WO2011003313A1 - Method and system for access network discovery and selection function (andsf) to provide function for selecting access network protocol - Google Patents

Method and system for access network discovery and selection function (andsf) to provide function for selecting access network protocol Download PDF

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Publication number
WO2011003313A1
WO2011003313A1 PCT/CN2010/073527 CN2010073527W WO2011003313A1 WO 2011003313 A1 WO2011003313 A1 WO 2011003313A1 CN 2010073527 W CN2010073527 W CN 2010073527W WO 2011003313 A1 WO2011003313 A1 WO 2011003313A1
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Prior art keywords
access network
andsf
list
access
selection function
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PCT/CN2010/073527
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French (fr)
Chinese (zh)
Inventor
曲爱妍
周晓云
毕以峰
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中兴通讯股份有限公司
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Publication of WO2011003313A1 publication Critical patent/WO2011003313A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/18Selecting a network or a communication service
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface

Definitions

  • the present invention relates to the field of mobile communications, and in particular to a method and system for providing an access network protocol selection function by an Access Network Discovery and Selection Function (ANDSF).
  • ANDSF Access Network Discovery and Selection Function
  • EPS Evolved Packet System
  • E-UTRAN Mobile Management Unit
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • HSS Home Subscriber Server
  • PCRF Policy and The Accounting and Charging Rules Function
  • AAA Authentication, Authorization, Accounting
  • the EPS system supports interworking with a non-3GPP IP access network, wherein the non-3GPP IP access network is divided into a trusted non-3GPP IP access network and an untrusted non-3GPP IP access network, an EPS system.
  • the anchor point with the non-3GPP IP access network is the P-GW.
  • the trusted non-3GPP IP access network can be directly connected to the P-GW through the S2a interface, which supports Proxy Mobile IP (PMIP) protocol and Mobile IPv4 (MIPv4) protocol; Untrusted non-3GPP IP access network needs
  • the evolved packet data gateway (ePDG, Evolved Packet Data Gateway) is connected to the P-GW.
  • the interface between the ePDG and the P-GW is S2b.
  • the interface supports the PMIP protocol.
  • the S2c interface provides the user equipment (UE, User Equipment).
  • UE User Equipment
  • User plane related to P-GW Control and mobility support, the mobility management protocol supported by this interface is the dual-stack mobile IPv6 (DSMIPv6, Moblie IPv6 Support for Dual Stack Hosts and Routers) protocol.
  • DSMIPv6, Moblie IPv6 Support for Dual Stack Hosts and Routers Dual-stack mobile IPv6
  • the MME is responsible for mobility control, non-access stratum signaling processing, and user mobility management context (such as mobility management status, user security parameters, etc.) management and other control plane related operations;
  • S-GW is connected to E-UTRAN Incoming gateway device, forwarding data between E-UTRAN and P-GW, and responsible for buffering paging waiting data;
  • P-GW is a border gateway of EPS and Packet Data Network (PDN), mainly responsible for PDN The access and the data forwarding between the EPS and the PDN;
  • the PCRF is a policy and charging rule function entity, and the PCRF is connected to the service network protocol (IP, Internet Protocol) service network through the Rx interface to obtain service information, and, in addition, the PCRF It is also connected to the P-GW through the Gx interface, connected to the trusted non-3GPP IP access network through the Gxa interface, and connected to the S-GW through the Gxc interface. It is responsible for initiating the establishment of the IP bearer and guaranteeing the service quality of the service data (
  • ANDSF was proposed in the EPS system of Rel-8.
  • the EPS system can go to the UE through the ANDSF.
  • Provide access network information that is available at its current location, so that the UE can select an appropriate access network according to its own situation.
  • FIG. 2 which is a schematic diagram of the use of the ANDSF in the prior art, the ANDSF is directly connected to the UE through the S14 interface, and the interface supports the Object Management Architecture Device Management (OMA DM).
  • OMA DM Object Management Architecture Device Management
  • FIG. 3 is a flow chart of the operation of the ANDSF in the prior art, including:
  • Step 301 The UE accesses the EPS system.
  • the UE accesses the EPS system through the 3GPP IP access network or the non-3GPP IP access network.
  • Step 302 The UE detects the ANDSF and visits the ANDSF.
  • Step 303 The UE sends an access network request message to the ANDSF, where the request carries UE capability information and UE location information.
  • Step 305 The UE performs the selection and handover decision of the access network according to the access network information and the system mobility policy that are available at the current location.
  • Step 306 The UE initiates handover of the access network according to the foregoing decision.
  • IP Mobility Management Selection is mainly based on the UE capability and the network capability of the access network to select the IP protocol type used by the UE to access an access network, that is, the access network protocol type.
  • the selected access network protocol type is mainly the interface protocol type of S2a, S2b and S2c in the EPS system, and has nothing to do with the selection of the GTP/PMIP protocol of the S5 interface.
  • 4 is a schematic diagram of the use of the IPMS in the prior art, where the gateway may be a P-GW or an S-GW, and is specifically determined according to actual needs.
  • the UE may transmit its network capability to the HSS/AAA during access authentication, and the current access network also transmits its capability to the HSS/AAA; the HSS/AAA determines the interface protocol type of S2a, S2b and S2c in the EPS system; The HSS/AAA returns the determined protocol type result to the gateway, and the corresponding gateway (P-GW or S-GW) initiates an IP connection.
  • the IPMS does not exist in a single network element, but is combined with the AAA server.
  • the EPS supports the UE to switch between multiple access networks according to its own situation, and the UE needs to provide the information about the access network and the selection of the location of the UE. For example, when the UE is registered in the home network or in the equivalent home network, if there are 3GPP IP access networks and non-3GPP IP access networks at the same time, or multiple non-3GPP IP access networks exist at the same time, the UE needs to know itself. Information about the access network at the location and whether access is allowed, such information needs to be provided by ANDSF. Moreover, when the operator provides a new system mobility policy (for example, changing the priority of the network, adding other non-3GPP IP access networks, etc.), the current network is also required to actively provide the policy to the UE.
  • a new system mobility policy for example, changing the priority of the network, adding other non-3GPP IP access networks, etc.
  • the UE accesses the non-3GPP IP interface after the initial access or handover.
  • the access protocol of the UE can be selected based on two methods: First, the access network protocol type and the roaming protocol supported by the UE and the access network are preset in the UE and the network through the statically configured IP mobility management mechanism. First, the IPMS selects the access network protocol type based on the UE capability and the network capability of the access network.
  • FIG. 5 is a schematic diagram of a process for a UE to switch to a non-3GPP IP access network in the prior art, including:
  • Step 501 The UE accesses the EPS system through the 3GPP IP access network.
  • Step 502 The UE visits the ANDSF to obtain configuration information of the access network, such as an accessible access network list.
  • Step 503 The UE initiates a handover to the non-3GPP IP access network.
  • the UE may initiate handover to a non-3GPP IP access network according to actual needs (such as wireless signal strength issues, user needs).
  • Step 504 The UE selects a non-3GPP IP access network that needs to be accessed from the configuration information of the access network.
  • Step 505 Perform access authentication, and perform step 506 when the authentication is passed.
  • Step 506 The IPMS determines an access network protocol type based on network capabilities of the UE and the access network. Steps 507-508, determining whether the UE and the access network protocol type supported by the access network match, if not, the service connection of the UE is interrupted; if yes, step 509 is performed.
  • Step 509 Perform a subsequent handover procedure, the UE accesses the non-3GPP IP access network, and accesses the EPS system through the non-3GPP IP access network.
