CN101730174B

CN101730174B - Method and system for realizing cross-system switching in evolved packet system

Info

Publication number: CN101730174B
Application number: CN200910083534A
Authority: CN
Inventors: 蒋陶; 周晓云; 宗在峰
Original assignee: ZTE Corp
Current assignee: Nantong Well Electric Moto Co., Ltd.
Priority date: 2009-05-08
Filing date: 2009-05-08
Publication date: 2012-10-10
Anticipated expiration: 2029-05-08
Also published as: CN101730174A

Abstract

The invention provides a method and a system for realizing cross-system switching in an evolved packet system (EPS). In a cross-system request in a single-APN and multi-PDN connection, a PCRF selects a QoS rule connected with a PDN from a plurality of PDN connections under the APN as a decision basis of QoS connected with the PDN in a new access network to make the QoS rule and return the QoS rule to MAG; the PCRF indexes a corresponding IP-CAN session according to a switching IP address or a prefix in the QoS rule, returns a PCC rule to P-GW after acquires the PCC rule of the IP-CAN session in the new access network, and associates the IP-CAN session with a gateway control session at the same time. The system correctly associates IP-CAN session modification instruction information and gateway control session setup instruction information into the same IP-CAN session, achieves strategy and billing control of different IP-CAN sessions under the same APN and ensures realization of user services.

Description

Realize the method and system that interdepartmental system switches in the grouping system of evolution

Technical field

The present invention relates to mobile communication technology, refer to especially in a kind of grouping system of evolution, support UE to insert under the scene of same PDN many times and realize the method and system that interdepartmental system switches.

Background technology

Fig. 1 is existing third generation partner program (3GPP; 3rd Generation Partnership Project) grouping system (EPS of evolution; Evolved Packet System) composition configuration diagram, as shown in Figure 1,3GPP EPS is by the UMTS land radio access web (E-UTRAN of evolution; Evolved Universal Terrestrial Radio Access Network), mobile management unit (MME; Mobility Management Entity), gateway (S-GW, Serving Gateway), grouped data network gateway (P-GW, Packet Data Network Gateway; Claim PDN GW again), home subscriber server (HSS; Home Subscriber Server), authentication and authorization charging (AAA, Authentication, the Authorization and Accounting) server of 3GPP, "Policy and Charging Rules Function (PCRF, Policy and Charging Rules Function) entity and other support nodes are formed.

Wherein, MME is used for the processing and the work relevant with chain of command such as the contextual management of user's mobile management of mobile management, Non-Access Stratum signaling.S-GW is the accessing gateway equipment that links to each other with E-UTRAN; Be used between E-UTRAN and P-GW, transmitting data; And be responsible for pending datas such as paging are carried out buffer memory, S-GW is also referred to as Mobile Access Gateway (MAG, Mobile Access Gateway) in other grouping system.P-GW is the borde gateway of EPS and packet data network (PDN, Packet Data Network), is used to realize that the access of PDN reaches functions such as between EPS and PDN, transmitting data.PCRF is the "Policy and Charging Rules Function entity, and PCRF links to each other through receiving interface Rx interface and carrier network agreement (IP, Internet Protocol) business network; Obtain business information; PCRF also links to each other with gateway device in the network through the Gx/Gxa/Gxc interface, is used to initiate the foundation that IP carries, the service quality (QoS of assurance business datum; And the control of chargeing Quality of Service).

As shown in Figure 1, EPS supports the intercommunication with non-3 GPP system, and the intercommunication of EPS and non-3 GPP system realizes that through the S2a/S2b/S2c interface P-GW is as the anchor point between 3GPP and non-3 GPP system.Wherein, non-3 GPP system is divided into trusted non-3GPP IP Access Network and trustless non-3GPP IP Access Network.The non-3GPP IP of trusted Access Network can directly be connected with P-GW through the S2a interface; Trustless non-3GPP IP Access Network links to each other with P-GW through the packet data gateway (ePDG, Evolved Packet Data Gateway) of evolution, and the interface between ePDG and P-GW is S2b.S2c provides UE and user plane relevant control and mobility support between the P-GW, and the mobility management protocol of its support is for supporting the mobile IP v 6 (DSMIPv6, Mobile IPv6support for dual stack Hosts and Routers) of two stacks.

