WO2010099741A1

WO2010099741A1 - Network selection method, device and terminal

Info

Publication number: WO2010099741A1
Application number: PCT/CN2010/070836
Authority: WO
Inventors: 周青; 胡颖; 王珊珊; 吴问付
Original assignee: 华为技术有限公司
Priority date: 2009-03-04
Filing date: 2010-03-02
Publication date: 2010-09-10
Also published as: CN101827411A; CN101827411B

Abstract

The present invention relates to the field of communications technology. A network selection method, device and terminal are disclosed, wherein the network selection method includes the steps of: obtaining information on a mobility protocol supported by a target access network; obtaining a mobility protocol which is used by a terminal when the terminal performs handover to the target access network; determining whether a network re-selection is initiated to the target access network or not according to the information on the mobility protocol supported by the target access network and the mobility protocol which is used by the terminal when the terminal performs handover to the target access network.

Description

Network selection method, device and terminal

The present application claims the priority of the Chinese application filed on March 4, 2009, which is hereby incorporated by reference in its entirety in its entirety in its entirety in the the the the the the the the the

Technical field

The present invention relates to the field of communications technologies, and in particular, to a network selection method, apparatus, and terminal. Background technique

With the development of telecommunication technology, the mobile packet network is developed from the third generation mobile communication (3G) network to the evolved packet network (EPS: Evolved Packet System), and the core network of the mobile packet network is also controlled by the traditional second generation mobile communication (2G). And the General Packet Radio Service (GPRS) network in the 3G network is developed to the Evolved Packet Core (EPC), which can support the traditional 3rd Generation Partnership Project (3GPP) access technology (2G) Or 3G), integrated 3GPP access technology (Long Term Evolution), non-3GPP (non-3GPP) access technology, and multiple access technologies, where non-3GPP access technology includes code division multiple access ( CDMA: Code-Division Multiple Access) access, WiMax: Worldwide Interoperability for Microwave Access, and Wireless Fidelity (WiFi) access.

With the advent of dual-mode or multi-mode terminals (UEs), the terminal can access the EPC network through different access technologies. In order to realize network discovery and selection of multiple access technologies, network discovery and selection functions are introduced ( ANDSF: Access Network Discovery and Selection Function) The entity helps the terminal to make network selections.

An existing network selection method: After the ANDSF entity discovers that the terminal has entered the coverage of the target access network, if the target access network is determined to be the preferred network (that is, the network that preferentially accesses in the same case), the ANDSF entity will deliver the The policy (recommending the terminal to switch to the target access network or not recommending the terminal to switch to the target access network) to the terminal determines whether to switch to the target access network according to the policy.

In the study of the prior art, the inventors found that: since the terminal can access the network using different mobility protocols, the network can also use different mobility protocols, so when using the above network selection method, the terminal is under the ANDSF entity. The sent policy determines to switch to the target access network if The terminal does not support the mobility protocol used by the target access network, and the terminal cannot access the target access network.

Summary of the invention

The embodiment of the invention provides a network selection method, a device and a terminal. The technical solution provided by the embodiment of the present invention can determine whether to switch the terminal to the target access network.

The purpose of the embodiment of the present invention is achieved by the following technical solutions:

The embodiment of the invention provides a network selection method, including:

Obtaining information about the mobility protocol supported by the target access network;

Obtaining a mobility protocol used by the terminal when switching to the target access network;

And determining whether to initiate network reselection to the target access network according to the information of the mobility protocol supported by the target access network and the mobility protocol used by the terminal when switching to the target access network.

The embodiment of the invention further provides a network selection method, including:

Receiving a network discovery and selection policy from a network discovery and selection entity, the network discovery and selection policy including information of a mobility protocol supported by the target access network acquired by the network discovery and selection entity;

Determining whether to initiate network reselection to the target access network according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal.

And determining, according to the mobility protocol supported by the target access network and the mobility protocol used by the terminal in the current access network, whether to initiate network reselection to the target access network.

The embodiment of the invention further provides a network selection device, including:

An acquiring unit, configured to acquire information about a mobility protocol supported by the target access network; acquire a mobility protocol used by the terminal when switching to the target access network;

a determining unit, configured to determine, according to information about a mobility protocol supported by the target access network acquired by the acquiring unit, and a mobility protocol used by the terminal when switching to the target access network, Initiating network reselection to the target access network.

The embodiment of the invention further provides a terminal, including:

a receiving unit, configured to receive a network discovery and selection policy, where the network discovery and selection policy includes information about a mobility protocol supported by the target access network;

And a determining unit, configured to determine whether to initiate network reselection to the target access network according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal received by the receiving unit.

The embodiment of the invention further provides a terminal, including:

And a determining unit, configured to determine, according to the mobility protocol supported by the target access network received by the receiving unit, and the mobility protocol used by the terminal in the current access network, whether to initiate network reselection to the target access network.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only 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.

FIG. 1 is a structural diagram of a network architecture according to an embodiment of the present invention;

2 is a flowchart of Embodiment 1 of a network selection method according to an embodiment of the present invention;

3 is a flowchart of Embodiment 2 of a network selection method according to an embodiment of the present invention;

4 is a flowchart of Embodiment 3 of a network selection method according to an embodiment of the present invention;

FIG. 5 is a signaling flowchart of Embodiment 4 of a network selection method according to an embodiment of the present invention;

6 is a signaling flowchart of Embodiment 5 of a network selection method according to an embodiment of the present invention;

FIG. 7 is a signaling flowchart of Embodiment 6 of a network selection method according to an embodiment of the present invention;

FIG. 8 is a signaling flowchart of Embodiment 7 of a network selection method according to an embodiment of the present invention;

FIG. 9 is a signaling flowchart of Embodiment 8 of a network selection method according to an embodiment of the present invention;

FIG. 10 is a structural diagram of Embodiment 1 of a network selection apparatus according to an embodiment of the present invention;

FIG. 11 is a structural diagram of Embodiment 2 of a network selection apparatus according to an embodiment of the present invention; FIG. 12 is a structural diagram of Embodiment 1 of a terminal according to an embodiment of the present invention;

FIG. 13 is a structural diagram of Embodiment 2 of a terminal according to an embodiment of the present invention;

FIG. 14 is a structural diagram of Embodiment 3 of a terminal according to an embodiment of 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 obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the present invention provides a network selection method, a device, and a terminal. First, the network architecture involved in the technical solution provided by the embodiment of the present invention is introduced. FIG. 1 describes the structure of the network architecture, including: The terminal 101 accesses the current access. The network 102, because the terminal 101 can access the EPC network through different access technologies, the number of the current access networks 102 may be multiple;

The access anchor 103 is an anchor point when the terminal switches between different access networks; the access anchor may be a packet data gateway (PGW: PDN GW) in the EPC network;

The target access network 104 is an access network that the terminal 101 is not currently accessing. Since there are multiple networks in the real environment, there may be multiple target access networks.

