WO2011144122A2

WO2011144122A2 - Network selection method, device and system

Info

Publication number: WO2011144122A2
Application number: PCT/CN2011/074894
Authority: WO
Inventors: 曹文利
Original assignee: 华为技术有限公司
Priority date: 2011-05-30
Filing date: 2011-05-30
Publication date: 2011-11-24
Also published as: WO2011144122A3; CN102273279A

Abstract

A network selection method, device and system are provided by the present invention. The method includes the following steps: from network selection strategy information stored in an Access Network Discovery and Selection Function (ANDSF) agent unit, the network selection strategy information corresponding to a User Equipment (UE) is obtained, wherein the network selection strategy information includes information of an access network that the UE could preferably select; from access network discovery information stored in the ANDSF agent unit, the access network discovery information corresponding to the UE is obtained, wherein the access network discovery information is obtained from a radio control device in the access network, and the access network discovery information is used for access network discovery and selection; and according to the network selection strategy information and said access network discovery information, the suitable access network is selected as the target access network of the UE.

Description

Network selection method, device and system

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a network selection method, device, and system. Background technique

At present, any single wireless communication system is difficult to meet the requirements of the user for various aspects of the wireless communication service, that is, the requirements of high mobility, large coverage, good voice service quality, and strong data service capability. Therefore, there is a trend of convergence between wireless communication networks, that is, wireless communication networks based on different wireless access technologies coexist in a certain area to jointly provide services for users.

In the prior art, an Access Network Discovery and Selection Function (ANDSF) server may be configured in the core network to store user equipment (User Equipment; UE) for preferred access. Network information of the network and network information of available access networks. After the user equipment accesses the network, the service of the user equipment and the user equipment can be switched to the preferred network through the foregoing information stored in the ANDSF server, thereby optimizing the service.

However, due to the mobile characteristics of wireless communication, the traffic load of the cell and the number of users of the cell may change at any time, and the change of each cell is also different, and the congestion of the traffic is also different in each cell. Therefore, the core network does not perceive the traffic situation of the cell in which the access network is located, and thus the network information of the available access network stored in the ANDSF server in the core network does not have real-time performance, and thus the user equipment cannot be switched to an appropriate one. In the access network, the user experience is reduced. Summary of the invention

The embodiments of the present invention provide a network selection method, device, and system, which are used to implement user equipment selection into a suitable access network, and effectively improve user experience.

The embodiment of the invention provides a network selection method, including: Acquiring, by the network selection policy information saved by the access network discovery and selection function ANDSF proxy unit, the network selection policy information corresponding to the user equipment UE, where the network selection policy information includes the access network information that the UE can optimize;

Obtaining, from the access network discovery information saved by the ANDSF proxy unit, access network discovery information corresponding to the UE, where the access network discovery information is obtained from a wireless control device in the access network, where The access network discovery information is used for discovery and selection of the access network;

And selecting, according to the network selection policy information and the access network discovery information, a suitable access network as the target access network of the UE. The embodiment of the invention provides a network selection device, including:

a network selection policy information acquiring unit, configured to obtain network selection policy information corresponding to the user equipment UE from the network selection policy information saved by the access network discovery and selection function ANDSF proxy unit, where the network selection policy information includes the UE Preferred access network information;

An access network discovery information acquiring unit, configured to acquire, from the access network discovery information saved by the ANDSF proxy unit, access network discovery information corresponding to the UE, where the access network discovery information is accessed from Obtained in a wireless control device in the network, where the access network discovery information is used for discovery and selection of the access network;

And a network selection unit, configured to select, according to the network selection policy information and the access network discovery information, a suitable access network as the target access network of the UE. An embodiment of the present invention provides a network selection system, including the network selection device and the wireless control device, where the wireless control device is configured to acquire and maintain the access network discovery information in an access network.

