CN101720115A

CN101720115A - Method and system for reestablishing connection of packet data network

Info

Publication number: CN101720115A
Application number: CN200910078720A
Authority: CN
Inventors: 周晓云; 宗在峰; 芮通
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-03-02
Filing date: 2009-03-02
Publication date: 2010-06-02
Anticipated expiration: 2029-03-02
Also published as: CN101720115B

Abstract

The invention discloses a method and a system for reestablishing the connection of a packet data network. In the scheme of the invention, when UE is in cross-system switching, a P-GW confirms that the UE establishes a plurality of PDN connections aiming at the same APN by a 3GPP access system and provides a credible non-3GPP access system with the information of the PDN connections established aiming at a corresponding APN; and the credible non-3GPP access system reestablishes all the PDN connections aiming at the corresponding APN for the UE according to the information provided by the P-GW. Accordingly, if the UE establishes a plurality of PDN connections aiming at the same APN when accessing by the 3GPP access system and is switched to the credible non-3GPP access system, the credible non-3GPP access system can reestablish all the PDN connections established aiming at the corresponding APN for the UE without any influence on the correlated processing in the prior 3GPP system on the premise that the exchange number of an MME and an HSS is not increased.

Description

A kind of method and system of rebuilding the packet data network connection

Technical field

The present invention relates to third generation partner program (3GPP, 3rd Generation Partnership Project) grouping system (EPS of evolution, Evolved Packet System), be meant the method and system that a kind of reconstruction packet data network (PDN, Packet Data Network) connects especially.

Background technology

3GPP EPS is by the universal mobile telecommunications system 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 or PDN GW, Packet Data Network Gateway), home subscriber server (HSS, Home Subscriber Server), authentication and authorization charging (the AAA of 3GPP, Authentication, Authorization and Accounting) server, "Policy and Charging Rules Function (PCRF, Policy andCharging Rules Function) entity and other support nodes are formed.

Wherein, MME is used for chain of command related works such as the processing of mobile management, Non-Access Stratum signaling and the contextual management of user's mobile management; S-GW is the accessing gateway equipment that links to each other with E-UTRAN, transmits data between E-UTRAN and P-GW, and is used for pending datas such as paging are carried out buffer memory; P-GW then is the borde gateway of EPS and PDN, and the access that is used for PDN reaches functions such as transmitting data between EPS and PDN.

EPS supports the intercommunication with non-3 GPP system.Realize that by S2a, S2b, S2c interface P-GW is as the anchor point between 3GPP system and the non-3 GPP system with the intercommunication of non-3 GPP system.The EPS framework as shown in Figure 1.Wherein, non-3 GPP system is divided into the non-3GPP connecting system of trusted and trustless non-3GPP connecting system.The non-3GPP connecting system of trusted can directly be connected with P-GW by the S2a interface; Trustless non-3GPP connecting system need link to each other with P-GW through the packet data gateway (ePDG, Evolved PacketData Gateway) of evolution, is the S2b interface between ePDG and the P-GW.The S2c interface provides subscriber equipment (UE, User Equipment) with P-GW between relevant control and the mobility support of user's face, the mobility management protocol of supporting is for supporting the mobile IP v 6 (DSMIPv6, Moblie IPv6support for dual stack Hosts and Routers) of two stacks.

EPS supports Multiple PDN to insert, and that is to say, UE can be linked among a plurality of PDN by a plurality of P-GW or P-GW simultaneously, promptly set up PDN connects; And EPS supports UE can insert same PDN many times simultaneously, promptly set up a plurality of PDN connects.In the 3GPP system, can determine corresponding PDN by APN (APN, Access Point Name), therefore, can think that UE can insert same APN many times simultaneously, promptly set up a plurality of PDN and connect at same APN.

The continuity of business when interdepartmental system taking place switch in order to ensure UE, the sign that the PDN that network is set up UE connects selected P-GW is connected correspondence with this PDN APN is stored among the HSS.When UE interdepartmental system takes place switched, HSS can set up UE in origin system PDN connected the related network elements that pairing APN and P-GW sign send to the purpose system, to be used for the reconstruction that UE connects at the PDN of purpose system.

When UE inserts by E-UTRAN, in order to reduce mutual with HSS, connect even UE has set up a plurality of PDN at same APN, MME also only be this APN with HSS alternately once, promptly store once the corresponding record of the sign of this APN and selected P-GW among the HSS.If this moment, UE switched to non-3 GPP system from the 3GPP system, and in non-3 GPP system, can initiate to rebuild the processing that PDN connects by non-3 GPP system.The PDN that sets up when but inserting by E-URTAN owing to UE connects, in HSS, only stored the corresponding record of the sign of APN and selected P-GW, when this corresponding record sends to the gateway device of non-3 GPP system, the gateway device of non-3 GPP system can only be the PDN connection that UE rebuilds a corresponding A PN according to the corresponding record of receiving, like this, Ye Wu continuity can't keep.In addition, for the reconstruction PDN connection in non-3 GPP system of UE initiation, when the number that the PDN that rebuilds as UE connects had surpassed the number of the PDN connection of setting up in the 3GPP system, the gateway device of non-3 GPP system also can't be judged the generation of this mistake.

At present, in order to address this problem, the scheme of generally taking is, connect when UE sets up a PDN at certain APN in the 3GPP system, so MME just with HSS alternately once, APN and selected P-GW address are saved in HSS.That is to say that UE has set up several PDN at an APN and connected in the 3GPP system, MME just with HSS alternately several times, and preserve the record of corresponding umber at HSS.When UE interdepartmental system takes place switched, the record of the corresponding umber that HSS will store sent in the gateway device of non-3 GPP system, and gateway device is rebuild all PDN connections according to the UE that is recorded as that receives.And non-3 GPP system judges according to the record of the corresponding umber of HSS storage whether the number of the PDN connection that UE rebuilds has exceeded the number of the PDN connection of setting up in the 3GPP system.

Connect in order to distinguish the different PDN that sets up at same APN, UE or 3GPP system also can modify corresponding APN.When inserting as the first time is APN, is APN:1 when inserting for the second time, is APN:2 when inserting for the third time ....Like this, the corresponding record that first PDN that stores in HSS connects is (APN, P-GW sign), and the corresponding record of second PDN connection is (APN:1, a P-GW sign).UE can both be interpreted as that with the 3GPP system a plurality of PDN at same APN are connected.When interdepartmental system taking place switch, HSS sends to the gateway device of non-3 GPP system with the record of correspondence, and gateway device connects according to being recorded as a plurality of PDN that UE rebuilds at corresponding APN.

