WO2014110952A1

WO2014110952A1 - Method and apparatus for selecting v-andsf, and method and apparatus for accessing access network

Info

Publication number: WO2014110952A1
Application number: PCT/CN2013/089212
Authority: WO
Inventors: 陈淑; 朱春晖; 霍玉臻
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-01-17
Filing date: 2013-12-12
Publication date: 2014-07-24
Also published as: CN103945493A; CN103945493B

Abstract

Disclosed are a method and an apparatus for selecting a V-ANDSF, and a method and an apparatus for accessing an access network. The present invention is mainly applied in a scenario where a UE simultaneously accesses a 3GPP access network and a WLAN, the 3GPP access network and the WLAN being separately deployed with different visited-access network discovery and selection functions (V-ANDSFs). The method for selecting the V-ANDSF comprises: a UE sending an ANDSF network element selection request message to an H-ANDSF, the ANDSF network element selection request message comprises a PLMN identification 1 of a 3GPP access network, an access technology parameter 1 of the 3GPP, a PLMN identification 2 of a WLAN, and an access technology parameter 2 of the WLAN; after the H-ANDSF selects the V-ANDSF for the UE, the UE receiving an ANDSF network element selection response message sent by the H-ANDSF, the ANDSF network element selection response message carrying a V-ANDSF parameter of the selected V-ANDSF. By means of the present invention, an effect can be achieved: an operator can provide a policy in which a UE is allocated to a roaming operator of the operator, so that the UE can flexibly select an access network and the access success rate and the use effect are ensured.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and device for selecting a V-ANDSF, and an access network access method and apparatus. BACKGROUND OF THE INVENTION In order to maintain the competitiveness of the third generation mobile communication system in the communication field, users are provided with faster, less delayed, and more personalized mobile communication services, and at the same time, reduce operating costs of operators, the third generation The 3rd Generation Partnership Project (3GPP) Standards Working Group is working on the Evolved Packet System (EPS). The entire EPS system is divided into two parts: the wireless access network and the core network. The radio access network is divided into a 3GPP access network and a non-3GPP access network. The radio access network is composed of an Evolved NodeB (eNB) and a 3G radio network controller (RNC). It is mainly responsible for transmitting and receiving wireless signals, and is connected through the air interface and the terminal. Radio resources, resource scheduling, and access control for the air interface. In the core network, a Home Subscriber Server (HSS), a Mobility Management Entity (MME), a Serving GPRS Support Node (SGSN), and a policy are included. The Policy and Charging Rule Function (PCRF), the Serving Gateway (S-GW), and the PDN Gateway (P-GW). 1 is a schematic structural diagram of an evolved packet core network (EPC) according to a related art 3GPP and a non-3GPP access system. As shown in FIG. 1, the EPS system supports 3GPP access. The HSS is a permanent storage location of the user subscription data, and is located at the home of the user subscription; the MME is responsible for control plane related functions such as mobility management, non-access stratum signaling processing, and user mobility management context management; S-GW It is an access gateway device connected to the 3GPP access network, and forwards data between the 3GPP access and the P-GW, and buffers the data; the P-GW is an EPS and a Packet Data Network (PDN). The border gateway is responsible for the PDN access and its function of forwarding data between the EPS and the PDN. The PCRF is a policy and charging rule function entity. It is connected to the carrier service network through the receiving interface Rx, and is responsible for providing charging control. Online credit control, threshold control, and Quality of Service (QoS); SGSN is a service support node for GEARN and UTRAN users to access the core network. It is functionally similar to the mobility management entity and is responsible for user location updates. Paging management and bearer management functions. As shown in Figure 1, the EPS system also supports non-3GPP access. The interworking with the non-3GPP access is implemented through the S2a/S2b/S2c interface, the P-GW is used as the anchor between the 3GPP and the non-3GPP access, and the non-3GPP access is divided into the trusted non-3GPP access and the non-credit non-3GPP. Access. The non-3GPP access can be directly connected to the P-GW through the S2a interface, and the S2a interface uses the Proxy Mobile IP (PMIP) protocol for information exchange. The untrusted non-3GPP access is connected to the P-GW through an Evolved Packet Data Gateway (ePDG). The interface between the ePDG and the P-GW is S2b. The S2c interface provides user plane control and mobility support between User Equipment (UE) and P-GW. The mobility protocol supported by the S2c interface is Mobile IPv6 support for Dual Stack Hosts. And Routers, referred to as DSMIPv6). The rapid development of smart terminals and mobile Internet applications has made mobile data traffic proliferating at an incalculable rate. In order to effectively alleviate the traffic pressure and continue to promote the development of mobile communication services, more and more operators around the world choose to develop wireless local area network (WLAN), and use low-cost, high-bandwidth WLAN as the cellular network. Diversion. The Access Network Discovery and Selection Function (ANDSF) is used as an access anchor to enable intelligent network selection and effective network offloading through interaction between the network and the terminal. Collaborative operational direction. ANDSF develops strategies to help end users choose the best access network standard and achieve synergy for multiple access methods. In the prior art, ANDSF was proposed in the R8 version. When the UE wants to select a network for registration, if there are both a 3GPP access network and a non-3GPP access network, the EPS may provide available access network discovery information to the UE through the ANDSF according to the current location information of the UE, or inter-system mobility. The Inter-System Mobility Policy (ISMP) is used by the UE to select the appropriate access network for registration using the information provided by the ANDSF. If multiple non-3GPP access networks exist at the same time, the EPS may provide an inter-system routing policy (ISRP) to the UE through the ANDSF according to the current location information of the UE, and the UE uses the information provided by the ANDSF to select an appropriate one. The access network is offloaded. 2 is a schematic diagram of an ANDSF architecture according to the related art. As shown in FIG. 2, a Home Access Network Discovery and Selection Function (H-ANDSF) and a visited access network discovery and The access function (Visited Access Network Discovery and Selection Function, V-ANDSF for short) is connected to the UE through the S14 interface. The interface uses the Open Mobile Alliance Device Management (OMA DM) protocol. In the prior art, the ANDSF can solve the problem of 3GPP handover to non-3GPP access network selection, and can also solve the problem of offload routing of multiple access terminals, for example: UE with IP flow migration capability (IP Flow) Mobility capable UE (abbreviated as IFOM capable UE), UE with Multiple Access PDN Connectivity capable UE (abbreviated as MAPCON capable UE), UE with and activated slotted WLAN offload capability (Non- The seamless WLAN offload capable UE, abbreviated as NS WO capable UE). WLAN technology is also continuing to develop. Hotspot 2.0 (referred to as HS 2.0) is also called Next Generation Hotspot (NGH). It is pushed by the AP to the UE through the advertisement server (Advertisement Server). External network information provides WLAN users with seamless roaming and seamless authentication capabilities, enabling WLAN users to experience and experience close to cellular users.

