CN102761935A

CN102761935A - Method, system and UE for selecting ePDG/PDNGW

Info

Publication number: CN102761935A
Application number: CN2011101049647A
Authority: CN
Inventors: 周星月; 朱春晖
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2011-04-26
Filing date: 2011-04-26
Publication date: 2012-10-31
Also published as: WO2012146096A1

Abstract

The invention discloses a method for selecting evolved Packet Data Gateway (ePDG)/ Packet Data Network Gateway (PDNGW). The method comprises the steps as follows: UE (Unified Equipment) acquires the location information of a current access network and initiates an ePDG/PDNGW query to EPS according to the acquired location information of the current access network; next, the ePDG/PDNGW is selected according to a query result returned from the EPS, or after the EPS receives the location information reported from the current access network of the UE, the ePDG/PDNGW information corresponding to the location information of the access network is judged to exist in local configuration, and then the ePDG/PDNGW information is directly sent to the UE for selection. The invention discloses the UE and a system for selecting ePDG/PDNGW. According to the invention, the ePDG/PDNGW is selected by referring to the location information of the access network, thereby avoiding the routing detour and improving the selection accuracy of the ePDG/PDNGW.

Description

Method, system and the UE of a kind of selection ePDG/PDN GW

Technical field

The present invention relates to communication technical field, relate in particular to a kind of packet data gateway of selecting evolution (Evolved Packet Data Gateway, ePDG)/method, system and the UE of packet data gateway (Packet Data Network Gateway, PDN GW).

Background technology

Third generation partner program (3rd Generation Partnership Project; 3GPP) the grouping system of evolution (Evolved Packet System; EPS) by UMTS land radio access web (the Evolved Universal Terrestrial Radio Access Network of evolution; E-UTRAN), mobile management unit (Mobility Management Entity; MME), gateway (Serving Gateway, S-GW), grouped data network gateway (Packet Data Network Gateway, PDN GW), home subscriber server (Home Subscriber Server; HSS), "Policy and Charging Rules Function (Policy and Charging Rules Function, PCRF) form by entity and other support nodes.

Fig. 1 is EPS system and non-3GPP procotol (Internet Protocol; IP) the intercommunication configuration diagram of Access Network; As shown in Figure 1, the intercommunication of EPS system and non-3GPP IP Access Network realizes that through the S2a/S2b/S2c interface anchor point between 3GPP and non-3 GPP system is PDN GW.Non-3GPP IP inserts and is divided into the non-3GPP IP access of trusted and trustless non-3GPP IP access, and the non-3GPPIP of trusted inserts and can directly be connected with PDN GW through the S2a interface; Trustless non-3GPP IP inserts to be needed to link to each other with PDN GW through ePDG; Interface between ePDG and PDN GW is S2b; S2c provides subscriber equipment (User Equipment; UE) with P-GW between relevant control and the mobility support of user plane, the mobility management protocol of its support for the mobile IP v 6 of supporting two stacks (Mobile IPv6 Support for Dual Stack Hosts and Routers, DSMIPv6).

Among Fig. 1, MME is responsible for the related work of chains of command such as processing and 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, between E-UTRAN and PDN GW, transmits data, and is responsible for pending datas such as paging are carried out buffer memory; PDN GW then is that (Packet Data Network, borde gateway PDN) are responsible for the access of PDN and between EPS and PDN, are transmitted function such as data for EPS and packet data network; PCRF is the "Policy and Charging Rules Function entity, and it links to each other with the IP operation network through receiving interface Rx, obtains business information; In addition; It links to each other with gateway device in the network through the Gx/Gxa/Gxc interface, is responsible for initiating the foundation that IP carries, service quality (the Quality of Service of assurance business datum; And the control of chargeing QoS).

