CN102123378B

CN102123378B - Method for switching terminal and corresponding communication network

Info

Publication number: CN102123378B
Application number: CN201010002253.4A
Authority: CN
Inventors: 周娜; 吴强; 符涛
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-01-12
Filing date: 2010-01-12
Publication date: 2015-01-28
Anticipated expiration: 2030-01-12
Also published as: WO2011085618A1; CN102123378A

Abstract

The invention discloses a method for switching a terminal and a corresponding communication network. The communication network comprises a wireless side network element, an access gateway which is connected between the wireless network element and a packet data network, a mobility management node and an identity position register. In the process of switching the terminal, when a target access gateway different from the original access gateway is determined, the target access gateway allocates the identifier of a new position for the terminal and saves the mapping information of the identifier of the identity of the terminal and the identifier of the new position; a target mobility management node or the target access gateway initiates registration and updates the identifier of the position of the terminal in the identity position register to which the terminal belongs; and the terminal is switched from the original wireless side network element to a target wireless side network element, and is connected to the packet data network by the target wireless side network element and the target access gateway, so that data messages is encapsulated and forwarded between the terminal and a communication opposite end. Through the invention, the route detours of data packets can be reduced, transmission delay and bandwidth waste can be lowered.

Description

A kind of method of terminal switch and corresponding communication network

Technical field

The present invention relates to communication technical field, particularly relate to a kind of method of terminal switch and corresponding communication network.

Background technology

Third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) grouping system (the Evolved Packet System of evolution, referred to as EPS) by universal mobile telecommunications system land radio access web (the Evolved Universal Terrestrial Radio AccessNetwork of evolution, referred to as E-UTRAN), Mobility Management Entity (Mobility Management Entity, referred to as MME), gateway (Serving Gateway, S-GW), grouped data network gateway (Packet Data Network Gateway, referred to as P-GW or PDN GW), home subscriber server (Home Subscriber Server, referred to as HSS), authentication and authorization charging (the Authentication of 3GPP, Authorization and Accounting, referred to as AAA) server, "Policy and Charging Rules Function (Policy and Charging Rules Function, referred to as PCRF) entity and other support nodes composition.

Fig. 1 a is the schematic diagram of the EPS framework of prior art, and as shown in the figure, MME is responsible for the related work of the chain of command such as process and the contextual management of user's mobile management of mobile management, Non-Access Stratum signaling; S-GW is the accessing gateway equipment be connected with E-UTRAN, forwarding data between E-UTRAN and P-GW, and is responsible for carrying out buffer memory to pending datas such as pagings; P-GW is then the borde gateway of EPS and packet data network (Packet Data Network, referred to as PDN) network, be responsible for PDN access and between EPS and PDN the function such as forwarding data.

In 3 gpp, corresponding PDN network can be found by APN (Access Point Name, referred to as APN).Usually UE to PDN network connection is called that an IP connects Access Network (IP Connectivity Access Network, referred to as IP-CAN) session.

When terminal is moved, P-GW is using the anchor point (as shown in Figure 1 b) as fast mobile terminal.On the basis of Fig. 1 b system, in prior art, terminal is carried out handoff procedure (as illustrated in figure 1 c), is carried out the flow process concrete steps of data retransmission be described below by the interface of S-GW:

Step 1c01, wireless side network element judges that needing to send S1 switches;

Step 1c02, former wireless side network element sends handover request to former MME;

Step 1c03, former MME are sending reorientation forwarding request message to target MME;

Step 1c04, target MME send session establishment request to target S-GW, band P-GW relevant information;

Step 1c05, target S-GW reply session establishment response message to target MME,

It is that the tunnel information of tunnel distributing between foundation and Target Wireless side network element is as Tunnel Identifier that this step can carry target S-GW.

Step 1c06, target MME request target wireless side network element performs switching;

The tunnel information that target S-GW distributes can be passed to Target Wireless side network element by this step.

Step 1c07, Target Wireless side network element responds switching request acknowledgement message to target MME;

This step, Target Wireless side network element creates UE context and reserved resource, in switching request acknowledgement message, carrying tunnel information that Target Wireless side network element distributes (being the tunnel distributing for setting up and between target S-GW) herein, also needing the forwarding tunnel information of carrying between S-GW.

Step 1c08, target MME send forwarding tunnel to target S-GW and set up request, ask the data forwarding tunnel set up between S-GW;

Step 1c09, target S-GW reply forwarding tunnel to target MME and set up response, the forwarding tunnel mark that the forwarding tunnel between carrying as S-GW distributes;

Step 1c10, target MME send reorientation forward response message to former MME;

Step 1c11, former MME send forwarding tunnel to former S-GW and set up request, ask the data forwarding tunnel set up between S-GW, carry the forwarding tunnel mark that target S-GW distributes;

Step 1c12, former S-GW reply former MME forwarding tunnel and set up response;

Step 1c13, former MME send switching command to former wireless side network element;

Step 1c14, former wireless side network element sends switching command to terminal;

Now, the downlink data message issuing this terminal that former network receives mails to objective network by from the forwarding tunnel between S-GW;

Step 1c15, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 1c16, Target Wireless side network element notification target MME switches;

Step 1c17, target MME send reorientation forward completion notice message to former MME;

Step 1c18, former MME reply reorientation forward to target MME and complete acknowledge message;

Step 1c19, target MME request target S-GW revises beared information, carries the tunnel information of Target Wireless side network element distribution as Tunnel Identifier; After target S-GW receives this tunnel information, if S-GW reorientation, then target S-GW sends amendment bearing request message to P-GW, carries the tunnel information that target S-GW distributes;

After this step target S-GW receives the tunnel information of Target Wireless side network element distribution, just for this terminal establishes the tunnel between the network element of Target Wireless side, for sending the downlink data message of this terminal, be called downlink tunnel.In step 1c06, after Target Wireless side network element receives the tunnel information of target S-GW distribution, just for this terminal establishes the tunnel between target S-GW, the uplink data messages of this terminal can be sent, be called uplink tunnel.The mode setting up tunnel in literary composition everywhere between two network elements is similar, repeats no more.

Step 1c20, if S-GW reorientation, then target P-GW responds bearing modification result to target S-GW.Target S-GW responds bearing modification result to target MME;

Step 1c21, performs former BlueDrama and deletes and forwarding tunnel release flow process.This flow process can be triggered by timer by former MME.

As can be seen here, prior art only considers and adopts anchored mode to realize the continuity of business in fast mobile terminal process, but this fixed anchor point method causes the roundabout problem of packet path, has increased the weight of transmission delay and bandwidth waste.

Above-mentioned Problems existing is what the address of TCP/IP and the community of identity caused in essence.In order to address these problems, industry is currently suggested multiple new mobile management technology.Its essential idea is user identity and position isolation technics.In prior art, existing relating identity mark is separated the solution of (SILSN:Subscriber Identifier & Locator Separation Network) with position, if Host Based realization is as HIP technology, and based on the realization of router as location identity separated protocol (LISP) technology, relevant multiple technologies are had again to support in often kind of realization, in these schemes, the identify label (being expressed as AID in literary composition) of terminal use does not change in moving process, route and the forwarding of data message is realized according to position otherwise allocated station location marker (being expressed as RID in literary composition) of terminal.

Fig. 1 d shows a kind of identify label and locator separation network (Subscriber Identifier & LocatorSeparation Network, be called for short SILSN) framework, the network topology of this SILSN framework is divided on topological relation does not have overlapping Access Network and backbone network, Access Network is positioned at the edge of backbone network, be responsible for the access of all terminals, backbone network is responsible for route and the forwarding of the inter-terminal data message accessed.In network, represent the User Identity of terminal with AID, in fast mobile terminal process, remain constant; Represent that network is the station location marker of terminal distribution with RID, use at backbone network.It should be noted that identify label and station location marker can have different titles at different SILSN frameworks, should be considered as being equal to.

In SILSN framework, terminal can be one or more in mobile terminal, fixed terminal and roam terminals, as mobile phone, landline telephone, computer and server etc.

In SILSN framework, Access Network is used for providing two layers (physical layer and link layers) to access means, the physics access link between maintenance terminal and ASN for terminal.

In SILSN framework, the main network elements of backbone network comprises:

Access service node (ASN:Access Service Node) is for being terminal distribution RID, the AID-RID map information of maintenance terminal, the RID of (also can be described as registration) and inquiry terminal is registered to ILR, and realizing route and the forwarding of data message, terminal must access backbone network through ASN.The RID that ASN distributes points to this ASN, also namely comprises the address information of this ASN, and during using this RID as the destination address of data message, this data message will be routed to this ASN.

Generic router (CR:Common Router), for carrying out routing according to the RID in data message, forwards the data message of address for the purpose of RID.

Identity position register (ILR:Identity Location Register), ILR, for the treatment of the registration to terminal RID, cancellation and inquiry, preserves and safeguards identify label and station location marker (AID-RID) map information of home subscriber terminal;

Alternatively, backbone network can also comprise:

Packet forwarding (PTF:Packet Transfer Function), also referred to as packet forwarding node, for after the data message receiving the transmission of home subscriber terminal, find the RID of Correspondent Node according to Correspondent Node AID in data message and after being encapsulated in header, be forwarded to broad sense Forwarding plane.

Interconnect services node (ISN), has the interface with generic router, ASN and ILR, for realizing interconnecting of two networks.

Above-mentioned ILR, or ILR and PTF constitutes the mapping forward plane of backbone network, CR, or CR and ISN constitutes the broad sense Forwarding plane of backbone network.

Based on the network of SILSN framework, because the identify label of terminal is separated with position, terminal and Correspondent Node identify the other side by AID, use RID to realize route and the forwarding of data message.When fast mobile terminal, AID is constant, and to keep the correspondence of terminal and Correspondent Node, RID can redistribute with fast mobile terminal, thus can carry out without fixed anchor point mobility by support terminal, solves the problem that packet path is roundabout.

When communicating in SILSN framework, ASN receives uplink data messages will carry out RID encapsulation and forwarding.Particularly, at the RID of local search Correspondent Node, as inquired, using the RID of Correspondent Node as destination address, comprise in the data message of terminal AID and Correspondent Node AID with terminal RID for source address is encapsulated in, be forwarded to the ASN of Correspondent Node access through broad sense Forwarding plane.As inquiry less than, arrive Correspondent Node belong to ILR inquire the RID of Correspondent Node and be kept at this locality.Now, after can encapsulating the RID of terminal in message, be forwarded to broad sense Forwarding plane by mapping forward plane, or, after inquiring the RID of Correspondent Node, then carry out RID encapsulation and forward process at local search to the mode during RID of Correspondent Node by above-mentioned by this ASN.At down direction, ASN carries out solution RID encapsulation after receiving the data message that broad sense Forwarding plane sends, send to terminal after peelling off RID wherein.

Can find out, ASN is in order to realize the normal forwarding of message, and needing when terminal accesses is this terminal distribution RID, registers this RID to upgrade the RID of this terminal in ILR to ILR.ASN also needs the AID-RID map information of maintenance terminal and Correspondent Node thereof, realizes encapsulating the RID of message.In one example, ASN is the correspondence information of this terminal of each terminal maintenance and Correspondent Node, be called in literary composition this terminal to client information, this opposite end packets of information is containing the correspondence relationship information of this terminal AID and Correspondent Node AID, the AID-RID map information of this terminal can also be comprised, meanwhile, the unified AID-RID map information safeguarding the Correspondent Node of all terminals of ASN.Certainly, ASN is that each terminal safeguards that the AID-RID map information of all Correspondent Nodes of this terminal is also fine respectively, wherein contain terminal to client information.Safeguarding client information, is in order to when terminal switch, and the ASN of incision side can determine which Correspondent Node is this terminal have, thus can send the new RID of this terminal to the ASN of Correspondent Node access.After the ASN that Correspondent Node accesses completes renewal, just the data message that Correspondent Node sends can be routed directly to the ASN that this terminal switch arrives.But the RID not proceeding to opposite end upgrades, opposite end P-GW also can upgrade the RID of this terminal by modes such as the inspections of message that sends terminal.

But in the handoff procedure of the communication system that prior art for how is separated with medium surface at chains of command such as LTE, the identify label of support terminal is separated with position, avoids occurring that route is roundabout, does not all propose corresponding implementation.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of method of terminal switch and corresponding communication network, roundabout with the path of reducing packet, reduces transmission delay and bandwidth waste.

