WO2005011305A1 - Procédé interactif pouvant optimiser le choix d'un terminal utilisateur d'accéder à un réseau mobile dans un wlan - Google Patents

Procédé interactif pouvant optimiser le choix d'un terminal utilisateur d'accéder à un réseau mobile dans un wlan Download PDF

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Publication number
WO2005011305A1
WO2005011305A1 PCT/CN2004/000854 CN2004000854W WO2005011305A1 WO 2005011305 A1 WO2005011305 A1 WO 2005011305A1 CN 2004000854 W CN2004000854 W CN 2004000854W WO 2005011305 A1 WO2005011305 A1 WO 2005011305A1
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WIPO (PCT)
Prior art keywords
network
user terminal
wlan
selection information
information
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PCT/CN2004/000854
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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.)
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34085337&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2005011305(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to US10/566,436 priority Critical patent/US7706793B2/en
Priority to CA002534110A priority patent/CA2534110A1/en
Priority to EP20040762001 priority patent/EP1662813B2/en
Priority to JP2006521374A priority patent/JP4954704B2/ja
Priority to DE200460011372 priority patent/DE602004011372D1/de
Publication of WO2005011305A1 publication Critical patent/WO2005011305A1/zh

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Classifications

    • 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
    • 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
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0281—Proxies
    • 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 particularly to an optimized interactive processing method for a user terminal in a wireless local area network (WLAN) to select an optimal access to a mobile communication operation network.
  • 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 technology are also used in this frequency band. 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
  • 3GPP 3rd Generation Partnership Project
  • user terminals can communicate with the Internet (Internet) and enterprises through an WLAN access network. It is connected to the Internet, and can also be connected to the home network of the 3GPP system or the access network of the 3GPP system through the WLAN access network. Specifically, when the WLAN user terminal accesses locally, the home network is connected to the 3GPP home via the WLAN access network.
  • the network is connected, as shown in Figure 2.
  • When roaming it is connected to the 3GPP access network via the WLAN access network, and some entities in the 3GPP access network are interconnected with corresponding entities in the 3GPP home network, for example: 3GPP access network 3GPP Authentication, Authorization and Accounting (AAA) proxy and 3GPP Authentication, Authorization and Accounting (AAA) server in the 3GPP home network; Wireless Local Area Network Access Gateway (WAG) in the 3GPP access network and Packet Data Gateway (PDG) in the 3GPP home network , Packet Data Gateway, etc., as shown in Figure 1.
  • FIG. 1 and FIG. 2 are schematic diagrams of the networking structure of interworking between the WLAN system and the 3GPP system in a roaming situation and a non-roaming situation, respectively.
  • the 3GPP system in the 3GPP system, it mainly includes a Home Subscriber Subscriber Server (HSS) / Home Location Register (HLR), a 3GPP AAA server, a 3GPP AAA 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
  • 3GPP AAA server 3GPP AAA 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 local area network 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 from the network, and also includes the OCS instructs the network to periodically transmit online billing information according to the billing situation of online billing users, and performs statistics and control.
  • a WLAN 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 WLAN access network.
  • Internet / Intranet If the WLAN user terminal also wants to access 3GPP packet switched (PS) domain services,
  • PS packet switched
  • the home network applies for an interworking scenario 3 (Scenario3) service, that is, a WLAN user terminal initiates a service authorization request for the interworking scenario 3 to the AS of the 3GPP home network, and the AS of the 3GPP home network performs service authentication and authorization on the service authorization request. If successful, the AS sends an access permission message to the user terminal, and the AS assigns the corresponding PDG to the user terminal.
  • scenario3 interworking scenario 3
  • the AS After establishing a tunnel between the user terminal and the allocated PDG, the AS can access 3GPP PS domain services. At the same time, CGw / CCF and OCS record charging information based on the network usage of the user terminal.
  • the user terminal may apply to the 3GPP home network to access the Internet / Intranet through the 3GPP access network. If the user terminal also wishes to apply for the interworking scenario 3 service and access the 3GPP PS domain service, 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.
  • the AS allocates the corresponding home PDG to the user terminal.
  • the user terminal After the user terminal establishes a tunnel between the WAG in the network and the allocated 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.