UE is being connected to EPS suitable ePDG of selection earlier through mistrustful Access Network, in the prior art, UE is generally through name server (Domain Name Server; DNS) mode is inquired about the ePDG address; Concrete, UE adopts current public sphere mobile network sign (Public Land Mobile Network Identity, PLMN ID) to constitute a full name domain name (Fully Qualified Domain Name; FQDN) as the query requests content of DNS; Thereby obtain the ePDG address in the corresponding PLMN scope, same, UE also adopts similar system of selection when selecting PDN GW.Because the selection precision of existing ePDG/PDN GW only guarantees in a PLMN scope; So, may bring problems such as route is circuitous, such as; The ePDG that is positioned at the UE selection in Jiangsu Province is positioned at Beijing; And PDN GW is in Shanghai, and like this, the data that are positioned at the UE in Jiangsu will mail to the ePDG of Pekinese earlier to be transmitted to the PDN GW in Shanghai again.

Summary of the invention

In view of this, main purpose of the present invention is to provide method, system and the UE of a kind of ePDG/PDN of selection GW, can avoid route to make a circulation, improve ePDG/PDN GW and select precision.

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

A kind of method of selecting packet data gateway (the ePDG)/packet data gateway (PDN GW) of evolution comprises:

Subscriber equipment (UE) obtains the positional information of current Access Network;

Said UE initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to the grouping system (EPS) of evolution;

Said UE selects ePDG/PDN GW according to the Query Result that EPS returns.

The positional information that said UE obtains current Access Network is:

UE is to the positional information of authentication and authorization charging server (3GPP AAA) the current Access Network of server requests;

Said 3GPP aaa server sends to said UE through the route certificate authority information that issues with the positional information of the current Access Network of said UE.

Said UE initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS:

Said UE basis makes up full name domain name (FQDN) from the positional information of the current Access Network of said 3GPP aaa server; Perhaps; Make up FQDN in conjunction with public sphere mobile network sign (PLMN ID) or APN (APN); And to name server (DNS) transmission query messages, said query messages carries said FQDN.

The positional information of the Access Network that said 3GPP aaa server issues for before the positional information that reports of said Access Network, perhaps, for to before the positional information of the positional information that reports of said Access Network after handling.

The positional information of said Access Network comprises geographical location information and/or administrative geography position.

A kind of method of selecting ePDG/PDN GW comprises:

EPS receives the positional information that the current Access Network of UE reports;

Said EPS judges that this locality disposes the ePDG/PDN GW information corresponding with said Access Network positional information, then directly sends to said UE with said ePDG/PDN GW information;

The ePDG/PDN GW Information Selection ePDG/PDN GW that said UE sends according to EPS.

Said EPS judges the local ePDG/PDN GW information corresponding with said Access Network positional information that disposes; Then directly said ePDG/PDN GW information being sent to said UE is: the 3GPP aaa server is judged the local ePDG/PDN GW information corresponding with said Access Network positional information that disposes; Then directly said ePDG/PDN GW information is sent to said UE, said ePDG/PDN GW information is IP address or the FQDN of ePDG/PDN GW.

A kind of UE is used for when selecting ePDG/PDN GW, obtaining the positional information of current Access Network, and initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS, and the Query Result that returns according to EPS is afterwards selected ePDG/PDN GW.

Said UE makes up FQDN according to the positional information of current Access Network, perhaps, according to the positional information of current Access Network, makes up FQDN in conjunction with PLMN ID or APN, and sends query messages to DNS, and said query messages carries FQDN.

A kind of system of selecting ePDG/PDN GW, this system comprises UE and EPS; Wherein,

Said EPS; Be used for after receiving the positional information that the current Access Network of UE reports; Judge the local ePDG/PDN GW information corresponding that whether disposes with said Access Network positional information; Judge that this locality disposes the ePDG/PDN GW information corresponding with said Access Network positional information, then directly said ePDG/PDNGW information is sent to said UE, said ePDG/PDN GW information is IP address or the FQDN of ePDG/PDN GW;

Said UE is used for the ePDG/PDN GW Information Selection ePDG/PDN GW that sends according to EPS.