In order to solve the problem, the invention provides a kind of method of terminal switch, be applied to the communication network comprising wireless side network element, be connected to IAD, mobile management node and identity position register (ILR) between wireless side network element and packet data network, the method comprises:

In terminal switching process, when determining the target access gateway different from former IAD, this target access gateway is station location marker (RID) that this terminal distribution is new and preserves the map information of this terminal identity mark (AID) and this new RID; Target MMN or target access gateway initiate RID registration, and the RID of this terminal in this terminal attaching ILR is updated to new RID;

This terminal is connected to packet data network by this Target Wireless side network element and target access gateway after being switched to Target Wireless side network element from former wireless side network element, realizes encapsulation and the forwarding of data message between this terminal and Correspondent Node.

Further, said method also can have following characteristics:

This target access gateway is after the RID that this terminal distribution is new, and the gateway also accessed to the Correspondent Node of this terminal sends RID update notification, carries AID and this new RID of this terminal; Or

This target access gateway is after the RID that this terminal distribution is new, and the RID that this is new is sent to target MMN, and the MMN that this target MMN accesses to the Correspondent Node of this terminal sends RID update notification, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

After determining the target access gateway different from former IAD, also set up the forwarding tunnel between this target access gateway and former IAD;

After this forwarding tunnel is set up, this former IAD receives after Correspondent Node issues the data message of this terminal, this target access gateway is forwarded to by this forwarding tunnel, this this data message of target access gateway buffer memory or be forwarded to Target Wireless side network element buffer memory, after this terminal switch to this Target Wireless side network element, then by this Target Wireless side network element, data message is sent to this terminal.

Further, said method also can have following characteristics:

IAD maintenance terminal in described communication network to client information, and the AID-RID map information of all Correspondent Nodes of terminal, described opposite end packets of information is containing the correspondence relationship information of this terminal AID and Correspondent Node AID;

In handoff procedure, former IAD is sent to this target access gateway by this terminal safeguarded to the AID-RID map information of client information and/or all Correspondent Nodes of this terminal;

This target access gateway is RID that this terminal distribution is new and receives described to after client information, and the gateway transmission RID update notification that the Correspondent Node to this terminal access, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

Described communication network is grouping system (EPS) network of evolution, the function of described IAD is realized by the gateway (S-GW) in EPS network and grouped data network gateway (P-GW), and described MMN is the Mobility Management Entity (MME) in EPS network or the Serving GPRS Support Node (SGSN) in 3G system.

Further, said method also can have following characteristics:

After the switching initiation of S1 interface, when the target P-GW that target MMN determines is different from former P-GW, the address information of the AID of this terminal and former P-GW is sent to this target P-GW through target S-GW; After this target P-GW receives, for this terminal distribution points to the new RID of this P-GW, preserve the map information of this terminal AID and this new RID, and directly or indirectly the tunnel information of distribution is sent to former P-GW, set up the forwarding tunnel of this terminal between this target P-GW and former P-GW;

Afterwards, former MMN starts hand-off execution process, this terminal switch, to Target Wireless side network element, is connected to packet data network by this Target Wireless side network element, target S-GW and target P-GW, is realized encapsulation and the forwarding of data message between this terminal and Correspondent Node by this connection.

Further, said method also can have following characteristics:

This target P-GW is after the RID that this terminal distribution is new, sends RID registration request, carry this terminal AID and new RID to terminal attaching ILR; Or this target P-GW is after the RID that this terminal distribution is new, this new RID is sent to this target MMN through target S-GW, this target MMN sends RID registration request to this terminal attaching ILR, carries this terminal AID and new RID;

After this terminal attaching ILR receives, the RID in this terminal AID-RID map information preserved is updated to this new RID.

Further, said method also can have following characteristics:

The AID of this terminal and the address information of former P-GW are the session establishment requests being sent to this target S-GW by this target MMN, and this target S-GW receive session establishment request after to this target P-GW send session establishment request be sent to this target P-GW's;

This target P-GW is after the tunnel distributing tunnel information of this terminal between foundation and target S-GW, replys session establishment response to this target S-GW; This target S-GW replys session establishment response to this target MMN;

This target MMN asks this Target Wireless side network element to perform switching again, and this Target Wireless side network element responds switching request acknowledgement message to this target MMN.

Further, said method also can have following characteristics:

Between this target P-GW and former P-GW, the data forwarding channel of this terminal is set up by following process: this target P-GW sends forwarding tunnel by the signaling interface between P-GW to this former P-GW and sets up request, carries target P-GW and sets up and forwarding tunnel information that between former P-GW, the forwarding tunnel of this terminal distributes; After this former P-GW receives, reply forwarding tunnel to this target P-GW and set up response.

Further, said method also can have following characteristics, and between this target P-GW and former P-GW, the data forwarding channel of this terminal is set up by following process:

This target MMN sets up forwarding tunnel by this target S-GW to this target P-GW request, after this target P-GW receives, identify for the forwarding tunnel of this terminal between foundation and former P-GW distributes forwarding tunnel, send this forwarding tunnel mark to this target MMN by this target S-GW;

When this target MMN is different from former MMN, this forwarding tunnel mark is delivered to this former MMN;

This former MMN sends forwarding tunnel by this former S-GW to this former P-GW and sets up request, carries this forwarding tunnel mark; After this former P-GW receives, the forwarding tunnel of this terminal between foundation and this target P-GW, replys forwarding tunnel by this former S-GW to this former MMN and sets up response.

Further, said method also can have following characteristics:

This target MMN is that the session establishment request sent to this target S-GW by this target MMN sets up forwarding tunnel with the session establishment request that this target S-GW sends to this target P-GW to this target P-GW request; This target P-GW sends this forwarding tunnel mark to this target MMN by this target P-GW to the session establishment response that the session establishment that this target S-GW replys responds and this target S-GW replys to this target MMN; Or, this target MMN is after the Handover Request Acknowledge receiving the network element response of Target Wireless side, asks to set up forwarding tunnel to the forwarding tunnel foundation request that the forwarding tunnel foundation that this target S-GW sends is asked and this target S-GW sends to this target P-GW by this target MMN to this target P-GW; This target P-GW sends this forwarding tunnel mark to this target MMN by this target P-GW to the forwarding tunnel foundation response that the forwarding tunnel foundation that this target S-GW replys responds and this target S-GW replys to this target MMN;

When this target MMN is different from former MMN, by reorientation forward response message, this forwarding tunnel mark is delivered to this former MMN.

Further, said method also can have following characteristics:

P-GW in this communication network preserve the terminal of access to client information; In handoff procedure, this former P-GW is sent to this target P-GW by this terminal of preserving to client information, this target P-GW is RID that this terminal distribution is new and receives described to after client information, the gateway accessed to the Correspondent Node of this terminal sends RID update notification, carries AID and this new RID of this terminal; Or

MMN in this communication network preserve the terminal of access to client information; In handoff procedure, when former MMN is different from target MMN, this terminal of preserving is sent to this target MMN to client information, this target MMN is initiated to the RID more new technological process of opposite end after receiving described this new RID sent client information and target P-GW.

Further, said method also can have following characteristics:

P-GW in this communication network safeguard and preserve access terminal to client information; This former P-GW by forwarding tunnel set up response by safeguard this terminal this target P-GW is sent to client information;

This target P-GW obtains the RID of described Correspondent Node according to the inquiry of the AID to Correspondent Node in client information of this terminal, and the gateway accessed to described Correspondent Node sends RID update notification, carries AID and this new RID of this terminal; Or this target P-GW is again by this new RID be describedly sent to this target MMN to client information, and this target MMN is initiated to the RID more new technological process of opposite end after receiving described this new RID transmitted client information and this target P-GW.

Further, said method also can have following characteristics:

P-GW in this communication network safeguard and preserve access terminal to client information; This former P-GW by forwarding tunnel set up response by safeguard this terminal through former S-GW, this former MMN is sent to client information, when this former MMN is different from target MMN, complete acknowledge message by reorientation forward and be sent to this target MMN by described to client information, this target MMN sends to the amendment of this target S-GW to carry request by this MMN again and this target S-GW sends to the amendment of this target P-GW carrying request to be sent to this target P-GW by described to client information;

This target P-GW obtains the RID of described Correspondent Node according to the described inquiry of the AID to Correspondent Node in client information received, and the gateway accessed to described Correspondent Node sends RID update notification, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

MMN in this communication network preserve according to the notice of P-GW and more new terminal to client information;

In handoff procedure, before forwarding tunnel between former P-GW and target P-GW is set up, this former P-GW encapsulates the data message solution RID issuing this terminal received and checks, will need the former MMN of opposite end message notice of this terminal upgraded, and it is described to client information that former MMN renewal is preserved; After this forwarding tunnel is set up, the data message issuing this terminal is directly transmitted to this target P-GW by this former P-GW, this target P-GW carries out solution RID encapsulation to this data message and checks, to need the opposite end message notice target MMN of this terminal upgraded, this target MMN upgrades the described to client information of preservation;

In handoff procedure, when former MMN is different from target MMN, by reorientation forward complete acknowledge message by safeguard this terminal this target MMN is sent to client information, this target MMN by receive described to client information and local preserve described client information is merged into unified to client information, according to the RID more new technological process AID of Correspondent Node in client information being initiated to opposite end after merging.

Further, said method also can have following characteristics:

The RID that this target MMN is initiated to opposite end more new technological process time, the MMN AID of Correspondent Node in client information being obtained to Correspondent Node access from this locality configuration or Correspondent Node attribution server or dns server inquiry according to this terminal, the MMN accessed to described Correspondent Node sends RID update notification, carries AID and this new RID of this terminal.

Further, said method also can have following characteristics:

This former P-GW is sent in the process of this target P-GW by this terminal of preserving to client information, and the AID-RID map information of all for this terminal Correspondent Nodes is sent to this target P-GW with described together with client information.

Further, said method also can have following characteristics:

In handoff procedure, before the forwarding tunnel between former P-GW and target P-GW is set up, this former P-GW to the data message issuing this terminal received carry out solution RID encapsulation and check, safeguard preserve this terminal to client information; This forwarding tunnel set up after, the data message issuing this terminal is directly transmitted to this target P-GW by this former P-GW, by this target P-GW to this data message carry out the RID of solutioning encapsulate and check, this locality preservation and safeguard this terminal to client information;

This target P-GW receive this terminal that former P-GW sends to after client information, by describedly unified safeguarding client information client information and local described to merge into client information of preserving of receiving.

Further, said method also can have following characteristics:

In handoff procedure, this former P-GW by with the forwarding tunnel of this target P-GW by before the transmitting to this target P-GW client information of this terminal of preserving, this former P-GW to the data message issuing this terminal received carry out solution RID encapsulation and check, safeguard preserve this terminal to client information; Transmit described to after client information, the data message forwarding issuing this terminal that receives is given this target P-GW by this former P-GW, carries out the RID of solutioning encapsulate and inspection by this target P-GW to this data message, safeguard this terminal to client information.

Further, said method also can have following characteristics:

In handoff procedure, after forwarding tunnel between this target P-GW and former P-GW is set up, the data message issuing terminal of former P-GW reception flows to and is: former P-GW-> target P-GW-> target S-GW, and data message is buffered in target S-GW; The data message issuing terminal of target P-GW reception flows to and is: target P-GW-> target S-GW, and data message will be buffered in target S-GW;

This terminal switch is to Target Wireless side network element, and this target S-GW is according to after the amendment carrying request foundation of this target MMN and the carrying of this Target Wireless side network element, then the data message of buffer memory is sent to this terminal through this Target Wireless side network element.

Further, said method also can have following characteristics:

In handoff procedure, before setting up the forwarding tunnel between this target P-GW and former P-GW, mutual by with Target Wireless side network element and target S-GW of target MMN, for this terminal sets up the tunnel between this Target Wireless side network element and this target S-GW;

In handoff procedure, after forwarding tunnel between this target P-GW and former P-GW is set up, the data message issuing terminal of former P-GW reception flows to and is: former P-GW-> target P-GW-> target S-GW-> Target Wireless side network element, and data message is buffered in the network element of Target Wireless side; The data message issuing terminal of target P-GW reception flows to and is: target P-GW-> target S-GW-> Target Wireless side network element, and data message will be buffered in the network element of Target Wireless side;

After this terminal switch to this Target Wireless side network element, the data message of buffer memory is sent to this terminal by this Target Wireless side network element.