  • a French user roams to a WLAN in China. If the French user's home network has roaming agreements with China Mobile and China Unicom, then the WLAN access network is connected to China Mobile and China Unicom. In this case, after the French user accesses the WLAN, the user needs to select the VPLMN network to be accessed. Then, how should the user terminal select the network to be accessed, and notify the WLAN access network of the network information it has selected, and How the 3GPP-WLAN interworking network uses the network selection information of the user terminal for interactive processing, a solution has been proposed in another patent application.
  • a WLAN user terminal sends network selection information to a WLAN access network through an access authentication request, and the WLAN access network can identify the mobile communication that the user terminal wants to access according to the carried network selection information. Operate the network and connect the current user terminal to the selected network for access authentication and subsequent operations.
  • a WLAN user terminal makes a network selection every time, it will consume a lot of network. For example, if a user roams to a foreign country, his home mobile communication operating network is not directly connected to his current WLAN access network. If a user terminal always carries his home network as the initial network selection to the WLAN access network, then Each access triggers the network selection process. The WLAN network sends network selection information to the user terminal, allowing the user terminal to determine the selection before accessing. This will cause network consumption and delay in user access. However, if the mobile communication operation network selected last time is simply adopted, for the WLAN user terminal that has reached the new WLAN network, it may result in that the currently selected network cannot be guaranteed to be the optimal PLMN network for the WLAN user terminal.
  • a WLAN user terminal when a WLAN user terminal is in a new WLAN network, it may be able to use a roaming relationship with the user terminal ’s home network, although the mobile communication network that it has accessed by default or the previously selected mobile communication network has a roaming relationship.
  • the new WLAN network where the user terminal is located may be directly connected to the home public land mobile network (HPLMN) or other better VPLMN.
  • HPLMN home public land mobile network
  • No new network selection can be performed, therefore, it is impossible to ensure that the user terminal selects the optimal PLMN network under the current WLAN network, such as HPLMN.
  • the WLAN user terminal can select an appropriate optimal mobile communication operation network access under a WLAN connected to multiple mobile networks at any time, and no specific solution has been proposed at present. Summary of the invention
  • the main object of the present invention is to provide an optimized interaction method for a user terminal in a wireless local area network to choose to access a mobile network, so that when a user terminal accesses from a WLAN connected to multiple mobile communication operating networks, It is necessary to optimize and select the optimal mobile communication operation network access process.
  • An optimized interactive method for a user terminal in a wireless local area network (WLAN) to select a mobile network includes the following steps:
  • the network or the WLAN user terminal After the WLAN user terminal establishes a wireless connection with the WLAN access network, the network or the WLAN user terminal initiates an access authentication process, and the WLAN access network sends a user name request message to the WLAN user terminal;
  • the WLAN user terminal After the WLAN user terminal receives a request for a user name message, the WLAN user terminal determines the current network selection information to be carried according to the monitoring result of whether the WLAN access network has changed or the user's autonomous selection information, and returns to the WLAN access network with the A packet of the determined network selection information;
  • the network judges whether the network selection information in the received message belongs to the mobile communication operating network currently connected to the WLAN, and if so, sends the access authentication request of the WLAN user terminal to the mobile communication identified by the network selection information Operating the network, otherwise, the network sends notification signaling to the WLAN user terminal, and the WLAN user terminal completes subsequent operations according to the content of the notification signaling.
  • the method further includes: setting a mobile communication operating network with the highest priority in the WLAN user terminal in advance.
  • Whether the WLAN access network changes in step b is determined according to the WLAN access identification information, and the determination of the network selection information further includes:
  • the WLAN user terminal detects the identification information of the current WLAN, and determines whether it is No WLAN access identification information and previous network selection information are stored, and if so, go to step b2; otherwise, go to step b3;
  • step b2 Determine whether the currently detected WLAN access identification information is consistent with the stored WLAN access identification information. If they are the same, then use the previous network selection information stored by itself as the network selection information to be carried currently, and end the current determination process Otherwise, execute step b3; b3. Use the preset mobile communication network information with the highest priority as the currently selected network selection information to be carried.
  • the method further includes: after the current WLAN user terminal successfully accesses the mobile communication operation network identified by the network selection information, the WLAN user terminal updates the WLAN access identification information stored in the WLAN user terminal to the currently detected WLAN access identification information, and determines the current success. Whether the accessed mobile communication operation network information is the same as the previous network selection information stored by itself. If they are different, update the previous network selection information stored by itself to the currently successfully accessed mobile communication operation network information. Otherwise, it does not update its own storage. Last network selection information.
