CN101827411A

CN101827411A - Network selection method, device and terminal

Info

Publication number: CN101827411A
Application number: CN200910118168A
Authority: CN
Inventors: 周青; 胡颖; 王珊珊; 吴问付
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-03-04
Filing date: 2009-03-04
Publication date: 2010-09-08
Anticipated expiration: 2029-03-04
Also published as: WO2010099741A1; CN101827411B

Abstract

The invention relates to the technical field of communication, and discloses a network selection method, a device and a terminal. The network selection method comprises the steps: acquiring information of mobility protocol supported by a target access network; acquiring mobility protocol used when the terminal is switched to the target access network; and determining whether to start a network re-selection to the target access network according to the information of mobility protocol supported by the target access network and the mobility protocol used when the terminal is switched to the target access network. The technical scheme provided by the embodiment of the invention is capable of determining whether to switch the terminal to the target access network.

Description

A kind of network selecting method, device and terminal

Technical field

The present invention relates to communication technical field, be specifically related to a kind of network selecting method, device and terminal.

Background technology

Along with development of telecom technology, mobile packet network is by packet network (the EPS:Evolved Packet System) development of 3G (Third Generation) Moblie (3G) network to evolution, the core net of mobile packet network is also by mobile packet-based core networks (the EPC:Evolved Packet Core) development of GPRS (GPRS) network in traditional second generation mobile communication (2G) and the 3G network to evolution, the EPC network can be supported traditional third generation partner program (3GPP) access technology (2G or 3G), the 3GPP access technology (Long Term Evolution) of evolution, the comprehensive access of multiple access technologies such as non-3GPP (non-3GPP) access technology, wherein the non-3GPP access technology comprises that code division multiple access (CDMA:Code-Division Multiple Access) inserts, micro-wave access global inter communication (WiMax:Worldwide Interoperability for Microwave Access) access and Wireless Fidelity (WiFi:Wireless Fidelity) access etc.

Appearance along with bimodulus or multimode terminal (UE); make terminal can be linked into the EPC network by different access technologies; find and selection for the network of realizing multiple access technology, introduced network discovery and selection function (ANDSF:Access Network Discovery and Selection Function) entity and helped terminal to carry out network selecting.

Existing a kind of network selecting method: after the ANDSF entity finds that terminal has entered the coverage of target access network, if determining target access network is preferred network (being the preferential network that inserts under the square one), the ANDSF entity can arrive terminal by distributing policy (suggested terminals switches to target access network or non-suggested terminals switches to target access network), determines whether to switch to target access network by terminal according to strategy.

The inventor finds in to the research of prior art: because terminal can use different mobility protocols to be linked into network, network also can use different mobility protocols, when therefore stating network selecting method in the use, the strategy that terminal issues according to the ANDSF entity determines to switch to target access network, if terminal is not supported the employed mobility protocol of this target access network, will cause terminal can't insert this target access network.

Summary of the invention

The embodiment of the invention provides a kind of network selecting method, device and terminal, and the technical scheme of using the embodiment of the invention to provide can determine whether terminal is switched to target access network.

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

The embodiment of the invention provides a kind of network selecting method, comprising:

Obtain the information of the mobility protocol of target access network support;

Obtain the mobility protocol that terminal is used when switching to described target access network;

According to the information of the mobility protocol of described target access network support and the mobility protocol that terminal is used when switching to described target access network, determine whether to initiate network reselection to described target access network.

The embodiment of the invention also provides a kind of network selecting method, comprising:

Receive the network of automatic network discovery and selection entity to find and selection strategy, described network discovery and selection strategy comprise the information of the mobility protocol of the target access network support that network is found and the selection entity obtains;

Mobility protocol according to the mobility protocol and the terminal of described target access network support are supported determines whether to initiate network reselection to described target access network.

Mobility protocol of supporting according to described target access network and terminal determine whether to initiate network reselection to described target access network at the mobility protocol that current access network uses.

The embodiment of the invention also provides a kind of network selection apparatus, comprising:

Acquiring unit is used to obtain the information of the mobility protocol that target access network supports; Obtain the mobility protocol that terminal is used when switching to described target access network;

Determining unit is used for the information of mobility protocol of the target access network support of obtaining according to described acquiring unit and the mobility protocol that terminal is used when switching to described target access network, determine whether to initiate network reselection to described target access network.

The embodiment of the invention also provides a kind of terminal, comprising:

Receiving element is used to receive network and finds and selection strategy, and described network discovery and selection strategy comprise the information of the mobility protocol that target access network is supported;

Determining unit, the mobility protocol that mobility protocol that the target access network that is used for receiving according to described receiving element is supported and terminal are supported determines whether to initiate network reselection to described target access network.

The embodiment of the invention also provides a kind of terminal, comprising:

Determining unit, mobility protocol that the target access network that is used for receiving according to described receiving element is supported and terminal determine whether to initiate network reselection to described target access network at the mobility protocol that current access network uses.

The above technical scheme that provides from the embodiment of the invention as can be seen, because present embodiment of the present invention can obtain the mobility protocol that target access network is supported, and can be according to the information of the mobility protocol of target access network support and the mobility protocol that terminal is used when switching to target access network, determine whether to initiate network reselection to target access network, thereby can not insert target access network in the time of can avoiding terminal to be directly switch into target access network, can improve user's impression.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The structure chart of the network architecture that Fig. 1 relates to for the embodiment of the invention;

Fig. 2 is the flow chart of network selecting method embodiment one in the embodiment of the invention;

Fig. 3 is the flow chart of network selecting method embodiment two in the embodiment of the invention;

Fig. 4 is the flow chart of network selecting method embodiment three in the embodiment of the invention;

Fig. 5 is the signaling process figure of network selecting method embodiment four in the embodiment of the invention;

Fig. 6 is the signaling process figure of network selecting method embodiment five in the embodiment of the invention;

Fig. 7 is the signaling process figure of network selecting method embodiment six in the embodiment of the invention;

Fig. 8 is the signaling process figure of network selecting method embodiment seven in the embodiment of the invention;

Fig. 9 is the signaling process figure of network selecting method embodiment eight in the embodiment of the invention;

Figure 10 is the structure chart of network selection apparatus embodiment one in the embodiment of the invention;

Figure 11 is the structure chart of network selection apparatus embodiment two in the embodiment of the invention;

Figure 12 is the structure chart of terminal embodiment one in the embodiment of the invention;

Figure 13 is the structure chart of terminal embodiment two in the embodiment of the invention;

Figure 14 is the structure chart of terminal embodiment three in the embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

The embodiment of the invention provides network selecting method, device and terminal, introduces the related network architecture of technical scheme that the embodiment of the invention provides earlier, and Fig. 1 has described the structure of this network architecture, comprising:

Terminal 101 has inserted current access network 102, because terminal 101 can be linked into the EPC network by different access technologies, therefore the quantity of current access network 102 can be a plurality of;

Anchor point when inserting anchor point 103 and be terminal and between different access networks, switching; This access anchor point can be the packet data gateway (PGW:PDN GW) in the EPC network;

Target access network 104 is terminal 101 current access networks that do not insert, owing to have a plurality of networks in the actual environment, so target access network also has a plurality of;

Wherein current access network 102 and target access network 104 are except comprising access network, comprised that also each access network is linked into other network element that inserts anchor point, described other network elements can be the IADs of access network, as the gateway in the EPC network (SGW), the packet data gateway of evolution (ePDG) etc.;

Network is found and selection functional entity 105 is to carry out the functional entity of network discovery and selection function, can be the ANDSF entity in the EPC network;

Can there be the E1 interface between network discovery and selection functional entity 105 and the terminal 101, the E1 interface specifically can be the S14 interface in the 3GPP framework, and network is found and selection functional entity 105 can send to terminal 101 with network discovery and selection strategy by the E1 interface;

Can have interface E2 between network discovery and selection functional entity 105 and terminal 101, access anchor point 103, current access network 102 or the target access network 104, network discovery and selection functional entity 105 can be obtained the information of mobility protocol by the E2 interface.