The current access network 102 and the target access network 104 include, in addition to the access network, other network elements that each access network accesses to the access anchor, and the other network elements may be connected to the access network. Incoming gateway, such as a serving gateway (SGW) in an EPC network, an evolved packet data gateway (ePDG), etc.;

The network discovery and selection function entity 105 is a functional entity that performs network discovery and selection functions, and may be an ANDSF entity in an EPC network;

An E1 interface may exist between the network discovery and selection function entity 105 and the terminal 101. The E1 interface may be an S 14 interface in the 3GPP architecture, and the network discovery and selection function entity 105 may send the network discovery and selection policy to the terminal through the E1 interface. 101 ;

An interface E2 may exist between the network discovery and selection function entity 105 and the terminal 101, the access anchor 103, the current access network 102, or the target access network 104, and the network discovery and selection function entity 105 may acquire mobility through the E2 interface. Information about the agreement.

Further, the network architecture applied by the embodiment of the present invention may further include a policy control function entity. An E2 interface may exist between the network discovery and selection function entity and the policy control function entity, and the network discovery and selection function entity may also obtain the mobility protocol information from the policy control function (PCRF) entity through the E2 interface.

The network architecture used in the embodiment of the present invention is as described above. The technical solution provided by the embodiment of the present invention is introduced as follows. The network selection method provided by the embodiment of the present invention is first introduced. FIG. 2 depicts the flow of the first embodiment of the network selection method, including :

201. Obtain information about a mobility protocol supported by the target access network.

After the terminal enters the coverage of the target access network, the terminal may need to switch to the target access network, so the ANDSF entity may obtain information about the mobility protocol supported by the target access network;

In the embodiment of the present invention, the ANDSF entity obtains the information about the mobility protocol supported by the target access network, and the following two methods are mainly used:

(1) acquiring information about a mobility protocol supported by the target access network according to the configuration information;

(2) obtaining, from the access gateway control unit of the target access network, information about the mobility protocol supported by the target access network; specifically, the information may be directly obtained from the access gateway control unit of the target access network, or may be controlled by a policy. The functional entity is obtained from the access gateway control unit of the target access network.

202. Acquire a mobility protocol used by the terminal when switching to the target access network.

The mobility protocol used by the terminal when switching to the target access network may be as follows: 1. The mobility protocol used by the terminal in the current access network.

The mobility protocol used by the terminal in the current access network is used as the mobility protocol used by the terminal when switching to the target access network, and the mobility protocol cannot be switched, thereby ensuring the mobility used in the current access network. The business carried out by the agreement can maintain continuity.

The information about the mobility protocol used by the terminal to access the network is mainly obtained through the access anchor of the terminal access, and the access anchor is the PGW. The two methods are as follows:

(1) Obtaining the information of the mobility protocol currently used by the access network from the PGW; specifically, the information of the mobility protocol currently used by the access network may be directly reported by the PGW to the ANDSF entity; the PGW may actively send the ANDSF entity to the ANDSF entity. The information about the mobility protocol used by the current access network may be reported, and after receiving the trigger message sent by the ANDSF entity, the information about the mobility protocol currently used by the access network may be reported to the ANDSF entity; PGW and ANDSF The body communicates through the E2 interface;

The E2 interface protocol may be a Diameter protocol. In order to transmit the information of the mobility protocol used by the terminal in the current access network in the Diameter protocol, a new Diameter protocol message may be used, and the new Diameter protocol message may be a mobility protocol. Reporting the message; the existing Diameter protocol message may also be extended to transmit the information of the mobility protocol used by the terminal in the current access network;

In order to transmit the mobility protocol information in the Diameter protocol, a mobility protocol attribute value pair (AVP: AttributeValuePair) may be carried in the new message or the extended existing message, such as a mobile protocol type (MobileProtocolType) AVP, and the value is The enumeration value may be selected from protocols such as Proxy Mobile IP Protocol Version 6 (PMIPv6), Mobile Internet Protocol Version 4 (MIPv4), Dual Stack Mobile IP Protocol Version 6 (DSMIPv6), and General Packet Radio Service Tunneling Protocol (GTP). ;

(2) obtaining, by the policy control function entity, information of the mobility protocol used by the terminal in the current access network from the PGW;

Specifically, the PGW may use the existing Gx interface of the 3GPP to transmit the information of the mobility protocol used by the terminal in the current access network to the PCRF entity, and the PGW may use the current IP address in the existing Gx interface. The mobility protocol is passed to the PCRF entity; then the PCRF entity can send the mobility protocol information used by the terminal in the current access network to the ANDSF entity through the E2 interface.

2. The mobility protocol supported by both the terminal and the access anchor;

In order to obtain the mobility protocol supported by the terminal and the access anchor, it is required to obtain the information of the mobility protocol supported by the terminal; obtain the information of the mobility protocol supported by the access anchor; and use the information and connection of the mobility protocol supported by the terminal. The intersection of the letters of the mobility protocol supported by the anchor point serves as a mobility protocol supported by both the terminal and the access anchor.

The information about obtaining the mobility protocol supported by the terminal can be performed as follows:

(1) Obtaining the information of the mobility protocol supported by the terminal according to the configured method, for example, accessing the user subscription database, and acquiring the mobility protocol information supported by the terminal from the user subscription database;

(2) Obtaining information about the mobility protocol supported by the terminal from the terminal. Specifically, the terminal may connect the information about the mobility protocol supported by the terminal through the E2 interface when connecting to the ANDSF entity. Notifying the ANDSF entity;

The E2 interface protocol herein may be an Open Mobile Alliance Device Management (OMA DM) protocol. To transmit the above mobility protocol information in the OMA DM protocol, an OMA DM management object (MO: Management Object) may be carried in the OMA DM protocol. For example, the mobile protocol type list (MobileProtocolTypeList) MO, the value is one or more MobileProtocolType, and the value of the MobileProtocolType is an enumeration value, which can be selected from protocols such as PMIPv6, MIPv4, DSMIPv6, and GTP.

Obtaining the information of the mobility protocol supported by the access anchor can be performed as follows:

(1) Obtaining the information of the mobility protocol supported by the access anchor according to the configured method. Specifically, the ANDSF entity may configure the protocol type that the network access anchor can support, so as to obtain the mobility supported by the access anchor. Information of the agreement;

(2) obtaining information about the mobility protocol supported by the access anchor from the access anchor, and the access anchor may notify the ANDSF entity of the information about the mobility protocol supported by the access anchor through the E2 interface;

The E2 interface protocol herein may be a Diameter protocol. In order to pass information about the mobility protocol supported by the access anchor in the Diameter protocol, a pair of new messages may be used, assuming that the mobility protocol capability queries/reports the message; Sending a mobility protocol capability query message to query the information of the mobility protocol supported by the access anchor, and the access anchor reports the information of the mobility protocol supported by the access anchor to the ANDSF entity by using the mobility protocol capability to report the message;

In order to transmit the information of the mobility protocol supported by the access anchor in the Diameter protocol, the mobility protocol capability report message may carry a mobility protocol list AVP, such as a MobileProtocolTypeList AVP, and the value is one or more MobileProtocolType, MobileProtocolType The value is an enumeration value, which can be selected from protocols such as PMIPv6, MIPv4, DSMIPv6, and GTP.