The network selection method, device, and system in the embodiment of the present invention obtain network selection policy information corresponding to the UE from the network selection policy information saved by the ANDSF proxy unit, and from the access network discovery information saved by the ANDSF proxy unit, Obtaining access network discovery information corresponding to the UE, and selecting an appropriate access network as the target access network of the UE according to the network selection policy and the access network discovery information, thereby ensuring real-time information of the access network discovery information, And guaranteed to choose for the UE To the appropriate access network, which effectively improves the user experience. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flow chart of an embodiment of a network selection method according to the present invention;

2 is a schematic structural diagram of a system networking for implementing network selection in a communication network system;

3 is a signaling diagram of another embodiment of a network selection method according to the present invention;

4 is a signaling diagram of still another embodiment of a network selection method according to the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a network selection device according to the present invention; FIG.

6 is a schematic structural diagram of another embodiment of a network selection device according to the present invention;

7a and 7b are schematic diagrams showing the structure of an embodiment of a network selection system according to the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of an embodiment of a network selection method according to the present invention. As shown in FIG. 1, the method in this embodiment includes:

Step 101: Obtain, from the network selection policy information saved by the ANDSF proxy unit, network selection policy information corresponding to the UE, where the network selection policy information includes access network information that the UE can optimize.

Step 102: Acquire, corresponding to the UE, the access network discovery information saved by the ANDSF proxy unit. Access network discovery information, wherein the access network discovery information is obtained from a wireless control device in the access network, and the access network discovery information is used for access network discovery and selection.

Specifically, in this embodiment, the ANDSF proxy unit may be configured in an access network device, where the access network discovery information may include: an available access network corresponding to the UE and a service of the available access network Load and quality, etc. The access network device is a device in the access network, and more specifically, the access network device may be a base station, a radio remote unit (RRU), a femto base station (femto), a pico base station. (Pico) Access Point (AP) or Wireless Fidelity (WiFi) AP.

In addition, it should be noted that the network selection policy information corresponding to the UE may be the network selection policy information corresponding to the identifier or type of the UE; the access network discovery information corresponding to the UE may be the identifier of the UE or the access network corresponding to the type. information. The identifier or type of the UE may be carried in a request message sent by the UE to the network side device (for example, the access network device).

Step 103: Select a suitable access network as the target access network of the UE according to the network selection policy information and the access network discovery information.

In this embodiment, when the UE accesses the network or performs network reselection/handover, the above method may be used to select a suitable access network as the target access network of the UE. Thereafter, the UE can be accessed to the target access network, that is, the service of the UE can be accessed to the target access network. The service may include all the services of the entire UE, or a service of a public data network (PDN) connection level, or an Internet Protocol (IP) flow level service. A specific example is: After the UE's service accesses the target access network, the UE can detect the quality of the service through packet detection (for example, Deep Packet Inspection (DPI)) and the core. The quality of the subscription service corresponding to the UE pre-stored in the network is relatively high. When the perceived service quality does not meet the quality of the subscription service, the method may be used to reselect the appropriate access network as the target access network of the UE. The UE switches to the target access network.

In the technical solution of the embodiment, the network selection policy information corresponding to the UE is obtained from the network selection policy information saved by the ANDSF proxy unit, and the access network saved from the ANDSF proxy unit is obtained. In the discovery information, the access network discovery information corresponding to the UE is obtained, and then the appropriate access network is selected as the target access network of the UE according to the network selection policy and the access network discovery information. Since the access network discovery information is obtained from the wireless control device in the access network, the real-time information of the access network discovery information is ensured, thereby ensuring that the appropriate access network is selected for the UE, thereby effectively improving the access network. User experience.

In various embodiments of the present invention, an implementation environment for implementing a network selection method may be specifically in the communication network system shown in FIG. 2. 2 is a schematic diagram of a system networking structure for implementing network selection in a communication network system, and the communication network system may include: an ANDSF server 11, an access network device 12, and a wireless control device 13 and a UE 14. The ANDSF server 11 may be disposed in the core network, the access network device 12 and the wireless control device 13 may be disposed in the access network, and the access network device 12 includes the ANDSF proxy unit 121.

FIG. 3 is a signaling diagram of another embodiment of a network selection method according to the present invention. As shown in FIG. 3, in this embodiment, based on the system architecture shown in FIG. 2, the network is specifically selected for access. The network device 12 is implemented as an example, and the technical solution of the embodiment is introduced in detail. As shown in FIG. 3, the method in this embodiment includes:

Step 201: The ANDSF proxy unit obtains a Fully Qualified Domain Name (FQDN) address of the ANDSF server in the core network through a Dynamic Host Configuration Protocol (DHCP) discovery process; and queries the domain name system. (Domain Name System; abbreviation: DNS), obtain the Internet Protocol address of the ANDSF server in the core network corresponding to the fully qualified domain name address.