Further, the network architecture that the embodiment of the invention is used can also comprise the policy control functions entity, can have the E2 interface between network discovery and selection functional entity and the policy control functions entity, network discovery and selection functional entity also can be obtained the information of mobility protocol by the E2 interface from policy control functions (PCRF) entity.

As above introduced the network architecture that the embodiment of the invention is used, followingly introduced the technical scheme that the embodiment of the invention provides again, introduced the network selecting method that the embodiment of the invention provides earlier, Fig. 2 has described the flow process of network selecting method embodiment one, comprising:

201, obtain the information of the mobility protocol of target access network support;

Entered the coverage of target access network in terminal after, then terminal might need to switch to this target access network, so the ANDSF entity can obtain the information of the mobility protocol of this target access network support;

The ANDSF entity obtains the information of the mobility protocol of target access network support in the embodiment of the invention, mainly can adopt following dual mode:

(1) obtains the information of the mobility protocol that target access network supports according to configuration information;

(2) obtain the information of the mobility protocol that target access network supports from the IAD control unit of target access network; Particularly, can be directly obtain, also can obtain by the IAD control unit of policy control functions entity from target access network from the IAD control unit of target access network.

202, obtain the mobility protocol that terminal is used when switching to target access network;

The mobility protocol that terminal is used when switching to target access network can have following four kinds:

1, terminal is at the mobility protocol of current access network use.

The mobility protocol that the mobility protocol that uses terminal to use at current access network uses when switching to target access network as terminal, can not carry out the switching of mobility protocol, thereby the business that can guarantee to use the mobility protocol that uses at current access network to carry out can keep continuity.

Wherein, obtain by the access anchor point that terminal inserts at the information spinner of the mobility protocol of current access network use, suppose that inserting anchor point is PGW, mainly contains following dual mode if obtain terminal:

(1) the direct information of obtaining the mobility protocol of current access network use from PGW;

Particularly, the information of the mobility protocol that can directly current access network be used by PGW reports the ANDSF entity; PGW can report the information of the mobility protocol of current access network use on one's own initiative to the ANDSF entity, also can report the information of the mobility protocol of current access network use after the triggering message that has received the transmission of ANDSF entity to the ANDSF entity; PGW and ANDSF entity are by the E2 interface communication;

The E2 interface protocol can be diameter (Diameter) agreement, in order in Diameter, to transmit the information of terminal at the mobility protocol of current access network use, can use new Diameter message, this new Diameter message can be the mobility protocol reporting message; Also can expand the information of terminal of transmitting to existing Diameter message at the mobility protocol of current access network use;

In order in Diameter, to transmit mobility protocol information, can in the existing message of above-mentioned new message or expansion, carry a mobility protocol property value to (AVP:AttributeValuePair), as mobility protocol type (MobileProtocolType) AVP, value is an enumerated value, specifically can choose from proxy mobile IP protocol version six (PMIPv6), mobile IP edition 4 (MIPv4), two stack mobile IP protocol versions six (DSMIPv6) and general packet wireless service tunnel protocol agreements such as (GTP);

(2) obtain the information of terminal by the policy control functions entity from PGW at the mobility protocol of current access network use;

Particularly, PGW can use the existing Gx interface of 3GPP, the information of the mobility protocol that terminal is used at current access network passes to the PCRF entity, and PGW can set up in the message in the IP session of existing Gx interface, and the mobility protocol of current use is passed to the PCRF entity; The PCRF entity can send to the ANDSF entity with terminal in the mobility protocol information that current access network uses by the E2 interface then.

2, the mobility protocol all supported of terminal and access anchor point;

In order to obtain terminal and to insert the mobility protocol that anchor point is all supported, need obtain the information of the mobility protocol of terminal support; Obtain the information of the mobility protocol that inserts the anchor point support; The common factor of the letter of the mobility protocol of the information of the mobility protocol of use terminal support and the support of access anchor point is as terminal and insert the mobility protocol that anchor point is all supported.

Wherein obtaining the information of the mobility protocol of terminal support can carry out in the following way:

(1) obtain the information of the mobility protocol that terminal supports according to the method for configuration, for example can the calling party subscribed database, obtain the mobility protocol information that terminal is supported from user-subscribed database;

(2) obtain the information of the mobility protocol that this terminal supports from terminal, particularly, terminal can be when being connected to the ANDSF entity, the information notice ANDSF entity of the mobility protocol of this terminal being supported by the E2 interface;

E2 interface protocol herein can be open mobile alliance device management (OMADM) agreement, in order in OMA DM agreement, to transmit above-mentioned mobility protocol information, can in OMA DM agreement, carry an OMADM management object (MO:Management Object), as mobility protocol list of types (MobileProtocolTypeList) MO, value is one or more MobileProtocolType, the value of MobileProtocolType is an enumerated value, specifically can choose from agreements such as PMIPv6, MIPv4, DSMIPv6 and GTP.

Obtaining the information of the mobility protocol that inserts the anchor point support can carry out in the following way:

(1) obtain the information that inserts the mobility protocol that anchor point supports according to the method for configuration, particularly, the ANDSF entity can dispose present networks and insert the protocol type that anchor point can be supported, thereby can obtain the information that inserts the mobility protocol that anchor point supports;

(2), insert the information notice ANDSF entity that anchor point can will insert the mobility protocol of anchor point support by the E2 interface from inserting the information that anchor point obtains the mobility protocol of this access anchor point support;

E2 interface protocol herein can be a Diameter, in order to transmit the information of the mobility protocol that inserts the anchor point support in Diameter, can use a pair of new message, supposes it is mobility protocol capability query/reporting message; The ANDSF entity sends the information that mobility protocol capability query information query inserts the mobility protocol of anchor point support, inserts anchor point by mobility protocol ability reporting message, and the information that inserts the mobility protocol of anchor point support is reported the ANDSF entity;

In order in Diameter, to transmit the information of the mobility protocol that inserts the anchor point support, can in mobility protocol ability reporting message, carry a mobility protocol tabulation AVP, as MobileProtocolTypeList AVP, value is one or more MobileProtocolType, the value of MobileProtocolType is an enumerated value, specifically can choose from agreements such as PMIPv6, MIPv4, DSMIPv6 and GTP.