But the major defect of such processing scheme is exactly to have increased MME and the mutual number of times of HSS, and because MME need connect at each PDN that UE sets up and HSS carries out alternately, causes the influence of relevant treatment in the existing 3GPP system bigger.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and system of the PDN of reconstruction connection, need not to increase under the prerequisite of MME and HSS interaction times, when realizing that UE interdepartmental system takes place switches, is that all PDN that UE rebuilds at same APN connect by the non-3GPP connecting system of trusted.

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

A kind of method of rebuilding packet data network PDN connection, when interdepartmental system takes place and switches in user equipment (UE), this method comprises: when grouped data network gateway P-GW determines that described UE has set up a plurality of PDN and connects at same APN APN by third generation partner program 3GPP connecting system, and the information that provides the PDN that sets up at described APN to connect to the non-3GPP connecting system of trusted; The described information that the non-3GPP connecting system of trusted provides according to P-GW is that a plurality of PDN that UE rebuilds at described APN connect.

Described P-GW provides before the information of the PDN connection of setting up at APN to the non-3GPP connecting system of trusted, further comprise: the non-3GPP connecting system of trusted provides wireless access technology RAT type to P-GW, P-GW judges that according to described RAT type the non-3GPP connecting system of the described trusted many PDN whether network enabled is initiated connect foundation, if support, then provide the information of the PDN connection of setting up at APN to the non-3GPP connecting system of trusted; Otherwise, the information that does not provide the PDN that sets up at APN to connect to the non-3GPP connecting system of trusted.

When the process that reconstruction PDN connects is initiated by UE, the information that the non-3GPP connecting system of described trusted provides according to P-GW is that UE rebuilds before PDN at APN connects, further comprise: the information that the non-3GPP connecting system of trusted provides according to P-GW, and current information at the PDN connection of described APN of having rebuild for UE, when definite UE of permission rebuilds at the PDN connection of described APN, be that UE rebuilds the PDN connection at described APN.

The described APN that carries in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process according to UE determines to rebuild the process that PDN connects and is initiated by UE; And/or the switching designator that the non-3GPP connecting system of trusted carries in request message according to UE determines that current needs are that UE rebuilds the PDN connection.

Described P-GW comprises to the information that the non-3GPP connecting system of trusted provides the PDN that sets up at described APN to connect: the information that P-GW directly provides the PDN that sets up at described APN to connect to the non-3GPP connecting system of trusted; Perhaps, P-GW provides the information of the PDN connection of setting up at described APN to the non-3GPP connecting system of trusted by aaa server.

Described P-GW, comprising to the information that the non-3GPP connecting system of trusted provides the PDN that sets up at described APN to connect by aaa server: the information that P-GW provides the PDN that sets up at described APN to connect to aaa server; The information that the PDN that sets up at described APN that aaa server is received to the non-3GPP connecting system forwarding of trusted connects.

The information that the described PDN that sets up at described APN connects is: the information that all PDN that set up at described APN connect; Perhaps, the information that the PDN that sets up at described APN, remove the HSS storage connects.

Described P-GW determines that it is to realize by the record of self storing that UE has set up a plurality of PDN connections by the 3GPP connecting system at same APN.

A kind of system that rebuilds the PDN connection, when interdepartmental system takes place and switches in UE, this system comprises: the non-3GPP connecting system of P-GW and trusted, wherein, described P-GW comprises that information provides the unit, when being used for determining that this UE has set up a plurality of PDN and connects at same APN by the 3GPP connecting system, the information that provides the PDN that sets up at described APN to connect to the non-3GPP connecting system of trusted; It is that a plurality of PDN that UE rebuilds at described APN connect that the non-3GPP connecting system of described trusted is used for according to the described information that P-GW provides.

Described system further comprises: the information that connects to the PDN that the UE that the non-3GPP connecting system of trusted is transmitted the information of P-GW and provided the unit to provide sets up at same APN is provided aaa server.

Described P-GW further comprises judging unit, be used for judging that according to the RAT type that the non-3GPP connecting system of trusted provides the non-3GPP connecting system of the described trusted many PDN whether network enabled is initiated connect foundation, if support, then provide the information of the PDN connection of setting up at APN to the non-3GPP connecting system of trusted; Otherwise, the information that does not provide the PDN that sets up at APN to connect to the non-3GPP connecting system of trusted.

When the process that reconstruction PDN connects is initiated by UE, the information that the non-3GPP connecting system of described trusted is further used for providing according to P-GW, and the information that connects of the current PDN at described APN that has rebuild for UE determine whether to allow UE to rebuild PDN connection at described APN.

Described system further comprises HSS, is used for the record that connects to the PDN that the non-3GPP connecting system of trusted provides the APN of storage to set up.

Among the present invention program, when interdepartmental system takes place and switches in UE, when P-GW determines that this UE has set up a plurality of PDN and connects at same APN by the 3GPP connecting system, the information of the PDN connection of setting up at corresponding A PN is provided to the non-3GPP connecting system of trusted, the record that the PDN that sets up at corresponding A PN that the non-3GPP connecting system of trusted is stored according to HSS connects, and the described information that P-GW provides is that all PDN that UE rebuilds at corresponding A PN connect, this shows, if having set up a plurality of PDN at same APN when UE inserts by the 3GPP connecting system connects, when UE switches to the non-3GPP connecting system of trusted, need not to increase under the prerequisite of MME and HSS interaction times, the non-3GPP connecting system of trusted just can be that UE rebuilds all PDN that set up at corresponding A PN and connects, to the relevant treatment in the existing 3GPP system without any influence; And UE also need not to carry out alternately with HSS after initiating interdepartmental system switching.

Further, when the process that reconstruction PDN connects is initiated by UE, the information that the non-3GPP connecting system of trusted can provide according to P-GW, and current information at the PDN connection of APN of having rebuild for UE, when definite UE of permission rebuilds at the PDN connection of APN, the PDN that rebuilds at described APN for UE connects, whether the number that the PDN that makes the non-3GPP connecting system of trusted can find in time that UE rebuilds connects has surpassed the number of the PDN connection of setting up in the 3GPP connecting system, to avoid wrong generation.

Description of drawings

Fig. 1 is the EPS configuration diagram;

Fig. 2 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention one;

Fig. 3 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention two;

Fig. 4 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention three;

Fig. 5 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention four;

Fig. 6 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention five;

Fig. 7 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention six;

Fig. 8 is for realizing rebuilding the system configuration schematic diagram that PDN connects among the present invention.

Embodiment

Among the present invention, when interdepartmental system takes place and switches in UE, when P-GW determines that this UE has set up a plurality of PDN and connects at same APN by the 3GPP connecting system, to the information that the non-3GPP connecting system of trusted provides the PDN that sets up at corresponding A PN to connect, the described information that record that the non-3GPP connecting system of trusted connects according to the PDN that sets up at corresponding A PN of HSS storage and P-GW provide is that all PDN that UE rebuilds at corresponding A PN connect.

