnel, new SGSN sends and updates PDP (Packet Data Protocol Context, packet Data protocol) context request message (wherein carries new SGSN addresses, SGSN tunnel endpoint identifiers, for the mesh of medium surface Mark RNC addresses, RNCTEID discusses and decides QoS) to correlation GGSN；If direct tunnel mode, on the renewal PDP that new SGSN sends New SGSN control plane addresses, new SGSN chains of command tunnel endpoint identifier, Target RNC address medium are hereafter carried in request message Face address, Target RNC media surface tunnel endpoint identifier and DTI indicate and discuss and decide the relevant informations such as QoS to related GGSN, GGSN updates their PDP Context field, and returns renewal PDP Context response (Update PDP Context Response) message, carries GGSN tunnel endpoint identifiers etc..

Step 314：After receiving forwarding reorientation completion message, former SGSN sends Iu release commands (Iu Release Command) message gives source RNC, and when RNC data forwarding intervalometers expire, source RNC responds an Iu releases and completes (Iu Release Complete) message；

Step 315：MS is completed after re-configuration process, if new Routing Area Identifier is different with former, MS can be initiated Routing Area Update process.

Routing Area Update process is in order to the current positional informationes of MS are registered in into new SGSN, and by new SGSN information updatings To in HLR.The a subset of the RA renewal processes that the Routing Area Update part in this flow process is only carried out, because MS is in PMM- CONNECTED states.

Joint direct-cut operation and SRNS repositioning process

Joint direct-cut operation and SRNS reorientations are used between RNC without Iur interfaces, and the process is only moved in MS in packet domain Perform during dynamic management-connection (PMM-CONNECTED) state.

When joint direct-cut operation and SRNS repositioning process are used to perform the direct-cut operation determined by UTRAN, in UTRAN sides from source UTRAN is moved to CN (core net) junction point by RNC to Target RNC.In this process, Iu links are relocated.If mesh Mark RNC and source RNC is connected on same SGSN, then the repositioning process inside SGSN SRNS is performed.If Target RNC connects The SGSN that the SGSN being connected to is connected to from source RNC is different, then the SRNS repositioning process between SGSN is performed.Perform this process Followed by perform the Routing Area Update process between SGSN.

Cell/URA associated updates and SRNS repositioning process

This process is only that the MS in PMM-CONNECTED states is performed, and here Iur carries control signaling but without use User data.

When cell/URA associated updates and SRNS reorientations are reselected for performing cell in utran, in UTRAN sides UTRAN is moved to into CN junction points from source SRNC to Target RNC.In this process, Iu links are relocated.

Routing Area Update

When the MS of attachment is detected, it has been enter into new RA or periodicity RA updates intervalometer and expires, and need to just carry out Route Area more Newly.

SGSN also manages front RA by finding it, and it is Routing Area Update inside SGSN to detect it.In this case, SGSN has a necessary information of MS, thus need not be new MS position informing GGSN or HLR, so GGSN switchings will not be done, no It is the content of this patent, this patent describes the Routing Area Update between SGSN-spanning.In Routing Area Update between SGSN-spanning, only MS Not in PMM connection status, new SGSN just sends PDP Context and updates request to GGSN, and in PMM connection status, PDP Context is more Change request to complete in service SRNS repositioning process or joint direct-cut operation and SRNS repositioning process.

Routing Area Update flow process is shown in Fig. 4 (based on 3GPP TS 23.060R6 versions), specific as follows：

Step 401, if RRC connections are also not set up, sets up RRC connections.MS sends Routing Area Update request message (P- TMSI, front RAI, front P-TMSI signature, updating type, Follow on Request) arrive new SGSN.

Step 402, if RA renewals are the Routing Area Updates between SGSN, and in PMM-IDLE, (packet domain is moved before MS Dynamic management-idle) state, new SGSN sends SGSN context request messages (front P-TMSI, front RAI, front P-TMSI signature) and arrives Former SGSN, obtains the MM and PDP Context of MS.

Step 402a, former SGSN to source SRNS send SRNS context request messages, and obtain SRNS context requests should Answer.

Step 403, former SGSN to new SGSN sends SGSN context request responses.

Step 404, safe handling function.

Step 405, if it is Routing Area Update between SGSN that RA updates, new SGSN send SGSN contexts confirm message to Former SGSN.

Step 406, former SGSN to source SRNS sends data forwarding order.

Step 407, if in step 402a, source SRNS has the data of caching, then source SRNS forwards data to former SGSN.

Step 408, former SGSN to new SGSN forwards data.

Step 409, if it is Routing Area Update between SGSN that RA updates, and MS is not in PMM connection status, new SGSN to Former GGSN sends and updates PDP Context request (also referred to as PDP Context change request) message, and former GGSN to new SGSN sends PDP Context changes response.

Step 410, if it is that RA between SGSN updates that RA updates, new SGSN by send more new position (SGSN numbers, SGSN addresses, IMSI) HLR is given, the change of SGSN is notified HLR.

Step 411, if RA renewals are the RA between SGSN updated, HLR sends canceling position (Cancel Location) (IMSI cancels type), to original SGSN, former SGSN discharges original Iu resources.

Step 412, if RA renewals are the Routing Area Updates between SGSN, HLR sends insertion user data (IMSI, signing Data) message give new SGSN.

Step 413, if RA renewals are the RA between SGSN updated, HLR is by sending Update Location Ack (IMSI) confirmed to new SGSN.

Step 414 to step 419 is wireless side routing update process.

