WO2005071981A1 - Methode interactive de determination par un terminal d'abonne d'informations de selection d'un reseau local sans fil - Google Patents

Methode interactive de determination par un terminal d'abonne d'informations de selection d'un reseau local sans fil Download PDF

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Publication number
WO2005071981A1
WO2005071981A1 PCT/CN2004/000902 CN2004000902W WO2005071981A1 WO 2005071981 A1 WO2005071981 A1 WO 2005071981A1 CN 2004000902 W CN2004000902 W CN 2004000902W WO 2005071981 A1 WO2005071981 A1 WO 2005071981A1
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WO
WIPO (PCT)
Prior art keywords
network
wlan
user terminal
access
current
Prior art date
Application number
PCT/CN2004/000902
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English (en)
French (fr)
Inventor
Wenlin Zhang
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to DE602004017746T priority Critical patent/DE602004017746D1/de
Priority to JP2006522200A priority patent/JP4309426B2/ja
Priority to EP04762038A priority patent/EP1653752B1/en
Priority to CA002533686A priority patent/CA2533686A1/en
Publication of WO2005071981A1 publication Critical patent/WO2005071981A1/zh
Priority to US11/348,922 priority patent/US20060187892A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0892—Network architectures or network communication protocols for network security for authentication of entities by using authentication-authorization-accounting [AAA] servers or protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to network access technology, and in particular, to an interactive method for a user terminal to determine network selection information in a wireless local area network (WLAN).
  • WLAN wireless local area network
  • Wireless local area network includes a variety of different technologies.
  • IEEE 802.11b which uses the 2.4GHz frequency band and has a maximum data transmission rate of 11Mbps.
  • IEEE 802.11g and Bluetooth are also used in this frequency band.
  • Technology, among them, the highest data transmission rate of 802.11g can reach 54Mbps.
  • Other new technologies such as IEEE 802.11a and ETSI BRAN Hiperlan2 both use the 5GHz frequency band and the highest transmission rate can reach 54Mbps.
  • WLANs are used to transmit Internet Protocol (IP) packet data packets.
  • IP Internet Protocol
  • the specific WLAN access technology it uses is generally transparent to the upper-layer IP.
  • Its basic structure uses an access point (AP) to complete the wireless access of user terminals, and forms an IP transmission network through network control and connection of device connections.
  • AP access point
  • WLAN and various wireless mobile communication networks such as: GSM, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, Time Division Duplex-Synchronous Code Division Multiple Access (TD-SCDMA) system and CDMA2000 system are becoming the focus of current research.
  • 3GPP 3rd Generation Partnership Project
  • user terminals can be connected to the Internet (Internet) and the corporate intranet (Intranet) through the WLAN access network, and can also be connected to the home network of the 3GPP system via the WLAN access network.
  • Internet Internet
  • Intranet corporate intranet
  • the access network connection of the 3GPP system specifically, when the WLAN user terminal is locally accessed, it is connected to the 3GPP home network via the WLAN access network, as shown in FIG.
  • FIG. 1 and FIG. 2 are schematic diagrams of the networking structure of interworking between the WLAN system and the 3GPP system under roaming and non-roaming situations.
  • the 3GPP system in the 3GPP system, it mainly includes a Home Subscriber Subscriber Server (HSS) / Home Location Register (HLR), a 3GPPAAA server, a 3GPPAAA proxy, a WAG, a packet data gateway, and a charging gateway (CGw) / Charging Information Collection System (CCF) and Online Charging System (OCS).
  • HSS Home Subscriber Subscriber Server
  • HLR Home Location Register
  • 3GPPAAA server 3GPPAAA proxy
  • WAG packet data gateway
  • CGw Charging Information Collection System
  • OCS Online Charging System
  • the user terminal, the WLAN access network, and all entities of the 3GPP system form a 3GPP-WLAN interactive network.
  • This 3GPP-WLAN interactive network can be used as a wireless LAN service system.
  • the 3GPP AAA server is responsible for user authentication, authorization, and charging, and collects and transmits the charging information sent by the WLAN access network to the charging system;
  • the packet data gateway is responsible for transferring user data from the WLAN access network to the 3GPP Data transmission of the network or other packet networks;
  • the billing system mainly receives and records user billing information transmitted from the network, and also includes OCS instructs the network to periodically transmit online fee information based on the fees of online billing users, and performs statistics and control.
  • a LAN user terminal wants to directly access the Internet / Intranet
  • the user terminal After the user terminal completes the access authentication and authorization through the WLAN access network and the AAA server (AS), the user terminal can access the LAN access network.
  • Internet / Intranet If the WLAN user terminal also wants to access the 3GPP packet switching (PS) domain service, it may further apply to the 3GPP home network for an interworking scenario 3 (Scenario3) service, that is, the WLAN user terminal requests 3GPP
  • the AS of the home network initiates a service authorization request for interworking scenario 3.
  • the AS of the 3GPP home network performs service authentication and authorization on the service authorization request.
  • the AS sends an access permission message to the J3 ⁇ 4 user terminal, and the AS sends to the user terminal.
  • the user can access the 3GPP PS domain services after a tunnel is established between the user and the allocated PDGs.
  • CGw / ⁇ CF and OCS record charging information according to the network usage of the user terminal.
  • the user terminal may apply to the 3GPP home network to access the Internet / Intranet through the 3 GPP access network.
  • the user terminal needs to initiate a service authorization process to the 3GPP home network through the 3GPP access network. This process is also between the user terminal and the AS of the 3GPP home network. After the authorization is successful, the AS allocates the corresponding home PDG to the user terminal. After the user terminal establishes a tunnel between the WAG in the network and the allocation PDG through the 3GPP, the user terminal can access the 3GPP PS domain service of the home network.
  • the 3GPP access network refers to access to a public land mobile network (VPLMN), After the WLAN user terminal accesses the WLAN, it is necessary to select the VPLMN network that it wants to access.