The information that P-GW can directly set up UE at same APN PDN connects offers the non-3GPP connecting system of trusted, and also the information that can connect by aaa server is set up UE at same APN PDN offers the non-3GPP connecting system of trusted.

The information that the PDN that sets up at same APN that P-GW provides connects can be the information that connects at all PDN that same APN sets up; Also can set up, remove the information of the PDN connection of HSS storage at same APN.

Fig. 2 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention one, as shown in Figure 2, what present embodiment was described is that UE switches to the non-3GPP connecting system of trusted by the 3GPP connecting system, wherein, UE has set up 2 PDN by the 3GPP connecting system at APN1 and has connected, and APN1 is the acquiescence APN of UE.After UE switches to the non-3GPP connecting system of trusted, be two PDN connections that UE is reconstructed into APN1 by the non-3GPP connecting system of trusted.The concrete processing procedure of rebuilding the PDN connection in the present embodiment may further comprise the steps:

Step 201:UE in the 3GPP connecting system, by P-GW set up with the acquiescence APN1 2 PDN be connected.Only store the corresponding record of an APN1 and P-GW sign among the HSS, but in P-GW, stored the record that two PDN at APN1 connect.

Step 202:UE finds the non-3GPP connecting system of trusted, and initiates interdepartmental system switching.

Step 203:UE carries out access authentication in the non-3GPP connecting system of trusted.The HSS/AAA server carries out access authentication to UE, and UE is by behind the access authentication, the information that the PDN that HSS provides corresponding UE to set up in the 3GPP connecting system to the non-3GPP connecting system of trusted connects, the i.e. sign of APN1 and selected P-GW.

Layer 3 attaching process of step 204:UE are triggered, and UE does not carry any APN information in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process.

Step 205: the information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects, send the agent binding update request to P-GW corresponding to the P-GW sign, carry APN1, network access Identifier (NAI in this agent binding update request, Network Access Identifier) and wireless access technology (RAT, Radio Access Technology) type (RAT Type).

After step 206:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 1 for the first time for UE.

Layer 3 attaching process of step 207:UE are finished.

After step 208:P-GW receives the agent binding update request of step 205 transmission, according to the record of self storing, determine that having set up 2 PDN at APN1 when UE passes through the access of 3GPP connecting system connects, therefore, P-GW sends message to aaa server, the information that the PDN that notice aaa server UE sets up at APN1 by the 3GPP connecting system connects, the information that the information that should connect at the PDN that APN1 sets up can connect for all PDN that set up at APN1, also the information that can connect for the residue PDN that sets up at APN1 is promptly set up at APN1, remove the information of the PDN connection of HSS storage.Because P-GW provides in the 3GPP connecting system to the non-3GPP connecting system of trusted in step 206 and has inserted APN1 institute IP address allocated 1 for the first time for UE, therefore, P-GW can determine the information that connects at PDN APN1 foundation, that remove the HSS storage in this step.Aaa server can return acknowledge message to P-GW after the information of receiving is stored.

When determining that UE passes through the 3GPP connecting system and inserts, set up after 2 PDN connect P-GW at APN1, the RAT type that can receive according to step 205 is further judged the purpose system, is that the non-3GPP connecting system of the trusted many PDN whether network enabled is initiated connect foundation, if support, then continue to send message the information that the PDN that notice aaa server UE sets up at APN1 by the 3GPP connecting system connects to aaa server; If do not support, then do not send message to aaa server, and execution in step 209～step 211 not.

After P-GW receives agent binding update request in the step 205, when inserting, only set up 1 PDN connection, then execution in step 208～step 211 not at APN1 by the 3GPP connecting system if determine UE.

The information that the PDN that sets up at APN1 that step 209:AAA server provides according to P-GW connects, the information that the PDN that provides UE to set up at APN1 to the non-3GPP connecting system of trusted connects.In this step, aaa server does not need to carry out alternately with HSS, thereby has reduced the interaction times with HSS.

Step 210: the non-3GPP connecting system of trusted determines that current other PDN that need be UE sets up at APN1 connect after receiving the information that PDN that UE that aaa server provides sets up at APN1 connects; The non-3GPP connecting system of trusted sends the agent binding update request to P-GW, carries APN1, NAI and RAT type in this agent binding update request.

If aaa server provides the information of UE at all PDN connections of APN1 foundation, the non-3GPP connecting system of trusted according in the 3GPP connecting system that provides in the P-GW step 206 for UE insert for the first time APN1 institute IP address allocated 1, and information in the quantity that connects of the PDN that comprises, determine current also the needs to connect for UE sets up several PDN at APN1.The information that PDN that UE sets up at APN1, that remove the HSS storage connects if aaa server provides, then the non-3GPP connecting system of trusted can be determined current also the needs and set up several PDN connections at APN1 for UE directly according to the quantity of the PDN connection that comprises in the information.Like this, also need set up several PDN at APN1 connects, the non-3GPP connecting system of trusted just sends several agent binding update requests to P-GW, and follow-up P-GW returns a UE at every agent binding update request to the non-3GPP connecting system of trusted and inserts APN1 institute IP address allocated.

After step 211:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 2 for the second time for UE.

Though having set up 2 PDN at APN1, UE connects, but because P-GW provides in the 3GPP connecting system to the non-3GPP connecting system of trusted in step 206 and has inserted APN1 institute IP address allocated 1 for the first time for UE, therefore, P-GW the UE that does not provide to the non-3GPP connecting system of trusted can be provided also insert APN1 institute IP address allocated in this step, determines that current need providing in the 3GPP connecting system to the non-3GPP connecting system of trusted insert APN1 institute IP address allocated 2 for the second time for UE.

Step 212: the non-3GPP connecting system of trusted is that UE sets up radio bearer at 2 PDN connections that APN1 sets up.The non-3GPP connecting system of trusted can be after receiving the IP address of UE at all PDN connection correspondences of APN1 foundation that P-GW provides, and the unified UE of being sets up each PDN connection at APN1; Also can be after UE inserts APN1 institute IP address allocated 1 for the first time in receiving the 3GPP connecting system that P-GW provides, just can connect and set up radio bearer for first PDN that UE sets up at APN1; Then, be after UE inserts APN1 institute IP address allocated 2 for the second time in receiving the 3GPP connecting system, set up radio bearer for UE at second PDN connection that APN1 sets up again.

Describe as seen according to above flow process, when UE sets up a plurality of PDN and connects at same APN by the 3GPP connecting system, need not to increase the interaction times of MME and HSS at all, to having relevant treatment in the 3GPP system now without any influence; UE also need not to carry out alternately with HSS after initiating interdepartmental system switching.

