WO2009000124A1

WO2009000124A1 - A method for selecting the gateway in the wireless network

Info

Publication number: WO2009000124A1
Application number: PCT/CN2007/003908
Authority: WO
Inventors: Zaifeng Zong; Se Wu; Jinguo Zhu
Original assignee: Zte Corporation
Priority date: 2007-06-22
Filing date: 2007-12-29
Publication date: 2008-12-31
Also published as: CN101330740A

Abstract

A selection method of the gateway in the wireless network is provided. When the UE roams, it accesses the 3GPP EPS from 3GPP IP access network; during the authentication for access, 3GPP AAA proxy in the visited networks decides whether the UE data must be forwarded passing by the visited network, and adds the decision as the second indication to the authentication result that includes the selection information of the PDN GW added by the 3GPP AAA server in the home network, then forwards the authentication result to the non-3GPP IP access network; finally, non-3GPP IP access network selects PDN GW for the UE according to the PDN GW selectioninformation. If the PDN GW is in the home network, non-3GPP IP access network decides whether to pass by the S-GW in the visited network to access the PDN GW in the home network according to the second indication. The scenario 2 and 3 for the intercommunication between the non-3GPP access network and 3GPP network during the roaming can be distinguished by the method. The method can solve the problem of the PDN GW selection when the roaming mobile terminal accesses the 3GPP EPS from the non-3GPP IP access network.

Description

Gateway selection method in wireless grid

The present invention relates to the field of wireless communications, and more particularly to a gateway selection method in a wireless network. Background technique

In the Evolved Packet System (EPS) proposed by the 3rd Generation Partnership Project (3GPP) organization, the packet data network gateway PDN GW (Packet Data Network GateWay) is a connection PDN and a 3GPP packet. The border gateway of the domain. There may be multiple PDN GWs in the 3GPP evolved packet system, which are respectively connected to different PDNs. As shown in Figure 1.

The 3GPP evolved packet system consists of E-UTRAN (Evolved-UMTS Territorial Radio Access Network), MME (Mobility Management Entity), S-GW (Moon Service Gateway, Serving Gateway), PDN GW, HSS (Home Subscriber Server, Home Subscriber Server), 3GPP AAA Server (3GPP Authentication and Authorization Accounting Server) and other nodes. The MME is responsible for control plane related operations such as mobility management, non-access stratum signaling processing, and user mobility management context management; the S-GW is an access gateway device connected to the E-UTRAN, in the E-UTRAN and the PDN. The data is forwarded between the GWs and is responsible for caching the paging wait data. PDN GW is the border gateway of 3GPP evolved packet system (EPS) and PDN network, which is responsible for PDN access and forwarding data between EPS and PDN.

In Figure 1, the 3GPP evolved packet system provides connectivity services to two PDNs, the enterprise private network and the Internet, respectively. PDN GW 1 provides connectivity to the corporate private network; PDN OW 2 provides connectivity to the Internet. When the mobile terminal accesses the network, the PDN GW selection module selects an appropriate PDN GW for the mobile terminal. In the access authentication process of the mobile terminal, the HSS/AAA provides the necessary information for the PDN GW selection module. In the 3GPP evolved packet system, the information provided to HSS/AAA is as follows: The information provided by the HSS/AAA to the PDN GW selection module is either a PDN GW IP address list and an Access Point Name (APN, Access Point Name); or an APN and a selectable visited Land Mobile Network (VPLMN, visited PLM) Instructions for PDN GW.

When the HSS/AAA provides the PDN OW selection module with an indication of the APN and whether the PDN GW of the VPLMN can be selected, if the indication indicates that the PDNMN can select the PDN GW, the PDN GW selection module first attempts to select from the VPLMN according to the APN. PDN GW, if it fails, the PDN GW selection module selects the PDN GW from the home land mobile network (HPLMN) according to the APN.

As shown in Figure 1, when non-roaming, the non-3GPP IP access network is directly connected to the PDN GW through S2a or S2b. When roaming, there are three scenarios for interworking between the non-3GPP IP access network and 3GPP, namely:

Scenario 1: The mobile terminal directly accesses the PDN from the PDN GW of the VPLMN through the non-3GPP IP access network.

Scenario 2: The mobile terminal cannot access from the PDN GW of the VPLMN through the non-3G P IP access network; the PDN, but the non-3GPP operator has a protocol with the HPLMN operator of the mobile terminal, and can directly access the non-3GPP access network. To the PDN GW of HPLMN.

