CN1315302C - Method for querying routing in the case of intercommunication between wireless local area network and mobile network - Google Patents

Abstract

The present invention discloses a method of routing inquiry under the condition of the intercommunication of a wireless local area network and a mobile network, which comprises the following steps: an IP address and a user identifier of user equipment are saved in a grouping data gateway; a mapping relationship between the IP address and the user identifier is established; the grouping data gateway searches the IP address and the corresponding user identifier in the grouping data gateway according to the IP address of target user equipment of the received data; a routing inquiry request which comprises the user identifier is sent to routing registering equipment; the routing registering equipment searches the current target user equipment which belongs to the routing information of the authentication server according to the mapping relationship between the user identifier of the contract-signing user equipment and routing information of a user authentication server, wherein the mapping relationship is established in the routing registering equipment; a result is searched to return. The present invention realizes the routing inquiry of the authentication server which belongs to the UE in a WLAN-3GPP intercommunication network by the proposal.

Description

Method for querying routing in the case of intercommunication between wireless local area network and mobile network

technical field

The invention relates to a route query technology in wireless communication, in particular to a method for querying routes under the condition of intercommunication between a wireless local area network and a third generation partnership project (WLAN-3GPP) network.

Background technique

With the rise and development of WLAN technology, WLAN and wireless mobile communication networks, including Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Synchronous Code Division Multiple Access (TD -SCDMA) and the convergence of networks such as CDMA 2000 are becoming the focus of current research. Among them, GSM, CDMA, WCDMA, and TD-SCDMA have been included in 3GPP, and CDMA 2000 belongs to 3GPP2.

3GPP TS23.234 stipulates for WLAN-3GPP interworking scenario 3: After the UE passes the service authorization of the 3GPP home network, the tunnel establishment process is performed between the UE and the PDG. At this time, the subscription information and tunnel information of the UE are stored in the PDG. and other related information, this procedure is a Mobile Originated (MO) procedure. The non-roaming and roaming conditions of interworking scenario 3 are described as follows:

Referring to FIG. 1 , it is a schematic diagram of a simplified network structure in the case of non-roaming in Scenario 3 of WLAN and 3GPP network interworking. The WLAN access network 102 is directly connected to the external Internet (internet) or intranet (intranet) 104, and the user equipment (UE) 101 is respectively connected to the 3GPP authentication and authorization plan of the 3GPP home network (3GPP Home Network) through the WLAN access network 102 The fee server (AS, 3GPP AAA Server) 103 is connected to the packet data gateway (PDG, Packet Data Gateway) 105, and the PDG 105 is connected to the packet data network (PDN, Packet Data Network) belonging to the external network part through the Wi interface. Normally, when the UE 101 wishes to directly access the Internet/Intranet 104 through the WLAN access network 102, it can apply to the 3GPP home network for the service of the interworking scenario 2. If the UE 101 also wishes to access 3GPP Packet Switching (PS) domain services and accesses the PDN through the WLAN-3GPP network, it can further apply to the 3GPP home network for the services of interworking scenario 3. That is, the UE 101 initiates a service authorization process request for the interworking scenario 3 to the AS 103 of the 3GPP home network, and the AS 103 of the 3GPP home network performs service authentication and authorization on the service request. If successful, the AS 103 sends an access permission message to the user, The AS 103 allocates a corresponding PDG 105 to the UE 101, and a tunnel is established between the UE 101 and the allocated PDG 105. And, Charging Gateway (CGw) 107a/Charging Information Collection System (CCF) 107a/Online Charging System (OCS) 107b records charging information according to the network usage of UE 101. The tunnel established for the non-roaming case is UE-WLAN-PDG. At this time, UE 101 can access 3GPP PS domain services, and UE 101 can communicate with PDNs belonging to external networks through the tunnel with PDG 105. PDNs include all packet data networks other than mobile networks such as Internet and Intranet.