Further, said method also can have following characteristics:

In handoff procedure, between this target P-GW and former P-GW, only set up descending forwarding tunnel; Before this terminal switch to Target Wireless side network element, the flow direction of the data message that this terminal sends is: the former P-GW of this terminal-> former wireless side network element-> former S-GW->, former P-GW carries out RID encapsulation and inspection to this data message, and that safeguards this terminal maybe will need the former MMN of opposite end message notice of this terminal upgraded to client information.

Further, said method also can have following characteristics:

In handoff procedure, this former P-GW by with the forwarding tunnel of this target P-GW by before the transmitting to this target P-GW client information of this terminal of preserving, the flow direction of the data message that this terminal sends is: the former P-GW of this terminal-> former wireless side network element-> former S-GW->, former P-GW carries out RID encapsulation and inspection to this data message, safeguard this terminal to client information;

This former P-GW transmits described to after client information and before this terminal switch to Target Wireless side network element, the flow direction of the data message that this terminal sends is this terminal-> former wireless side network element-> former S-GW-> former P-GW-> target P-GW, target P-GW carries out RID encapsulation and inspection to this data message, safeguard this terminal to client information.

Further, said method also can have following characteristics:

Target MMN or target S-GW determines target P-GW according to region, terminal position and/or network configuration information, or target MMN or target S-GW determines target P-GW according to the instruction of terminal or wireless side network element.

Further, said method also can have following characteristics, in this handoff procedure to the connection establishment of former side between terminal to packet data network and target side, discharge relevant process and comprise:

After the switching initiation of described S1 interface, after former MMN receives the handover request of former wireless side network element transmission, when this former MMN is different from target MMN, sends reorientation forwarding request message to target MMN, carry the address of former P-GW;

This target MMN carries out reorientation to S-GW and P-GW, when being reoriented to the target P-GW different from former P-GW, is initiated to the session establishment flow process of S-GW and P-GW;

This target MMN request target wireless side network element performs switching, and this Target Wireless side network element responds switching request acknowledgement message to this target MME;

When this target MMN is different from former MMN, send reorientation forward response message to former MME, former MMN notifies this terminal switch by former wireless side network element;

Notify that this target MMN switches after this Target Wireless side network element receives the switch acknowledgment message of this terminal, when this target MMN is different from former MMN, send reorientation forward completion notice message to this former MME, this former MME replys reorientation forward to this target MME and completes acknowledge message;

This target MMN request target S-GW revises beared information, and this target S-GW responds bearing modification result to this target MMN; Former network side performs former BlueDrama and deletes and forwarding tunnel release flow process, comprises the tunnel between former S-GW and former P-GW.

Further, said method also can have following characteristics:

In terminal switching process, target MME does not change the P-GW of the former access of terminal when determining target P-GW, and this target MME sends session establishment request to target S-GW, with the Tunnel Identifier that this P-GW address and this P-GW are distributed; Target S-GW sends session establishment request to P-GW, and carry the tunnel information that this target S-GW is the tunnel distributing between foundation and this P-GW, this P-GW preserves the tunnel information of former S-GW and target S-GW simultaneously, sets up the tunnel of this terminal between this P-GW and target S-GW;

In handoff procedure, after between this P-GW and target S-GW, the tunnel of this terminal is set up, the data message issuing this terminal received is transmitted to target S-GW through this tunnel by this P-GW; Or this target MME controls the forwarding tunnel set up between former S-GW or target S-GW, and the data message issuing this terminal received is issued former P-GW by this P-GW, and former P-GW is transmitted to target S-GW through this forwarding tunnel again.

Correspondingly, the communication network that chain of command provided by the invention is separated with medium surface comprises wireless side network element, IAD, and and there is between wireless side network element and IAD the mobile management node (MMN) of signaling interface, described IAD and between wireless side network element and external packet data networks, there is data-interface, for forwarding the data between wireless side network element and packet data network, it is characterized in that, also comprise the identity position register (ILR) with described IAD and/or MMN with signaling interface, wherein:

The identify label (AID) of this incision terminal, for carrying out the relevant treatment of chain of command, when determining different from a former IAD target access gateway for incision terminal, is sent to this target access gateway by described MMN;

Described IAD is used for after the AID receiving the incision terminal that target MMN transmits, the station location marker (RID) new for this terminal distribution also preserves the map information of this terminal AID and this new RID, and carries out RID encapsulation to the data message of this incision terminal, separate RID encapsulation and forward;

Described IAD or MMN also for sending registration request to incision terminal attaching ILR, carry the new RID of this incision terminal;

The RID of this incision terminal of preserving, for safeguarding the AID-RID map information of home subscriber terminal, after receiving the registration request to incision terminal, is updated to this new RID by described ILR.

Further, above-mentioned communication network also can have following characteristics:

Described IAD is also for after for the new RID of incision terminal distribution, and the RID that this is new is sent to target MMN;

Described MMN is also for after the new RID receiving incision terminal, and the gateway that the Correspondent Node to this terminal accesses sends RID update notification, carries AID and this new RID of this terminal.

Described MMN also for after determining to be different from the target access gateway of former IAD, with target access gateway and former IAD mutual, set up the forwarding tunnel cutting terminal between this target access gateway and former IAD; Or, described IAD also for by the signaling interface between IAD, for incision terminal sets up the forwarding tunnel between this IAD and former IAD;

The data message cutting out terminal of issuing received also for after this forwarding tunnel is set up, is forwarded to this target access gateway by this forwarding tunnel by described IAD; Target Wireless side network element is forwarded to again after being forwarded directly to Target Wireless side network element or buffer memory after receiving the data message issuing incision terminal;

Described Target Wireless side network element sends to this incision terminal after being used for that the data message issuing incision terminal received directly is sent to this incision terminal or buffer memory.

Described IAD also for maintenance terminal to client information, comprise the correspondence relationship information of this terminal AID and Correspondent Node AID; In handoff procedure, by safeguard cut out terminal this target access gateway is sent to client information; And for the new RID of incision terminal distribution and receive this incision terminal that former IAD sends to after client information, the gateway transmission RID update notification that the Correspondent Node to this incision terminal access, carries AID and this new RID of this terminal.

Described MMN comprises:

Cut out control module, for after S1 switches initiation, request target MMN reorientation, and the AID cutting out terminal is sent to target MMN; Notify that this cuts out terminal and performs switching by former wireless side network element, and after switching completes, perform former BlueDrama and delete and forwarding tunnel release flow process;

Incision control module, for determining target S-GW and target P-GW after receiving re-positioning request, when determining the target S-GW different from former S-GW and the target P-GW different with former P-GW, is sent to this target P-GW by the AID of incision terminal through target S-GW; And mutual with Target Wireless side network element and target S-GW, be the tunnel that incision terminal sets up between the two;

Described P-GW comprises:

Incision control module, for after the AID receiving the incision terminal that target MMN transmits and former P-GW address information, for this terminal distribution points to the new RID of this P-GW, preserves the map information of this terminal AID and this new RID;

Packet forwarding module, for carrying out RID encapsulation, separating RID encapsulation and forward process to the data message cutting, cut out terminal;

Module is set up in first tunnel, for the forwarding tunnel set up for incision terminal and between target S-GW;

Described S-GW is used for, for the foundation of incision terminal and the tunnel between target P-GW and Target Wireless side network element, carrying out data message forwarding, and transmitting information mutual between MMN and P-GW.

Described P-GW also comprises RID Registering modules; The incision control module of described P-GW also for activating this RID Registering modules after cutting the new RID of terminal distribution; This RID Registering modules is used for sending registration request to incision terminal attaching ILR, carries the AID of this incision terminal and new RID; Or

The incision control module of described P-GW is also for after the new RID for incision terminal distribution, and the RID that this is new is sent to target MMN through target S-GW; Described MMN also comprises RID Registering modules, for after the new RID receiving incision terminal, sends registration request, carry the AID of this incision terminal and new RID to incision terminal attaching ILR.

The incision control module of described MMN also for being sent to this target P-GW by the address information of former P-GW together with the AID of incision terminal;

Described P-GW also comprises the second tunnel and sets up module; Incision control module in described P-GW also for after for the new RID of incision terminal distribution, activates described second tunnel and sets up module;

Described second tunnel is set up module and is set up request for sending forwarding tunnel by the signaling interface between P-GW to former P-GW, and carrying this P-GW is the tunnel information that incision terminal is set up and between former P-GW, forwarding tunnel distributes; And, receive target P-GW send for cut out terminal set up forwarding tunnel set up request after, to target P-GW reply forwarding tunnel set up response.

Described MMN also comprises tunnel and sets up module, for after determining the target P-GW being different from former P-GW, setting up to target P-GW request the forwarding tunnel cutting terminal between former P-GW and target P-GW by target S-GW, is that the forwarding tunnel mark that this forwarding tunnel distributes is delivered to former MMN by this target P-GW; And receiving target P-GW is after the forwarding tunnel mark cutting out terminal distribution, sends forwarding tunnel and sets up request, carry this forwarding tunnel mark by former S-GW to former P-GW;

Described P-GW also comprises the second tunnel and sets up module, for receive that target MMN send for after incision terminal sets up the request of forwarding tunnel between former P-GW and target P-GW, for the forwarding tunnel of this this forwarding tunnel of incision terminal distribution identifies; And cross after forwarding tunnel sets up and ask the target P-GW that carries to be the forwarding tunnel mark cutting out terminal distribution receiving former MMN, set up and forwarding tunnel between this target P-GW, and reply forwarding tunnel by former S-GW to this former MMN and set up response.

Described P-GW also comprises opposite end maintenance of information module, cuts out control module and RID update module;

Opposite end maintenance of information module in described P-GW for preserve with maintenance terminal to client information, comprising the correspondence relationship information of terminal AID and Correspondent Node AID;

Described P-GW cut out control module for by the signaling interface between P-GW or by the signaling transmitted between former S-GW, former MMN, target MMN, target S-GW by preserve cut out terminal target P-GW is sent to client information;

The incision control module of described P-GW also for receive incision terminal that former P-GW transmits to client information and the RID new for this incision terminal distribution after, activate the RID update module in this P-GW;

RID update module in described P-GW be used for according to this terminal to the AID of Correspondent Node in client information local or obtain the RID of described Correspondent Node to ILR inquiry, the gateway accessed to described Correspondent Node sends RID update notification, carries AID and this new RID of this terminal.

Described MMN also comprises opposite end maintenance of information module and RID update module; Wherein:

Opposite end maintenance of information module in described MMN safeguards that to client information and according to the update notification of P-GW this is to client information, comprising the correspondence relationship information of terminal AID and Correspondent Node AID for what preserve terminal;

In described MMN cut out control module also for completed by reorientation forward acknowledge message by preserve cut out terminal target MMN is sent to client information;

Incision control module in described MMN also at the new RID receiving the incision terminal that target P-GW sends, and former MMN is transmitted with this incision terminal of local maintenance client information is merged after, activate the RID update module in this MMN;

RID update module in described MMN is used for the AID to Correspondent Node in client information according to incision terminal, inquire the address information of the MMN of Correspondent Node access, the MMN accessed to the Correspondent Node of this terminal sends RID update notification, carries AID and this new RID of this terminal.

Described P-GW cuts out before control module also sets up for the forwarding tunnel between this P-GW and target P-GW, the data message solution RID cutting out terminal that issues received is encapsulated and checked, send out opposite end information updating notice to former MMN, carry this that need to upgrade cut out terminal to client information; After this forwarding tunnel is set up, be directly transmitted to target P-GW by issuing this data message cutting out terminal;

After the incision control module of described P-GW is also set up for the forwarding tunnel between this P-GW and former P-GW, solution RID encapsulation is carried out to the data message issuing incision terminal and checks, send opposite end information updating notice to target MMN, carry this incision terminal needing to upgrade to client information.