  • VPLMN public land mobile network
  • a WLAN access network is connected to two VPLMN operating networks of China Mobile and China Unicom at the same time. Then, users of China Unicom After accessing from WLAN, you need to instruct the WLAN access network to access China Unicom's VPLMN operating network.
  • the network selection information refers to information of a mobile communication operating network to which the user terminal is currently connected, and may be placed in a separately set field, or may be placed in a user identification field defined in a network access identification (NAI) format.
  • NAI network access identification
  • the user identification field includes two parts, a user name and a domain name.
  • the current user terminal is in a network environment in which multiple WLAN networks coexist, the above solution cannot guarantee that the user selects the optimal PLMN network in the network environment, for example: it is not possible to ensure that the user terminal selects its home.
  • the internet Taking the network environment shown in FIG. 5 as an example, the WLAN user terminal is in the coverage of WLAN1 and WLAN2 at the same time, where WLAN1 connects the three access networks VPLMN1, VPLMN2, and VPLMN3 of the current user terminal, and WLAN2 connects the home network HPLMN and Visit the network VPLMN3.
  • the optimal choice is generally the home network HPLMN of the user terminal.
  • the user terminal may access from WLAN1 first, and the WLAN1 network selected by the user terminal is directly connected to the roaming operator network. Then, the user terminal does not have the opportunity to select the WLAN2 network to connect directly. Of its own home network. How can the user terminal select the optimal mobile communication operation network access every time? No specific solution has been proposed at present. Summary of the invention
  • the main object of the present invention is to provide a method for determining user end in a wireless local area network.
  • the method for interacting with the selection information of the remote network enables a user terminal located in more than one WLAN coverage area to select an appropriate mobile communication operation network access as required.
  • An interactive method for a user terminal to determine network selection information in a wireless local area network includes the following steps:
  • the current WLAN user terminal which is in the coverage area of more than one WLAN, selects a WLAN access from all unselected WLANs detected by the user ruler, and sends its initial network selection information to the currently selected WLAN access network ;
  • step b Determine whether to successfully access the initial selection network of the current user terminal from the currently selected WLAN access network, and if successful, send the access authentication request of the current WLAN user terminal to its initial selection network, and end the current network selection process Otherwise, the currently selected WLAN access network sends the information of the mobile communication operating network to which it is connected to the current WLAN user terminal, and the user terminal stores the received network information, and then determines whether there is still a selected WLAN. , Then return to step a; if not, end the current network selection process.
  • the method further includes: c the current WLAN user terminal ⁇ out of all mobile communication operation information stored by itself ⁇ the mobile communication operation network to be accessed, and will select The mobile communication operation network information of the mobile communication service is sent to the WLAN access network corresponding to the mobile communication operation network as network selection information.
  • the method further includes: setting an initial network selection in the user terminal in advance.
  • Step a further includes:
  • the current WLAN user terminal selects a WLAN, it first establishes a wireless connection with the selected WLAN access network, and then the network or the WLAN user terminal initiates an access certificate process, and the WLAN access network sends a requesting user name to the current WLAN user terminal.
  • the current WLAN user terminal After the current WLAN user terminal receives the request username message, it returns a response message carrying the initial network selection information to the currently selected WLAN access network. Then, the judgment of successful access described in step b is: After the network receives a response message carrying the initial network selection information of the current WLAN user terminal, it is determined whether the initial network selection of the current WLAN terminal belongs to the current WLAN access network connection. If the mobile communication operation network belongs, the access is successful; otherwise, the access fails.
  • the initial network is selected as a home network of the current WLAN user terminal. After step c, it further includes:
  • the WLAN access network that receives the current network selection information of the WLAN user terminal, and sends the access authentication request of the WLAN user terminal to the multi-operation communication operation network identified by the network selection information.
  • the current WLAN user terminal in step c selects an optimal mobile communication operation network access according to a preset optimal access network determination condition.
  • the optimal access network determination condition is determined according to a service rate, a network bandwidth, a network speed, a network capability, and a condition of a service that can be provided to a user terminal.
  • the currently selected WLAN access network in step b sends all mobile communication operating network information directly connected to itself to the current WLAN user terminal. Or, in step b, the currently selected WLAN access network sends all mobile communication operating network information that is directly connected to itself and has a roaming relationship with the home network indicated by the current WLAN user terminal to the current WLAN user terminal.
  • an interactive method for determining user terminal network selection information is provided.
  • the user terminal uses preset initial network selection information for each detected one in turn.
  • the WLAN performs polling to determine whether the initial selected network can be accessed through a certain WLAN. If not, the mobile communication network can be selected for access. In this way, when the WLAN user terminal is in a multi-WLAN coverage area, the current user terminal can select a relatively optimal mobile communication operation network access every time, which provides better services for the user.
  • Figure 1 is a schematic diagram of the network structure for interworking between the WLAN system and the 3GPP system in the case of roaming
  • Figure 2 is a schematic diagram of the network structure for interworking between the WLAN system and the 3GPP system in the non-roaming situation
  • FIG. 3 is a schematic diagram of a network structure in which a WLAN is connected to multiple access networks
  • FIG. 4 is a schematic flowchart of interactive processing of network selection information of a user terminal according to the present invention
  • FIG. 5 is a schematic diagram of a network structure where a current user terminal is in multiple WLAN coverage areas
  • FIG. 6 is a schematic flowchart of an implementation of the present invention
  • FIG. 7 is a schematic flowchart of a first embodiment of determining a network selection information interaction process according to the present invention
  • FIG. 8 is a schematic flowchart of a second embodiment of determining a network selection information interaction process according to the present invention
  • the basic idea of the present invention is: For a user terminal located in more than one WLAN coverage area, the user terminal polls each detected WLAN in turn with the preset initial network selection information, and if the current WLAN access If the network is directly connected to the initial selection network of the current user terminal, it is determined that the initial selection network access of the current user terminal is selected; the current WLAN access network is not directly connected to the initial selection network of the current user terminal.
  • an optimal one is selected for access from all the visited networks or the information is presented to the user to select a network for access.