3. The mobility protocol supported by the terminal;

In practical applications, since the access anchor can usually support all mobility protocols, the mobility protocol supported by the terminal can also be used as the mobility protocol used by the terminal when switching to the target access network.

The method for obtaining the information of the mobility protocol supported by the terminal is the same as 2;

4. Access mobility protocol supported by the anchor. In some specific cases, such as the inability to obtain the mobility protocol supported by the terminal, the mobility protocol supported by the access anchor may also be used as the mobility protocol used by the terminal when switching to the target access network.

The method for obtaining the information of the mobility protocol supported by the anchor is the same as 2;

203. Determine, according to the information about the mobility protocol supported by the target access network, and the mobility protocol used by the terminal when switching to the target access network, whether to initiate network reselection to the target access network.

Specifically, when the mobility protocol supported by the target access network includes a mobility protocol used by the terminal when switching to the target access network, the mobility protocol used by the terminal when switching to the target access network is used, and the target access is used. The network initiates a network reselection.

When the mobility protocol supported by the target access network does not include the mobility protocol used by the terminal when switching to the target access network, network reselection is not initiated to the target access network.

Wherein, if the terminal uses at least two mobility protocols when switching to the target access network, and the mobility protocol supported by the target access network includes only one mobility of the at least two mobility protocols. The protocol directly initiates network reselection to the target access network using the one mobility protocol.

If the number of mobility protocols used by the terminal when switching to the target access network is at least two, and the mobility protocol supported by the target access network includes at least two of the at least two mobility protocols, then Selecting, by the at least two terminals included in the mobility protocol supported by the target access network, a mobility protocol selected from the mobility protocols used when switching to the target access network, and then using the selected one mobility protocol to initiate the target access network Network reselection; wherein, selecting a mobility protocol from at least two mobility protocols, a mobility protocol may also be selected from at least two mobility protocols according to a user's preference or an operator's preference.

The process of initiating network reselection to the target access network may be a direct initiation of a handover procedure for handover of the terminal from the current access network to the target access network.

The process of initiating network reselection to the target access network may also be a policy of delivering a policy to the terminal, where the policy includes the target access network information, and the terminal initiates a handover process of switching to the target access network according to the target access network information; The mobile mobility protocol information may be further included, and the terminal determines, according to the mobility protocol information, whether to initiate the handover;

The process of not performing network reselection to the target access network may end the current process; Slightly the terminal, the policy includes the target access network information and the mobility protocol information supported by the target network, and the terminal does not initiate the handover process according to the foregoing information;

In this embodiment, the execution of 201 and 202 has no sequential relationship;

As can be seen from the above, the mobility protocol supported by the target access network can be obtained in this embodiment, and the mobility protocol used by the terminal when switching to the target access network can be acquired, so that the mobility protocol supported by the target access network can be obtained. The information and the mobility protocol used by the terminal when switching to the target access network determine whether to initiate network reselection to the target access network, which can prevent the terminal from directly accessing the target access network and cannot access the target access network, thereby improving User experience.

FIG. 3 is a flowchart of a second embodiment of a network selection method according to an embodiment of the present invention. The embodiment describes a process flow of the terminal, including:

301: Receive a network discovery and selection policy from a network discovery and selection entity, where the network discovery and selection policy includes information about a mobility protocol supported by the target access network acquired by the network discovery and selection entity;

302. Determine, according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal, whether to initiate network reselection to the target access network.

Specifically, if the mobility protocol supported by the target access network includes the mobility protocol supported by the terminal, the mobility protocol included in the mobility protocol supported by the target access network is used, and the mobility protocol supported by the terminal initiates network reselection to the target access network. .

If the mobility protocol supported by the target access network does not include the mobility protocol supported by the terminal, network reselection is not initiated to the target access network.

Wherein, if the mobility protocol supported by the target access network includes at least two mobility protocols supported by the terminal, the mobility protocol supported by the target access network is used, and the mobility protocol supported by the terminal is targeted to the target. The step of initiating network reselection by the access network includes: selecting one mobility protocol from at least two mobility protocols included in the mobility protocol supported by the target access network and supported by the terminal, using the selected one mobility protocol to the target The access network initiates network reselection; specifically, one of the two mobility protocols may be randomly selected, or one of the at least two mobility protocols may be selected according to the preference of the user.

As can be seen from the above, the mobility protocol supported by the target access network can be obtained in this embodiment, and can be determined according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal. Whether the network reselection is initiated to the target access network, so that the terminal can not access the target access network when directly switching to the target access network, which can improve the user experience.

FIG. 4 is a flowchart of a third embodiment of a network selection method according to an embodiment of the present invention. The embodiment describes a process flow of the terminal, including:

401. Receive a network discovery and selection policy from a network discovery and selection entity, where the network discovery and selection policy includes information about a mobility protocol supported by the target access network acquired by the network discovery and selection entity;

402. Determine, according to a mobility protocol supported by the target access network, and a mobility protocol used by the terminal in the current access network, whether to initiate network reselection to the target access network.

Specifically, if the mobility protocol supported by the target access network includes a mobility protocol used by the terminal in the current access network, the mobility protocol used by the terminal in the current access network initiates network reselection to the target access network.

If the mobility protocol supported by the target access network does not include the mobility protocol used by the terminal in the current access network, the network reselection is not initiated to the target access network;

As can be seen from the above, this embodiment can obtain the mobility protocol supported by the target access network, and determine whether to access the target according to the mobility protocol supported by the target access network and the mobility protocol used by the terminal in the current access network. The network reselection is initiated, so that the terminal can be prevented from accessing the target access network when directly switching to the target access network, thereby improving the user experience.

5 is a signaling flow of a fourth embodiment of a network selection method according to an embodiment of the present invention. In this embodiment, a multimode terminal used by a user supports 3GPP access and trusted non-3GPP access (trusted non-3GPP access). And untrusted non-3GPP access access, wherein the trusted non-3GPP access network may be a WiMax network, the untrusted non-3GPP access network may be a WiFi network; the WiFi network is a presence service Preferred network in the case. The access network currently accessed by the terminal is a WiMax network, and the mobility protocol used is MIPv4.

501. The UE accesses the EPC through the access gateway of the WiMax network, and performs the service through the WiMax network; the mobility protocol used by the UE in the WiMax network is MIPv4;

502. The ANDSF entity acquires the mobility protocol information used by the UE in the WiMax network. In the embodiment of the present invention, the ANDSF entity acquires the mobility protocol used by the UE in the WiMax network. Information can be used as follows:

(1) The PGW directly reports to the ANDSF entity, and the PGW can send the mobility protocol information used by the UE on the WiMax network to the ANDSF entity through the E2 interface;

The PGW may send the UE identifier to the ANDSF entity in addition to the mobility protocol used by the UE in the WiMax network.