3, the mobility protocol of terminal support;

In actual applications, can support all mobility protocols usually owing to insert anchor point, therefore, the mobility protocol that also can use the mobility protocol of terminal support when switching to target access network, to use as terminal.

The method of information of obtaining the mobility protocol that terminal supports is with 2;

4, insert the mobility protocol that anchor point is supported.

Under some particular case, such as obtaining the mobility protocol that terminal is supported, therefore, the mobility protocol that also can use the mobility protocol that inserts the anchor point support when switching to target access network, to use as terminal.

Obtain the method same 2 of the information of the mobility protocol that inserts the anchor point support;

203,, determine whether to initiate network reselection to target access network according to the information of the mobility protocol of target access network support and the mobility protocol that terminal is used when switching to target access network.

Particularly, when the mobility protocol of target access network support comprises the mobility protocol that terminal uses when switching to target access network, the mobility protocol that uses terminal to use when switching to target access network is initiated network reselection to target access network.

When the mobility protocol of target access network support does not comprise the mobility protocol that terminal uses when switching to target access network, then do not initiate network reselection to target access network.

Wherein, if the quantity of the mobility protocol that terminal is used when switching to target access network is at least two, and the mobility protocol of target access network support has only comprised a mobility protocol in described at least two mobility protocols, then directly uses a described mobility protocol to initiate network reselection to target access network.

If the quantity of the mobility protocol that terminal is used when switching to target access network is at least two, and the mobility protocol of target access network support has comprised at least two in described at least two mobility protocols, then need from the mobility protocol that two terminals that the mobility protocol of target access network support comprises are used, to select a mobility protocol at least when switching to target access network, and then use a mobility protocol of selecting to initiate network reselection to target access network; Wherein, from from least two mobility protocols, selecting a mobility protocol at random, also can from least two mobility protocols, select a mobility protocol according to user's the preference or the preference of operator.

Process from network reselection to target access network that initiate can be the switching flow of directly initiating terminal is switched to from current access network target access network.

Process from network reselection to target access network that initiate also can be that distributing policy arrives terminal, comprises target access network information in the strategy, is initiated to switch to the switching flow of target access network according to target access network information by terminal; May further include selected mobility protocol information in the strategy, determine whether to initiate to switch according to this mobility protocol information by terminal;

The process to target access network initiation network reselection can not finish current flow process; Perhaps distributing policy comprises the mobility protocol information that target access network information and objective network are supported to terminal in the strategy, and terminal is not initiated switching flow according to above-mentioned information;

In the present embodiment, 201 and 202 execution does not have ordinal relation;

From the above, present embodiment can obtain the mobility protocol that target access network is supported, and can obtain the mobility protocol that terminal is used when switching to target access network, thereby can be according to the information of the mobility protocol of target access network support and the mobility protocol that terminal is used when switching to target access network, determine whether to initiate network reselection to target access network, can not insert target access network in the time of can avoiding terminal to be directly switch into target access network, thereby improve user's impression.

Fig. 3 has described the flow process of the network selecting method embodiment two that the embodiment of the invention provides, and what this embodiment described is the handling process of terminal, comprising:

301, receive the network of automatic network discovery and selection entity to find and selection strategy, this network discovery and selection strategy comprise the information of the mobility protocol of the target access network support that network is found and the selection entity obtains;

302, the mobility protocol of supporting according to the mobility protocol and the terminal of target access network support determines whether to initiate network reselection to target access network.

Particularly, if the mobility protocol of target access network support comprises the mobility protocol that terminal is supported, use that comprise and the mobility protocol terminal support of the mobility protocol of target access network support to initiate network reselection to target access network.

If the mobility protocol of target access network support does not comprise the mobility protocol that terminal is supported, do not initiate network reselection to target access network.

Wherein, if mobility protocol that the mobility protocol of target access network support comprises and that terminal is supported is at least two, then use that comprise and the mobility protocol terminal support of the mobility protocol of target access network support to comprise: to select a mobility protocol from the mobility protocol of target access network support that comprise and at least two mobility protocols that terminal is supported, use a mobility protocol of selecting to initiate network reselection to target access network to the step that target access network is initiated network reselection; Particularly, can from two mobility protocols, select one at random, also can from least two mobility protocols, select one according to user's preference.

From the above, present embodiment can obtain the mobility protocol that target access network is supported, and can be according to the mobility protocol of target access network support and the mobility protocol of terminal support, determine whether to initiate network reselection to target access network, thereby can not insert target access network when avoiding terminal to be directly switch into target access network, can improve user's impression.

Fig. 4 has described the flow process of the network selecting method embodiment three that the embodiment of the invention provides, and what this embodiment described is the handling process of terminal, comprising:

401, receive the network of automatic network discovery and selection entity to find and selection strategy, network discovery and selection strategy comprise the information of the mobility protocol of the target access network support that network is found and the selection entity obtains;

402, mobility protocol of supporting according to target access network and terminal determine whether to initiate network reselection to target access network at the mobility protocol that current access network uses.

Particularly, if the mobility protocol of target access network support comprises the mobility protocol that terminal is used at current access network, use terminal to initiate network reselection to target access network at the mobility protocol that current access network uses.

If the mobility protocol of target access network support does not comprise the mobility protocol that terminal is used at current access network, do not initiate network reselection to target access network;

From the above, present embodiment can obtain the mobility protocol that target access network is supported, and the mobility protocol that mobility protocol of supporting according to target access network and terminal are used at current access network, determine whether to initiate network reselection to target access network, thereby can not insert target access network in the time of can avoiding terminal to be directly switch into target access network, improve user's impression.

Fig. 5 has described the signaling process of the network selecting method embodiment four that the embodiment of the invention provides, the multimode terminal that the user uses among this embodiment, support the access that 3GPP inserts, non-3GPP trusty inserts (trusted non-3GPP access) and fly-by-night non-3GPP access (untrusted non-3GPP access), wherein the network of trusted non-3GPP access can be the WiMax network, and the network of untrusted non-3GPP access can be the WiFi network; The WiFi network is the preferred network that exists under the service conditions.The access network of the current access of terminal is the WiMax network, and the mobility protocol of use is MIPv4.