  • the network selection information refers to information of a mobile communication operating network connected to the WLAN network that the user terminal is currently accessing, and the network selection information may be placed in an access authentication request.
  • the uniquely set field may also be placed in a user identification field defined in a network access identification (NAI) format in the access authentication request.
  • NAI network access identification
  • An initial network selection of each user terminal is preset, and the initial network selection may be a home network of each user terminal.
  • the current user terminal detects the wireless access network and finds that more than one WLAN network exists.
  • the interactive processing for determining network selection information is performed. As shown in Figure 6, it includes the following steps:
  • Step 601 The current user terminal selects one of accesses from all detected unselected LANs.
  • the selection here can be any choice; it can also be selected according to certain conditions, and the signal strength can be compared.
  • the WLAN user terminal or network initiates the access authentication process. Taking the WLAN user terminal initiates the access authentication process as an example, the WLAN user terminal first sends an access authentication request to the currently selected WLAN access network.
  • the WLAN access network receives After the request, the access authentication process is started with the user terminal, and the current user terminal uses the initial network selection information as the network selection information.
  • the WLAN access network sends a user identification request message to the user terminal, requesting the user name of the current user terminal. After the WLAN user terminal receives the request, it sends to the WLAN access network the current user terminal's initial Response message for network selection information.
  • Steps 602 to 605 After the WLAN access network receives the response message, analyze the white user identification field in the response message; determine whether the network selection information carried in the user identification field is the mobile communication operating network connected to the WLAN If it is, that is, WLAN1 is directly connected to the initial selection network of the current user terminal, determine the mobile communication operation network that the current user terminal is to access as its initial selection network, and send the access authentication request of the current user terminal to Its home network performs access authentication processing and ends the current process; otherwise, that is, WLAN1 is not directly connected to the initial selected network of the current user terminal, the network delivers mobile communications connected to the currently selected WLAN access network to the current user terminal. Operating network information, current user terminal storage If there is delivered network information, step 606 is performed.
  • Steps 606 to 608 Determine whether there are WLANs that have not attempted to access, and if so, return to step 601.
  • the selection may be arbitrary or selected according to certain conditions; if not, the current user terminal selects One of the stored mobile communication operation networks is selected for access, and the selected mobile communication operation network information is used as network selection information to send to the WLAN access network corresponding to the selected mobile communication operation network to complete subsequent operations.
  • the current user terminal may select an optimal mobile communication operation network access according to a preset optimal access network determination condition.
  • the optimal access network determination condition is determined by factors such as the service charge rate, network bandwidth, network speed, network capability, and the service conditions required to be able to provide the user terminal for each mobile communication operation network.
  • the user terminal may also display the selectable network to the user, and the user selects and determines.
  • steps 607 and 608 may also be omitted, that is, if after polling all the detected WLANs, the initial selection network of the current user terminal is still not successfully accessed, the current process is ended, and no longer selected New mobile network access.
  • the mobile communication operation network information provided by the network to the user terminal for selection is stored in a dedicated network information storage unit, which generally includes the following parameters: network name, network bearer capability QOS, bandwidth, service capability, and WLAN interoperability that can be provided Scenario conditions, rate conditions, types of operators, etc.
  • a dedicated network information storage unit which generally includes the following parameters: network name, network bearer capability QOS, bandwidth, service capability, and WLAN interoperability that can be provided Scenario conditions, rate conditions, types of operators, etc.
  • WLAN1 in a 3GPP-WLAN interactive network, WLAN1 is directly connected to the home network of the current user terminal.
  • the current user terminal first polls WLAN1 and uses its own home network information.
  • the interactive process of determining network selection information includes the following steps: When the network is established, a connection is first established with the WLAN1 access network; then the WLAN1 access network sends a user identification request to the user terminal; the WLAN user After receiving the request, the terminal sends a response message carrying the home network information of the user terminal to the WLAN1 access network.
  • Steps 704 to 706 After receiving the response from the WLAN1 access network, it is found that the home network of the user terminal identified in the message is a mobile communication operating network connected to WLAN1, and then further determines the AAA of the home network to which the current user terminal is to access. A server; and then sending the user identity and access authentication request of the current user terminal to the 3GPP AAA server of the home network of the user terminal for access authentication processing.
  • Embodiment two After receiving the response from the WLAN1 access network, it is found that the home network of the user terminal identified in the message is a mobile communication operating network connected to WLAN1, and then further determines the AAA of the home network to which the current user terminal is to access. A server; and then sending the user identity and access authentication request of the current user terminal to the 3GPP AAA server of the home network of the user terminal for access authentication processing.
  • Embodiment two Embodiment two:
  • WLAN1 is not directly connected to the home network of the current user terminal
  • WLAN2 is directly connected to the home network of the current user terminal
  • the current user terminal first polls WLAN1, using its own home network information as the initial The network selection information was not successfully accessed.
  • WLAN2 was polled again, and its own home network information was also used as the initial network selection information, and it successfully accessed its own home network from WLAN2.
  • an interactive process of determining network selection information includes the following steps:
  • Steps 801 to 803 It is exactly the same as steps 701 to 703 in the first embodiment.
  • Steps 804 to 806 After receiving the response, the WLAN1 access network judges whether the home network of the user terminal identified in the message is a mobile communication operating network connected to WLAN1. If it is not found, the WLAN1 access network issues the current user terminal. The information of the mobile communication operation network connected to itself is stored after receiving by the current user terminal, and then the wireless connection with WLAN1 is disconnected.
  • Steps 807 to 809 The current user terminal establishes a wireless connection with the WLAN2 access network, and the WLAN2 access network sends a user identification request to the user terminal; after the WLAN user terminal receives the request, it sends The WLAN2 access network sends a response message carrying the home network information of the user terminal.
  • Steps 810 to 812 After receiving the response from the WLAN2 access network, it is found that the home network of the user terminal identified in the message is a mobile communication operating network connected to WLAN2, and then it is further determined that AAA server; then, send the user identity and access authentication request of the current user terminal to the 3GPP AAA server of the home network of the user terminal for access authentication processing.