(2) The PGW reports the mobility protocol information used by the UE in the WiMax network to the ANDSF entity through the PCRF entity; the PGW can use the existing Gx interface of the 3GPP to transmit the mobility protocol used by the UE in the WiMax network to the PCRF entity, and the PCRF entity Notifying the ANDSF entity of the mobility protocol information used by the UE on the WiMax network through the E2 interface;

The PGW may transmit the mobility protocol used by the UE in the WiMax network to the PCRF entity in the IP^ tongue establishment message of the existing Gx interface;

The PCRF entity may report the UE identifier to the ANDSF entity in addition to the current mobility protocol.

In this embodiment, since the mobility protocol used by the UE in the WiMax network is MIPv4, the ANDSF entity can acquire from the PGW that the mobility protocol used by the UE in the WiMax network is MIPv4.

In addition to the mobility protocol information used by the UE in the WiMax network, the ANDSF entity may further acquire the capability of the UE to use the service information of the WiMax network and/or the access anchor to switch between different protocol protocols. The access anchor point is PGW;

The ANDSF entity may obtain the information used by the UE in the WiMax network from the PCRF entity or the AF through the E2 interface, and the service information may include a QoS (Quality of Service) level, a bandwidth, and the like;

The ANDSF entity can obtain the capability of the PGW to switch between different protocol protocols through the configuration method; the ANDSF entity can also obtain the capability of the PGW to switch between different protocol protocols through the E2 interface; wherein, the E2 interface protocol can Adopt the Diameter protocol.

503. The UE moves to a hotspot area covered by the WiFi network;

Specifically, the ANDSF entity may confirm that the UE enters a hotspot area covered by the WiFi network according to the location information of the UE. Since the WiFi network is a preferred network, the ANDSF entity needs to confirm whether to initiate network reselection to the WiFi network; the location information of the UE may be Reported by the UE, or other network elements such as PGW; 504. The ANDSF entity obtains mobility protocol information supported by the WiFi network.

In the embodiment of the present invention, the ANDSF entity may obtain the mobility protocol information supported by the target access network (the WiFi network in this embodiment) by:

(1) Obtained according to the configured method; in this embodiment, the WiFi network is an untrusted non-3GPP access network, and the UE is in an untrusted non-3GPP access network, and can only pass two protocols: ΡΜΙΡνό and DSMIPv6. Access to the EPC, therefore, the protocol information supported by the target WiFi network is PMIPv6 and DSMIPv6;

(2) The access gateway control unit of the target access network sends the mobility protocol information supported by the target access network to the ANDSF entity through the E2 interface;

The access gateway control unit of the target access network is different according to the target access network, and may be, for example, an ePDG, an SGW, or an access gateway in a non-3GPP network; The control unit can be an ePDG.

The E2 interface protocol may be a Diameter protocol. In order to transmit the above mobility protocol information in the Diameter protocol, a pair of new messages may be used, assuming that the mobility protocol capability queries/reports the message; and the ANDSF entity sends the mobility protocol capability query message to query. The access gateway control unit reports the mobility protocol information used by the target access network to the ANDSF entity by using the mobility protocol capability to report the message.

In order to transmit the mobility protocol information supported by the target access network in the Diameter protocol, the mobility protocol capability report message may carry a mobility protocol list AVP, such as a MobileProtocolTypeList AVP, which is a value of one or more MobileProtocolTypes, and a MobileProtocolType. The value is an enumeration value, which can be selected from protocols such as PMIPv6, MIPv4, DSMIPv6, and GTP. In this embodiment, the ePDG reports the PMIPv6 and the DSMIPv6 to the ANDSF entity.

As DSMIPv6 does not need to be directly supported by the network control unit, DSMIPv6 can be used as the mobility protocol supported by the target access network by default.

(3) The access gateway control unit of the target access network may also report the information of the mobility protocol supported by the target access network to the ANDSF entity through the PCRF entity. The access gateway control unit of the target access network may use the interface between the existing 3GPP and the PCRF entity to transmit the mobility protocol information supported by the target access network to the PCRF entity, and the PCRF entity may use the E2 interface to view the network. The mobility protocol information supported by the standard access network notifies the ANDSF entity.

In this embodiment, the ANDSF entity can obtain the mobility protocol information supported by the WiFi network as ΡΜΙΡνό and DSMIPv6.

505. Since the WiFi network does not support MIPv4, the ANDSF entity decides not to initiate network reselection to the WiFi network.

The ANDSF entity obtains the mobility protocol used by the terminal when accessing the target access network according to the currently used mobility protocol is MIPv4; since the target access network WiFi network does not support MIPv4, the network reselection is not initiated to the WiFi network. .

It can be understood that the execution of 502 only before 505 does not affect the implementation of this embodiment.

The ANDSF entity may also determine whether to initiate network reselection to the WiFi network according to the service information used by the UE in the WiMax network or the ability of the access anchor to switch between different protocol protocols, for example, the UE does not currently have a service on the WiMax network, or The currently used service allows for loss of service caused by different mobility protocols, and the mobility protocol used by the UE when switching to the WiFi network may not be the protocol used by the UE in the WiMax network. If the access anchor does not support switching between different protocol protocols, the mobility protocol used by the UE when switching to the WiFi network can only be the protocol used by the UE in the WiMax network. This embodiment assumes that the access anchor does not support the handover of the mobility protocol, or the service used by the UE in the WiMax network does not support the handover of the mobility protocol, so that the mobility protocol supported by the WiFi network only includes the MIPv4. Initiate a network reselection.

The ANDSF entity may initiate a network reselection to the WiFi network without determining the mobility protocol information supported by the WiFi network, and send the network discovery and selection policy to the UE, where the network discovery and selection policy includes the target access network information, and the target The access network information may be a Service Set Identifier (SSID) of the WiFi network, and the mobility protocol information supported by the WiFi network. In this embodiment, the protocol type supported by the WiFi network, namely, PMIPv6 and DSMIPv6; According to the information included in the network discovery and selection policy, it may be determined that the network reselection is not initiated to the WiFi network, that is, the handover process is not performed. The ANDSF entity can send the network discovery and selection policy to the UE through the S14 interface.

As can be seen from the above, this embodiment can obtain the mobility protocol supported by the WiFi network, and can determine that the network does not initiate network reselection to the WiFi network according to the mobility protocol used by the terminal in the WiMax network, thereby avoiding the terminal switching to the WiFi network. Can not access the WiFi network, can improve user experience.

FIG. 6 is a schematic diagram of a signaling procedure of Embodiment 5 of a network selection method according to an embodiment of the present invention. In this embodiment, the user uses a multimode terminal to support access of 3GPP, trusted non-3GPP access (WiMax network) and untrusted non-3GPP access (WiFi network); the WiFi network is a preferred network in the presence of a service, and the terminal is currently connected. To enter the WiMax network for service, the mobility protocol used in the WiMax network is PMIPv6.

601. The UE accesses the EPC through the access gateway of the WiMax network, and performs the service through the WiMax network; the mobility protocol used by the UE in the WiMax network is ΡΜΙΡνό;

602. The ANDSF entity acquires mobility protocol information used by the UE in the WiMax network. In this embodiment, the mobility protocol used by the ANDSF entity to acquire the UE in the WiMax network is PMIPv6.

603. The UE moves to a hotspot area covered by the WiFi network.

Refer to 503 for execution.

