CN104717723A - Access network selection method and system - Google Patents
Access network selection method and system Download PDFInfo
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- CN104717723A CN104717723A CN201310671484.8A CN201310671484A CN104717723A CN 104717723 A CN104717723 A CN 104717723A CN 201310671484 A CN201310671484 A CN 201310671484A CN 104717723 A CN104717723 A CN 104717723A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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Abstract
The embodiment of the invention discloses an access network selection method and a system. The method comprises steps: according to service currently accessed by UE (user equipment), a service platform sends a network switching request message to an AF (application function) unit; after the AF unit receives the network switching request message, the network switching request message is sent to an ANDSF (access network discovery support function) unit; and after the ANDSF unit receives the network switching request message, a network switching strategy is generated according to the network switching request message, and the network switching strategy is sent to the UE; and after the UE receives the network switching strategy, whether network switching is carried out is judged according to the network switching strategy, and handling is carried out according to the judgment result. According to the embodiment of the invention, independent, targeted and selective dynamic access network selection can be realized, and effects of access network selection are improved.
Description
Technical field
The present invention relates to the communication technology, particularly relate to a kind of access network selecting method and system.
Background technology
Along with 3G business, intelligent terminal universal, the demand of user in mobile communication has no longer been confined to voice and short message class, and the propagation of high definition picture, high-quality voice, video is more and more wider, and cellular network thing followed increasing pressure is large.
If in areal, there is multiple access network simultaneously, as: WLAN(WirelessLocal Area Networks, WLAN) and 3G access network, and the network quality of WLAN is obviously better than 3G access network, transmission bandwidth is apparently higher than 3G access network, so, just this type of can there be is the Business Stream of high bandwidth requirements to introduce non-3 gpp (3rdGeneration Partnership Project, third generation partner program) access network, while alleviating cellular network pressure, improve user's high bandwidth business experience, for user saves the service traffics of cellular network.For this reason, 3GPP is organized in R8 version and defines ANDSF(Access Network Discovery Support Functions, access network discovery and selection function) unit, providing a kind of is UE(User Equipment according to carrier policy, subscriber equipment) pattern of select target access network.
According to each carrier policy, ANDSF unit includes necessary data management and controlling functions, for providing the strategy helping access network discovery and selection.ANDSF unit dynamically provides access network discovery and selection strategy to UE, and the presentation mode of strategy has two kinds: a kind of mode is Pull mode, and by UE initiation session, to ANDSF unit requests access network discovery and selection strategy, ANDSF unit must respond.Another kind is Push mode, triggering Network Based or early stage the result that communicate with UE, ANDSF unit can active initiation session, to UE transmission access network discovery and selection strategy.
Realizing in process of the present invention, inventor finds that said method at least exists following problem: the triggering main body of access network discovery and selection course is currently only UE or ANDSF unit, this ability is not supplied to other platforms.By UE or ANDSF unit triggers access network discovery and selection course, not for the service condition of user's current business, not pointed and selectivity.
Summary of the invention
Embodiment of the present invention technical problem to be solved is: by UE or ANDSF unit triggers access network discovery and selection course, not for the service condition of user's current business, not pointed and selectivity, provides a kind of access network selecting method and system.
A kind of access network selecting method that the embodiment of the present invention provides, comprising:
Business platform, according to the business of user equipment (UE) current accessed, sends network switching request message to application function AF unit;
Described AF unit receives described network switching request message, and described network switching request message is sent to access network discovery and selection function ANDSF unit;
Described ANDSF unit receives described network switching request message, according to described network switching request message generation network switchover policy, described network switchover policy is sent to described UE;
Described UE receives described network switchover policy, judges whether to carry out network switching, process according to judged result according to described network switchover policy.
A kind of access network selective system that the embodiment of the present invention provides, comprising: business platform, application function AF unit, access network discovery and selection function ANDSF unit and user equipment (UE);
Described business platform, for the business according to described UE current accessed, sends network switching request message to described AF unit;
Described AF unit, for receiving described network switching request message, sends to described ANDSF unit by described network switching request message;
Described ANDSF unit, for receiving described network switching request message, according to described network switching request message generation network switchover policy, sends to described UE by described network switchover policy;
Described UE, for receiving described network switchover policy, judging whether to carry out network switching according to described network switchover policy, processing according to judged result.