  • the UE when the UE performs the access network handover, the UE does not match the access network protocol type supported by the access network, and the service connection of the UE is interrupted, so that the service currently used by the user is accessed by the network. Switch and not continue to use. There are two situations in which the service connection of the UE is interrupted. In one case, when only the statically configured IP mobility management mechanism is deployed in the network, if the type of access protocol supported by the UE and the network does not match, it may be The UE only obtains the IP address, and cannot establish a PDN connection in the network, so that the service connection of the UE is interrupted.
  • the UE cannot establish a PDN connection with the network, which causes the service connection of the UE to be interrupted.
  • the IPMS determines that the access network protocol type is PMIP. However, the PMIP protocol requires the UE to have the IP address reservation capability. If the UE does not report any capability information when the access authentication is performed, and the UE does not have the IP address reservation capability, the service connection of the UE is interrupted. Summary of the invention
  • the main purpose of the present invention is to provide a method and system for the ANDSF to provide an access network protocol selection function, which can solve the access network protocol type supported by the UE and the access network when the UE performs the access network handover.
  • Business interruption caused by inconsistency is to provide a method and system for the ANDSF to provide an access network protocol selection function, which can solve the access network protocol type supported by the UE and the access network when the UE performs the access network handover.
  • the present invention provides a method for an ANDSF to provide an access network protocol selection function, the method comprising:
  • An access network discovery and selection function unit generates an access network list according to an access network request message sent by a user equipment (UE);
  • the UE selects an access network from the list of access networks according to the type of access network protocol supported by the UE, and initiates handover to the selected access network.
  • the UE sends an access network request message, which is specifically:
  • the UE accesses an evolved packet system (EPS) system through the current access network, and detects the ANDSF;
  • EPS evolved packet system
  • the UE sends an access network request message to the ANDSF.
  • the access network request message includes at least UE location information and an access network protocol type supported by the UE.
  • the access network request message includes at least UE location information.
  • the ANDSF generates an access network list, specifically: the ANDSF is based on the UE bit
  • the access information and the type of access network protocol supported by the UE generate the access network list;
  • the access network list at least includes: an access network, an access network protocol type supported by the access network, and the connection Priority of access to the network;
  • the access network protocol type supported by the access network in the access network list is an access network protocol type supported by the UE.
  • the method further includes: the ANDSF setting a priority of the access network in the access network list according to the UE location information.
  • the method further includes:
  • an access network request response message to the UE includes at least the access network list
  • the UE selects the access network, specifically: the UE selects the access network with the highest priority from the access network list.
  • the ANDSF generates an access network list, specifically: the ANDSF generates the access network list according to the UE location information;
  • the access network list includes at least: an access network available for the current location of the UE, and an access network protocol type supported by the access network.
  • the method further includes:
  • the access network request response message includes at least the access network list and a latest system mobility policy
  • the UE selects an access network, specifically: the UE selects an access network that matches an access network protocol type supported by the UE from the access network list; the UE further relies on the latest system.
  • the mobility policy selects an access network from the matched access networks.
  • the present invention further provides a system in which an ANDSF provides an access network protocol selection function, and the system includes: an ANDSF and a UE, where The ANDSF is configured to generate an access network list according to the access network request message sent by the UE;
  • the UE is configured to send an access network request response message to the ANDSF, and is further configured to select an access network from the access network list according to an access network protocol type supported by the UE, and initiate the selection to the Switching of the access network.
  • the UE actively reports its own location information and the access network protocol type information supported by the ANDSF to the ANDSF; the ANDSF generates an access network list according to the above information, and returns to the UE, and thus, in the access network list
  • the access network can support the access network protocol type supported by the UE.
  • the UE may first select a matching access network from the access network list according to the access network protocol type, and then perform the In this manner, when the UE performs the access network handover, the UE may avoid the access failure of the UE due to the inconsistency of the access network protocol type supported by the access network, thereby causing the UE to be interrupted.
  • FIG. 1 is a schematic diagram of an EPS system and an access network architecture in the prior art
  • FIG. 5 is a schematic flowchart of a method for a UE to switch to a non-3GPP IP access network in the prior art
  • FIG. 6 is a schematic flowchart of a method for providing an access network protocol selection function by the ANDSF according to the present invention
  • FIG. 8 is a flow chart of a method for providing an access network protocol selection function by the ANDSF according to the present invention.
  • FIG. 9 is a schematic structural diagram of a system for providing an access network protocol selection function by an ANDSF according to the present invention. detailed description
  • the method for providing the access network protocol selection function of the present invention includes: Step 601: The ANDSF generates an access network list according to the access network request message sent by the UE. Step 602: The UE according to the access network supported by the UE The protocol type selects an access network from the list of access networks;
  • Step 603 The UE initiates handover to the selected access network.
  • FIG. 7 is a flowchart of a method for providing an access network protocol selection function by the ANDSF according to the present invention, where the process includes:
  • the UE accesses the EPS system.
  • the UE accesses the EPS system through the current access network, such as a 3GPP IP access network or a non-3GPP IP access network.
  • the current access network such as a 3GPP IP access network or a non-3GPP IP access network.
  • the UE detects the ANDSF.
  • the UE detects the ANDSF in the EPS system and visits the ANDSF. This will not be repeated here for the prior art.
  • the UE sends an access network request message to the ANDSF.
  • the UE After detecting the ANDSF, the UE sends an access network request message to the ANDSF.
  • the message includes at least: UE location information (UE Location) and an access network protocol type supported by the UE.
  • UE Location UE location information
  • an access network protocol type supported by the UE may be carried in the UE Capabilities, and the message may further include information such as the current access network type (Access Type) of the UE.
  • the ANDSF generates an access network list.
  • the ANDSF generates an access network list according to the UE location information reported by the UE and the access network protocol type supported by the UE.
  • the ANDSF may detect an access network (except the current access network) available to the current location of the UE according to the current location information of the UE, and generate an access network list.
  • the available connection according to the location information of the UE Set the priority to the network. For example, you can set the access network with the closest distance to the current UE as the highest priority. The access network that is farthest from the current UE has the lowest priority. Of course, you can have other priorities as needed. Level setting method. Table 1 shows the list of access networks generated based on the location information of the UE:
  • the ANDSF needs to generate an access network list according to the access network protocol type supported by the UE.
  • the supported access network protocol type supported by the UE is PMIP, that is, supported by the UE.
  • the access network protocol type is PMIP, and the access network included in the access network list finally generated by the ANDSF must be able to support the PMIP protocol.
  • the access network protocol type supported by the UE is PMIP, and the list of access networks finally generated by the ANDSF is as shown in Table 2:
  • the ANDSF sends an access network request response message to the UE.
  • the ANDSF After generating the access network list, the ANDSF sends an access network request response message to the UE, where the message carries at least the generated access network list.
  • the UE performs an access network selection and a handover decision.
  • the UE selects an access network to access according to the received access network list according to its own needs, and decides to perform handover of the access network.
  • the UE initiates handover of the access network.
  • the UE initiates a handover from the current access network to the access network to be accessed. This step is an existing processing method and will not be described here.
  • the UE actively reports its own location information and the access network protocol type information supported by the ANDSF to the ANDSF; the ANDSF generates an access network list according to the information reported by the UE, and returns to the UE;
  • the access network in the list can support the access network protocol type supported by the UE. Therefore, when the UE performs the access network handover, the UE does not have an inconsistent access network protocol type supported by the access network. The access fails, causing the UE's service to be interrupted.