In the 3GPP network between EPS; Strategy and charge execution function (PCEF; Policy and charging enforcement function) is present among the P-GW; PCRF needs only the control that can accomplish all functions with the P-GW interface, and is as shown in Figure 1, passes through Gx interface exchange message between PCRF and P-GW.When the interface between P-GW and S-GW during based on PMIPv6; S-GW also exists bearing binding and event reporting function (BBERF; Bearer Binding and Event Report Function) business data flow is carried out QoS control; As shown in Figure 1, pass through Gxc interface exchange message between S-GW and the PCRF.When inserting through the trusted non-3 GPP access network, the trusted non-3 GPP access network Central Shanxi Plain is also resident to have BBERF.

As shown in Figure 1, pass through Gxa interface exchange message between trusted non-3 GPP access network pass and the PCRF.When UE roamed, S9 interface (not shown) was as the interface of ownership place PCRF with visit ground PCRF.For providing professional application function (AF, Application Function), UE sends the business information that is used to generate strategy and charges (PCC, Policy and charging control) rule to PCRF simultaneously through Rx interface.

The EPS system supports many PDN (Multiple PDN) to insert, and promptly subscriber equipment (UE, User Equipment) can be linked into a plurality of PDN simultaneously through a plurality of P-GW or a P-GW; And EPS supports that UE can insert same PDN many times simultaneously.

In 3GPP, can find corresponding PDN through Access Point Name (APN, Access Point Name), can think that UE can keep a plurality of PDN of same APN are connected simultaneously.Usually claim that UE is connected to an IP connection access network (IP-CAN, IP Connectivity Access Network) session to of PDN, that is to say that EPS supports UE the while with a PDN a plurality of IP-CAN sessions to be arranged.UE can perhaps set up a plurality of IP with a PDN respectively and be connected in non-3GPP network in the 3GPP access network, but can not in different access networks, keep IP to connect simultaneously.Therefore, when the interdepartmental system that between 3GPP network and non-3GPP network, switches as UE switches, must the IP in the access network of source be connected and all switch in the target access network network.

According to present agreement, in interdepartmental system handoff procedure, UE sends the sign that carries switching in the PDN connection request (request PDN connection) for the target access network network; After gateway equipment in the target access network network (for the 3GPP system) or access device (for non-3 GPP system) obtain the PDN connection identifier that distributes for this PDN connection in the new connecting system; The PDN connection identifier that in agent binding update (PBU, Proxy Binding Update) message, will distribute sends to P-GW.Because the PDN connection identifier of source connecting system and target access system is not same; Therefore; Which PDN P-GW can't determine in the needs handover source connecting system according to the PDN connection identifier of goal systems to connect; In this case, P-GW can only carry out the switching that PDN connects according to an order at random.Because interdepartmental system switches the switching that requirement must be carried out whole PDN connections, therefore, the order of switching the PDN connection is unimportant, and still, the method for the interdepartmental system switching of the realization of agreement regulation at present cause following problem can for the policy control of EPS:

Switch to the flow process of 3GPP system from non-3 GPP system; The S-GW of 3GPP is before sending PBU message to P-GW; BBERF functional unit among the S-GW can obtain the Qos rule that this IP is connected alternately with PCRF; But, this moment 3GPP S-GW also not have P-GW be the UE IP address allocated, BBERF brings in the message of PCRF and has only network access Identifier (NAI in the agreement at present; Network Access Identifier) and APN; PCRF according to these information can't be from non-3GPP connecting system this UE with select one during a plurality of PDN that APN sets up down are connected before the QoS rule downloading that generates in the new access network of the IP CAN session of setting up give BBERF, that is to say that PCRF can't carry out related with the IP-CAN conversation message gateway control session message that belongs to same PDN connection; And, must distinguish different IP-CAN session of UE for PCRF, could carry out different strategies charging control to different IP-CAN sessions., 3GPP also exists above-mentioned problem from switching to the flow process of non-3GPP.