  • the method further includes: first judging the currently successfully accessed mobile communication operation network information and a preset highest priority access Whether the information of the mobile communication operation network is the same, if it is different, continue to judge whether the information of the currently successfully connected mobile communication operation network is the same as the previous network selection information stored by itself; otherwise, update the previous network selection letter stored by itself step b2
  • step b2 further includes: judging whether the user's autonomous selection information has changed, and if so, accessing the newly set highest priority mobile communication
  • the operation network information is used as the current network selection information to be carried; otherwise, the previous network selection information stored by the current WLAN user terminal itself is used as the current network selection information to be carried.
  • the mobile communication operation network with the highest priority is the current WLAN user The home network of the terminal.
  • the WLAN access identification information is a service group identification SSID, or an access point identification APID, or a MAC address of the access point.
  • the determination of the network selection information in step b further includes: judging whether the user's autonomous selection information has changed, and if so, using the newly set most preferred access mobile communication operation network information as the current network selection information to be carried; otherwise, The previous network selection information stored by the current WLAN user terminal itself is used as the current network selection information to be carried.
  • the method further includes: after updating the stored network selection information, setting a valid survival time for controlling the stored content to time out and expire for the currently stored previous network selection information. Then, when the WLAN access network has not changed, the method further includes: judging whether a valid survival time of the previous network selection information stored by the WLAN access network exceeds, and if so, setting a preset mobile communication with the highest priority to access The operating network information is used as the current network selection information to be carried; otherwise, the previous network selection information currently stored by itself is used as the current network selection information to be carried, and the effective survival time continues to be consumed.
  • the method further includes: judging whether the currently successfully accessed mobile communication operating network information is the same as the previous network selection information stored by itself, and if different, then After updating the previous network selection information stored in itself, reset the valid lifetime of the last network selection information currently stored. If they are the same, determine whether the current WLAN user terminal uses the previous network selection information stored in itself to access successfully. If yes, the previous network selection information stored by itself is not updated and the effective survival time continues to be consumed; otherwise, the previous network selection information stored by itself is not updated and the effective lifetime of the network selection information is reset.
  • the network selection information is placed in a user identification field defined in a network access identification (NAI) format.
  • NAI network access identification
  • step c the network sends to the WLAN user terminal a notification signaling containing information about the mobile communication operating network to be released, and the method further includes: the WLAN user terminal receives After the notification signaling, a mobile communication operation network is reselected, and the network information corresponding to the selected mobile communication operation network is obtained according to the network information in the notification signaling; and then a message carrying the new network selection information is sent.
  • the step of returning to the WLAN access network the method further includes: the network waits for a response message from the user terminal after issuing the notification signaling, and does not receive a response after waiting for a certain period of time, the network actively sends the response to the WLAN user.
  • the terminal issues a selection result request.
  • the method further includes: the network ends the current authentication process after issuing the notification signaling, and the WLAN user terminal re-selects the mobile communication operation network and initiates access authentication to the WLAN access network again.
  • step c the network sends a notification signaling to the WLAN user terminal indicating that the currently selected network of the user terminal is invalid and the mobile communication operation network information needs to be downloaded, and the method further includes: the WLAN user terminal determining whether the mobile communication operation needs to be downloaded Network information, if necessary, the WLAN user terminal returns a response to the network that requires downloading network information; after receiving the response, the network publishes mobile communication operating network information to the WLAN user terminal; and the WLAN user terminal obtains mobile communication After operating network information, re-select a mobile communication operating network, and resend the access authentication request carrying the new network selection information to the WLAN access network, and return to step c; otherwise, do not process or return response information that does not need to be downloaded .
  • the method further includes: the network waits for a response message from the user terminal after issuing the notification signaling, and does not receive a response after waiting for a certain period of time, the network actively delivers the mobile communication operation network information to the WLAN user terminal.
  • the method further includes: the network ends the current processing flow after the notification signaling is issued, and if the WLAN user terminal needs to download network information, the WLAN user terminal actively sends a request to initiate a network information download flow.
  • the WLAN user terminal automatically selects mobile communication operation network information delivered by the network according to a preset parameter.
  • an optimized interaction method for a user terminal to choose to access a mobile network the user terminal sends an access carrying its own network selection information to the WLAN access network During the authentication request, the user terminal determines the current network selection information to be carried according to the monitored changes in the WLAN access network or the user's settings. If the mobile communication operation network to be accessed needs to be changed, a new network is selected. The information is sent to the WLAN access network, otherwise the network information used during the last successful access is also used to ensure that roaming users can choose the mobile communication operation network access in a timely and accurate manner, avoiding the user terminal's The repeated selection of the access network optimizes the access process of the user terminal.