The roaming situation in the WLAN access network and 3GPP interworking scenario 3 is similar to the non-roaming situation, and its simplified network structure is shown in FIG. 2 . In the case of roaming, the WLAN access network 102 is connected to the 3GPP home network through a 3GPP visited network (3GPP Visited Network). WLAN access network 102 is connected with UE 101, 3GPP AAA server proxy (AS Proxy) 201, Internet/Intranet 104 and wireless access gateway (WAG) 202. The UE 101 can apply to the 3GPP home network through the 3GPP access network to access the Internet/Intranet 104 for interworking scenario 2 services. If UE 101 still wants to apply for interworking scene 3 services and access to 3GPP PS domain services, UE 101 needs to initiate a service authorization process to the 3GPP home network through the 3GPP access network, and this process is also between UE 101 and AS 103 of the 3GPP home network After the authorization is successful, the AS 103 assigns the corresponding home PDG 105 to the UE 101, and the UE 101 establishes a tunnel between the WAG 202 in the 3GPP access network and the assigned PDG 105. For the roaming case, the established tunnel is UE-WLAN-WAG-PDG. At this time, UE 101 can access the 3GPP PS domain service of the home network.

In the above two cases, after the tunnel between the UE and the PDG is established, the UE can access the 3GPP PS domain service through the PDG, that is, after the data sent by the UE reaches the PDG through the tunnel, the PDG decapsulates the data, Then send the data to the external network through the Wi interface. However, whether in roaming or non-roaming conditions, when the external network initiates the mobile station termination (MT) process to send data to the UE, if no tunnel is established between the UE and the PDG, the service data sent from the external network arrives at the PDG Finally, the PDG needs to know the authentication server to which the target UE belongs, that is, the address of the AS, so as to establish a tunnel between the UE and the PDG through the AS, and then send service data to the user. However, the method for how the PDG obtains the routing information of the AS to which the target UE belongs has not yet been proposed.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for querying routes in the WLAN-3GPP interworking network, so that the PDG device can conveniently query the routes of the authentication server to which the target UE belongs.

A method for querying routing in the case of wireless local area network mobile network intercommunication, comprising the following steps:

a) Preserving the IP address and the user identification of the user equipment in the packet data gateway, and establishing a mapping relationship between the IP address and the user identification;

B) the data of the external network arrives at the packet data gateway and causes a route query, and the packet data gateway searches for the user identifier corresponding to the IP address in itself according to the IP address of the target user equipment contained in the received data;

c) the packet data gateway sends a routing query request containing the user identifier to the routing storage device;

d) The routing registration device searches for the routing information of the authentication server to which the current target user equipment belongs according to the mapping relationship between the user identifier of the subscriber equipment and the routing information of the authentication server established by itself, and returns the search result.

The user identifier of the user equipment in the method is the International Mobile Subscriber Identity (IMSI) of the user equipment, or the WLAN Temporary Mobile Subscriber Identity (WTMSI).

In this method, the route deposit device is a home subscriber service device, and step a) further includes: establishing a communication connection between the packet data gateway and the route deposit device.

The route storage device described in the method is a home subscriber service device;

Step c) further includes: the packet data gateway sends the routing query request to an authentication server connected to the packet data gateway, and the authentication server forwards the query request to the routing depository device;

Step d) further includes: the routing depository device sends the search result to the authentication server, and the authentication server forwards the search result to the packet data gateway.

The route storage device described in the method is a home subscriber service device and an authentication server connected to the packet data gateway; and further includes:

cd1) The packet data gateway sends a routing query request to the authentication server, and the authentication server searches for the routing information of the authentication server to which the current target user equipment belongs, and if found, returns the routing information containing the authentication server to the packet data gateway The response information of the routing information ends the routing query process; otherwise, the authentication server forwards the routing query request to the home subscriber service device;

cd2) The home subscriber service device searches for the routing information of the authentication server to which the current target user equipment belongs, and if found, returns a response message containing the routing information of the authentication server to the authentication server; otherwise, returns to the authentication server Carry the response information with the error reason;

cd3) The authentication server forwards the received response information to the packet data gateway.

In this method, after the authentication server receives the route information returned from the home subscriber service equipment, it further includes: the authentication server saves the route of the authentication server to which the target user equipment belongs contained in the response message.