Method from the interdepartmental system switching of the realization of present agreement regulation; Because PCRF can't carry out related with the IP-CAN session gateway control session that belongs to same PDN connection; Can not realize the strategy and the control of chargeing, influence user's business realizing to different IP-CAN session.

Summary of the invention

In view of this; Main purpose of the present invention is to provide in a kind of grouping system of evolution and realizes the method that interdepartmental system switches; Supporting UE to insert under the scene of same PDN many times, can realize the strategy and the control of chargeing to different IP-CAN session, guarantee user's business realizing.

Another object of the present invention is to provide in a kind of grouping system of evolution and realize the system that interdepartmental system switches; Supporting UE to insert under the scene of same PDN many times; Can realize the strategy and the control of chargeing, guarantee user's business realizing to different IP-CAN session.

For achieving the above object, technical scheme of the present invention is achieved in that

Realize the method that interdepartmental system switches in a kind of grouping system of evolution, this method may further comprise the steps:

In the interdepartmental system request during single Access Point Name APN multi-grouping data network PDN connects; "Policy and Charging Rules Function PCRF chooses the service quality QoS parameter that PDN under the current APN connects, based on the QoS rule in the new connecting system of this qos parameter decision-making and be handed down to Mobile Access Gateway MAG;

Said MAG obtains to switch based on the QoS rule and connects IP address or prefix, and sends agent binding update messages to P-GW, carries in the said agent binding update messages to switch to connect IP address or prefix;

P-GW initiates the indication of IP connection access network IP-CAN session modification to PCRF;

PCRF connects IP address or prefix based on the switching of carrying in the indication of said session modification, sets up the related of gateway control session and IP-CAN session, and with the PCC rule downloading of this IP-CAN session in new Access Network to P-GW.

Said MAG is gateway S-GW, also comprises before this method:

When triggering new PDN connection in the network of UE in current access, UE initiates to carry the PDN connection request of the corresponding APN of new PDN to mobile management unit MME;

MME sends default bearing to S-GW and sets up request, and said default bearing is set up and carried new PDN corresponding APN and default bearing ID in the request;

S-GW sends gateway control session to PCRF and sets up request.

Said MAG is S-GW, also comprises before this method:

When UE detect between occurring network switch after, initiate to carry the handoff request of APN and switching mark to MME;

MME sends the request of carrying of setting up to S-GW, and said foundation is carried in the request and carried APN and the default bearing ID that receives;

S-GW sets up request to the gateway control session that PCRF sends, and resident among the said S-GW have bearing binding and an event reporting function BBERF.

Also comprise after this method:

Said P-GW returns the agent binding response according to after the PCC Policy Updates content that receives to MAG, and MAG returns to set up to MME and carries response; Among the said P-GW resident have the strategy and charge execution function PCEF.

Judge that current request is that the foundation of the interdepartmental system request during the many PDN of single APN connect comprises: the address of wireless access type RAT or RAT and Mobile Access Gateway MAG and default bearing ID parameter.

The said gateway control session of setting up specifically comprises with the related of IP-CAN session:

Said PCRF connects the IP allocation index to corresponding IP-CAN session according to the switching that receives, and obtains the corresponding IP-CAN session of gateway control session, between this IP-CAN session and gateway control session, sets up related.

Said SGW sets up address information and the default bearing ID that carries APN, network access Identifier NAI, RAT, MAG in the request to the gateway control session that PCRF sends.