  • 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 diagram of an optimized interaction processing flow for a user terminal of the present invention to select an optimal access to a mobile network
  • FIG. 5 is a schematic flowchart of user terminal access authentication and authorization according to the present invention.
  • FIG. 6 is a flowchart of an embodiment of a user terminal selecting optimal access to a mobile network for optimal interaction processing according to the present invention
  • FIG. 7 is a flowchart of another embodiment of an optimal interaction process for a user terminal to select an optimal access to a mobile network according to the present invention.
  • the basic idea of the present invention is: when the WLAN user terminal performs access authentication, the mobile communication operating network judged by the WLAN user terminal, and if so, sends new network selection information to the WLAN access network through the access authentication request, otherwise, continues Set the network information of the last successful access or preset The selected network access information for priority access is sent to the WLAN access network as network selection information; the WLAN access network identifies the mobile communication operation network to which the user terminal is to access based on the network selection information carried in the access authentication request, And the current user terminal is connected to the selected network for access authentication and subsequent operations, so that the user terminal can use an optimized process to select the optimal mobile communication operation network access.
  • the network selection information refers to the mobile communication operation network information connected to the WLAN network that the user terminal is currently accessing, and the selection information may be preset by the user terminal or may be a mobile communication operation released by the user terminal according to the network. Web selection information selected.
  • the network selection information may be placed in a field separately set in the access authentication request, or may be placed in a user identification field defined in a network access identification (NAI) format in the access authentication request.
  • NAI network access identification
  • the WLAN user terminal sends new network selection information to the WLAN access network in two cases: One is that the current WLAN network where the WLAN user is currently located changes, usually based on the monitored WLAN access identification information, such as services. Group identifier (SSID, Service Set Identifier) or access point identifier (APID) or MAC address of the access point, or other identification information released by the WLAN access network, such as: used to indicate its service area, operator, and operating brand And information such as geographic location, etc. If a WLAN user terminal changes location and enters a new WLAN access network, its corresponding SSID or APID or MAC address of the access point will change. Generally speaking, an SSID corresponds to at least one WLAN operator (WISP).
  • WISP WLAN operator
  • the PLMN to which the roaming relationship is connected is basically determined. Therefore, the optimal mobile operation network connection is selected according to the judgment of the SSID. Access can meet the requirements, but in some cases the PLMN connected to the same SSID will also be different because of different geographic locations.
  • the specific SSID, APID, or MAC address of the access point, or other detection parameters To make a judgment, the user can select it through configuration parameters. The other is that the user actively resets, that is, the user changes the autonomous selection information, that is, even if the WLAN where the user terminal is located has not changed, the user can re-select the The optimal mobile communication operation network to be accessed previously.
  • the user terminal selects an optimized interactive process for accessing the mobile communication operation network information. As shown in FIG. 4, it includes the following steps: When the WLAN user terminal or the network initiates access authentication In the following process, the WLAN user terminal initiates an access authentication process as an example. The WLAN user terminal first sends an access authentication request to the WLAN access network.
  • Steps 402 to 403 After the WLAN access network receives the request, the access authentication process is started between the WLAN access network and the user terminal, and the authentication protocol (EAP) process can be extended. Specifically, the WLAN access network sends a user identification request message to the user terminal, requesting the user name of the current user terminal. After receiving the request, the WLAN user terminal determines whether the WLAN access network is currently changed or the user is autonomous. Whether the selection information changes determines the network selection information, and then sends a response user identification message containing the network selection information to the WLAN access network, as shown in steps 502 and 503 in FIG. 5.
  • the network selection information may be placed in a user identification field in the NAI format. In the following, the network selection information is placed in a user identification field.
  • the user identification field includes a user name and a domain name.
  • the user's autonomous selection information refers to related network information that is entered or set when the user actively selects a mobile communication operation network to be accessed.
  • the network selection information There are three ways to determine the network selection information: 1) Select and determine a new mobile communication operation network based on changes in WLAN access identification information such as the SSID or APID or the MAC address of the AP; 2) Determine based on the autonomous selection information entered by the user 3) It is determined according to a preset mobile communication operation network of the highest priority access, the set mobile communication operation network of the highest priority access may be used as an initial selection network, and the mobile communication operation of the highest priority access may be the current WLAN The home mobile communication operation network of the user terminal.