604. The ANDSF entity obtains mobility protocol information supported by the WiFi network.

Refer to 504 for execution. In this embodiment, the mobility protocol supported by the ANDSF entity to obtain the WiFi network is ΡΜΙΡνό and DSMIPv6;

605. Since the WiFi network supports PMIPv6, the ANDSF entity determines to initiate network reselection to the WiFi network.

The process of initiating network reselection to the WiFi network may be a direct initiation of a handover procedure for switching the UE from the WiMax network to the WiFi network.

It can be understood that the execution of 602 only before 605 will not affect the implementation of this embodiment. The ANDSF entity may initiate a network reselection to the WiFi network without determining the mobility protocol information supported by the WiFi network, and send the network discovery and selection policy to the UE, where the network discovery and selection policy includes the target access network information (eg, The SSID of the WiFi network, and the mobility protocol information supported by the WiFi network, in this embodiment, the protocol types supported by the WiFi network, namely, PMIPv6 and DSMIPv6; the terminal can determine the WiFi according to the information included in the network discovery and selection policy. The network initiates a network reselection, that is, performs a handover process. The ANDSF entity can send the network discovery and selection policy to the UE through the S14 interface.

As can be seen from the above, the embodiment can obtain the mobility protocol supported by the WiFi network, and can determine that the network reselection is initiated to the WiFi network according to the mobility protocol used by the terminal in the WiMax network, so that the terminal can successfully switch to the preferred WiFi. The network can improve the user experience. FIG. 7 is a schematic diagram of a signaling procedure of Embodiment 6 of a network selection method according to an embodiment of the present invention. In this embodiment, a user uses a multimode terminal, supports 3GPP, trusted non-3GPP access (WiMax network), and untrusted non-3GPP access. (WiFi network) access; 3GPP network is the preferred network in the presence of traffic, the terminal currently accesses the WiFi network for service, and the mobility protocol used in the WiFi network is PMIPv6.

701. The UE accesses the EPC through the access gateway ePDG of the WiFi network, and performs the service through the WiFi network; the mobility protocol used by the UE in the WiFi network is PMIPv6;

702. The ANDSF entity acquires mobility protocol information used by the UE in the WiFi network. In this embodiment, the mobility protocol used by the ANDSF entity to acquire the UE in the WiFi network is PMIPv6;

703. The UE moves to an area covered by the 3GPP.

Specifically, the ANDSF entity may determine that the UE enters a 3GPP coverage area according to the location information of the UE. Since the 3GPP network is the preferred network, the ANDSF entity needs to confirm whether to initiate network reselection to the 3GPP network; the location information of the UE may pass through the UE. Escalation, or other network elements such as PGW reporting;

704. The ANDSF entity acquires mobility protocol information supported by the target 3GPP network; and performs 504. In this embodiment, the access gateway control unit of the target access network is the SGW; the mobility protocol supported by the ANDSF entity to obtain the 3GPP network is PMIPv6, GTP;

705. The ANDSF entity initiates network reselection to the 3GPP network according to the mobility protocol information supported by the target 3GPP network.

Since the 3GPP network supports PMIPv6, the ANDSF entity can initiate network reselection to the 3GPP network.

The ANDSF entity may directly initiate network reselection to the 3GPP network after obtaining the mobility protocol information supported by the WiFi network, and send the network discovery and selection policy to the UE, where the network discovery and selection policy includes 3GPP network information and 3GPP network support. Mobility protocol information, where 3GPP network information includes a 3GPP network type, and the 3GPP network type may be a mobile country code (MCC), a mobile network code (MNC), an access point name (APN), etc.; 3GPP network support in this embodiment The mobility protocol includes PMIPv6, GTP; the terminal can determine to initiate network reselection to the 3GPP network according to the information contained in the network discovery and selection policy. As can be seen from the above, this embodiment can obtain the mobility protocol supported by the 3GPP network, and can determine that the network reselection is initiated to the 3GPP network according to the mobility protocol used by the terminal in the WiFi network, so that the terminal can successfully switch to the preferred 3GPP. The network can improve the user experience.

FIG. 8 is a schematic diagram of a signaling procedure of Embodiment 7 of a network selection method according to an embodiment of the present invention. In this embodiment, a user uses a multimode terminal, supports 3GPP, trusted non-3GPP access (WiMax network), and untrusted non-3GPP access. (WiFi network) access, the terminal supports ΡΜΙΡνό; WiMax network is the preferred network in the presence of traffic, the terminal currently accesses the WiFi network for service, and the mobility protocol used in the WiFi network is PMIPv6.

801. The UE accesses the EPC through the access gateway ePDG of the WiFi network, and the mobility protocol used by the UE in the WiFi network is ΡΜΙΡνό;

802. The ANDSF entity acquires mobility protocol information supported by the UE.

In the embodiment of the present invention, the ANDSF entity may obtain the mobility protocol information supported by the UE by:

(1) Obtaining according to the static configuration method, for example, the ANDSF entity can access the user subscription database, and obtain the mobility protocol information supported by the UE from the user subscription database;

(2) The UE notifies the ANDSF entity of the mobility protocol information supported by the UE through the E2 interface; the UE may notify the ANDSF entity of the mobility protocol information supported by the UE through the E2 interface when connecting to the ANDSF entity;

The E2 interface protocol may be an OMA DM protocol. To transmit the above mobility protocol information in the OMA DM protocol, an OMA DM MO may be carried in the OMA DM protocol, such as a MobileProtocolTypeList MO, and the value is one or more MobileProtocolType, MobileProtocolType. The value is an enumeration value, which can be selected from protocols such as PMIPv6, MIPv4, DSMIPv6, and GTP;

In this embodiment, the ANDSF entity can obtain the mobility protocol information supported by the UE, which is PMIPv6e.

Since PMIPv6 does not require the direct participation of the UE, in practical applications, ΡΜΙΡνό can be used as the mobility protocol supported by the UE by default, and the ANDSF entity can directly obtain the mobility protocol supported by the UE as PMIPv6.