  • FIG. 8 is a flow chart showing a method for providing an access network protocol selection function by the ANDSF according to the present invention. The process includes:
  • the UE accesses the EPS system.
  • Steps 801 to 802 are the same as steps 701 to 702, and are not described herein again.
  • the UE sends an access network request message to the ANDSF.
  • the UE After detecting the ANDSF, the UE sends an access network request message to the ANDSF, and the message includes at least: the location information of the UE, and may also include the current access network type and UE capability information of the UE.
  • the ANDSF generates an access network list.
  • the ANDSF generates an access network list according to the UE location information reported by the UE, where the list includes at least an access network (excluding the current access network) available to the current location of the UE, and an access network protocol type supported by the access network.
  • the ANDSF sends an access network request response message to the UE.
  • the ANDSF After generating the access network list, the ANDSF sends an access network request response message to the UE, where the message carries at least the generated access network list and the latest system mobility policy.
  • the UE performs an access network selection and handover decision according to an access network protocol type supported by the UE and an access network list generated by the ANDSF and an access network protocol type supported by the access network.
  • the UE selects an access network that matches the type of the access network supported by the AS, according to the access network protocol type supported by the UE, and the access network that matches the type of the access network supported by the UE, if there are multiple, according to the latest
  • the system mobility policy selects an appropriate access network, such as selecting the access network with less current burden according to the latest system mobility policy.
  • the UE initiates handover of the access network.
  • This step is the same as the processing of step 707, and details are not described herein again.
  • the UE needs to select a matching access network according to the access network protocol type, and then select an appropriate access network from the matched access network according to the latest system mobility policy.
  • the handover is performed.
  • the access network protocol type supported by the UE and the access network may be inconsistent, and the access failure may be caused.
  • the present invention provides a system for providing an access network protocol selection function by the ANDSF.
  • the system includes: an ANDSF 10 and a UE 20, where
  • the ANDSF 10 is configured to generate an access network list according to the access network request message sent by the UE 20;
  • the UE 20 is configured to send an access network request response message to the ANDSF 10, and is further configured to select an access network from the access network list according to the type of the access network protocol supported by the UE, and initiate a handover to the selected access network.

Abstract

A method for an Access Network Discovery and Selection Function (ANDSF) to provide a function for selecting an access network protocol is provided, which comprises: the ANDSF creates a list of access networks according to an access network request message sent by a User Equipment (UE) (601); and the UE selects an access network from the list of access networks based on the types of the access network protocols supported by itself (602), and initiates a handoff to the selected access network (603). A system for an ANDSF to provide a function for selecting an access network protocol is also provided. The method and system can solve the problem of service interruption caused by the inconsistency of the types of the access network protocols supported by the UE and the access network when the UE is handing off between the access networks.

Description

一种 ANDSF提供接入网协议选择功能的方法和系统 技术领域  Method and system for providing access network protocol selection function by ANDSF
本发明涉及移动通信领域, 特别是指一种接入网发现和选择功能单元 ( ANDSF, Access Network Discovery and Selection Function )提供接入网协 议选择功能的方法和系统。 背景技术  The present invention relates to the field of mobile communications, and in particular to a method and system for providing an access network protocol selection function by an Access Network Discovery and Selection Function (ANDSF). Background technique
第三代合作伙伴计划 (3GPP, 3rd Generation Partnership Project )演进 分组系统( EPS, Evolved Packet System ), 由演进的通用移动通信系统陆地 无线接入网 ( E-UTRAN , Evolved Universal Terrestrial Radio Access Network ), 移动管理单元 ( MME, Mobility Management Entity )、 服务网关 ( S-GW, Serving Gateway )、分组数据网络网关( P-GW、 Packet Data Network Gateway ), 归属用户服务器(HSS, Home Subscriber Server ), 策略和计费 规则功能实体(PCRF, Policy and Charging Rules Function )及其他支撑节 点组成、 如 3 GPP认证授权计中艮 ( AAA, Authentication, Authorization, Accounting )服务器, 图 1为现有技术中 EPS系统及接入网架构示意图。  The 3rd Generation Partnership Project (EPS) Evolved Packet System (EPS), the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Mobile Management Unit (MME, Mobility Management Entity), Serving Gateway (S-GW, Serving Gateway), Packet Data Network Gateway (P-GW, Packet Data Network Gateway), Home Subscriber Server (HSS), Policy and The Accounting and Charging Rules Function (PCRF) and other supporting nodes are composed, such as the AAA (Authentication, Authorization, Accounting) server. Figure 1 shows the EPS system in the prior art. Schematic diagram of the network access architecture.
如图 1所示, EPS系统支持与非 3GPP IP接入网的互通,其中,非 3GPP IP接入网被分为可信任非 3GPP IP接入网和不可信任非 3GPP IP接入网, EPS系统与非 3GPP IP接入网间的锚点为 P-GW。可信任非 3GPP IP接入网 可直接通过 S2a接口与 P-GW相连, 该接口支持代理移动 IP ( PMIP, Proxy Mobile IP )协议和移动 IPv4 ( MIPv4 )协议; 不可信任非 3GPP IP接入网需 经过演进的分组数据网关( ePDG, Evolved Packet Data Gateway )与 P-GW 相连, ePDG与 P-GW之间的接口为 S2b, 该接口支持 PMIP协议; S2c接 口提供了用户设备 ( UE , User Equipment )与 P-GW之间的用户面相关的 控制和移动性支持, 该接口支持的移动性管理协议为支持双栈的移动 IPv6 ( DSMIPv6, Moblie IPv6 Support for Dual Stack Hosts and Routers )协议。 As shown in FIG. 1, the EPS system supports interworking with a non-3GPP IP access network, wherein the non-3GPP IP access network is divided into a trusted non-3GPP IP access network and an untrusted non-3GPP IP access network, an EPS system. The anchor point with the non-3GPP IP access network is the P-GW. The trusted non-3GPP IP access network can be directly connected to the P-GW through the S2a interface, which supports Proxy Mobile IP (PMIP) protocol and Mobile IPv4 (MIPv4) protocol; Untrusted non-3GPP IP access network needs The evolved packet data gateway (ePDG, Evolved Packet Data Gateway) is connected to the P-GW. The interface between the ePDG and the P-GW is S2b. The interface supports the PMIP protocol. The S2c interface provides the user equipment (UE, User Equipment). User plane related to P-GW Control and mobility support, the mobility management protocol supported by this interface is the dual-stack mobile IPv6 (DSMIPv6, Moblie IPv6 Support for Dual Stack Hosts and Routers) protocol.
MME 负责移动性管理、 非接入层信令的处理和用户移动管理上下文 (如移动性管理状态、 用户安全参数等)管理等控制面的相关工作; S-GW 是与 E-UTRAN相连的接入网关设备,在 E-UTRAN和 P-GW之间转发数据, 并且负责对寻呼等待数据进行緩存; P-GW是 EPS与分组数据网络( PDN, Packet Data Network )的边界网关, 主要负责 PDN的接入以及 EPS与 PDN 之间的数据转发等; PCRF是策略和计费规则功能实体, PCRF通过 Rx接 口和运营商网络协议 ( IP, Internet Protocol )业务网络相连, 获取业务信息, 此外, PCRF还通过 Gx接口与 P-GW相连、通过 Gxa接口与可信任非 3GPP IP接入网相连、 通过 Gxc接口与 S-GW相连, 负责发起 IP承载的建立, 保 证业务数据的服务质量(QoS, Quality of Service ), 并进行计费控制。  The MME is responsible for mobility control, non-access stratum signaling processing, and user mobility management context (such as mobility management status, user security parameters, etc.) management and other control plane related operations; S-GW is connected to E-UTRAN Incoming gateway device, forwarding data between E-UTRAN and P-GW, and responsible for buffering paging waiting data; P-GW is a border gateway of EPS and Packet Data Network (PDN), mainly responsible for PDN The access and the data forwarding between the EPS and the PDN; the PCRF is a policy and charging rule function entity, and the PCRF is connected to the service network protocol (IP, Internet Protocol) service network through the Rx interface to obtain service information, and, in addition, the PCRF It is also connected to the P-GW through the Gx interface, connected to the trusted non-3GPP IP access network through the Gxa interface, and connected to the S-GW through the Gxc interface. It is responsible for initiating the establishment of the IP bearer and guaranteeing the service quality of the service data (QoS, Quality). Of Service ), and charge control.