  • Example three After receiving the response from the WLAN2 access network, it is found that the home network of the user terminal identified in the message is a mobile communication operating network connected to WLAN2, and then it is further determined that AAA server; then, send the user identity and access authentication request of the current user terminal to the 3GPP AAA server of the home network of the user terminal for access authentication processing.
  • Example three After receiving the response from the WLAN2 access network, it is found that the home network of the user terminal identified in the message is a mobile communication operating network connected to WLAN2, and then it is further determined that AAA server; then, send the user identity and access authentication request of the current user terminal to the 3GPP AAA server of the home network of the
  • neither WLAN1 nor WLAN2 is directly connected to the home network of the current user terminal.
  • the current user terminal first polls WLAN1 and uses its own home network information as the initial network selection information. ; Then turn to WLAN2, and also use its own home network information as the initial network selection information, which has not yet been successfully accessed; finally, select an optimal access from all mobile communication operating networks connected to WLAN1 and WLAN2 .
  • the process of determining the interaction of network selection information includes the following steps:
  • Step 901 Establish a wireless connection with the WLAN1 access network, and send a response packet carrying the home network information of the user terminal to the WLAN1 access network. After receiving the response packet, the WLAN1 access network determines that the home network of the user terminal is found If it is not connected to the WLAN1 access network, the mobile communication operation network information of the WLAN1 access network is sent to the user terminal, the current user terminal stores the information after receiving it, and then the WLAN1 access network disconnects the wireless connection with the current user terminal.
  • Step 902 Establish a wireless connection with the WLAN2 access network, and send a response message carrying the home network information of the user terminal to the WLAN2 access network. After receiving the response message, the WLAN2 access network determines that the home network of the user terminal is found If it is not connected to the WLAN2 access network, the mobile communication operating network information of the WLAN2 access network is sent to the user terminal, and the current user terminal stores the information after receiving it, and then the WLAN2 access network disconnects the wireless connection with the current user terminal.
  • Step 903 904 All mobile communication network information stored by the current user terminal from itself And select a mobile communication operation network connected to the WLAN2 access network, and then initiate the access authentication process to WLAN2 by using the initial authentication message EAPOL-Start.
