CN101730172A - Switching method and device based on access network selection - Google Patents
Switching method and device based on access network selection Download PDFInfo
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Abstract
The invention discloses a switching method based on access network selection, comprising the following steps: a user terminal accessed in an evolution packet system EPS initiates a request for acquiring access network information of the access networks capable of being switched and accessed by the user terminal currently to the access network discovering and selecting function ANDS entity before network switching; the ANDS entity determines the access networks which can be switched and accessed by the user terminal currently for the user terminal and trust information of the access networks, and notifies the user terminal of the access networks which can be switched and accessed by the user terminal and the trust information of the access networks; and the user terminal selects an access network in the access networks capable of being switched and accessed and then is accessed. The invention discloses a switching device based on access network selection simultaneously. Trust information of the accessible access networks is determined before UE is accessed, thus ensuring that the UE service can be smoothly and rapidly accessed after the access network is selected.
Description
Technical field
The present invention relates to the handoff technique between a plurality of access networks, relate in particular to a kind of changing method and device based on access network selection.
Background technology
Third generation partner program (3GPP, 3rd Generation Partnership Project) grouping system (EPS of evolution, Evolved Packet System) by the universal mobile telecommunications system land radio access web (E-UTRAN of evolution, Evolved Universal Terrestrial Radio Access Network), mobile management unit (MME, Mobility Management Entity), gateway (S-GW, ServingGateway), grouped data network gateway (P-GW or PDN GW, Packet Data NetworkGateway), home subscriber server (HSS, Home Subscriber Server), "Policy and Charging Rules Function (PCRF, Policy and Charging Rule Function) entity and other support nodes are formed.
Fig. 1 is the composition structural representation of EPS system architecture, and as shown in Figure 1, the EPS system supports the intercommunication with non-3 GPP system, wherein, passes through the S2a/S2b/S2c interface with the intercommunication of non-3 GPP system and realizes that the anchor point between 3GPP and non-3 GPP system is P-GW.Non-3 GPP system is divided into trusted non-3GPP IP Access Network and trustless non-3GPP IP Access Network.The non-3GPP IP of trusted Access Network can directly be connected with P-GW by the S2a interface, and it supports proxy-mobile IP (PMIP, Proxy Mobile IP) agreement and this 4 (MIPv4) agreement of hierarchical mobile IP.Trustless non-3GPP IP Access Network need link to each other with P-GW through the packet data gateway (ePDG, Evolved Packet Data Gateway) of evolution, and the interface between ePDG and P-GW is S2b, and it supports the PMIP agreement.S2c provides UE and user's face relevant control and mobility support between the P-GW, and the mobility management protocol of its support is for supporting the mobile IP v 6 (DSMIPv6, Moblie IPv6Support for Dual Stack Host and Router) of two stacks.
As shown in Figure 1, MME is responsible for the related work of chains of command such as the processing of mobile management, Non-Access Stratum signaling and the contextual management of user's mobile management; S-GW is the accessing gateway equipment that links to each other with E-UTRAN, transmits data between E-UTRAN and P-GW, and is responsible for pending datas such as paging are carried out buffer memory; P-GW then is the borde gateway of EPS and packet data network (PDN, Packet Data Network), and the access of being responsible for PDN reaches functions such as transmitting data between EPS and PDN; The PCRF entity is the "Policy and Charging Rules Function entity, it is by receiving interface Rx and the Internet protocol (IP of operator, Internet Protocol) business network links to each other, to obtain corresponding business information, in addition, the PCRF entity also links to each other with gateway device in the network by the Gx/Gxa/Gxc interface, be responsible for initiating the foundation of IP carrying, guarantee the service quality (QoS, Quality ofService) of business datum, and the control of chargeing.
In existing EPS system, access network discovery and selection function (ANDSF have been used, AccessNetwork Discovery and Selection Function) entity, the ANDSF entity comprises data management and controlled function, and its effect is to provide network to find and the auxiliary data of selecting according to carrier policy.The ANDSF entity provides two kinds of information, is respectively shift strategy and access network discovery information between system.According to the demand of operator, the ANDSF entity can provide aforementioned two kinds of information or any information wherein simultaneously.