  • the method specifically includes: The WLAN user terminal detects the SSID corresponding to the current WLAN access network, and determines whether it has stored the SSID and network selection information. If it has, it will detect The obtained SSID is compared with the stored SSID. If the SSID is the same, the network selection information is determined to be the previous network selection information stored by the SSID. If it is not the same, the preset mobile communication operation network information with the highest priority is used as the network. Selection information; if the SSID is not stored, the preset mobile communication network information with the highest priority is used as the network selection information.
  • the WLAN user terminal may further determine whether to reset the mobile communication operation network with the highest priority according to the user's independent selection information. If yes, then the information of the user ’s most recently set and most preferred access to the mobile communication operating network is sent to the WLAN access network as network selection information.
  • step 403 can also directly determine whether there is any change in the user's autonomous selection information, that is, determine whether the user has reset the mobile communication operation network with the highest priority access, and if so, access the mobile communication operation network with the latest priority set by the user.
  • the information is sent to the WLAN access network as network selection information. If there is no change, you can continue to use the mobile communication network that was successfully accessed last time, or you can further determine whether there is a change in the currently detected SSID and use it if there is a change.
  • the preset mobile communication network with the highest priority access; otherwise, the mobile communication network that was successfully accessed last time is used.
  • the user can re-select a new mobile communication operation network as the optimal mobile communication operation network access at any time according to the needs. For example, when the SSID or APID or the MAC address of the AP remains unchanged, the user terminal can be periodically reminded whether the terminal needs Optimize network selection, that is, whether to re-select a mobile communication operation network access that is better than the currently used mobile communication operation network.
  • Optimize network selection that is, whether to re-select a mobile communication operation network access that is better than the currently used mobile communication operation network.
  • an effective survival time can also be set in advance. If there is no change in the WLAN access network where the user terminal is located within the effective survival time range, the stored network selection information is always used; if it exceeds the effective survival time, Time, the user terminal needs to determine the network selection information again according to the WLAN access identification information.
  • the WLAN access network A is only connected to the mobile communication operation networks A and B.
  • the user terminal After a period of time, the user terminal is still in the WLAN In the access network A, but the WLAN access network A is connected to the mobile communication operation networks A, B, and C, and the mobile communication operation network C is optimal for the user terminal; or the user ’s geographical location changes to a new geographical location
  • the location of the WLAN operator has not changed, but due to different geographical locations, the mobile communication operators connected to the WLAN access network have increased C and D; in these cases, if the effective lifetime is not set, the user terminal does not Changing the WLAN access network where it is located may not select the optimal network, and the setting of the effective lifetime can ensure that the user terminal has the opportunity to select the optimal network.
  • the effective survival time is reset each time the WLAN user terminal updates the previous network selection information stored. When the storage is not updated, the effective survival time is continuously consumed. The so-called consumption can be in a time decreasing or time increasing manner. . In addition, if the current WLAN user terminal successfully accesses the network reselection process using the network delivery information, even if the network information that is currently successfully accessed is the same as the network selection information stored by the user terminal itself, the self-stored The network selection information also needs to reset the effective time to live.
  • the stored previous network selection information may be information of a mobile communication operation network or a list of mobile communication operation networks.
  • the stored network selection information is a list
  • the capacity of the list can be set by the user or determined by the performance of the terminal.
  • the process of updating the stored network selection information includes: determining whether the list space is full, and when the list space is full, in order to Add a new network selection information record and delete the oldest network selection information record in the list.
  • the value of the effective survival time can be changed by the user. For example: The user estimates that he needs to stay in the roaming country for 5 days, and the network conditions that he accesses every day will not change or the location of the stay will not change greatly. Then, he can set to store the previous network selection.
  • the effective survival time is 1 day, and work in a relatively fixed location to access the network every day, the network selection needs to be made only once a day, there is a certain delay in access time. It is also possible to directly set the effective survival time to 5 days. After selecting the network for the first time when arriving in the roaming country, network selection is basically no longer required, unless the access network changes, which can greatly optimize the access process.