The ANDSF can statically configure the characteristic information of the hotspot 2.0 access network, and the feature information of the hotspot 2.0 access network is transmitted on the S14 interface shown in FIG. However, the prior art has the following drawbacks:

1. When the UE accesses 3GPP and WLAN at the same time, and the 3GPP and WLAN access to different visited public land mobile networks (VPLMN), each VPLMN operator may deploy a V. -ANDSF, and the policies of different V-ANDSFs may be in conflict. The strategy of the UE's ANDSF of which VPLMN should be selected is not yet clear.

2. During certain time periods and specific areas, such as during peak hours in the city center, operators may wish to offload traffic to their roaming partners. This roaming partner may be the operator of the hotspot 2.0 access network, or may be a non-hotspot 2.0. The operator of the access network. The Validity Area and the Time of Day have been provided in the ANDSF policy, which can solve the problem of traffic to other operators of access technologies during peak hours in the city center, but it is still necessary to consider this case to divert to other Roaming partner issues. For the scenario where the roaming partner is the operator of the hotspot 2.0 access network, it can be solved by the existing organization identifiers (Organization Identifiers, OIs) and domains (Realms). However, there is no solution for the scenario where the roaming partner belongs to the operator of the non-hotspot 2.0 access network.

(1) According to the prior art, after the interworking wireless local area network (Interworking-WLAN, I-WLAN for short) is implemented and the public land mobile network (PLMN) is selected and selected, the PLMN can be performed. The ANDSF procedure, and the policy provided by the ANDSF does not yet contain information related to the PLMN selection priority. In this way, even if the operator includes the service set identifier (Service Set ID, SSID) of the roaming partner operator in the ANDSF policy, the UE cannot reselect another different PLMN and cannot select the SSID belonging to the PLMN. (2) For UEs that do not support Hotspot 2.0 technology, I-WLAN technology is required to implement interworking between 3GPP and WLAN. However, the operator may decide not to provide the I-WLAN Management Object (I-WLAN Management Object, I-WLAN MO for short) to the UE. Or, although the operator provides the I-WLAN MO to the UE, the information is incomplete or does not provide any WLAN-related information at all. Then, the UE cannot reselect another different PLMN to select the SSID belonging to this PLMN.

(3) For a UE that does not support Hotspot 2.0 technology, if the policy provided by the ANDSF to the UE indicates that SSID1 has a high priority in a certain time period and a specific area, and SSID2 is selected in other time periods or other areas. However, according to the I-WLAN process, the PLMN priority list in the UE indicates that the SSID2 has a higher priority than the SSIDl. However, in the case of such a policy conflict, how the UE selects the SSID is not yet clear. It can be seen that the prior art has the above-mentioned various technical defects, which inevitably causes the UE that has not supported the hotspot 2.0 technology to implement the selection of the roaming operator's access network. For the problem that the UE that does not support the Hotspot 2.0 technology in the related art cannot implement the selection of the roaming access network, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for selecting a V-ANDSF, an access method and apparatus for an access network, to at least solve the above problems. According to an aspect of the present invention, a method for selecting a V-ANDSF is provided, which is applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN), wherein the 3GPP access network and the WLAN Different visited access network discovery and selection functions (V-ANDSF) are respectively deployed, including: User equipment (UE) sends access network discovery and selection function to the home access network discovery and selection function (H-ANDSF) (ANDSF) a network element selection request message, where the ANDSF network element selection request message includes: a public land mobile network (PLMN) identity of the 3GPP access network, an access technology parameter of the 3GPP, a PLMN identity 2 of the WLAN, and a WLAN Accessing the technical parameter 2; after the H-ANDSF selects the V-ANDSF for the UE according to the ANDSF network element selection request message, the UE receives the ANDSF network element selection response message sent by the H-ANDSF, where the ANDSF network element selection response message is carried There is a V-ANDSF parameter for the selected V-ANDSF. Preferably, in the process of selecting the V-ANDSF for the UE by the H-ANDSF, the H-ANDSF sequentially selects the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain in sequence, and the user equipment (UE) belongs to the home device. Before the access network discovery and selection function (H-ANDSF) sends an access network discovery and selection function (ANDSF) network element selection request message, the method further includes: the UE determines that the 3GPP access network and the WLAN are respectively accessed to different PLMN. Preferably, the V-ANDSF parameter includes one of the following: the visited access network discovery and selection function of the V-ANDSF is referred to as V-ANDSF-SN, and the IP address of the V-ANDSF. Preferably, after the UE receives the ANDSF network element selection response message sent by the H-ANDSF, the method further includes: the UE sending an access network information request message (Access Network Information Request) to the selected V-ANDSF according to the V-ANDSF parameter, The method includes: when the V-ANDSF parameter is a V-ANDSF-SN, the UE uses a V-ANDSF-SN to perform a Dynamic Host Configuration Protocol (DHCP) query or a Domain Name System (DNS). The query obtains the address of the V-ANDSF; the UE sends an access network information request message to the V-ANDSF according to the address of the V-ANDSF. According to another aspect of the present invention, a device for selecting a V-ANDSF is provided, located at a user equipment

(UE), is applied to a scenario where the UE accesses the 3GPP access network and the wireless local area network (WLAN) at the same time, where the 3GPP access network and the WLAN respectively deploy different visited access network discovery and selection functions (V-ANDSF) And comprising: a first sending module, configured to send an access network discovery and selection function (ANDSF) network element selection request message to the home access network discovery and selection function (H-ANDSF), wherein the ANDSF network element selection request The message includes: a public land mobile network (PLMN) identity of the 3GPP access network, an access technology parameter of the 3GPP, a PLMN identity 2 of the WLAN, and an access technology parameter 2 of the WLAN; the receiving module is set to be based on the H-ANDSF The ANDSF network element selection request message receives the ANDSF network element selection response message sent by the H-ANDSF after the UE selects the V-ANDSF, and the ANDSF network element selection response message carries the V-ANDSF parameter of the selected V-ANDSF. Preferably, the apparatus further comprises: a determining module, configured to send to the H-ANDSF at the first sending module