Fig. 3 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention two, as shown in Figure 3, what present embodiment was described is that UE switches to the non-3GPP connecting system of trusted by the 3GPP connecting system, wherein, UE has set up 1 PDN connection, has set up 2 PDN connections at APN2 at APN1 by the 3GPP connecting system, and wherein APN1 is the acquiescence APN of UE.After UE switches to the non-3GPP connecting system of trusted, be that UE rebuilds that 1 PDN at APN1 connects and connects at 2 PDN of APN2 by the non-3GPP connecting system of trusted.The concrete processing procedure of rebuilding the PDN connection in the present embodiment may further comprise the steps:

Step 301:UE in the 3GPP connecting system, by P-GW1 set up with the acquiescence APN1 1 PDN be connected; Set up with 2 PDN of APN2 by P-GW2 and to be connected.2 PDN that set up at APN2 connect, and have only stored the corresponding record of an APN2 and P-GW2 address among the HSS, but have stored the record that two PDN at APN2 connect in P-GW2.

Step 302:UE finds the non-3GPP connecting system of trusted, and initiates interdepartmental system switching.

Step 303:UE carries out access authentication in the non-3GPP connecting system of trusted.The HSS/AAA server carries out access authentication to UE, and UE is by behind the access authentication, the information that the PDN that HSS provides corresponding UE to set up in the 3GPP connecting system to the non-3GPP connecting system of trusted connects, the i.e. sign of the sign of APN1 and selected P-GW1 and APN2 and selected P-GW2.

Layer 3 attaching process of step 304:UE are triggered, and UE does not carry any APN information in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process.

Step 305: the information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects, send the agent binding update request to P-GW1 corresponding to the P-GW1 sign, carry APN1, NAI and RAT type in this agent binding update request.

After step 306:P-GW1 receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 11 for the first time for UE.

Layer 3 attaching process of step 307:UE are finished.

Step 308: the information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects, send the agent binding update request to P-GW2 corresponding to the P-GW2 sign, carry APN2, NAI and RAT type in this agent binding update request.

After step 309:P-GW2 receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN2 institute IP address allocated 21 for the first time for UE.

After step 310:P-GW2 receives the agent binding update request of step 308 transmission, according to the record of self storing, determine that having set up 2 PDN at APN2 when UE passes through the access of 3GPP connecting system connects, therefore, P-GW2 sends message to aaa server, the information that the PDN that notice aaa server UE sets up at APN2 by the 3GPP connecting system connects, the information that the information that should connect at the PDN that APN2 sets up can connect for all PDN that set up at APN2, also the information that can connect for the residue PDN that sets up at APN2 is promptly set up at APN2, remove the information of the PDN connection of HSS storage.Because P-GW provides in the 3GPP connecting system to the non-3GPP connecting system of trusted in step 309 and has inserted APN2 institute IP address allocated 21 for the first time for UE, therefore, P-GW2 can determine the information that connects at PDN APN2 foundation, that remove the HSS storage in this step.Aaa server can return acknowledge message to P-GW2 after the information of receiving is stored.

When determining that UE passes through the 3GPP connecting system and inserts, set up after 2 PDN connect P-GW2 at APN2, the RAT type that can receive according to step 308 is further judged the purpose system, is that the non-3GPP connecting system of the trusted many PDN whether network enabled is initiated connect foundation, if support, then continue to send message the information that the PDN that notice aaa server UE sets up at APN2 by the 3GPP connecting system connects to aaa server; If do not support, then do not send message to aaa server, and execution in step 311～step 313 not.

After P-GW receives agent binding update request in the step 308, when inserting, only set up 1 PDN connection, then execution in step 310～step 313 not at APN2 by the 3GPP connecting system if determine UE.

The information that the PDN that sets up at APN2 that step 311:AAA server provides according to P-GW2 connects, the information that the PDN that provides UE to set up at APN2 to the non-3GPP connecting system of trusted connects.In this step, aaa server does not need to carry out alternately with HSS, thereby has reduced the interaction times with HSS.

Step 312: the non-3GPP connecting system of trusted determines that current other PDN that need be UE sets up at APN2 connect after receiving the information that PDN that UE that aaa server provides sets up at APN2 connects; The non-3GPP connecting system of trusted sends the agent binding update request to P-GW2, carries APN2, NAI and RAT type in this agent binding update request.

If aaa server provides the information of UE at all PDN connections of APN2 foundation, the non-3GPP connecting system of trusted according in the 3GPP connecting system that provides in the P-GW2 step 309 for UE insert for the first time APN2 institute IP address allocated 21, and information in the quantity that connects of the PDN that comprises, determine current also the needs to connect for UE sets up several PDN at APN2.The information that PDN that UE sets up at APN2, that remove the HSS storage connects if aaa server provides, then the non-3GPP connecting system of trusted can be determined current also the needs and set up several PDN connections at APN2 for UE directly according to the quantity of the PDN connection that comprises in the information.Like this, also need set up several PDN at APN2 connects, the non-3GPP connecting system of trusted just sends several agent binding update requests to P-GW2, and follow-up P-GW2 returns a UE at every agent binding update request to the non-3GPP connecting system of trusted and inserts APN2 institute IP address allocated.

After step 313:P-GW2 receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN2 institute IP address allocated 22 for the second time for UE.

Though having set up 2 PDN at APN2, UE connects, but because P-GW2 provides in the 3GPP connecting system to the non-3GPP connecting system of trusted in step 309 and has inserted APN2 institute IP address allocated 21 for the first time for UE, therefore, P-GW2 the UE that does not provide to the non-3GPP connecting system of trusted can be provided also insert APN2 institute IP address allocated in this step, determines that current need providing in the 3GPP connecting system to the non-3GPP connecting system of trusted insert APN2 institute IP address allocated 22 for the second time for UE.

Step 314: the non-3GPP connecting system of trusted is that UE connects, sets up radio bearer at 2 PDN connections of APN2 foundation at 1 PDN that APN1 sets up.The non-3GPP connecting system of trusted can just be that UE sets up the PDN connection at corresponding A PN after receiving the IP address of UE at each PDN connection correspondence of each APN foundation that each P-GW provides; Also can be after receiving that all PDN at each APN connect corresponding IP address, unified each PDN that sets up at each APN for UE connects.

Fig. 4 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention three, as shown in Figure 4, what present embodiment was described is that UE switches to the non-3GPP connecting system of trusted by the 3GPP connecting system, wherein, UE has set up 2 PDN by the 3GPP connecting system at APN1 and has connected, and APN1 is the acquiescence APN of UE.After UE switches to the non-3GPP connecting system of trusted, be two PDN connections that UE is reconstructed into APN1 by the non-3GPP connecting system of trusted.The concrete processing procedure of rebuilding the PDN connection in the present embodiment may further comprise the steps:

Step 401:UE in the 3GPP connecting system, by P-GW set up with the acquiescence APN1 2 PDN be connected.Only store the corresponding record of an APN1 and P-GW sign among the HSS, but in P-GW, stored the record that two PDN at APN1 connect.