Industry is currently suggested various new mobile management technologies, and its essential idea is user identity and position separating skill Art.Existing relevant identity and position separating (Subscriber Identifier ＆ Locator in prior art Separation Network, SILSN) solution, it is such as Host Based to realize such as HIP technologies, and based on router Realization such as location identity separated protocol (LISP) technology, the multiple technologies for having correlation again in every kind of realization are supported, these The identity (text in be expressed as AID) of terminal use in scheme does not change in moving process, according to the position of terminal separately Dispensing position identifies (be expressed as RID in text) to realize route and the forwarding of data message.

Fig. 5 shows the network architecture of a kind of identity and position separating (SILSN), and the network of the SILSN frameworks is opened up Flutter and be divided on topological relation access network and backbone network without overlapping, access network is located at the edge of backbone network, is responsible for all ends The access at end, backbone network is responsible for the route of the inter-terminal data message for accessing and forwarding.In network, users of the AID as terminal Identity, remains constant in terminal moving process；RID is the station location marker that network is terminal distribution, in backbone network Use.It should be noted that identity and station location marker can have different titles in different SILSN frameworks, but essence is The same.

In SILSN frameworks, terminal can be one or more in mobile terminal, fixed terminal and roam terminals, such as handss Machine, landline telephone, computer and server etc..

In SILSN frameworks, access network is used to provide two layers (physical layer and link layer) access means, maintenance terminal for terminal Physics access link between ASR.

In SILSN frameworks, the main network elements of backbone network include：

Access service router (Access Service Router, ASR) is the edge router of backbone network, for for Terminal distribution RID, the AID-RID map informations of maintenance terminal, the AID-RID bindings that terminal is registered and inquired about to ILR are closed System, and realize route and forwarding of data message etc..Terminal must access backbone network through ASR.ASR is the RID of terminal distribution Address information comprising the ASR, points in other words this ASR, during using the RID as the destination address of data message, the datagram Text will be routed to the ASR.

Generic router (Common Router, CR), the core router of backbone network, for according in data message RID carries out routing, forwards the data message with RID as purpose address.

Identity position depositor (Identity Location Register, ILR), ILR is used to preserving and safeguarding ownership The identity of user terminal and station location marker map information, are also written as AID-RID map informations in text, process to terminal location Registration, go to register and inquire about；

Alternatively, backbone network can also include：

Interconnection services node (Internet Service Router, ISR), with traditional IP, ASR and ILR Interface, for realizing interconnecting for identity, locator separation network and traditional IP.

As can be seen that ASR needs to be terminal distribution RID when terminal is accessed to realize the normal forwarding of message, and The binding of the AID and RID that need to ILR to register the user, to update ILR in the terminal binding RID.In an example In, ASR is each terminal maintenance terminal to client information (the alternatively referred to as link information of terminal and Correspondent Node, or terminal With the correspondence information of Correspondent Node), wherein the correspondence relationship information comprising terminal AID and its Correspondent Node AID, may be used also With including the AID-RID map informations of the terminal.

WCDMA system can provide the user polytype service application, but there is also much using upper problem, Such as：

GGSN is constant, there is route roundabout.During terminal is in once connection and using business, GGSN keeps constant. So in the case where user is moved, it is possible to move on to apart from GGSN it is far and apart from service source it is relatively near where, so as to Cause path roundabout, cause transmission resource waste, time delay elongated.

Using static publicly-owned address as the IP address of terminal, there can be considerable restraint to the mobility of user.It is static publicly-owned IP address, can only be out from fixed gateway due to due to route planning.Once move to it is far where, it is impossible to regard to proximity Enter external network.Inevitably cause route roundabout, cause transmission resource waste, time delay elongated.

The content of the invention

Present invention solves the technical problem that a kind of motion management method of direct tunnel, network element and system are to provide, with Solve the problems, such as that route is roundabout.

To solve above-mentioned technical problem, the invention provides a kind of motion management method of direct tunnel, sends out in terminal Under raw mobile scene, the method includes：

Target radio network controller (RNC) passes sequentially through new demand servicing GRPS supporting node (SGSN), former gateway GPRS Point (GGSN) of serving as a diplomatic envoy sends the downstream media face tunnel address that Target RNC is the terminal distribution to new GGSN；

The new GGSN be the up media surface tunnel address of terminal distribution, and pass sequentially through the former GGSN, new SGSN to The Target RNC sends the up media surface tunnel address.

Further, Target RNC sends the first message to the new SGSN；

The new SGSN receives the first message, and sends the second message to the former GGSN

The former GGSN receives second message, and sends the 3rd message to the new GGSN；

The new GGSN receives the 3rd message, and in the described first to the 3rd message downstream media face tunnel is carried Track address；

The new GGSN sends the up media surface tunnel ground by the former GGSN, new SGSN to the Target RNC The step of location, including：

The new GGSN to the former GGSN sends the 4th message；

The former GGSN receives the 4th message, and sends the 5th message to the new SGSN；

The new SGSN receives the 5th message and sends the 6th message to the Target RNC；

The up media surface tunnel address is carried in 4th to the 6th message；

Wherein, the described first to the 6th message is existing or newly-increased message.

Further, the first message is reorientation completion message, and second message please to update PDP Context Ask, the 3rd message is PDP Context PUSH message, the 4th message is that PDP Context pushes response message, described the To update PDP Context response, the 6th message is notification message to five message.

Method as claimed in claim 2, it is characterised in that：3rd message also carries the realization switching of the terminal Information needed, the new GGSN switches information needed and distributes the up media surface tunnel address according to the realization of the terminal.

Further, the former GGSN judges whether to need switching after second message is received, and determines to be selected during switching New GGSN is selected, and the 3rd message is sent to the new GGSN for selecting.