Before the forwarding tunnel of packet forwarding module between this P-GW and target P-GW of described P-GW is set up, the data message cutting out terminal of issuing received is carried out solution RID encapsulation and checked, be transmitted to target P-GW again, and this needing to upgrade is cut out the opposite end maintenance of information module of opposite end this P-GW of message notice of terminal, after this forwarding tunnel is set up, be directly transmitted to target P-GW by issuing this data message cutting out terminal; And, after forwarding tunnel between this P-GW and former P-GW is set up, solution RID encapsulation carried out to the data message issuing incision terminal and checks, being forwarded to target S-GW, and will the opposite end maintenance of information module of opposite end this P-GW of message notice of this incision terminal upgraded be needed;

Opposite end maintenance of information module in described P-GW also for receive incision terminal that former P-GW sends to client information after, by merging client information of this incision terminal of preserving with this locality received, and safeguarding client information after being combined.

Described P-GW cut out control module by the signaling interface between P-GW by preserve cut out terminal target P-GW is sent to client information, and notify the packet forwarding module of this P-GW; And receive the preserving after client information of incision terminal that former P-GW transmits, and notify the packet forwarding module of this P-GW;

The packet forwarding module of described P-GW described client information transmitted before, the data message cutting out terminal of issuing received is carried out the RID of solutioning encapsulation and is checked, this needing renewal is cut out the opposite end maintenance of information module of opposite end this P-GW of message notice of terminal; Described to client information transmit after, this data message cutting out terminal of issuing received directly is transmitted to this target P-GW; And, receive incision terminal that former P-GW transmits to client information after, the RID of solutioning encapsulation is carried out to the data message issuing this incision terminal and checks, this needing renewal is cut out the opposite end maintenance of information module of opposite end this P-GW of message notice of terminal.

After the forwarding tunnel of packet forwarding module between this P-GW and target P-GW of described P-GW is set up, the data message forwarding that issuing of receiving is cut out terminal is to target P-GW; And, after receiving the data message issuing incision terminal, be transmitted to target S-GW;

Described S-GW receive target P-GW forward issue incision terminal data message after advanced row cache, after setting up the carrying with Target Wireless side network element according to the amendment carrying request of target MMN, then the data message of buffer memory is sent to this incision terminal through this Target Wireless side network element.

The incision control module of described MMN is before controlling to set up the forwarding tunnel between target P-GW and former P-GW, and mutual by with Target Wireless side network element and target S-GW, for incision terminal sets up the carrying between this Target Wireless side network element and this target S-GW;

Described S-GW receive target P-GW forward issue incision terminal data message after be transmitted to Target Wireless side network element;

Described Target Wireless side network element is advanced row cache after receiving the data message issuing incision terminal, after this incision terminal switch to this Target Wireless side network element, the data message of buffer memory is sent to this terminal.

The packet forwarding module of described P-GW is after receiving the data message cutting out terminal transmission, RID encapsulation and inspection are carried out to this data message, by this data message forwarding to packet data network, and to this P-GW or former MMN opposite end maintenance of information module send update notification, carry need upgrade this cut out terminal to client information; Or

The packet forwarding module of described P-GW is after receiving the data message cutting out terminal transmission, directly by this data message forwarding to target P-GW, and, RID encapsulation and inspection is carried out after the data message receiving the incision terminal transmission that former P-GW sends, by this data message forwarding to packet data network, and to this P-GW or target MMN opposite end maintenance of information module send update notification, carry need upgrade this incision terminal to client information.

Described target MMN or target S-GW determines target P-GW according to region, terminal position and/or network configuration information, or

Target MMN or target S-GW determines target P-GW according to the instruction of terminal or wireless side network element.

Incision control module in described P-GW after for the new RID of incision terminal distribution, is sent to target MME to client information through target S-GW also by this new RID and this incision terminal;

Described MME also comprises RID update module; The incision control module of described MME receive incision terminal to client information after, activate the RID update module of this MME; The RID update module of described MME is used for the AID to Correspondent Node in client information according to incision terminal, inquire the address information of the MME of Correspondent Node access, the MME accessed to the Correspondent Node of this terminal sends RID update notification, carries AID and this new RID of this terminal.

The mode that the present invention adopts identify label to be separated with station location marker is to realize the mobility of unanchored mode in wireless communication system, thus solve in existing communication network the variety of problems that fixed anchor point mechanism can only be adopted to bring, avoid the phenomenon that mobile rear data are roundabout, reduce transmission delay and bandwidth waste, effectively improve terminal travelling performance in a wireless communication system.

Accompanying drawing explanation

Accompanying drawing illustrates and is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 a is cordless communication network connection diagram in prior art;

Fig. 1 b is that in prior art, cordless communication network switches schematic diagram across S-GW;

Fig. 1 c is the switching flow figure that in prior art, terminal adopts fixed anchor point mode;

Fig. 1 d is the network topology schematic diagram of embodiment of the present invention SILSN framework;

Fig. 2 is the connection diagram that the present invention adopts the first EPS network of SILSN framework;

Fig. 3 is the connection diagram that the present invention adopts the second EPS network of SILSN framework;

Fig. 4 is the connection diagram that the present invention adopts the third EPS network of SILSN framework;

Fig. 5 is switching flow figure mono-provided by the invention, and a kind of handoff procedure across P-GW is shown;

Fig. 5 a is switching flow figure bis-provided by the invention, and handoff procedure when a kind of P-GW is constant is shown;

Fig. 6 is switching flow figure tri-provided by the invention, and the another kind of handoff procedure across P-GW is shown;

Fig. 7 is switching flow figure tetra-provided by the invention, and the another kind of handoff procedure across P-GW is shown;

Fig. 8 is switching flow figure five provided by the invention, and the another kind of handoff procedure across P-GW is shown;

Fig. 9 is switching flow figure six provided by the invention, and the another kind of handoff procedure across P-GW is shown;

Figure 10 is switching flow figure seven provided by the invention, and handoff procedure when another kind of P-GW is constant is shown.

Figure 11 is the module map that the invention provides P-GW in the EPS network corresponding to Fig. 4.

Embodiment

Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can implement according to this, but illustrated embodiment is not as a limitation of the invention.

The network that above-mentioned SILSN framework applications is separated in chain of command with medium surface by the present invention, realizes switching without fixed anchor point.The SILSN framework recorded according to background technology and operation principle thereof can be understood, and when the switching across ASN occurs fast mobile terminal, the target ASN of incision side will be terminal distribution RID, initiates registration to this terminal attaching ILR; The source ASN cutting out side will delete the AID-RID map information of this terminal, and safeguards the AID-RID map information of all Correspondent Nodes of this terminal.In order to enable Correspondent Node send to the message of this terminal to be routed to target ASN rapidly, RID update notification can be sent to the gateway of Correspondent Node access.Source ASN can also transmit the AID-RID map information to client information and/or all Correspondent Nodes of this terminal to target ASN.In addition, in handoff procedure, source ASN needs to forward to target ASN the message that Correspondent Node sends to this terminal.

Below based on EPS network, proposing the EPS network that three kinds adopt SILSN frameworks, being described mainly for the improvement carried out on original system being separated needs for realizing terminal identity mark with position.Needing the network element of upgrading as in P-GW, MME, be separated relevant functional module to the identify label realizing terminal with position except what hereafter mention, need to be retained in EPS other functional modules original, hereinafter just illustrate no longer one by one.

Wen Zhong, the network element accessed by Correspondent Node is referred to as opposite end network element.

The network architecture one

The first has the framework of the EPS network of SILSN framework as shown in Figure 2, gives the connecting interface between main network elements in this architecture network and each network element in figure.

The Access Network part of SILSN framework realizes primarily of the wireless access network in EPS network, and MME, S-GW in EPS network and the P-GW after upgrading realizes the function that ASN will complete jointly.Meanwhile, add the ILR had with the interface of P-GW, the network elements such as PTF, these network elements are logical ne, physical entity can close with existing network element and establish.The support RID route that P-GW is connected to, the packet data network (PDN) of forwarding form broad sense Forwarding plane.There is signaling interface between P-GW and ILR, there is not signaling interface between MME and ILR, the process relevant with AID, RID mainly realizes in P-GW.

Wherein:

P-GW is used for providing access service for terminal, for terminal distribution RID, to ILR registration (also referred to as registering) and the RID nullifying (registering also referred to as cancelling) terminal, to the RID of ILR query communication opposite end, maintenance terminal to client information, the AID-RID map information of maintenance terminal and Correspondent Node thereof, RID update notification is sent to peer gateway, RID encapsulation is carried out to data message, separates RID encapsulation and forward, and coordinate with other network elements and realize the switching of terminal across P-GW.The RID that P-GW distributes points to this P-GW, if RID can be the IP address of P-GW.AID is terminal distribution when then can carry out signing on home subscriber server, as being IPV6/IPV4 address or IMSI or temporary mark or NAI.Other frameworks also herewith.

Under this architecture, the maintenance to client information of terminal also can complete by MME, or is jointly completed by P-GW and MME.Correspondingly, the function to peer gateway transmission RID update notification also can have been come by MME.

The function of ILR, PTF of mapping forward plane as described above.

The network architecture two

The second has the framework of the EPS network of SILSN framework as shown in Figure 3, gives the connecting interface between the main network elements of this architecture network and each network element in figure.The Access Network part of SILSN framework realizes primarily of the wireless access network in EPS, and the S-GW in EPS, P-GW and MME after upgrading realizes the function that ASN will complete jointly.Meanwhile, the ILR between P-GW with interface is added, the network elements such as PTF.These network elements are logical ne, physical entity can close with existing network element and establish, and the support RID route that P-GW is connected to, the packet data network (PDN) of forwarding form broad sense Forwarding plane.All signaling interface is there is between ILR and P-GW and between ILR and MME.Partial function changes to have been come by MME.

Wherein:

P-GW, for being terminal distribution RID, to the RID of ILR query communication opposite end, the AID-RID map information of maintenance terminal and Correspondent Node thereof, RID encapsulation is carried out to data message, separates RID encapsulation and forward, and coordinate with other network elements and realize the switching of terminal across P-GW.

MME, for the RID to ILR registration and unregistration terminal, coordinates with other network elements and realizes the switching of terminal across P-GW.

The maintenance to client information of terminal also can MME, or P-GW and MME completes jointly.The function sending RID update notification to peer gateway can have been come by MME or P-GW.

The function of ILR, PTF of mapping forward plane as described above.

The network architecture three

The second has the framework of the EPS network of SILSN framework as shown in Figure 4, gives the connecting interface between the main network elements of this architecture network and each network element in figure.In this framework, between P-GW and ILR, there is not signaling interface, between MME and ILR, there is signaling interface.

The Access Network part of SILSN framework realizes primarily of the wireless access network in EPS, and the S-GW in EPS and P-GW, MME after upgrading realize the function that ASN will complete jointly.Meanwhile, add the network elements such as the PTF between P-GW with interface, and and MME between there is the ILR of signaling interface.These network elements are logical ne, physical entity can close with existing network element and establish, and the PDN of the support RID route that P-GW is connected to, forwarding forms broad sense Forwarding plane.Owing to not having interface between ILR and P-GW, compared with framework two, P-GW needs need be increased by the RID of MME to ILR query communication opposite end, MME to return the function of Query Result according to the request of P-GW to ILR query communication opposite end RID.Other functions of P-GW and MME, with framework two, no longer repeat.

The function of ILR, PTF of mapping forward plane as described above.

The above network architecture is all carry out illustrated with the situation that terminal is non-roaming, and when terminal is roamed, P-GW or S-GW needs by the ILR/PTF of visited place and the ILR/PTF on terminal attaching ground mutual, does not affect terminal switch flow process hereafter.

Be further described based on the handoff procedure of the above-mentioned network architecture to terminal below, to original content of message original in handoff procedure, no longer describe in detail.

Fig. 5 shows on the basis of the network architecture shown in Fig. 2, terminal carries out the flow process switched across P-GW, determine the target P-GW being different from former P-GW, two P-GW set up data forwarding channel alternately by the signaling interface between P-GW, and the concrete steps of this flow process are as follows:

Step 501, wireless side network element judges that needing to send S1 switches;

Step 502, former wireless side network element sends handover request to former MME;

Step 503, the reorientation forwarding request message that former MME is sending to target MME, with the AID of former P-GW address and terminal;

Step 504, target MME sends session establishment request to target S-GW, the AID of tape terminal, former P-GW address and the target P-GW address determined, does not need the Tunnel Identifier distributed with former P-GW.Target S-GW sends session establishment request to this target P-GW, the AID of tape terminal and former P-GW address;

Target S-GW also can carry the tunnel information into setting up the tunnel distributing between target P-GW to the request of this target P-GW transmission session establishment.