In this embodiment, after the access network device is powered on, the discovery process of the ANDSF server may be performed to obtain the IP address of the ANDSF server.

In addition, another implementation manner can be used: After the access network device is powered on, the ANDSF proxy unit can also obtain the IP address of the ANDSF server in the core network by querying the local network management configuration table.

Step 202: The ANDSF proxy unit obtains pre-configured network selection policy information from the ANDSF server corresponding to the Internet Protocol address, where the network selection policy information has a corresponding relationship with the UE.

Step 203: The ANDSF proxy unit receives the access network discovery information that is sent by the wireless control device. The access network discovery information has a corresponding relationship with the UE.

Specifically, the wireless control device may be configured in the access network and has a control function for controlling the access network device, and may be used to acquire and maintain the access network discovery information in the access network. In addition, the wireless control device may also be single mode or multimode, and may include one or a combination of the following devices, or the wireless control device may integrate the functions of one or a combination of the following devices: /Base Network Controller/Base Transceiver Station (abbreviation: RNC/BTS), femto gateway (for example, Home NodeB (HNB) Gateway (Gateway; GW), or family evolution Home evolved NodeB (abbreviation: HeNB) GW), Pico gateway (for example: enterprise HNB GW, HeNB GW), Baseband Processing Unit (BBU), WiFi access controller (Access) Controller; abbreviation: AC) / Tunnel Terminating Gateway (TTG) / Packet Data Gateway (PDG) and Worldwide Interoperability for Microwave Access (WiMax) Access to the Access Services Network (ASN) GW.

In addition, the step may also use another implementation manner: the ANDSF proxy unit sends an acquisition request to the wireless control device, and receives access network discovery information returned by the wireless control device according to the acquisition request, where the access network discovery information and the UE have Correspondence relationship.

Step 204: The access network device receives the request message sent by the UE.

In this embodiment, the request message may be specifically a connection request message or a service switching request message.

Step 205: Obtain, from the network selection policy information saved by the ANDSF proxy unit, network selection policy information corresponding to the UE.

This step can be performed by the access network device. For example, a network selection policy information obtaining unit may be set in the access network device to perform this step.

Step 206: Acquire, from the access network discovery information saved by the ANDSF proxy unit, access network discovery information corresponding to the UE. This step can be performed by the access network device. For example, an access network discovery information acquiring unit can be set in the access network device to perform this step.

Step 207: Select a suitable access network as the target access network of the UE according to the network selection policy information and the access network discovery information.

This step can be performed by the access network device. For example, a network selection unit can be set in the access network device to perform this step.

In the technical solution of the embodiment, after the access network device is powered on, the ANDSF proxy unit acquires the network selection policy information pre-configured in the ANDSF server, and acquires the access network discovery information in the wireless control device; When the request message is sent, the access network device is triggered to obtain network selection policy information and access network discovery information corresponding to the UE from the ANDSF proxy unit, and then select an appropriate connection according to the network selection policy information and the access network discovery information. The network access is used as the target access network of the UE. Since the access network discovery information can be obtained from the wireless control device in the access network, the real-time performance of the access network information is ensured, thereby ensuring that the UE selects the appropriate target access network, thereby effectively improving the User experience. In addition, since the access network discovery information is obtained from the wireless control device in real time, the ANDSF server in the core network only needs to obtain the policy information, and does not need to obtain the access network discovery information from the ANDSF server in the core network, therefore, Effectively reduce the load on the ANDSF server in the core network.

Further, in another embodiment of the present invention, the method may further include:

The access network device obtains the Service Level Agreement (SLA) information corresponding to the UE from the ANDSF server or the Policy and Charging Rules Function (PCRF); wherein, the SLA The information includes the level information of the UE. Correspondingly, the access network device can preferentially access the UE with the highest level in the level information of the UE to the target access network according to the level information of the UE. In addition, in this embodiment, in the core network, the ANDSF server may be set in the policy rule function entity PCRF.