Fig. 2 is the application structure schematic diagram of ANDSF entity, as shown in Figure 2, user terminal (UE) inserts the ANDSF entity by 3GPP Access Network/non-3 GPP access network and S14 interface, wherein, the S14 interface is the interface between 3GPP Access Network/non-3 GPP access network and the ANDSF entity, and the S14 interface is supported PULL and PUSH pattern.PULL pattern wherein is that UE carries out the active application to network, triggers the ANDSF entity and sends the network information to UE.And the PUSH pattern mainly is initiatively to be triggered to UE by network to send data.
According to prior art, UE can insert EPS by non-3 GPP access network, but not the 3GPP Access Network is divided into 3GPP Access Network trusty and fly-by-night non-3 GPP access network again.Non-3 GPP access network to UE belong to the EPS network and whether trust, whether the operator that depends primarily on two networks reaches signatory agreement.And in the prior art, as shown in Figure 1, ownership EPS network can carry out dynamic resource and charge control the non-3 GPP access network of trusting, and passs strategy and charges control (PCC, Policy and Charging Control) strategy by the Gxa oral instructions; And can't carry out dynamic resource and the control of chargeing to fly-by-night non-3 GPP access network.
According to prior art, UE can directly initiate to adhere to request when inserting non-3 GPP access network trusty, be the access authentication of user process then, sets up PDN subsequently and connects, and finishes and adheres to; But when UE has selected a fly-by-night non-3 GPP access network to insert, because UE does not also know whether this Access Network is trusty, UE will arrive first and carry out access authentication in this Access Network so, in access authentication procedure, network side informs that the current Access Network of terminal is fly-by-night, UE initiates to insert request again from this access network selection ePDG again according to the access way of fly-by-night Access Network then; So just because UE does not know the trust information of Access Network, the process that exists " test " to insert is disadvantageous to switching efficiency and business continuance.And if UE is knowing that this Access Network is Access Network trusty or fly-by-night Access Network when an Access Network inserts, particularly when UE knows that the Access Network that is inserted is Access Network trusty, directly select ePDG to set up the IPsec tunnel, carry out service access and get final product.
UE is to wish to know whether several networks that current region has wireless signal to cover are trusty or fly-by-night when non-3 GPP access network switches, and UE can select oneself to wish most that access network inserts like this.At present, because network integration technology still is in talking stage, do not solve the related art scheme of foregoing problems.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of changing method and device based on access network selection, carry out in time to notify the UE trust information of the current Access Network that can insert when network switches at UE, make UE be linked into selected Access Network more quickly.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of changing method based on access network selection comprises:
Having inserted user terminal among the grouping system EPS of evolution carries out initiating to obtain the current request that can switch the access network information that inserts of described user terminal to access network discovery and selection function ANDSF entity before network switches;
Described ANDSF entity is that described user terminal is determined the current access network and the trust information thereof that can switch insert of described user terminal, and notifies described user terminal with access network and trust information thereof that described user terminal can switch access; And
Described user terminal is selected access network and is inserted in switching the access network that inserts.
Preferably, described user terminal can be switched the access network and the trust information thereof that insert notify described user terminal, comprise:
After described ANDSF entity receives the request of described user terminal, with trusted access network and trust information thereof, or/and non-trust access network and trust information thereof are notified described user terminal.
Preferably, described user terminal also carries and obtains the indication information that access network is trusted access network or non-trust access network to some extent to obtaining in the request that can switch the access network information that inserts that described ANDSF entity is initiated.
Preferably, after described ANDSF entity receives the request of described user terminal, trusted access network and trust information thereof that described user terminal requests is inserted, or non-trust access network and trust information thereof are notified described user terminal.
Preferably, store described user terminal home network and the current trusting relationship that can switch between each network that inserts in the described ANDSF entity.
A kind of switching device shifter based on access network selection comprises:
Transmitting element is used for before the user terminal that inserts EPS carries out the network switching, sends the current request that can switch the access network information that inserts of described user terminal of obtaining to the ANDSF entity;
Determining unit is used to described user terminal to determine the current energy of described user terminal and switches access network and the trust information thereof that inserts;
Notification unit is used for that described user terminal can be switched the access network and the trust information thereof that insert and notifies described user terminal; And
Select access unit, be used for to switch the access network that inserts and select access network and access at described user terminal.
Preferably, described notification unit is with trusted access network and trust information thereof, or/and non-trust access network and trust information thereof are notified described user terminal.
Preferably, described user terminal also carries and obtains the indication information that access network is trusted access network or non-trust access network to some extent to obtaining in the request that can switch the access network information that inserts that described ANDSF entity is initiated.