In this method, the route registration device is an authentication server connected to the packet data gateway, and step a) further includes: saving the routing information of the authentication server to which all subscriber equipment belong to in the authentication server, and establishing the The mapping relationship between the device user ID and the routing information of the authentication server it belongs to.

In this method, the authentication server is a 3GPP authentication authorization accounting server (AS), and the routing information of the authentication server is the address of the AS.

In the method, the home subscriber service equipment is a home subscriber server (HSS).

In this method, the home subscriber service equipment is a home location register (HLR), and step a) further includes: saving the routing information of the authentication server to which the subscriber equipment belongs in the home location register, and establishing the user identification and the affiliation of the subscriber equipment. The mapping relationship of authentication server routing information.

It can be seen from the above scheme that the method for querying routes in the interworking network of the present invention implements the routing information in the WLAN-3GPP interworking network by configuring the relevant information of the contracted mobile user equipment in the packet data gateway and querying in the routing storage device. The query of the route of the authentication server to which the target UE belongs lays a foundation for sending external network data to the user equipment through the WLAN-3GPP interworking network.

Description of drawings

FIG. 1 is a schematic structural diagram of WLAN and 3GPP network interworking scenario 3 non-roaming situation;

FIG. 2 is a schematic structural diagram of roaming in Scenario 3 of WLAN and 3GPP network interworking;

FIG. 3 is a schematic diagram of the network structure of Embodiment 1 of the present invention;

Fig. 4 is the work flowchart of embodiment one of the present invention;

Fig. 5 is a schematic diagram of the network structure of Embodiments 2 and 3 of the present invention;

Fig. 6 is the work flowchart of the second embodiment of the present invention;

Fig. 7 is the work flowchart of embodiment 3 of the present invention;

FIG. 8 is a schematic diagram of the network structure of Embodiment 4 of the present invention;

Fig. 9 is a work flow chart of Embodiment 4 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

At present, for ordinary mobile users, the information about UE stored in the home subscriber service equipment of the 3GPP network, that is, HLR or HSS, includes: UE's user ID, UE's subscription information, UE's security parameters, etc. After the UE has passed the access authentication of the AS, the HLR/HSS will also store the address of the AS to which the UE belongs. In the 3GPP AS, it will store: UE user ID, HLR/HSS address, UE status information, UE subscription Information, UE authentication, authorization parameters and other information. Wherein, the user identifier may be the user's IMSI or WTMSI.

In view of this situation, the present invention pre-configures parameters such as the IP address of the UE and the user ID in the PDG, and establishes a mapping relationship between the IP address of the UE and the user ID. The data sent by the external network reaches the PDG and triggers a routing query. The PDG finds the user ID of the user according to the IP address of the target user in the data, and then sends a query request containing the user ID to the routing storage device to query the target UE. AS route. The routing depository device may be a home subscriber service device, and the home subscriber service device has stored the user ID of the UE, the address of the AS to which the UE belongs, and the mapping relationship between the user ID of the UE and the address of the AS to which it belongs, so it is very easy to query convenient. In addition, the route registration device may also use an AS adjacent to the PDG. Since the user identity of the UE already exists in the AS, it is necessary to add the address of the AS to which the UE belongs to the AS serving as the route registration device.

The following are four schemes for querying the routing information of the AS to which the current UE belongs according to the 3GPP home network structure of the existing roaming or non-roaming situation of the present invention:

Solution 1: PDG directly queries HLR/HSS for routing: first establish a direct interface between PDG and HLR, or between PDG and HSS, PDG directly sends a routing query message to HLR/HSS, and HLR/HSS returns the routing information of the AS to which the UE belongs .

In this solution, since there is no direct interface connection between the PDG and the home subscriber service equipment in the existing WLAN-3GPP network structure, it is first necessary to add an interface between them to establish a connection. Referring to Fig. 3, different interfaces are added according to the network structure adopted: as shown in Fig. 3a, for a network using HSS 106a as the home subscriber service equipment, a Wc interface is added between PDG 105 and HSS 106a; As shown in Figure 3b, for a network using HLR 106b as the home subscriber service device, a Gc' interface is added between PDG 105 and HLR 106b.