To solve above technical problem, present invention also offers a kind of Serving GPRS Support Node (SGSN), the SGSN Include upstream message processing module and downstream message processing module including the SGSN, under the scene that terminal is moved, as During new SGSN：

The upstream message processing module, for receiving the first message of target radio network controller (RNC) transmission, with And the second message is sent to former Gateway GPRS Support Node (GGSN), carry target in the first message and the second message RNC is the downstream media face tunnel address of the terminal distribution；

To solve above technical problem, present invention also offers a kind of Gateway GPRS Support Node (GGSN), the GGSN Including receiver module, address assignment module and sending module, under the scene that terminal is moved：

During as former GGSN, the receiver module, for receiving second message that the new SGSN sends, is additionally operable to Receive the 4th message that new GGSN sends；The sending module, for sending the 3rd message to new GGSN, is additionally operable to new SGSN sends the 5th message；

It is the terminal distribution to carry target radio network controller (RNC) in second message, the 3rd message Downstream media face tunnel address, in the 4th message and the 5th message the up media surface tunnel address is carried；

During as new GGSN, the receiver module is additionally operable to receive the 3rd message that the former GGSN sends；It is described Sending module, is additionally operable to send the 4th message to former GGSN；The address assignment module, for for the terminal distribution institute State up media surface tunnel address.

In addition, present invention also offers a kind of mobility management systems of direct tunnel, the system includes as above Serving GPRS Support Node (SGSN) and Gateway GPRS Support Node (GGSN).

The motion management method of direct tunnel of the present invention, network element and system by certain path realize Target RNC with Between new GGSN the interaction of the media surface tunnel address of information, realizes the mobile management of direct tunnel, it is to avoid route is circuitous Return.

Description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：

Fig. 1 is the Organization Chart of existing WCDMA system packet domain；

Fig. 2 a are to service SRNS reorientations and the schematic diagram before Routing Area Update；

Fig. 2 b are to service SRNS reorientations and the schematic diagram after Routing Area Update；

Fig. 3 is the flow chart of existing SRNS repositioning process；

The flow chart that Tu4Shi existing routes area updates；

Fig. 5 is a kind of schematic diagram of the SILSN network architectures；

Fig. 6 is the schematic diagram of WCDMA core net framework of the present invention with SILSN frameworks；

Fig. 7 is the method flow schematic diagram for servicing SRNS reorientations of the embodiment of the present invention one；

Fig. 8 is the embodiment of the present invention two for united direct-cut operation and the method flow schematic diagram of SRNS reorientations；

Fig. 9 is illustrating for cell/URA associated updates and the method flow of SRNS reorientations for the embodiment of the present invention three Figure；

Figure 10 is the method flow schematic diagram for Routing Area Update of the embodiment of the present invention four；

Figure 11 is the schematic diagram of the motion management method of direct tunnel of the present invention；

Figure 12 is the modular structure schematic diagram of SGSN of the present invention；

Figure 13 is the modular structure schematic diagram of GGSN of the present invention；

Figure 14 is the schematic diagram for realizing system that the present invention sets up direct tunnel.

Specific embodiment

It should be noted that due to TD-SCDMA core network architectures it is consistent with wcdma core network framework, present invention side Case is equally applicable in TD-SCDMA core networks, and described below WCDMA system refers to WCDMA and TD-SCDMA.

As shown in figure 11, the motion management method of direct tunnel of the present invention includes：

Step 111：Descending address transmission step, target radio network controller (RNC) passes sequentially through new demand servicing GRPS It is the descending of the terminal distribution that point (SGSN), original Gateway GPRS Support Node (GGSN) of serving as a diplomatic envoy sends Target RNC to new GGSN Media surface tunnel address；

Specifically, the Target RNC passes sequentially through new SGSN, original GGSN and sends downstream media face tunnel to new GGSN The step of address, including：

Target RNC to the new SGSN sends the first message；

The former GGSN receives second message, and sends the 3rd message to new GGSN；

The new GGSN receives the 3rd message, and in the described first to the 3rd message downstream media face tunnel is carried Track address.

Step 112：Upper row address transmission step, the new GGSN is the up media surface tunnel address of terminal distribution, and according to It is secondary that the up media surface tunnel address is sent to the Target RNC by the former GGSN, new SGSN.

Specifically, the new GGSN sends the up medium surface by the former GGSN, new SGSN to the Target RNC The step of tunnel address, including：

The new GGSN to the former GGSN sends the 4th message；

The up media surface tunnel address is carried in 4th to the 6th message；

Wherein, the aforementioned first to the 6th message is existing or newly-increased message.

Preferably, the 3rd message also carry the terminal realization switching information needed (such as：The IMSI of MS and/or AID, PDP Context information (comprising new SGSN, the address of new RNC and TEID, DTI), the information such as authentication information of MS), it is described New GGSN switches information needed and distributes the up media surface tunnel address according to the realization of the terminal.

In the present invention, it is preferable that former GGSN judges whether to need switching after second message is received, and determines switching When select new GGSN, and send the 3rd message to the new GGSN for selecting.

Chain of command tunnel address described in the present invention includes the control plane address and chain of command endpoint of a tunnel mark of correspondence network element Know (TEID), media surface tunnel address includes the medium surface address of correspondence network element and media surface tunnel Endpoint ID (TEID).

For the ease of illustrating the present invention, make below with reference to enforcement of the drawings and the specific embodiments to technical solution of the present invention Describe in further detail.It should be noted that the feature in embodiment and embodiment in the case where not conflicting, in the application Can mutual combination in any.

Hereinafter, the invention provides one kind uses in a wcdma system identity position separation architecture, in handoff procedure The motion management method of the identity of terminal and the WCDMA core nets of position separating is supported, to avoid route roundabout.Specifically For, be by above-mentioned SILSN framework applications in WCDMA system come realize without fixed anchor point switch.It should be noted that using SILSN frameworks are intended merely to illustrate embodiments of the invention, and the flow process of the present invention is also widely portable to other identity positions Put separation architecture.