ANDSF是在 Rel-8的 EPS系统中提出的。 当 UE在归属网或者在等价 归属网注册的时候,如果同时存在 3GPP IP接入网和非 3GPP IP接入网、或 者同时存在多个非 3GPP IP接入网, EPS系统可通过 ANDSF向 UE提供其 当前所在位置可用的接入网信息,以便 UE能够根据自身情况选择合适的接 入网。如图 2所示,为现有技术中 ANDSF的使用示意图, ANDSF通过 S14 接口与 UE直接相连, 该接口支持对象管理体系结构设备管理( OMA DM , Object Management Architecture Device Management )十办议。  ANDSF was proposed in the EPS system of Rel-8. When the UE is registered in the home network or in the equivalent home network, if there are both a 3GPP IP access network and a non-3GPP IP access network, or multiple non-3GPP IP access networks exist at the same time, the EPS system can go to the UE through the ANDSF. Provide access network information that is available at its current location, so that the UE can select an appropriate access network according to its own situation. As shown in FIG. 2, which is a schematic diagram of the use of the ANDSF in the prior art, the ANDSF is directly connected to the UE through the S14 interface, and the interface supports the Object Management Architecture Device Management (OMA DM).
图 3为现有技术中 ANDSF的工作流程图, 包括:  Figure 3 is a flow chart of the operation of the ANDSF in the prior art, including:
步驟 301 : UE接入 EPS系统。  Step 301: The UE accesses the EPS system.
UE通过 3GPP IP接入网或非 3GPP IP接入网接入到 EPS系统; 步驟 302: UE检测到 ANDSF, 并拜访 ANDSF。  The UE accesses the EPS system through the 3GPP IP access network or the non-3GPP IP access network. Step 302: The UE detects the ANDSF and visits the ANDSF.
步驟 303: UE向 ANDSF发送接入网请求消息, 该请求中携带 UE能 力信息和 UE位置信息。 步驟 304: ANDSF根据上述 UE位置信息和 UE能力信息, 向 UE发送 接入网请求响应消息,该消息中携带有 UE当前位置可用的接入网信息和最 新的系统移动策略。 Step 303: The UE sends an access network request message to the ANDSF, where the request carries UE capability information and UE location information. Step 304: The ANDSF sends an access network request response message to the UE according to the foregoing UE location information and the UE capability information, where the message carries the access network information and the latest system mobility policy that are available to the current location of the UE.
步驟 305: UE依据当前位置可用的接入网信息和系统移动策略, 进行 接入网的选择和切换决定。  Step 305: The UE performs the selection and handover decision of the access network according to the access network information and the system mobility policy that are available at the current location.
步驟 306: UE依据上述决定发起接入网的切换。  Step 306: The UE initiates handover of the access network according to the foregoing decision.
IP移动管理选择 ( IPMS, IP Mobility management Selection )主要是依 据 UE能力和接入网的网络能力选择 UE接入某个接入网时使用的 IP协议 类型、 即接入网协议类型, 其中, 所选择的接入网协议类型主要是 EPS系 统中 S2a、 S2b和 S2c的接口协议类型, 与 S5接口的 GTP/PMIP协议的选 择无关。 图 4为现有技术中 IPMS的使用示意图,其中, 网关可以是 P-GW, 也可以是 S-GW, 具体的根据实际需要来确定。 UE可以将其网络能力在接 入鉴权时传送给 HSS/AAA, 当前接入网也将其能力传送给 HSS/AAA; 由 HSS/AAA决定 EPS系统中 S2a、 S2b和 S2c的接口协议类型;然后 HSS/AAA 将决定的协议类型结果返回给网关, 由相应网关( P-GW或 S-GW )发起 IP 连接。 当前的 EPS 系统中, IPMS并不存在于一个单独的网元中, 而是与 AAA服务器合设。  The IP Mobility Management Selection (IPMS) is mainly based on the UE capability and the network capability of the access network to select the IP protocol type used by the UE to access an access network, that is, the access network protocol type. The selected access network protocol type is mainly the interface protocol type of S2a, S2b and S2c in the EPS system, and has nothing to do with the selection of the GTP/PMIP protocol of the S5 interface. 4 is a schematic diagram of the use of the IPMS in the prior art, where the gateway may be a P-GW or an S-GW, and is specifically determined according to actual needs. The UE may transmit its network capability to the HSS/AAA during access authentication, and the current access network also transmits its capability to the HSS/AAA; the HSS/AAA determines the interface protocol type of S2a, S2b and S2c in the EPS system; The HSS/AAA returns the determined protocol type result to the gateway, and the corresponding gateway (P-GW or S-GW) initiates an IP connection. In the current EPS system, the IPMS does not exist in a single network element, but is combined with the AAA server.
目前, EPS支持 UE根据自身情况在多个接入网之间进行切换, 而 UE 如何获取自身所在位置的接入网情况及选择等信息, 则需要 ANDSF向 UE 提供。 如: 当 UE在归属网或者在等价归属网注册的时候, 如果同时存在 3GPP IP接入网和非 3GPP IP接入网、 或者同时存在多个非 3GPP IP接入网 时, UE需要知道自身所处位置的接入网情况及是否允许接入等信息, 这些 信息需要由 ANDSF提供。 而且, 当运营商提供了新的系统移动策略(如, 更改了网络的优先级, 增加了其他非 3GPP IP接入网等) 时, 也需要当前 网络主动将该策略提供给 UE。 而 UE初始接入或切换后接入非 3GPP IP接 入网时,可以基于两种方法对 UE的接入协议进行选择: 一是通过静态配置 的 IP移动管理机制将 UE和接入网支持的接入网协议类型和漫游协议预先 设置在 UE和网络中; 一是由 IPMS基于 UE能力和接入网的网络能力对接 入网协议类型进行选择。 Currently, the EPS supports the UE to switch between multiple access networks according to its own situation, and the UE needs to provide the information about the access network and the selection of the location of the UE. For example, when the UE is registered in the home network or in the equivalent home network, if there are 3GPP IP access networks and non-3GPP IP access networks at the same time, or multiple non-3GPP IP access networks exist at the same time, the UE needs to know itself. Information about the access network at the location and whether access is allowed, such information needs to be provided by ANDSF. Moreover, when the operator provides a new system mobility policy (for example, changing the priority of the network, adding other non-3GPP IP access networks, etc.), the current network is also required to actively provide the policy to the UE. The UE accesses the non-3GPP IP interface after the initial access or handover. When accessing the network, the access protocol of the UE can be selected based on two methods: First, the access network protocol type and the roaming protocol supported by the UE and the access network are preset in the UE and the network through the statically configured IP mobility management mechanism. First, the IPMS selects the access network protocol type based on the UE capability and the network capability of the access network.