Further, based on the method embodiment shown in FIG. 3 above, another embodiment of the present invention In the embodiment, the other implementation manner of obtaining the network selection policy is as follows: The ANDSF proxy unit obtains the network selection policy information corresponding to the UE from the locally selected network selection policy information.

In this embodiment, the network selection policy information may be pre-configured in the access network device and saved, that is, the ANDSF server in the core network is set in the access network device, thereby effectively reducing the load of the core network. .

FIG. 4 is a signaling diagram of still another embodiment of the network selection method according to the present invention. In this embodiment, the implementation is described in detail based on the communication network system shown in FIG. 2, and the network selection is implemented in the UE as an example. The technical solution of the example, as shown in FIG. 4, the method of the present implementation includes:

Step 301: The ANDSF proxy unit obtains the FQDN address of the ANDSF server in the core network through the DHCP discovery process, and queries the DNS to obtain the IP address of the ANDSF server in the core network corresponding to the fully qualified domain name address.

Step 302: The ANDSF proxy unit acquires pre-configured network selection policy information in the ANDSF server corresponding to the Internet Protocol address.

Step 303: The ANDSF proxy unit receives the access network discovery information that is sent by the wireless control device. Specifically, the function introduction of the wireless control device can be referred to the foregoing embodiment.

In this embodiment, after the access network device is powered on, the discovery process of the ANDSF server may be performed to obtain the IP address of the ANDSF server. Another implementation manner is as follows: After the access network device is powered on, the ANDSF proxy unit can also obtain the IP address of the ANDSF server in the core network by querying the local network management configuration table.

Step 304: The UE sends a request message.

Step 305: The UE obtains an FQDN address of the ANDSF proxy unit in the access network device through the DHCP discovery process.

Step 306: The UE obtains an ANDSF proxy list corresponding to the FQDN address by querying the DNS. The IP address of the yuan.

Step 307: The UE obtains a network selection policy and access network discovery information corresponding to the UE from the ANDSF proxy unit corresponding to the IP address of the ANDSF proxy unit.

Step 308: The UE selects an appropriate access network as the target access network of the UE according to the network selection policy and the access network discovery information. The network selection policy and the access network discovery information corresponding to the UE, and then selecting an appropriate access network as the target access network of the UE according to the network selection policy and the access network discovery information, because when the UE sends the request message, The UE can obtain the access network discovery information from the ANDSF proxy unit, and the information is obtained from the wireless control unit. Therefore, the real-time information of the access network discovery information is ensured, thereby ensuring that the UE can switch to the appropriate access network. , which effectively improves the user experience.

FIG. 5 is a schematic structural diagram of an embodiment of a network selection device according to the present invention. As shown in FIG. 5, the network selection device in this embodiment includes: a network selection policy information acquiring unit 21, an access network discovery information acquiring unit 22, and a network selection. Unit 23. The network selection policy information acquiring unit 21 is configured to obtain, from the network selection policy information saved by the ANDSF proxy unit, the network selection policy information corresponding to the UE, where the network selection policy information includes the access network information that the UE can optimize; The discovery information obtaining unit 22 is configured to obtain, from the access network discovery information saved by the ANDSF proxy unit, access network discovery information corresponding to the UE, where the access network discovery information is obtained from the wireless control device in the access network, The access network discovery information is used for the discovery and selection of the access network. The network selection unit 23 is configured to select an appropriate access network as the target access network of the UE according to the network selection policy information and the access network discovery information.

In this embodiment, the ANDSF proxy unit may be configured in an access network device, where the access network discovery information may include: an available access network corresponding to the UE and a service load and quality of the available access network Wait. The access network device is a device in the access network, and more specifically, the access network device may be a base station, a radio remote unit (RRU), a femto base station ( femto), a pico base station. (Pico) Access Point (AP) or Wireless Fidelity (WiFi) AP. It should be noted that the network selection device of this embodiment can perform the technical solution of the method embodiment shown in FIG. 1 , and the implementation principles thereof are similar.