803. The ANDSF entity obtains the mobility protocol information supported by the access anchor, and is connected in this embodiment. The anchor point is the PGW;

In the embodiment of the present invention, the ANDSF entity may obtain the mobility protocol information supported by the PGW by:

(1) Obtaining according to a static configuration method, for example, the ANDSF entity can configure a mobility protocol that the network PGW can support;

(2) The PGW sends the mobility protocol information supported by the PGW to the ANDSF entity through the E2 interface;

The E2 interface protocol may be a Diameter protocol. In order to transmit the mobility protocol information in the Diameter protocol, a pair of new messages may be used, assuming a mobility protocol capability query/upper message; and an ANDSF entity sending a mobility protocol capability. The query message is queried, and the PGW reports the mobility protocol information supported by the PGW to the ANDSF entity by using the mobility protocol capability to report the message;

In order to transmit the mobility protocol information supported by the access anchor in the Diameter protocol, the mobility protocol capability report message may carry a mobility protocol list AVP, such as a MobileProtocolTypeList AVP, and the value is one or more MobileProtocolType, MobileProtocolType. The value is an enumeration value, which can be selected from protocols such as PMIPv6, MIPv4, DSMIPv6, and GTP;

In this embodiment, the mobility protocol information that the ANDSF entity can obtain the PGW support is ΡΜΙΡνό and DSMIPv6;

804. The UE moves to an area covered by the WiMax network;

The ANDSF entity may determine that the UE enters an area covered by a WiMax network according to the location information of the UE. Since the WiMax network is a preferred network, the ANDSF entity may determine whether to initiate network reselection to the WiMax network; the location information of the UE may be reported by the UE. Or other network elements such as PGW reporting;

805. The ANDSF entity obtains mobility protocol information supported by the WiMax network.

Refer to 504 for execution. In this embodiment, the access gateway control unit of the target access network is an access gateway in the WiMax network;

In this embodiment, the mobility protocol supported by the ANDSF entity to obtain the target WiMax network is DSMIPv6; 806. Since the UE only supports ΡΜΙΡνό, the target WiMax network only supports DSMIPv6, and the ANDSF entity does not initiate network reselection to the WiMax network;

The ANDSF entity obtains the mobility protocol used by the terminal to switch to the WiMax network according to the mobility protocol PMIPv6 supported by the UE, the mobility protocols PMIPv6 and DSMIPv6 supported by the PGW, and does not support the WiMax network because the WiMax network does not support the ΡΜΙΡν6. Network reselection.

Among them, 802 and 803 are not in the order of execution, and only need to perform both 802 and 803 before 806 will not affect the implementation of this embodiment.

The ANDSF entity may directly initiate network reselection to the WiMax network after obtaining the mobility protocol information supported by the WiMax network, and send the network discovery and selection policy to the UE, where the network discovery and selection policy includes WiMax network information (such as a WiMax network). The identity of the mobile protocol information supported by the WiMax network (DSMIPv6); the terminal can determine not to initiate network reselection to the WiMax network based on the information contained in the network discovery and selection policy.

As can be seen from the above, the mobility protocol supported by the terminal and the access anchor can be obtained in this embodiment, so as to obtain the mobility protocol used when the terminal switches to the WiMax network, and the non-WiMax network can be determined according to the mobility protocol supported by the WiMax network. Initiating network reselection, thereby preventing the terminal from accessing the WiMax network when switching to the WiMax network, can improve the user experience.

9 is a signaling flow of Embodiment 8 of a network selection method according to an embodiment of the present invention. In this embodiment, a user uses a multimode terminal, supports 3GPP, trusted non-3GPP access (WiMax network), and untrusted non-3GPP access. (WiFi network) access, the terminal supports PMIPv6 and DSMIPv6; WiMax network is the preferred network in the presence of traffic, the terminal currently accesses the WiFi network for service, and the mobility protocol used in the WiFi network is PMIPv6.

901. The UE accesses the EPC through the access gateway ePDG of the WiFi network, and the mobility protocol used by the UE in the WiMax network is ΡΜΙΡνό;

902. The ANDSF entity acquires mobility protocol information supported by the UE.

Refer to 802 for execution. In this embodiment, the ANDSF entity may obtain the mobility protocol information supported by the UE, which is PMIPv6 and DSMIPv6;

903. The ANDSF entity obtains the mobility protocol information supported by the access anchor. In this embodiment, the access anchor point is a PGW. Refer to 803 for execution. In this embodiment, the mobility protocol information supported by the ANDSF entity to obtain the PGW is PMIPv6 and DSMIPv6;

904. The UE moves to an area covered by the WiMax network;

Refer to 804 for execution.

905. The ANDSF entity acquires mobility protocol information supported by the target WiMax network; and performs the reference 805. In this embodiment, the mobility protocol information supported by the ANDSF entity to obtain the WiMax network is DSMIPv6;

906. The network reselection is initiated to the WiMax network because the WiMax network supports DSMIPv6.

The ANDSF entity according to the mobility protocols PMIPv6 and DSMIPv6 supported by the UE, the mobility protocols ΡΜΙΡνό and DSMIPv6 supported by the PGW, and the list of mobility protocols that can be used when the terminal switches to the WiMax network includes PMIPv6 and DSMIPv6, since the WiMax network supports DSMIPv6, Network reselection is initiated to the WiMax network using DSMIPv6.

Further, the ANDSF entity may also select a mobility protocol used by the terminal to switch to the WiMax network according to the preference of the operator or the user, where the ANDSF entity can obtain the operation through the configured method. The preferred mobility protocol of the quotient; the ANDSF entity can obtain the preference of the user through a configured method, and can also obtain the preference of the user from the UE.

The ANDSF entity may directly initiate network reselection to the WiMax network after obtaining the mobility protocol information supported by the WiMax network, and send the network discovery and selection policy to the UE, where the network discovery and selection policy includes WiMax network information (such as a WiMax network). The identity of the mobile protocol information supported by the WiMax network (DSMIPv6); the terminal can determine to initiate network reselection to the WiMax network using DSMIPv6 according to the information contained in the network discovery and selection policy.

As can be seen from the above, this embodiment can obtain the mobility protocol supported by the terminal and the access anchor point, thereby acquiring the mobility protocol used when the terminal switches to the WiMax network, and can determine to initiate the transmission to the WiMax network according to the mobility protocol supported by the WiMax network. The network reselects, so that the terminal can successfully switch to the preferred WiMax network, which can improve the user experience.

The network selection device provided by the embodiment of the present invention is further introduced. FIG. 10 is a diagram showing the structure of the first embodiment of the network selection device, including:

The acquiring unit 1001 is configured to acquire information about a mobility protocol supported by the target access network, and acquire a mobility protocol used by the terminal when switching to the target access network; The obtaining unit 1001 may include: a first obtaining unit 10011, configured to acquire information about a mobility protocol used by the terminal in the current access network, where the first determining unit 10012 is configured to determine that the terminal acquired by using the first acquiring unit 10011 is The mobility protocol currently used by the access network acts as a mobility protocol used by the terminal when switching to the target access network.

The determining unit 1002 is configured to use, according to the information about the mobility protocol supported by the target access network acquired by the acquiring unit 1001, and the acquiring by the acquiring unit 1001 (specifically, the first determining unit 10012), when the terminal is switched to the target access network. The mobility protocol determines whether to initiate network reselection to the target access network.

As can be seen from the above, the current embodiment of the network selection device can acquire the mobility protocol supported by the target access network, and can acquire the mobility protocol used by the terminal when switching to the target access network, so that the network can be supported according to the target access network. The information of the mobility protocol and the mobility protocol used by the terminal when switching to the target access network determine whether to initiate network reselection to the target access network, which can prevent the terminal from accessing the target access when directly switching to the target access network. Network, thereby improving user experience.

As shown in FIG. 10, the first embodiment of the network selection apparatus provided by the embodiment of the present invention may further include an initiating unit 1003, configured to use the terminal acquired by the obtaining unit 1001 when the determining unit 1002 determines to initiate network reselection to the target access network. The mobility protocol used when switching to the target access network initiates a network reselection to the target access network.