There is provided based on the above embodiment of the present invention, compared with prior art, the access network selecting method that the embodiment of the present invention provides and system, AF unit is introduced in 3GPP network, by the trigger condition opening of the access network discovery of ANDSF unit and selection to business platform, the situation of business is used to determine whether be necessary that initiating network selects flow process by business platform according to user, network side ability is combined with the business platform of application layer, achieve independence, targetedly (user class), selectively (service level) Access Network Dynamic Selection, improve the effect that access network is selected.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
What form a part for specification drawings describes embodiments of the invention, and is used from explanation principle of the present invention together with description one.
With reference to accompanying drawing, according to detailed description below, clearly the present invention can be understood, wherein:
Fig. 1 is the flow chart of an access network selecting method of the present invention embodiment.
Fig. 2 is the flow chart of another embodiment of access network selecting method of the present invention.
Fig. 3 is a Signalling exchange schematic diagram of access network selecting method embodiment of the present invention.
Fig. 4 is the flow chart of another embodiment of access network selecting method of the present invention.
Fig. 5 is the structural representation of an access network selective system of the present invention embodiment.
Embodiment
Various exemplary embodiment of the present invention is described in detail now with reference to accompanying drawing.It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part for specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
Fig. 1 is the flow chart of an access network selecting method of the present invention embodiment.As shown in Figure 1, the access network selecting method that the embodiment of the present invention provides specifically can be applied to the switching selection course of access network, is realized by access network selective system.This access network selective system comprises business platform, AF(Application Function, application function) unit, ANDSF(Access Network Discovery Support Functions, access network discovery and selection function) unit and UE(User Equipment, subscriber equipment).UE is specifically as follows the mobile terminals such as smart mobile phone, panel computer, notebook computer.This access network selecting method specifically comprises the steps:
Step 10, business platform, according to the business of user equipment (UE) current accessed, send network switching request message to application function AF unit;
Step 20, described AF unit receive described network switching request message, and described network switching request message is sent to access network discovery and selection function ANDSF unit;
Step 30, described ANDSF unit receive described network switching request message, according to described network switching request message generation network switchover policy, described network switchover policy are sent to described UE;
Step 40, described UE receive described network switchover policy, judge whether to carry out network switching, process according to judged result according to described network switchover policy.
Particularly, business platform can be application layer third party business platform, can provide one or more business for user.UE is upper can be provided with corresponding client, and user is by the related service on the client-access business platform on UE, and e.g., UE accesses 3GPP network, access service platform.Business platform is important perception unit user being used to certain Business Stream immediate status, (user class), selectively (service level) perception user in all directions can use the state of this business targetedly.Therefore, business platform according to the concrete condition of the business of UE current accessed, can judge whether the switching selection course of triggering access network network.In one implementation, business platform can use the situation of business to judge according to user, such as, consider the information of UE, the type of business and the transmission rate etc. between this UE and business platform.If bandwidth requirement is higher needed for the business of UE current accessed, the transmission rate between UE with business platform is lower again, then can send network switching request message to AF unit.In actual implementation procedure, business platform can also point out user the handover operation the need of carrying out access network by client end interface, if user agrees to carry out network switching, then sends network switching request message to AF unit.Access network can be comprised in network switching request message and switch the parameter selected needed in processing procedure, such as user ID and type of service etc.User ID, in order to indicate UE, can be the IP(Internet Protocol of UE, the agreement interconnected between network) address, MDN(Mobile Directory Number, Mobile Directory Number) etc.Type of service, in order to indicate the type of the business of UE current accessed, can be video (video), voice (voice) etc.
AF unit is specially the open gateway of ability between ANDSF unit and business platform, arranges by AF unit the information interaction realized between ANDSF unit and business platform.The network switching request message received from business platform is sent to ANDSF unit by AF unit.ANDSF unit, according to network switching request match messages local network switchover policy, generates corresponding network switchover policy, and this network switchover policy is sent to UE.UE judges whether to carry out network switching according to this network switchover policy, this basis for estimation is specifically as follows UE and checks whether the network quality of target access network meets default switching condition, to determine whether carry out network switching, if need to carry out network to switch, perform corresponding hand-off process, realize the switching from 3GPP network to non-3 GPP network, if do not needed, then refuse to switch.