Preferably, trusted access network and trust information thereof that described notification unit inserts described user terminal requests, or non-trust access network and trust information thereof are notified described user terminal.
Preferably, store described user terminal home network and the current trusting relationship that can switch between each network that inserts in the described ANDSF entity.
ANDSF entity of the present invention is receiving the current request that can switch the access network information that inserts of obtaining of UE, according to the residing positional information of UE, determine the Access Network information that UE can insert, and the definite UE Access Network that can insert and the trust information of UE home network, determine that promptly which Access Network is trusty for the Access Network under the UE, and which is fly-by-night, and UE carries out access network selection and switch inserting according to the trust information situation of the Access Network that can insert.Because UE had determined the trust information of the Access Network that can insert before inserting, therefore, after having selected Access Network, can guarantee that UE switches access smoothly efficiently, and guarantee the UE upward real-time and the continuity of business.The present invention program realizes simple and practical.
Description of drawings
Fig. 1 is the composition structural representation of EPS system architecture;
Fig. 2 is the application structure schematic diagram of ANDSF entity;
Fig. 3 obtains the flow chart of Access Network trusting relationship information from the ANDSF entity for UE of the present invention;
Fig. 4 obtains the flow chart of trusted Access Network tabulation from the ANDSF entity for UE;
Fig. 5 obtains the flow chart of trustless Access Network tabulation from the ANDSF entity for UE;
Fig. 6 is for using behind the present invention program UE to the switching flow figure of non-3GPP connecting system;
Fig. 7 is this composition structural representation based on the switching device shifter of access network selection.
Embodiment
ANDSF entity of the present invention is receiving the current request that can switch the access network information that inserts of obtaining of UE, according to the residing positional information of UE, determine the Access Network information that UE can insert, and the definite UE Access Network that can insert and the trust information of UE home network, determine that promptly which Access Network is trusty for the Access Network under the UE, and which is fly-by-night, and UE carries out access network selection and switch inserting according to the trust information situation of the Access Network that can insert.Because UE had determined the trust information of the Access Network that can insert before inserting, therefore, after having selected Access Network, can guarantee that UE switches access smoothly efficiently, and guarantee the UE upward real-time and the continuity of business.The present invention program realizes simple and practical.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Embodiment one
Fig. 3 obtains the flow chart of Access Network trusting relationship information from the ANDSF entity for UE of the present invention, as shown in Figure 3, UE is by S14 interface visit ANDSF entity, and adopts the PULL pattern to carry out the information of the Access Network that initiatively application can insert to the EPS network, triggers the ANDSF entity and sends the network information to UE.Store UE home network and the current trusting relationship that can switch between each access network that inserts in the ANDSF entity.Trusting relationship wherein is whether to have signed the agreement of trusting relationship between the operator of the network that belongs to according to UE and certain the access network operator and definite, if signed the agreement of trusting relationship between the operator of the network that UE belonged to and the operator of certain access network, then the relation between UE home network and this access network is configured to the trusted relation, otherwise is configured to fly-by-night relation.Specifically comprise the steps:
Step 301:UE sends " Access Network message request " signaling to the ANDSF entity, request ANDSF entity return the Access Network that can insert the current UE position ID and with the trusting relationship of UE home network.Also carry the information of UE position in " Access Network message request ".The ANDSF entity is determined the information of all overlay networks in this zone according to the information of the current position of UE, and determine these network of networks signs and and the current Access Network that inserts of UE between trusting relationship.As shown in " can insert Access Network tabulation " among Fig. 3, the information whether network identity (information such as network title or numbering) and this Access Network trust is determined.
Step 302:ANDSF entity returns " Access Network acknowledgement messaging " signaling to UE, carried in this message the Access Network that can insert the UE position ID and with the trusting relationship of UE home network, select the Access Network reference when switching for UE.Be about to " the Access Network tabulation that can insert " the notice UE shown in the figure.
Need to prove that when receiving " Access Network message request " signaling, the ANDSF entity also can only return trusted Access Network ID and trust information thereof to UE, the Access Network of promptly giving tacit consent to UE and being asked is the trusted Access Network.Perhaps, when receiving " Access Network message request " signaling, the ANDSF entity also can only return non-trust Access Network ID and trust information thereof to UE, and the Access Network of promptly giving tacit consent to UE and being asked is non-trust Access Network.