The present invention selects method, system and the UE of ePDG/PDN GW, and UE obtains the positional information of current Access Network, initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS; The Query Result that returns according to EPS is afterwards selected ePDG/PDN GW; Perhaps; After EPS receives the positional information that the current Access Network of UE reports; Judge that this locality disposes the ePDG/PDN GW information corresponding with said Access Network positional information, then directly said ePDG/PDN GW information is sent to said UE, supply UE to select.The present invention combines the positional information of Access Network to select ePDG/PDN GW, selects precision so can avoid route to make a circulation, improve ePDG/PDN GW.

Description of drawings

Fig. 1 is the intercommunication configuration diagram of EPS system and non-3GPP IP Access Network;

Fig. 2 is a kind of method flow sketch map of selecting ePDG/PDN GW of the present invention;

Fig. 3 is the another kind of method flow sketch map of selecting ePDG/PDN GW of the present invention;

Fig. 4 is the schematic flow sheet that UE selects ePDG in the embodiment of the invention 1;

Fig. 5 is the schematic flow sheet that UE selects ePDG in the embodiment of the invention 2;

Fig. 6 is the schematic flow sheet that UE selects ePDG and/or PDN GW in the embodiment of the invention 3.

Embodiment

Basic thought of the present invention is: UE obtains the positional information of current Access Network, initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS; The Query Result that returns according to EPS is afterwards selected ePDG/PDN GW; Perhaps; After EPS receives the positional information that the current Access Network of UE reports; Judge that this locality disposes the ePDG/PDN GW information corresponding with said Access Network positional information, then directly said ePDG/PDN GW information is sent to said UE, supply UE to select.

The present invention mainly describes when UE is connected to EPS through the S2c interface based on DSMIPv6, selects the situation of ePDG/PDN GW, and the ePDG that is specifically related under the S2b/S2c scene selects, and the PDN GW under the S2c scene selects.

Fig. 2 is a kind of method flow sketch map of selecting ePDG/PDN GW of the present invention, and is as shown in Figure 2, and this method comprises:

Step 201:UE obtains the positional information of current Access Network.

When UE connects EPS through Access Network (such as WLAN, WiMAX or CDMA2000 etc.); Access Network can be carried out in the process of access authentication at authentication and authorization charging server (Authentication Authorization Accounting Server, AAA Server, 3GPP aaa server); Positional information to 3GPP aaa server announcement self; The positional information of Access Network can comprise geographical location information and/or administrative geography position, and for example, the positional information of Access Network can comprise with the next item down or multinomial: geographical position longitude and latitude, street, area code, postcode; Need to prove; In access authentication procedure, the 3GPPAAA server possibly carry out not describing in detail at this alternately with HSS.

Preferably, UE is specifically to the positional information of the current Access Network of 3GPP aaa server request, and the 3GPPAAA server sends to said UE through the route certificate authority information that issues with the positional information of the current Access Network of said UE.Need to prove; The positional information of the Access Network that the 3GPP aaa server issues can be before the positional information that reports of said Access Network; Also can be to before the positional information of the positional information that reports of said Access Network after handling; Such as, having reported street and area code before the Access Network, the positional information that request issues according to UE includes only the corresponding area code of said Access Network.

Step 202:UE initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS.

Preferably, the UE basis makes up FQDN from the positional information of the current Access Network of 3GPP aaa server, and sends query messages to DNS, and said query messages carries said FQDN.Here, DNS is the DNS that is used for the network element inquiry of 3GPP system that operator disposes, and belongs to the 3GPP network element.

Need to prove that UE can also be on the basis of the positional information of obtaining current Access Network, further combine as PLMN ID or APN (Access Point Name APN) waits other information architectures FQDN, and carries out DNS and inquire about.

Step 203:UE selects ePDG/PDN GW according to the Query Result that EPS returns.

Here, the Query Result that EPS returns possibly comprise a plurality of positions and the nearer ePDG/PDN GW of the current Access Network of UE, and UE can select one of them ePDG/PDN GW at random or according to actual conditions.