Step 402:UE finds the non-3GPP connecting system of trusted, and initiates interdepartmental system switching.

Step 403:UE carries out access authentication in the non-3GPP connecting system of trusted.The HSS/AAA server carries out access authentication to UE, and UE is by behind the access authentication, the information that the PDN that HSS provides corresponding UE to set up in the 3GPP connecting system to the non-3GPP connecting system of trusted connects, the i.e. sign of APN1 and selected P-GW.

Layer 3 attaching process of step 404:UE are triggered, and UE does not carry any APN information in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process.

Step 405: the information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects, send the agent binding update request to P-GW corresponding to the P-GW sign, carry APN1, NAI and RAT type in this agent binding update request.

After step 406:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, and according to the record of self storing, determine that having set up 2 PDN at APN1 when UE passes through the access of 3GPP connecting system connects, therefore, P-GW not only carries in the 3GPP connecting system in the proxy binding acknowledgment messages that the non-3GPP connecting system of trusted returns and inserts APN1 institute IP address allocated 1 for the first time for UE, also carry UE by the information of 3GPP connecting system at the PDN connection of APN1 foundation, the information that the information that should connect at the PDN that APN1 sets up can connect for all PDN that set up at APN1, also the information that can connect for the residue PDN that sets up at APN1 is promptly set up at APN1, remove the information of the PDN connection of HSS storage.In this step, P-GW does not need to carry out alternately with HSS, thereby has reduced the interaction times with HSS.

Layer 3 attaching process of step 407:UE are finished.

Step 408: the non-3GPP connecting system of trusted determines that current also the needs is that other PDN that UE sets up at APN1 connect after receiving the information that PDN that UE that P-GW provides sets up at APN1 connects; The non-3GPP connecting system of trusted sends the agent binding update request to P-GW, carries APN1, NAI and RAT type in this agent binding update request.

If P-GW provides the information of UE at all PDN connections of APN1 foundation, the non-3GPP connecting system of trusted according in the 3GPP connecting system that provides in the P-GW step 406 for UE insert for the first time APN1 institute IP address allocated 1, and information in the quantity that connects of the PDN that comprises, determine current also the needs to connect for UE sets up several PDN at APN1.The information that PDN that UE sets up at APN1, that remove the HSS storage connects if P-GW provides, then the non-3GPP connecting system of trusted can be determined current also the needs and set up several PDN connections at APN1 for UE directly according to the quantity of the PDN connection that comprises in the information.Like this, also need set up several PDN at APN1 connects, the non-3GPP connecting system of trusted just sends several agent binding update requests to P-GW, and follow-up P-GW returns a UE at every agent binding update request to the non-3GPP connecting system of trusted and inserts APN1 institute IP address allocated.

After step 409:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 2 for the second time for UE.

Though having set up 2 PDN at APN1, UE connects, but because P-GW provides in the 3GPP connecting system to the non-3GPP connecting system of trusted in step 406 and has inserted APN1 institute IP address allocated 1 for the first time for UE, therefore, P-GW the UE that does not provide to the non-3GPP connecting system of trusted can be provided also insert APN1 institute IP address allocated in this step, determines that current need providing in the 3GPP connecting system to the non-3GPP connecting system of trusted insert APN1 institute IP address allocated 2 for the second time for UE.

Step 410: the non-3GPP connecting system of trusted is that UE sets up radio bearer at 2 PDN connections that APN1 sets up.The non-3GPP connecting system of trusted can be after receiving the IP address of UE at all PDN connection correspondences of APN1 foundation that P-GW provides, and the unified UE of being sets up each PDN connection at APN1; Also can be after UE inserts APN1 institute IP address allocated 1 for the first time in receiving the 3GPP connecting system that P-GW provides, just can connect and set up radio bearer for first PDN that UE sets up at APN1; Then, be after UE inserts APN1 institute IP address allocated 2 for the second time in receiving the 3GPP connecting system, set up radio bearer for UE at second PDN connection that APN1 sets up again.

Fig. 5 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention four, as shown in Figure 5, what present embodiment was described is that UE switches to the non-3GPP connecting system of trusted by the 3GPP connecting system, wherein, UE has set up 1 PDN connection, has set up 2 PDN connections at APN2 at APN1 by the 3GPP connecting system, and wherein APN1 is the acquiescence APN of UE.After UE switches to the non-3GPP connecting system of trusted, be that UE rebuilds that 1 PDN at APN1 connects and connects at 2 PDN of APN2 by the non-3GPP connecting system of trusted.The concrete processing procedure of rebuilding the PDN connection in the present embodiment may further comprise the steps:

Step 501:UE in the 3GPP connecting system, by P-GW1 set up with the acquiescence APN1 1 PDN be connected; Set up with 2 PDN of APN2 by P-GW2 and to be connected.2 PDN that set up at APN2 connect, and have only stored the corresponding record of an APN2 and P-GW2 sign among the HSS, but have stored the record that two PDN at APN2 connect in P-GW2.

Step 502:UE finds the non-3GPP connecting system of trusted, and initiates interdepartmental system switching.

Step 503:UE carries out access authentication in the non-3GPP connecting system of trusted.The HSS/AAA server carries out access authentication to UE, and UE is by behind the access authentication, the information that the PDN that HSS provides corresponding UE to set up in the 3GPP connecting system to the non-3GPP connecting system of trusted connects, the i.e. sign of the sign of APN1 and selected P-GW1 and APN2 and selected P-GW2.

Layer 3 attaching process of step 504:UE are triggered, and UE does not carry any APN information in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process.

Step 505: the information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects, send the agent binding update request to P-GW1 corresponding to the P-GW1 sign, carry APN1, NAI and RAT type in this agent binding update request.

After step 506:P-GW1 receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 11 for the first time for UE.

Layer 3 attaching process of step 507:UE are finished.

Step 508: the information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects, send the agent binding update request to P-GW2 corresponding to the P-GW2 sign, carry APN2, NAI and RAT type in this agent binding update request.

After step 509:P-GW2 receives the agent binding update request, upgrade the cache entries of binding for UE, and according to the record of self storing, determine that having set up 2 PDN at APN2 when UE passes through the access of 3GPP connecting system connects, therefore, P-GW2 not only carries in the 3GPP connecting system in the proxy binding acknowledgment messages that the non-3GPP connecting system of trusted returns and inserts APN2 institute IP address allocated 21 for the first time for UE, also carry UE by the information of 3GPP connecting system at the PDN connection of APN2 foundation, the information that the information that should connect at the PDN that APN2 sets up can connect for all PDN that set up at APN2, also the information that can connect for the residue PDN that sets up at APN2 is promptly set up at APN2, remove the information of the PDN connection of HSS storage.In this step, P-GW2 does not need to carry out alternately with HSS, thereby has reduced the interaction times with HSS.