Before the ANDSF network element selects the request message, it is determined that the 3GPP access network and the WLAN respectively access different PLMNos, and the V-ANDSF parameters include one of the following: V-ANDSF visited access network discovery and selection function server name V -ANDSF-SN, V-ANDSF IP address. Preferably, the apparatus further includes: a second sending module, configured to send an access network information request message to the selected V-ANDSF according to the V-ANDSF parameter after the receiving module receives the ANDSF network element selection response message. Preferably, the second sending module comprises: a query unit, configured to perform dynamic host setup protocol (DHCP) query or domain name system (DNS) query using the V-ANDSF-SN when the V-ANDSF parameter is V-ANDSF-SN The address of the V-ANDSF; the transmitting unit, configured to send an access network information request message to the V-ANDSF according to the address of the V-ANDSF. According to still another aspect of the present invention, there is provided a device for selecting a V-ANDSF, located in a Home Access Network Discovery and Selection Function (H-ANDSF), applied to a User Equipment (UE) and simultaneously accessing a 3GPP Access Network And a wireless local area network (WLAN) scenario, wherein the 3GPP access network and the WLAN respectively deploy different visited access network discovery and selection functions (V-ANDSF), including: a selection module, configured as a user equipment (UE) Selecting a V-ANDSF from the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain; the sending module is configured to send an ANDSF network element selection response message to the UE, where the ANDSF network element selection response message carries The V-ANDSF parameter of the selected V-ANDSF. Preferably, the apparatus further includes: a receiving module, configured to receive an ANDSF network element selection request message from the UE, where the ANDSF network element selection request message includes: a public land mobile network (PLMN) identity of the 3GPP access network, and 3GPP Access technology parameters 1, PLMN identity 2 of the WLAN, and access technology parameter 2 of the WLAN. Preferably, the V-ANDSF parameter includes one of the following: the visited address of the V-ANDSF access network discovery and selection function server name V-ANDSF-SN, V-ANDSF IP address. Preferably, the selecting module sequentially selects the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain in the sequence of selecting the V-ANDSF for the UE. According to still another aspect of the present invention, an access method of an access network is provided, which is applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN), wherein the 3GPP access network And the WLAN separately deploys different visited access network discovery and selection functions (V-ANDSF), including: the UE performs target access network selection and handover decisions according to the inter-system mobility policy and/or the access network discovery information; The inter-system mobility policy includes one of the following: an interworking wireless local area network (I-WLAN) preferred access node, a public land mobile network (PLMN) domain leaf; the access network discovery information includes: a PLMN domain leaf. Preferably, the I-WLAN selective access node further includes at least one of the following: an I-WLAN Home Public Land Mobile Network (HPLMN) preferred level indicator leaf, HPLMN direct access leaf, I- The WLAN peer-to-peer public land mobile network (Equivalent Home Public Land Mobile Network, EHPLMN for short) displays the indication leaf, the preferred roaming list node, wherein the preferred roaming list node includes: a PLMN domain leaf, a PLMN priority leaf, a service set identifier Service Set Identifier (SSID) leaves and SSID priority leaves. Preferably, the PLMN in the PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with the home carrier. According to still another aspect of the present invention, an access device of an access network is provided, which is located in a user equipment (UE), and is applied to a scenario in which a UE simultaneously accesses a 3GPP access network and a wireless local area network (WLAN), wherein 3GPP The access network and the WLAN respectively deploy different visited access network discovery and selection functions (V-ANDSF), including: a processing module, configured to perform target access according to an inter-system mobility policy and/or access network discovery information. The network selection and handover decision; wherein, the inter-system mobility policy includes one of the following: an interworking wireless local area network (I-WLAN) preferred access node, a public land mobile network (PLMN) domain leaf; the access network discovery information includes: PLMN Domain leaves. Preferably, the I-WLAN selective access node further comprises at least one of the following: an I-WLAN attribution public land mobile network (HPLMN) preference level indication leaf, an HPLMN direct access leaf, an I-WLAN EHPLMN display indication leaf, a preferred roaming The list node, wherein the preferred roaming list node comprises: a PLMN domain leaf, a PLMN priority leaf, a service set identifier (SSID) leaf, and an SSID priority leaf. Preferably, the PLMN in the PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with the home carrier. According to still another aspect of the present invention, an access device for an access network is provided, which is located in an Access Network Discovery and Selection Function (ANDSF), and is applied to a User Equipment (UE) to simultaneously access a 3GPP access network and a wireless local area network. (WLAN) scenario, wherein the 3GPP access network and the WLAN respectively deploy different visited access network discovery and selection functions (V-ANDSF), including: an indication module, configured to instruct the UE according to the inter-system mobility policy and / or access network discovery information for target access network selection and handover decisions; wherein, the inter-system mobility policy includes one of the following: Interworking wireless local area network (I-WLAN) preferred access node, public land mobile network (PLMN) Domain leaf; access network discovery information includes: PLMN domain leaf. Preferably, the I-WLAN selective access node further comprises at least one of the following: I-WLAN home public land mobile network HPLMN priority level indication leaf, HPLMN direct access leaf, I-WLAN EHPLMN display indication leaf, preferred roaming list node The preferred roaming list node includes: a PLMN domain leaf, a PLMN priority leaf, a service set identifier (SSID) leaf, and an SSID priority leaf. Through the present invention, the H-ANDSF is used to send the address of the V-ANDSF selected by the UE to the UE, so that the UE can initiate the access to the network information request message according to the addresses, or the existing inter-system mobility by the ANDSF. The policy and/or the access network discovery information is extended, and after receiving the access network information request message of the UE, the access network information response message is returned to the UE, so that the UE successfully selects the access network, and the hotspot 2.0 technology is not supported. The UE cannot implement the problem of the selection of the access network of the roaming operator, so that the operator can provide the policy of offloading to the roaming operator to the UE, so that the UE can flexibly select the access network, and ensure the success rate of the access. Use the effect of the effect. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic structural diagram of an evolved packet core network (EPC) according to a related art 3GPP and a non-3GPP access system; FIG. 2 is a schematic diagram of an ANDSF architecture according to the related art; FIG. 4 is a flowchart of selecting a V-ANDSF for a UE according to a preferred embodiment 1 of the present invention; FIG. 5 is a UE located in a UE according to Embodiment 1 of the present invention; FIG. 6 is a structural block diagram of an apparatus for selectively selecting a V-ANDSF of a UE according to a first embodiment of the present invention; FIG. 7 is a block diagram of the H-ANDSF according to the first embodiment of the present invention. FIG. 8 is a structural block diagram of an apparatus for selecting a V-ANDSF preferably located in an H-ANDSF according to Embodiment 1 of the present invention; FIG. 9 is an access network according to Embodiment 2 of the present invention; FIG. 10 is a flowchart of indicating a PLMN selection priority when an ANDSF provides a policy and/or access network information for a UE according to a preferred embodiment 2 of the present invention; FIG. 11 is a flowchart of a preferred embodiment 2 according to the present invention. ANDSF manages object-to-system mobility FIG. 12 is a schematic diagram of an ANDSF management object access network discovery information adding a PLMN according to a preferred embodiment 2 of the present invention; FIG. 13 is an ANDSF according to a preferred embodiment 3 of the present invention. A flow chart instructing the PLMN to select a priority when providing policy and/or access network information; 14 is a schematic diagram of a new PLMN domain in an ANDSF management object inter-system mobility policy according to a preferred embodiment of the present invention; FIG. 15 is a structural block diagram of an access device of an access network of a UE according to Embodiment 2 of the present invention; And FIG. 16 is a structural block diagram of an access device of an access network located in an ANDSF according to Embodiment 2 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 3 is a flowchart of a method for selecting an access network according to a first embodiment of the present invention, where the method is applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN) (wherein 3GPP access) The network and the WLAN respectively deploy different V-ANDSFs. As shown in FIG. 3, the method mainly includes the following steps (step S302-step S304): Step S302, the user equipment (UE) discovers and selects the home access network. Function (H-ANDSF) sends an Access Network Discovery and Selection Function (ANDSF) network element selection request message, where the ANDSF network element selection request message includes: a Public Land Mobile Network (PLMN) identity of the 3GPP access network, 3GPP Accessing the technical parameter 1, the PLMN identity 2 of the WLAN, and the access technology parameter 2 of the WLAN; Step S304, after the H-ANDSF selects the V-ANDSF for the UE according to the ANDSF network element selection request message, the UE receives the H-ANDSF transmission The ANDSF network element selects a response message, where the ANDSF network element selection response message carries the V-ANDSF parameter of the selected V-ANDSF. In the first embodiment, in the process of selecting the V-ANDSF for the UE by the H-ANDSF, the H-ANDSF may sequentially select the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain in sequence, in step S302. The method further includes: the UE determines that the 3GPP access network and the WLAN are respectively connected to different PLMNos. In the first embodiment, the V-ANDSF parameter may include one of the following: The network discovers and selects the IP addresses of the function server names V-ANDSF-SN and V-ANDSF. In the first embodiment, after step S304, the UE may further select according to the V-ANDSF parameter.