In each embodiment, target MME can according to local policy (as region, terminal position and/or network configuration information, the band of position is as being LAI, RAI, TAI or wireless side NE ID etc.) determine target P-GW, also can determine target P-GW according to the instruction of terminal or wireless side network element.As in one example, can according to the band of position of terminal, this terminal of chosen distance nearest and be the GGSN belonging to same APN.In another embodiment, also target P-GW can be determined by target S-GW and notification target MME.

Step 505, target P-GW is RID that terminal distribution is new and preserves the map information of this terminal AID and this new RID;

Step 506, target P-GW initiates RID registration, and the RID of this terminal of being preserved by this terminal attaching ILR is updated to new RID;

When target side network element initiates RID registration, RID registration request is sent to terminal attaching ILR, carry this terminal AID and new RID, after this ILR receives, the RID in this terminal AID-RID map information preserved is updated to this new RID, also namely have updated the AID-RID map information of this terminal.

The tunnel Establishing process of the register flow path in this step and step 507 is without inevitable sequencing.

Step 507, target P-GW sends forwarding tunnel to former P-GW and sets up request, asks the uplink and downlink forwarding tunnel set up between former P-GW and target P-GW, carries the tunnel information distributed for setting up this uplink and downlink forwarding tunnel;

Step 508, former P-GW replys target P-GW forwarding tunnel and sets up response, carry this terminal to client information, alternatively, also carry the AID-RID map information of this terminal;

Step 509, target P-GW is according to the AID to Correspondent Node in client information of this terminal, the gateway finding Correspondent Node access (is called for short peer gateway, as P-GW, also may be that other gateways are as ISN), send RID update notification to peer gateway, carry the AID of this terminal and new RID;

After peer gateway receives, the RID in the AID-RID map information of this terminal can be updated to this new RID.

After this step, data flow is as follows:

The flow direction of what former P-GW received the issue downlink data message of this terminal is: former P-GW-> target P-GW-> target S-GW, data will be buffered in target S-GW.

After this step, more the data mailing to terminal can be directly sent to target P-GW by the opposite end P-GW of new terminal RID, the downlink data of this terminal that what target P-GW received issue flows to and is: target P-GW-> target S-GW, data will be buffered in target S-GW.

The uplink data messages that terminal sends flows to: terminal-> former wireless side network element-> former S-GW-> former P-GW-> target P-GW, when Correspondent Node is linked into another P-GW, target P-GW is forwarded to packet data network again.

Step 510, target P-GW replys session establishment response message to target S-GW, and carry the tunnel information into setting up tunnel distributing between target S-GW, target S-GW replys session establishment response message to target MME;

P-GW receives session establishment request, for this terminal distribution and between target S-GW tunnel tunnel information after just can reply session establishment response message to target S-GW, there is no necessary sequencing with step 505 to 509.

Step 511, target MME request target wireless side network element performs switching;

Step 512, Target Wireless side network element responds switching request acknowledgement message to target MME, does not need to carry forwarding tunnel information;

Step 513, target MME sends reorientation forward response message to former MME;

Step 514, former MME sends switching command to former wireless side network element;

Step 515, former wireless side network element sends switching command to terminal;

Step 516, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 517, Target Wireless side network element notification target MME switches;

Step 518, target MME sends reorientation forward completion notice message to former MME;

Step 519, former MME replys reorientation forward to target MME and completes acknowledge message;

Step 520, target MME request target S-GW revises beared information, and target S-GW does not send amendment bearing request message to P-GW;

Step 521, target S-GW responds bearing modification result to target MME;

Step 522, perform former BlueDrama and delete and forwarding tunnel release flow process, this flow process can be triggered by timer by former P-GW.

In above-mentioned flow process, target S-GW finds it is the switching across P-GW in step 504, then need the downlink data of the follow-up arrival of buffer memory, until downlink data is just mail to terminal by step 520.

After having switched, the forward-path of uplink data messages is: terminal-> Target Wireless side network element-> target S-GW-> target P-GW, target P-GW carries out RID encapsulation and forwarding to message, is routed to peer gateway through PDN.The forward-path of downlink data message is: target P-GW-> target S-GW-> Target Wireless side network element-> terminal, and target P-GW carries out solution RID encapsulation to message.Therefore achieve the switching without fixed anchor point, avoid route roundabout.Other target P-GW embodiment different from source P-GW forward-path after handover all herewith.

In above-mentioned flow process, after the forwarding tunnel between former P-GW and target P-GW is set up, former P-GW and target P-GW, and can in the following ways to the respective handling of data message to the maintenance of client information and transmission:

Mode one, the same time only by a P-GW maintenance terminal to client information.

Former P-GW to be transmitted to target P-GW by forwarding tunnel terminal to client information before, carried out being forwarded to target P-GW again after the RID of solutioning encapsulates and checks to downlink data message by former P-GW, former P-GW continue to safeguard preservation this to client information.Former P-GW to target P-GW transmit terminal to after client information, be forwarded directly to target P-GW after receiving downlink data message, no longer carry out decapsulation and inspection; Target P-GW receives this to before client information, directly the downlink data message received is forwarded to target S-GW, receives this to after client information, also will carry out solution RID encapsulation to this downlink data message and check, preserve, safeguard that this is to client information.

When safeguarding client information, as checked by real-time streams testing mechanism or to AID in data message, add the AID of the new Correspondent Node found to this in client information, to be detected by real-time streams or opposite end notice is known when having Correspondent Node off-line, delete AID to this Correspondent Node in client information, each network element is to being similar to the maintenance mode of client information.

Correspondingly, former P-GW by this to client information to target P-GW transmit before, the flow direction of the data message that this terminal sends is: the former P-GW of this terminal-> former wireless side network element-> former S-GW->, former P-GW carries out RID encapsulation and inspection to this data message, with safeguard this terminal to client information; This former P-GW transmits described to after client information and before this terminal switch to Target Wireless side network element, the flow direction of the data message that this terminal sends is this terminal-> former wireless side network element-> former S-GW-> former P-GW-> target P-GW, target P-GW carries out RID encapsulation and inspection to this data message, safeguard this terminal to client information.

Mode two, was safeguarded client information by former side and target side P-GW in certain period simultaneously.

After forwarding tunnel is set up, former P-GW is forwarded directly to target P-GW after receiving downlink data message, continue to safeguard simultaneously this terminal to client information, target P-GW carries out solution RID encapsulation to the downlink data message received and forwards after checking again, preserve in this locality, safeguard this terminal to client information.This stage be by former P-GW and target P-GW safeguard simultaneously this terminal to client information.Target P GW receive former P-GW transmit this terminal to after client information, by receive with this locality preserve this terminal to client information merge, client information is safeguarded after being combined afterwards.

Correspondingly, before this terminal switch to Target Wireless side network element, the flow direction of the uplink data messages that this terminal sends is: the former P-GW of this terminal-> former wireless side network element-> former S-GW->, former P-GW carries out RID encapsulation and inspection to this data message, and that safeguards this terminal of preserving maybe will need the former MME of opposite end message notice of this terminal upgraded to client information.Now, only need to set up and down forward tunnel between this former P-GW to target P-GW.Each flow process in literary composition all herewith.

Above under various mode, P-GW maintenance terminal to client information time, can the AID-RID map information of the simultaneously Correspondent Node of maintenance terminal, as preserved the AID-RID map information of the Correspondent Node also do not preserved in data message, preserve the AID-RID map information etc. of the Correspondent Node inquired.

Correspondingly, the present embodiment based on communication system in, S-GW is used for, for incision terminal sets up tunnel between S-GW and target P-GW and S-GW and Target Wireless side network element, carrying out data message forwarding, and transmitting information mutual between MME and P-GW.And MME with the P-GW functional module relevant to switching is as follows:

MME comprises:

Cut out control module, for after S1 switches initiation, request target MME reorientation, and the address information of the AID and former P-GW that cut out terminal is sent to target MME; Notify that this cuts out terminal and performs switching by former wireless side network element, and after switching completes, perform former BlueDrama and delete and forwarding tunnel release flow process.

Incision control module, for determining target S-GW and target P-GW after receiving re-positioning request, when determining the target S-GW different from former S-GW and the target P-GW different with former P-GW, the AID of incision terminal and former P-GW address information are sent to this target P-GW through target S-GW; And mutual with Target Wireless side network element and target S-GW, be the tunnel that incision terminal sets up between the two.

As shown in figure 11, P-GW comprises:

Cut out control module, for by the signaling interface between P-GW by preserve cut out terminal target P-GW is sent to client information.

Incision control module, for after the AID receiving the incision terminal that target MME transmits and former P-GW address information, for this terminal distribution points to the new RID of this P-GW, preserve the map information of this terminal AID and this new RID, activate RID Registering modules, module is set up in the first tunnel and module is set up in the second tunnel, receive incision terminal that former P-GW transmits to client information after RID update module in this P-GW of reactivation, and packet forwarding module to be controlled.

Packet forwarding module, for carrying out RID encapsulation, separating RID encapsulation and forward process to the data message cutting, cut out terminal; After forwarding tunnel between this P-GW and target P-GW is set up, the data message forwarding that issuing of receiving is cut out terminal is to target P-GW; After receiving the data message issuing incision terminal, be transmitted to target S-GW.

Module is set up in first tunnel, for the forwarding tunnel set up for incision terminal and between target S-GW.

Module is set up in second tunnel, sets up request for sending forwarding tunnel by the signaling interface between P-GW to former P-GW, and carrying this P-GW is the tunnel information that incision terminal is set up and between former P-GW, forwarding tunnel distributes; And, receive target P-GW send for cut out terminal set up forwarding tunnel set up request after, to target P-GW reply forwarding tunnel set up response.

RID Registering modules, for sending registration request to incision terminal attaching ILR, carries the AID of this incision terminal and new RID.

Opposite end maintenance of information module, for preserve with maintenance terminal to client information, comprising the correspondence relationship information of terminal AID and Correspondent Node AID.

RID update module, for according to this terminal to the AID of Correspondent Node in client information local or obtain the RID of Correspondent Node to ILR inquiry, the gateway to Correspondent Node access sends RID update notification, carries AID and this new RID of this terminal.

To the maintenance of client information and transmission, and adopt mode for the moment to the respective handling of data message, have:

P-GW cut out control module by the signaling interface between P-GW by preserve cut out terminal target P-GW is sent to client information, and notify the packet forwarding module of this P-GW; And receive the preserving after client information of incision terminal that former P-GW transmits, and notify the packet forwarding module of this P-GW;

The packet forwarding module of P-GW is at down direction, before client information is transmitted, the data message cutting out terminal of issuing received is carried out solution RID encapsulation and checked, this needing to upgrade is cut out the opposite end maintenance of information module of opposite end this P-GW of message notice of terminal; After client information is transmitted, this data message cutting out terminal of issuing received directly is transmitted to this target P-GW; And, receive incision terminal that former P-GW transmits to client information after, the RID of solutioning encapsulation is carried out to the data message issuing this incision terminal and checks, this needing renewal is cut out the opposite end maintenance of information module of opposite end this P-GW of message notice of terminal.At up direction, after receiving the data message cutting out terminal transmission, directly by this data message forwarding to target P-GW, and, RID encapsulation and inspection is carried out after the data message receiving the incision terminal transmission that former P-GW sends, by this data message forwarding to packet data network, and to this P-GW opposite end maintenance of information module send update notification, carry need upgrade this incision terminal to client information.

To the maintenance of client information and transmission, and when mode two adopts to the respective handling of data message, have:

The packet forwarding module of P-GW is at down direction, before forwarding tunnel between this P-GW and target P-GW is set up, the data message cutting out terminal of issuing received is carried out solution RID encapsulation and checked, be transmitted to target P-GW again, and this needing to upgrade is cut out the opposite end maintenance of information module of opposite end this P-GW of message notice of terminal, after this forwarding tunnel is set up, be directly transmitted to target P-GW by issuing this data message cutting out terminal; And, after forwarding tunnel between this P-GW and former P-GW is set up, solution RID encapsulation carried out to the data message issuing incision terminal and checks, being forwarded to target S-GW, and will the opposite end maintenance of information module of opposite end this P-GW of message notice of this incision terminal upgraded be needed.At up direction, after receiving the data message cutting out terminal transmission, RID encapsulation and inspection are carried out to this data message, by this data message forwarding to packet data network, and to this P-GW or former MME opposite end maintenance of information module send update notification, carry need upgrade this cut out terminal to client information.