The SILSN frameworks and its operation principle recorded according to background technology will be seen that terminal movement occurs cutting across ASR When changing, the new ASR for cutting side will be terminal distribution RID, and message and decapsulation that encapsulation MS sends are sent to the message of MS；Cut out The former ASR of side will delete the AID-RID map informations of the terminal, be sent to the message of MS to new ASR.Meanwhile, new ASR or Former ASR needs to update AID-RID mapping relations of the MS in ILR, also, if ASR, ISR use AID-RID mapped caches at this Ground, it is desirable to have AID-RID mappings are changed notice ASR, ISR by a kind of mechanism.

A kind of framework of the WCDMA core nets with SILSN frameworks is shown in Fig. 6：

GGSN is used as the function of ASR, has interface S1, interface S1 to be used for the RID to ILR query communications opposite end between ILR, Registration, change, AID-RID mapping relations of deletion MS etc..

There are signaling interface S2 and data-interface D2, signaling interface S2 to be used for when GGSN switches between GGSN and ISR, notify The change of ISR correlations AID-RID bindings, it can also be used to which GGSN notifies ISR registrations, deletes AID-RID bindings.GGSN and ISR it Between data-interface D2 be used for GGSN and forward the be sent to data and ISR of external network that MS sends to be sent to GGSN to ISR The data of MS.

The scope that ISR is not described with the data-interface D3 of external network in this patent.

The invention is not limited in above-mentioned framework.Because wireless access network may be using other structures, in other frameworks Middle Target RNC is probably other wireless side network elements.

In the reorientation set-up procedure based on above WCDMA core net framework, GGSN no longer needs grappling, can basis The switching that the switching of SGSN carries out GGSN is roundabout to reduce route.

Hereafter it is been described by mainly for the improvement carried out on original system for realization switches without fixed anchor point, including The function and flow process of correlation.

Wen Zhong, when certain network element of description is processed terminal switching as former side network element, the terminal is called to cut out terminal； When certain network element of description is processed terminal switching as target side network element, the terminal is called incision terminal.Wen Zhong, will also be eventually The network element that the Correspondent Node at end is accessed is referred to as opposite end network element；Separately, when the function of certain network element is stated, the network element will be linked into User terminal be referred to as terminal, be referred to as Correspondent Node with the user terminal of user terminal communication for accessing the network element.

Embodiment one

WCDMA core net framework of the present embodiment based on Fig. 5 descriptions, describes the service SRNS reorientations without anchor point GGSN Journey, handoff procedure no data is lost, and after the completion of switching, the data message of MS is route by new GGSN, circuitous to reduce route Return.

As shown in fig. 7, the flow process of the present embodiment service SRNS repositioning process includes：

Step 701-711：Compared with 301-311 the step of service SRNS reorientation flow processs.

The new SGSN of step 712. signals former SGSN, SRNS reorientations by sending forwarding reorientation completion message Process is completed.Step 712 and step 713 can occur simultaneously.Step 712 is consistent with existing procedure step 312.

The new SGSN of step 713a sends renewal PDP Context request message and (wherein carries for chain of command to former GGSN New SGSN addresses, SGSN TEID (tunnel endpoint identifier), for the new RNC addresses of medium surface, RNC TEID, discuss and decide QoS, DTI etc.), compared with the step of service SRNS reorientation flow processs 313.

Step A. original GGSN receive renewal PDP Context request message after, according in message carry new SGSN addresses, certainly It is fixed whether to need to switch GGSN, it is determined whether needing switching GGSN can also to access external service according to local policy The modes such as device acquisition information, if not switching, GGSN is identical with existing follow-up process, the present embodiment mainly describes switching GGSN's Situation.

Former GGSN is if it is determined that switching GGSN, can inquire about locally configured, inquiry external server according to the address of new SGSN Etc. the address (selecting new GGSN) that mode obtains new GGSN；After new GGSN addresses are obtained, former GGSN to new GGSN sends PDP Context PUSH message, may include the IMSI and/or AID of MS, PDP Context information (bag in PDP Context PUSH message Containing new SGSN, the address of new RNC and TEID, DTI), the information such as authentication information of MS.The mesh of PDP Context PUSH message herein Be to notify that new GGSN MS need switching, and MS related PDP Context, authentication information etc. are sent to new GGSN, do not limit to In a piece of news.

The new GGSN of step B. is received after the PDP Context PUSH message that former GGSN sends, be MS distribute one its own Used as the RID of MS, the RID can be the address (i.e. the second address information) of acceptance original GGSN message, or one for address Other IP address of newly assigned new GGSN；Meanwhile, new GGSN is the context distribution GTP (GPRS of the MS for receiving Tunneling Protocol, GPRS Tunnel Protocol) tunnel (including chain of command and medium surface TEID).

The new GGSN of step C1. to former GGSN sends PDP Context PUSH message response, and whether response receives including new GGSN Switching, the IMSI of MS, new GGSN addresses (can be identical with the IP address for receiving original GGSN message, it is also possible to different), new GGSN controls Face processed and the AID of medium surface TEID, MS, are the RID of MS distribution, and TEID is forwarded temporarily (if MS needs GGSN to PDU data bag Sorted with PDU serial numbers), the letter such as interim PDU serial numbers (if MS needs GGSN to sort PDU data bag PDU serial numbers) Breath.

Step C2. original GGSN receives the PDP Context PUSH message response that new GGSN sends, if new GGSN does not receive to cut Change, former GGSN can be according to strategy and another GGSN repeat step A of selection of configuration；Trial can also be no longer switched over, is used Existing procedure completes to service SRNS repositioning process.