Fig. 3 is the another kind of method flow sketch map of selecting ePDG/PDN GW of the present invention, and as shown in Figure 3, this method comprises:

When step 301:UE connected EPS through Access Network, EPS received the positional information that the current Access Network of said UE reports.

Step 302:EPS judges that this locality disposes the ePDG/PDNGW information corresponding with said Access Network positional information, then directly sends to said UE with said ePDG/PDN GW information.

Preferably; The 3GPP aaa server is after receiving the positional information that Access Network reports; If this locality disposes the ePDG/PDN GW information corresponding with said Access Network positional information, then directly said ePDG/PDN GW information is sent to UE through the route certificate authority information that issues.

Here, ePDG information can be the IP address of ePDG or FQDN etc., and PDN GW information can be the IP address of PDN GW or FQDN etc.

The ePDG/PDN GW Information Selection ePDG/PDN GW that step 303:UE sends according to EPS.

Here, the ePDG/PDN GW information that EPS sends possibly comprise a plurality of positions and the nearer ePDG/PDN GW of the current Access Network of UE, and UE can select one of them ePDG/PDN GW at random or according to actual conditions.

A kind of UE of the also corresponding proposition of the present invention; This UE is used for when selecting ePDG/PDN GW; Obtain the positional information of current Access Network, and initiate ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS, the Query Result that returns according to EPS is afterwards selected ePDG/PDN GW.

A kind of system of selecting ePDG/PDN GW of the also corresponding formulation of the present invention, this system comprises UE and EPS; Wherein,

Below in conjunction with specific embodiment technical scheme of the present invention is done further to introduce in detail.

Embodiment 1

In the present embodiment, UE is connected to EPS through non-3 GPP access network and obtains positional information, carries out ePDG through DNS again and selects.

Fig. 4 is the schematic flow sheet that UE selects ePDG in the embodiment of the invention 1, and as shown in Figure 4, this flow process comprises:

Step 401:UE is established to the wireless connections of non-3 GPP access network;

Step 402: non-3 GPP access network is set up the wireless connections with UE, and non-3 GPP access network sends EAP request (EAP Request/Identity) message to UE, and request UE provides identity information to network, is used for access authentication;

After step 403:UE receives the EAP request message, reply message through EAP the UE identity information is sent to non-3 GPP access network;

Step 404: non-3 GPP access network sends the AAA request message (Diameter message) carry the UE identity information to the 3GPP aaa server, also carries the positional information (can comprise but be not limited to geographical location information, administrative geography positional information etc.) of non-3 GPP access network in the said AAA request message;

Mutual EAP-AKA ' the algorithm of step 405:3GPP aaa server and HSS authentication information carries out the authentication of user's algorithm;

Step 406:3GPP aaa server extracts key information;

Step 407:3GPP aaa server sends AAA/AKA ' challenge message to non-3 GPP access network, carries out negotiating algorithm, carries the EAP request and the AKA ' challenge information that comprise message authentication code in the AAA/AKA ' challenge message;

Step 408: non-3 GPP access network sends the EAP request/AKA ' challenge message that comprises message authentication code to UE;

Operation AKA algorithm generated key related information after step 409:UE received EAP request/AKA ' challenge message;

Step 410:UE is encapsulated into AKA result of calculation and location information request among the EAP, sends EAP response/AKA ' challenge message to non-3 GPP access network;

Step 411: the EAP response message that comprises negotiating algorithm information and location information request that non-3 GPP access network will be received is encapsulated in the Diameter message and is transmitted to aaa server;

The message authentication code information that the inspection of step 412:3GPP aaa server is received is carried out the algorithm information checking to it, carries out processing such as position request information inspection;

Step 413:3GPP aaa server is encapsulated into positional information in the Diameter message that comprises EAP-Success message and sends to non-3 GPP access network;

Step 414: non-3 GPP access network is given UE with EAP Success forwards;

Step 415:UE makes up FQDN according to positional information, and initiates inquiry acquisition ePDG address nearby to DNS.If UE inserts through the S2c interface based on DSMIPv6, UE also can combine APN to make up FQDN obtains address from PDN GW nearby to DNS initiation inquiry according to this positional information.