图 5所示为现有技术中 UE向非 3GPP IP接入网切换的流程示意图,包 括:  FIG. 5 is a schematic diagram of a process for a UE to switch to a non-3GPP IP access network in the prior art, including:
步驟 501 , UE通过 3GPP IP接入网接入 EPS系统。  Step 501: The UE accesses the EPS system through the 3GPP IP access network.
步驟 502, UE拜访 ANDSF获取接入网的配置信息、 如可接入的接入 网列表。  Step 502: The UE visits the ANDSF to obtain configuration information of the access network, such as an accessible access network list.
步驟 503 , UE向非 3GPP IP接入网发起切换。 UE可以根据实际的需要 (如无线信号强度问题、 用户需要)发起向非 3GPP IP接入网的切换。  Step 503: The UE initiates a handover to the non-3GPP IP access network. The UE may initiate handover to a non-3GPP IP access network according to actual needs (such as wireless signal strength issues, user needs).
步驟 504 , UE从接入网的配置信息中选择需要接入的非 3GPP IP接入 网。  Step 504: The UE selects a non-3GPP IP access network that needs to be accessed from the configuration information of the access network.
步驟 505, 进行接入鉴权, 并在鉴权通过时执行步驟 506。  Step 505: Perform access authentication, and perform step 506 when the authentication is passed.
步驟 506, IPMS基于 UE和接入网的网络能力决定接入网协议类型。 步驟 507~508, 判断 UE与接入网支持的接入网协议类型是否匹配, 如 果否, 则 UE的业务连接中断; 如果是, 执行步驟 509。  Step 506: The IPMS determines an access network protocol type based on network capabilities of the UE and the access network. Steps 507-508, determining whether the UE and the access network protocol type supported by the access network match, if not, the service connection of the UE is interrupted; if yes, step 509 is performed.
步驟 509, 执行后续切换流程, UE接入非 3GPP IP接入网, 并通过该 非 3GPP IP接入网接入 EPS系统。  Step 509: Perform a subsequent handover procedure, the UE accesses the non-3GPP IP access network, and accesses the EPS system through the non-3GPP IP access network.
由此可见, UE在进行接入网切换时, 会由于 UE与接入网支持的接入 网协议类型不匹配, 而导致 UE的业务连接中断,从而使用户当前使用的业 务由于接入网的切换而不能继续使用。上述导致 UE的业务连接中断的情况 有两种: 一种情况是, 当网络中只部署了静态配置的 IP移动管理机制时, 如果 UE和网络支持的接入协议类型不匹配, 则有可能使 UE只获取到 IP 地址, 而无法在网络中建立起 PDN连接, 从而使 UE的业务连接中断, 例 如: UE只支持 DSMIP协议, 而网络不支持 DSMIP协议时, UE不能与网 络建立 PDN连接, 从而导致 UE的业务连接中断; 另一种情况是, 当网络 中部署有 IPMS时,若 UE只支持 DSMIP协议,而网络不支持 DSMIP协议, 此时 IPMS决定接入网协议类型为 PMIP协议。 但是 PMIP协议要求 UE具 有 IP地址保留能力, 如果在执行接入鉴权时 UE没有上报任何能力信息, 并且 UE又没有 IP地址保留能力, 则会造成 UE的业务连接中断。 发明内容 It can be seen that when the UE performs the access network handover, the UE does not match the access network protocol type supported by the access network, and the service connection of the UE is interrupted, so that the service currently used by the user is accessed by the network. Switch and not continue to use. There are two situations in which the service connection of the UE is interrupted. In one case, when only the statically configured IP mobility management mechanism is deployed in the network, if the type of access protocol supported by the UE and the network does not match, it may be The UE only obtains the IP address, and cannot establish a PDN connection in the network, so that the service connection of the UE is interrupted. For example, if the UE only supports the DSMIP protocol, and the network does not support the DSMIP protocol, the UE cannot establish a PDN connection with the network, which causes the service connection of the UE to be interrupted. In another case, when the IPMS is deployed in the network, if the UE only supports The DSMIP protocol, and the network does not support the DSMIP protocol. At this time, the IPMS determines that the access network protocol type is PMIP. However, the PMIP protocol requires the UE to have the IP address reservation capability. If the UE does not report any capability information when the access authentication is performed, and the UE does not have the IP address reservation capability, the service connection of the UE is interrupted. Summary of the invention
有鉴于此,本发明的主要目的在于提供一种 ANDSF提供接入网协议选 择功能的方法和系统,能够解决 UE在进行接入网切换时的由于 UE与接入 网支持的接入网协议类型不一致而导致的业务中断问题。  In view of this, the main purpose of the present invention is to provide a method and system for the ANDSF to provide an access network protocol selection function, which can solve the access network protocol type supported by the UE and the access network when the UE performs the access network handover. Business interruption caused by inconsistency.
为达到上述目的, 本发明的技术方案是这样实现的:  In order to achieve the above object, the technical solution of the present invention is achieved as follows:
本发明提供了一种 ANDSF提供接入网协议选择功能的方法,该方法包 括:  The present invention provides a method for an ANDSF to provide an access network protocol selection function, the method comprising:
接入网发现和选择功能单元(ANDSF )依据用户设备 ( UE )发送的接 入网请求消息生成接入网列表;  An access network discovery and selection function unit (ANDSF) generates an access network list according to an access network request message sent by a user equipment (UE);
UE依据自身支持的接入网协议类型从所述接入网列表中选择接入网, 并发起向所述选择的接入网的切换。  The UE selects an access network from the list of access networks according to the type of access network protocol supported by the UE, and initiates handover to the selected access network.
所述 UE发送接入网请求消息, 具体为:  The UE sends an access network request message, which is specifically:
UE 通过当前接入网接入演进分组系统 (EPS ) 系统, 并检测到所述 ANDSF;  The UE accesses an evolved packet system (EPS) system through the current access network, and detects the ANDSF;
UE向所述 ANDSF发送接入网请求消息。  The UE sends an access network request message to the ANDSF.
所述接入网请求消息至少包括 UE位置信息和 UE支持的接入网协议类 型。  The access network request message includes at least UE location information and an access network protocol type supported by the UE.
所述接入网请求消息至少包括 UE位置信息。  The access network request message includes at least UE location information.
所述 ANDSF生成接入网列表, 具体为: 所述 ANDSF依据所述 UE位 置信息和所述 UE支持的接入网协议类型生成所述接入网列表; 所述接入网列表至少包括: 接入网、 所述接入网支持的接入网协议类 型和所述接入网的优先级; The ANDSF generates an access network list, specifically: the ANDSF is based on the UE bit The access information and the type of access network protocol supported by the UE generate the access network list; the access network list at least includes: an access network, an access network protocol type supported by the access network, and the connection Priority of access to the network;
所述接入网列表中的接入网支持的接入网协议类型为所述 UE 支持的 接入网协议类型。  The access network protocol type supported by the access network in the access network list is an access network protocol type supported by the UE.
所述 ANDSF生成接入网列表时, 该方法还包括: 所述 ANDSF依据所 述 UE位置信息设置所述接入网列表中接入网的优先级。  When the ANDSF generates an access network list, the method further includes: the ANDSF setting a priority of the access network in the access network list according to the UE location information.