If new GGSN receives switching, former GGSN to new GGSN sends PDP Context handover request, it may include the IMSI of MS And/or AID, up-downgoing PDU serial numbers (if MS need GGSN to PDU data bag PDU serial numbers sort) etc. information.

If MS needs GGSN to sort descending PDU data bag PDU serial numbers, former GGSN start by downlink data packet to The interim forwarding TEID of new GGSN sends, using interim PDU serial numbers；New GGSN is sorted after receiving with descending PDU serial numbers, is made Sent to new RNC with the medium surface TEID of new RNC.

If MS does not need GGSN that descending PDU data bag is sorted with PDU serial numbers, original GGSN can use new RNC's Medium surface TEID to new RNC is forwarded.The situations that sorted with PDU serial numbers to descending PDU data bag of GGSN are not needed for MS, newly GGSN is not required to distribute interim forwarding TEID and interim PDU serial numbers, and PDP Context PUSH message response in step C1 is not required to carry Interim forwarding TEID and interim PDU serial numbers；Former GGSN can not to PDP Context handover request in new GGSN forwarding steps C2, New GGSN is sent using the medium surface TEID of new RNC when the data for being sent to MS are received to new RNC.

Former GGSN can directly encapsulate the upstream data bag of forwarding MS, or be turned to new GGSN with the medium surface TEID of new GGSN Send out.

Step 713b. original GGSN sends to new SGSN and updates PDP Context response, and with original process step 313 PDP is updated Context response information form is consistent, but medium surface TEID and chain of command TEID fill in the new GGSN's that receives in step C1 Medium surface TEID and chain of command TEID；The GGSN addresses of medium surface and the GGSN addresses of chain of command fill in what is received in step C1 The GGSN addresses and the GGSN addresses of chain of command of the medium surface of new GGSN.After this step, new SGSN starts to new GGSN, rather than Former GGSN sends chain of command data；If not adopting direct tunnel mode, new SGSN starts to new GGSN, rather than original GGSN Send medium surface data.

If step C3. is using direct tunnel mode, new SGSN notifies the medium surface address of the new GGSN of new RNC and TEID, After this step, new RNC starts to new GGSN, rather than original GGSN sends medium surface data.

Step D. original GGSN according to the communication opposite end table of MS, can search the opposite end GGSN (removing new GGSN) of all MS associations, The message of MS AID-RID mapping changes is sent, and receives the response of AID-RID mapping change message.

Step E. original GGSN to ILR sends the message of AID-RID mapping changes, and receives the response of ILR.

Step F. original GGSN receives the response of the AID-RID mapping change message of all opposite ends (GGSN, ISR, ILR) transmission Afterwards, can stop forwarding data to new GGSN, delete relevant information；Meanwhile, sending to new GGSN and stop forwarding message, new GGSN is received The interim forwarding TEID and interim PDU serial numbers of distribution can be deleted to after the message.

If not requiring that PDU serial numbers sort, can not send to new GGSN and stop forwarding message.

Step F also can arrange repeating timer in former GGSN, stop forwarding to new GGSN transmissions after timer expiry and disappear Breath.

Also aging mechanism can be used to interim forwarding TEID and interim PDU serial numbers in new GGSN, then can not be to new GGSN Transmission stops forwarding message.

Step 714. receives forwarding reorientation completion message, and former SGSN sends Iu release commands and gives source RNC.When RNC numbers Expire according to repeating timer, source RNC is responded with Iu Release completes.Step 714 is consistent with existing procedure step 314.

Step 715.MS initiates Routing Area Update process, because MS is in PMM-CONNECTED patterns, what it was only carried out The a subset of RA renewal processes.Step 715 is consistent with existing procedure step 315.

The present embodiment step A to F is the change of the different existing procedures of this patent, is updated by the PDP Context of new SGSN Message trigger, for the seamless switching of GGSN.With combine direct-cut operation and SRNS reorientation flow processs, united cell/URA and service The flow process difference of RNS reorientations is wireless side, therefore does not affect the description of above-described embodiment.Step A to F is same for the present embodiment Can be used to the joint direct-cut operation and SRNS repositioning process and united cell of existing procedure/URA update and SRNS reorientations Journey, is triggered by the PDP Context new information of new SGSN, realizes the seamless switching of GGSN.

Additionally, the present embodiment can also have following variants/alternative：

For example, in step C2, the AID-RID cachings of the communication opposite end that former GGSN can also be preserved are sent to newly GGSN。

For example, in step D, there are various ways notification communication opposite end：

Mode one, execution step D, does not only carry out step E, and the renewal of the map information of AID-RID is notified by ILR；

Mode two, using broadcast advice method.

For example, it is also possible to not execution step D, all data for being sent to MS of former GGSN forwardings are to new GGSN, and forwarding time It is longer than the time of all GGSN cachings AID-RID mappings, it is ensured that former GGSN forwards all opposite end GGSN old due to AID-RID cachings Change, inquiry ILR obtains the packet before new AID-RID mappings.

Former GGSN can notify that opposite end network element (GGSN, ISR) MS has been switched to new GGSN when receiving the data for being sent to MS.

For example, step D and/or E also can be performed by new GGSN, and former GGSN can send the communication opposite end table of the MS of caching and send To new GGSN.

For example, if there is multiple PDP Contexts between original GGSN and MS, former GGSN is receiving last PDP Context During Notification of Changes, multiple PDP Contexts are disposably passed to new GGSN by execution step A-F.

Embodiment two

WCDMA core net framework of the present embodiment based on Fig. 5 descriptions, description joint direct-cut operation and SRNS reorientation flow processs, After the completion of joint direct-cut operation and SRNS reorientation flow processs, MS is associated with new SGSN with new GGSN.