The access network selecting method that the present embodiment provides, AF unit is introduced in 3GPP network, by the trigger condition opening of the access network discovery of ANDSF unit and selection to business platform, the situation of business is used to determine whether be necessary that initiating network selects flow process by business platform according to user, network side ability is combined with the business platform of application layer, achieve independence, (user class), selectively (service level) Access Network Dynamic Selection targetedly, improve the effect that access network is selected.
Fig. 2 is the flow chart of another embodiment of access network selecting method of the present invention.As shown in Figure 2, in the present embodiment, step 40, described UE judges whether to carry out network switching according to described network switchover policy, processes, be specifically as follows according to judged result:
Described UE is according to described network switchover policy, check whether target access network quality meets default switching condition, if, then the Business Stream of described business is switched to described target access network, generate the switching result in order to indicate handover success, if not, then refusal switches to described target access network, generates the switching result indicating handoff failure.
Correspondingly, described method can also comprise the steps:
Described switching result is sent to described ANDSF unit by step 50, described UE;
Step 60, described ANDSF unit receive described switching result, are carried at by described switching result in network switching response message and send to described AF unit;
Step 70, described AF unit receive described network switching response message, and described network switching response message is sent to described business platform.
Particularly, the network switchover policy that UE issues according to ANDSF unit, check whether target access network quality meets default switching condition, if, then the Business Stream of business is switched to this target access network, and generate the switching result in order to indicate handover success, if not, then refusal switches to this target access network, generates the switching result indicating handoff failure.This switching result can represent in several ways, such as character string identification, and " Success " represents handover success, and " Failure " represents that refusal switches, or is bit mark, and " 1 " represents handover success, and " 0 " represents that refusal switches.The representation of switching result can be made an appointment by UE and ANDSF unit, is not limited with the present embodiment.
This switching result is fed back to ANDSF unit by UE, and this switching result is being carried in network switching response message by ANDSF unit, and issue business platform by AF unit, business platform processes accordingly again.
In the present embodiment, described AF unit handling capacity open interface communicates with described business platform, and described AF unit is by Rxa interface and described ANDSF unit communication.
In the implementation procedure of reality, by (south orientation) Rxa Interface realization interacting message between AF unit and ANDSF unit, between AF unit and business platform, realize interacting message by (north orientation) ability open interface.
Ability open interface is used for interactive application level session information between business platform and AF unit, and these information send ANDSF unit to by the Rxa interface of AF unit south orientation again, carry out the input of network switchover policy decision-making for ANDSF unit.On the one hand, the network switching request message of business platform is supplied to ANDSF unit by ability open interface, as: apply for as certain video flowing provides the access network handover request of service level; On the other hand, ability open interface will receive from the network switching response message of ANDSF unit.
Rxa interface is used for interactive sessions information between AF unit and ANDSF unit.On the one hand, the network switching request message of business platform is supplied to ANDSF unit by Rxa interface; On the other hand, Rxa interface will receive from the network switching response message of ANDSF unit.
In the present embodiment, described ability open interface adopts Simple Object Access Protocol, and described Rxa interface adopts Diameter.
Correspondingly, step 20, described AF unit receives described network switching request message, described network switching request message is sent to access network discovery and selection function ANDSF unit, is specifically as follows:
Described AF unit receives described network switching request message by described ability open interface, after carrying out protocol adaptation process, sends to described ANDSF unit by described Rxa interface to described network switching request message.
Step 70, described AF unit receives described network switching response message, described network switching response message is sent to described business platform, is specifically as follows:
Described AF unit, by network switching response message described in described Rxa interface, after carrying out protocol adaptation process, sends to described business platform by described ability open interface to described network switching response message.
Particularly, Rxa interface uses Diameter as its interface protocol, ability open interface, and ((Simple Object Access Protocol is called for short SOAP) is as interface protocol to use Simple Object Access Protocol.AF unit achieves the translation function of the SOAP of the Diameter ability open interface of Rxa interface.After the network switching request message received from ability open interface is carried out protocol conversion by AF unit, then sent by Rxa interface.Same, from Rxa interface to network switching response message, AF unit also can to its carry out agreement turn after again handling capacity open interface send.