Scenario 3: The mobile terminal cannot access the PDN from the PDN GW of the VPLMN through the non-3GPP IP access network, and the VPLMN does not allow the mobile terminal to directly access the PDN GW of the HPLMN, the roam between the VPLMN and the HPLMN through the non-3GPP access network. The protocol stipulates that the non-3GPP access network must access the HPLMN's PDN GW via the VPLMN's Serving Gateway (S-GW).

The following scenario is described by taking an untrusted non-3GKP IP access network as an example. Non-trust non

The access network element of 3GPP is an enhanced packet data gateway ePDG, and the scene during roaming is shown in FIG. 2 . The number 1 in the figure corresponds to the scenario 1 above, the mobile terminal directly accesses the PDN through the PDN GW located in the VPLMN; the number 2 corresponds to the scenario 2, the mobile terminal accesses the PDN through the PDN GW located in the HPLM; the number 3 corresponds to the scenario 3 above. The mobile terminal accesses the PDN through the S-GW located at the VPLMN and then through the PDN GW located at the HPLMN.

Currently, the PDN GW selection method defined in the 3GPP evolved packet system can only select scene 1 during roaming, and cannot distinguish between scene 2 and scene 3. Summary of the invention

The technical problem to be solved by the present invention is to provide a gateway selection method in a wireless network, which can solve the problem of selecting a PDN GW from a 3GPP evolved packet system EPS during roaming.

The technical solution adopted by the present invention is a gateway selection method in a wireless network, which includes the following steps:

(a) when the mobile terminal UE roams, from the non-3rd Generation Partnership Project (3GPP). IP access network access 3GPP evolved packet system EPS;

(b) In the access authentication process, the roaming 3GPP AAA proxy determines whether the UE data link must be forwarded via the roaming network according to the roaming protocol, and adds the second indication information as the second indication information to the non-3GPP IP access. The network, the authentication result further includes packet data network gateway PDN GW selection information that the home 3GPP AAA server joins;

(c) the non-3GPP IP access network selects a PDN GW for the UE according to the PDN GW selection information, and if the selected PDN GW is located at the home location, the non-3GPP IP access network determines to establish user data according to the second indication information. Whether the link needs to access the PDN GW of the home location through the serving gateway S-GW of the roaming place.

Further, the gateway selection method in the wireless network provided by the present invention may further have the following features:

The PDN GW selection information in the step (b) includes an access point name and first indication information, and the first indication information represents whether the PDN GW of the roaming network is allowed to be selected for the mobile terminal.

Step (c) is further divided into the following steps:

If the first indication information indicates that the PDN GW of the roaming network is allowed to be selected for the mobile terminal, the non-3GPP IP access network attempts to select the PDN GW for the mobile terminal according to the access point name in the roaming 3GPP network;

If the first indication information indicates that the PDN GW of the roaming 3GPP network is not allowed to be selected, or the non-3GPP IP access network attempts to select the PDN GW from the roaming 3GPP network, the non-3GPP IP The access network selects a PDN GW for the mobile station based on the WLAN access point name W-APN;

If the selected PDN GW is located at the home location, and the second indication information indicates that the data of the mobile terminal must be forwarded through the roaming 3GPP network, the non-3GPP IP access network attempts to select the S-GW for the mobile terminal in the roaming 3GPP network.

Further, the gateway selection method in the wireless network provided by the present invention may also have the following features: when the mobile terminal accesses the 3GPP network from the trusted non-3GPP IP access network, the non-3GPP IP access network The gateway device selects the PDN GW of the 3GPP network for the mobile terminal; when the mobile terminal accesses the 3GPP network from the untrusted non-3GPP IP access network, the enhanced packet data gateway ePDG selects the PDN GW of the 3GPP network for the mobile terminal.

Further, the gateway selection method in the wireless network provided by the present invention may also have the following features: The roaming protocol in step (b) is a roaming agreement between the roaming network operator and the home network operator.

Further, the gateway selection method in the wireless network provided by the present invention may also have the following features: The gateway device and the ePDG in the non-3GPP IP access network are moved according to the W-APN and the first indication information and the second indication information. The terminal selects the PDN GW and the S-GW of the 3GPP network.