  • Steps 404 to 405 After receiving the response message carrying the network selection information, the WLAN access network analyzes the user identification field in the response message; determines whether the network selection information carried in the user identification field is the WLAN connection If the mobile communication operation network of the mobile communication operation network is YES, step 406 is performed; otherwise, if the mobile communication operation network WLAN carried in the network selection information cannot be identified, step 407 is performed.
  • Step 406 According to the network selection information in the user identification field NAI, determine the mobile communication operating network to which the current user terminal is to access, and the WLAN access network sends the current user terminal's access authentication request to the mobile communication identified by the network selection information The operating network performs access authentication processing.
  • the WLAN access network determines that the access network information is included according to the network selection information carried in the user identification field
  • the WLAN access network sends the access authentication request to the user terminal according to the access network information in the user identification field.
  • the AAA Proxy of the access network to which it belongs, and the AAA Proxy forwards the access authentication request to the 3GPP AAA server of the home network of the user terminal for access authentication processing; otherwise, the WLAN access network
  • the access authentication request is sent to the AAA server of the network to which the user terminal belongs according to the network selection information in the user identification field for access authentication processing, as shown in step 506 in FIG. 5.
  • the AAA proxy accessing the network determines that the user identification field contains the access network information, and the access network information is the information of the access network.
  • the domain name part in the user identification field is changed to include only the home network domain name, and then the modified request is sent to the home network of the user terminal.
  • the current network If the WLAN network where the WLAN user terminal is currently located is directly connected to the home network of the WLAN user terminal, but the user terminal initiates an access authentication request using a roaming identifier, that is, the network selection information carried by the WLAN user terminal contains the access network information, the current network
  • the access network information in the user identification field NAI can be directly changed to the home network information; or, the current network can send a notification to the user terminal to remind the user that the current network is its home network. If the user terminal initiates access again with the home network information
  • the current network directly completes the authentication process, but if the user terminal still confirms that a roaming network is to be selected, the current network authenticates the user terminal through the roaming network and provides subsequent services.
  • Steps 407 to 408 The network side sends notification signaling to the current user terminal, and the current user terminal continues subsequent operations according to the content of the notification signaling.
  • the notification signaling may directly use the notification message EAP-Request / Notification in the WLAN protocol, or a separately set notification signaling.
  • the notification signaling sent by the network to the user terminal is divided into two cases: one is that the notification signaling directly contains the mobile communication operating network information to be released by the network, so that the WLAN user terminal or user can directly select; One is that the notification signaling is only used as a signaling to notify the user terminal that the currently selected mobile communication operation network information is invalid, and instruct the user terminal to download the mobile communication operation network information.
  • the user terminal can re-select a mobile communication operation network after receiving, and obtain the information according to the network information in the notification signaling. Select the network information corresponding to the mobile communication operation network, and then place the selected mobile communication operation network information in the user identification field of the response message
  • the network may wait for the selection response of the user terminal after issuing the notification signaling, and after waiting for a certain period of time, if no response is received, the network actively sends a selection result request to the user terminal; the network may also After issuing the notification signaling, the user terminal does not wait for the selection response of the user terminal, and ends the current processing flow, and the user terminal actively initiates the second access authentication process again.
  • the WLAN user terminal may automatically select or whether the user selects whether to download the mobile communication operation network information, and the WLAN user terminal automatically processes and automatically selects an appropriate mobile communication operation network.
  • the information is displayed to the user for selection when necessary. For example, a pop-up menu allows the user to select an appropriate network.
  • the user terminal may determine to select and display information that has a roaming relationship with the user's home network. If downloading is needed, the WLAN user terminal returns a response to the network to download the network information. After receiving the response, the network publishes the mobile communication operation network information to the user terminal.
  • the WLAN user terminal After the WLAN user terminal obtains the mobile communication operation network information, it selects again A mobile communication operation network, and re-initiates an access authentication request carrying new network selection information, and returns to step 403; if downloading is not required, the WLAN user terminal does not process or returns response information that does not require downloading.
  • the network may wait for the selection response of the user terminal after issuing the notification signaling, and after waiting for a certain period of time, if no response is received, the network actively publishes the mobile communication operation network information to the user terminal; the network may also issue the notification signaling after Without waiting for the user terminal's selection response, the current processing flow ends. If the user terminal needs to download network information, the user terminal actively sends a request to initiate the network information download flow.
  • 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 capacity QOS, bandwidth, service capacity, WLAN interworking scenarios, rates, and types of service providers.
  • a dedicated network information storage unit which generally includes the following parameters: network name, network bearer capacity QOS, bandwidth, service capacity, WLAN interworking scenarios, rates, and types of service providers.