Fig. 3 is a Signalling exchange schematic diagram of access network selecting method embodiment of the present invention.Below in conjunction with Fig. 3, the session flow process of Rxa interface and power open interface is described.
Step 31, business platform send network switching request (NetworkChangeRequest) message to AF unit, user ID (as: IP address, MDN etc.) is contained, type of service (as: video, voice) in NetworkChangeRequest message;
Step 32, AF unit carry out protocol adaptation, are encapsulated as AAR message and send to ANDSF unit;
Step 33, ANDSF unit and UE consult network switchover policy, by AAA message, switching result are fed back to AF unit;
Step 34, AF unit receive after the response of ANDSF unit, send network handoff response (NetworkChangeResponse) message to business platform, carry in NetworkChangeResponse message switching result mark (as: 1, Success; 2, Failure).
In the present embodiment, described UE is by S14 interface and described ANDSF unit communication.
Particularly, by S14 Interface realization interacting message between UE and ANDSF unit, the protocol type that S14 interface adopts specifically can with reference to existing techniques in realizing.
Fig. 4 is the flow chart of another embodiment of access network selecting method of the present invention.Below in conjunction with Fig. 4, the access network selecting method of the present embodiment is described in detail.
Step 41, user use mobile terminal to access 3GPP network, the related service of access service platform, business platform detects that active user's access rate is poor, and by client end interface prompting user the need of the handover operation carrying out access network, user agrees to carry out network switching;
Step 42, business platform propose network switching request by AF unit to ANDSF unit, and namely business platform handling capacity open interface initiates network switching request to AF unit, and message is NetworkChangeRequest;
Step 43, AF unit forwards network switching request are to ANDSF unit, and the AAR message that namely soap message of capability development interface is converted to Rxa interface Diameter by AF unit sends to ANDSF unit;
The network switchover policy of step 44, ANDSF units match this locality, is handed down to the client of mobile terminal by S14 interface by network switching request;
The network switchover policy that step 45, mobile terminal issue according to ANDSF unit, checks whether target access network quality meets the preset switching condition of mobile terminal; If "Yes", then perform step 46; If "No", then perform step 47;
Specified services stream is switched to target access network by step 46, mobile terminal, simultaneously by the response of S14 interface feedback network handover success, performs step 48;
Step 47, mobile terminal refusal access network switches, and simultaneously by the response of S14 interface feedback network handoff failure, performs step 48;
Network switching result is fed back to AF unit by the AAA message by Rxa interface after step 48, ANDSF unit receive network handoff response, and network switching result is the response of above-mentioned network handover success or the response of network handoff failure;
Network switching result is fed back to business platform by the NetworkChangeResponse message of step 49, AF unit handling capacity open interface, business platform process network switching result.
Embodiments provide a kind of method that dynamic network realizing service level based on AF unit switches, by the access network discovery of ADNSF unit and selective power opening to third party's business platform of application layer.On this basis, still UE or ANDSF unit triggers access network discovery and selection course can also be passed through.Namely according to each carrier policy, ANDSF unit still can include necessary data management and controlling functions, helps access network discovery and selection strategy for providing.Under the request of UE, access network discovery and selection strategy can be sent to UE, also can triggering Network Based or early stage the result that communicate with UE, active is to UE transmission related data.
Under roaming scence, the ANDSF unit of ownership place is referred to as H-ANDSF unit, and the ANDSF unit of roaming place is referred to as V-ANDSF unit.
According to demand and the Roaming agreements of operator, shift strategy between H-ANDSF Unit selection corresponding system, between access network discovery information and system, routing policy sends to UE.If H-ANDSF unit knows the permanent identification of UE, H-ANDSF unit also can select shift strategy between corresponding system according to available CAMEL-Subscription-Information, routing policy between access network discovery information and system.
According to demand and the Roaming agreements of operator, shift strategy between V-ANDSF Unit selection corresponding system, between access network discovery information and system, routing policy sends to UE.
If UE to have between the effective access network discovery information of current location, system routing policy between shift strategy or system, and this information indicates, the access network higher than the current access network priority selected is had near UE, if user preference allows, then UE should initiate a discovery and the process from the higher access network of selection priority.