501, UE inserts EPC by the IAD of WiMax network, carries out business by the WiMax network; UE is MIPv4 at the mobility protocol that the WiMax network uses;

502, the ANDSF entity obtains the mobility protocol information that UE uses at the WiMax network;

In the embodiment of the invention, the ANDSF entity obtains mobility protocol information that UE uses at the WiMax network can be in the following way:

(1) PGW directly reports the ANDSF entity, and PGW can send to the ANDSF entity with UE in the mobility protocol information that the WiMax network uses by the E2 interface;

Wherein, PGW can also report the ANDSF entity with the UE sign except reporting UE the mobility protocol that the WiMax network uses;

(2) PGW reports ANDSF entity with UE in the mobility protocol information that the WiMax network uses by the PCRF entity; PGW can utilize the existing Gx interface of 3GPP, and UE is passed to the PCRF entity at the mobility protocol that the WiMax network uses, the PCRF entity uses UE by the E2 interface at the WiMax network mobility protocol information notice ANDSF entity;

PGW can set up in the message in the IP session of existing Gx interface, and UE is passed to the PCRF entity at the mobility protocol that the WiMax network uses;

The PCRF entity can also report the ANDSF entity with the UE sign except the mobility protocol that reports current use;

In the present embodiment because UE is MIPv4 at the mobility protocol that the WiMax network uses, so the ANDSF entity can to obtain UE from PG W be MIPv4 at the mobility protocol of WiMax network use.

Except UE the mobility protocol information that the WiMax network uses, the ANDSF entity can also further obtain the business information that UE uses at the WiMax network and/or insert the ability that anchor point switches between the different agreement agreement, and inserting anchor point in the present embodiment is PGW;

Wherein, the ANDSF entity can obtain the business information that UE uses at the WiMax network from PCRF entity or AF by the E2 interface, and business information can comprise service quality (QoS:Quality of Service) rank, bandwidth etc.;

The ANDSF entity can obtain the ability that PGW switches by the method for configuration between the different agreement agreement; The ANDSF entity also can pass through the E2 interface, obtains the ability that PGW switches from PGW between the different agreement agreement; Wherein, the E2 interface protocol can adopt Diameter.

503, UE moves to the hot zones of the WiFi network coverage;

Particularly, the ANDSF entity can enter the hot zones of a WiFi network coverage according to the position information confirming UE of UE, because the WiFi network is a preferred network, so the ANDSF entity need confirm whether initiate network reselection to Wi Fi network; The positional information of UE can report by UE, and perhaps other network element such as PGW report;

504, the ANDSF entity obtains the mobility protocol information of WiFi network support;

In the embodiment of the invention, the ANDSF entity can obtain the mobility protocol information that target access network (present embodiment is the WiFi network) is supported in the following way:

(1) obtains according to the method for configuration; In the present embodiment, the WiFi network is a fly-by-night non-3GPP access network, and UE can only insert EPC by PMIPv6 and two kinds of agreements of DSMIPv6 at fly-by-night non-3GPP access network, therefore, the protocol information of target WiFi network support is exactly PMIPv6 and DSMIPv6;

(2) by the E2 interface mobility protocol information of target access network support is sent to the ANDSF entity by the IAD control unit of target access network;

Wherein, the IAD control unit of target access network is according to the difference of target access network and difference for example can be ePDG, SGW, perhaps IAD in the non-3GPP network etc.; The IAD control unit of WiFi network can be ePDG in this enforcement.

The E2 interface protocol can be a Diameter, in order to transmit above-mentioned mobility protocol information in Diameter, can use a pair of new message, supposes it is mobility protocol capability query/reporting message; The ANDSF entity sends mobility protocol capability query message and inquires about, and the IAD control unit passes through mobility protocol ability reporting message, and the mobility protocol information that target access network is used reports the ANDSF entity.

In order in Diameter, to transmit the mobility protocol information that target access network is supported, can in mobility protocol ability reporting message, carry a mobility protocol tabulation AVP, as MobileProtocolTypeList AVP, value is one or more MobileProtocolType, the value of MobileProtocolType is an enumerated value, specifically can choose from agreements such as PMIPv6, MIPv4, DSMIPv6 and GTP.In the present embodiment, ePDG reports the ANDSF entity with PMIPv6 and DSMIPv6.

Because DSMIPv6 does not need the direct support of access network control unit, therefore, in practical application

In, can be the mobility protocol of DSMIPv6 as the default support of target access network, thus do not need initiatively to report.

(3) the IAD control unit of target access network also can report the ANDSF entity with the information of the mobility protocol of target access network support by the PCRF entity.The IAD control unit of target access network can utilize the interface between the existing and PCRF entity of 3GPP, the mobility protocol information of target access network support is passed to the PCRF entity, and the PCRF entity can be notified the ANDSF entity by the mobility protocol information that the E2 interface is supported target access network.

In the present embodiment, the mobility protocol information that the ANDSF entity can obtain the WiFi network support is PMIPv6 and DSMIPv6.

505, because the WiFi network is not supported MIPv4, the decision of ANDSF entity is not initiated network reselection to the WiFi network.

The ANDSF entity is according to the mobility protocol of current use, obtains terminal when target access network inserts, and the mobility protocol of use is MIPv4; Because target access network WiFi network is not supported MIPv4, therefore, do not initiate network reselection to the WiFi network.

Be understandable that, need before 505, carry out the realization that can not influence present embodiment for 502.

The business information that the ANDSF entity can also use at the WiMax network according to UE or insert the ability that anchor point switches judge whether to initiate network reselection between the different agreement agreement to the WiFi network, for example UE is in the current business that do not exist of WiMax network, perhaps the business of current use allows the loss of traffic that causes between different mobility protocols, and then UE employed mobility protocol when switching to the WiFi network can not be the agreement that UE uses at the WiMax network.Be not supported in when switching between the different agreement agreement if insert anchor point, then UE employed mobility protocol when switching to the WiFi network only can be the agreement that UE uses at the WiMax network.The present embodiment hypothesis inserts the switching that anchor point is not supported mobility protocol, perhaps UE does not support the switching of mobility protocol in the business that the WiMax network uses, thereby just initiates network reselection to the WiFi network only can comprise MIPv4 at the mobility protocol of WiFi network support the time.

Wherein, the ANDSF entity can not done to judge directly after obtaining the mobility protocol information of WiFi network support and is initiated network reselection to the WiFi network, network discovery and selection strategy are sent to UE, division of a ci poem network is found and selection strategy comprises target access network information, target access network information can be the service set (SSID:Service Set Identifier) of WiFi network etc., and the mobility protocol information of WiFi network support, be meant the protocol type of WiFi network support in the present embodiment, i.e. PMIPv6 and DSMIPv6; Terminal can be determined not initiate network reselection to the WiFi network according to the information that network is found and selection strategy comprises, and does not promptly carry out switching flow.The ANDSF entity can be handed down to UE with network discovery and selection strategy by the S14 interface.

From the above, present embodiment can obtain the mobility protocol of WiFi network support, and can determine not initiate network reselection according to the mobility protocol that terminal is used at the WiMax network to the WiFi network, thereby can not insert the WiFi network when having avoided terminal to switch to the WiFi network, can improve user's impression.

Fig. 6 has described the signaling process of the network selecting method embodiment five that the embodiment of the invention provides, the user uses multimode terminal in this embodiment, support 3GPP, the access of trusted non-3GPP access (WiMax network) and untrusted non-3GPP access (WiFi network); The WiFi network is the preferred network that exists under the service conditions, and the current access of terminal WiMax network carries out business, and the mobility protocol that uses at the WiMax network is PMIPv6.