In the technical solution of the embodiment, the network selection policy information corresponding to the UE is obtained from the network selection policy information saved by the ANDSF proxy unit, and the access network discovery information saved by the ANDSF proxy unit is obtained, and the corresponding information is obtained from the UE. The access network discovery information, according to the network selection policy and the access network discovery information, selects an appropriate access network as the target access network of the UE, because the access network discovers information from the access network in the wireless control Obtained in the device, thus ensuring the real-time performance of the access network discovery information, thereby ensuring that the UE is selected to the appropriate access network, thereby effectively improving the user experience.

FIG. 6 is a schematic structural diagram of another embodiment of a network selection device according to the present invention. On the basis of the foregoing embodiment shown in FIG. 5, as shown in FIG. 6, the network selection device in this embodiment may be specifically an access network device. The access device includes an ANDSF proxy unit 24, configured to acquire an Internet Protocol address of the ANDSF server in the core network, and obtain pre-configured network selection policy information in the ANDSF server corresponding to the Internet Protocol address, the network selection policy information and the UE. Corresponding relationship; or, the ANDSF proxy unit 24 is configured to pre-configure network selection policy information locally, and the network selection policy information has a corresponding relationship with the UE.

Further, the ANDSF proxy unit 24 may be further configured to receive access network discovery information that is sent by the wireless control device in the access network, and the access network discovery information has a corresponding relationship with the UE; or

The ANDSF proxy unit 24 may be further configured to send an acquisition request to the wireless control device, and receive access network discovery information returned by the wireless control device according to the acquisition request, where the access network discovery information has a corresponding relationship with the UE.

Further, the access network device may further include: a service level protocol information acquiring unit 25 and an access unit 26, where the service level protocol information acquiring unit 25 is configured to use an ANDSF server or a policy rule function entity PRCF in the core network. The SLA information corresponding to the UE is obtained, where the SLA information includes the level information of the UE. The access unit 26 is configured to preferentially access the UE with the highest level in the level information of the UE to the target access network according to the level information of the UE. . It should be noted that the wireless control device in this embodiment may include one or a combination of the following devices, or the wireless control device integrates the functions of one or a combination of the following devices:

RNC/BTS, femto gateway (for example: HNB GW, or HeNB GW), Pico gateway (for example: enterprise HNB GW, HeNB GW), BBU, WiFi AC/TTG/PDG and WiMax ASN GW.

In this embodiment, when the network selection device is the access network device, the network selection policy information corresponding to the UE is obtained by the network in the access network device; and is found by the access network in the access network device. The information acquisition unit 22 acquires access network discovery information corresponding to the UE from the access network discovery information held by the ANDSF proxy unit 24. Then, the network selection unit 23 in the access network device selects an appropriate access network as the target access network of the UE according to the network selection policy information and the access network discovery information.

It should be noted that the network selection device of this embodiment can perform the technical solution of the method embodiment shown in FIG. 3, and the implementation principles are similar.

In the technical solution of the embodiment, after the access network device is powered on, the ANDSF proxy unit acquires the network selection policy information pre-configured in the ANDSF server, and obtains the access network discovery information from the wireless control device, when the UE is received and sent. When the request message is received, the access network device is triggered to obtain the network selection policy information and the access network discovery information corresponding to the UE from the ANDSF proxy unit, and then select an appropriate access according to the network selection policy information and the access network discovery information. The network acts as the target access network for the UE. Since the access network discovery information can be obtained from the wireless control device in the access network, the real-time performance of the access network information is ensured, thereby ensuring that the UE selects the appropriate target access network, thereby effectively improving the User experience. In addition, since the access network discovery information is obtained from the wireless control device in real time, the ANDSF server in the core network only needs to acquire the policy information, and does not need to acquire the access network discovery information, thereby effectively reducing the core network. The load of the ANDSF server.

It should be noted that, in another implementation of the present invention, on the basis of the foregoing embodiment shown in FIG. 5, the network selection device may be specifically a UE, and the network selection policy information acquiring unit 21 is specifically used for the secondary access network. Obtaining the UE in the network selection policy information saved in the ANDSF proxy unit in the device Corresponding network selection policy information, where the network selection policy information saved in the ANDSF proxy unit is obtained from an ANDSF server in the core network or configured in an ANDSF proxy unit.