The gateway selection method in the wireless network of the present invention can distinguish between scenario 2 and scenario 3 in which the non-3GPP IP access network communicates with the 3GPP during roaming, and solves the problem that when the mobile terminal UE roams, the mobile terminal is from the non-3GPP IP access network. The problem of selecting a PDN GW in accessing the 3GPP evolved packet system EPS. BRIEF abstract

1 is a cross-sectional architecture diagram of a 3GPP evolved packet system and a non-3GPP IP access network when non-roaming;

2 is a scenario diagram of interworking between a 3GPP evolved packet system and a non-3GPP IP access network during roaming;

Figure 3 is a flow chart of an embodiment of the present invention;

4 is a flow chart of selecting the PDN GW in step 306 of FIG. Preferred embodiment of the invention

The present invention provides a method for distinguishing between scene 2 and scene 3 based on the selection method of the PDN GW defined in the 3GPP evolved packet system. In the access authentication process, the 3GPP AAA proxy located in the VPLMN decides whether to select scenario 1 or scenario 3 when the PDN GW is located in the HPLMN according to the roaming protocol between the VPLMN and the HPLMN. The 3GPP AAA proxy brings this decision to the non-3GPP IP access network in the authentication result. The non-3GPP IP access network selects the PDN GW based on the APNs and flags obtained from the HSS/3GPP AAA system during the authentication process.

The method of the invention will be further described in detail below with reference to the drawings and specific embodiments.

This embodiment describes a procedure for the 3GPP AAA authentication system to provide the required information of the PDN GW for the non-3GPP IP access network when the mobile terminal UE accesses the 3GPP service through the non-3GPP access network for the first time.

After the 3GPP AAA authentication system successfully authenticates the mobile terminal, the 3GPP AAA authentication system carries the PDN GW selection information to the non-3GPP IP access network in the AAA authentication accept message. Wherein, the 3GPP AAA Server located in the home network sends the selection to the PDN GW selection module.

The WLAN required WLAN access point name (W-APN, WLAN APN), and whether or not the indication of the roaming PDN GW can be selected. When the authentication of the mobile terminal is passed through the 3GPTP network of the roaming place, after receiving the AAA authentication accept message from the 3GPP AAA Server, the roaming 3GPP AAA Proxy determines whether the data link of the mobile terminal is necessary according to the roaming protocol. Forwarded via roaming 3GPP network.

This embodiment is described by taking a trusted non-3GPP IP access network as an example. The steps of the flow chart shown in Figure 3 are as follows:

301. A UE (User Equipment, a mobile terminal) establishes a Layer 2 link with a non-access network according to a non-3GPP IP access network specific technology.

302. The non-3GPP access network performs access authentication on the UE, where the network element includes a UE, a non-3GPP access network, a 3GPP AAA Proxy, a 3GPP AAA server, and an HSS. The 3GPP AAA Server is the authentication executor. The HSS provides the user's authentication vector and subscription information, and the 3GPP AAA Proxy and the non-3GPP access network are responsible for transmitting the required authentication between the UE and the 3GPP AAA Server. Signaling

303. After the UE is successfully authenticated by the 3GPP AAA Server, send an authentication accept message to the 3GPP AAA Proxy according to the subscription information provided by the HSS, and send the user W-APN and the first indication information of whether the user is allowed to access from the roaming PDN GW. The indication in 1) is inserted as an option into the authentication accept message;

304. When the UE's authentication passes through the roaming 3GPP AAA Proxy, the 3GFP AAA Proxy intercepts the 303-step authentication accept message. The 3GPP AAA Proxy determines whether the data link of the UE to the PDN must be forwarded through the roaming network according to the roaming agreement between the roaming network operator and the home network operator, and sets the second indication information according to the decision (indication 2 in the figure) 305, 3GPP AAA Proxy appends the indication 2 to the authentication accept message, and forwards the authentication accept message to the non-3GPP access network;

306. The non-3GPP access network selects the PDN GW according to the W-APN, the indication 1 and the indication 2 in the authentication accept message.

As shown in FIG. 4, the selection process of the above step 306 further includes the following steps:

401. The PDN GW selection module obtains the selection information of the PDN GW, including the W-APN, the indication 1 and the indication 2, and starts the selection process of the PDN GW;

This embodiment is a case where the trusted non-3GFP and the 3GPP are intercommunicated, that is, the UE is registered from the trusted non-3GPP IP access network, and the PDN GW selection module is located in the gateway device in the non-3GPP access network. The PDN GW and the S-GW are selected by the gateway device based on the PDN GW selection information obtained from the 3GPP AAA authentication system.