Step 801：Source RNC initiates the joint direct-cut operation of ps domain and SRNS reorientations.Compared with joint direct-cut operation and SRNS Reorientation flow process.

Step 802：Source RNC is by sending re-positioning request (Relocation Required) message to original SGSN (Old SGSN), reorientation set-up procedure is initiated；The reorientation type that includes in the re-positioning request, reason, cell-of-origin ID, target are little The contents such as area ID, source RNC to Target RNC Transparent Container.Unlike step 702, here reorientation type is set to " relate to And UE ".Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 803-807：It is similar with step 703-707, compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 808：Source RNC triggers the execution of SRNS reorientations by sending RRC information to MS；Terminal sends RRC information To Target RNC.Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 809：Source RNC sends transmission RNC contexts (Forward SRNC by original SGSN, new SGSN to Target RNC Context) message.Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 810：When Target RNC finds terminal in its service area, Target RNC to new SGSN sends reorientation detection (Relocation Detect) message.Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 811：When Target RNC receives the RRC information that terminal sends over (step 808), Target RNC is to new SGSN Send reorientation and complete (Relocation Complete) message.Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 812：New SGSN signals former SGSN, SRNS reorientations by sending forwarding reorientation completion message Process is completed.Step 812 and step 813 can occur simultaneously.Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 813a：New SGSN sends renewal PDP Context request message and (wherein carries for chain of command to former GGSN New SGSN addresses, SGSN TEID (tunnel endpoint identifier), for the new RNC addresses of medium surface, RNC TEID, discuss and decide QoS, DTI etc.), compared with joint direct-cut operation and SRNS reorientation flow processs.

Step A：With step A of embodiment one.

Step B：With step B of embodiment one.

Step C1：With step C1 of embodiment one.

Step C2：With step C2 of embodiment one.

Step 813b：With step 713b of embodiment one.

Step C3：With step C3 of embodiment one.

Step D：With step D of embodiment one.

Step E：With step E of embodiment one.

Step F：With step F of embodiment one.

Step 814：Forwarding reorientation completion message is received, former SGSN sends Iu release commands and gives source RNC.When RNC numbers Expire according to repeating timer, source RNC is responded with Iu Release completes.Compared with joint direct-cut operation and SRNS reorientation flow processs.

Step 815：Position updating process, compared with joint direct-cut operation and SRNS reorientation flow processs.

Additionally, the present embodiment can also have and the identical variants of embodiment one.

Embodiment three

WCDMA core net framework of the present embodiment based on Fig. 5 descriptions, describes united cell/URA and SRNS and resets bit stream Journey, after the completion of united cell/URA and SRNS reorientation flow processs, MS is associated with new SGSN with new GGSN.

Step 901：Terminal to source RNC send cell update (Cell Update) message, or send URA Update or Cell Update or GRA Update.Compared with united cell/URA and SRNS reorientation flow processs.

Step 902-909：It is similar with step 702-709 of embodiment one.Reset compared with united cell/URA and SRNS Bit stream journey.

Step 910：Target RNC sends cell update and confirms (Cell Update Confirm) message to terminal, or Send URA Update Confirm or Cell Update Confirm or GRA Update Confirm；Terminal is to Target RNC Send RAN mobility informations and confirm message (RAN Mobility Information Confirm).Compared with united cell/ URA and SRNS reorientation flow processs.

Step 911：When Target RNC receives (step 910) when the RAN mobility informations that terminal sends over confirm message, Target RNC sends reorientation and completes (Relocation Complete) message to new SGSN.Compared with united cell/URA and SRNS reorientation flow processs.

Step 912：New SGSN signals former SGSN, SRNS reorientations by sending forwarding reorientation completion message Process is completed.Step 912 and step 913 can occur simultaneously.Compared with united cell/URA and SRNS reorientation flow processs.

Step 913a：New SGSN sends renewal PDP Context request message and (wherein carries for chain of command to former GGSN New SGSN addresses, SGSN TEID (tunnel endpoint identifier), for the new RNC addresses of medium surface, RNC TEID, discuss and decide QoS, DTI etc.), compared with united cell/URA and SRNS reorientation flow processs.

Step A：With step A of embodiment one.

Step B：With step B of embodiment one.

Step C1：With step C1 of embodiment one.

Step C2：With step C2 of embodiment one.

Step 913b：With step 713b of embodiment one.

Step C3：With step C3 of embodiment one.

Step D：With step D of embodiment one.

Step E：With step E of embodiment one.

Step F：With step F of embodiment one.

Step 914：Forwarding reorientation completion message is received, former SGSN sends Iu release commands and gives source RNC.When RNC numbers Expire according to repeating timer, source RNC is responded with Iu Release completes.Bit stream is reset compared with united cell/URA and SRNS Journey.

Step 915：Position updating process, compared with united cell/URA and SRNS reorientation flow processs.

Example IV

WCDMA core net framework of the present embodiment based on Fig. 5 descriptions, describes Routing Area Update process, and Routing Area Update is complete Cheng Hou, MS are associated with new SGSN with new GGSN.

Step 1001-1008：It is identical process step 401-408 to be updated with existing route area.

The new SGSN of step 1009a to former GGSN send update PDP Context request message (wherein carry new SGSN addresses, SGSN TEID (tunnel endpoint identifier), for the new RNC addresses of medium surface, RNC TEID, discuss and decide QoS etc.), compared with road Step 409 is updated by area.

Step A：Former GGSN receive renewal PDP Context request message after, according in message carry new SGSN addresses, certainly It is fixed whether to need to switch GGSN, it is determined whether needing switching GGSN can also to access external service according to local policy The modes such as device acquisition information, if not switching, GGSN is identical with existing follow-up process, the present embodiment mainly describes switching GGSN's Situation.