  • Steps 905 to 906 After receiving the EAPOL-Start message, the WLAN2 access network sends an EAP-Request [Identity] signaling to the LAN user terminal to request the user identity again.
  • the WLAN user terminal passes the EAP-Response [Identity ] The message returns the user identification carrying the new network selection information to the WLAN2 access network.
  • Steps 907 to 908 After receiving the new user identity, the WLAN2 access network determines the mobile communication operation network selected by the WLAN user terminal according to the new network selection information therein, and sends the access authentication request information of the WLAN user terminal. Perform access authentication processing to the AAA proxy and AS of the network identified by the network selection information.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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Description

无线局域网中用户终端确定网络选择信息的交互方法 技术领域
本发明涉及网絡接入技术， 特别是指一种无线局域网 （WLAN ) 中用 户终端确定网絡选择信息的交互方法。 发明背景
由于用户对无线接入速率的要求越来越高， 无线局域网 （WLAN, Wireless Local Area Network )应运而生， 它能在较小范围内提供高速的无 线数据接入。 无线局域网包括多种不同技术， 目前症用较为广泛的一个技 术标准是 IEEE 802.11b, 它采用 2.4GHz 频段， 最高数据传输速率可达 11Mbps,使用该频段的还有 IEEE 802.11g和蓝牙（Bluetooth )技术，其中， 802.11g最高数据传输速率可达 54Mbps。 其它新技术诸如 IEEE 802.11a和 ETSI BRAN Hiperlan2都使用 5GHz频段，最高传输速率也可达到 54Mbps。
尽管有多种不同的无线接入技术， 大部分 WLAN都用来传输因特网 协议（IP )分组数据包。 对于一个无线 IP网络， 其采用的具体 WLAN接 入技术对于上层的 IP—般是透明的。 其基本的结构都是利用接入点（AP ) 完成用户终端的无线接入， 通过网络控制和连接设备连接组成 IP传输网 络。
随着 WLAN技术的兴起和发展， WLAN与各种无线移动通信网， 诸 如： GSM、 码分多址 （CDMA ) 系统、 宽带码分多址（WCDMA ) 系统、 时分双工-同步码分多址 ( TD-SCDMA ) 系统、 CDMA2000 系统的互通正 成为当前研究的重点。 在第三代合作伙伴计划（3GPP )标准化组织中， 用 户终端可以通过 WLAN的接入网络与因特网 （ Internet )、 企业内部互联网 ( Intranet )相连，还可以经由 WLAN接入网络与 3GPP系统的归属网络或 3GPP系统的访问网络连接， 具体地说就是， WLAN用户终端在本地接入 时， 经由 WLAN接入网络与 3GPP的归属网络相连， 如图 2所示； 在漫游 时， 经由 WLAN接入网络与 3GPP的访问网络相连， 3GPP访问网络中的 部分实体分别与 3GPP归属网络中的相应实体互连， 比如： 3GPP访问网络 中的 3GPP认证授权计费 （AAA )代理和 3GPP归属网络中的 3GPP认证 授权计费（ AAA )服务器； 3GPP访问网络中的无线局域网接入关口（ WAG ) 与 3GPP归属网络中的分组数据关口 （ PDG, Packet Data Gateway )等等， 如图 1所示。 其中， 图 1、 图 2分别为漫游' I青况下和非漫游情况下 WLAN 系统与 3GPP系统互通的组网结构示意图。
参见图 1、 图 2所示， 在 3GPP系统中， 主要包括归属签约用户服务 器（HSS ) /归属位置寄存器（HLR )、 3GPPAAA服务器、 3GPPAAA代理、 WAG、 分组数据关口、 计费关口 （CGw ) /计费信息收集系统 （CCF ) 及 在线计费系统（OCS )。 用户终端、 WLAN接入网络与 3GPP 系统的所有 实体共同构成了 3GPP-WLAN交互网络，此 3GPP-WLAN交互网络可作为 一种无线局域网服务系统。 其中， 3GPP AAA服务器负责对用户的鉴权、 授权和计费， 对 WLAN接入网络送来的计费信息收集并传送给计费系统； 分组数据关口负责将用户数据从 WLAN接入网络到 3GPP网络或其他分组 网络的数据传输； 计费系统主要接收和记录网络传来的用户计费信息， 还 包括 OCS 根据在线计费用户的费用情况指示网络周期性的传送在线费用 信息， 并进行统计和控制。
在非漫游情况下， 当 LAN 用户终端希望直接接入 Internet/Intranet 时， 用户终端通过 WLAN接入网与 AAA服务器（AS )完成接入认证授权 后， 用户终端可通过 LAN接入网接入到 Internet/Intranet。 如果 WLAN 用户终端还希望接入 3GPP分組交换（PS ) 域业务， 则可进一步向 3GPP 归属网络申请互通场景 3( Scenario3 )的业务，即： WLAN用户终端向 3GPP 归属网络的 AS发起互通场景 3的业务授权请求， 3GPP归属网络的 AS对 该业务授权请求进行业务鉴权和授权， 如果成功， 则 AS给 J¾户终端发送 接入允许消息， 且 AS给用户终端分配相应的 PDG, 用户终 与所分配的 PDG之间建立隧道后，即可接入 3GPP PS域业务。同时， CGw/^CF和 OCS 根据用户终端的网络使用情况记录计费信息。 在漫游情况下， 当 WLAN 用户终端希望直接接入 Internet/Intranet时， 用户终端可通过 3 GPP访问网 络向 3GPP归属网络申请接入到 Internet/Intranet。 如果用户 端还希望申 请互通场景 3业务， 接入到 3GPP PS域业务， 则用户终端需要通过 3GPP 访问网络向 3GPP归属网絡发起业务授权过程， 该过程同样在用户终端和 3GPP归属网络的 AS之间进行， 当授权成功后， AS给用户 端分配相应 的归属 PDG,用户终端通过 3GPP访问网络中的 WAG与分配 々 PDG之间 建立隧道后， 用户终端即可接入归属网络的 3GPP PS域业务。