601, UE inserts EPC by the IAD of WiMax network, carries out business by the WiMax network; UE is PMIPv6 at the mobility protocol that the WiMax network uses;

602, the ANDSF entity obtains the mobility protocol information that UE uses at the WiMax network;

Carry out with reference to 502.To obtain UE be PMIP v6 at the mobility protocol that the WiMax network uses to the ANDSF entity in the present embodiment.

603, UE moves to the hot zones of the WiFi network coverage;

Carry out with reference to 503.

604, the ANDSF entity obtains the mobility protocol information of WiFi network support;

Carry out with reference to 504.In the present embodiment, the mobility protocol that the ANDSF entity obtains the WiFi network support is PMIPv6 and DSMIPv6;

605, owing to WiFi network support PMIPv6, the ANDSF entity is determined to initiate network reselection to the WiFi network.

Process from network reselection to the WiFi network that initiate can be the switching flow of directly initiating UE is switched to from the WiMax network WiFi network.

Be understandable that, need before 605, carry out the realization that can not influence present embodiment for 602.

Wherein, the ANDSF entity can not done to judge directly after obtaining the mobility protocol information of WiFi network support and is initiated network reselection to the WiFi network, network discovery and selection strategy are sent to UE, network is found and selection strategy comprises target access network information (as the SSID of WiFi network etc.), and the mobility protocol information of Wi Fi network support, be meant the protocol type of WiFi network support in the present embodiment, i.e. PMIPv6 and DSMIPv6; Terminal can be determined to initiate network reselection to the WiFi network according to the information that network is found and selection strategy comprises, and promptly carries out switching flow.The ANDSF entity can be handed down to UE with network discovery and selection strategy by the S14 interface.

From the above, present embodiment can obtain the mobility protocol of WiFi network support, and can determine to initiate network reselection according to the mobility protocol that terminal is used at the WiMax network, thereby make terminal arrive preferred WiFi network by successful switch, can improve user's impression to the WiFi network.

Fig. 7 has described the signaling process of the network selecting method embodiment six that the embodiment of the invention provides, the user uses multimode terminal in this embodiment, support 3GPP, the access of trusted non-3GPP access (WiMax network) and untrusted non-3GPP access (WiFi network); The 3GPP network is the preferred network that exists under the service conditions, and the current access of terminal WiFi network carries out business, and the mobility protocol that uses at the WiFi network is PMIPv6.

701, UE inserts EPC by the IAD ePDG of WiFi network, carries out business by the WiFi network; UE is PMIPv6 at the mobility protocol that the WiFi network uses;

702, the ANDSF entity obtains the mobility protocol information that UE uses at the WiFi network;

Carry out with reference to 502.To obtain UE be PMIPv6 at the mobility protocol that the WiFi network uses to the ANDSF entity in the present embodiment;

703, UE moves to the area that 3GPP covers;

Particularly, the ANDSF entity can determine that UE has entered an area that 3GPP covers according to the positional information of UE, because the 3GPP network is a preferred network, so the ANDSF entity need confirm whether initiate network reselection to the 3GPP network; The positional information of UE can report by UE, and perhaps other network element such as PGW report;

704, the ANDSF entity obtains the mobility protocol information of target 3GPP network support;

Carry out with reference to 504.The IAD control unit of target access network is SGW in the present embodiment; The mobility protocol that the ANDSF entity obtains the 3GPP network support is PMIPv6, GTP;

705, the ANDSF entity is initiated network reselection according to the mobility protocol information of target 3GPP network support to the 3GPP network;

Because 3GPP network support PMIPv6, the ANDSF entity can be initiated network reselection to the 3GPP network.

Wherein, the ANDSF entity can not done to judge directly after obtaining the mobility protocol information of WiFi network support and is initiated network reselection to the 3GPP network, network discovery and selection strategy are sent to UE, network discovery and selection strategy comprise the mobility protocol information of the 3GPP network information and 3GPP network support, wherein the 3GPP network information comprises the 3GPP network type, the 3GPP network type can be Mobile Country Code MCC (MCC), Mobile Network Code (MNC), APN (APN) etc.; The mobility protocol of 3GPP network support comprises PMIPv6 in the present embodiment, GTP; Terminal can be determined to initiate network reselection to the 3GPP network according to the information that network is found and selection strategy comprises.

From the above, present embodiment can obtain the mobility protocol of 3GPP network support, and can determine to initiate network reselection according to the mobility protocol that terminal is used at the WiFi network, thereby make terminal arrive preferred 3GPP network by successful switch, can improve user's impression to the 3GPP network.

Fig. 8 has described the signaling process of the network selecting method embodiment seven that the embodiment of the invention provides, the user uses multimode terminal in this embodiment, support 3GPP, the access of trusted non-3GPP access (WiMax network) and untrusted non-3GPP access (WiFi network), terminal is supported PMIPv6; The WiMax network is the preferred network that exists under the service conditions, and the current access of terminal Wi Fi network carries out business, and the mobility protocol that uses at the WiFi network is PMIPv6.

801, UE inserts EPC by the IAD ePDG of WiFi network, and UE is PMIPv6 at the mobility protocol that the WiFi network uses;

802, the ANDSF entity obtains the mobility protocol information that UE supports;

In the embodiment of the invention, the ANDSF entity can obtain the mobility protocol information that UE supports in the following way:

(1) obtain according to the method for static configuration, for example the ANDSF entity can the calling party subscribed database, obtains the mobility protocol information that UE supports from user-subscribed database;

(2) UE notifies the ANDSF entity by the E2 interface with the mobility protocol information that UE supports;

UE can by the E2 interface, notify the ANDSF entity with the mobility protocol information that UE supports when being connected to the ANDSF entity;

Wherein, the E2 interface protocol can be an OMA DM agreement, in order in OMA DM agreement, to transmit above-mentioned mobility protocol information, can in OMA DM agreement, carry an OMA DM MO, as MobileProtocolTypeList MO, value is one or more MobileProtocolType, and the value of MobileProtocolType is an enumerated value, specifically can choose from agreements such as PMIPv6, MIPv4, DSMIPv6 and GTP;

In the present embodiment, the mobility protocol information that the ANDSF entity can obtain the UE support is PMIPv6.

Because PMIPv6 does not need participating in directly of UE, therefore, in actual applications, can be the mobility protocol of PMIPv6 as the default support of UE, the mobility protocol that the ANDSF entity can directly obtain the UE support is PMIPv6.