Realize the system that interdepartmental system switches in a kind of grouping system of evolution, this system comprises the authentication and authorization charging server AAA of UE, MME, MAG, P-GW, PCRF and home subscriber server HSS/3GPP, wherein,

UE is used for triggering new PDN at current access network and connects, to MME initiate the PDN connection request or detecting switch between occurring network after, initiate handoff request to MME;

MME is used for behind the PDN connection request or handoff request that receive from UE, initiates the authentication to UE to HSS/AAA, and after authentication passes through, sends the request of carrying of setting up to MAG;

MAG is used for after the foundation carrying request that receives from MME, sending gateway control session to PCRF and setting up request; Receive the QoS rule that PCRF returns, obtain according to the QoS rule and switch connection IP address or prefix, and send agent binding update messages to P-GW; Carry in the said agent binding update messages to switch and connect IP address or prefix;

P-GW receives the agent binding update messages from MAG, initiates the indication of IP-CAN session modification to PCRF, receives the PCC rule that PCRF returns;

PCRF is used in the interdepartmental system request that single Access Point Name APN multi-grouping data network PDN connects, and chooses the qos parameter that a PDN under the APN connects, and obtains the QoS rule and is handed down to MAG according to this qos parameter; Reception is from the indication of the IP-CAN session modification of P-GW, sets up the related of gateway control session and IP-CAN session, and with the PCC rule downloading of this IP-CAN session in new Access Network to P-GW.

When triggering new PDN connection in the network of said UE in current access,

Said UE also is used for, and initiates to carry the PDN connection request of the corresponding APN of new PDN to MME;

Said MME also is used for, and, sends default bearing to said MAG and sets up request through behind the authentication at UE, and said default bearing is set up and carried new PDN corresponding APN and default bearing ID in the request;

Said MAG also is used for, and sends gateway control session to PCRF and sets up request;

When detecting between occurring network, said UE switches,

Said UE also is used for, and initiates to carry the handoff request of APN and switching mark to MME;

Said MME also is used for, and, sends foundation to MAG and carries request through behind the authentication at UE, and the default bearing ID that carries APN and MME distribution in the request is carried in said foundation;

Said MAG also is used for, and sends gateway control session to PCRF and sets up request.

Said MAG is S-GW in the 3GPP system, and wherein resident have a BBERF; Resident among the said P-GW have a PCEF.

Can find out from the technical scheme that the invention described above provides; PCRF is according to wireless access type (RAT); The perhaps address of RAT and MAG; It is between the interdepartmental system during the many PDN of single APN connect or the intra-system handover or the scene of newly-built PDN connection that associating default bearing ID parameter is judged current switching; Switch for spanning into system, choose QoS rule that a PDN connects decision basis a plurality of PDN of PCRF from this APN under connect, and set up the QoS rule that acknowledge message will newly make a strategic decision through gateway control session and return to MAG as the QoS of this PDN connection in the new access network; Send the IP-CAN session when setting up Indication message at P-GW to PCRF; PCRF according to IP-CAN session set up the switching IP allocation index that carries in the Indication message to corresponding IP-CAN session; And the PCC strategic decision-making that this IP-CAN session is carried out in the new Access Network obtains to return to P-GW after the new PCC rule, and carries out related with gateway control session the IP-CAN session.Through the inventive method, correctly Indication message and gateway control session are set up in the IP-CAN session and set up Indication message and be associated with same IP-CAN session, realized the strategy and the control of chargeing to different IP-CAN session, guaranteed user's business realizing.

Description of drawings

Fig. 1 is the composition configuration diagram of existing 3GPP EPS;

Fig. 2 realizes the flow chart of the method that interdepartmental system switches for the present invention;

Fig. 3 initiates the schematic flow sheet of first embodiment of PDN connection request for UE among the present invention;

Fig. 4 initiates the schematic flow sheet of second embodiment of handoff request for UE among the present invention.

Embodiment

Fig. 2 realizes the flow chart of the method that interdepartmental system switches for the present invention, and as shown in Figure 2, the inventive method may further comprise the steps:

Step 200: in the interdepartmental system request during the many PDN of single APN connect, PCRF chooses the qos parameter that a PDN current APN under connects, and is regular and be handed down to MAG according to the QoS in the new connecting system of this qos parameter decision-making.

In this step, PCRF sets up request according to gateway control session, and determining current request is the interdepartmental system request during the many PDN of single APN connect.