The V-ANDSF sends an access network information request message, including: when the V-ANDSF parameter is a V-ANDSF-SN, the UE performs a Dynamic Host Setup Protocol (DHCP) query or a Domain Name System (DNS) check using the V-ANDSF-SN. The address of the V-ANDSF is obtained; the UE sends an access network information request message to the V-ANDSF according to the address of the V-ANDSF. The method for selecting an access network provided in Embodiment 1 will be further described below with reference to FIG. 4 and the preferred embodiment 1. Preferred Embodiment 1 FIG. 4 is a flowchart of selecting an ANDSF for a UE by an H-ANDSF according to a preferred embodiment 1 of the present invention. As shown in FIG. 4, the method mainly includes the following steps (step S402-step S414): Step S402, UE Simultaneous access to 3GPP and WLAN, and the UE judges that 3GPP access and WLAN access to different PLMNs. In step S404, the UE discovers the H-ANDSF. Step S406, the UE obtains an H-ANDSF address by using a DHCP query or a DNS query process. In the present invention, the UE sends a new ANDSF network element selection request message to the H-ANDSF, where the message includes the PLMN identity KPLMN ID1 where the 3GPP access is located. 3GPP accesses the access technology, and the PLMN ID2 where the WLAN access is located. WLAN access to the access technology and other message parameters. Step S408, in the preferred embodiment, the H-ANDSF tries to select the location where the 3GPP access is located for the UE.

V-ANDSF 1 deployed by VPLMN1. Alternatively, the H-ANDSF may also prohibit the UE from selecting the V-ANDSF, and only use the H-ANDSF. This is a prior art and will not be described again. Step S410, in the preferred embodiment, the H-ANDSF sends a new ANDSF network element selection response message to the UE, where the message includes the visited access network discovery and selection function server name selected by the H-ANDSF for the UE (Visited Access). Network Discovery and Selection Function Server Name (V-ANDSF-SN) and other message parameters. Optionally, the H-ANDSF sends an ANDSF network element selection response message to the UE, where the message may directly include an IP address of the V-ANDSF selected by the H-ANDSF for the UE. Optionally, if the H-ANDSF prohibits the UE from selecting the V-ANDSF, the message includes a Home Access Network Discovery and Selection Function Server Name (H-ANDSF-SN). Or the IP address of the H-ANDSF, which is a prior art and will not be described again. Step S412, if the V-ANDSF-SN is returned in step S410, the UE obtains the V-ANDSF address by using a DHCP query or a DNS query procedure, and sends an access network information request message to the V-ANDSF. Optionally, if the IP address of the V-ANDSF is returned in step S410, the UE directly sends an access network information request message to the V-ANDSF. Optionally, if the IP address of the H-ANDSF-SN or the H-ANDSF is returned in step S410,