803, the ANDSF entity obtains and inserts the mobility protocol information that anchor point is supported, inserting anchor point in the present embodiment is PGW;

In the embodiment of the invention, the ANDSF entity can obtain the mobility protocol information that PGW supports in the following way:

(1) obtain according to the method for static configuration, for example the ANDSF entity can dispose the mobility protocol that present networks PGW can support;

(2) PGW sends to the ANDSF entity by the E2 interface with the mobility protocol information that PGW supports;

Wherein, the E2 interface protocol can be a Diameter, in order to transmit above-mentioned mobility protocol information in Diameter, can use a pair of new message, supposes it is mobility protocol capability query/reporting message; The ANDSF entity sends mobility protocol capability query message and inquires about, and PGW passes through mobility protocol ability reporting message, and the mobility protocol information that PGW is supported reports the ANDSF entity;

Insert the mobility protocol information that anchor point is supported in order in Diameter, to transmit, can in above-mentioned mobility protocol ability reporting message, carry a mobility protocol tabulation AVP, as MobileProtocolTypeList AVP, value is one or more MobileProtocolType, the value of MobileProtocolType is an enumerated value, specifically can choose from agreements such as PMIPv6, MIPv4, DSMIPv6 and GTP;

Can to obtain the mobility protocol information that PGW supports be that PMIPv6 adds DSMIPv6 to the ANDSF entity in the present embodiment;

804, UE moves to the area of the WiMax network coverage;

The ANDSF entity can determine that UE has entered the area of a WiMax network coverage according to the positional information of UE, because the WiMax network is a preferred network, so the ANDSF entity can determine whether to initiate network reselection to the WiMax network; The positional information of UE can report by UE, and perhaps other network element such as PGW report;

805, the ANDSF entity obtains the mobility protocol information of WiMax network support;

Carry out with reference to 504.In the present embodiment, the IAD control unit of target access network is the IAD in the WiMax network;

Can to obtain the mobility protocol of target WiMax network support be DSMIPv6 to the ANDSF entity in the present embodiment;

806, because UE only supports PMIPv6, and target WiMax network is only supported DSMIPv6, the ANDSF entity is not initiated network reselection to the WiMax network;

The mobility protocol PMIPv6 that the ANDSF entity is supported according to UE, mobility protocol PMIPv6 and DSMIPv6 that PGW supports, obtaining the mobility protocol that uses when terminal switches to the WiMax network is PMIPv6; Because the WiMax network is not supported PMIPv6, therefore, do not initiate network reselection to the WiMax network.

Wherein, 802 and 803 do not have the sequencing in the execution, only need 802 and 803 all to carry out the realization that can not influence present embodiment before 806.

Wherein, the ANDSF entity can not done to judge directly after obtaining the mobility protocol information of WiMax network support and is initiated network reselection to the WiMax network, network is found and selection strategy sends to UE that network discovery and selection strategy comprise the mobility protocol information (DSMIPv6) of the WiMax network information (as the sign of WiMax network etc.) and WiMax network support; Terminal can be determined not initiate network reselection to the WiMax network according to the information that network is found and selection strategy comprises.

From the above, present embodiment can obtain terminal and insert the mobility protocol that anchor point is supported, thereby obtain the mobility protocol that uses when terminal switches to the WiMax network, and can determine not initiate network reselection according to the mobility protocol of WiMax network support to the WiMax network, thereby can not insert the WiMax network when having avoided terminal to switch to the WiMax network, can improve user's impression.

Fig. 9 has described the signaling process of the network selecting method embodiment eight that the embodiment of the invention provides, the user uses multimode terminal in this embodiment, support 3GPP, the access of trusted non-3GPP access (WiMax network) and untrusted non-3GPP access (WiFi network), terminal is supported PMIPv6 and DSMIPv6; The WiMax network is the preferred network that exists under the service conditions, and the current access of terminal WiFi network carries out business, and the mobility protocol that uses at the WiFi network is PMIPv6.

901, UE inserts EPC by the IAD ePDG of WiFi network, and UE is PMIPv6 at the mobility protocol that the WiMax network uses;

902, the ANDSF entity obtains the mobility protocol information that UE supports;

Carry out with reference to 802.Can to obtain the mobility protocol information that UE supports be PMIPv6 and DSMIPv6 to the ANDSF entity in the present embodiment;

903, the ANDSF entity obtains and inserts the mobility protocol information that anchor point is supported, inserting anchor point in the present embodiment is PGW;

Carry out with reference to 803.In the present embodiment, the mobility protocol information that the ANDSF entity can obtain the PGW support is PMIPv6 and DSMIPv6;

904, UE moves to the area of the WiMax network coverage;

Carry out with reference to 804.

905, the ANDSF entity obtains the mobility protocol information of target WiMax network support;

Carry out with reference to 805.In the present embodiment, the mobility protocol information that the ANDSF entity obtains the WiMax network support is DSMIPv6;

906, because WiMax network support DSMIPv6 initiates network reselection to the WiMax network;

Mobility protocol PMIPv6 and DSMIPv6 that the ANDSF entity is supported according to UE, mobility protocol PMIPv6 and DSMIPv6 that PGW supports, operable mobility protocol tabulation comprises PMIPv6 and DSMIPv6 when obtaining terminal and switching to the WiMax network, because therefore WiMax network support DSMIPv6 can use DSMIPv6 to initiate network reselection to the WiMax network.

Further, the ANDSF entity can also be according to operator or user's preference, from the mobility protocol tabulation that may use, and the mobility protocol that uses when selecting terminal to switch to the WiMax network; Wherein, the ANDSF entity can obtain the mobility protocol of operator's preference by the method for configuration; The ANDSF entity can obtain user's preference by the method for configuration, also can obtain user's preference from UE.

Wherein, the ANDSF entity can not done to judge directly after obtaining the mobility protocol information of WiMax network support and is initiated network reselection to the WiMax network, network is found and selection strategy sends to UE that network discovery and selection strategy comprise the mobility protocol information (DSMIPv6) of the WiMax network information (as the sign of WiMax network etc.) and WiMax network support; Terminal can determine to use DSMIPv6 to initiate network reselection to the WiMax network according to the information that network is found and selection strategy comprises.

From the above, present embodiment can obtain terminal and insert the mobility protocol that anchor point is supported, thereby obtain the mobility protocol that uses when terminal switches to the WiMax network, and can determine to initiate network reselection according to the mobility protocol of WiMax network support to the WiMax network, thereby make terminal arrive preferred WiMax network by successful switch, can improve user's impression.

Introduce the network selection apparatus that the embodiment of the invention provides again, Figure 10 has described the structure of network selection apparatus embodiment one, comprising:

Acquiring unit 1001 is used to obtain the information of the mobility protocol that target access network supports; Obtain the mobility protocol that terminal is used when switching to this target access network;

Wherein, acquiring unit 1001 can comprise: first acquiring unit 10011 is used to obtain the information of terminal at the mobility protocol of current access network use; First determining unit 10012, the mobility protocol that the mobility protocol that the terminal that is used for determine using first acquiring unit 10011 to obtain is used at current access network uses when switching to target access network as terminal.

Determining unit 1002, the mobility protocol that the information of the mobility protocol that the target access network that is used for obtaining according to acquiring unit 1001 is supported and the terminal that acquiring unit 1001 (specifically can be first determining unit 10012) obtains are used when switching to target access network determines whether to initiate network reselection to target access network.