Refer to the message flow of Solution 1 shown in FIG. 4 .

The process of using HSS to realize routing query includes:

In step 401, the PDG sends a request message to the HSS through the Wc interface to query the routing information of the AS to which the UE belongs. The request message includes the address of the HSS, the address of the PDG, and the user identifier of the UE.

Step 402, after the HSS receives the request message, it searches for the routing information of the AS to which the requested UE belongs in itself according to the user ID of the request message, and then returns a response message to the requested PDG. If the HSS finds the requested routing information, then in The response message includes the user ID of the UE and the address of the AS to which the UE belongs; if the HSS cannot find the requested routing information, the returned response message includes the corresponding error reason.

For the case of using HLR to realize routing query, because traditional HLR does not involve AS-related services, there is no AS routing entry in the HLR routing table, and the existing parameters and signaling of General Packet Radio Service (GPRS) do not involve AS part. In order to maximize the use of existing resources, this solution uses the Gc' interface to connect PDG and HLR. This interface still uses the existing parameters and signaling of GPRS. At the same time, HLR will also save AS routing information in the form of MSC/SGSN routing. That is, the route of the AS is stored in the routing location of the MSC or SGSN as the route of a certain MSC or SGSN, so that the PDG can query the routing information of the AS to which the UE belongs through this interface.

Then, during routing lookups:

In step 401, the AS routing query request message sent by the PDG can be sent to the HLR through the Gc' interface using the existing MAP_SEND_ROUTING_INFO_FOR_GPRS request message to query the AS routing information to which the UE belongs. Wherein, the UE is represented by the user identity IMSI or WTMIS.

In step 402, the HLR receives the message, and after the search in itself is completed, the existing MAP_SEND_ROUTING_INFO_FOR_GPRS response message is used to return the query result to the PDG as a response message. If the search is successful, the UE's user identification and the AS to which the UE belongs are included in the message The address of the UE, where the information element (IE) "GSN Address" of the MAP_SEND_ROUTING_INFO_FOR_GPRSresponse message is used to place the address identifying the AS to which the UE belongs. If the HLR cannot query the routing information of the AS to which the UE belongs, it will include a corresponding error reason in the response message.

Solution 2: PDG forwards the request to HLR/HSS to query routes via AS: the difference from solution 1 is that the PDG first sends the route query message to the AS connected to it, and then the AS forwards the route query message to the HLR/HSS, and the route lookup After completion, the HLR/HSS returns a routing query response message to the PDG via the AS.

This solution uses the HLR/HSS address stored in the AS, and the intercommunication messages between the PDG and the HLR/HSS are forwarded through the AS. Therefore, this solution can use the existing network structure without adding interfaces. Referring to Fig. 5, Fig. 5a is a network using HSS 106a as home subscriber service equipment, PDG 105 and HSS 106a are indirectly connected through AS 103; Fig. 5b is a network using HLR 106b as home subscriber service equipment, PDG 105 and HLR 106b is indirectly connected via AS 103.

Refer to the message flow of Solution 2 shown in FIG. 6 .

For the case of using HSS query routing, including:

In step 601, the PDG sends a request message to the AS through the Wm interface for the PDG to query the routing information of the AS to which the target UE belongs. The destination address of the request message is the HSS address, the source address is the PDG address, and also includes the user ID of the UE.

In step 602, the request message is first sent to the AS through the Wm interface. After receiving the request message, the AS performs protocol conversion on the message and forwards it to the HSS through the Wx interface.

In step 603, after receiving the request message, the HSS searches for routing information of the AS to which the requested UE belongs, and returns a response message to the PDG. The source address of the response message is the HSS address, and the destination address is the PDG. If the HSS finds the requested routing information, the response message contains the user ID of the UE and the address of the AS to which the UE belongs; if the HSS does not find the requested routing information, the returned response message contains the corresponding error reason. This step Same as step 402.