Opposite end maintenance of information module in P-GW also for receive incision terminal that former P-GW sends to client information after, by merging client information of this incision terminal of preserving with this locality received, and safeguarding client information after being combined.

The correlating event need known when above-mentioned packet forwarding module E-Packets, as tunnel foundation, forwarding tunnel foundation, the transmission to client information, the reception etc. to client information, notifies by cutting control module or cutting out control module.

If after fast mobile terminal, P-GW remains unchanged.Flow process corresponding to this scene as shown in Figure 5 a, compared with Fig. 5, no longer set up the data forwarding channel between P-GW, target P-GW is without the need to being the new RID of terminal distribution, without the need to proceeding to the RID registration of ILR and the RID more new technological process to opposite end, and this P-GW needs the tunnel information simultaneously preserving former S-GW and target S-GW.Other process are similar with the flow process of above-mentioned Fig. 5, comprising:

Step 5a01, wireless side network element judges that needing to send S1 switches.

Step 5a02, former wireless side network element sends handover request to former MME.

The reorientation forwarding request message that step 5a03, former MME send to target MME, carries the Tunnel Identifier of P-GW address and distribution thereof;

Step 5a04, target MME send session establishment request to target S-GW, the Tunnel Identifier that band P-GW address and this P-GW distribute; Target S-GW sends session establishment request to P-GW, and carry the tunnel information that S-GW is the tunnel distributing between foundation and P-GW, P-GW preserves the tunnel information of former S-GW and target S-GW simultaneously;

In this step, target P-GW is former P-GW, in this flow process, be just called P-GW.The Tunnel Identifier that the P-GW carried in the session establishment request that target MME sends to target S-GW distributes can be for this terminal is set up and the new Tunnel Identifier of tunnel distributing between target S-GW, is the Tunnel Identifier of the tunnel distributing between the foundation of this terminal and former S-GW before also can being.

Now, data flow is described below:

Downlink data flows to: P-GW-> target S-GW, data will be buffered in target S-GW.

Upstream data flows to: terminal-> former wireless side network element-> former S-GW-> P-GW.

Step 5a10, P-GW reply session establishment response message to target S-GW, and target S-GW replys session establishment response message to target MME.

Step 5a11, target MME request target wireless side network element performs switching.

Step 5a12, Target Wireless side network element responds switching request acknowledgement message to target MME, does not need to carry forwarding tunnel information.

Step 5a13, target MME send reorientation forward response message to former MME.

Step 5a14, former MME send switching command to former wireless side network element.

Step 5a15, former wireless side network element sends switching command to terminal.

Step 5a16, terminal sends switch acknowledgment message to Target Wireless side network element.

Step 5a17, Target Wireless side network element notification target MME switches.

Step 5a18, Target Wireless side network element sends reorientation forward completion notice message to former MME.

Step 5a19, former MME reply reorientation forward to target MME and complete acknowledge message.

Step 5a20, target MME request target S-GW revises beared information, and target S-GW does not send amendment bearing request message to P-GW.

Step 5a21, target S-GW respond bearing modification result to target MME.

Step 5a22, perform former BlueDrama and delete and forwarding tunnel release flow process, this flow process can be triggered by timer by former P-GW.

Above-mentioned flow chart 5a adopt P-GW preserve terminal to client information, without the need to carrying out the transmission to client information.If by MME preserve terminal to client information, former MME to need the opposite end information band of this terminal in step 5a19 to target MME, and in handoff procedure, P-GW is before setting up the data channel with target MME, data message is encapsulated, decapsulation and inspection (also can flow real-time detection), to the opposite end message notice of this terminal upgraded be needed to former MME, after setting up the data channel with target MME, the opposite end message notice of this terminal upgraded then will be needed to target MME, target MME preserve in this locality and safeguard this terminal to client information; Target MME receive that former MME sends to after client information, by merging client information of this terminal of preserving with this locality sent, continue to safeguard after merging to client information.

This flow process is also suitable for Fig. 3, the network architecture shown in Fig. 4.

Fig. 5 a flow process is compared with existing procedure, tunnel between P-GW and target S-GW just starts to set up after target S-GW receives session establishment request, in handoff procedure, the downlink data of terminal is directly sent to target S-GW by P-GW, forwards without the need to the tunnel between S-GW.

Fig. 6 shows on the basis of the network architecture two shown in Fig. 3 or Fig. 4, and terminal carries out the flow process across P-GW handoff procedure.In this flow process, target P-GW is different from former P-GW, sets up data forwarding channel by the interface between P-GW, initiates RID register by MME.Concrete steps are described below:

Step 601-605, with step 501-505;

Step 606, target P-GW sends forwarding tunnel to former P-GW and sets up request, and the uplink and downlink forwarding tunnel of this terminal between former P-GW and target P-GW is set up in request, carries corresponding tunnel information;

Step 607, former P-GW replys target P-GW forwarding tunnel and sets up response, carry this terminal to client information, alternatively, go back the AID-RID map information of carried terminal;

Now, data flow is described below:

The downlink data message of terminal that what former P-GW received issue flows to and is: former P-GW-> target P-GW-> target S-GW, data will be buffered in target S-GW.

The flow direction of the uplink data messages that terminal sends is: the former P-GW of terminal-> former wireless side network element-> former S-GW->.

Step 608, target P-GW replys session establishment response message to target S-GW, carry the new RID of this terminal and this terminal to client information; Target S-GW replys session establishment response message to target MME, carry the new RID of this terminal and this terminal to client information;

Step 609, target MME initiates RID registration, and the RID of this terminal of being preserved by this terminal attaching ILR is updated to new RID;

Step 610, target MME request target wireless side network element performs switching;

This step performs after step 608, with step 609 without inevitable precedence relationship.

Step 611, target MME finds the address information of opposite end MME according to this terminal to the AID of Correspondent Node in client information, sends RID update notification, carry the AID of this terminal and new RID to opposite end MME;

Target MME can according to the AID of Correspondent Node, and the server (as HSS, ILR) belonged to from this locality configuration or Correspondent Node or dns server inquire the address information of opposite end MME.The AID of this terminal in this RID update notification and new RID is needed to pass to peer gateway after opposite end MME receives, after peer gateway receives, RID in the AID-RID map information of this terminal of preserving is updated to this new RID, is also equivalent to the AID-RID map information that have updated this terminal.

Now, the Correspondent Node that target P-GW receives issue terminal downlink data message flow to be: target P-GW-> target S-GW, data will be buffered in target S-GW, until step 620 just mails to terminal.

This step performs after step 608, and with step 609,610 without inevitable precedence relationship.

Step 612, Target Wireless side network element responds switching request acknowledgement message to target MME, does not need to carry forwarding tunnel information;

Step 613-622, with step 513-522.

Above-mentioned flow process can have a variants, is namely sent to the RID more new technological process of opposite end by target P-GW instead of target MME, now, after step 607, can performs:

Step 607a, target P-GW is according to the AID to Correspondent Node in client information of this terminal, search or find to ILR the RID of Correspondent Node in this locality after, send RID update notification to opposite end P-GW (also may be that other gateways are as ISN), carry the AID of this terminal and new RID.

Correspondingly, without the need to performing the step 611 in above-mentioned flow process, and at the session establishment response message that target P-GW replys to target S-GW, and in the target S-GW session establishment response message of replying to target MME without the need to carry this terminal to client information.

Above-mentioned flow process be preserved by P-GW and maintenance terminal to client information, in handoff procedure, aforesaid way one or mode two can be adopted to safeguard client information and the process carrying out data message.During employing mode two, only need set up former P-GW and down forward tunnel to target P-GW.

The functional module of P-GW with MME that the functional module that P-GW with MME corresponding to above-mentioned flow process is correlated with switching is corresponding with Fig. 5 flow process is substantially identical, and difference is the function that RID registration is relevant with RID renewal, and in above-mentioned flow process, these two functions have been come by MME.Particularly:

P-GW does not have RID Registering modules and RID update module;

Incision control module in P-GW after for the new RID of incision terminal distribution, is sent to target MME to client information through target S-GW also by this new RID and this incision terminal of receiving.

The incision control module of MME receive this new RID and this incision terminal to client information after, activate RID Registering modules and the RID update module of this MME;

The RID Registering modules of MME, for after the new RID receiving incision terminal, sends registration request to incision terminal attaching ILR, carries the AID of this incision terminal and new RID;

The RID update module of MME, for the AID to Correspondent Node in client information according to incision terminal, inquire the address information of the MME of Correspondent Node access, the MME that the Correspondent Node to this terminal accesses sends RID update notification, carries AID and this new RID of this terminal.

Fig. 7 shows on the basis of the network architecture shown in Fig. 2, and terminal carries out the flow process across P-GW handoff procedure.Do not have signaling interface between P-GW, set up the data forwarding channel between former P-GW and target P-GW by MME, data buffer storage is at S-GW.Concrete steps are described below:

Step 701-706, with step 501-506;

Step 707, target P-GW replys session establishment response message to target S-GW, and target S-GW replys session establishment response message to target MME;

Step 708, target MME request target wireless side network element performs switching;

Step 709, Target Wireless side network element responds switching request acknowledgement message to target MME, does not need to carry forwarding tunnel information;

Step 710, target MME sends forwarding tunnel to target S-GW and sets up request, and target S-GW sends forwarding tunnel to target P-GW and sets up request, and request is set up and down forwarded tunnel between former P-GW and target P-GW, after target P-GW receives, for this down forwards tunnel distributing forwarding tunnel mark;

Step 711, target P-GW replys target S-GW forwarding tunnel and sets up response, and carry described forwarding tunnel mark, target S-GW replys target MME forwarding tunnel and sets up response, carries described forwarding tunnel mark;

In another embodiment, the forwarding tunnel that can be come in forwarding step 710 by the session establishment request message of step 704 sets up request, correspondingly, message content forwarding tunnel in step 711 being set up response transmits as forwarding tunnel mark is placed in the session establishment response message of step 707, now can cancellation step 710 and 711.

Step 712, target MME sends reorientation forward response message to former MME;

Step 713, former MME sends forwarding tunnel to former S-GW and sets up request, and former S-GW sends forwarding tunnel to former P-GW and sets up request, and request is set up and down forwarded tunnel between former P-GW and target P-GW, carries the described forwarding tunnel mark that target P-GW distributes;

This flow process also can set up forwarded upstream tunnel between former P-GW and target P-GW for this terminal, and target P-GW is this forwarded upstream tunnel distributing forwarding tunnel mark, and is sent to former P-GW.

Step 714, former P-GW replys former S-GW forwarding tunnel and sets up response, former S-GW replys former MME forwarding tunnel and sets up response, carry this terminal to client information, the AID-RID map information of all right all Correspondent Nodes of carried terminal, former MME buffer memory receive to client information, or to client information and AID-RID map information;

Now, data flow is as follows:

The downlink data message issuing terminal of former P-GW reception flows to and is: former P-GW-> target P-GW-> target S-GW, data will be buffered in target S-GW.

The downlink data message issuing terminal of target P-GW reception flows to and is: target P-GW-> target S-GW, data will be buffered in target S-GW.

The flow direction of the uplink data messages that terminal sends is: the former P-GW of terminal-> former wireless side network element-> former S-GW->, is forwarded again also be fine by former P-GW through target P-GW.

Step 715, former MME sends switching command to former wireless side network element;

Step 716, former wireless side network element sends switching command to terminal;

Step 717, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 718, Target Wireless side network element notification target MME switches;

Step 719, target MME sends reorientation forward completion notice message to former MME;

Step 720, former MME replys reorientation forward to target MME and completes acknowledge message, carry this terminal to client information, also can carry the AID-RID map information of all Correspondent Nodes of this terminal;

Step 721, target MME sends amendment bearing request message to target S-GW, target S-GW sends amendment bearing request message to P-GW, all carry this terminal to client information, alternatively, in these two amendment bearing request message, also carry the AID-RID map information of all Correspondent Nodes of this terminal;

Step 722, target P-GW according to this terminal to client information, search or find to ILR the RID of opposite end in this locality after, send RID update notification to peer gateway, carry the AID of this terminal and new RID;

Step 723, target P-GW responds bearing modification result to target S-GW, and target S-GW responds bearing modification result to target MME;

Step 724, performs former BlueDrama and deletes and forwarding tunnel release flow process.This flow process can be triggered by timer by former P-GW or former MME.