所述 ANDSF生成接入网列表之后, 该方法还包括:  After the ANDSF generates the access network list, the method further includes:
所述 ADNSF向所述 UE返回接入网请求响应消息;所述接入网请求响 应消息至少包括所述接入网列表;  Returning, by the ADNSF, an access network request response message to the UE; the access network request response message includes at least the access network list;
相应的, UE选择接入网, 具体为: 所述 UE从所述接入网列表中选取 所述优先级最高的接入网。  Correspondingly, the UE selects the access network, specifically: the UE selects the access network with the highest priority from the access network list.
所述 ANDSF生成接入网列表, 具体为: 所述 ANDSF依据所述 UE位 置信息生成所述接入网列表;  The ANDSF generates an access network list, specifically: the ANDSF generates the access network list according to the UE location information;
所述接入网列表至少包括: UE当前位置可用的接入网、 和所述接入网 支持的接入网协议类型。  The access network list includes at least: an access network available for the current location of the UE, and an access network protocol type supported by the access network.
所述 ANDSF生成接入网列表之后, 该方法还包括:  After the ANDSF generates the access network list, the method further includes:
所述 ADNSF向所述 UE返回接入网请求响应消息;  Returning, by the ADNSF, an access network request response message to the UE;
所述接入网请求响应消息至少包括所述接入网列表和最新的系统移动 策略;  The access network request response message includes at least the access network list and a latest system mobility policy;
相应的, UE选择接入网, 具体为: 所述 UE从所述接入网列表中选取 与自身所支持的接入网协议类型匹配的接入网;所述 UE进一步依据所述最 新的系统移动策略从所述匹配的接入网中选择接入网。  Correspondingly, the UE selects an access network, specifically: the UE selects an access network that matches an access network protocol type supported by the UE from the access network list; the UE further relies on the latest system. The mobility policy selects an access network from the matched access networks.
本发明还提供了一种 ANDSF提供接入网协议选择功能的系统,该系统 包括: ANDSF和 UE, 其中, 所述 ANDSF, 用于依据所述 UE发送的接入网请求消息生成接入网列 表; The present invention further provides a system in which an ANDSF provides an access network protocol selection function, and the system includes: an ANDSF and a UE, where The ANDSF is configured to generate an access network list according to the access network request message sent by the UE;
所述 UE, 用于向所述 ANDSF发送接入网请求响应消息; 还用于依据 自身支持的接入网协议类型从所述接入网列表中选择接入网, 并发起向所 述选择的接入网的切换。  The UE is configured to send an access network request response message to the ANDSF, and is further configured to select an access network from the access network list according to an access network protocol type supported by the UE, and initiate the selection to the Switching of the access network.
本发明的方案中, UE向 ANDSF主动上报自身的位置信息和自身所支 持的接入网协议类型信息; ANDSF依据上述信息生成接入网列表, 并向 UE返回 , 如此 , 该接入网列表中的接入网都可以支持 UE所支持的接入网 协议类型; 另夕卜,本发明中 UE也可以先依据接入网协议类型从接入网列表 中选择匹配的接入网后, 再进行切换; 如此, UE在进行接入网切换时, 就 可以避免因为与接入网支持的接入网协议类型不一致,而导致 UE的接入失 败, 从而致使 UE的业务中断。 附图说明  In the solution of the present invention, the UE actively reports its own location information and the access network protocol type information supported by the ANDSF to the ANDSF; the ANDSF generates an access network list according to the above information, and returns to the UE, and thus, in the access network list The access network can support the access network protocol type supported by the UE. In addition, in the present invention, the UE may first select a matching access network from the access network list according to the access network protocol type, and then perform the In this manner, when the UE performs the access network handover, the UE may avoid the access failure of the UE due to the inconsistency of the access network protocol type supported by the access network, thereby causing the UE to be interrupted. DRAWINGS
图 1为现有技术中 EPS系统及接入网架构示意图;  1 is a schematic diagram of an EPS system and an access network architecture in the prior art;
图 2为现有技术中 ANDSF的使用示意图;  2 is a schematic diagram of the use of ANDSF in the prior art;
图 3为现有技术中 ANDSF的工作流程图;  3 is a working flow chart of the ANDSF in the prior art;
图 4为现有技术中 IPMS的使用示意图;  4 is a schematic diagram of the use of an IPMS in the prior art;
图 5为现有技术中 UE向非 3GPP IP接入网切换的流程示意图; 图 6本发明 ANDSF提供接入网协议选择功能的方法流程示意图; 图 7为本发明 ANDSF提供接入网协议选择功能实施例一的方法流程 图;  FIG. 5 is a schematic flowchart of a method for a UE to switch to a non-3GPP IP access network in the prior art; FIG. 6 is a schematic flowchart of a method for providing an access network protocol selection function by the ANDSF according to the present invention; FIG. Flow chart of the method of the first embodiment;
图 8为本发明 ANDSF提供接入网协议选择功能实施例一的方法流程 图;  8 is a flow chart of a method for providing an access network protocol selection function by the ANDSF according to the present invention;
图 9为本发明 ANDSF提供接入网协议选择功能的系统结构示意图。 具体实施方式 FIG. 9 is a schematic structural diagram of a system for providing an access network protocol selection function by an ANDSF according to the present invention. detailed description
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 本发明 ANDSF提供接入网协议选择功能的方法如图 6所示, 包括: 步驟 601 , ANDSF依据 UE发送的接入网请求消息生成接入网列表; 步驟 602, UE依据自身支持的接入网协议类型从接入网列表中选择接 入网;  The technical solutions of the present invention are further elaborated below in conjunction with the accompanying drawings and specific embodiments. As shown in FIG. 6, the method for providing the access network protocol selection function of the present invention includes: Step 601: The ANDSF generates an access network list according to the access network request message sent by the UE. Step 602: The UE according to the access network supported by the UE The protocol type selects an access network from the list of access networks;
步驟 603 , UE发起向选择的接入网的切换。  Step 603: The UE initiates handover to the selected access network.
下面通过具体的实施例来说明上述方法。  The above method will be described below by way of specific examples.
图 7所示为本发明 ANDSF提供接入网协议选择功能实施例一的方法流 程图, 该流程包括:  FIG. 7 is a flowchart of a method for providing an access network protocol selection function by the ANDSF according to the present invention, where the process includes:
701 , UE接入 EPS系统。  701. The UE accesses the EPS system.
UE通过当前接入网、 如 3GPP IP接入网或非 3GPP IP接入网等接入到 EPS系统。  The UE accesses the EPS system through the current access network, such as a 3GPP IP access network or a non-3GPP IP access network.
702, UE检测到 ANDSF。  702. The UE detects the ANDSF.
UE检测到 EPS系统中的 ANDSF,并拜访 ANDSF。此处为现有技术不 再赘述。  The UE detects the ANDSF in the EPS system and visits the ANDSF. This will not be repeated here for the prior art.
703 , UE向 ANDSF发送接入网请求消息。  703. The UE sends an access network request message to the ANDSF.
UE检测到 ANDSF后, 主动向 ANDSF发送接入网请求消息, 该消息 中至少包含: UE位置信息 (UE Location )和 UE支持的接入网协议类型。 较佳地, UE 支持的接入网协议类型可以携带在 UE 能力信息 (UE Capabilities ) 中, 另夕卜, 该消息还可以包含 UE当前的接入网类型 ( Access Type )等信息。  After detecting the ANDSF, the UE sends an access network request message to the ANDSF. The message includes at least: UE location information (UE Location) and an access network protocol type supported by the UE. Preferably, the access network protocol type supported by the UE may be carried in the UE Capabilities, and the message may further include information such as the current access network type (Access Type) of the UE.