In step 604, the response message is first sent to the AS via the Wx interface, and the AS performs protocol conversion on the received response message and returns it to the PDG.

For the case where HLR is used to implement route query, the method of saving AS route in HLR and HLR’s use of query response signaling is the same as solution 1, that is, when AS forwards PDG to HLR through D’ interface or Gr’ interface to query the route of AS to which UE belongs For information messages, use the MAP_SEND_ROUTING_INFO_FOR_GPRS request message as the routing information message for the PDG to query the AS to which the UE belongs, and use the MAP_SEND_ROUTING_INFO_FOR_GPRSresponse message as the routing information response message for the PDG to query the AS to which the UE belongs. Use the IE "GSNAddress" of the MAP_SEND_ROUTING_INFO_FOR_GPRS response message to place the address identifying the AS to which the UE belongs. Other processes are the same as the case of HSS.

Solution 3: PDG queries AS for routing, AS then queries HLR/HSS for routing: PDG directly queries AS for routing information of AS to which UE belongs through Wm interface, AS queries HLR/HSS for routing information of AS to which UE belongs, and then The AS returns the routing information returned from the HLR/HSS to the PDG.

This solution still adopts the existing network structure, and its network structure is the same as that of the second solution, which is still the structure shown in FIG. 5 .

The message flow of this solution is shown in FIG. 7 .

For the case of using HSS query routing:

In step 701, the PDG queries the AS for routing information of the AS to which the UE belongs. The PDG sends a message to the AS through the Wm interface that the PDG queries the routing information of the AS to which the target UE belongs. The destination address in the message is the address of the AS, the source address is the address of the PDG, and includes the user identifier of the UE.

Step 702, after the AS receives the request message, it first searches for the AS route to which the target UE belongs in itself, and if the AS finds the routing information of the requested AS to which the target UE belongs, it returns a corresponding message containing the routing information to the PDG; if the AS does not Find the route of the AS to which the requested target UE belongs, then perform protocol conversion on the message and forward the request message to the HSS through the Wx interface according to the HSS address stored in the AS. In the forwarded message, the destination address is changed to the HSS address, and the source address is changed to the AS address.

Step 703: After receiving the request message, the HSS searches for the requested routing information by itself, and returns a response message to the AS. The destination address of the response information is the AS address, and the source address is the HSS address. If the HSS finds the requested routing information, the response message includes the user ID of the UE and the address of the AS to which the UE belongs. If the query routing process fails, the response message includes the corresponding error reason.

In step 704, the AS receives the response message, performs protocol conversion on it, and returns it to the PDG. The destination address of the response message is changed to the PDG address, and the source address is the AS address. At this time, the AS can also save the AS address of the target UE in the response message. When the PDG queries the AS for the AS address of the target UE next time, the AS can directly return the AS address to the PDG without querying the HSS again.

For the interworking network using HLR, it is the same as the scheme 1 and scheme 2, that is, when the AS forwards the routing information message of the PDG querying the AS to which the UE belongs to the HLR through the D' interface or the Gr' interface, the MAP_SEND_ROUTING_INFO_FOR_GPRS request message is used as the PDG querying the UE For the routing information message of the AS to which the UE belongs, the MAP_SEND_ROUTING_INFO_FOR_GPRSresponse message is used as the routing information response message of the PDG querying the AS to which the UE belongs. Use the IE "GSNAddress" of the MAP_SEND_ROUTING_INFO_FOR_GPRS response message to identify the address of the AS to which the UE belongs. Other processes are the same as the case of HSS.

Solution 4: PDG queries AS for routing: PDG directly sends routing query information to AS through Wm interface, and AS directly returns routing information to PDG.

In this solution, in addition to saving information such as UE user ID and UE subscription information in the AS adjacent to the PDG, at least the AS addresses of all authorized interworking network users should be saved. Its network structure is shown in Figure 8, and PDG 105 is directly connected to AS 103 as a routing storage device. Because this scheme does not involve the HLR/HSS part, it can be connected or not connected with the HLR/HSS, and any structure in Fig. 3 and Fig. 5 can be adopted.

Refer to the message flow of Solution 4 shown in FIG. 9 .

In step 901, the PDG queries the AS for routing information of the AS to which the UE belongs. The PDG sends to the AS the PDG query routing information message of the AS to which the UE belongs. The destination address of the message is the address of the AS, the source address of the message is the address of the PDG, and includes the user identifier of the UE.

Step 902: After receiving the message, the AS searches for the AS routing information of the requested target UE in itself according to the user ID of the request message, and then returns a response message to the PDG. If the AS finds the AS routing information of the requested target UE, it responds The message includes the user identifier of the UE and the address of the AS to which the UE belongs. If the query routing process fails, the corresponding error reason is included in the response message.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. A method for querying routing under the situation of wireless local area network mobile network intercommunication, characterized in that, comprising the following steps: a) Preserving the IP address and the user identification of the user equipment in the packet data gateway, and establishing a mapping relationship between the IP address and the user identification; B) the data of the external network arrives at the packet data gateway and causes a route query, and the packet data gateway searches for the user identifier corresponding to the IP address in itself according to the IP address of the target user equipment contained in the received data; c) the packet data gateway sends a routing query request containing the user identifier to the routing storage device; d) The routing registration device searches for the routing information of the authentication server to which the current target user equipment belongs according to the mapping relationship between the user identifier of the subscriber equipment and the routing information of the authentication server established by itself, and returns the search result. 2. The method according to claim 1, wherein the user identifier of the user equipment is an International Mobile Subscriber Identity (IMSI) of the user equipment, or a WLAN Temporary Mobile Subscriber Identity (WTMSI). 3. The method according to claim 1, wherein the routing depository device is a home subscriber service device, and step a) further comprises: establishing a communication connection between the packet data gateway and the routing depository device. 4. The method according to claim 1, characterized in that the routing depository device is a home subscriber service device; Step c) further includes: the packet data gateway sends the routing query request to an authentication server connected to the packet data gateway, and the authentication server forwards the query request to the routing depository device; Step d) further includes: the routing depository device sends the search result to the authentication server, and the authentication server forwards the search result to the packet data gateway. 5. The method according to claim 1, characterized in that the route registration device is a home subscriber service device and an authentication server connected to the packet data gateway; Step c) and step d) further include: cd1) The packet data gateway sends a routing query request to the authentication server, and the authentication server searches for the routing information of the authentication server to which the current target user equipment belongs, and if found, returns the routing information containing the authentication server to the packet data gateway The response information of the routing information ends the routing query process; otherwise, the authentication server forwards the routing query request to the home subscriber service device; cd2) The home subscriber service device searches for the routing information of the authentication server to which the current target user equipment belongs, and if found, returns a response message containing the routing information of the authentication server to the authentication server; otherwise, returns to the authentication server Carry the response information with the error reason; cd3) The authentication server forwards the received response information to the packet data gateway. 6. The method according to claim 5, wherein after the authentication server receives the routing information returned from the home subscriber service equipment, it further comprises: the authentication server belongs to the target user equipment included in the response message. The authentication server route is saved. 7. The method according to claim 1, wherein the route registration device is an authentication server connected to the packet data gateway, and step a) further comprises: saving the authentication server to which all subscriber equipments belong to in the authentication server The routing information of the authorization server, and establishes a mapping relationship between the user identifier of each subscriber equipment and the routing information of the authentication server to which it belongs. 8. The method according to claim 1, 4, 5, 6 or 7, wherein the authentication server is a 3GPP authentication authorization accounting server AS, and the routing information of the authentication server is the address of the AS. 9. The method according to claim 3, 4, 5 or 6, characterized in that the home subscriber service equipment is a home subscriber server (HSS). 10. The method according to claim 3, 4, 5 or 6, wherein the home subscriber service equipment is a home location register (HLR), and step a) further comprises: saving the identity of the subscriber equipment in the home location register The routing information of the authorization server, and the mapping relationship between the user identifier of the subscriber equipment and the routing information of the authentication server to which it belongs.

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