In above-mentioned flow chart 7, target S-GW finds it is switching across P-GW in step 704, then need the downlink data message of the follow-up arrival of buffer memory, until after the data channel between step 721 target S-GW and Target Wireless side network element sets up, just mail to terminal.

Above-mentioned flow process safeguarded by P-GW and preserve terminal to client information, can adopt processing to client information with to data message of aforesaid way two maintenance terminal in handoff procedure, compared with the flow process of Fig. 5, just the path of transmitting client information of terminal is different.

The functional module of P-GW with MME that the functional module that P-GW with MME corresponding to above-mentioned flow process is correlated with switching is corresponding with Fig. 5 flow process is substantially identical, difference is mainly the relevant function that between P-GW, tunnel is set up, and in above-mentioned flow process, these two functions are controlled to set up by MME.Particularly:

MME also comprises tunnel and sets up module, for after determining the target P-GW being different from former P-GW, setting up to target P-GW request the forwarding tunnel cutting terminal between former P-GW and target P-GW by target S-GW, is that the forwarding tunnel mark that this forwarding tunnel distributes is delivered to former MME by this target P-GW; And receiving target P-GW is after the forwarding tunnel mark cutting out terminal distribution, sends forwarding tunnel and sets up request, carry this forwarding tunnel mark by former S-GW to former P-GW;

The second tunnel in P-GW sets up that the function of module is corresponding to be changed into: for receive that target MME sends for after incision terminal sets up the request of forwarding tunnel between former P-GW and target P-GW, for the forwarding tunnel of this this forwarding tunnel of incision terminal distribution identifies; And receiving after former MME to be set up by forwarding tunnel and ask the target P-GW that carries to be the forwarding tunnel mark cutting out terminal distribution, set up and forwarding tunnel between this target P-GW, and reply forwarding tunnel by former S-GW to this former MME and set up response.

In addition, when the incision control module of MMN transmits the AID of incision terminal, the address information of former P-GW target P-GW can not be sent to together.The packet forwarding module of P-GW and the function of opposite end maintenance of information module refer to above to the description of the function of mode two times these two modules.

Fig. 8 shows on the basis of the network architecture shown in Fig. 3 or Fig. 4, and terminal carries out the flow process across P-GW handoff procedure.Do not have signaling interface between P-GW, set up the data forwarding channel between former P-GW and target P-GW by MME, data buffer storage is at S-GW.Concrete steps are described below:

Step 801-805, with step 701-705, also namely with step 501-505;

Step 806, target P-GW replys session establishment response message to target S-GW, and target S-GW replys session establishment response message to target MME, all carries the RID that this terminal is new;

Step 807, target MME initiates RID registration, and the RID of this terminal of being preserved by this terminal attaching ILR is updated to new RID;

Step 808-813, with step 708-713;

Step 814, former P-GW replys former S-GW forwarding tunnel and sets up response, and former S-GW replys former MME forwarding tunnel and sets up response;

In this flow process, due to be MME preserve terminal to client information, in forwarding tunnel response not carried terminal to client information, but the AID-RID map information of all Correspondent Nodes of this terminal can be carried.

Now, data flow is described below:

The downlink data message that the Correspondent Node that former P-GW receives issues terminal flows to: former P-GW-> target P-GW-> target S-GW, data will be buffered in target S-GW.

The downlink data message flow direction that the Correspondent Node that target P-GW receives issues terminal is: target P-GW-> target S-GW, data will be buffered in target S-GW.

The flow direction of uplink data messages is: the former P-GW of terminal-> former wireless side network element-> former S-GW->.

Step 815, former MME sends switching command to former wireless side network element;

Step 816, former wireless side network element sends switching command to terminal;

Step 817, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 818, Target Wireless side network element notification target MME switches;

Step 819, target MME sends reorientation forward completion notice message to former MME;

Step 820, former MME replys reorientation forward to target MME and completes acknowledge message, carry this terminal to client information, also can carry the AID-RID map information of all Correspondent Nodes of this terminal;

Step 821, target MME finds the address information of opposite end MME according to this terminal to the AID of Correspondent Node in client information, sends RID update notification, carry this terminal AID and new RID to opposite end MME;

Step 822, target MME sends amendment bearing request message to target S-GW, and target S-GW sends amendment bearing request message to target P-GW;

Above-mentioned two amendment bearing request message can carry the AID-RID map information of all Correspondent Nodes of this terminal.After data channel between this step target S-GW and Target Wireless side network element is set up, downlink data is just mail to terminal by target S-GW.

Send if can't help P-GW the AID-RID map information that RID update notification does not transmit this terminal communication opposite end yet, target S-GW does not need to send amendment bearing request message to target P-GW.

Step 823, target P-GW responds bearing modification result to target S-GW, and target S-GW responds bearing modification result to target MME;

Step 824, performs former BlueDrama and deletes and forwarding tunnel release flow process.This flow process can be triggered by timer by former P-GW or former MME.

In above-mentioned flow process, by the common maintenance terminal of P-GW and MME to client information, P-GW checks data message, carries out flowing and detects in real time, will need the opposite end message notice MME upgraded, preserved by MME and maintenance terminal to client information.In this case, after forwarding tunnel between former P-GW and target P-GW is set up, to maintenance and the transmission of client information, the process of data message can in the following ways:

Mode three, by former side and target side P-GW, MME maintenance terminal to client information.

After forwarding tunnel is set up, former P-GW is forwarded directly to target P-GW after receiving downlink data message, former MME continue to safeguard this terminal of preserving to client information; Target P-GW carries out solution RID encapsulation to the downlink data message received and forwards after checking again, the opposite end message notice target MME of this terminal upgraded will be needed, target MME will preserve in this locality, safeguard this terminal to client information.Afterwards, this terminal of preserving is sent to target MME (as be carried in reorientation forward complete in acknowledge message) to client information by former MME, target MME by receive with this locality preserve this terminal to client information merge, client information is safeguarded after being combined afterwards;

During employing mode three, the flow direction of uplink data messages and to the encapsulation process of data message with mode two.Only descending forwarding tunnel need be set up between target P-GW and former P-GW.

The difference of the functional module of P-GW and MME that the functional module that P-GW with MME corresponding to above-mentioned flow process is relevant to switching is corresponding with Fig. 7 flow process is that RID registers, RID upgrades, to the maintenance of client information and transmission, and to functions such as the process of data message, be specifically related to lower module:

P-GW does not have RID Registering modules, RID update module and opposite end maintenance of information module;

This new RID after for the new RID of incision terminal distribution, is also sent to target MME through target S-GW by the incision control module in P-GW; And after the forwarding tunnel between this P-GW and former P-GW sets up, the RID of solutioning encapsulation is carried out to the data message issuing incision terminal and checks, send opposite end information updating notice to target MME, carry this incision terminal needing renewal to client information.

P-GW cuts out before control module also sets up for the forwarding tunnel between this P-GW and target P-GW, the data message solution RID cutting out terminal that issues received is encapsulated and checked, send out opposite end information updating notice to former MME, carry this that need to upgrade cut out terminal to client information; After this forwarding tunnel is set up, be directly transmitted to target P-GW by issuing this data message cutting out terminal.

MME comprises RID Registering modules, opposite end maintenance of information module and RID update module;

The incision control module of MME, after receiving this new RID, activates the RID Registering modules of this MME.

The RID Registering modules of MME, for after the new RID receiving incision terminal, sends registration request to incision terminal attaching ILR, carries the AID of this incision terminal and new RID.

Opposite end maintenance of information module in MME safeguards that to client information and according to the update notification of P-GW this is to client information, comprising the correspondence relationship information of terminal AID and Correspondent Node AID for what preserve terminal.

In MME cut out control module also for completed by reorientation forward acknowledge message by preserve cut out terminal target MME is sent to client information.

Incision control module in MME also at the new RID receiving the incision terminal that target P-GW sends, and former MME is transmitted with this incision terminal of local maintenance client information is merged after, activate the RID update module in this MME.

RID update module in MME is used for the AID to Correspondent Node in client information according to incision terminal, inquire the address information of the MME of Correspondent Node access, the MME accessed to the Correspondent Node of this terminal sends RID update notification, carries AID and this new RID of this terminal.

Above-mentioned flow process also can have a variants, safeguarded by P-GW and preserve terminal to client information, and be sent to opposite end RID upgrade.Now, relative to the change of above-mentioned flow process be:

Two forwarding tunnels in step 814 set up response message answer carried terminal to client information, former MME receive rear buffer memory this to client information;

Step 821 is cancelled;

In step 822, the amendment bearing request message that target MME sends to target S-GW, and target S-GW to the amendment bearing request message that P-GW sends all carry this terminal to client information;

Increase a step 822a, target P-GW after step 822 according to the AID to Correspondent Node in client information of this terminal, search or find to ILR the RID of opposite end in this locality after, send RID update notification to peer gateway, carry the AID of this terminal and new RID;

This variants can adopt mode two to safeguard client information and deal with data message.The flow process of this variants, compared with Fig. 7 flow process, just changes RID registration to have been come by target MME.

Fig. 9 shows on the basis of the network architecture shown in Fig. 2, and terminal carries out the flow process across P-GW handoff procedure.In this flow process, do not have signaling interface between P-GW, need set up data forwarding channel between P-GW by MME, data buffer storage is at wireless side network element.

The step of the flow process that the step of this flow process is corresponding with Fig. 7 is substantially identical, and step 901-924 corresponds respectively to step 701-724, and difference is:

Step 909, on the basis of step 709, needs to carry the tunnel information that Target Wireless side network element is the tunnel distributing being established to target MME in the switching request acknowledgement message that Target Wireless side network element is responded to target MME;

Step 910 is on the basis of step 710, set up in request message at target MME to the forwarding tunnel that target S-GW sends, the described tunnel information that Target Wireless side network element distributes need be carried, after target S-GW receives, the downlink tunnel between foundation and Target Wireless side network element;

Like this, after step 914 sets up the forwarding tunnel between former P-GW and target P-GW, what former P-GW received issues the downlink data message of terminal after target P-GW, target S-GW forward, and will be buffered in the network element of Target Wireless side.

Correspondingly, the function of P-GW with MME corresponding with Fig. 7 flow process is compared, and the difference of the function of this flow process P-GW and MME is as follows:

The incision control module of MME is before controlling to set up the forwarding tunnel between target P-GW and former P-GW, and mutual by with Target Wireless side network element and target S-GW, for incision terminal sets up the carrying between this Target Wireless side network element and this target S-GW;

After the forwarding tunnel of packet forwarding module between this P-GW and target P-GW of P-GW is set up, the data message forwarding that issuing of receiving is cut out terminal is to target P-GW; And, after receiving the data message issuing incision terminal, be transmitted to target S-GW;

S-GW receive target P-GW forward issue incision terminal data message after be transmitted to Target Wireless side network element;

Target Wireless side network element is advanced row cache after receiving the data message issuing incision terminal, after this incision terminal switch to this Target Wireless side network element, the data message of buffer memory is sent to this terminal.

Similarly, based on the network architecture shown in Fig. 3, on the basis of Fig. 8 flow process, can by transmitting to target MME the tunnel information that Target Wireless side network element is tunnel distributing between foundation and target S-GW in step 810, to set up in request message to the forwarding tunnel that target S-GW sends in step 811 target MME and carry this tunnel information, in advance between target S-GW and Target Wireless side network element for this terminal sets up downlink tunnel.Thus the downlink data message issuing terminal making former P-GW receive is after target P-GW, target S-GW forward, and is buffered in the network element of Target Wireless side.

The mode first setting up downlink tunnel between target S-GW and Target Wireless side network element also can be used for the network architecture of Fig. 2, target MME can after the tunnel information receiving the network element distribution of Target Wireless side, special notification is target S-GW once, thus sets up the downlink tunnel of this terminal between target S-GW and Target Wireless side network element in advance.

In order to simplified characterization, the flow process of above Fig. 6 to Fig. 9 illustrates for the situation across P-GW.If P-GW does not change in fast mobile terminal process, the data forwarding channel between P-GW is no longer set up when then switching, P-GW is without the need to being the new RID of terminal distribution, without the need to being sent to the RID register flow path of ILR and the RID more new technological process to opposite end, in addition, other process is similar to the aforementioned embodiment, in this no longer repeated description.