Figure 11 is a diagram showing the structure of the second embodiment of the network selection device, including:

The acquiring unit 1101 is configured to acquire information about a mobility protocol supported by the target access network, and acquire a mobility protocol used by the terminal when switching to the target access network;

The obtaining unit 1101 may include: a second obtaining unit 11011, configured to acquire information about a mobility protocol supported by the terminal, and information about a mobility protocol supported by the access anchor; and second determining unit 11012, configured to acquire according to the second The information about the mobility protocol supported by the terminal acquired by the unit 11011 and the mobility protocol supported by the access anchor determine the mobility protocol supported by the terminal and the access anchor as the terminal uses when switching to the target access network. Mobility agreement.

The determining unit 1102 is configured to use, according to the information about the mobility protocol supported by the target access network acquired by the acquiring unit 1101, and the acquiring by the acquiring unit 1101 (specifically, the second determining unit 11012), when the terminal is switched to the target access network. The mobility protocol determines whether to initiate network reselection to the target access network. The selecting unit 1103 is configured to determine, by the determining unit 1002, that a network reselection is initiated to the target access network, and the acquiring unit 1101 (specifically, the second determining unit 11012) acquires a mobility protocol used by the terminal when switching to the target access network. When there are at least two, select one mobility protocol from at least two mobility protocols;

The initiating unit 1104 is configured to initiate network reselection to the target access network by using one mobility protocol selected by the selecting unit 1103.

As can be seen from the above, the current embodiment of the network selection device can obtain the mobility protocol supported by the target access network, and can obtain the mobility protocol supported by the terminal and the access anchor as the terminal uses when switching to the target access network. a mobility protocol, so that the network reselection is initiated only to the target access network when the mobility protocol supported by the target access network includes the mobility protocol supported by the terminal and the access anchor, thereby preventing the terminal from directly switching to the target connection. When accessing the network, the target access network cannot be accessed, which can improve the user experience.

The network selection apparatus provided by the embodiment of the present invention can be used as an ANDSF entity.

The terminal provided by the embodiment of the present invention is further introduced. FIG. 12 is a diagram showing the structure of the first embodiment of the terminal, including:

The receiving unit 1201 is configured to receive a network discovery and selection policy, where the network discovery and selection policy includes information about a mobility protocol supported by the target access network;

The determining unit 1202 is configured to determine whether to initiate network reselection to the target access network according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal received by the receiving unit.

As can be seen from the above, the current embodiment of the terminal can acquire the mobility protocol supported by the target access network, and can obtain the mobility protocol supported by the target access network and the mobility protocol used by the terminal when switching to the target access network. Determine whether to initiate network reselection to the target access network, so as to prevent the terminal from directly accessing the target access network and not accessing the target access network, thereby improving user experience.

As shown in FIG. 12, the first embodiment of the terminal provided by the embodiment of the present invention may further include:

The initiating unit 1203 is configured to: when the determining unit 1202 determines to initiate network reselection to the target access network, initiate a network reselection to the target access network by using a mobility protocol supported by the terminal included in the mobility protocol supported by the target access network. .

Figure 13 depicts the structure of the second embodiment of the terminal, including:

The receiving unit 1301 is configured to receive a network discovery and selection policy, and the network discovery and selection policy Information including the mobility protocol supported by the target access network;

The determining unit 1302 is configured to determine whether to initiate network reselection to the target access network according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal, where the determining unit 1303 is configured to be used in the determining unit 1302 Determining to initiate network reselection to the target access network, and the number of mobility protocols supported by the target receiving network received by the receiving unit 1301 is at least two, and the terminal supports at least two of the at least two mobility protocols. Selecting a mobility protocol from at least two mobility protocols supported by the terminal;

The initiating unit 1304 is configured to initiate network reselection to the target access network by using one mobility protocol selected by the selecting unit 1203.

As can be seen from the above, the current embodiment of the terminal can obtain the mobility protocol supported by the target access network, so that the mobility protocol included in the mobility protocol supported by the target access network and the mobility protocol supported by the terminal can be used to initiate the network to the target access network. The reselection can ensure that the terminal can successfully switch to the target access network and improve the user experience.

Figure 14 depicts the structure of the third embodiment of the terminal, including:

The receiving unit 1401 is configured to receive a network discovery and selection policy, where the network discovery and selection policy includes information about a mobility protocol supported by the target access network;

The determining unit 1402 is configured to determine whether to initiate network reselection to the target access network according to the mobility protocol supported by the target access network received by the receiving unit 1401 and the mobility protocol used by the terminal in the current access network.

As can be seen from the above, the current embodiment of the terminal can obtain the mobility protocol supported by the target access network, and can determine whether to initiate the network to the target access network according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal. Re-selection can prevent the terminal from accessing the target access network when directly switching to the target access network, thereby improving user experience.

As shown in FIG. 14, the third embodiment of the terminal provided by the embodiment of the present invention may further include an initiating unit 1403, configured to use the terminal in the current access network when the determining unit 1402 determines to initiate network reselection to the target access network. The mobility protocol initiates network reselection to the target access network.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When implemented, may include implementation of the methods as described above The flow of the example. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The foregoing describes a network selection method, apparatus, and terminal provided by the embodiments of the present invention. The description of the above embodiments is only for helping to understand the method and the idea of the present invention. Meanwhile, for those skilled in the art, In view of the above, the description of the present invention is not limited to the scope of the present invention.

Claims

Claim

A network selection method, comprising:

2. The network selection method according to claim 1, wherein the step of acquiring the information of the mobility protocol supported by the target access network comprises:

Acquiring information of the mobility protocol supported by the target access network according to the configuration information; or acquiring information of the mobility protocol supported by the target access network from the access gateway control unit of the target access network.

The network selection method according to claim 2, wherein the step of acquiring information of the mobility protocol supported by the target access network from the access gateway control unit of the target access network comprises: directly connecting from the target The access gateway control unit of the incoming network obtains information about the mobility protocol supported by the target access network; or

The information of the mobility protocol supported by the target access network is obtained by the policy control function entity from the access gateway control unit of the target access network.

The network selection method according to any one of claims 1 to 3, wherein the information according to the mobility protocol supported by the target access network and the terminal are used when switching to the target access network. The mobility protocol, determining whether to initiate network reselection to the target access network includes: if the mobility protocol supported by the target access network does not include a mobility protocol used by the terminal when switching to the target access network Not initiating network reselection to the target access network; or

If the mobility protocol supported by the target access network includes a mobility protocol used by the terminal when switching to the target access network, use a mobility protocol used by the terminal when switching to the target access network to the The target access network initiates network reselection.

The network selection method according to claim 4, wherein the mobility protocol used by the terminal when switching to the target access network includes:

The mobility protocol used by the terminal in the current access network; or

The mobility protocol supported by the terminal; or a mobility protocol supported by the access anchor accessed by the terminal; or

A mobility protocol supported by both the terminal and the access anchor accessed by the terminal.