In addition, the access network discovery information acquiring unit 22 is configured to obtain access network discovery information corresponding to the UE from the access network discovery information saved by the ANDSF proxy unit in the access network device.

It should be noted that the wireless control device in this embodiment may include one or a combination of the following devices, or the wireless control device integrates the functions of one or a combination of the following devices: RNC/BTS, Femto gateway (for example: HNB GW, or HeNB GW), Pico gateway (for example: enterprise HNB GW, HeNB GW), BBU, WiFi AC/TTG/PDG and WiMax ASN GW.

It should be noted that the network selection device of this embodiment can implement the technical solution of the method embodiment shown in FIG. 4, and the implementation principles are similar.

In the technical solution of the implementation, the UE obtains the network selection policy corresponding to the UE in the request message and the access network discovery information corresponding to the UE from the ANDSF proxy unit by using the request message sent to the access network device, and then Determining an appropriate access network as the target access network of the UE according to the network selection policy and the access network discovery information. The UE may obtain the access network discovery information from the ANDSF proxy unit when the UE sends the request message. The information is obtained from the wireless control unit. Therefore, the real-time information of the access network is ensured, thereby ensuring that the UE can switch to the appropriate access network, thereby effectively improving the user experience.

FIG. 7a and FIG. 7b are schematic diagrams showing the structure of an embodiment of a network selection system according to the present invention. As shown in FIG. 7a and FIG. 7b, the network selection system of this embodiment includes a network selection device 31 and a wireless control device 32, wherein the wireless control The device 32 is configured to acquire and maintain access network discovery information on the access network.

Specifically, in this embodiment, as shown in FIG. 7a, when the network selection device 31 is an access network device, the access network device may perform the technical solution of the embodiment shown in FIG. 3, and the principle is similar. I won't go into details here. In addition, the network selection system may further include a UE 33 and a core network device 34; wherein the core network device 34 is disposed in the core network, and the network selection device 31 and the wireless control device 32 are disposed in the access network.

As shown in FIG. 7b, when the network selection device 31 is a UE, the embodiment shown in FIG. 4 can be executed. The technical schemes are similar in principle and will not be described here. The network selection system further includes an access network device

35 and a core network device 34, wherein the core network device 34 is disposed in the core network, and the access network device 35 and the wireless control device 32 are disposed in the access network.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A network selection method, the method comprising:

Obtaining the network selection policy information corresponding to the user equipment UE from the network selection policy information saved by the access network discovery and selection function ANDSF proxy unit, where the network selection policy information includes the access network information that the UE can optimize;

And selecting, according to the network selection policy information and the access network discovery information, a suitable access network as the target access network of the UE.

The method according to claim 1, wherein before the ANDSF proxy unit saves the access network discovery information, the method further includes:

The ANDSF proxy unit receives the access network discovery information that is sent by the wireless control device in the access network, and the access network discovery information has a corresponding relationship with the UE; or

The ANDSF proxy unit sends an acquisition request to the wireless control device, and receives access network discovery information returned by the wireless control device according to the acquisition request, where the access network discovery information has a corresponding relationship with the UE.

The method according to claim 1 or 2, wherein before the ANDSF proxy unit saves the network selection policy information, the method further includes:

The ANDSF proxy unit acquires an Internet Protocol address of the ANDSF server in the core network, and acquires network selection policy information pre-configured in the ANDSF server corresponding to the Internet Protocol address, where the network selection policy information has a corresponding relationship with the UE; or ,

The ANDSF proxy unit locally pre-configures network selection policy information, where the network selection policy information has a corresponding relationship with the UE.

4. A method according to any one of claims 1 to 3, characterized in that

Obtaining a user equipment from the network selection policy information saved by the ANDSF proxy unit The network selection policy information corresponding to the UE is performed by the access network device;

And obtaining, by the access network discovery information saved by the ANDSF proxy unit, access network discovery information corresponding to the UE by the access network device:

The selecting the appropriate access network as the target access network of the UE according to the network selection policy information and the access network discovery information includes:

The access network device selects an appropriate access network as the target access network of the UE according to the network selection policy information and the access network discovery information.