Step 510: the non-3GPP connecting system of trusted determines that current also the needs is that other PDN that UE sets up at APN2 connect after receiving the information that PDN that UE that P-GW2 provides sets up at APN2 connects; The non-3GPP connecting system of trusted sends the agent binding update request to P-GW2, carries APN2, NAI and RAT type in this agent binding update request.

If P-GW2 provides the information of UE at all PDN connections of APN2 foundation, in the 3GPP connecting system that the non-3GPP connecting system of trusted provides according to P-GW2 for UE insert for the first time APN2 institute IP address allocated 21, and information in the quantity that connects of the PDN that comprises, determine current also the needs to connect for UE sets up several PDN at APN2.The information that PDN that UE sets up at APN1, that remove the HSS storage connects if P-GW2 provides, then the non-3GPP connecting system of trusted can be determined current also the needs and set up several PDN connections at APN2 for UE directly according to the quantity of the PDN connection that comprises in the information.Like this, also need set up several PDN at APN2 connects, the non-3GPP connecting system of trusted just sends several agent binding update requests to P-GW2, and follow-up P-GW2 returns a UE at every agent binding update request to the non-3GPP connecting system of trusted and inserts APN2 institute IP address allocated.

After step 511:P-GW2 receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN2 institute IP address allocated 22 for the second time for UE.

Though having set up 2 PDN at APN2, UE connects, but because P-GW2 provides in the 3GPP connecting system to the non-3GPP connecting system of trusted and has inserted APN2 institute IP address allocated 21 for the first time for UE, therefore, P-GW2 the UE that does not provide to the non-3GPP connecting system of trusted can be provided also insert APN2 institute IP address allocated in this step, determines that current need providing in the 3GPP connecting system to the non-3GPP connecting system of trusted insert APN2 institute IP address allocated 22 for the second time for UE.

Step 512: the non-3GPP connecting system of trusted is that UE connects, sets up radio bearer at 2 PDN connections of APN2 foundation at 1 PDN that APN1 sets up.The non-3GPP connecting system of trusted can just be that UE sets up the PDN connection at corresponding A PN after receiving the IP address of UE at each PDN connection correspondence of each APN foundation that each P-GW provides; Also can be after receiving that all PDN at each APN connect corresponding IP address, unified each PDN that sets up at each APN for UE connects.

Fig. 6 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention five, as shown in Figure 6, what present embodiment was described is that UE switches to the non-3GPP connecting system of trusted by the 3GPP connecting system, wherein, UE has set up 2 PDN by the 3GPP connecting system at APN1 and has connected, and APN1 is the acquiescence APN of UE.After UE switched to the non-3GPP connecting system of trusted, two PDN that are reconstructed into APN1 by the UE initiation connected, and when UE prepared to initiate to rebuild the 3rd PDN connection, non-3GPP connecting system refusal was set up.The concrete processing procedure of rebuilding the PDN connection in the present embodiment may further comprise the steps:

Step 601:UE in the 3GPP connecting system, by P-GW set up with the acquiescence APN1 2 PDN be connected.Only store the corresponding record of an APN1 and P-GW sign among the HSS, but in P-GW, stored the record that two PDN at APN1 connect.

Step 602:UE finds the non-3GPP connecting system of trusted, and initiates interdepartmental system switching.

Step 603:UE carries out access authentication in the non-3GPP connecting system of trusted.The HSS/AAA server carries out access authentication to UE, and UE is by behind the access authentication, the information that the PDN that HSS provides corresponding UE to set up in the 3GPP connecting system to the non-3GPP connecting system of trusted connects, the i.e. sign of APN1 and selected P-GW.

Layer 3 attaching process of step 604:UE are triggered, and UE carries APN1 in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process.

Step 605: the non-3GPP connecting system of trusted determines that according to the APN1 that carries in the step 604 step message process of reconstruction PDN connection is initiated by UE.The information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects sends the agent binding update request to the P-GW corresponding to the P-GW sign, carries APN1, NAI and RAT type in this agent binding update request.

After step 606:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 1 for the first time for UE.

Layer 3 attaching process of step 607:UE are finished.

After step 608:P-GW receives the agent binding update request of step 605 transmission, according to the record of self storing, determine that having set up 2 PDN at APN1 when UE passes through the access of 3GPP connecting system connects, therefore, P-GW sends message to aaa server, the information that the PDN that notice aaa server UE sets up at APN1 by the 3GPP connecting system connects, the information that the information that should connect at the PDN that APN1 sets up can connect for all PDN that set up at APN1, also the information that can connect for the residue PDN that sets up at APN1 is promptly set up at APN1, remove the information of the PDN connection of HSS storage.Because P-GW provides in the 3GPP connecting system to the non-3GPP connecting system of trusted in step 606 and has inserted APN1 institute IP address allocated 1 for the first time for UE, therefore, P-GW can determine the information that connects at PDN APN1 foundation, that remove the HSS storage in this step.Aaa server can return acknowledge message to P-GW after the information of receiving is stored.

The information that the PDN that sets up at APN1 that step 609:AAA server provides according to P-GW connects, the information that the PDN that provides UE to set up at APN1 to the non-3GPP connecting system of trusted connects.In this step, aaa server does not need to carry out alternately with HSS, thereby has reduced the interaction times with HSS.

Step 610:UE sends a request message to the non-3GPP connecting system of trusted, triggers and rebuilds the PDN connection, carries APN1 in the request message and switches designator.

Step 611: after the non-3GPP connecting system of trusted is received request message, determine that according to the switching designator that carries in this request message current needs are that UE rebuilds the PDN connection that is directed to APN1, the information that connects of the PDN that sets up at APN1 of the UE that provides according to aaa server, and current information at the PDN connection of APN1 of having rebuild for UE then, determine that promptly UE has set up two PDN connections and current for UE has rebuild a PDN connection at APN1 at APN1 in the 3GPP connecting system, therefore allow UE to rebuild a PDN at APN1 again and connect.The non-3GPP connecting system of trusted sends the agent binding update request to P-GW, carries APN1, NAI and RAT type in this agent binding update request.

After step 612:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 2 for the second time for UE.

Step 613: the non-3GPP connecting system of trusted carries IP address 2 to UE echo reply message in this response message, and notice UE can connect for its second PDN that sets up at APN1.

Step 614:UE continues to send a request message to the non-3GPP connecting system of trusted, triggers and rebuilds the PDN connection, carries APN1 in the request message and switches designator.

Step 615: after the non-3GPP connecting system of trusted is received request message, determine that according to the switching designator that carries in this request message current needs are that UE rebuilds the PDN connection that is directed to APN1, the information that connects of the PDN that sets up at APN1 of the UE that provides according to aaa server then, determine that the current PDN that can not rebuild at APN1 for UE more connects, and returns refuse information to UE.