如图 3所示， 在 3GPP-WLAN互通网络中， 如果一个 同时与 多个 3GPP访问网络， 即与多个移动通信运营网相连， 这里 3 GPP访问网 络就是指访问公众陆地移动网络（VPLMN ), 则 WLAN用户终端接入该 WLAN后， 就需要选择希望接入的 VPLMN 网络， 比如： 在中国， 一个 WLAN接入网同时与中国移动、 中国联通两个 VPLMN运营网络连接， 那 么， 中国联通的用户从 WLAN接入后， 就需要指示 WLAN接入网接入中 国联通的 VPLMN运营网络。再比如，某法国用户漫游到中国的某个 WLAN 中，如果该法国用户的归属网络同时与中国移动、 中国联通都有漫游协议， 则在 WLAN接入网与中国移动、 中国联通都相连的情况下， 该法国用户 在接入 WLAN后， 就需要选择接入的 VPLMN网络。
在另一专利申请中曾提出一种网络选择的解决方案， 参 JL图 4中步骤 401〜步骤 408所示： WLAN用户终端通过 WLAN接入 3GPP-WLAN互通 网络时， 该专利申请中， WLAN用户终端与 WLAN接入网定立无线连接 后初次接入时， 该用户终端与网络之间进行通过接入认证， 并且， 网络向 当前用户终端请求用户标识； 然后用户终端将向 WLAN接入网发送携带 有网络选择信息的响应报文； 发送给 WLAN接入网， WLAN接入网根据 所携带的网络选择信息判断是否属于自身所连接的移动通信运营网， 如果 是，则将当前用户终端连至所选的网络中进行接入认证及后续操作；否贝1 J , 即所指示的网络未与 WLAN接入网直接相连， 则网络会向当前用户终端 下发通知信令， 用户终端根据通知信令的内容完成后续操作。 其中， 网絡 选择信息是指用户终端当前所要接入的移动通信运营网信息， 可以放置于 单独设置的字段内， 也可以放置于以网络接入标识（NAI )格式定义的用 户标识字段内， 该用户标识字段包括用户名和域名两部分。
但是， 如果当前用户终端处在多个 WLAN 网络同时存在的网络环境 下， 则上述方案无法保障该用户在该网络环境下选择到最优的 PLMN 网 络， 比如： 无法确保该用户终端选到其归属网络。 以图 5所示网络环境为 例， WLAN用户终端同时处于 WLAN1和 WLAN2的覆盖范围内， 其中 WLAN1 连接当前用户终端的三个访问网络 VPLMN1、 VPLMN2 和 VPLMN3 , WLAN2 连接当前用户终端的归属网络 HPLMN和访问网絡 VPLMN3 , 在这种情况下， 对于当前用户终端来说， 一般其最优的选择是 该用户终端的归属网络 HPLMN。 但按现有技术的网络选择方案， 该用户 终端可能先从 WLAN1接入， 而用户终端选定的 WLAN1网络直接连接的 都是漫游运营商网络， 那么， 用户终端就没有机会选择 WLAN2网络直接 连接的自身的归属网络。 如何才能使用户终端每次都选择到最优的移动通 信运营网接入， 目前尚未有人提出具体的解决方案。 发明内容
有鉴于此， 本发明的主要目的在于提供一种无线局域网中确定用户终 端网络选择信息的交互方法， 使处于一个以上 WLAN覆盖区域的用户终 端能够根据需要选择适当的移动通信运营网接入。
为达到上述目的， 本发明的技术方案是这样实现的：
一种无线局域网（ WLAN )中用户终端确定网絡选择信息的交互方法， 该方法包括以下步骤：
a. 处于一个以上 WLAN覆盖范围的当前 WLAN用户终端人尺自身检测 到的所有未选择过的 WLAN中选择一个 WLAN接入， 并将自身的初始网 络选择信息发送给当前选定的 WLAN接入网；
b. 判断是否从当前选定的 WLAN接入网成功接入当前用户终端的初 始选择网络， 如果成功， 则将当前 WLAN用户终端的接入认证请求发送 至其初始选择网络， 结束当前网络选择流程； 否则， 当前选定的 WLAN 接入网将自身连接的移动通信运营网信息发送给当前 WLAN用户终端， 该用户终端存储所收到的网络信息， 然后判断是否还存在 选择过的 WLAN, 如果有， 则返回步骤 a; 如果没有， 则结束当前网络 择流程。
上述方案中，如果当前不存在未选择过的 WLAN,该方法进一步包括: c 当前 WLAN用户终端从自身存储的所有移动通信运营冈信息中^ 出所要接入的移动通信运营网， 并将选定的移动通信运营网信息、作为网络 选择信息发送给该移动通信运营网对应的 WLAN接入网。
该方法进一步包括： 预先在用户终端中设置初始网络选择。
步骤 a进一步包括：
al . 当前 WLAN用户终端选择一个 WLAN后 ,先与该选定 WLAN接 入网建立无线连接， 然后由网络或 WLAN用户终端发起接入 证过程， WLAN接入网向当前 WLAN用户终端发送请求用户名报文；
ο2. 当前 WLAN用户终端收到请求用户名报文后 ,向当前选定 WLAN 接入网返回携带有初始网络选择信息的响应报文。 则步骤 b 中所述判断是否成功接入为： 网络收到携带有当前 WLAN 用户终端初始网络选择信息的响应报文后， 判断当前 WLAN用 终端的 初始网络选择是否属于当前 WLAN接入网连接的移动通信运营网， 如果 属于， 则接入成功； 否则， 接入失败。
上述方案中， 所述初始网络选择为当前 WLAN用户终端的归属网络。 步骤 c之后进一步包括：
d. 收到当前 WLAN用户终端网络选择信息的 WLAN接入网， 将该 WLAN用户终端的接入认证请求发送至网络选择信息所标识的 多动通信 运营网。
步驟 c中所述当前 WLAN用户终端根据预先设定的最优访问网络判定 条件选择最优的移动通信运营网接入。 所述最优访问网络判定条件根据服 务费率、 网络带宽、 网络速度、 网络能力、 能够提供给用户终端所需服务 情况来决定。
步骤 b中当前选定 WLAN接入网将所有与自身直接相连的移动通信 运营网信息发送给当前 WLAN用户终端。或者，步驟 b中当前选定 WLAN 接入网将所有与自身直接相连的、 且与当前 WLAN用户终端所 旨示的归 属网络有漫游关系的移动通信运营网信息发送给当前 WLAN用户终端。
本发明所提供的无线局域网中确定用户终端网络选择信息的交互方 法， 对于处在一个以上 WLAN覆盖区域的用户终端， 该用户终端以预先 设定的初始网络选择信息， 依次对每个检测到的 WLAN进行轮询, 确定 是否能通过某个 WLAN接入初始选择网络， 如果不能， 则可以任选一个 移动通信运营网接入。 如此， 解决了 WLAN用户终端处于多 WLAN覆盖 范围时， 当前用户终端每次都能选择到相对最优的移动通信运营网接入， 为用户提供了更好的服务。 附图简要说明