The UE sends an access network information request message to the H-ANDSF. In step S414, the V-ANDSF sends an access network information response message to the UE (this is a prior art and will not be described again). Optionally, if the IP address of the H-ANDSF-SN or the H-ANDSF is returned in step S410, the H-ANDSF sends an access network information response message to the UE. FIG. 5 is a structural block diagram of an apparatus for selecting a V-ANDSF of a UE, where the apparatus is applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN) according to the first embodiment of the present invention. The method for selecting the V-ANDSF provided by the foregoing embodiment 1 is implemented in the 3GPP access network and the WLAN. As shown in FIG. 5, the device mainly includes: a first sending module 10 and Receive module 20. The first sending module 10 is configured to send an access network discovery and selection function (ANDSF) network element selection request message to the home access network discovery and selection function (H-ANDSF), where the ANDSF network element selection request message The method includes: a public land mobile network (PLMN) identifier of the 3GPP access network, an access technology parameter of the 3GPP, a PLMN identity 2 of the WLAN, and an access technical parameter 2 of the WLAN. The receiving module 20 is connected to the first sending module 10 And, after the H-ANDSF selects the V-ANDSF for the UE according to the ANDSF network element selection request message, and receives an ANDSF network element selection response message sent by the H-ANDSF, where the ANDSF network element selection response message carries the selected V -ANDSF's V-ANDSF parameter. FIG. 6 is a structural block diagram of an apparatus for selectively selecting a V-ANDSF of a UE according to a first embodiment of the present invention. As shown in FIG. 6, the preferred apparatus further includes: a determining module 30, connected to the first sending module 10, configured to Before the first sending module sends the ANDSF network element selection request message to the H-ANDSF, it is determined that the 3GPP access network and the WLAN are respectively connected to different PLMNs. Preferably, the V-ANDSF parameter includes one of the following: a visited access network discovery and selection function server name (V-ANDSF-SN) of the V-ANDSF, and an IP address of the V-ANDSF. Preferably, the preferred device further includes: a second sending module 40, connected to the receiving module 20, configured to send the interface to the selected V-ANDSF according to the V-ANDSF parameter after the receiving module 20 receives the ANDSF network element selection response message. Enter the network information request message. The second sending module 40 includes: a query unit 42 configured to perform a dynamic host setup protocol (DHCP) query or a domain name system using a V-ANDSF-SN when the V-ANDSF parameter is V-ANDSF-SN (DNS query is obtained) The address of the V-ANDSF; the transmitting unit 44, connected to the query unit 42, is arranged to send an access network information request message to the V-ANDSF according to the address of the V-ANDSF. Fig. 7 is a H-ANDSF according to the first embodiment of the present invention. A structural block diagram of a device for selecting a V-ANDSF, the device being applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN) (wherein the 3GPP access network and the WLAN are respectively deployed differently) V-ANDSF), the method for selecting the V-ANDSF provided in the first embodiment, as shown in FIG. 7, the device mainly includes: a selecting module 10 and a sending module 20. wherein the selecting module 10 is set as a user The device (UE) selects a V-ANDSF from the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain; the sending module 20 is connected to the selecting module 10, and is configured to send an ANDSF network element selection response message to the UE. Of which, ANDS The F-element selection response message carries the V-ANDSF parameter of the selected V-ANDSF. FIG. 8 is a structural block diagram of an apparatus for selecting a V-ANDSF preferably located in the H-ANDSF according to the first embodiment of the present invention, as shown in FIG. The preferred device may further include: a receiving module 30, connected to the selecting module 10, configured to receive an ANDSF network element selection request message from the UE, where the ANDSF network element selection request message includes: a public land mobile of the 3GPP access network Network PLMN identity 1, access technology parameter of 3GPP, PLMN identity 2 of WLAN, and access technology parameter 2 of WLAN. Preferably, the V-ANDSF parameter includes one of the following: V-ANDSF visited access network discovery and The IP address of the function server name V-ANDSF-SN and V-ANDSF is selected. Preferably, the selection module 10 sequentially selects the V-ANDSF and the WLAN in the 3GPP access domain in the sequence of selecting the V-ANDSF for the UE. V-ANDSF in a domain. FIG. 9 is a flowchart of an access method of an access network according to Embodiment 2 of the present invention, which is applied to a user equipment.