If UE can be routed to multiple wireless interface entrances IP flow simultaneously, UE can to receive between system routing policy between shift strategy and system from ANDSF unit.In addition, UE should according to the filtering rule comprised in routing policy between system and user preference, and route meets the service traffics of ad hoc rules.
UE passes through S14 interface and ANDSF unit is mutual, can being undertaken by non-seamless WLAN shunt or any 3GPP/non-3GPP access technology alternately of UE and ANDSF unit.
S14 interface is the interface of UE respectively and between H-ANDSF unit or V-ANDSF unit, and this S14 interface is used for dynamically to the information that UE provides access network discovery relevant with selection.S14 interface protocol realizes on IP, and runs under the security mechanism defined in TS33.402.
The following three kinds of access network discoveries of transmission and selection strategy on S14 interface:
One is, cross-system mobility strategy.Cross-system mobility strategy is rule and the preference information of a series of operator's definition for affecting the decision-making of UE cross-system mobility.UE can utilize cross-system mobility strategy to carry out: i) determine when allow or limit cross-system mobility; Ii) most suitable access network is selected.
Another kind is, access network discovery information.When receiving UE request, ANDSF unit can provide that UE asks, the access network information of all access technologies available near it.The access network information that ANSDF unit provides comprises: i) access technology type, as WLAN; Ii) Radio Access Network mark, as the SSID(Service SetIdentifier of WLAN, service set).
Another is, cross-system routing policy.ANDSF unit can provide the strategy carrying out cross-system route.UE uses cross-system routing policy to determine: i) select a kind of access technology or access network for a specific IP stream; Ii) optimum access technology or access network is selected when a specific condition is satisfied.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Fig. 5 is the structural representation of an access network selective system of the present invention embodiment.As shown in Figure 5, the access network selective system that the embodiment of the present invention provides specifically can realize each step of the access network selecting method that any embodiment of the present invention provides, and specific implementation process, does not repeat them here.The access network selective system that the present embodiment provides, specifically comprises: business platform 51, application function AF unit 52, access network discovery and selection function ANDSF unit 53 and user equipment (UE) 54.Described business platform 51, for the business according to described UE54 current accessed, sends network switching request message to described AF unit 52.Described AF unit 52, for receiving described network switching request message, sends to described ANDSF unit 53 by described network switching request message.Described ANDSF unit 53, for receiving described network switching request message, according to described network switching request message generation network switchover policy, sends to described UE54 by described network switchover policy.Described UE54, for receiving described network switchover policy, judging whether to carry out network switching according to described network switchover policy, processing according to judged result.
The access network selective system that the present embodiment provides, AF unit 52 is introduced in 3GPP network, by the trigger condition opening of the access network discovery of ANDSF unit 53 and selection to business platform 51, the situation of business is used to determine whether be necessary that initiating network selects flow process by business platform 51 according to user, network side ability is combined with the business platform 51 of application layer, achieve independence, (user class), selectively (service level) Access Network Dynamic Selection targetedly, improve the effect that access network is selected.
In the present embodiment, described UE54 specifically may be used for according to described network switchover policy, check whether target access network quality meets default switching condition, if, then the Business Stream of described business is switched to described target access network, generate the switching result indicating handover success, if not, then refusal switches to described target access network, generates the switching result indicating handoff failure.Described UE54 can also be used for described switching result to send to described ANDSF unit 53.Described ANDSF unit 53 can also be used for receiving described switching result, is carried at by described switching result in network switching response message and sends to described AF unit 52.Described AF unit 52 can also be used for receiving described network switching response message, and described network switching response message is sent to described business platform 51.
In the present embodiment, described AF unit 52 handling capacity open interface I1 communicates with described business platform 51, and described AF unit 52 is communicated with described ANDSF unit 53 by Rxa interface I2.
In the present embodiment, described ability open interface I1 adopts Simple Object Access Protocol, and described Rxa interface I2 adopts Diameter.Correspondingly, described AF unit 52 specifically may be used for receiving described network switching request message by described ability open interface I1, after carrying out protocol adaptation process, sends to described ANDSF unit 53 by described Rxa interface I2 to described network switching request message; Receive described network switching response message by described Rxa interface I2, after protocol adaptation process is carried out to described network switching response message, send to described business platform 51 by described ability open interface I1.