图 1为漫游情况下 WLAN系统与 3GPP系统互通的网絡结构示意图； 图 2为非漫游情况下 WLAN系统与 3GPP系统互通的网络结构示意 图；
图 3为 WLAN与多个访问网络连接的网络结构示意图；
图 4为本发明用户终端网络选择信息的交互处理流程示意图； 图 5为当前用户终端处于多个 WLAN覆盖范围的网络结构示意图； 图 6为本发明实现的流程示意图；
图 7为本发明确定网络选择信息交互处理第一实施例的流程示意图； 图 8为本发明确定网络选择信息交互处理第二实施例的流程示意图； 图 9为本发明确定网络选择信息交互处理第三实施例的流程示意图。 实施本发明的方式
本发明的基本思想是： 对于处在一个以上 WLAN覆盖区域的用户终 端， 该用户终端以预先设定的初始网络选择信息， 依次对每个检测到的 WLAN进行轮询， 如果当前的 WLAN接入网与当前用户终端的初始选择 网络直接相连， 则确定选择当前用户终端的初始选择网络接入； 口果当前 的 WLAN接入网未与当前用户终端的初始选择网络直接相连， 贝'】轮询下 一个 WLAN并判断， 依此类推， 直到找到与当前用户终端的初始选择网 络直接相连的 WLAN接入网； 如果所有 WLAN全部轮询完毕， 没有直接 与当前用户终端的初始选择网络相连的 WLAN接入网， 则根据网络下发 的移动通信运营网信息和用户设置的优先条件从所有的访问网络中选定 一个最优的进行接入或把信息呈现给用户判断选择一个网絡进行接入。
这里， 网络选择信息是指用户终端当前所要接入的与 WLAN 网络相 连的移动通信运营网信息， 该网络选择信息可以放置于接入认证请求中单 独设置的字段内， 也可以放置于接入认证请求中以网络接入标识（NAI ) 格式定义的用户标识字段内。 每个用户终端的初始网络选择是预先设定 的， 该初始网络选择可以是每个用户终端各自的归属网络。
基于图 5 所示的网络结构， WLAN 用户终端通过 WLAN 接入 3GPP-WLAN互通网络时， 当前用户终端检测无线接入网络， 发现有一个 以上 WLAN 网络存在， 本发明中确定网络选择信息的交互处理， 如图 6 所示， 包括以下步骤：
步骤 601 : 当前用户终端从所有检测到的未选择过的 LAN中选择其 一接入。 这里的选择可以是任意选择； 也可以是根据某种条件选择， 比 口 信号强度。
由 WLAN用户终端或网络发起接入认证过程， 以 WLAN用户终端发 起接入认证过程为例 , WLAN用户终端先向当前选定的 WLAN接入网发 送接入认证请求； 该 WLAN接入网收到请求后， 与用户终端之间开始接 入认证过程， 当前用户终端将初始网络选择信息作为网络选择信息。 具体 地说就是： 该 WLAN接入网向用户终端发送请求用户标识报文， 请求当 前用户终端的用户名； WLAN用户终端收到该请求后， 向该 WLAN接入 网发送包含有当前用户终端初始网絡选择信息的响应报文。
步骤 602〜605： 该 WLAN接入网收到响应报文后， 对该响应报文中白 用户标识字段进行分析； 判断用户标识字段中携带的网络选择信息是否为 本 WLAN连接的移动通信运营网絡， 如果是， 也就是说 WLAN1直接与 当前用户终端的初始选择网络相连， 则确定当前用户终端要接入的移动通 信运营网络为其初始选择网络， 并将当前用户终端的接入认证请求送到其 归属网络进行接入认证处理， 结束当前流程； 否则， 也就是 WLAN1未直 接与当前用户终端的初始选择网络相连， 则网络向当前用户终端下发当前 选定 WLAN接入网所连接的移动通信运营网信息， 当前用户终端存储所 有下发的网络信息， 然后执行步骤 606。
步骤 606~608： 判断是否还有 WLAN未尝试接入， 如果有， 则返回步 驟 601 , 同样， 该选择可以是任意选择， 也可以是根据某种条件选择； 如 果没有， 则当前用户终端从所有存储的移动通信运营网中选择一个进行接 入， 并将所选的移动通信运营网信息作为网络选择信息， 发送给所选移动 通信运营网对应的 WLAN接入网， 完成后续操作。 这里， 当前用户终端 可以根据预先设定的最优访问网络判定条件选择最优的移动通信运营网 接入。 该最优访问网络判定条件由每个移动通信运营网的服务费率、 网络 带宽、 网络速度、 网络能力、 能够提供给用户终端所需服务情况等等因素 来决定的。 当然， 用户终端也可以将可选择网络显示给用户， 由用户来选 择确定。
上述方案中， 也可以省略步骤 607和 608, 也就是说， 如果轮询完所 有检测到的 WLAN后， 仍未能成功接入到当前用户终端的初始选择网络， 则结束当前流程， 不再选择新的移动网络接入。
在上述方案中， 网络提供给用户终端进行选择的移动通信运营网信息 存储在专门的网络信息存储单元， 一般包括以下参数： 网络名称、 网络承 载能力 QOS、 带宽、 业务能力、 能够提供的 WLAN互通场景情况、 费率 情况、 业务者种类等等。 网络下发当前 WLAN连接的移动通信运营网信 息时， 可将当前 LAN接入网连接的所有移动通信运营网信息全部下发 给当前用户终端， 也可选择与当前用户终端所指示的归属网络有漫游关系 的访问网絡信息下发， 如果没有则可以不下发， 或通知用户没有漫游关系 存在。
实施例一：
本实施例为 3GPP-WLAN交互网络中， WLAN1直接与当前用户终端 的归属网络相连， 当前用户终端先轮询 WLAN1 , 以自身的归属网络信息 作为初始网络选择信息， 并成功从 WLAN1接入自身的归属网絡。 如图 7 所示， 本实施例中确定网络选择信息的交互处理过程包括以下的步驟： 网络时， 先与 WLAN1接入网建立连接； 然后 WLAN1接入网向用户终端 发送用户标识请求； WLAN用户终端收到该请求后， 向 WLAN1接入网发 送携带有该用户终端归属网信息的响应报文。
步骤 704〜706： WLAN1 接入网收到响应后， 发现报文中所标识的用 户终端的归属网是 WLAN1连接的移动通信运营网络， 则进一步确定当前 用户终端要接入的其归属网的 AAA服务器； 然后， 将当前用户终端的用 户标识和接入认证请求送至该用户终端归属网络的 3GPP AAA服务器进行 接入认证处理。 实施例二：
本实施例为 3GPP-WLAN交互网络中， WLAN1未与当前用户终端的 归属网络直接相连， WLAN2 直接与当前用户终端的归属网络相连， 当前 用户终端先轮询 WLAN1 , 以自身的归属网络信息作为初始网络选择信息， 但未成功接入； 接着又轮询 WLAN2, 同样以自身的归属网络信息作为初 始网络选择信息， 并成功从 WLAN2接入自身的归属网络。 如图 8所示， 本实施例中确定网络选择信息的交互处理过程包括以下的步骤：
步驟 801〜803： 与实施例一中的步骤 701〜703完全相同。
步骤 804〜806： WLAN1 接入网收到响应后， 判断报文中所标识的用 户终端的归属网是否为 WLAN1连接的移动通信运营网络， 发现不是， 则 WLAN1 接入网向当前用户终端下发自身连接的移动通信运营网信息， 当 前用户终端收到后存储， 然后断开与 WLAN1的无线连接。