704, ANDSF生成接入网列表。  704. The ANDSF generates an access network list.
ANDSF依据 UE上报的 UE位置信息和 UE支持的接入网协议类型, 生成接入网列表。 ANDSF根据 UE当前的位置信息, 可以检测到 UE当前位置可用的接 入网 (除当前的接入网), 并生成一个接入网列表, 在该列表中, 根据 UE 的位置信息对可用的接入网设置优先级, 例如, 根据需要可以设置与当前 UE距离最近的接入网的优先级最高; 与当前 UE距离最远的接入网的优先 级最低, 当然根据需要还可以有其他的优先级设置方式。 如表 1 所示为依 据 UE的位置信息生成的接入网列表: The ANDSF generates an access network list according to the UE location information reported by the UE and the access network protocol type supported by the UE. The ANDSF may detect an access network (except the current access network) available to the current location of the UE according to the current location information of the UE, and generate an access network list. In the list, the available connection according to the location information of the UE Set the priority to the network. For example, you can set the access network with the closest distance to the current UE as the highest priority. The access network that is farthest from the current UE has the lowest priority. Of course, you can have other priorities as needed. Level setting method. Table 1 shows the list of access networks generated based on the location information of the UE:
表 1  Table 1
另夕卜, ANDSF还需要根据 UE支持的接入网协议类型生成接入网列表, 基于表 1 ,假设 UE上报的 UE能力信息中其支持的接入网协议类型为 PMIP、 即 UE支持的接入网协议类型为 PMIP, 则 ANDSF最终生成的接入网列表 中所包含的接入网必须能够支持 PMIP协议。 基于表 1 , 假设 UE支持的接 入网协议类型为 PMIP, 则 ANDSF最终生成的接入网列表如表 2所示: In addition, the ANDSF needs to generate an access network list according to the access network protocol type supported by the UE. Based on Table 1, it is assumed that the supported access network protocol type supported by the UE is PMIP, that is, supported by the UE. The access network protocol type is PMIP, and the access network included in the access network list finally generated by the ANDSF must be able to support the PMIP protocol. Based on Table 1, it is assumed that the access network protocol type supported by the UE is PMIP, and the list of access networks finally generated by the ANDSF is as shown in Table 2:
表 2  Table 2
705 , ANDSF向 UE发送接入网请求响应消息。  705. The ANDSF sends an access network request response message to the UE.
ANDSF生成接入网列表后, 向 UE发送接入网请求响应消息, 该消息 中至少携带了所述生成的接入网列表。  After generating the access network list, the ANDSF sends an access network request response message to the UE, where the message carries at least the generated access network list.
706 , UE进行接入网选择和切换决定。  706. The UE performs an access network selection and a handover decision.
UE根据自身的需要,基于接收到的接入网列表,选择要接入的接入网, 并决定进行接入网的切换。  The UE selects an access network to access according to the received access network list according to its own needs, and decides to perform handover of the access network.
707, UE发起接入网的切换。 UE发起从当前接入网向要接入的接入网的切换。该步驟为现有处理方 式, 此处不再赘述。 707. The UE initiates handover of the access network. The UE initiates a handover from the current access network to the access network to be accessed. This step is an existing processing method and will not be described here.
在该实施例中, UE向 ANDSF主动上报自身的位置信息和自身所支持 的接入网协议类型信息; ANDSF依据 UE上报的信息生成接入网列表, 并 向 UE返回; 如此, 该接入网列表中的接入网都可以支持 UE所支持的接入 网协议类型, 因此, UE在进行接入网切换时, 就不会因为 UE与接入网支 持的接入网协议类型不一致,而导致的接入失败,从而致使 UE的业务中断。  In this embodiment, the UE actively reports its own location information and the access network protocol type information supported by the ANDSF to the ANDSF; the ANDSF generates an access network list according to the information reported by the UE, and returns to the UE; The access network in the list can support the access network protocol type supported by the UE. Therefore, when the UE performs the access network handover, the UE does not have an inconsistent access network protocol type supported by the access network. The access fails, causing the UE's service to be interrupted.
图 8所示为本发明 ANDSF提供接入网协议选择功能实施例二的方法流 程图, 该流程包括:  FIG. 8 is a flow chart showing a method for providing an access network protocol selection function by the ANDSF according to the present invention. The process includes:
801 , UE接入 EPS系统。  801, the UE accesses the EPS system.
802, 检测到 ANDSF。  802, ANDSF detected.
步驟 801至 802与步驟 701至 702相同, 此处不再赘述。  Steps 801 to 802 are the same as steps 701 to 702, and are not described herein again.
803 , UE向 ANDSF发送接入网请求消息。  803. The UE sends an access network request message to the ANDSF.
UE检测到 ANDSF后, 主动向 ANDSF发送接入网请求消息, 该消息 中至少包含: UE位置信息, 当然还可以包含 UE当前的接入网类型和 UE 能力信息等。  After detecting the ANDSF, the UE sends an access network request message to the ANDSF, and the message includes at least: the location information of the UE, and may also include the current access network type and UE capability information of the UE.
804, ANDSF生成接入网列表。  804. The ANDSF generates an access network list.
ANDSF依据 UE上报的 UE位置信息生成接入网列表, 该列表至少包 含 UE当前位置可用的接入网 (除当前的接入网)、 和接入网支持的接入网 协议类型。  The ANDSF generates an access network list according to the UE location information reported by the UE, where the list includes at least an access network (excluding the current access network) available to the current location of the UE, and an access network protocol type supported by the access network.
805 , ANDSF向 UE发送接入网请求响应消息。  805. The ANDSF sends an access network request response message to the UE.
ANDSF生成接入网列表后, 向 UE发送接入网请求响应消息, 该消息 中至少携带了所述生成的接入网列表和最新的系统移动策略。  After generating the access network list, the ANDSF sends an access network request response message to the UE, where the message carries at least the generated access network list and the latest system mobility policy.
806, UE根据自身支持的接入网协议类型和 ANDSF生成的接入网列表 及接入网支持的接入网协议类型, 进行接入网选择和切换决定。 UE根据自身所支持的接入网协议类型, 从 ANDSF返回的接入网列表 中选取与自身所支持的接入网协议类型匹配、 即一致的接入网, 如果存在 多个, 则依据上述最新的系统移动策略选取合适的接入网, 如根据最新的 系统移动策略, 选择当前负担较小的接入网。 806. The UE performs an access network selection and handover decision according to an access network protocol type supported by the UE and an access network list generated by the ANDSF and an access network protocol type supported by the access network. The UE selects an access network that matches the type of the access network supported by the AS, according to the access network protocol type supported by the UE, and the access network that matches the type of the access network supported by the UE, if there are multiple, according to the latest The system mobility policy selects an appropriate access network, such as selecting the access network with less current burden according to the latest system mobility policy.
807, UE发起接入网的切换。  807. The UE initiates handover of the access network.
该步驟与步驟 707的处理相同此处不再赘述。  This step is the same as the processing of step 707, and details are not described herein again.
由此可见, 该实施例中, UE需要先依据接入网协议类型选择匹配的接 入网后, 再根据最新的系统移动策略从所述匹配的接入网中选取合适的接 入网后再进行切换,如此,也可以避免 UE与接入网支持的接入网协议类型 不一致, 而导致的接入失败。  Therefore, in this embodiment, the UE needs to select a matching access network according to the access network protocol type, and then select an appropriate access network from the matched access network according to the latest system mobility policy. The handover is performed. In this way, the access network protocol type supported by the UE and the access network may be inconsistent, and the access failure may be caused.