Before this step; Possibly have two kinds of situation, a kind of situation is that UE triggers new PDN connection again in the network of current access, and UE initiates to carry the PDN connection request of the corresponding APN of new PDN to MME; UE carries out authentication in the 3GPP network; UE is through after the authentication, and MME sends default bearing to S-GW and sets up request, wherein carries new PDN corresponding APN and default bearing ID (bear ID); Another kind of situation is; After UE detects and switches between occurring network; Initiate to carry the handoff request of APN and switching mark (Handover indication) to MME, UE carries out authentication in the 3GPP network, after UE passes through authentication; MME sends to S-GW and creates the request of carrying, wherein carries the APN and the default bearing ID that receive.

In this step; The S-GW of the resident BBERF of having is after receiving the request of setting up carrying; Gateway control session to PCRF sends is set up address information and the default bearing ID that carries APN, NAI and wireless access type (RAT, Radio Access type), MAG in the request at least.After PCRF receives this control session foundation request; According to RAT; Perhaps to judge current switching with default bearing ID parameter be between the interdepartmental system during the many PDN of single APN are connected or intra-system handover to the address parameter of RAT and MAG; Judge the RAT that the RAT that receives stores with self such as PCRF different; Simultaneously according to the state that has existed a plurality of PDN to connect under this APN, confirm that then the request of setting up of this gateway control session is request between a system, under the interdepartmental system handoff scenario of the many PDN of single APN under connecting; For another example; It is identical that PCRF judges the RAT that the RAT that receives stores with self; The address of the MAG that receives is different with the address of the MAG that self stores; Simultaneously among a plurality of default bearing ID of default bearing ID and self storage is identical, confirms that then the request of setting up of this gateway control session is a handoff request under the many PDN connections of intrasystem, the single APN scene.

PCRF can choose the qos parameter that PDN current APN under connects according to the order (perhaps randomly) of storage and carry out the QoS decision-making as the decision basis of qos parameter in the new connecting system, and is regular with the QoS that obtains new decision-making; And the new QoS rule that will obtain is set up acknowledge message through gateway control session and is handed down to MAG.How to carry out the QoS decision-making, belong to those skilled in the art's conventional techniques means, repeat no more here to obtain new QoS rule.What this step was stressed is that PCRF does not utilize the default bearing ID that creates in the request of carrying; But judge to after the interdepartmental system of the many PDN of single APN in being connected switch through RAT (or address of RAT and MAG), choose qos parameter that a PDN current APN under connects decision basis as qos parameter in the new connecting system.

Step 201:MAG obtains to switch according to the QoS rule and connects IP address or prefix, and sends agent binding update messages to P-GW, carries in the said agent binding update messages to switch to connect IP address or prefix; P-GW initiates the indication of IP-CAN session modification to PCRF.

BBERF among the MAG uses this IP address or prefix to be carried in the PBU message and sends to P-GW according to IP address or prefix in the QoS rule that obtains, and this IP address or prefix connect the IP address as switching; After P-GW received PBU message, the PCEF among the P-GW sent the IP-CAN session foundation indication that the switching that carries in the PBU message connects the IP address to PCRF.

Step 202:PCRF sets up the switching of carrying in the indication based on this session and connects IP address or prefix, sets up the related of gateway control session and IP-CAN session, and with the PCC rule downloading of this IP-CAN session in new Access Network to P-GW.

PCRF connects the IP allocation index to corresponding IP-CAN session according to the switching that receives; Thereby which IP-CAN session what know present gateway control session correspondence is; And it is regular to formulate the PCC of this IP-CAN session in new access network, related with setting up between this IP-CAN session and the current gateway control session again.The concrete realization of formulating the PCC rule here belongs to those skilled in the art's conventional techniques means, and its concrete realization is irrelevant with the inventive method, repeats no more here.

PCRF gives the BBERF among the P-GW with the PCC rule downloading that this PDN connects.After the P-GW update content, return agent binding response (Proxy Binding Ack) to MAG, MAG returns to MME and sets up bearing response message.Set up radio bearer alternately through MME, evolution base station and UE.