When P-GW does not change, also can adopt between S-GW and set up forwarding interface to realize the downlink message forwarding of handoff procedure, data buffer storage is at S-GW.Its flow process as shown in Figure 10, can based on the network architecture of Fig. 2, Fig. 3 or Fig. 4.Concrete steps are described below:

Step 1001, wireless side network element judges that needing to send S1 switches;

Step 1002, former wireless side network element sends handover request to former MME;

Step 1003, the reorientation forwarding request message that former MME is sending to target MME;

Step 1004, target MME sends session establishment request to target S-GW, and band P-GW relevant information, comprises the Tunnel Identifier of P-GW address and this P-GW; Target S-GW sends carrying to P-GW and sets up request, and carry the Tunnel Identifier into the tunnel distributing set up and between target P-GW, P-GW preserves the tunnel information of former S-GW and target S-GW simultaneously;

Step 1005, P-GW replys target S-GW carrying and sets up response; Target S-GW replys session establishment response message to target MME;

Step 1006, target MME request target wireless side network element performs switching;

Step 1007, Target Wireless side network element responds switching request acknowledgement message to target MME, does not carry forwarding tunnel information;

Step 1008, target MME sends forwarding tunnel to target S-GW and sets up request, asks the data forwarding tunnel set up between S-GW;

Step 1009, target S-GW replys target MME forwarding tunnel and sets up response, carries the forwarding tunnel mark that the data forwarding tunnel for setting up between S-GW is distributed;

Step 1010, target MME sends reorientation forward response message to former MME;

Step 1011, former MME sends forwarding tunnel to former S-GW and sets up request, request set up S-GW and between data forwarding tunnel, carry this forwarding tunnel mark that target S-GW distributes;

Step 1012, former S-GW replys former MME forwarding tunnel and sets up response;

Step 1013, former MME sends switching command to former wireless side network element;

Step 1014, former wireless side network element sends switching command to terminal;

Now, the data of former network mail to objective network by from the forwarding tunnel between S-GW;

Step 1015, terminal sends switch acknowledgment message to Target Wireless side network element;

Step 1016, Target Wireless side network element notification target MME switches;

Step 1017, target MME sends reorientation forward completion notice message to former MME;

Step 1018, former MME replys reorientation forward to target MME and completes acknowledge message;

Step 1019, target MME request target S-GW revises beared information, carries the tunnel information that Target Wireless side network element distributes;

Step 1020, target S-GW responds bearing modification result to target MME;

Step 1021, performs former BlueDrama and deletes and forwarding tunnel release flow process.This flow process can be triggered by timer by former MME.

If adopt MME preserve terminal to client information time, the transmission of client information and the decline that is maintained in Fig. 5 a flow process are illustrated, no longer repeat here.

In order to simplified characterization, the situation that above all embodiments all change for MME illustrates that terminal carries out the processing procedure switched without fixed anchor point.When fast mobile terminal, MME also may not change, and now except the Signalling exchange no longer needed between MME, other process is consistent with above-described embodiment, can not impact elaboration the present invention, therefore in this no longer repeated description.

In order to simplified characterization, all there is the system of MME to illustrate that terminal carries out the processing procedure switched without fixed anchor point in above all embodiments.In the EPS network that there is S4SGSN, the function of MME can have been come by SGSN, and other process are consistent with above-described embodiment, can not impact elaboration the present invention, therefore in this no longer repeated description.

P-GW can be combined into an access network element with S-GW, now, does not need the interface existed between S-GW and P-GW in above-described embodiment, and the network element between all and S-GW and P-GW will carry out interface with this access network element.The Network Element Function of system, interface (except S5 mouth), flow process are consistent with above-described embodiment, are not described in detail in this.

The mode that network element searches terminal attaching HSS, ILR, PTF can be realize by inquiring about local configuration.

Above-mentioned flow process is not limited to EPS network, has the network architecture that similar chain of command is separated with medium surface, also can be suitable for for other.The network architecture that described similar chain of command is separated with medium surface comprises the IAD be connected between wireless side network element and packet data network, and the mobile management node (Mobility Management Node:MMN) to be connected with wireless side network element with IAD, be connected between network element and refer to, between network element, there is signaling and/or data-interface.Mobile management node and IAD can have different titles in the different network architectures, can corresponding to the part in an existing network element or multiple network element or a network element.Mobility management node is responsible for the related work of the chains of command such as the mobile management of terminal, the process of Non-Access Stratum signaling and the contextual management of user's mobile management; IAD is the gateway device connecting wireless access network and packet data network, provides access service for being responsible for terminal, and between wireless access network and packet data network the function such as forwarding data.

In the above-mentioned network architecture, the function of IAD is realized by the gateway in grouping system (EPS) network architecture of evolution and grouped data network gateway, mobile management node is by MME and/or SGSN in the EPS network architecture, and wireless access network is the universal mobile telecommunications system land radio access web (E-UTRAN) of evolution.But in other embodiments, this correspondence also can be different.The function of such as IAD also can by Ultra-Mobile Broadband (UMB, Ultra Mobile Broadband) IAD (AGW of system, Access GateWay) realize, mobile management node can be that Serving GPRS Support Node (SGSN) in 3G system is as S4SGSN or Ultra-Mobile Broadband (UMB, Ultra MobileBroadband) the session citation network controller (SRNC of system, Session Reference NetworkController), wireless access network also can be universal mobile telecommunications system land radio access web (UTRAN) or Ultra-Mobile Broadband wireless access system etc.

Correspondingly, communication network provided by the invention comprises wireless side network element, IAD, and and there is between wireless side network element and IAD the mobile management node (MMN) of signaling interface, IAD and between wireless side network element and packet data network, there is data-interface, also comprise the identity position register (ILR) with IAD and/or MMN with signaling interface, wherein:

MMN be used for for incision terminal determine different from a former IAD target access gateway time, the identify label (AID) of this incision terminal is sent to this target access gateway;

IAD is used for after the AID receiving the incision terminal that target MMN transmits, the station location marker (RID) new for this terminal distribution also preserves the map information of this terminal AID and this new RID, and carries out RID encapsulation to the data message of this incision terminal, separate RID encapsulation and forward;

IAD or MMN also for sending registration request to incision terminal attaching ILR, carry the new RID of this incision terminal;

The RID of this incision terminal of preserving, for safeguarding the AID-RID map information of home subscriber terminal, after receiving the registration request to incision terminal, is updated to this new RID by ILR.

Further, when RID renewal is completed by MMN:

IAD is also for after for the new RID of incision terminal distribution, and the RID that this is new is sent to target MMN;

MMN is also for after the new RID receiving incision terminal, and the gateway that the Correspondent Node to this terminal accesses sends RID update notification, carries AID and this new RID of this terminal.

Further, when RID renewal is completed by IAD:

IAD also for maintenance terminal to client information, comprise the correspondence relationship information of this terminal AID and Correspondent Node AID; In handoff procedure, by safeguard cut out terminal this target access gateway is sent to client information; And for the new RID of incision terminal distribution and receive this incision terminal that former IAD sends to after client information, the gateway transmission RID update notification that the Correspondent Node to this incision terminal access, carries AID and this new RID of this terminal.

Further, MMN and IAD can coordinate the function that forwarding tunnel is set up and downlink message sends, as follows:

MMN also for after determining to be different from the target access gateway of former IAD, with target access gateway and former IAD mutual, set up the forwarding tunnel cutting terminal between this target access gateway and former IAD; Or, IAD also for by the signaling interface between IAD, for incision terminal sets up the forwarding tunnel between this IAD and former IAD;

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a method for terminal switch, be applied to the communication network comprising wireless side network element, be connected to IAD, mobile management node and identity position register (ILR) between wireless side network element and packet data network, the method comprises:

2. the method for claim 1, is characterized in that:

3. method as claimed in claim 1 or 2, is characterized in that:

4. method as claimed in claim 2, is characterized in that:

5. the method for claim 1, is characterized in that:

6. method as claimed in claim 5, is characterized in that:

7. method as claimed in claim 6, is characterized in that:

8. method as claimed in claim 6, is characterized in that:

9. method as claimed in claim 6, is characterized in that:

10. method as claimed in claim 6, it is characterized in that, between this target P-GW and former P-GW, the data forwarding channel of this terminal is set up by following process:

This former MMN sends forwarding tunnel by former S-GW to this former P-GW and sets up request, carries this forwarding tunnel mark; After this former P-GW receives, the forwarding tunnel of this terminal between foundation and this target P-GW, replys forwarding tunnel by this former S-GW to this former MMN and sets up response.

11. methods as claimed in claim 10, is characterized in that:

12. methods as claimed in claim 6, is characterized in that:

13. methods as claimed in claim 9, is characterized in that:

14. methods as claimed in claim 10, is characterized in that:

15. methods as claimed in claim 6, is characterized in that:

16. methods as described in claim 12,13 or 15, is characterized in that:

17. methods as described in claim 12,13 or 14, is characterized in that:

18. methods as described in claim 13 or 14, is characterized in that:

19. methods as claimed in claim 13, is characterized in that:

20. methods as described in claim 9 or 10, is characterized in that:

21. methods as described in claim 6 or 10, is characterized in that:

22. methods as claimed in claim 15, is characterized in that:

In handoff procedure, between this target P-GW and former P-GW, only set up descending forwarding tunnel; Before this terminal switch to Target Wireless side network element, the flow direction of the data message that this terminal sends is: the former P-GW of this terminal-> former S-GW-> of former wireless side network element->, former P-GW carries out RID encapsulation and inspection to this data message, and that safeguards this terminal maybe will need the former MMN of opposite end message notice of this terminal upgraded to client information.

23. methods as claimed in claim 18, is characterized in that:

24. methods as claimed in claim 19, is characterized in that:

In handoff procedure, this former P-GW by with the forwarding tunnel of this target P-GW by before the transmitting to this target P-GW client information of this terminal of preserving, the flow direction of the data message that this terminal sends is: the former P-GW of this terminal-> former S-GW-> of former wireless side network element->, former P-GW carries out RID encapsulation and inspection to this data message, safeguard this terminal to client information;

This former P-GW transmits described to after client information and before this terminal switch to Target Wireless side network element, the flow direction of the data message that this terminal sends is the former P-GW-> target P of this terminal-> former S-GW-> of former wireless side network element->-GW, target P-GW carries out RID encapsulation and inspection to this data message, safeguard this terminal to client information.

25. methods as claimed in claim 5, is characterized in that:

26. methods as claimed in claim 6, is characterized in that, in this handoff procedure to the connection establishment of former side between terminal to packet data network and target side, discharge relevant process and comprise:

27. methods as claimed in claim 5, is characterized in that:

The communication network that 28. 1 kinds of chains of command are separated with medium surface, comprise wireless side network element, IAD, and and there is between wireless side network element and IAD the mobile management node (MMN) of signaling interface, described IAD and between wireless side network element and external packet data networks, there is data-interface, for forwarding the data between wireless side network element and packet data network, it is characterized in that, also comprise the identity position register (ILR) with described IAD and/or MMN with signaling interface, wherein:

29. communication networks as claimed in claim 28, is characterized in that:

30. communication networks as claimed in claim 28, is characterized in that:

31. communication networks as claimed in claim 28, is characterized in that:

32. communication networks as claimed in claim 28, is characterized in that:

33. communication networks as claimed in claim 32, is characterized in that:

Described MMN comprises:

Described P-GW comprises:

34. communication networks as claimed in claim 33, is characterized in that:

35. communication networks as claimed in claim 33, is characterized in that:

36. communication networks as claimed in claim 33, is characterized in that:

37. communication networks as claimed in claim 35, is characterized in that:

38. communication networks as described in claim 33 or 36, is characterized in that:

39. communication networks as claimed in claim 38, is characterized in that:

40. communication networks as claimed in claim 37, is characterized in that:

41. communication networks as claimed in claim 37, is characterized in that:

42. communication networks as described in claim 35 or 36, is characterized in that:

43. communication networks as claimed in claim 36, is characterized in that:

44. communication networks as described in claim 39 or 40 or 41, is characterized in that:

45. communication networks as claimed in claim 28, is characterized in that:

46. communication networks as claimed in claim 35, is characterized in that: