WO2012142889A1

WO2012142889A1 - Gateway selection method, implementation device and system

Info

Publication number: WO2012142889A1
Application number: PCT/CN2012/072378
Authority: WO
Inventors: 王静; 朱春晖; 周星月
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-04-20
Filing date: 2012-03-15
Publication date: 2012-10-26
Also published as: CN102752830A; CN102752830B

Abstract

Disclosed are a gateway selection method, implementation device and system, for solving the technical problem that when the mobile network operator shifts down the data plane gateway, gateway selection based on user location cannot be realized and then data shunt in the WLAN networks cannot be realized either. In the present invention, the user terminal constructs an FQDN for the evolved data gateway (ePDG) and/or an FQDN for the packet data gateway (P-GW) according to the identification information in the wireless network broadcast message, so as to trigger the DNS to query the ePDG and/or P-GW close to the wireless side, realizing the data shunt function in the WLAN networks.

Description

Gateway selection method, implementation device and system

The present invention relates to the field of mobile communications, and specifically relates to a method for selecting a user-side gateway in a user service data offload scenario in a WMess Local Area Networks (WLAN) network, and a device and system for implementing the method. Background technique

In order to maintain the competitiveness of the third-generation mobile communication system in the field of communication, to provide users with faster, less delayed, and more personalized mobile communication services, while reducing operators' operating costs, third-generation cooperation The 3rd Generation Partnership Project (3GPP) Standards Working Group is working on the Evolved Packet System (EPS). FIG. 1 shows a schematic structural diagram of an evolved packet domain system. As shown in FIG. 1, the entire EPS system is divided into two parts: a radio access network and a core network. In the core network, it includes a Home Subscriber Server (HSS), a Mobility Management Entity (MME), a Serving GPRS Support Node (SGSN), and a policy charging rule function. And Charging Rule Function (PCRF), Serving Gateway (S-GW), Packet Data Gateway (PDN Gateway, P-GW), and Packet Data Network (PDN). The functions of each part are described in detail below:

The home subscriber server is the permanent storage location of the subscriber's subscription data, and is located in the home network to which the subscriber subscribes.

The mobility management entity is the location where the user subscription data is stored in the current network, responsible for terminal-to-network non-access layer signaling management, terminal security verification function, terminal mobility management, user idle mode tracking and paging. Management functions and bearer management.

Serving GPRS support node, is a global mobile communication system (Global System for Mobile) Communications, GSM) Enhanced Data Rate for GSM Evolution (EDGE) GSM Radio Access Network (GERAN) and Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UMTS Terrestrial Radio Access Network, UTRAN) The service support point for users to access the core network is similar to the mobility management entity. It is responsible for user location update, paging management, and bearer management.

The service gateway is a gateway of the core network to the wireless system, and is responsible for the user plane bearer of the terminal to the core network, the data buffer in the terminal idle mode, the function of initiating the service request by the network side, the lawful interception and the packet data routing and forwarding function; It is responsible for counting the situation in which the user terminal uses the wireless network, and generates the CDR of the terminal using the wireless network, and transmits it to the charging gateway.

The packet data gateway is a gateway of the evolved system and the external packet data network of the system, and is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP) address allocation, the charging function, the packet filtering, and the terminal. Features such as policy control.

The packet data network is the operator's IP service network, which provides IP services to users through the carrier's core network.

The policy charging rule function entity is a server in the evolved system responsible for providing rules for charging control, online credit control, threshold control, and quality of service (QoS) policies.

The radio access network is composed of an evolved base station (Evolved NodeB, eNB) and a 3G radio network controller (RNC). It is mainly responsible for transmitting and receiving wireless signals, and communicating with the terminal through the air interface to manage the wireless of the air interface. Resources, resource scheduling, and access control.

The service GPRS support node is an upgraded SGSN, which can support the S4 interface with the service gateway, and communicates with the mobility management unit by using GPRS Tunneling Protocol version 2 (GTPv2). And for supporting 3G core network For the SGSN, the Packet Switching (PS) domain network architecture is different from that of Figure 1. At this time, the SGSN and the MME are connected by using the Gn interface, and the interworking uses the GPRS Tunneling Protocol version 1 (GTPvl). The SGSN cannot be connected to the serving gateway, and is connected to the Gateway GPRS Support Node (GGSN) through the Gn interface to directly access the packet data network.

The UE can access the P-GW of the EPS through the access network defined by the 3GPP (for example, the evolved universal mobile communication system terrestrial radio access network E-UTRAN), and can also access through the non-3GPP access network. That is to say, the P-GW is a shared gateway for 3GPP access and non-3GPP access, and is an anchor point for the UE to switch between networks. As a typical non-3GPP access network, WLAN access can access the 3GPP network in the following three ways;

The first way is to use an ePDG (Evolved Packet Data Gateway) to transfer to the P-GW as an untrusted non-3GPP access. The interface between the ePDG and the P-GW is called an S2b interface. With the PMIPv6 protocol, the GTP protocol can also be used.

The second way is to use the ePDG as the untrusted non-3GPP access to the P-GW. The interface between the UE and the P-GW is called the S2c interface, and the interface adopts the DSMIPv6 protocol.

The third mode is as a trusted non-3GPP access. The UE directly accesses the P-GW through the WLAN network. The interface between the UE and the P-GW is referred to as an S2c interface, and the interface adopts the DSMHV6 protocol.

The P-GW and the Authentication Authorization Account (AAA) are the S6b interface between the server and the AAA proxy. The interface is used by the P-GW to obtain the context from the AAA Server/AAA Proxy. Operation such as information; The SWM interface between the ePDG and the AAA Server/AAA Proxy is used for user access authentication and other operations.

Users mainly use WLAN to access services such as the Internet. This type of service is expensive for mobile network operators but has low network revenue. In response The increase in data volume is not proportional to the network revenue and try to avoid the expansion of network equipment caused by the increase in data volume. Mobile network operators consider diverting this type of data to the edge of the network and no longer forward data through the core network. The idea of diversion of WLAN networks. In the implementation, the ePDG and the P-GW as the data plane packet gateway of the WLAN access EPC network can be used as the data distribution point to offload the user data of the WLAN network, but the topology structure of the ePDG and the P-GW in the current network deployment architecture Both are relatively high, usually located in the mobile operator's core network, and are not suitable for WLAN offload implementation. After the mobile network operator moves the data plane gateway downward, there is currently no implementation scheme to support the gateway selection based on the user location. For example, the user selects the data plane packet gateway close to the wireless side, and the WLAN offload implementation cannot be completed. Summary of the invention

In view of the above, the main purpose of the present invention is to provide a gateway selection method, an implementation device, and a system, which are used to solve the problem that when a mobile network operator moves a data plane gateway downward, the gateway selection based on the user location cannot be implemented, thereby realizing Technical problem of WLAN network data offloading.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for selecting a gateway, the method comprising:

The user terminal includes the identifier information or the local gateway label in the global domain name FQDN sent to the domain name server DNS, and the DNS queries the packet gateway according to the FQDN; the packet gateway includes an evolved packet data gateway ePDG and/or a packet data gateway P. -GW.

Further, in a scenario where the wireless local area network WLAN is used as the access network, the WLAN is used as the access network, and the ePDG is used to access the evolved packet core EPC network, and the ePDG and the P-GW are in the S2b interface. The WLAN is the RAI or TAI in the wireless network broadcast message transmitted by the universal mobile communication system terrestrial radio access network UTRAN or the evolved universal mobile communication system terrestrial radio access network E-UTRAN in the 3rd Generation Partnership Project 3GPP, The user terminal constructs an FQDN for selecting an ePDG according to the RAI or TAI, and includes the RAI or TAI in the FQDN sent to the DNS, where the DNS is according to the The FQDN queries the ePDG.

Further, in a scenario where the WLAN is used as the untrusted 3GPP access, the ePDG accesses the evolved packet core EPC network, and the ePDG and the P-GW adopt the S2b interface, the identifier information is in the wireless network broadcast message sent by the WLAN. The service set identifier SSID, the user terminal constructs an FQDN for selecting an ePDG according to the SSID, and includes the SSID in the FQDN sent to the DNS, and the DNS queries the ePDG according to the FQDN.

Further, in a scenario where the WLAN is used as the untrusted 3GPP access, the ePDG accesses the EPC network of the evolved packet core network, and the S2b interface is adopted between the ePDG and the P-GW, the user terminal is configured according to the local gateway label. The FQDN of the ePDG is selected, and the local gateway label is included in the FQDN sent to the DNS, and the DNS queries the ePDG according to the FQDN.

Further, the method further includes: the ePDG constructs an FQDN for selecting a P-GW according to the configured ePDG identifier or a local gateway label, and includes the ePDG identifier in the FQDN sent to the DNS or A local gateway tag, the DNS queries the P-GW according to the FQDN.

Further, in a scenario where the WLAN is used as the untrusted 3GPP access, the ePDG is used to access the EPC network, and the S2c interface is used between the user terminal and the P-GW, the identifier information is covered by the WLAN as the access network. The RAI or TAI in the radio network broadcast message transmitted by the 3GPP UTRAN or the E-UTRAN, the user terminal constructs an FQDN for selecting the ePDG according to the RAI or TAI and/or an FQDN for selecting the P-GW, to the DNS The RQ or TAI is included in the sent FQDN, and the DNS queries the ePDG and/or the P-GW according to the FQDN.

Further, in a scenario where the WLAN is used as the untrusted 3GPP access, and the ePDG is used to access the EPC network, and the S2c interface is used between the user terminal and the P-GW, the identifier information is a service in the wireless network broadcast message sent by the WLAN. Set identifier SSID, according to the user terminal The SSID is included in the FQDN sent by the DNS, and the DNS queries the ePDG and/or the P-GW according to the FQDN.

Further, in a scenario where the WLAN is used as the untrusted 3GPP access, and the ePDG is used to access the EPC network, and the S2c interface is adopted between the user terminal and the P-GW, the user terminal is configured to select the ePDG according to the local gateway label. FQDN and / or used to select P-GW

The DNS queries the ePDG and/or P-GW based on the FQDN.

Further, in a scenario where the WLAN is used as the trusted 3GPP access, and the S2c interface is adopted between the user terminal and the P-GW, the identifier information is sent by the 3GPP UTRAN or E-UTRAN that is covered by the WLAN as the access network. a RAI or TAI in a wireless network broadcast message, the user terminal constructs an FQDN for selecting a P-GW according to the RAI or TAI, and includes the RAI or TAI in the FQDN sent to the DNS, the DNS according to The FQDN queries the P-GW.

Further, in a scenario where the WLAN is used as the trusted 3GPP access, and the S2c interface is used between the user terminal and the P-GW, the identifier information is the SSID in the wireless network broadcast message sent by the WLAN, and the user terminal is configured according to the SSID. The FQDN for selecting a P-GW, the SSID is included in the FQDN sent to the DNS, and the DNS queries the P-GW according to the FQDN.

Further, in a scenario where the WLAN is used as the trusted 3GPP access, and the S2c interface is adopted between the user terminal and the P-GW, the user terminal constructs an FQDN for selecting the P-GW according to the local gateway label, in the DNS The local gateway label is included in the sent FQDN, and the DNS queries the P-GW according to the FQDN.

Based on the embodiment of the present invention, the present invention further provides a method for selecting a gateway, where the method includes: The evolved packet data gateway ePDG constructs an FQDN for selecting a packet data gateway P-GW according to the configured ePDG identifier or a local gateway label, and includes the ePDG identifier or the local gateway label in the FQDN sent to the DNS The DNS queries the P-GW according to the FQDN. According to an embodiment of the present invention, the present invention further provides a user terminal, where the user terminal includes: a receiving module, configured to receive a 3GPP UTRAN that is covered with a WLAN access network or

a wireless network broadcast message of the E-UTRAN; or receiving a wireless network broadcast message for receiving the WLAN access network;

a building module, configured to construct an FQDN for selecting an ePDG according to the identifier information in the wireless network broadcast message and/or an FQDN for selecting the P-GW;

And a querying module, configured to send the FQDN to the domain name server DNS to obtain an ePDG and/or a P-GW, where the FQDN for selecting the ePDG and/or the FQDN for selecting the P-GW includes the identifier information.

Further, the identifier information in the wireless network broadcast message is RAI, TAI or service set identifier SSID. Based on the embodiment of the present invention, the present invention further provides a user terminal, where the user terminal includes: a building module, configured to construct an FQDN for selecting an ePDG according to a local gateway label and/or an FQDN for selecting a P-GW;

a querying module, configured to send the FQDN to a domain name server DNS to obtain an ePDG and/or a P-GW, where the FQDN for selecting an ePDG and/or the FQDN for selecting a P-GW includes the local gateway label .

Based on an embodiment of the present invention, the present invention also provides a gateway selection system, the system comprising:

a first network element, configured to send, to the user equipment, a wireless network broadcast message that carries the identifier information; a user terminal, configured to receive the wireless network broadcast message and construct an FQDN for selecting an ePDG and/or an FQDN for selecting a P-GW according to the identifier information in the wireless network broadcast message, and send the FQDN that includes the identifier information Give the domain name server;

And a domain name server, configured to receive the FQDN, and query the user terminal for an ePDG and/or a P-GW, and feed back the ePDG list and/or the P-GW list to the user terminal.

Further, the first network element is a 3GPP UTRAN or E-UTRAN that is covered by the WLAN access network, and the identifier information in the broadcast message of the wireless network is RAI or TAI; or

The first network element is a WLAN access network, and the identifier information in the wireless broadcast message is an SSID.

Further, the ePDG is configured to construct an FQDN for selecting a P-GW according to the configured ePDG identifier or a local gateway label, and send an FQDN including an ePDG identifier or a local gateway label to the domain name server; The P-GW is queried according to the FQDN sent by the ePDG. Based on an embodiment of the present invention, the present invention also provides a gateway selection system, the system comprising:

a user terminal, configured to configure, according to the local gateway label, an FQDN for selecting an ePDG and/or an FQDN for selecting a P-GW, and sending the FQDN including the local gateway label to the domain name server;

Further, the ePDG is configured to construct an FQDN for selecting a P-GW according to the configured ePDG identifier or a local gateway label, and send an FQDN including an ePDG identifier or a local gateway label to the domain name server; The P-GW is queried according to the FQDN sent by the ePDG. Based on the embodiment of the present invention, the present invention further provides an evolved data gateway ePDG, including: a first module, configured to construct, according to the configured identifier of the ePDG or a local gateway label, a packet data gateway P-GW. FQDN;

And a second module, configured to send, to the domain name server DNS, an FQDN that includes the ePDG identifier or a local gateway label to query the P-GW. In the present invention, the user terminal constructs a global domain name FQDN for selecting the evolved data gateway ePDG and/or an FQDN for selecting the packet data gateway P-GW according to the identification information in the wireless network broadcast message or the local gateway label, thereby triggering the DNS. The ePDG and/or P-GW close to the wireless side are queried, thereby implementing the function of diverting data in the WLAN network.

It should be noted that the DNS queries the ePDG and/or P-GW according to the FQDN containing the identification information or the local gateway label to select an ePDG and/or P-GW selection equivalent to the location based on the user. DRAWINGS

1 is a schematic structural diagram of an evolved packet domain system;

2 is a schematic diagram of a gateway selection and user terminal access flow according to Embodiment 1 of the present invention; FIG. 3 is a schematic diagram of gateway selection and user terminal access flow according to Embodiment 2 of the present invention; FIG. 4 is a gateway selection and method according to Embodiment 3 of the present invention; FIG. 5 is a schematic diagram of gateway selection and user terminal access flow according to Embodiment 4 of the present invention; FIG. 6 is a schematic diagram of gateway selection and user terminal access flow according to Embodiment 5 of the present invention; FIG. 8 is a schematic diagram of a gateway selection and a user terminal access flow according to Embodiment 7 of the present invention; FIG. 9 is a gateway selection and user terminal access procedure according to Embodiment 8 of the present invention; FIG. 10 is a schematic flowchart of gateway selection and user terminal access according to Embodiment 9 of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

The scenario in this embodiment is that the WLAN is used as an untrusted 3GPP access, and the ePDG is used to access the EPC network. The e2G and the P-G W use an S2b interface. The specific process of this embodiment is shown in Figure 2:

Step 201: The user terminal needs to perform access authorization and authentication with the AAA server of the core network when accessing the WLAN as the untrusted 3GPP access network. The role of the AAA proxy is to forward the authorization authentication message to the AAA Server. After accessing the authorization and authentication process, the user is allowed to access the core network through the WLAN.

Step 202: The user terminal monitors a Routing Area Identity (RAI) or a Tracking Area Indentity (TAI) in a 3GPP UTRAN or E-UTRAN network broadcast message that is covered by the WLAN access network.

Step 203: The user terminal constructs a Fully Qualified Domain Name (FQDN) for selecting an ePDG according to the received RAI or TAI. The constructed FQDN can be a separate RAI FQDN or TAI FQDN, or the RAI or TAI information can be added to the current ePDG FQDN as a new tag entry.

Step 204: The user terminal starts a query of a domain name server (DNS).

Step 205: The DNS system sends, in the returned response message, the ePDG list information that matches the FQDN to the UE, where the address information of the ePDG is included. The ePDG included in the list information is the ePDG that is retrieved by the DNS system and is close to the wireless side of the user.

Step 206: The user terminal selects an ePDG from the ePDG list information for use. Step 207: Perform an Internet Key Exchange Protocol version 2 (IKEv ² ) authentication and an Internet Protocol Security (IPSec) tunnel establishment process between the user terminal and the selected ePDG. The access authorization and authentication process between the ePDG and the AAA Server.

Step 208: The selected ePDG constructs an FQDN for selecting the P-GW according to the configured ePDG identifier (ID) information or the local gateway label, so as to select a P-GW that is close to the ePDG. The local gateway label is used to indicate that the ePDG desires to select a P-GW close to the network element, which can be generated locally. The constructed FQDN can be a separate ePDG ID FQDN or a local gateway FQDN. The ePDG identifier or local gateway label information can also be added to the current ePDG FQDN as a new label entry.

Step 209: The ePDG starts a DNS query process, and sends the constructed FQDN including the ePDG identifier or the local gateway label to the DNS system for P-GW query.

Step 210: The DNS system sends the P-GW list information matching the FQDN to the ePDG, including the address information of the P-GW, in the returned response message according to the network topology. The P-GW included in the list information is the P-GW that is retrieved by the DNS system and is close to the ePDG.

Step 211: The ePDG selects a P-GW to use from the P-GW list information.

Step 212-Step 213: A PMIP tunnel is established between the ePDG and the P-GW.

Step 214: After the ePDG establishes a PMIP tunnel with the P-GW, the ePDG is completely authenticated by the user terminal, and the IPsec tunnel is established.

Step 215: The ePDG sends the IP address assigned by the P-GW to the user in step 213 to the user terminal by using the IKEv2 message.

After the process, the IPsec tunnel between the user terminal and the ePDG, and the establishment of the PMIP tunnel between the ePDG and the P-GW are completed, and can be used to transmit uplink and downlink data.

The user terminal initiates a new PDN connection establishment process in the WLAN access network, which is similar to the current process. The difference is that the user terminal selects the ePDG when the initial attachment is performed, that is, the ePDG selected in the above step 206, and the ePDG reselection is no longer performed. . The ePDG will be configured according to its own ePDG id/ The local gateway label and the access point name (APN) requested by the user regenerate the FQDN for P-GW selection in the same manner as steps 208 to 211.

Example 2

The scenario in this embodiment is that the WLAN is used as the untrusted 3GPP access, and the ePDG is used to access the EPC network. The S2c interface is adopted between the user terminal and the P-GW. The specific process of this embodiment is shown in Figure 3:

Step 301: The user terminal needs to perform access authorization and authentication with the AAA server of the core network when accessing the WLAN as the untrusted 3GPP access network. The role of the AAA proxy is to forward the authorization authentication message to the AAA Server. After accessing the authorization and authentication process, the user is allowed to access the core network through the WLAN.

Step 302: The user terminal monitors the RAI or TAI in the 3GPP UTRAN or E-UTRAN network broadcast message with the WLAN access network.

Step 303: The user terminal constructs an FQDN for selecting an ePDG according to the received RAI or TAI and/or an FQDN for selecting the P-GW. When the user terminal initially accesses from the WLAN network, the ePDG and the P-GW are selected. When the user terminal establishes a new PDN connection after the WLAN network is attached, the P-GW is selected, when the user switches from the 3GPP network to the WLAN network. Make a choice of ePDG. The user terminal can construct the required FQDN according to different scenarios.

Step 304: The user terminal starts a DNS query, and sends the constructed FQDN containing the RAI or the TAI to the DNS system for querying the ePDG and/or the P-GW. The constructed FQDN can be a separate RAI FQDN or TAI FQDN, or RAI or TAI information can be added to the current ePDG and or P-GW FQDN as a new tag entry.

Step 305: The DNS system sends, in the returned response message, the ePDG and/or P-GW list information that matches the FQDN to the UE, where the address information of the ePDG and/or the P-GW is included. The ePDG and/or P-GW included in the list information is an ePDG and/or P-GW that is retrieved by the DNS system and is close to the user's wireless side. Step 306: The user terminal selects one ePDG and/or P-GW from the ePDG and/or P-GW list information for use.

Step 307: The user terminal starts an IKEv2 tunnel establishment process.

Step 308: The ePDG carries the internal IP address allocated by the ePDG for the user terminal for use in the IPsec tunnel in the last IKEv2 message.

Step 309: The establishment of the IPSec tunnel between the user terminal and the ePDG is completed.

Step 310: Establish a security association between the user terminal and the P-GW to protect the dual stack Mobile Internet Protocol (DSMIP) message between the UE and the P-GW. In this process, the P-GW allocates an IPv6 home network prefix to the user and sends it to the user terminal. The user terminal constructs the home address through automatic configuration.

Step 311 and step 312, the UE and the P-GW establish a DSMIP tunnel by binding the update message.

Step 313 and step 314, the establishment of the IP connection is completed through the above process.

The process of establishing a new PDN connection in the WLAN access network is similar to the current process. The difference is that the user terminal selects the ePDG when the initial connection is performed, that is, the ePDG selected in the foregoing step 306, and the ePDG is not reselected. . The user terminal re-generates the FQDN according to the RAI or TAI and the APN requested by the user to perform P-GW selection in the same manner as steps 304 to 305.

When the user switches from the 3GPP network to the WLAN network, the user terminal does not need to perform the P-GW selection, and the user terminal uses the process of steps 303-306 to find the ePDG close to the user side. Example 3

The scenario that this embodiment is directed to is the WLAN as the trusted 3GPP access, and the S2c interface is adopted between the user terminal and the P-GW. The specific process of this embodiment is shown in Figure 4:

Step 401: The user terminal needs to perform access authorization and authentication with the AAA Server of the core network when accessing the WLAN as the untrusted 3GPP access network. The role of AAA proxy is to turn Send an authorization authentication message to the AAA Server. After accessing the authorization and authentication process, the user is allowed to access the core network through the WLAN.

Step 402: The user terminal monitors the RAI or TAI in the 3GPP UTRAN or E-UTRAN network broadcast message with the WLAN access network.

Step 403: The user terminal constructs an FQDNo for selecting the P-GW according to the received RAI or TAI.

Step 404: The user terminal starts a DNS query, and sends the constructed FQDN including the RAI or the TAI to the DNS system for P-GW query. The constructed FQDN can be a separate RAI FQDN or TAI FQDN, or the RAI or TAI information can be added to the current P-GW FQDN as a new tag entry.

Step 405: The DNS system sends the P-GW list information matching the FQDN to the UE in the returned response message, where the address information of the P-GW is included. The P-GW included in the list information is a P-GW that is retrieved by the DNS system and is close to the wireless side of the user.

Step 406: The user terminal selects a P-GW from the P-GW list information for use. Step 407: A layer three connection is established between the UE and the WLAN access network. After the end of this process, the access network assigns an IPv4 address or an IPv6 address/prefix to the user terminal. This address is the local IP address.

Step 408: A security association is established between the user terminal and the P-GW to protect the DSMIP message between the UE and the P-GW. In this process, the P-GW allocates an IPv6 home network prefix to the user and sends it to the user terminal. The user terminal constructs the home address through automatic configuration.

Step 409 and step 410, the UE and the P-GW establish a DSMIP tunnel by binding the update message.

The process of establishing a new PDN connection in the WLAN access network of the user terminal is the same as this process and will not be described again. Example 4 The scenario in this embodiment is that the WLAN is an untrusted 3GPP access, and the EPDG is used to access the EPC network. The S2b interface is adopted between the ePDG and the PG W. The specific process of this embodiment is shown in FIG. 5. This embodiment differs from Embodiment 1 in that:

Step 502: The user terminal monitors a Service Set Identifier (SSID) in the WLAN access network broadcast message.

Step 503: The user terminal constructs an FQDN for selecting an ePDG according to the received SSID. The constructed FQDN can be a separate SSID FQDN, or the SSID information can be added to the current ePDG FQDN as a new tag entry.

Step 504: The user terminal starts a DNS query, and sends the constructed FQDN containing the SSID to the DNS system for querying the ePDG.

The remaining steps in this embodiment are the same as in Embodiment 1, and are not described here. Example 5

The scenario in this embodiment is that the WLAN is used as the untrusted 3GPP access, and the ePDG is used to access the EPC network. The S2c interface is adopted between the user terminal and the P-GW. The specific process of this embodiment is shown in Fig. 6. This embodiment differs from the embodiment 2 in that:

Step 602: The user terminal listens to the SSID in the WLAN access network broadcast message.

Step 603: The user terminal constructs an FQDN for selecting an ePDG and/or selecting a P-GW according to the received SSID. The constructed FQDN can be a separate SSID FQDN, or the SSID information can be added to the current ePDG and/or P-GW FQDN as a new tag entry.

Step 604: The user terminal initiates a DNS query, and sends the constructed FQDN including the SSID to the DNS system for querying the ePDG and/or the P-GW.

The remaining steps in this embodiment are the same as in Embodiment 2, and are not described here. Example 6

The scenario targeted by this embodiment is a WLAN as an untrusted 3GPP access, a user terminal, and The S2c interface is adopted between the P-GWs. The specific process of this embodiment is shown in FIG. 7. This embodiment differs from Embodiment 3 in that:

Step 702: The user terminal listens to the SSID in the WLAN access network broadcast message.

Step 703: The user terminal constructs an FQDN for selecting the P-GW according to the received SSID. The constructed FQDN can be a separate SSID FQDN, or the SSID information can be added to the current P-GW FQDN as a new tag entry.

Step 704: The user terminal starts a DNS query, and sends the constructed FQDN including the SSID to the DNS system for P-GW query.

The remaining steps in this embodiment are the same as in Embodiment 3, and are not described here. Example 7

The scenario in this embodiment is that the WLAN is used as an untrusted 3GPP access, and the ePDG is used to access the EPC network. The e2G and the P-G W use an S2b interface. The specific flow of this embodiment is as shown in FIG. 8. This embodiment differs from Embodiment 1 in that:

Step 802: The user terminal constructs an FQDN for selecting an ePDG according to the local gateway label. The constructed FQDN can be a separate local gateway FQDN, or the local gateway label information can be added to the current ePDG FQDN as a new label item. ePDG gateway, which can be generated locally. When the user terminal chooses to use the local gateway label to construct an FQDN for selecting ePDG, it can be based on logic:

a) whether the user terminal can know the VPLMN ID of the network in which it is located and/or the VPLMN ID of the home network to which it belongs, the user terminal uses the local gateway label to construct the FQDN for selecting the FQDN of the ePDG;

b) if the operation according to step a) cannot query the suitable ePDG and the user terminal can know the VPLMN ID of the network in which it is located, then the user terminal constructs the FQDN for selecting the ePDG according to the VPLMN ID; c) If the appropriate ePDG cannot be queried according to the operation described in steps a) or b) and the user terminal is able to know the HPLMN ID of its home network, then the user terminal constructs an FQDN for selecting the ePDG based on the HPLMN ID.

It should be noted that, in this embodiment, when the user terminal uses the local gateway label to construct the FQDN for selecting the ePDG, all possible logics are included in the scope of the present invention.

Step 803: Since the local gateway label is a parameter indicating the will, and does not include any information about the location of the user terminal, the DNS system needs to output the location and the DNS according to the network topology when receiving the FQDN query including the local gateway label. Peer ePDG.

The remaining steps in this embodiment are the same as in Embodiment 1, and are not described here. Example 8

The scenario in this embodiment is that the WLAN is used as the untrusted 3GPP access, and the ePDG is used to access the EPC network. The S2c interface is adopted between the user terminal and the P-GW. The specific process of this embodiment is shown in Fig. 9. This embodiment differs from Embodiment 2 in that:

Step 902: The user terminal constructs an FQDN for selecting an ePDG and/or a P-GW according to the local gateway label. Similar to step 303, when the user terminal initially accesses from the WLAN network, the ePDG and the P-GW are selected, and when the user terminal establishes a new PDN connection after the WLAN network is attached, the P-GW is selected, when the user is from the 3GPP network. The ePDG selection is made when switching to a WLAN network. The user terminal can construct the required FQDN according to different scenarios.

The constructed FQDN can be a separate local gateway FQDN, or the local gateway label information can be added to the current ePDG and/or P-GW FQDN as a new label item.

The local gateway tag in this embodiment is used to indicate that the user desires to select a proximity to the radio side ePDG and/or P-GW gateway.

When the user terminal selects to use the local gateway label to construct the FQDN for selecting the ePDG, the logic described in step 802 may be used, which is not described in this embodiment. When the user terminal chooses to use the local network label to construct the FQDN for selecting the P-GW, it can be based on the following logic:

a) obtaining the P-GW address by attaching or requesting the PCO in the PDN connection process; b) obtaining the P-GW address by establishing an IKEV2 tunnel establishment procedure to the ePDG; c) if a), b) do not receive P- in two steps The IP address of the GW and if the user terminal knows that if the IP address of the P-GW is not obtained in the above three steps, the user terminal starts the DNS query of the corresponding P-GW IP address by constructing the FQDN of the P-GW through the local gateway label.

It should be noted that, in this embodiment, when the user terminal uses the local gateway label to construct the FQDN for selecting the P-GW, all possible logics are included in the scope of the present invention.

Step 903: The user terminal initiates a DNS query process to search for an ePDG and/or a P-GW that is close to the wireless side. Since the local gateway label is a parameter indicating the will, and does not include any information about the location of the user, the DNS system is required to receive such a The FQDN query containing the local gateway label outputs an ePDG and/or P-GW with the same level as the DNS according to the network topology structure.

The remaining steps in this embodiment are the same as in Embodiment 2, and are not described here. Example 10

The scenario that this embodiment is directed to is the WLAN as the trusted 3GPP access, and the S2c interface is adopted between the user terminal and the P-GW. The specific flow of this embodiment is shown in Fig. 10. This embodiment differs from the embodiment 3 in that:

Step 1002: The user terminal constructs an FQDN for selecting a P-GW according to the local gateway label. The constructed FQDN can be a separate local gateway FQDN, or the local gateway label information can be added to the current P-GW FQDN as a new label item.

The logic upon which the user terminal chooses to use the local gateway tag to construct the FQDN for selecting the P-GW is as described in step 902. Step 1003: The user terminal initiates a DNS query process to find a P-GW that is close to the wireless side. Since the local gateway label is a parameter indicating the will, and does not include any information about the location of the user, the DNS system needs to receive such a local gateway label. The FQDN is queried according to the network topology structure and outputs the P-GW at the same level as the DNS.

The remaining steps in this embodiment are the same as in Embodiment 3, and are not described here. Example 11

Based on the foregoing method embodiment, the embodiment provides a user terminal, where the user terminal includes: a receiving module, configured to receive a 3GPP UTRAN that is covered with a WLAN access network or

Preferably, the identifier information in the wireless network broadcast message is RAI, TAI or a service set identifier SSID. Example 12

Based on the foregoing method embodiment, the embodiment provides a user terminal, where the user terminal includes: a building module, configured to construct an FQDN for selecting an ePDG according to a local gateway label and/or an FQDN for selecting a P-GW;

a querying module, configured to send the FQDN to a domain name server DNS to obtain an ePDG and/or a P-GW, where the FQDN for selecting an ePDG and/or the FQDN for selecting a P-GW includes the local gateway label . Since the user terminal is implemented based on the foregoing method embodiment, the function module or the functional unit included in the user terminal is designed to implement the steps in the foregoing method embodiments, and the functions thereof can be directly from the steps of the foregoing method embodiment. For the specific functions of each module, refer to the foregoing method embodiments. For the sake of space saving, no further details are provided here. Example 13

Based on the foregoing method embodiment, the embodiment provides a gateway selection system, and the system includes:

a first network element, configured to send a wireless network broadcast message carrying the identification information to the user terminal, and configured to receive the wireless network broadcast message and construct an FQDN for selecting the ePDG according to the identifier information in the wireless network broadcast message. / or used to select the FQDN of the P-GW, and send the FQDN containing the identification information to the domain name server;

The ePDG is configured to construct an FQDN for selecting a P-GW according to the configured ePDG identifier or a local gateway label, and send an FQDN including an ePDG identifier or a local gateway label to the domain name server;

The domain name server is further configured to query the P-GW according to the FQDN sent by the ePDG. Example 14

Based on the foregoing method embodiment, the embodiment provides a gateway selection system, and the system package a user terminal, configured to configure, according to the local gateway label, an FQDN for selecting an ePDG and/or an FQDN for selecting a P-GW, and send the FQDN including the local gateway label to the domain name server;

Further, the ePDG is configured to construct an FQDN for selecting a P-GW according to the configured ePDG identifier or a local gateway label, and send an FQDN including an ePDG identifier or a local gateway label to the domain name server; The P-GW is queried according to the FQDN sent by the ePDG. Example 15

Based on the foregoing method embodiment, the embodiment provides a method for selecting a gateway, where the method includes:

The evolved packet data gateway ePDG constructs an FQDN for selecting a packet data gateway P-GW according to the configured ePDG identifier or a local gateway label, and includes the ePDG identifier or the local gateway label in the FQDN sent to the DNS The DNS queries the P-GW according to the FQDN.

Correspondingly, the present invention also provides an evolved data gateway ePDG, including:

a first module, configured to configure, according to the configured identifier of the ePDG or a local gateway label, an FQDN for selecting a packet data gateway P-GW;

The second module is configured to send, to the domain name server DNS, an FQDN that includes the ePDG identifier or the local gateway label to query the P-GW. Since the system embodiment is implemented based on the foregoing method embodiments, the functional modules or functional units included in the system are all configured to implement the steps in the foregoing method embodiments, and the functions thereof can be directly from the steps of the foregoing method embodiments. Exported in the process, based on different scenarios, each module For specific functions, refer to the foregoing method embodiments. To save space, no further details are provided here.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Industrial applicability

The user terminal of the present invention constructs a global domain name FQDN for selecting an evolved data gateway ePDG and/or an FQDN for selecting a packet data gateway P-GW according to the identification information in the wireless network broadcast message or the local gateway label, thereby triggering a DNS query close to The ePDG and/or P-GW on the wireless side further implements the function of offloading data in the WLAN network.

Claims

Claim

1. A method for selecting a gateway, the method comprising:

The user terminal includes the identifier information or the local gateway label in the global domain name FQDN sent to the domain name server DNS, and the DNS queries the packet gateway according to the FQDN;

The packet gateway includes an evolved packet data gateway ePDG and/or a packet data gateway

The method according to claim 1, wherein in the scenario where the wireless local area network WLAN is used as the untrusted 3GPP access, the ePDG accesses the evolved packet core EPC network, and the ePDG and the P-GW adopt the S2b interface. The identification information is sent by the universal mobile communication system terrestrial radio access network UTRAN or the evolved universal mobile communication system terrestrial radio access network E-UTRAN in the 3rd Generation Partnership Project 3GPP, which is covered by the WLAN as the access network. a routing area identifier RAI or a location area identifier TAI in the wireless network broadcast message, the user terminal constructs an FQDN for selecting an ePDG according to the RAI or TAI, and includes the RAI or TAI in the FQDN sent to the DNS, The DNS queries the ePDG according to the FQDN.

The method according to claim 1, wherein in the scenario where the WLAN is used as the untrusted 3GPP access, the ePDG accesses the evolved packet core EPC network, and the ePDG and the P-GW adopt the S2b interface, the identifier is used. The information is a service set identifier SSID in the wireless network broadcast message sent by the WLAN, and the user terminal constructs an FQDN for selecting the ePDG according to the SSID, and the SSID is included in the FQDN sent to the DNS, where the DNS is based on The FQDN queries the ePDG.

4. The method according to claim 1, wherein the WLAN is used as an untrusted 3GPP access, and the ePDG accesses the evolved packet core network EPC network, and the ePDG and the P-GW are collected. In the scenario of using the S2b interface, the user terminal is configured to select a sign according to the local gateway label, and the DNS queries the ePDG according to the FQDN.

The method according to claim 2 or 3 or 4, wherein the method further comprises: the ePDG is configured for selecting according to the configured ePDG identifier or the local gateway label.

The FQDN of the P-GW includes the ePDG identifier or the local gateway label in the FQDN sent to the DNS, and the DNS queries the P-GW according to the FQDN.

The method according to claim 1, wherein in the scenario where the WLAN is used as the untrusted 3GPP access, the ePDG is used to access the EPC network, and the S2c interface is used between the user terminal and the P-GW, the identifier information is The RAI or TAI in the wireless network broadcast message transmitted by the 3GPP UTRAN or E-UTRAN that is covered by the WLAN as the access network, the user terminal constructs an FQDN for selecting the ePDG according to the RAI or TAI and/or for selecting P - FQDN of the GW, the FQDN queries the ePDG and/or the P-GW.

The method according to claim 1, wherein in the scenario where the WLAN is used as the untrusted 3GPP access, the ePDG is used to access the EPC network, and the S2c interface is used between the user terminal and the P-GW, the identifier information is a service set identifier SSID in a wireless network broadcast message transmitted by the WLAN, the user terminal constructs an FQDN for selecting an ePDG according to the SSID and/or an FQDN for selecting a P-GW, in the FQDN sent to the DNS The SSID is included, and the DNS queries the ePDG and/or the P-GW according to the FQDN.

8. The method according to claim 1, wherein the WLAN is used as an untrusted 3GPP access, and the ePDG accesses the EPC network, and the user terminal and the P-GW adopt an S2c interface. In the scenario, the user terminal constructs an FQDN for selecting an ePDG according to the local gateway label and/or an FQDN for selecting a P-GW, where the local gateway label is included in the FQDN sent to the DNS. The DNS queries the ePDG and/or the P-GW according to the FQDN.

The method according to claim 1, wherein in the scenario where the WLAN is used as the trusted 3GPP access, and the S2c interface is adopted between the user terminal and the P-GW, the identifier information is the same as the WLAN as the access network. The RAI or TAI in the wireless network broadcast message sent by the covered 3GPP UTRAN or E-UTRAN, the user terminal constructs according to the RAI or TAI for selecting the DNS to query the P-GW according to the FQDN.

The method according to claim 1, wherein in the scenario where the WLAN is used as the trusted 3GPP access, and the S2c interface is used between the user terminal and the P-GW, the identifier information is in the wireless network broadcast message sent by the WLAN. The SSID, the user terminal constructs an FQDN for selecting a P-GW according to the SSID, and includes the SSID in the FQDN sent to the DNS, and the DNS queries the P-GW according to the FQDN.

The method according to claim 1, wherein, in a scenario where the WLAN is used as the trusted 3GPP access, and the S2c interface is adopted between the user terminal and the P-GW, the user terminal is configured to select P according to the local gateway label. The FQDN of the GW, the local gateway label is included in the FQDN sent to the DNS, and the DNS queries the P-GW according to the FQDN.

12. A method for selecting a gateway, the method comprising:

The evolved packet data gateway ePDG constructs an FQDN for selecting a packet data gateway P-GW according to the configured ePDG identifier or a local gateway label, and includes the ePDG identifier or a local gateway label in the FQDN sent to the DNS, the DNS Query according to the FQDN

13. A user terminal, the user terminal comprising:

a receiving module, configured to receive a wireless network broadcast message of a 3GPP UTRAN or an E-UTRAN that is covered by the WLAN access network; or receive a broadcast message for receiving the WLAN access network wireless network;

The user terminal according to claim 13, wherein the identifier information in the wireless network broadcast message is RAI, TAI or a service set identifier SSID.

15. A user terminal, wherein the user terminal comprises:

a building module, configured to construct an FQDN for selecting an ePDG according to a local gateway label and/or an FQDN for selecting a P-GW;

16. A gateway selection system, wherein the system comprises:

a first network element, configured to send a wireless network broadcast message carrying the identification information to the user terminal, and configured to receive the wireless network broadcast message and construct an FQDN for selecting the ePDG according to the identifier information in the wireless network broadcast message. / or used to select the FQDN of the P-GW, Sending the FQDN containing the identification information to the domain name server;

17. The system of claim 16 wherein

The first network element is a 3GPP UTRAN or E-UTRAN that is covered by the WLAN access network, and the identifier information in the broadcast message of the wireless network is RAI or TAI; or

The system according to claim 17, wherein the system further comprises an ePDG, where the ePDG is configured to be configured according to the configured ePDG identifier or the local gateway label.

The FQDN of the P-GW, and sends an FQDN containing the ePDG identifier or the local gateway label to the domain name server;

The domain name server is further configured to query the P-GW according to the FQDN sent by the ePDG.

19. A gateway selection system, wherein the system comprises:

The system according to claim 19, wherein the system further comprises an ePDG, the ePDG configured to be configured for selection according to the configured ePDG identifier or the local gateway label.

An FQDN of the P-GW, and sending an FQDN including an ePDG identifier or a local gateway label to the domain name server; The domain name server is further configured to query the P-GW according to the FQDN sent by the ePDG.

21. An evolved packet data gateway ePDG, wherein:

And a second module, configured to send, to the domain name server DNS, an FQDN that includes the ePDG identifier or a local gateway label to query the P-GW.