为了实现上述方法,本发明提供了一种 ANDSF提供接入网协议选择功 能的系统, 如图 9所示, 该系统包括: ANDSF 10和 UE 20, 其中,  In order to implement the foregoing method, the present invention provides a system for providing an access network protocol selection function by the ANDSF. As shown in FIG. 9, the system includes: an ANDSF 10 and a UE 20, where
ANDSF 10, 用于依据 UE 20发送的接入网请求消息生成接入网列表; The ANDSF 10 is configured to generate an access network list according to the access network request message sent by the UE 20;
UE 20, 用于向 ANDSF 10发送接入网请求响应消息; 还用于依据自身 支持的接入网协议类型从接入网列表中选择接入网, 并发起向选择的接入 网的切换。 The UE 20 is configured to send an access network request response message to the ANDSF 10, and is further configured to select an access network from the access network list according to the type of the access network protocol supported by the UE, and initiate a handover to the selected access network.
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。  The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

权利要求书 Claim
1、 一种 ANDSF提供接入网协议选择功能的方法, 其特征在于, 该方 法包括:  A method for an ANDSF to provide an access network protocol selection function, the method comprising:
接入网发现和选择功能单元(ANDSF )依据用户设备 ( UE )发送的接 入网请求消息生成接入网列表;  An access network discovery and selection function unit (ANDSF) generates an access network list according to an access network request message sent by a user equipment (UE);
UE依据自身支持的接入网协议类型从所述接入网列表中选择接入网, 并发起向所述选择的接入网的切换。  The UE selects an access network from the list of access networks according to the type of access network protocol supported by the UE, and initiates handover to the selected access network.
2、 根据权利要求 1所述 ANDSF提供接入网协议选择功能的方法, 其 特征在于, 所述 UE发送接入网请求消息, 具体为:  2. The method for providing an access network protocol selection function by the ANDSF according to claim 1, wherein the UE sends an access network request message, specifically:
UE 通过当前接入网接入演进分组系统 (EPS ) 系统, 并检测到所述 ANDSF;  The UE accesses an evolved packet system (EPS) system through the current access network, and detects the ANDSF;
UE向所述 ANDSF发送接入网请求消息。  The UE sends an access network request message to the ANDSF.
3、根据权利要求 1或 2所述 ANDSF提供接入网协议选择功能的方法, 其特征在于,所述接入网请求消息至少包括 UE位置信息和 UE支持的接入 网协议类型。  The method for providing an access network protocol selection function by the ANDSF according to claim 1 or 2, wherein the access network request message includes at least UE location information and an access network protocol type supported by the UE.
4、根据权利要求 1或 2所述 ANDSF提供接入网协议选择功能的方法, 其特征在于, 所述接入网请求消息至少包括 UE位置信息。  The method for providing an access network protocol selection function by the ANDSF according to claim 1 or 2, wherein the access network request message includes at least UE location information.
5、 根据权利要求 3所述 ANDSF提供接入网协议选择功能的方法, 其 特征在于, 所述 ANDSF生成接入网列表, 具体为: 所述 ANDSF依据所述 UE位置信息和所述 UE支持的接入网协议类型生成所述接入网列表;  The method for providing an access network protocol selection function by the ANDSF according to claim 3, wherein the ANDSF generates an access network list, specifically: the ANDSF is based on the UE location information and supported by the UE Generating an access network list by using an access network protocol type;
所述接入网列表至少包括: 接入网、 所述接入网支持的接入网协议类 型和所述接入网的优先级;  The access network list at least includes: an access network, an access network protocol type supported by the access network, and a priority of the access network;
所述接入网列表中的接入网支持的接入网协议类型为所述 UE 支持的 接入网协议类型。  The access network protocol type supported by the access network in the access network list is an access network protocol type supported by the UE.
6、 根据权利要求 5所述 ANDSF提供接入网协议选择功能的方法, 其 特征在于, 所述 ANDSF生成接入网列表时, 该方法还包括: 所述 ANDSF 依据所述 UE位置信息设置所述接入网列表中接入网的优先级。 6. The method of claim 5, wherein the ANDSF provides an access network protocol selection function, The method further includes: when the ANDSF generates an access network list, the method further includes: the ANDSF setting a priority of the access network in the access network list according to the UE location information.
7、 根据权利要求 6所述 ANDSF提供接入网协议选择功能的方法, 其 特征在于, 所述 ANDSF生成接入网列表之后, 该方法还包括:  The method for providing an access network protocol selection function by the ANDSF according to claim 6, wherein after the ANDSF generates the access network list, the method further includes:
所述 ADNSF向所述 UE返回接入网请求响应消息;所述接入网请求响 应消息至少包括所述接入网列表;  Returning, by the ADNSF, an access network request response message to the UE; the access network request response message includes at least the access network list;
相应的, UE选择接入网, 具体为: 所述 UE从所述接入网列表中选取 所述优先级最高的接入网。  Correspondingly, the UE selects the access network, specifically: the UE selects the access network with the highest priority from the access network list.
8、 根据权利要求 4所述 ANDSF提供接入网协议选择功能的方法, 其 特征在于, 所述 ANDSF生成接入网列表, 具体为: 所述 ANDSF依据所述 UE位置信息生成所述接入网列表;  The method for providing an access network protocol selection function by the ANDSF according to claim 4, wherein the ANDSF generates an access network list, specifically: the ANDSF generates the access network according to the location information of the UE. List
所述接入网列表至少包括: UE当前位置可用的接入网、 和所述接入网 支持的接入网协议类型。  The access network list includes at least: an access network available for the current location of the UE, and an access network protocol type supported by the access network.
9、 根据权利要求 8所述 ANDSF提供接入网协议选择功能的方法, 其 特征在于, 所述 ANDSF生成接入网列表之后, 该方法还包括:  The method for providing an access network protocol selection function by the ANDSF according to claim 8, wherein after the ANDSF generates the access network list, the method further includes:
所述 ADNSF向所述 UE返回接入网请求响应消息;  Returning, by the ADNSF, an access network request response message to the UE;
所述接入网请求响应消息至少包括所述接入网列表和最新的系统移动 策略;  The access network request response message includes at least the access network list and a latest system mobility policy;
相应的, UE选择接入网, 具体为: 所述 UE从所述接入网列表中选取 与自身所支持的接入网协议类型匹配的接入网;所述 UE进一步依据所述最 新的系统移动策略从所述匹配的接入网中选择接入网。  Correspondingly, the UE selects an access network, specifically: the UE selects an access network that matches an access network protocol type supported by the UE from the access network list; the UE further relies on the latest system. The mobility policy selects an access network from the matched access networks.
10、 一种 ANDSF提供接入网协议选择功能的系统, 其特征在于, 该系 统包括: ANDSF和 UE, 其中,  A system in which an ANDSF provides an access network protocol selection function, the system includes: an ANDSF and a UE, where
所述 ANDSF, 用于依据所述 UE发送的接入网请求消息生成接入网列 表; 所述 UE, 用于向所述 ANDSF发送接入网请求响应消息; 还用于依据 自身支持的接入网协议类型从所述接入网列表中选择接入网, 并发起向所 述选择的接入网的切换。 The ANDSF is configured to generate an access network list according to the access network request message sent by the UE; The UE is configured to send an access network request response message to the ANDSF, and is further configured to select an access network from the access network list according to an access network protocol type supported by the UE, and initiate the selection to the Switching of the access network.
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