(UE) A scenario in which the 3GPP access network and the wireless local area network WLAN are simultaneously accessed (where the 3GPP access network and the WLAN respectively deploy different V-ANDSFs). As shown in FIG. 9, the method mainly includes the following steps: S902: The UE performs a target access network selection and a handover decision according to an inter-system mobility policy and/or an access network discovery information. The inter-system mobility policy includes one of the following: an interworking wireless local area network (I-WLAN) Preferably, the access node, the public land mobile network (PLMN) domain leaf; the access network discovery information includes: a PLMN domain leaf. In this embodiment, the I-WLAN selective access node further includes at least one of the following: The I-WLAN selective access node further includes at least one of the following: an I-WLAN attribution public land mobile network (HPLMN) preferred level indicator leaf , the HPLMN direct access leaf, the I-WLAN EHPLMN display indication leaf, the preferred roaming list node, wherein the preferred roaming list node comprises: a PLMN domain leaf, a PLMN priority leaf, a service set identifier (SSID) leaf, and an SSID priority leaf . In this embodiment, the PLMN in the PLMN domain is the PLMN of the roaming partner operator that has signed the roaming agreement with the home carrier. The access method of the access network provided in the foregoing embodiment 2 is further described in the following with reference to FIG. 10 to FIG. 14 and the preferred embodiment 2 and the preferred embodiment 3. Preferred Embodiment 2 First, it should be noted that, in practical applications, the preferred embodiment may be applicable to a case where the UE fails to obtain the I-WLAN management information. 10 is a flowchart of instructing a PLMN to select a priority when an ANDSF provides a policy and/or access network information for a UE according to a preferred embodiment 2 of the present invention. As shown in FIG. 10, the method mainly includes the following steps (step S1002-step) S1016): Step S1002, the ANDSF extends the management object of the inter-system mobility policy. For the extension of the management object, reference is made to FIG. 11 (FIG. 11 is a schematic diagram of adding an I-WLAN management policy by the ANDSF management object inter-system mobility policy according to the preferred embodiment 2 of the present invention), as shown in FIG. Under the node of the inter-system mobility policy, an inter-connected I-WLAN Prioritized Access node is added, and the location is juxtaposed with the prior art preferred access (Prioritized Access) node. Under the newly added interworking WLAN preferred access node, add I-WLAN HPLMN Priority Indication indicator leaf, HPLMN Direct Access leaf, I-WLAN EHPLMN I-WLAN Equivalent HPLMN Presentation Indication leaf; under this new interworking WLAN preferred access node, a new preferred roaming partner list (Prioritized Roaming Partner List) node is added, in this new preferred roaming Under the partner list node, the new PLMN domain (PLMN Realms) leaf, PLMN Priority leaf, SSID leaf, SSID Priority leaf. The new I-WLAN HPLMN priority in the management object is an optional parameter. The value is 0, indicating that the UE should first try to register with the last registered PLMN (Last Registered PLMN, referred to as Last RPLMN). The value is 1, indicating that the UE should first attempt to register with the HPLMN. Among them, the newly added HPLMN directly connected to the management object is an optional parameter. The value is 0, indicating that the HPLMN is directly accessed, which is suitable for the case where the WLAN supports the IEEE 802.1x authentication mechanism. The value is 1, indicating that the HPLMN direct access is activated, which is applicable to the case where the WLAN does not support the IEEE 802.1x authentication mechanism. Among them, the newly added I-WLAN EHPLMN display indication in the management object is an optional parameter. This value is 0, indicating that no EHPLMN is displayed for the UE. The value of 1 indicates that only the EHPLMN with the highest priority is displayed for the UE. A value of 2 indicates that all EHPLMNs are displayed to the UE and are sorted from highest to lowest according to priority. The PLMN included in the newly added PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with the home operator. In step S1004, the ANDSF expands the management object of the access network discovery information. For the extension of the management object, reference is made to FIG. 12 ( FIG. 12 is a schematic diagram of the ANDSF management object access network discovery information adding a PLMN according to the preferred embodiment 2 of the present invention), as shown in FIG. 12, found on the access network. Under the node of the information, under the WLAN Location sub-node of the Access Network Area node, the PLMN domain leaf is added, and the location and SSID are juxtaposed. The PLMN information included in the PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with the home operator. In step S1006, the UE determines that the handover to the WLAN is initiated, and the ANDSF is found. Step S1008: The UE sends an access network information request message to the ANDSF. Step S1010: The ANDSF sends an access network information response message to the UE. The access network information response message includes an inter-system mobility policy and/or an access network discovery information. The inter-system mobility policy optionally carries I-WLAN preferred access information. The I-WLAN preferred access information includes an I-WLAN HPLMN priority indication, an optional HPLMN direct access, an optional I-WLAN EHPLMN display indication, an optional preferred roaming buddy list (PLMN domain, PLMN priority, SSID) , SSID priority); access network discovery information, optionally carrying a PLMN domain. Step S1012: The UE stores an inter-system mobility policy and/or access network discovery information in the access network information response message. If the access network information response message includes an inter-system mobility policy, and the inter-system mobility policy includes an I-WLAN HPLMN priority indication of the I-WLAN preferred access information, the UE stores the parameter, and the parameter may be used for automatic UE Choose the network. If the access network information response message includes an inter-system mobility policy, and the inter-system mobility policy includes direct access by the HPLMN of the I-WLAN preferred access information, the UE stores the parameter, and the parameter may be used for manually selecting the network and the UE. Automatic network selection. When this parameter is set, the WLAN does not support IEEE 802.1x authentication, and when the UE wishes to directly access through the HPLMN, the UE can establish a direct connection with the WLAN of the HPLMN and establish a tunnel. If the access network information response message includes an inter-system mobility policy, and the inter-system mobility policy includes an I-WLAN EHPLMN display indication of the I-WLAN preferred access information, the UE stores the parameter, and the parameter may be used for manual selection by the UE. network. When the parameter value is not 0, or only the EHPLMN with the highest priority is displayed for the UE, or all EHPLMNs are displayed for the UE and sorted from high to low according to the priority. If the access network information response message includes an inter-system mobility policy, and the inter-system mobility policy includes a preferred roaming partner list of I-WLAN preferred access information, the UE stores the list to its operator-controlled I-WLAN access. In the Instrument Controlled PLMN Selector for I-WLAN access file. The UE needs to prioritize the access network and increase the priority of the PLMN: First, traverse the SSID in the preferred roaming partner list of the I-WLAN preferred access, and sort the SSID according to the priority from high to low; secondly, Within the SSID, the PLMN domain in the preferred roaming partner list of the I-WLAN preferred access is traversed, and the PLMNs are sorted according to the priority from high to low. The SSID of the UE selects the SSID with the highest priority of the SSID, and the PLMN selects the PLMN domain with the highest priority of the PLMN. For example, the inter-system mobility policy rule 1: the PLMN domain 1, the PLMN priority 1, the SSID1, and the SSID priority of the preferred roaming partner list of the I-WLAN preferred access. Inter-system mobility policy rule 2: PLMN domain 2 of the preferred roaming partner list for I-WLAN preference access, PLMN priority 2, SSID1, SSID priority 1. Inter-system mobility policy rule 3: PLMN domain 1 of the preferred roaming partner list for I-WLAN preference access, PLMN priority 1, SSID2, SSID priority 2. Inter-system mobility policy rule 4: PLMN domain 2, PLMN priority 2, SSID2, SSID priority 2 of the preferred roaming partner list for I-WLAN preference access. Then, the order of the rule priorities of the four policies is from high to low: Rule 1 > Rule 2 > Rule 3 > Rule 4. According to the rules in the above example, the priority of the access network is ranked from (highest to lowest) (PLMN domain 1, SSIDI) > (PLMN domain 2, SSIDI) > (PLMN domain 1, SSID2) > (PLMN domain 2, SSID2). If the access network discovery message is included in the access network information response message, and the access network discovery information includes the PLMN domain, the PLMN selection process of the I-WLAN must be performed to select the PLMN included in the PLMN domain. Step S1014: The UE performs a target access network selection and handover decision. Step S1016, the UE starts the process of switching to the WLAN. Preferred Embodiment 3 First, it should be noted that, in practical applications, the preferred embodiment may be applicable to a case where a UE obtains partial I-WLAN management information (in this case, the I-WLAN management information may only provide information related to PLMN selection, and The SSID and its priority are not provided. It can also be applied to the case where the UE can obtain all the I-WLAN management information, but there is a conflict between the ANDSF and the SSID priority provided by the I-WLAN policy. 13 is a flowchart of instructing a PLMN to select a priority when an ANDSF provides a policy and/or access network information for a UE according to a preferred embodiment 3 of the present invention. As shown in FIG. 13, the method mainly includes the following steps (step S1302-step) S1316): Step S1302, the ANDSF extends the management object of the inter-system mobility policy. For the extension of the management object, reference is made to FIG. 14 (FIG. 14 is a schematic diagram of the addition of a PLMN domain by the ANDSF management object inter-system mobility policy according to the preferred embodiment 3 of the present invention), as shown in FIG. Under the preferred access sub-node of the node of the sexual policy, a new PLMN domain (PLMN_Realms) leaf is added. The PLMN included in the newly added PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with the home operator, and is a PLMN corresponding to the access identifier of the preferred access. Step S1304, the ANDSF expands the management object of the access network discovery information, as shown in FIG. 6 in the second embodiment. Step S1306, the UE determines that the handover to the WLAN is initiated, and the ANDSF is found. Step S1308: The UE sends an access network information request message to the ANDSF. Step S1310: The ANDSF sends an access network information response message to the UE. The access network information response message includes an inter-system mobility policy and/or an access network discovery information. The inter-system mobility policy may optionally carry a PLMN domain; the access network discovery information may optionally carry a PLMN domain. Step S1312: The UE stores an inter-system mobility policy and/or an access network discovery information in the access network information response message. If the access network information response message includes an inter-system mobility policy, and the inter-system mobility policy includes