Embodiment 2

In the present embodiment; UE is connected to EPS through the WLAN Access Network and obtains ePDG information; BAS Broadband Access Server in the WLAN Access Network (Broadband Remote Access Server; BRAS)/(Broadband Network Gateway is BNG) as the authentication network element of non-3 GPP access network for wideband network gateway.

Fig. 5 is the schematic flow sheet that UE selects ePDG in the embodiment of the invention 2; WiFi access point (the Wireless Fidelity Access Point that has shown wlan system among the figure; AP), AC (Access Controller), home gateway (Residential Gateway; RG) and capital equipment network element such as BRAS/BNG, as shown in Figure 5, this flow process comprises:

Step 501:UE is established to the wireless connections of WLAN Access Network, sets up three layers of connection, and BRAS/BNG is UE distributing IP address;

Step 502:WLAN Access Network is set up the wireless connections with UE, and BRAS/BNG sends EAP request (EAP Request/Identity) message to UE, and request UE provides identity information to network, is used for access authentication;

After step 503:UE receives the EAP request message, reply message through EAP the UE identity information is sent to BRAS/BNG;

Step 504:BRAS/BNG sends the AAA request message (Diameter message) carry the UE identity information to the 3GPPAAA server, also carries the positional information (comprise but be not limited to geographical location information, administrative geography positional information etc.) of BRAS/BNG in the said AAA request message;

Mutual EAP-AKA ' the algorithm of step 505:3GPP aaa server and HSS authentication information carries out the authentication of user's algorithm;

Step 506:3GPP aaa server extracts key information;

Step 507:3GPP aaa server sends AAA/AKA ' challenge message to BRAS/BNG, carries out negotiating algorithm, carries the EAP request and the AKA ' challenge information that comprise message authentication code in the AAA/AKA ' challenge message;

Step 508:BRAS/BNG sends the EAP request/AKA ' challenge message that comprises message authentication code to UE;

Operation AKA algorithm generated key related information after step 509:UE received EAP request/AKA ' challenge message;

Step 510:UE is encapsulated among the EAP AKA result of calculation and location information request to non-3 GPP access network transmission EAP response/AKA ' challenge message;

The EAP response message that comprises negotiating algorithm information and location information request that step 511:BRAS/BNG will receive is encapsulated in the Diameter message and is transmitted to aaa server;

The message authentication code information that the inspection of step 512:3GPP aaa server is received is carried out the algorithm information checking to it, carries out processing such as position request information inspection;

Step 513:3GPP aaa server is encapsulated into positional information in the Diameter message that comprises EAP-Success message and sends to BRAS/BNG;

Step 514:BRAS/BNG gives UE with EAP Success forwards;

Step 515:UE makes up FQDN according to positional information and initiates inquiry acquisition ePDG address nearby to DNS.If UE inserts through the S2c interface based on DSMIPv6, UE also can combine APN to make up FQDN obtains address from PDN GW nearby to DNS initiation inquiry according to this positional information.

Embodiment 3

In the present embodiment, 3GPP AAA Server directly will be handed down to UE according to ePDG and/or the PDN GW information (IP address or FQDN) that positional information is selected.Fig. 6 is the schematic flow sheet that UE selects ePDG and/or PDN GW in the embodiment of the invention 3, and as shown in Figure 6, this flow process comprises:

Step 601:UE is established to the wireless connections of WLAN Access Network, sets up three layers of connection, and BRAS/BNG is UE distributing IP address;

Step 602:WLAN Access Network is set up the wireless connections with UE, and BRAS/BNG sends EAP request (EAP Request/Identity) message to UE, and request UE provides identity information to network, is used for access authentication;

After step 603:UE receives the EAP request message, reply message through EAP the UE identity information is sent to BRAS/BNG;