5. A method according to any one of claims 1 to 3, characterized in that

And obtaining the network selection policy information corresponding to the user equipment UE from the network selection policy information saved by the ANDSF proxy unit, including:

Obtaining the network selection policy information corresponding to the UE from the network selection policy information saved by the ANDSF proxy unit in the access network device, where the network selection policy information saved in the ANDSF proxy unit is from the core network The ANDSF server is obtained or configured in the ANDSF proxy unit;

And obtaining the access network discovery information corresponding to the UE from the access network discovery information saved by the ANDSF proxy unit, including:

Obtaining, by the UE, the access network discovery information corresponding to the UE from the access network discovery information saved by the ANDSF proxy unit in the access network device;

The UE selects an appropriate access network as the target access network of the UE according to the network selection policy information and the access network discovery information.

The method according to any one of claims 1 to 4, further comprising: the access network device acquiring a service level agreement corresponding to the UE from an ANDSF server or a policy rule function entity in the core network. Information, where the service level agreement information includes level information of the UE; The access network device preferentially accesses the UE with the highest level in the level information of the UE to the target access network according to the level information of the UE.

The method according to any one of claims 1 to 6, wherein the wireless control device in the access network is configured to acquire and maintain the access network discovery information in the access network, and The wireless control device is one or a combination of the following devices, or the wireless access device integrates the functions of one or a combination of the following devices:

Radio network controller/base station controller, femto base station gateway, pico base station gateway, baseband processing unit, wireless fidelity access controller/tunnel termination gateway/packet data gateway, and global microwave access interoperability access service gateway .

8. A network selection device, comprising:

a network selection policy information acquiring unit, configured to obtain, from the network selection policy information saved by the access network discovery and selection function ANDSF proxy unit, network selection policy information corresponding to the user equipment UE, where the network selection policy information includes the UE Preferred access network information;

An access network discovery information acquiring unit, configured to obtain, from the access network discovery information saved by the ANDSF proxy unit, access network discovery information corresponding to the UE, where the access network discovery information is accessed from Obtained in a wireless control device in the network, where the access network discovery information is used for discovery and selection of the access network;

And a network selection unit, configured to select, according to the network selection policy information and the access network discovery information, a suitable access network as the target access network of the UE.

The network selection device according to claim 8, wherein the ANDSF proxy unit is disposed in an access network device,

The ANDSF proxy unit is configured to receive access network discovery information that is sent by the wireless control device in the access network, and the access network discovery information has a corresponding relationship with the UE; or

The ANDSF proxy unit is configured to send an acquisition request to the wireless control device, and receive access network discovery information returned by the wireless control device according to the acquisition request, where the access network discovery information has a corresponding relationship with the UE.

The network selection device according to claim 8 or 9, wherein the ANDSF proxy unit is disposed in an access network device,

The ANDSF proxy unit is configured to acquire an Internet Protocol address of an ANDSF server in the core network, and obtain pre-configured network selection policy information in the ANDSF server corresponding to the Internet Protocol address, where the network selection policy information has a corresponding relationship with the UE. Or,

The ANDSF proxy unit is configured to pre-configure network selection policy information locally, where the network selection policy information has a corresponding relationship with the UE.

The network selection device according to any one of claims 8 to 10, wherein the network selection device is an access network device, or the network selection device is a UE.

The network selection device according to claim 11, wherein when the network selection device is an access network device, the access network device further includes:

a service level agreement information obtaining unit, configured to obtain service level agreement information corresponding to the UE from an ANDSF server or a policy rule function entity in a core network, where the service level protocol information includes level information of the UE;

The access unit is configured to preferentially access the UE with the highest level in the level information of the UE to the target access network according to the level information of the UE.

The network selection device according to any one of claims 8 to 12, wherein the wireless control device is configured to acquire and maintain the access network discovery information in an access network, and the wireless control device Or one of the following devices, or the wireless access device integrates the functions of one or a combination of the following devices:

A network selection system, comprising: the network selection device according to any one of claims 8 to 13, and a wireless control device, wherein the wireless control device is used to acquire and maintain an access network. The access network discovery information.