From the above, the present embodiment of network selection apparatus can obtain the mobility protocol that target access network is supported, and can obtain the mobility protocol that terminal is used when switching to target access network, thereby can be according to the information of the mobility protocol of target access network support and the mobility protocol that terminal is used when switching to target access network, determine whether to initiate network reselection to target access network, can not insert target access network in the time of can avoiding terminal to be directly switch into target access network, thereby improve user's impression.

As shown in figure 10, the network selection apparatus embodiment one that the embodiment of the invention provides can also comprise initiation unit 1003, be used for determining that in determining unit 1002 mobility protocol that the terminal of using acquiring unit 1001 to obtain is used is initiated network reselection to target access network when target access network is initiated network reselection when switching to target access network.

Figure 11 has described the structure of network selection apparatus embodiment two, comprising:

Acquiring unit 1101 is used to obtain the information of the mobility protocol that target access network supports; Obtain the mobility protocol that terminal is used when switching to this target access network;

Wherein, acquiring unit 1101 can comprise: second acquisition unit 11011, the information that is used to obtain the information of the mobility protocol that terminal supports and inserts the mobility protocol that anchor point supports; Second determining unit 11012, the information of the mobility protocol that the information of the mobility protocol that the terminal that is used for obtaining according to second acquisition unit 11011 is supported and access anchor point are supported, the mobility protocol that definite mobility protocol that uses terminal and access anchor point all to support uses when switching to target access network as terminal.

Determining unit 1102, the mobility protocol that the information of the mobility protocol that the target access network that is used for obtaining according to acquiring unit 1101 is supported and the terminal that acquiring unit 1101 (specifically can be second determining unit 11012) obtains are used when switching to target access network determines whether to initiate network reselection to target access network.

Selected cell 1103, be used for determining to initiate network reselection to target access network in determining unit 1002, and acquiring unit 1101 (specifically can be second determining unit 11012) obtains the mobility protocol that terminal uses when switching to target access network quantity is selected a mobility protocol during at least two from least two mobility protocols;

Initiate unit 1104, a mobility protocol that is used to use selected cell 1103 to select is initiated network reselection to target access network.

From the above, the present embodiment of network selection apparatus can obtain the mobility protocol that target access network is supported, and can obtain terminal and insert the mobility protocol that mobility protocol that anchor point all supports uses when switching to target access network as terminal, thereby only when the mobility protocol of target access network support has comprised terminal and insert the mobility protocol that anchor point all supports, just initiate network reselection to target access network, thereby can not insert target access network when avoiding terminal to be directly switch into target access network, can improve user's impression.

The network selection apparatus that the embodiment of the invention provides can be used as the ANDSF entity.

Introduce the terminal that the embodiment of the invention provides again, Figure 12 has described the structure of terminal embodiment one, comprising:

Receiving element 1201 is used to receive network and finds and selection strategy, and network discovery and selection strategy comprise the information of the mobility protocol that target access network is supported;

Determining unit 1202, the mobility protocol that mobility protocol that the target access network that is used for receiving according to receiving element is supported and terminal are supported determines whether to initiate network reselection to target access network.

From the above, the present embodiment of terminal can obtain the mobility protocol that target access network is supported, and can be according to the information of the mobility protocol of target access network support and the mobility protocol that terminal is used when switching to target access network, determine whether to initiate network reselection to target access network, thereby can not insert target access network when avoiding terminal to be directly switch into target access network, improve user's impression.

As shown in figure 12, the terminal embodiment one that provides of the embodiment of the invention can also comprise:

Initiate unit 1203, be used for determining when target access network is initiated network reselection that the mobility protocol of the terminal support that the mobility protocol of use target access network support is included is initiated network reselection to target access network in determining unit 1202.

Figure 13 has described the structure of terminal embodiment two, comprising:

Receiving element 1301 is used to receive network and finds and selection strategy, and this network discovery and selection strategy comprise the information of the mobility protocol that target access network is supported;

Determining unit 1302, the mobility protocol that mobility protocol that the target access network that is used for receiving according to receiving element is supported and terminal are supported determines whether to initiate network reselection to target access network;

Selected cell 1303, be used for determining to initiate network reselection to target access network in determining unit 1302, and the quantity of the mobility protocol of supporting during the target access network that receiving element 1301 receives is at least two, when this terminal is supported in these at least two mobility protocols at least two, from least two mobility protocols that this terminal is supported, select a mobility protocol;

Initiate unit 1304, a mobility protocol that is used to use selected cell 1203 to select is initiated network reselection to target access network.

From the above, the present embodiment of terminal can obtain the mobility protocol that target access network is supported, mobility protocol that thereby the mobility protocol that can use the target access network support comprises and the terminal support is initiated network reselection to target access network, thereby can guarantee that terminal can successfully switch to target access network, improve user's impression.

Figure 14 has described the structure of terminal embodiment three, comprising:

Receiving element 1401 is used to receive network and finds and selection strategy, and network discovery and selection strategy comprise the information of the mobility protocol that target access network is supported;

Determining unit 1402, mobility protocol that the target access network that is used for receiving according to receiving element 1401 is supported and terminal determine whether to initiate network reselection to target access network at the mobility protocol that current access network uses.

From the above, the present embodiment of terminal can obtain the mobility protocol that target access network is supported, and can be according to the mobility protocol of target access network support and the mobility protocol of terminal support, determine whether to initiate network reselection to target access network, can not insert target access network in the time of can avoiding terminal to be directly switch into target access network, improve user's impression.

As shown in figure 14, the terminal embodiment three that the embodiment of the invention provides can also comprise initiation unit 1403, be used for determining when target access network is initiated network reselection, to use terminal to initiate network reselection to target access network at the mobility protocol that current access network uses in determining unit 1402.

One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.

More than a kind of network selecting method, device and terminal that the embodiment of the invention provided are described in detail, the explanation of above embodiment just is used for help understanding method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. a network selecting method is characterized in that, comprising:

2. network selecting method as claimed in claim 1 is characterized in that, the step of the information of the described mobility protocol that obtains the target access network support comprises:

Obtain the information of the mobility protocol of described target access network support according to configuration information; Or

Obtain the information of the mobility protocol of target access network support from the IAD control unit of described target access network.

3. network selecting method as claimed in claim 2 is characterized in that, the step of information that described IAD control unit from target access network obtains the mobility protocol of target access network support comprises:

Directly obtain the information of the mobility protocol of target access network support from the IAD control unit of target access network; Or

Obtain the information of the mobility protocol of target access network support from the IAD control unit of target access network by the policy control functions entity.

4. as the arbitrary described network selecting method of claim 1 to 3, it is characterized in that, the information of described mobility protocol according to described target access network support and the mobility protocol that terminal is used when switching to described target access network determine whether that step from network reselection to described target access network that initiate comprises:

If the mobility protocol of described target access network support does not comprise the mobility protocol that terminal is used when switching to target access network, do not initiate network reselection to described target access network; Perhaps

If the mobility protocol of described target access network support comprises the mobility protocol that terminal is used when switching to described target access network, the mobility protocol that uses terminal to use when switching to described target access network is initiated network reselection to described target access network.