Embodiment two
Fig. 4 obtains the flow chart of trusted Access Network tabulation from the ANDSF entity for UE, as shown in Figure 4, UE is by S14 interface visit ANDSF entity, adopt the PULL pattern to carry out the information of the Access Network that initiatively application can insert to network, and carry the indication information of " trusted Access Network ", trigger the ANDSF entity and send the tabulation of trusted Access Network, after the ANDSF entity is received this signaling, from the current Access Network tabulation that can insert, filter out Access Network tabulation trusty and return to UE to UE.Specifically comprise the steps:
Step 401:UE sends " Access Network message request " signaling to the ANDSF entity, and carries the indication information of " trusted Access Network ", and request ANDSF entity returns the tabulation of the Access Network trusty that can insert the current UE position.Also carry the information of UE position in " Access Network message request ".The ANDSF entity is the information that UE determines the trusted Access Network, as " the Access Network tabulation trusty that can the insert " item among Fig. 4, comprises the identification information (information such as network title or numbering) of Access Network trusty, and " trusty " identification information.
After step 402:ANDSF entity is received indication, from the current Access Network tabulation that can insert, filter out Access Network trusty,, return to UE, select the Access Network reference when switching for UE by " Access Network acknowledgement messaging " signaling.Be about to " the Access Network tabulation trusty that can insert " the notice UE shown in the figure.
Embodiment three
Fig. 5 obtains the flow chart of trustless Access Network tabulation from the ANDSF entity for UE, as shown in Figure 5, UE is by S14 interface visit ANDSF entity, adopt the PULL pattern to carry out the information of the Access Network that initiatively application can insert to network, and carry the indication information of " trustless Access Network ", trigger the ANDSF entity and send trustless Access Network tabulation, after the ANDSF entity is received this signaling, from the current Access Network tabulation that can insert, filter out fly-by-night Access Network tabulation and return to UE to UE.Specifically comprise the steps:
Step 501:UE sends " Access Network message request " signaling to the ANDSF entity, and the indication of carrying " trustless Access Network ", and request ANDSF entity returns the tabulation of the fly-by-night Access Network that can insert the current UE position; Also carry the information of UE position in " Access Network message request ".The ANDSF entity is the information that UE determines trustless Access Network, as " the fly-by-night Access Network tabulation that can the insert " item among Fig. 5, the identification information (information such as network title or numbering) that comprises Access Network trusty, and " fly-by-night " identification information.
After step 502:ANDSF entity is received indication, from the current Access Network tabulation that can insert, filter out fly-by-night Access Network,, return to UE, select the Access Network reference when switching for UE by " Access Network acknowledgement messaging " signaling.Be about to " the fly-by-night Access Network tabulation that can insert " the notice UE shown in the figure.
Embodiment four
Fig. 6 is that UE is to the switching flow figure of non-3GPP connecting system behind application the present invention program, and as shown in Figure 6, the flow process that UE switches may further comprise the steps:
Step 601:UE is linked into EPS by the 3GPP connecting system.Certainly occurrence scene also may be that UE is linked into EPS by non-3GPP connecting system, because subsequent operation is similar, does not do independent description at this.
Step 602:UE is because certain reason need be initiated to switch, and for example the wireless signal strength of current access network can not support reasons such as current business.
Step 603:UE is by S14 interface visit ANDSF entity, obtain the Access Network list (obtain manner is referring to Fig. 4) that can insert, and select an Access Network to initiate to switch and adhere to, but owing to comprise the trusting relationship of Access Network and UE home network in the access network list that the ANDSF entity provides, so which network UE can select to insert.
Generally speaking, in order to guarantee that UE can insert by first-selected 3GPP Access Network trusty for business provides rational QoS to guarantee and accurately reasonably charging; Known this Access Network of UE is that trust or mistrustful.
Step 604: determine that the selected Access Network of UE is Access Network trusty or fly-by-night Access Network, if selected be Access Network trusty, execution in step 605, otherwise execution in step 605a.
Step 605:UE finishes authorizing procedure according to the access way of Access Network trusty.
Step 605a:UE inserts according to the access way of fly-by-night Access Network.At first, UE need seek an ePDG for current access.
Set up the IPsec tunnel between step 605b:UE and the ePDG.
The access authentication of step 605c:UE is finished.
Step 606: the subsequent step of switching flow, such as the switching in PMIP tunnel, the refreshing and rebuild etc. of PCC session.Refreshing with rebuilding etc. of the switching in the PMIP tunnel in the step 606, PCC session is prior art, and emphasis that neither technical solution of the present invention is not given unnecessary details here.