Corresponding the inventive method also provides a kind of system that realizes that interdepartmental system switches, and this system comprises the authentication and authorization charging server AAA of UE, MME, MAG, P-GW, PCRF and home subscriber server HSS/3GPP at least, wherein,

When triggering new PDN connection in the network of said UE in current access,

Said MAG also is used for, and sets up request to the gateway control session that PCRF sends;

When detecting between occurring network, said UE switches,

Said MAG also is used for, and sets up request to the gateway control session that PCRF sends.

Be example with 3GPP EPS system below, the inventive method be described in detail in conjunction with two embodiment.

First embodiment in the present embodiment, supposes that UE is in the coverage of 3GPP, inserts through E-UTRAN, and adopts the PMIPv6 agreement between S-GW and the P-GW.Suppose that UE has inserted a PDN1 through P-GW, UE triggers new PDN again and connects, and promptly inserts this PDN1 again.Fig. 3 is for the schematic flow sheet of first embodiment of UE initiation PDN connection request among the present invention, and is as shown in Figure 3, may further comprise the steps:

Step 300:UE carries out and initially is attached to E-UTRAN, obtains to be connected with the IP of acquiescence PDN1 through P-GW.

Step 301:UE decision is set up new PDN with PDN1 and is connected, and sends the PDN connection request to MME, carries the corresponding APN of PDN1 in this PDN connection request.

Step 302:UE carries out authentication in the 3GPP system.Concrete realization can be stipulated referring to related protocol, repeats no more here.

Step 303:MME sends the default bearing request of setting up to S-GW, and this is set up and carries PDN1 corresponding APN and default bearing ID in the default bearing request.

Step 304: the S-GW of the resident BBERF of having initiates gateway control session to PCRF and sets up Indication message, and this gateway control session is set up and carried the corresponding APN of PDN1, NAI, RAT, the address of S-GW and default bearing ID in the Indication message.

Step 305: at first; PCRF sets up NAI and the APN that carries in the Indication message according to gateway control session; Learn and under this APN, had an IP-CAN session; Address according to RAT and S-GW does not change simultaneously, and default bearing ID is different with the default bearing ID of the IP-CAN session of self storing simultaneously, judges UE and has set up a PDN connection to PDN1 again.Then, PCRF formulates PCC rule and QoS rule according to user's subscription data, network strategy, carrying attribute etc., simultaneously, also possibly further formulate the events corresponding trigger; At last, PCRF returns gateway control session to S-GW and sets up acknowledge message, and QoS rule, event trigger are sent to S-GW.

Step 306:S-GW installs QoS rule and event trigger, and S-GW sends agent binding update messages to P-GW, carries PDN1 corresponding APN, NAI and default bearing ID in this agent binding update messages.

Step 307: the P-GW of the resident PCEF of having sends the IP-CAN session to PCRF and sets up Indication message, and this IP-CAN session is set up and carried the corresponding APN of PDN1 in the Indication message, and NAI, default bearing ID and P-GW are the UE IP address allocated.PCRF passes through NAI; The corresponding APN of PDN1 and default bearing ID set up Indication message and the gateway control session in the step 304 with the IP-CAN session and set up Indication message and carry out relatedly, set up Indication message and arrive same IP-CAN session at the context relation of PCRF foundation thereby Indication message and gateway control session are set up in the IP-CAN session.

Step 308:PCRF returns the IP-CAN session to P-GW and sets up acknowledge message, and this IP-CAN session is set up and carried corresponding PCC rule and event trigger in the acknowledge message.

PCEF among the step 309:P-GW installs PCC rule and event trigger, and P-GW returns proxy binding acknowledgment messages to S-GW, and carrying P-GW in this proxy binding acknowledgment messages is the UE IP address allocated.

Step 310a: if the IP-CAN session is set up the information of carrying in the Indication message and caused the QoS rule that variation has taken place in the step 304, PCRF will give information through gateway control and QoS rule new QoS rule will be sent to the BBERF among the S-GW.If change has also taken place event trigger, new event trigger is provided.This message can be sent with step 305 simultaneously; Step 301b:S-GW returns gateway control and the QoS rule provides acknowledge message to PCRF.

Step 311:S-GW returns default bearing to MME and sets up response message, and this default bearing is set up and carried P-GW in the response message is the UE IP address allocated.