Step 616: the non-3GPP connecting system of trusted is that UE sets up radio bearer at 2 PDN connections that APN1 sets up.The non-3GPP connecting system of trusted can be after receiving the IP address of UE at all PDN connection correspondences of APN1 foundation that P-GW provides, and the unified UE of being sets up each PDN connection at APN1; Also can be after UE inserts APN1 institute IP address allocated 1 for the first time in receiving the 3GPP connecting system that P-GW provides, just can connect and set up radio bearer for first PDN that UE sets up at APN1; Then, be after UE inserts APN1 institute IP address allocated 2 for the second time in receiving the 3GPP connecting system, set up radio bearer for UE at second PDN connection that APN1 sets up again.

Fig. 7 rebuilds PDN connection procedure interacting message schematic diagram in the embodiment of the invention six, as shown in Figure 7, what present embodiment was described is that UE switches to the non-3GPP connecting system of trusted by the 3GPP connecting system, wherein, UE has set up 2 PDN by the 3GPP connecting system at APN1 and has connected, and APN1 is the acquiescence APN of UE.After UE switches to the non-3GPP connecting system of trusted, initiate to be reconstructed into two PDN connections of APN1 by UE.The concrete processing procedure of rebuilding the PDN connection in the present embodiment may further comprise the steps:

Step 701:UE in the 3GPP connecting system, by P-GW set up with the acquiescence APN1 2 PDN be connected.Only store the corresponding record of an APN1 and P-GW sign among the HSS, but in P-GW, stored the record that two PDN at APN1 connect.

Step 702:UE finds the non-3GPP connecting system of trusted, and initiates interdepartmental system switching.

Step 703:UE carries out access authentication in the non-3GPP connecting system of trusted.The HSS/AAA server carries out access authentication to UE, and UE is by behind the access authentication, the information that the PDN that HSS provides corresponding UE to set up in the 3GPP connecting system to the non-3GPP connecting system of trusted connects, the i.e. sign of APN1 and selected P-GW.

Layer 3 attaching process of step 704:UE are triggered, and UE carries APN1 in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process.

Step 705: the non-3GPP connecting system of trusted determines that according to the APN1 that carries in the step 704 step message process of reconstruction PDN connection is initiated by UE.The information that the PDN that the non-3GPP connecting system of trusted provides according to HSS connects sends the agent binding update request to the P-GW corresponding to the P-GW sign, carries APN1, NAI and RAT type in this agent binding update request.

After step 706:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, and according to the record of self storing, determine that having set up 2 PDN at APN1 when UE passes through the access of 3GPP connecting system connects, therefore, P-GW not only carries in the 3GPP connecting system in the proxy binding acknowledgment messages that the non-3GPP connecting system of trusted returns and inserts APN1 institute IP address allocated 1 for the first time for UE, also carry UE by the information of 3GPP connecting system at the PDN connection of APN1 foundation, the information that the information that should connect at the PDN that APN1 sets up can connect for all PDN that set up at APN1, also the information that can connect for the residue PDN that sets up at APN1 is promptly set up at APN1, remove the information of the PDN connection of HSS storage.In this step, P-GW does not need to carry out alternately with HSS, thereby has reduced the interaction times with HSS.

Layer 3 attaching process of step 707:UE are finished.

Step 708:UE sends a request message to the non-3GPP connecting system of trusted, triggers and rebuilds the PDN connection, carries APN1 in the request message and switches designator.

Step 709: after the non-3GPP connecting system of trusted is received request message, determine that according to the switching designator that carries in this request message current needs are that UE rebuilds the PDN connection that is directed to APN1, the information that connects of the PDN that sets up at APN1 of the UE that provides according to P-GW, and current information at the PDN connection of APN1 of having rebuild for UE then, determine that promptly UE has set up two PDN connections and current for UE has rebuild a PDN connection at APN1 at APN1 in the 3GPP connecting system, therefore allow UE to rebuild a PDN at APN1 again and connect.The non-3GPP connecting system of trusted sends the agent binding update request to P-GW, carries APN1, NAI and RAT type in this agent binding update request.

After step 710:P-GW receives the agent binding update request, upgrade the cache entries of binding for UE, return proxy binding acknowledgment messages to the non-3GPP connecting system of trusted, carry in this proxy binding acknowledgment messages in the 3GPP connecting system and insert APN1 institute IP address allocated 2 for the second time for UE.

Step 711: the non-3GPP connecting system of trusted carries IP address 2 to UE echo reply message in this response message, and notice UE can connect for its second PDN that sets up at APN1.

Step 712:UE continues to send a request message to the non-3GPP connecting system of trusted, triggers and rebuilds the PDN connection, carries APN1 in the request message and switches designator.

Step 713: after the non-3GPP connecting system of trusted is received request message, determine that according to the switching designator that carries in this request message current needs are that UE rebuilds the PDN connection that is directed to APN1, the information that connects of the PDN that sets up at APN1 of the UE that provides according to P-GW then, determine that the current PDN that can not rebuild at APN1 for UE more connects, and returns refuse information to UE.

Step 714: the non-3GPP connecting system of trusted is that UE sets up radio bearer at 2 PDN connections that APN1 sets up.The non-3GPP connecting system of trusted can be after receiving the IP address of UE at all PDN connection correspondences of APN1 foundation that P-GW provides, and the unified UE of being sets up each PDN connection at APN1; Also can be after UE inserts APN1 institute IP address allocated 1 for the first time in receiving the 3GPP connecting system that P-GW provides, just can connect and set up radio bearer for first PDN that UE sets up at APN1; Then, be after UE inserts APN1 institute IP address allocated 2 for the second time in receiving the 3GPP connecting system, set up radio bearer for UE at second PDN connection that APN1 sets up again.

In above each embodiment, UE has set up a plurality of PDN by the 3GPP connecting system at same APN and has connected, UE initiates interdepartmental system when switching, P-GW to the information that the non-3GPP connecting system of trusted or a plurality of PDN that set up at same APN that directly provide to the non-3GPP connecting system of trusted connect, can be the information that connects at all PDN that same APN sets up by aaa server; Also can set up, remove the information of the PDN connection of HSS storage at same APN.

In order in the non-3GPP connecting system of trusted, can unique differentiation to connect at the different PDN that same APN sets up, the record that the non-3GPP connecting system of trusted can connect each PDN that sets up at same APN is made amendment, connect as first PDN that sets up at APN, record can be expressed as (APN, the P-GW sign), second PDN that sets up at same APN connects, record can be expressed as (APN:1, the P-GW sign), come other PDN connections of setting up at same APN are distinguished by APN:1.