Former GGSN is if it is determined that switching GGSN, can inquire about locally configured, inquiry external server according to the address of new SGSN Etc. the address that mode obtains new GGSN；After new GGSN addresses are obtained, former GGSN sends PDP Context and pushes and disappears to new GGSN Breath, may include the IMSI and/or AID of MS in PDP Context PUSH message, PDP Context information (address comprising new SGSN with TEID), the information such as authentication information of MS.Herein the purpose of PDP Context PUSH message is to notify that new GGSN MS need switching, And MS related PDP Context, authentication information etc. are sent to new GGSN, it is not limited to a piece of news.

The new GGSN of step C1. to former GGSN sends PDP Context PUSH message response, and whether response receives including new GGSN Switching, the IMSI of MS, new GGSN addresses (can be identical with the IP address for receiving original GGSN message, it is also possible to different), new GGSN controls Face processed and the AID of medium surface TEID, MS, are the information such as the RID of MS distribution.

Step C2 original GGSN receives the PDP Context PUSH message response that new GGSN sends, if new GGSN does not receive to cut Change, former GGSN can be according to strategy and another GGSN repeat step A of selection of configuration；Trial can also be no longer switched over, is used Existing procedure completes to service SRNS repositioning process.

Former GGSN can use the medium surface TEID of new SGSN to forward to new SGSN.Former GGSN can directly encapsulate the upper of forwarding MS Row packet, or forwarded to new GGSN with the medium surface TEID of new GGSN.

Step 713b. original GGSN sends to new SGSN and updates PDP Context response, and with original process step 313 PDP is updated Context response information form is consistent, but medium surface TEID and chain of command TEID fill in the new GGSN's that receives in step C1 Medium surface TEID and chain of command TEID；The GGSN addresses of medium surface and the GGSN addresses of chain of command fill in what is received in step C1 The GGSN addresses and the GGSN addresses for chain of command of the medium surface of new GGSN.After this step, new SGSN starts to new GGSN, and It is not that former GGSN sends data.

Step 1010-1019：It is identical process step 410-419 to be updated with existing route area.

Because TD-SCDMA core nets and WCDMA core nets use same architecture, therefore technical solution of the present invention equally can be with For TD-SCDMA and similar framework core network.

In order to realize preceding method, present invention also offers a kind of Serving GPRS Support Node (SGSN), special with the present invention Not relatively, as shown in figure 12, the SGSN includes upstream message processing module and downstream message processing module, occurs in terminal Under mobile scene, during as new SGSN：

The downstream message processing module, for receiving the 5th message that former GGSN sends and sending to the Target RNC 6th message, carries the up medium surface tunnel that the new GGSN is the terminal distribution in the 5th message and the 6th message Track address.

Further, the first message is reorientation completion message, and second message please to update PDP Context Ask, to update PDP Context response, the 6th message is notification message to the 5th message.

Present invention also offers a kind of Gateway GPRS Support Node (GGSN), especially relevantly with the present invention, such as Figure 13 institutes Show, the GGSN includes receiver module, address assignment module and sending module, under the scene that terminal is moved：

Further, to update PDP Context request, the 3rd message is PDP Context push to second message Message, the 4th message is that PDP Context pushes response message, and the 5th message is renewal PDP Context response.

Preferably, the 3rd message also carries the realization switching information needed of the terminal, the address of the new GGSN Distribute module, switches information needed and distributes the up media surface tunnel address according to the realization of the terminal.

Further, the GGSN also includes switching control module, under the scene that terminal is moved, as original During GGSN, for selecting the new GGSN when switching is determined；The sending module, to the new GGSN for selecting the described 3rd is sent Message.

In the present invention, the up media surface tunnel address includes the medium surface address of new GGSN and medium surface TEID, institute State medium surface address and medium surface TEID of the downstream media face tunnel address including Target RNC.

The scene that the terminal is moved includes：Serving RNC reorientation (Serving RNS Relocation) scene, It is joint direct-cut operation and SRNC reorientations (Combined Hard Handover and SRNS Relocation) scene, united Cell/URA and SRNS reorientations (Combined Cell/URA Update and SRNS Relocation) scene.

In addition, the present invention also provided for it is a kind of set up direct tunnel realize system, the system is serviced as previously described GRPS supporting nodes (SGSN) and Gateway GPRS Support Node (GGSN), as shown in figure 14.

As described above, compared with prior art, the present invention can support identity and the position separating of terminal, keep away Exempt from route roundabout, and can as far as possible be based on existing reorientation flow process, not affect the concordance of existing reorientation flow process, with compared with Good feasibility.

These are only that the present invention's is preferable to carry out case, be not limited to the present invention, the present invention can also there are other Various embodiments, in the case of without departing substantially from spirit of the invention and its essence, those of ordinary skill in the art can be according to this It is bright to make various corresponding changes and deformation, but these corresponding changes and deformation should all belong to appended claims of the invention Protection domain.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realizing, they can be concentrated on single computing device, or are distributed in multiple computing devices and are constituted Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to they are stored Performed by computing device in the storage device, and in some cases, can be shown to perform different from order herein The step of going out or describe, or they are fabricated to respectively each integrated circuit modules, or by the multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

Claims

1. a kind of motion management method of direct tunnel, it is characterised in that under the scene that terminal is moved, the method bag Include：

Target radio network controller RNC passes sequentially through new demand servicing GPRS Support Node SGSN, former Gateway GPRS Support Node GGSN sends the downstream media face tunnel address that Target RNC is the terminal distribution to new GGSN；

The new GGSN is the up media surface tunnel address of terminal distribution, and passes sequentially through the former GGSN, new SGSN to described Target RNC sends the up media surface tunnel address；

The former GGSN to the new GGSN sends the 3rd message, and the 3rd message is PDP Context PUSH message, and described the Three message also carry the realization switching information needed of the terminal, and the new GGSN believes according to needed for the realization of terminal switching The breath distribution up media surface tunnel address.