Mutual between step 312:MME, eNodeB, the UE, set up radio bearer.

Step 313: after radio bearer was set up, MME can send more new bearer request to S-GW, the address information of notice eNodeB etc., S-GW echo reply message.

Visible from first embodiment; PCRF sets up NAI and the APN that carries in the Indication message according to gateway control session; Learn under this APN, to have had an IP-CAN session, the address according to RAT and S-GW does not change simultaneously, and default bearing ID is new default bearing ID; Judge UE and set up a PDN connection again, thereby formulate PCC rule and QoS rule according to user's subscription data, network strategy, carrying attribute to PDN1; And send the IP-CAN session when setting up Indication message to PCRF at P-GW; PCRF sets up the NAI that carries in the Indication message through the IP-CAN session; APN and default bearing ID that PDN1 is corresponding; Indication message is set up in the IP-CAN session to be set up Indication message with the gateway control session in the step 304 and carries out related; Thereby correctly Indication message and gateway control session are set up in the IP-CAN session and set up context relation that Indication message sets up at PCRF, realized controlling with chargeing, guaranteed user's business realizing to the strategy of different IP-CAN session to same IP-CAN session.

Second embodiment; In the present embodiment, switching to the 3GPP access network from the trusted non-3 GPP access network with UE is handoff scenario, and UE has set up a plurality of PDN connections at trusted non-3 GPP access network network to same P-GW; Be respectively PMIPv6 tunnel 1 and PMIPv6 tunnel 2; Fig. 4 is for the schematic flow sheet of second embodiment of UE initiation handoff request among the present invention, and is as shown in Figure 4, may further comprise the steps:

The network decision that step 400:UE has detected 3GPP is initiated to the switching of 3GPP network.

Step 401:UE sends handoff request through eNodeB to MME, carries APN and switching mark (Handover indication) in this handoff request.

Step 402:UE carries out authentication in the 3GPP system.Concrete realization can be stipulated referring to related protocol, repeats no more here.

Step 403:MME selects a S-GW, and initiates to set up the request of carrying to this S-GW, and this foundation is carried in the request and carried APN and default bearing ID.

Step 404: the BBERF that resides on the S-GW sends gateway control session foundation request to PCRF, and this gateway control session is set up in the request and had NAI, APN, RAT, parameters such as the address information of S-GW and default bearing ID.

Step 405:PCRF judges the RAT that receives and the address of S-GW; The RAT that the current UE that stores with self is corresponding is different with the address of S-GW; Thereby confirm that the request of setting up of this gateway control session is the request under the interdepartmental system handoff scenario under the many PDN of single APN connect; Therefore; The decision basis of the QoS that the QoS rule that PDN of picked at random connected a plurality of PDN of PRCF under this APN connected connects as this PDN in the new access network, and set up the QoS rule that acknowledge message will newly make a strategic decision through gateway control session and return to BBERF.

Step 406:S-GW sets up the acknowledge message from gateway control session, obtains corresponding QoS rule and IP address or the prefix in the QoS rule; IP address in the QoS rule or prefix as a field in the agent binding update messages, and are sent to P-GW as switching the IP address.In agent binding update messages, also carry information such as APN, RAT.

Step 407～step 408: reside in the switching IP address that the PCEF on the P-GW will obtain and be carried in the indication of IP-CAN session modification from agent binding update messages, send to PCRF.PCRF switches the IP allocation index to corresponding IP-CAN session according to this, and the new PCC rule of PCC strategic decision-making acquisition in the new Access Network is carried out in this IP-CAN session, and then carries out related with gateway control session the IP-CAN session.

Also carry APN, NAI, default bearing ID etc. in the indication of IP-CAN session modification.

The PCC rule downloading that this PDN that step 409:PCRF will newly make a strategic decision connects is given BBERF.

After step 410:P-GW upgrades the content of BCE; Send proxy binding acknowledgment messages to S-GW; The parameter of carrying in this proxy binding acknowledgment messages comprises: the effective time (lifetime) of this time binding, the IP address information of UE is used for the GRE key of up link etc.