Therefore, when if UE has set up two PDN connections by the 3GPP connecting system at same APN, the information that P-GW connects to the non-3GPP connecting system of trusted or a plurality of PDN that set up at same APN that directly provide to the non-3GPP connecting system of trusted by aaa server, can be (APN, the P-GW sign), (APN:1, the P-GW sign), at this moment, because the non-3GPP connecting system of trusted has been set up at record (APN, the P-GW sign) PDN connects, another PDN connection that only need set up again at record (APN:1, P-GW sign) gets final product; Also can be (APN:1, P-GW sign), at this moment, another PDN that the non-3GPP connecting system of trusted is set up at record (APN:1, P-GW sign) connects.

Fig. 8 is for realizing rebuilding the system configuration schematic diagram that PDN connects among the present invention, as shown in Figure 8, this system comprises: the non-3GPP connecting system of P-GW and trusted, when interdepartmental system takes place and switches in UE, wherein, P-GW comprises that information provides the unit, when being used for determining that this UE has set up a plurality of PDN and connects at same APN by the 3GPP connecting system, and the information that provides the PDN that sets up at corresponding A PN to connect to the non-3GPP connecting system of trusted; It is that a plurality of PDN that UE rebuilds at corresponding A PN connect that the non-3GPP connecting system of trusted is used for according to the described information that P-GW provides.The information that the PDN that sets up at same APN that the information of P-GW provides the unit to provide connects can be the information that connects at all PDN that same APN sets up; Also can set up, remove the information of the PDN connection of HSS storage at same APN.

The information that the PDN that the information of P-GW provides the unit directly UE to be set up at same APN connects offers the non-3GPP connecting system of trusted.This system also may further include aaa server, and the information that connects to the PDN that the UE that the non-3GPP connecting system of trusted is transmitted the information of P-GW and provided the unit to provide sets up at same APN is provided.

This system comprises: HSS is used for the record that connects to the PDN that the non-3GPP connecting system of trusted provides the APN of storage to set up.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1. rebuild the method that packet data network PDN connects for one kind, it is characterized in that, when user equipment (UE) interdepartmental system takes place switched, this method comprised:

When grouped data network gateway P-GW determines that described UE has set up a plurality of PDN and connects at same APN APN by third generation partner program 3GPP connecting system, the information that provides the PDN that sets up at described APN to connect to the non-3GPP connecting system of trusted;

The described information that the non-3GPP connecting system of trusted provides according to P-GW is that a plurality of PDN that UE rebuilds at described APN connect.

2. method according to claim 1, it is characterized in that, described P-GW provides before the information of the PDN connection of setting up at APN to the non-3GPP connecting system of trusted, further comprise: the non-3GPP connecting system of trusted provides wireless access technology RAT type to P-GW, P-GW judges that according to described RAT type the non-3GPP connecting system of the described trusted many PDN whether network enabled is initiated connect foundation, if support, then provide the information of the PDN connection of setting up at APN to the non-3GPP connecting system of trusted; Otherwise, the information that does not provide the PDN that sets up at APN to connect to the non-3GPP connecting system of trusted.

3. method according to claim 1, it is characterized in that, when the process that reconstruction PDN connects is initiated by UE, the information that the non-3GPP connecting system of described trusted provides according to P-GW is that UE rebuilds before PDN at APN connects, further comprise: the information that the non-3GPP connecting system of trusted provides according to P-GW, and current information at the PDN connection of described APN of having rebuild for UE, when definite UE of permission rebuilds at the PDN connection of described APN, be that UE rebuilds the PDN connection at described APN.

4. method according to claim 3 is characterized in that,

The described APN that carries in the message that the non-3GPP connecting system of trusted sends in layer 3 attaching process according to UE determines to rebuild the process that PDN connects and is initiated by UE; And/or,

The switching designator that the non-3GPP connecting system of trusted carries in request message according to UE determines that current needs are that UE rebuilds the PDN connection.

5. according to the arbitrary described method of claim 1 to 4, it is characterized in that described P-GW comprises to the information that the non-3GPP connecting system of trusted provides the PDN that sets up at described APN to connect:

P-GW directly provides the information of the PDN connection of setting up at described APN to the non-3GPP connecting system of trusted; Perhaps,

P-GW provides the information of the PDN connection of setting up at described APN to the non-3GPP connecting system of trusted by aaa server.

6. method according to claim 5 is characterized in that, described P-GW, comprising to the information that the non-3GPP connecting system of trusted provides the PDN that sets up at described APN to connect by aaa server:

P-GW provides the information of the PDN connection of setting up at described APN to aaa server;

The information that the PDN that sets up at described APN that aaa server is received to the non-3GPP connecting system forwarding of trusted connects.

7. method according to claim 5 is characterized in that, the information that the described PDN that sets up at described APN connects is: the information that all PDN that set up at described APN connect; Perhaps, the information that the PDN that sets up at described APN, remove the HSS storage connects.

8. method according to claim 1 is characterized in that, described P-GW determines that it is to realize by the record of self storing that UE has set up a plurality of PDN connections by the 3GPP connecting system at same APN.

9. rebuild the system that PDN connects for one kind, it is characterized in that, when UE interdepartmental system takes place switched, this system comprised: the non-3GPP connecting system of P-GW and trusted, wherein,

Described P-GW comprises that information provides the unit, when being used for determining that this UE has set up a plurality of PDN and connects at same APN by the 3GPP connecting system, and the information that provides the PDN that sets up at described APN to connect to the non-3GPP connecting system of trusted;

It is that a plurality of PDN that UE rebuilds at described APN connect that the non-3GPP connecting system of described trusted is used for according to the described information that P-GW provides.

10. system according to claim 9 is characterized in that, described system further comprises: the information that connects to the PDN that the UE that the non-3GPP connecting system of trusted is transmitted the information of P-GW and provided the unit to provide sets up at same APN is provided aaa server.

11. according to claim 9 or 10 described systems, it is characterized in that, described P-GW further comprises judging unit, be used for judging that according to the RAT type that the non-3GPP connecting system of trusted provides the non-3GPP connecting system of the described trusted many PDN whether network enabled is initiated connect foundation, if support, then provide the information of the PDN connection of setting up at APN to the non-3GPP connecting system of trusted; Otherwise, the information that does not provide the PDN that sets up at APN to connect to the non-3GPP connecting system of trusted.

12. according to claim 9 or 10 described systems, it is characterized in that, when the process that reconstruction PDN connects is initiated by UE, the information that the non-3GPP connecting system of described trusted is further used for providing according to P-GW, and the information that connects of the current PDN at described APN that has rebuild for UE determine whether to allow UE to rebuild PDN connection at described APN.

13. according to claim 9 or 10 described systems, it is characterized in that described system further comprises HSS, be used for the record that connects to the PDN that the non-3GPP connecting system of trusted provides the APN of storage to set up.