2. the method for claim 1, it is characterised in that Target RNC to the new SGSN sends first message；

The new GGSN receives the 3rd message, and tunnel ground in the downstream media face is carried in the described first to the 3rd message Location；

The new GGSN sends the up media surface tunnel address by the former GGSN, new SGSN to the Target RNC Step, including：

The new GGSN to the former GGSN sends the 4th message；

The up media surface tunnel address is carried in 4th to the 6th message；

3. method as claimed in claim 2, it is characterised in that：The first message be reorientation completion message, described second To update PDP Context request, the 4th message is that PDP Context pushes response message to message, and the 5th message is for more New PDP Context response, the 6th message is notification message.

4. method as claimed in claim 2, it is characterised in that：After second message is received, judgement is the former GGSN It is no to need switching, determine to select new GGSN during switching, and send the 3rd message to the new GGSN for selecting.

5. the method as any one of Claims 1-4, it is characterised in that：The scene that the terminal is moved includes： Serving RNC reorientation (Serving RNS Relocation) scene, joint direct-cut operation and SRNC reorientation (Combined Hard Handover and SRNS Relocation) scene, united cell/URA and SRNS reorientation (Combined Cell/URA Update and SRNS Relocation) scene.

6. the method as any one of Claims 1-4, it is characterised in that：Chain of command tunnel address includes correspondence network element Control plane address and chain of command Tunnel End Point Identifier TEID, the media surface tunnel address include correspondence network element medium surface ground Location and medium surface TEID.

7. a kind of Serving GPRS Support Node SGSN, it is characterised in that the SGSN includes upstream message processing module and descending Message processing module, under the scene that terminal is moved, during as new SGSN：

The upstream message processing module, for receiving the first message of target radio network controller RNC transmissions, and to original Gateway GPRS Support Node GGSN sends the second message, and it is described that Target RNC is carried in the first message and the second message The downstream media face tunnel address of terminal distribution；

The downstream message processing module, for receiving the 5th message that former GGSN sends and sending the 6th to the Target RNC Message, carries the up media surface tunnel address that new GGSN is the terminal distribution in the 5th message and the 6th message.

8. SGSN as claimed in claim 7, it is characterised in that：The first message be reorientation completion message, described second To update PDP Context request, to update PDP Context response, the 6th message disappears the 5th message message for notice Breath.

9. SGSN as claimed in claim 7, it is characterised in that：The scene that the terminal is moved includes：Serving RNC resets Position (Serving RNS Relocation) scene, joint direct-cut operation and SRNC reorientations (Combined Hard Handover And SRNS Relocation) scene, united cell/URA and SRNS reorientations (Combined Cell/URA Update And SRNS Relocation) scene.

10. SGSN as claimed in claim 7, it is characterised in that：The up media surface tunnel address includes the matchmaker of new GGSN Honorable address and medium surface (Tunnel End Point Identifier) TEID, downstream media face tunnel address includes the medium surface of Target RNC Address and medium surface (Tunnel End Point Identifier) TEID.

11. a kind of Gateway GPRS Support Node GGSN, it is characterised in that the GGSN includes receiver module, address assignment module And sending module, under the scene that terminal is moved：

During as former GGSN, the receiver module, for receiving the second message that new SGSN sends, is additionally operable to receive new GGSN The 4th message sent；The sending module, for sending the 3rd message to new GGSN, is additionally operable to disappear to new SGSN transmissions the 5th Breath；The downstream media that target radio network controller RNC is the terminal distribution is carried in second message, the 3rd message Face tunnel address, in the 4th message and the 5th message up media surface tunnel address is carried；

During as new GGSN, the receiver module is additionally operable to receive the 3rd message that the former GGSN sends；The transmission Module, is additionally operable to send the 4th message to former GGSN；The address assignment module, for described in the terminal distribution Row media surface tunnel address；

3rd message is PDP Context PUSH message, and the 3rd message is also carried needed for the realization switching of the terminal Information, the address assignment module of the new GGSN switches information needed and distributes the up media according to the realization of the terminal Face tunnel address.

12. GGSN as claimed in claim 11, it is characterised in that：Second message is described to update PDP Context request 4th message is that PDP Context pushes response message, and the 5th message is renewal PDP Context response.

13. GGSN as claimed in claim 11, it is characterised in that：The GGSN also includes switching control module, sends out in terminal Under raw mobile scene, during as former GGSN, for selecting the new GGSN when switching is determined；The sending module, Xiang Xuan The new GGSN for selecting sends the 3rd message.

14. GGSN as any one of claim 11 to 13, it is characterised in that：The up media surface tunnel address bag Medium surface address and the media surface tunnel Endpoint ID TEID of new GGSN are included, downstream media face tunnel address includes target The medium surface address of RNC and medium surface TEID.

15. GGSN as any one of claim 11 to 13, it is characterised in that：The scene bag that the terminal is moved Include：Serving RNC reorientation (Serving RNS Relocation) scene, joint direct-cut operation and SRNC reorientation (Combined Hard Handover and SRNS Relocation) scene, united cell/URA and SRNS reorientation (Combined Cell/URA Update and SRNS Relocation) scene.

16. a kind of mobility management systems of direct tunnel, it is characterised in that the system is included as appointed in claim 7 to 10 Serving GPRS Support Node SGSN described in one and the gateway GPRS as any one of 11 to 15 in claim are supported Node GGSN.