  • the current WLAN user terminal After the current WLAN user terminal successfully accesses, it will update the stored SSID to the current The previously detected SSID updates the stored network selection information to the network information of the selected new network. Of course, if the current network selection information stored in the current WLAN user terminal is used for the current access, the storage need not be updated.
  • the WLAN access network where the roaming user terminal is located changes or the user wants to change the current mobile communication operation network to be accessed, he will select the best mobile communication operation network to access in time. And the current identification information and network selection information should be stored after each successful access; if the roaming user terminal does not need to reselect the network, it will continue to use the mobile communication operation network that was successfully accessed last time, thereby eliminating the need for network access
  • the user terminal delivers optional network information and other processes to optimize the access process.
  • the judgment of the network selection information in step 405 and the transmission of the notification information in step 407 may be completed by the same network entity.
  • This network entity may be referred to as a network information judgment and notification sending unit, and the network information judgment and notification
  • the sending unit may exist in a WLAN access network, such as being set in an access control device (AC); it may also exist outside the current WLAN access network and in a mobile communication operation network connected to the current WLAN access network, Services for multiple WLAN access networks at the same time, such as being set in an AAA server; a default AAA proxy can also be set in advance as the network information judgment and notification sending unit.
  • the user terminal may send the access authentication request before or at the same time, or at the same time.
  • a request is sent to the network for downloading the information of the current mobile communication operation network of the WLAN connection, that is, the user terminal can initiate the access authentication process after obtaining the information of the mobile communication operation network and selecting the network; or download
  • the network information process is parallel to the access authentication process.
  • the WLAN user terminal may send a request for downloading network information to the network by using EAP signaling or adopting a portal interaction mode.
  • the user terminal may also send a request for downloading the information of the mobile communication operation network of the current WLAN connection to the network after receiving the user identification message from the WLAN access network.
  • the request may be It is sent as an independent signaling; the request identifier can also be placed in the response user identification message, for example: the download request field is set in response to the empty user name, or when the user name in the response is OxFFFF. Indicates that network information needs to be downloaded.
  • FIG. 6 is a flowchart of an embodiment of an interaction process for a user terminal to select an optimal access to a mobile network according to the present invention.
  • the premise of the implementation of this embodiment is: In a 3GPP-WLAN interactive network, the current WLAN user terminal has successfully accessed the mobile device last time.
  • the communication operation network A itself stores the network information of the mobile communication operation network A and the SSID of the WLAN access network where it was last located, and the user terminal does not change the WLAN access network in which it is located.
  • This embodiment determines the WLAN connection based on the SSID. Whether the network access changes, of course, other parameters such as APID and AP's MAC address can also be used to determine according to the actual situation.
  • the optimized interaction processing process when the user terminal chooses to access the mobile communication operation network includes the following steps:
  • Steps 601 to 602 After a WLAN user terminal establishes a wireless connection with the WLAN access network, the user terminal sends an access authentication request to the WLAN access network; after the WLAN access network receives, sends a requesting user name to the user terminal Message EAP-Request [Identity].
  • Steps 603 to 604 After receiving the EAP-Request [Identity], the user terminal detects the SSID of the WLAN where the user terminal is currently located, and compares the SSID with the SSID stored in the user terminal. Since the WLAN where the user terminal is located has not changed, the current detection is performed. If the SSID is the same as the SSID stored in the SSID, the user terminal directly determines that the network information of the mobile communication operation network A is the current network selection information to be carried.
  • the user terminal sends a response user name message EAP-Response [Identity] carrying a NAI format user identification field to the WLAN access network, and the user identification field carries network information of the mobile communication operation network A.
  • Steps 605 to 606 The WLAN access network determines the mobile communication operation network to which the user terminal is to access according to the user identification field in the received message, and directly sends the access authentication request information to the mobile communication operation network A. Access authentication is performed in AAA proxy and AS. After the successful access, since the current WLAN user terminal uses the stored previous network selection information, it is not necessary to update the currently stored SSID and previous network selection information. In addition, if a valid survival time is set for the previous network selection information stored, the valid survival time will continue to be consumed.
  • FIG. 7 is a flowchart of another embodiment of a user terminal's interactive process of selecting an optimal access to a mobile network according to the present invention.
  • the premise of the implementation of this embodiment is: In a 3GPP-WLAN interactive network, the current WLAN user terminal has successfully accessed the last time.