步驟 807〜809：当前用户终端与 WLAN2接入网建立无线连接， WLAN2 接入网向用户终端发送用户标识请求； WLAN用户终端收到该请求后， 向 WLAN2接入网发送携带有该用户终端归属网信息的响应报文。
步骤 810〜812： WLAN2接入网收到响应后， 发现报文中所标识的用 户终端的归属网是 WLAN2连接的移动通信运营网， 则进一步确定当前月 户终端要接入的其归属网的 AAA服务器； 然后， 将当前用户终端的用户 标识和接入认证请求送至该用户终端归属网絡的 3GPP AAA服务器进行接 入认证处理。 实施例三：
本实施例为 3GPP-WLAN交互网络中， WLAN1和 WLAN2均未与当 前用户终端的归属网络直接相连， 当前用户终端先轮询 WLAN1 , 以自身 的归属网络信息作为初始网络选择信息， 未成功接入； 接着又轮词 WLAN2, 同样以自身的归属网络信息作为初始网络选择信息， 仍未成功 接入； 最后， 从 WLAN1和 WLAN2所连接的所有移动通信运营网中选定 一个最优的进行接入。 如图 9所示， 本实施例中确定网络选择信息的交互 处理过程包括以下的步骤：
步骤 901 : 与 WLAN1接入网建立无线连接， 向 WLAN1接入网发送 携带有该用户终端归属网信息的响应报文， WLAN1 接入网收到响应报文 后， 经判断发现用户终端的归属网并未与 WLAN1接入网相连， 则向用户 终端发送自身连接的移动通信运营网信息， 当前用户终端收到后存储， 然 后 WLAN1接入网断开与当前用户终端之间的无线连接。
步骤 902: 与 WLAN2接入网建立无线连接， 向 WLAN2接入网发送 携带有该用户终端归属网信息的响应报文， WLAN2接入网收到响应报文 后， 经判断发现用户终端的归属网并未与 WLAN2接入网相连, 则向用户 终端发送自身连接的移动通信运营网信息， 当前用户终端收到后存储， 然 后 WLAN2接入网断开与当前用户终端之间的无线连接。
步骤 903 904: 当前用户终端从自身存储的所有移动通信运营网信息 中选择一个与 WLAN2接入网连接的移动通信运营网， 然后通过初始认证 · 报文 EAPOL-Start再次向 WLAN2主动发起接入认证过程。
步骤 905〜906： WLAN2接入网收到 EAPOL-Start报文后，向该 LAN 用户终端再次下发 EAP-Request[Identity]信令， 重新请求用户标识； 该 WLAN用户终端通过 EAP-Response[Identity]报文向 WLAN2接入网返回携 带有新网络选择信息的用户标识。
步驟 907~908： WLAN2接入网收到新的用户标识后， 根据其中的新 网络选择信息确定该 WLAN用户终端所选择的移动通信运营网， 并将该 WLAN 用户终端的接入认证请求信息送到网络选择信息所标识的网络的 AAA Proxy及 AS中进行接入认证处理。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限制本发明的保 护范围。

Claims

权利要求书
1、 一种无线局域网 （WLAN ) 中用户终端确定网络选择信息的交互 方法， 其特征在于， 该方法包括以下步骤： ·
a. 处于一个以上 WLAN覆盖范围的当前 WLAN用户终端从自身检测 到的所有未选择过的 WLAN中选择一个 WLAN接入， 并将自身的初始网 络选择信息发送给当前选定的 WLAN接入网；
b. 判断是否从当前选定的 WLAN接入网成功接入当前用户终端的初 始选择网络， 如果成功， 则将当前 WLA 用户终端的接入认证请求发送 至其初始选择网络， 结束当前网络选择流程； 否则， 当前选定的 WLAN 接入网将自身连接的移动通信运营网信息发送给当前 WLAN用户终端， 该用户终端存储所收到的网络信息， 然后判断是否还存在未选择过的 WLAN, 如果有， 则返回步骤 a; 如果没有， 则结束当前网络选择流程。
2、 根据权利要求 1 所述的方法， 其特征在于， 如果当前不存在未选 择过的 WLAN, 该方法进一步包括：
c 当前 WLAN用户终端从自身存储的所有移动通信运营网信息中选 出所要接入的移动通信运营网， 并将选定的移动通信运营网信息作为网络 选择信息发送给该移动通信运营网对应的 WLAN接入网。
3、 根据权利要求 1 所述的方法， 其特征在于， 该方法进一步包括： 预先在用户终端中设置初始网络选择。
4、 根据权利要求 1所述的方法， 其特征在于， 步骤 a进一步包括： al. 当前 WLAN用户终端选择一个 LAN后， 先与该选定 WLAN接 入网建立无线连接， 然后由网络或 WLAN用户终端发起接入认证过程， WLAN接入网向当前 WLAN用户终端发送请求用户名报文；
a2. 当前 WLAN用户终端收到请求用户名报文后，向当前选定 WLAN 接入网返回携带有初始网络选择信息的响应报文。
5、 根据权利要求 4所述的方法， 其特征在于， 步骤 b中所述判断是 否成功接入为： 网絡收到携带有当前 WLAN用户终端初始网絡选择信息 的响应报文后， 判断当前 WLAN用户终端的初始网络选择是否属于当前 WLAN接入网连接的移动通信运营网， 如果属于， 则接入成功； 否则， 接 入失败。
6、 根据权利要求 1、 3、 4或 5所述的方法， 其特征在于， 所述初始 网络选择为当前 WLAN用户终端的归属网络。
7、根据权利要求 2所述的方法，其特征在于，步骤 c之后进一步包括： d. 收到当前 WLAN用户终端网络选择信息的 WLAN接入网， 将该
WLAN 用户终端的接入认证请求发送至网络选择信息所标识的移动通信 运营网。
8、根据权利要求 2所述的方法，其特征在于，步驟 c中所述当前 WLAN 用户终端根据预先设定的最优访问网络判定条件选择最优的移动通信运 营网接入。
9、 根据权利要求 8 所述的方法， 其特征在于， 所述最优访问网络判 定条件根据服务费率、 网络带宽、 网络速度、 网络能力、 能够提供给用户 终端所需服务情况来决定。
10、 根据权利要求 1 所述的方法， 其特征在于， 步骤 b 中当前选定 WLAN接入网将所有与自身直接相连的移动通信运营网信息发送给当前 WLAN用户终端。
11、 根据权利要求 1 所述的方法， 其特征在于， 步骤 b 中当前选定 WLAN接入网将所有与自身直接相连的、 且与当前 WLAN用户终端所指 示的归属网络有漫游关系的移动通信运营网信息发送给当前 WLAN 用户 终端。
PCT/CN2004/000902 2003-08-07 2004-08-05 Methode interactive de determination par un terminal d'abonne d'informations de selection d'un reseau local sans fil WO2005071981A1 (fr)

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