Step 607: switch and finish.UE inserts EPS by non-3GPP connecting system.
Fig. 7 is this composition structural representation based on the switching device shifter of access network selection, as shown in Figure 7, this switching device shifter based on access network selection comprises transmitting element 70, determining unit 71, notification unit 72 and selects access unit 73, wherein, transmitting element 70 is used for before the user terminal that inserts EPS carries out the network switching, sends the current request that can switch the access network information that inserts of described user terminal of obtaining to the ANDSF entity; Determining unit 71 is used to described user terminal to determine access network and trust information thereof that the current energy switching of described user terminal inserts; Notification unit 72 is used for that described user terminal can be switched the access network and the trust information thereof that insert and notifies described user terminal; Select access unit 73 to be used for to switch the access network that inserts and select access network and access at described user terminal.Described user terminal is to obtaining in the request that can switch the access network information that inserts that described ANDSF entity is initiated, also carry and obtain the indication information that access network is trusted access network or non-trust access network to some extent, and the positional information of described user terminal.Described ANDSF entity determines that according to the positional information of described user terminal the current energy of described user terminal switches the access network information that inserts.Store the access network of the current access of described user terminal and the trusting relationship between each access network in the described ANDSF entity.
Those skilled in the art are to be understood that, switching device shifter based on access network selection shown in Figure 7 is for realizing that aforesaid changing method based on access network selection is provided with, and the realization function of the each processing unit among the figure can be understood with reference to the associated description in the previous embodiment one to embodiment four.The function of each unit can realize by the program that runs on the processor in the device shown in Figure 7, also can realize by concrete logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the changing method based on access network selection is characterized in that, comprising:
Having inserted user terminal among the grouping system EPS of evolution carries out initiating to obtain the current request that can switch the access network information that inserts of described user terminal to access network discovery and selection function ANDSF entity before network switches;
Described ANDSF entity is that described user terminal is determined the current access network and the trust information thereof that can switch insert of described user terminal, and notifies described user terminal with access network and trust information thereof that described user terminal can switch access; And
Described user terminal is selected access network and is inserted in switching the access network that inserts.
2. method according to claim 1 is characterized in that, described user terminal can be switched the access network and the trust information thereof that insert notify described user terminal, comprising:
After described ANDSF entity receives the request of described user terminal, with trusted access network and trust information thereof, or/and non-trust access network and trust information thereof are notified described user terminal.
3. method according to claim 1, it is characterized in that, described user terminal also carries and obtains the indication information that access network is trusted access network or non-trust access network to some extent to obtaining in the request that can switch the access network information that inserts that described ANDSF entity is initiated.
4. method according to claim 3, it is characterized in that, after described ANDSF entity receives the request of described user terminal, trusted access network and trust information thereof that described user terminal requests is inserted, or non-trust access network and trust information thereof are notified described user terminal.
5. according to each described method in the claim 1 to 4, it is characterized in that, store described user terminal home network and the current trusting relationship that can switch between each access network that inserts in the described ANDSF entity.
6. the switching device shifter based on access network selection is characterized in that, comprising:
Transmitting element is used for before the user terminal that inserts EPS carries out the network switching, sends the current request that can switch the access network information that inserts of described user terminal of obtaining to the ANDSF entity;
Determining unit is used to described user terminal to determine the current energy of described user terminal and switches access network and the trust information thereof that inserts;
Notification unit is used for that described user terminal can be switched the access network and the trust information thereof that insert and notifies described user terminal; And
Select access unit, be used for to switch the access network that inserts and select access network and access at described user terminal.
7. device according to claim 6 is characterized in that, described notification unit is with trusted access network and trust information thereof, or/and non-trust access network and trust information thereof are notified described user terminal.
8. device according to claim 6, it is characterized in that, described user terminal also carries and obtains the indication information that access network is trusted access network or non-trust access network to some extent to obtaining in the request that can switch the access network information that inserts that described ANDSF entity is initiated.
9. device according to claim 6 is characterized in that, trusted access network and trust information thereof that described notification unit inserts described user terminal requests, or non-trust access network and trust information thereof are notified described user terminal.
10. according to each described device in the claim 6 to 9, it is characterized in that, store described user terminal home network and the current trusting relationship that can switch between each access network that inserts in the described ANDSF entity.
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