In the PLMN domain, the UE accesses the SSID with the highest priority of the access network provided by the ANDSF, and correspondingly selects the PLMN included in the PLMN domain corresponding to the SSID. If the access network priority according to the SSID provided by the ANDSF management object conflicts with the SSID priority provided by the I-WLAN management information, the priority of the access network according to the SSID provided by the ANDSF management object shall prevail. If the access network discovery message is included in the access network information response message, and the access network discovery information includes the PLMN domain, the PLMN selection process of the I-WLAN must be performed to select the PLMN included in the PLMN domain. Step S1314, the UE performs target access network selection and handover decision. Step S1316, the UE starts the process of switching to the WLAN. 15 is a structural block diagram of an access device of an access network of a UE according to a second embodiment of the present invention, where the device is applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN) ( The access method of the access network provided by the foregoing embodiment 2 is implemented in the 3GPP access network and the WLAN, and the device mainly includes: the processing module 10, as shown in FIG. The method is configured to perform target access network selection and handover decisions according to an inter-system mobility policy and/or access network discovery information. The inter-system mobility policy includes one of the following: Interworking wireless local area network (I-WLAN) preferred access Node, Public Land Mobile Network (PLMN) domain leaf; Access network discovery information includes: PLMN domain leaf. Preferably, the I-WLAN selective access node further comprises at least one of the following: an I-WLAN attribution public land mobile network (HPLMN) preference level indication leaf, an HPLMN direct access leaf, an I-WLAN EHPLMN display indication leaf, a preferred roaming The list node, wherein the preferred roaming list node comprises: a PLMN domain leaf, a PLMN priority leaf, a service set identifier (SSID) leaf, and an SSID priority leaf. Preferably, the PLMN in the PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with the home carrier. 16 is a structural block diagram of an access device of an access network located in an ANDSF according to a second embodiment of the present invention, where the device is applied to a scenario where a user equipment (UE) simultaneously accesses a 3GPP access network and a wireless local area network (WLAN) ( The access method of the access network provided by the foregoing embodiment 2 is implemented in the 3GPP access network and the WLAN, and the device mainly includes: an indication module 10, as shown in FIG. The method is configured to instruct the UE to perform target access network selection and handover decisions according to an inter-system mobility policy and/or access network discovery information. The inter-system mobility policy includes one of the following: Interworking wireless local area network (I-WLAN) optimization Access node, Public Land Mobile Network (PLMN) domain leaf; Access network discovery information includes: PLMN domain leaf. Preferably, the I-WLAN selective access node further comprises at least one of the following: I-WLAN home public land mobile network HPLMN priority level indication leaf, HPLMN direct access leaf, I-WLAN EHPLMN display indication leaf, preferred roaming list node The preferred roaming list node includes: a PLMN domain leaf, a PLMN priority leaf, a service set identifier (SSID) leaf, and an SSID priority leaf. The method for selecting an access network and the device for selecting an access network provided by the foregoing embodiments use an H-ANDSF to send a self address or an address of a V-ANDSF selected by the UE to the UE, so that the UE can initiate the connection according to the address. The manner of entering the network information request message, or first extending the existing inter-system mobility policy and/or the access network discovery information by the ANDSF, and then returning the access to the UE after receiving the access network information request message of the UE. The network information response message enables the UE to successfully select the access network, enabling the UE to implement the selection of the best access network, so that the UE can select a suitable access network selection policy. From the above description, it can be seen that the present invention achieves the following technical effects: The H-ANDSF is used to send the UE's own address or the address of the V-ANDSF selected for the UE, so that the UE can initiate the access network according to these addresses. Information request message manner, or the existing inter-system mobility policy and/or access network discovery information is first extended by the ANDSF, and then the access network information is returned to the UE after receiving the access network information request message of the UE. The response message is used to enable the UE to successfully select the access network, which solves the problem that the UE that does not support the hotspot 2.0 technology cannot implement the selection of the access network of the roaming operator, thereby achieving the policy that the operator can provide the traffic to the roaming operator. The UE enables the UE to flexibly select the access network to ensure the success rate of access and the effect of using the effect. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. Industrial Applicability Through the technical solution of the present invention, an operator can provide a policy of offloading to its roaming operator to the UE, so that the UE can flexibly select the access network, and ensure the success rate of the access and the effect of using the effect. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for selecting a V-ANDSF, which is applied to a scenario in which a user equipment UE simultaneously accesses a 3GPP access network and a wireless local area network WLAN, where the 3GPP access network and the WLAN respectively deploy different visited places. Access network discovery and selection function V-ANDSF, including:

The user equipment UE sends an access network discovery and selection function ANDSF network element selection request message to the home access network discovery and selection function H-ANDSF, where the ANDSF network element selection request message includes: the 3GPP access network a public land mobile network PLMN identity 1, an access technology parameter of the 3GPP, a PLMN identity 2 of the WLAN, and an access technology parameter 2 of the WLAN;

After the H-ANDSF selects a V-ANDSF for the UE according to the ANDSF network element selection request message, the UE receives an ANDSF network element selection response message sent by the H-ANDSF, where the ANDSF network The V-ANDSF parameter of the selected V-ANDSF is carried in the metaselect response message.

2. The method according to claim 1, wherein

In the process of the V-ANDSF being selected by the H-ANDSF for the UE, the H-ANDSF sequentially selects the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain in sequence;

Before the user equipment UE sends the access network discovery and selection function ANDSF network element selection request message to the home access network discovery and selection function H-ANDSF, the method further includes: the UE determining the 3GPP access network and The WLANs are respectively connected to different PLMNs.

The method according to claim 1 or 2, wherein the V-ANDSF parameter comprises one of: the V-ANDSF visited access network discovery and selection function server name V-ANDSF-SN, The IP address of the V-ANDSF.