Step 604:BRAS/BNG sends the AAA request message (Diameter message) carry the UE identity information to the 3GPPAAA server, also carries the positional information (comprise but be not limited to geographical location information, administrative geography positional information etc.) of BRAS/BNG in the said AAA request message;

Mutual EAP-AKA ' the algorithm of step 605:3GPP aaa server and HSS authentication information carries out the authentication of user's algorithm;

Step 606:3GPP aaa server extracts key information;

Step 607:3GPP aaa server sends AAA/AKA ' challenge message to BRAS/BNG, carries out negotiating algorithm, carries the EAP request and the AKA ' challenge information that comprise message authentication code in the AAA/AKA ' challenge message;

Step 608:BRAS/BNG sends the EAP request/AKA ' challenge message that comprises message authentication code to UE;

Operation AKA algorithm generated key related information after step 609:UE received EAP request/AKA ' challenge message;

Step 610:UE is encapsulated into AKA result of calculation and ePDG and/or PDN GW request among the EAP and sends EAP response/AKA ' challenge message to non-3 GPP access network;

The EAP response message that comprises negotiating algorithm information and ePDG and/or PDN GW request that step 611:BRAS/BNG will receive is encapsulated in the Diameter message and is transmitted to aaa server;

The message authentication code information that step 612:3GPP aaa server inspection is received is carried out the algorithm information checking to it, carries out selecting according to positional information processing such as corresponding ePDG and/or the inspection of PDN GW solicited message;

Step 613:3GPPAAA server is encapsulated into ePDG and/or PDN GW (IP address or FQDN) in the Diameter message that comprises EAP-Success message and sends to BRAS/BNG.

Step 614:BRAS/BNG gives UE with EAP Success forwards.

Step 615: if UE receives is the FQDN information of FQDN and/or the PDN GW of ePDG, UE initiates inquiry according to FQDN to DNS and obtains nearby ePDG address and/or PDN GW address so.

Can find out; Limitation to existing ePDG/PDN GW selection; The invention provides the optimization method of a kind of ePDG of selection and/or PDN GW, select ePDG/PDN GW nearby, select precision thereby can avoid route to make a circulation, improve ePDG/PDN GW according to the positional information of Access Network.

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

Claims

1. method of selecting packet data gateway (the ePDG)/packet data gateway (PDN GW) of evolution is characterized in that this method comprises:

Said UE selects ePDG/PDN GW according to the Query Result that EPS returns.

2. method according to claim 1 is characterized in that, the positional information that said UE obtains current Access Network is:

3. method according to claim 2 is characterized in that, said UE initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS and is:

4. according to claim 2 or 3 described methods; It is characterized in that; The positional information of the Access Network that said 3GPP aaa server issues for before the positional information that reports of said Access Network, perhaps, for to before the positional information of the positional information that reports of said Access Network after handling.

5. according to each described method of claim 1 to 3, it is characterized in that the positional information of said Access Network comprises geographical location information and/or administrative geography position.

6. a method of selecting ePDG/PDN GW is characterized in that, this method comprises:

7. method according to claim 6; It is characterized in that; Said EPS judges the local ePDG/PDN GW information corresponding with said Access Network positional information that disposes; Then directly said ePDG/PDNGW information being sent to said UE is: the 3GPP aaa server is judged the local ePDG/PDN GW information corresponding with said Access Network positional information that disposes; Then directly said ePDG/PDN GW information is sent to said UE, said ePDG/PDN GW information is IP address or the FQDN of ePDG/PDN GW.

8. UE; It is characterized in that this UE is used for when selecting ePDG/PDN GW, obtaining the positional information of current Access Network; And initiate ePDG/PDN GW according to the positional information of the current Access Network that obtains to EPS and inquire about, the Query Result that returns according to EPS is afterwards selected ePDG/PDN GW.

9. UE according to claim 8 is characterized in that, said UE initiates ePDG/PDN GW inquiry according to the positional information of the current Access Network that obtains to EPS and is:

10. a system of selecting ePDG/PDN GW is characterized in that, this system comprises UE and EPS; Wherein,