Step 411:S-GW returns the establishment bearing response message to MME, carries the IP address of UE in this establishment bearing response message.Mutual between MME, eNodeB, the UE, set up radio bearer.

After radio bearer was set up, MME can be through sending more new bearer request, the address information of notice eNodeB etc., S-GW echo reply message to S-GW.

Visible from second embodiment; PCRF sets up the RAT that carries in the Indication message according to gateway control session and variation has all taken place in the address of S-GW; Judging the request of setting up of this gateway control session is the request under the interdepartmental system handoff scenario under the many PDN of single APN connect, and UE has carried out the switching between system.The decision basis of the QoS that the QoS rule that PDN of picked at random connected thereby a plurality of PDN of PCRF under this APN connected connects as this PDN in the new access network, and set up the QoS rule that acknowledge message will newly make a strategic decision through gateway control session and return to S-GW; Send the IP-CAN session when setting up Indication message at P-GW to PCRF; PCRF according to IP-CAN session set up the switching IP allocation index that carries in the Indication message to corresponding IP-CAN session; And the PCC strategic decision-making that this IP-CAN session is carried out in the new Access Network obtains to return to P-GW after the new PCC rule; And carry out related with gateway control session the IP-CAN session; Thereby correctly Indication message and gateway control session are set up in the IP-CAN session and set up context relation that Indication message sets up at PCRF, realized controlling with chargeing, guaranteed user's business realizing to the strategy of different IP-CAN session to same IP-CAN session.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. realize the method that interdepartmental system switches in the grouping system of an evolution, it is characterized in that this method may further comprise the steps:

Said MAG obtains to switch based on the QoS rule and connects IP address or prefix, and sends agent binding update messages to grouped data network gateway P-GW, carries in the said agent binding update messages to switch to connect IP address or prefix;

PCRF connects IP address or prefix based on the switching of carrying in the indication of said session modification, sets up the related of gateway control session and IP-CAN session, and with strategy and the charging PCC rule downloading of this IP-CAN session in new Access Network to P-GW.

2. method according to claim 1 is characterized in that, said MAG is gateway S-GW, also comprises before this method:

S-GW sends gateway control session to PCRF and sets up request.

3. method according to claim 1 is characterized in that, said MAG is gateway S-GW, also comprises before this method:

S-GW sends gateway control session to PCRF and sets up request, and resident among the said S-GW have bearing binding and an event reporting function BBERF.

4. method according to claim 1 is characterized in that, also comprises after this method:

5. according to claim 2,3 or 4 described methods; It is characterized in that, judge that current request is that the foundation of the interdepartmental system request during the many PDN of single APN connect comprises: the address of wireless access type RAT or RAT and Mobile Access Gateway MAG and default bearing ID parameter.

6. according to claim 1,2,3 or 4 described methods, it is characterized in that the said gateway control session of setting up specifically comprises with the related of IP-CAN session:

7. according to claim 2 or 3 described methods; It is characterized in that said S-GW sets up address information and the default bearing ID that carries APN, network access Identifier NAI, wireless access type RAT, Mobile Access Gateway MAG in the request to the gateway control session that PCRF sends.

8. realize the system that interdepartmental system switches in the grouping system of an evolution; It is characterized in that; This system comprises the authentication and authorization charging server AAA of user equipment (UE), mobile management unit MME, Mobile Access Gateway MAG, grouped data network gateway P-GW, "Policy and Charging Rules Function PCRF and home subscriber server HSS/3GPP; Wherein

P-GW receives the agent binding update messages from MAG, initiates the indication of IP-CAN session modification to PCRF, receives strategy and charging PCC rule that PCRF returns;

9. system according to claim 8 is characterized in that,

When triggering new PDN connection in the network of said UE in current access,

When detecting between occurring network, said UE switches,

10. according to Claim 8 or 9 described systems, it is characterized in that said MAG is S-GW in the 3GPP system, wherein resident have bearing binding and an event reporting function BBERF; Among the said P-GW resident have the strategy and charge execution function PCEF.