The method according to claim 3, wherein, after the UE receives the ANDSF network element selection response message sent by the H-ANDSF, the method further includes:

And the sending, by the UE, the access network information request message to the selected V-ANDSF according to the V-ANDSF parameter, including: When the V-ANDSF-SN is the V-ANDSF-SN, the UE uses the V-ANDSF-SN to perform a dynamic host setup protocol DHCP query or a domain name system DNS query to obtain an address of the V-ANDSF;

The UE sends the access network information request message to the V-ANDSF according to the address of the V-ANDSF.

5. A device for selecting a V-ANDSF, which is located in a user equipment UE, and is applied to a scenario in which a UE accesses a 3GPP access network and a wireless local area network WLAN, wherein the 3GPP access network and the WLAN are respectively deployed differently. Visiting access network discovery and selection function V-ANDSF, including:

The first sending module is configured to send an access network discovery and selection function ANDSF network element selection request message to the home access network discovery and selection function H-ANDSF, where the ANDSF network element selection request message includes: the 3GPP a public land mobile network PLMN identity of the access network, an access technology parameter of the 3GPP, a PLMN identity 2 of the WLAN, and an access technology parameter 2 of the WLAN;

a receiving module, configured to: after the H-ANDSF selects a V-ANDSF for the UE according to the ANDSF network element selection request message, receive an ANDSF network element selection response message sent by the H-ANDSF, where The ANDSF network element selection response message carries the V-ANDSF parameter of the selected V-ANDSF.

6. The device according to claim 5, wherein the device further comprises:

And a determining module, configured to determine that the 3GPP access network and the WLAN are respectively connected to different PLs before the first sending module sends the ANDSF network element selection request message to the H-ANDSF.

The device according to claim 5 or 6, wherein the V-ANDSF parameter comprises one of: the V-ANDSF visited access network discovery and selection function server name V-ANDSF-SN, The IP address of the V-ANDSF.

The device according to claim 7, wherein the device further comprises:

The second sending module is configured to send an access network information request message to the selected V-ANDSF according to the V-ANDSF parameter after the receiving module receives the ANDSF network element selection response message.

The device according to claim 8, wherein the second sending module comprises: a query unit, configured to: when the V-ANDSF parameter is the V-ANDSF-SN, use the V-ANDSF-SN to perform dynamic host setup protocol DHCP query or domain name system DNS query to obtain the address of the V-ANDSF ;

And a sending unit, configured to send the access network information request message to the V-ANDSF according to the address of the V-ANDSF.

10. A device for selecting a V-ANDSF, located in a home access network discovery and selection function H-ANDSF, is applied to a scenario in which a user equipment UE simultaneously accesses a 3GPP access network and a wireless local area network WLAN, wherein the 3GPP The access network and the WLAN respectively deploy different visited access network discovery and selection functions V-ANDSF, including:

a selection module, configured to select a V-ANDSF from the V-ANDSF in the 3GPP access domain and the V-ANDSF in the WLAN domain for the user equipment UE;

The sending module is configured to send an ANDSF network element selection response message to the UE, where the ANDSF network element selection response message carries the V-ANDSF parameter of the selected V-ANDSF.

The device according to claim 10, wherein the device further comprises:

a receiving module, configured to receive an ANDSF network element selection request message from the UE, where the ANDSF network element selection request message includes: a public land mobile network PLMN identity of the 3GPP access network, and the 3GPP connection The technical parameter 1, the PLMN identity 2 of the WLAN, and the access technology parameter 2 of the WLAN.

The device according to claim 10 or 11, wherein the V-ANDSF parameter comprises one of: the V-ANDSF visited access network discovery and selection function server name V-ANDSF-SN, The IP address of the V-ANDSF.

13. The apparatus according to claim 12, wherein the selecting module sequentially selects a V-ANDSF, the WLAN in the 3GPP access domain in sequence in a process of selecting a V-ANDSF for the UE. V-ANDSF within the domain.

An access method of the access network, which is applied to a scenario where the user equipment UE simultaneously accesses the 3GPP access network and the wireless local area network WLAN, where the 3GPP access network and the WLAN respectively deploy different visits The access network discovery and selection function V-ANDSF includes:

Performing, by the UE, a target access network selection and handover decision according to an inter-system mobility policy and/or access network discovery information; The inter-system mobility policy includes one of the following: an interworking wireless local area network I-WLAN preferred access node, a public land mobile network PLMN domain leaf;

The access network discovery information includes: the PLMN domain leaf.

15. The method according to claim 14, wherein the I-WLAN selective access node further comprises at least one of the following -

I-WLAN home public land mobile network HPLMN priority level indication leaf, HPLMN direct access leaf, I-WLAN peer-to-peer public land mobile network EHPLMN display indication leaf, preferred roaming list node, wherein the preferred roaming list node The method includes: the PLMN domain leaf, a PLMN priority leaf, a service set identifier SSID leaf, and an SSID priority leaf.

16. The method according to claim 14 or 15, wherein the PLMN in the PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with a home carrier.

An access device of the access network, located in the user equipment UE, is applied to a scenario in which the UE accesses the 3GPP access network and the WLAN in the WLAN at the same time, where the 3GPP access network and the WLAN are respectively deployed. Different visited access network discovery and selection functions V-ANDSF, including:

The processing module is configured to perform target access network selection and handover decisions according to an inter-system mobility policy and/or access network discovery information;

The inter-system mobility policy includes one of the following: an interworking wireless local area network, an I-WLAN preferred access node, and a public land mobile network PLMN domain leaf;

The access network discovery information includes: the PLMN domain leaf.

18. The apparatus according to claim 17, wherein the I-WLAN selective access node further comprises at least one of the following -

The apparatus according to claim 17 or 18, wherein the PLMN in the PLMN domain is a PLMN of a roaming partner operator that has signed a roaming agreement with a home carrier.

An access device of an access network, which is located in an access network discovery and selection function ANDSF, and is applied to a scenario in which a user equipment UE simultaneously accesses a 3GPP access network and a wireless local area network WLAN, where the 3GPP The access network and the WLAN respectively deploy different visited access network discovery and selection functions V-ANDSF, including:

And an indication module, configured to instruct the UE to perform a target access network selection and handover decision according to the inter-system mobility policy and/or the access network discovery information;

The access network discovery information includes: the PLMN domain leaf. The apparatus according to claim 20, wherein the I-WLAN selective access node further comprises at least one of the following -