In the present embodiment, described UE54 is communicated with described ANDSF unit 53 by S14 interface I3.
In this specification, each embodiment all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, same or analogous part cross-reference between each embodiment.For system embodiment, because itself and embodiment of the method are substantially corresponding, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Claims (10)
1. an access network selecting method, is characterized in that, comprising:
Business platform, according to the business of user equipment (UE) current accessed, sends network switching request message to application function AF unit;
Described AF unit receives described network switching request message, and described network switching request message is sent to access network discovery and selection function ANDSF unit;
Described ANDSF unit receives described network switching request message, according to described network switching request message generation network switchover policy, described network switchover policy is sent to described UE;
Described UE receives described network switchover policy, judges whether to carry out network switching, process according to judged result according to described network switchover policy.
2. access network selecting method according to claim 1, is characterized in that, described UE judges whether to carry out network switching according to described network switchover policy, processes, be specially according to judged result:
Described UE is according to described network switchover policy, check whether target access network quality meets default switching condition, if, then the Business Stream of described business is switched to described target access network, generate the switching result in order to indicate handover success, if not, then refusal switches to described target access network, generates the switching result indicating handoff failure;
Described method also comprises:
Described switching result is sent to described ANDSF unit by described UE;
Described ANDSF unit receives described switching result, is carried at by described switching result in network switching response message and sends to described AF unit;
Described AF unit receives described network switching response message, and described network switching response message is sent to described business platform.
3. access network selecting method according to claim 2, is characterized in that, described AF unit handling capacity open interface communicates with described business platform, and described AF unit is by Rxa interface and described ANDSF unit communication.
4. access network selecting method according to claim 3, is characterized in that: described ability open interface adopts Simple Object Access Protocol, and described Rxa interface adopts Diameter;
Described AF unit receives described network switching request message, described network switching request message is sent to access network discovery and selection function ANDSF unit, is specially:
Described AF unit receives described network switching request message by described ability open interface, after carrying out protocol adaptation process, sends to described ANDSF unit by described Rxa interface to described network switching request message;
Described AF unit receives described network switching response message, described network switching response message is sent to described business platform, is specially:
Described AF unit, by network switching response message described in described Rxa interface, after carrying out protocol adaptation process, sends to described business platform by described ability open interface to described network switching response message.
5. access network selecting method according to claim 2, is characterized in that: described UE is by S14 interface and described ANDSF unit communication.
6. an access network selective system, is characterized in that, comprising: business platform, application function AF unit, access network discovery and selection function ANDSF unit and user equipment (UE);
Described business platform, for the business according to described UE current accessed, sends network switching request message to described AF unit;
Described AF unit, for receiving described network switching request message, sends to described ANDSF unit by described network switching request message;
Described ANDSF unit, for receiving described network switching request message, according to described network switching request message generation network switchover policy, sends to described UE by described network switchover policy;
Described UE, for receiving described network switchover policy, judging whether to carry out network switching according to described network switchover policy, processing according to judged result.
7. access network selective system according to claim 6, is characterized in that:
Described UE is specifically for according to described network switchover policy, check whether target access network quality meets default switching condition, if, then the Business Stream of described business is switched to described target access network, generate the switching result in order to indicate handover success, if not, then refusal switches to described target access network, generates the switching result indicating handoff failure;
Described UE is also for sending to described ANDSF unit by described switching result;
Described switching result, also for receiving described switching result, being carried in network switching response message and sending to described AF unit by described ANDSF unit;
Described network switching response message also for receiving described network switching response message, is sent to described business platform by described AF unit.
8. access network selective system according to claim 7, is characterized in that: described AF unit handling capacity open interface communicates with described business platform, and described AF unit is by Rxa interface and described ANDSF unit communication.
9. access network selective system according to claim 8, is characterized in that: described ability open interface adopts Simple Object Access Protocol, and described Rxa interface adopts Diameter;
Described AF unit, specifically for receiving described network switching request message by described ability open interface, after carrying out protocol adaptation process, sends to described ANDSF unit by described Rxa interface to described network switching request message; By network switching response message described in described Rxa interface, after protocol adaptation process is carried out to described network switching response message, send to described business platform by described ability open interface.
10. access network selective system according to claim 6, is characterized in that: described UE is by S14 interface and described ANDSF unit communication.
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