402, PDN GW selection module first determines the indication 1 , if the indication 1 indicates that the PDN GW can be selected from the roaming place, step 403 is performed, otherwise, step 404 is performed;

403, the PDN GW selection module attempts to resolve the PDN GW from the roaming ground according to the W-APN, if the parsing is successful, step 405 is performed, otherwise, step 404 is performed;

404. The non-3GPP access network attempts to resolve the PDN for the UE from the home network according to the W-APN.

GW, if the parsing is successful, the IP address of the PDN GW is obtained from the home network, step 406 is performed, otherwise, step 410 is performed;

405, the non-3GPP access network initiates a link establishment request to the PDN GW of the roaming network, if requested Successfully establishes a user data link to the PDN GW of the roaming network, otherwise, step 410 or 404 is performed;

406, judgment indication 2, if the indication 2 indicates that the network must be forwarded through the roaming, step 407 is performed, otherwise, step 408 is performed;

407, the non-3GPP access network for the UE to try to select the S-GW in the roaming 3GPP network; if the resolution is successful, go to step 409, otherwise, go to step 410;

408. The non-3GPP access network attempts to establish, for the UE, a user data link to the PDN GW located in the home network. If the request is successful,

409. The non-3GPP access network initiates a user data link request to the S-GW, and brings the IP address and the W-APN information of the selected PDN GW to the S-GW. If the request is successful, the S-GW establishes the slave. The user data link to the PDN GW, and the two links are mapped for subsequent data forwarding, otherwise step 410 is performed;

410. The user data link fails to be established. The UE access fails, and the UE sends an access failure information.

In another embodiment, such as when the UE registers from an untrusted non-3GPP IP access network, the PDN

The GW selection module is located in the ePDG. The PDN GW and the S-GW are selected by the ePDG based on the PDN GW selection information obtained from the 3GPP AAA authentication system. The flow of the above embodiment is equally applicable to this case.

It is a matter of course that the invention may be embodied in various other forms without departing from the spirit and scope of the invention.

Industrial Applicability The gateway selection method in the wireless network of the present invention can distinguish between scenario 2 and scenario 3 in which the non-3GPP IP access network communicates with the 3GPP during roaming, and solves the problem that when the mobile terminal UE roams, the mobile terminal is from the non-3GPP IP. The access network accesses the problem of selecting the PDN GW in the 3GPP evolved packet system EPS.

Claims

Claim

1. A gateway selection method in a wireless network, comprising the following steps:

(a) when the mobile terminal UE roams, accesses the 3GPP evolved packet system EPS from the non-3rd Generation Partnership Project (3GPP) IP access network;

(b) In the access authentication process, the roaming 3GPP AAA proxy determines whether the UE data link must be forwarded through the roaming network according to the roaming protocol, and adds the decision as the second indication information to the authentication result and forwards it to the non-3GPP. The IP access network, the authentication result further includes the packet data network gateway PDN GW selection information that the home 3GPP AAA server joins;

2. The method of selecting according to claim 1, wherein:

The selection information in the step (b) includes an access point name and first indication information, and the first indication information represents whether the PDN GW of the roaming network is allowed to be selected for the mobile terminal.

3. The method of selecting according to claim 2, wherein:

Step (c) is further divided into the following steps:

If the first indication information indicates that the PDN GW of the roaming 3GPP network is not allowed to be selected, or the non-3GPP IP access network attempts to select the PDN GW from the roaming 3GPP network, the non-3GPP IP access network is based on the WLAN access point name W- The APN selects a PDN GW for the mobile terminal's home 3GHP network;

If the selected FDN GW is located at the home location, and the second indication information indicates that the data of the mobile terminal must be forwarded through the roaming 3GPP network, the non-3GPP IP access network attempts to select the S-GW for the mobile terminal in the roaming 3GPP network.

4. The method of selecting according to claim 2, wherein:

When the mobile terminal accesses the 3GPP network from the trusted non-3GPP IP access network, the gateway device in the non-3GPP IP access network selects the PDN GW of the 3GPP network for the mobile terminal; when the mobile terminal is from the untrusted non-3GPP IP When accessing the 3GPP network in the access network, the enhanced packet data gateway ePDG selects the PDN GI of the 3GPP network for the mobile terminal.

5. The method of selecting of claim 1 wherein:

The roaming agreement in step (b) is a roaming agreement between the roaming network operator and the home network operator.

6. The method of selecting according to claim 4, characterized in that:

The gateway device and the ePDG in the non-3GPP IP access network select the FDN GW and the S-GW of the 3GPP network for the mobile terminal according to the W-AP and the first indication information and the second indication information.