The network selection method according to claim 5, wherein the step of acquiring the mobility protocol used by the terminal in the current access network comprises:

Obtaining, directly from the access anchor point, information about a mobility protocol used by the terminal in the current access network; or

The information of the mobility protocol used by the terminal in the current access network is retrieved from the access anchor by the policy control function entity.

The network selection method according to claim 5, wherein the step of acquiring the mobility protocol supported by the terminal comprises:

Obtaining information about the mobility protocol supported by the terminal according to the configuration information; or

Obtaining information of the mobility protocol supported by the terminal from the terminal.

The network selection method according to claim 5, wherein the step of acquiring the mobility protocol supported by the access anchor accessed by the terminal comprises:

Obtaining information about the mobility protocol supported by the access anchor according to the configuration information; or

Obtaining information of the mobility protocol supported by the access anchor from the access anchor.

The network selection method according to claim 4, wherein the number of mobility protocols used by the terminal when switching to the target access network is at least two;

If the mobility protocol supported by the target access network includes one of the at least two mobility protocols, the mobility protocol used by the using terminal when switching to the target access network is The steps for the target access network to initiate network reselection include:

Initiating network reselection to the target access network using the one mobility protocol;

Or

If the mobility protocol supported by the target access network includes at least two mobility protocols of the at least two mobility protocols, the mobility protocol used by the usage terminal when switching to the target access network The steps of the target access network to initiate network reselection include:

Selecting, by the at least two terminals included in the mobility protocol supported by the target access network, a mobility protocol selected from a mobility protocol used when switching to the target access network, using the selected one mobility protocol to the The target access network initiates network reselection.

The network selection method according to claim 9, wherein the mobility protocol used by at least two terminals included in the mobility protocol supported by the target access network when switching to the target access network The steps to select a mobility protocol include:

Selecting, from the mobility protocol used by at least two terminals included in the mobility protocol supported by the target access network, when switching to the target access network, randomly selecting a mobility protocol; or

Selecting, in a mobility protocol used by at least two terminals included in the mobility protocol supported by the target access network, when switching to the target access network, selecting a mobility protocol according to the preference of the user; or supporting from the target access network The mobility protocol includes at least two terminals in a mobility protocol used when switching to the target access network, and selecting a mobility protocol according to the operator's preference.

11. A network selection method, comprising:

Receiving a network discovery and selection policy from a network discovery and selection entity, the network discovery and selection policy including a network access and a selection of an entity to obtain a mobility protocol supported by the target access network, according to the mobile supported by the target access network The protocol and the mobility protocol supported by the terminal determine whether to initiate network reselection to the target access network.

The network selection method according to claim 11, wherein the determining, according to the mobility protocol supported by the target access network and the mobility protocol supported by the terminal, determining whether to initiate a network to the target access network The steps to reselect include:

If the mobility protocol supported by the target access network does not include the mobility protocol supported by the terminal, does not initiate network reselection to the target access network; or

If the mobility protocol supported by the target access network includes a mobility protocol supported by the terminal, initiate a network reselection to the target access network by using a mobility protocol supported by the terminal included in the mobility protocol supported by the target access network. .

The network selection method according to claim 12, wherein the mobility protocol supported by the target access network includes at least two mobility protocols supported by the terminal;

The step of using the mobility protocol supported by the terminal included in the mobility protocol supported by the target access network to initiate network reselection to the target access network includes:

Selecting one mobility protocol from the at least two mobility protocols, and initiating network reselection to the target access network using the one mobility protocol.

14. The network selection method according to claim 13, wherein the step of selecting one mobility protocol from the at least two mobility protocols comprises:

Randomly selecting a mobility protocol from the at least two mobility protocols; or

A mobility protocol is selected from the at least two mobility protocols according to a user's preference.

15. A network selection method, comprising:

Receiving a network discovery and selection policy from a network discovery and selection entity, the network discovery and selection policy including a network access and a selection of an entity to obtain a mobility protocol supported by the target access network, according to the mobile supported by the target access network The sexual agreement and the mobility protocol used by the terminal in the current access network determine whether to initiate network reselection to the target access network.

The network selection method according to claim 15, wherein the mobility protocol supported by the target access network and the mobility protocol used by the terminal in the current access network determine whether to access the target The steps for the network to initiate network reselection include:

If the mobility protocol supported by the target access network includes a mobility protocol used by the terminal in the current access network, use the mobility protocol used by the terminal in the current access network to initiate network reselection to the target access network. ; or

If the mobility protocol supported by the target access network does not include a mobility protocol used by the terminal in the current access network, network reselection is not initiated to the target access network.

17. A network selection device, comprising:

And an acquiring unit, configured to acquire information about a mobility protocol supported by the target access network; acquire a mobility protocol used by the terminal when switching to the target access network;

a determining unit, configured to determine, according to the mobility protocol supported by the target access network acquired by the acquiring unit, and the mobility protocol used by the terminal when switching to the target access network, determine whether to access the target access network Initiate a network reselection.

The network selection device according to claim 17, further comprising:

An initiating unit, configured to: when the determining unit determines to initiate network reselection to the target access network, use a mobility protocol used by the terminal acquired by the acquiring unit when switching to the target access network to the The target access network initiates network reselection.

The network selection device according to claim 18, further comprising: a selecting unit, configured to: when the acquiring unit acquires at least two mobility protocols used by the terminal when switching to the target access network, select one mobility protocol from the at least two mobility protocols;

The initiating unit is configured to initiate network reselection to the target access network by using one mobility protocol selected by the selecting unit.

The network selection device according to any one of claims 17 to 19, wherein the obtaining unit comprises:

a first obtaining unit, configured to obtain a first determining unit of the mobility protocol used by the terminal in the current access network, to determine mobility of the terminal used by the first acquiring unit in the current access network The protocol acts as a mobility protocol used by the terminal when switching to the target access network.

a second acquiring unit, configured to acquire information about a mobility protocol supported by the terminal and information about a mobility protocol supported by the access anchor;

a second determining unit, configured to determine, according to information about a mobility protocol supported by the terminal acquired by the second acquiring unit, and information about a mobility protocol supported by the access anchor, using the terminal and the access anchor The mobility protocol supported by the point serves as a mobility protocol used by the terminal when switching to the target access network.

22. A terminal, comprising:

The terminal according to claim 22, further comprising:

An initiating unit, configured to: when the determining unit determines to initiate network reselection to the target access network, use the mobility protocol supported by the terminal included in the mobility protocol supported by the target access network to connect to the target Into the network to initiate network reselection.

The terminal according to claim 23, further comprising:

a selection unit, a mobility protocol supported when the target receiving network received by the receiving unit accesses the network When the number is at least two, and the terminal supports at least two of the at least two mobility protocols, selecting one mobility protocol from at least two mobility protocols;

25. A terminal, comprising:

And a determining unit, configured to determine, according to the mobility protocol supported by the target access network received by the receiving unit, and the mobility protocol used by the terminal in the current access network, whether to perform network reselection to the target access network.

The terminal according to claim 25, further comprising:

And an initiating unit, configured to: when the determining unit determines to initiate network reselection to the target access network, initiate a network reselection to the target access network by using a mobility protocol used by the terminal in a current access network.