5. network selecting method as claimed in claim 4 is characterized in that, the mobility protocol that described terminal is used when switching to target access network comprises:

The mobility protocol that described terminal is used at current access network; Or

The mobility protocol that described terminal is supported; Or

The mobility protocol that the access anchor point that described terminal inserts is supported; Or

The mobility protocol that the access anchor point that described terminal and this terminal insert is all supported.

6. network selecting method as claimed in claim 5 is characterized in that, the described step of obtaining the mobility protocol that described terminal uses at current access network comprises:

Directly obtain the information of terminal at the mobility protocol of current access network use from described access anchor point; Or

Obtain the information of terminal by the policy control functions entity from described access anchor point at the mobility protocol of current access network use.

7. network selecting method as claimed in claim 5 is characterized in that, the described step of obtaining the mobility protocol of terminal support comprises:

Obtain the information of the mobility protocol of described terminal support according to configuration information; Or

Obtain the information of the mobility protocol of this terminal support from described terminal.

8. network selecting method as claimed in claim 5 is characterized in that, the described step of obtaining the mobility protocol of the access anchor point support that terminal inserts comprises:

Obtain the information of the mobility protocol of described access anchor point support according to configuration information; Or

Obtain the information of the mobility protocol of this access anchor point support from described access anchor point.

9. network selecting method as claimed in claim 4 is characterized in that the quantity of the mobility protocol that terminal is used is at least two when switching to described target access network;

If the mobility protocol of described target access network support only comprises a mobility protocol in described at least two mobility protocols, the step that the mobility protocol that described use terminal is used when switching to described target access network is initiated network reselection to described target access network comprises:

Use a described mobility protocol to initiate network reselection to described target access network;

Perhaps

If the mobility protocol of described target access network support comprises at least two mobility protocols in described at least two mobility protocols, the step that the mobility protocol that described use terminal is used when switching to described target access network is initiated network reselection to described target access network comprises:

Select a mobility protocol the mobility protocol that at least two terminals that comprise from the mobility protocol of described target access network support are used when switching to described target access network, use a mobility protocol of selecting to initiate network reselection to described target access network.

10. network selecting method as claimed in claim 9, it is characterized in that, select the step of a mobility protocol to comprise at least the mobility protocol that two terminals that described mobility protocol from the target access network support comprises are used when switching to described target access network:

The mobility protocol that at least two terminals that comprise from the mobility protocol of target access network support are used, select a mobility protocol at random when switching to described target access network; Or

The mobility protocol that at least two terminals that comprise from the mobility protocol of target access network support are used, select a mobility protocol according to user's preference when switching to described target access network; Or

The mobility protocol that at least two terminals that comprise from the mobility protocol of target access network support are used, select a mobility protocol according to the preference of operator when switching to described target access network.

11. a network selecting method is characterized in that, comprising:

12. network selecting method as claimed in claim 11, it is characterized in that, the described mobility protocol of supporting according to the mobility protocol and the terminal of described target access network support determines whether that step from network reselection to described target access network that initiate comprises:

If the mobility protocol of described target access network support does not comprise the mobility protocol that terminal is supported, do not initiate network reselection to described target access network; Or

If the mobility protocol of described target access network support comprises the mobility protocol that terminal is supported, the mobility protocol that the included terminal of the mobility protocol that uses target access network to support is supported is initiated network reselection to described target access network.

13. network selecting method as claimed in claim 12 is characterized in that, the mobility protocol that the included terminal of the mobility protocol that target access network is supported is supported is at least two;

The step that the mobility protocol of the terminal support that the mobility protocol of described use target access network support is included is initiated network reselection to described target access network comprises:

From described two mobility protocols, select a mobility protocol at least, use a described mobility protocol to initiate network reselection to described target access network.

14. network selecting method as claimed in claim 13 is characterized in that, the described step of a mobility protocol of selecting from least two mobility protocols comprises:

From described two mobility protocols, select a mobility protocol at random at least; Or

Preference according to the user is selected a mobility protocol at least from described two mobility protocols.

15. a network selecting method is characterized in that, comprising:

16. network selecting method as claimed in claim 15, it is characterized in that, described mobility protocol of supporting according to target access network and terminal determine whether that at the mobility protocol that current access network uses step from network reselection to described target access network that initiate comprises:

If the mobility protocol of described target access network support comprises terminal at the mobility protocol that current access network uses, use described terminal to initiate network reselection to described target access network at the mobility protocol that current access network uses; Or

If the mobility protocol of described target access network support does not comprise the mobility protocol that terminal is used at current access network, do not initiate network reselection to described target access network.

17. a network selection apparatus is characterized in that, comprising:

18. network selection apparatus as claimed in claim 17 is characterized in that, also comprises:

Initiate the unit, be used for determining that in described determining unit the mobility protocol that the terminal of using described acquiring unit to obtain is used is initiated network reselection to described target access network when described target access network is initiated network reselection when switching to described target access network.

19. network selection apparatus as claimed in claim 18 is characterized in that, also comprises:

Selected cell, the quantity that is used for obtaining the mobility protocol that terminal uses at described acquiring unit when switching to target access network are selected a mobility protocol during at least two from least two mobility protocols;

Described initiation unit, a mobility protocol that is used to use described selected cell to select is initiated network reselection to described target access network.

20., it is characterized in that described acquiring unit comprises as the arbitrary described network selection apparatus of claim 17 to 19:

First acquiring unit is used to obtain the information of described terminal at the mobility protocol of current access network use;

First determining unit, the mobility protocol that the mobility protocol that the terminal that is used for determine using described first acquiring unit to obtain is used at current access network uses when switching to target access network as terminal.

21., it is characterized in that described acquiring unit comprises as the arbitrary described network selection apparatus of claim 17 to 19:

Second acquisition unit is used to obtain the information of the mobility protocol that described terminal supports and the information of the mobility protocol that described access anchor point is supported;

Second determining unit, the information of the mobility protocol that the information of the mobility protocol that the terminal that is used for obtaining according to described second acquisition unit is supported and described access anchor point are supported, the mobility protocol that definite mobility protocol that uses described terminal and described access anchor point all to support uses when switching to described target access network as terminal.

22. a terminal is characterized in that, comprising:

23. terminal as claimed in claim 22 is characterized in that, also comprises:

Initiate the unit, be used for determining when described target access network is initiated network reselection that the mobility protocol that the included described terminal of the mobility protocol that uses target access network to support is supported is initiated network reselection to described target access network in described determining unit.

24. terminal as claimed in claim 23 is characterized in that, also comprises:

Selected cell, the quantity of the mobility protocol of supporting during the target access network that is used for receiving at described receiving element is at least two, and when described terminal is supported in these at least two mobility protocols at least two, from least two mobility protocols, select a mobility protocol;

25. a terminal is characterized in that, comprising:

26. terminal as claimed in claim 25 is characterized in that, also comprises:

Initiate the unit, be used for determining when described target access network is initiated network reselection, use described terminal to initiate network reselection to described target access network at the mobility protocol that current access network uses in described determining unit.