  • the mobile communication operation network A itself stores network information of the mobile communication operation network A and the SSID of the WLAN access network where it was last located, and also sets default optimal network selection information, and the user terminal has roamed out of the previous location.
  • the WLAN access network enters a new WLAN access network. This embodiment determines whether the WLAN access network changes according to the SSID.
  • the optimal interactive processing process for the user terminal to select the mobile communication operation network includes the following steps:
  • Steps 701 to 702 After a WLAN user terminal establishes a wireless connection with a WLAN access network, the user terminal sends an access authentication request to the WLAN access network; after the WLAN access network receives, sends a requesting user name to the user terminal Message EAP-Request [Identity].
  • Steps 703 to 704 After receiving the EAP-Request [Identity], the user terminal detects the SSID of the WLAN where the user terminal is currently located, and compares the SSID with the SSID stored in the user terminal. Because the WLAN where the user terminal is located changes, the currently detected If the SSID is not consistent with the SSID stored by the SSID, the user terminal uses the default optimal network selection information as the network selection information to be carried currently.
  • the user terminal sends a response user name packet EAP-Response [Identity] carrying a NAI format user identification field to the WLAN access network, and the user identification field carries default optimal network selection information.
  • Steps 705 and 706 The WLAN access network determines a sending route of the WLAN user terminal access authentication request according to the user identification field in the received message, and as a result, the WLAN access network sends If the current user identification field cannot be identified, that is, it does not belong to one of the mobile communication operation networks connected to itself, the access authentication request is routed to the default AAA proxy.
  • Step 707 After receiving the access authentication request, the default AAA proxy finds that the network selection information therein does not match the mobile communication operation network connected to the WLAN network, and sends a notification signaling EAP-Request / Notification to the WLAN connection.
  • Network access the WLAN access network sends the notification signaling to the user terminal.
  • the notification signaling carries information of a mobile communication operating network connected to the WLAN, and the notification signaling may send one or a donat, and decide to end the interaction according to the indication information in the last EAP message.
  • Step 708 After receiving the mobile communication operation network information carried in the notification signaling, the user terminal performs network selection again.
  • the AAA proxy and the WLAN access network deliver the notification signaling, they wait for a response from the user terminal.
  • Steps 709 to 710 The AAA Proxy sends EAP-Request [Identity] signaling to the current WLAN user terminal again to request the user identity. After receiving the current WLAN user terminal, it returns the user ID carrying the new network selection information through the EAP- Response [Identity] message.
  • the WLAN access network determines the mobile communication operating network to which the user terminal is to access based on the new network selection information sent by the current user terminal, which refers to the VPLMN network, and sends the access authentication request information to the identified Access authentication processing is performed in the AAA proxy and AS of the VPLMN network.
  • the WLAN user terminal After the successful access, the WLAN user terminal needs to determine whether the currently successfully accessed mobile communication network information is the same as the previous network selection information stored by itself. If they are different, update the previous network selection information stored by itself to the current one. The information of the mobile communication operation network that has been successfully accessed, otherwise the previous network selection information stored by itself will not be updated. In addition, if a valid lifetime is set for the previous network selection information stored, then the previous network selection stored by itself is updated Information, the effective lifetime should be reset. However, if the previous network selection information stored by itself is not updated, the effective lifetime should also be reset, because the network selection information used for this access is reselected and has experienced once. The process of obtaining information from the network and reselecting the network.
  • the optimization interaction process described above can be set and used in combination with the existing network selection scheme according to the needs of the user's actual application environment. For example: The user can set a valid time for using the optimization method in advance. Within the valid time, use the above The optimization solution completes the network selection and access. After the effective time has passed, the existing method is also used to carry the preset optimal network selection with each access; or, the user selects when roaming away or the location changes frequently. Using the optimized interaction process described above, in the case of non-roaming, only the scheme carrying the preset optimal network selection for each access can be adopted.

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Description

无线局域网中用户终端选择接入移动网的优化交互方法 技术领域
本发明涉及网络接入技术， 特别是指一种无线局域网（WLAN )中用 户终端选择最优接入移动通信运营网的优化交互处理方法。 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， 目前应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分别为漫游情况下和非 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 )、 3GPP AAA服务器、 3GPP AAA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 WLAN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 WLAN接入网接入到 Internet/Intranet。如果 WLAN 用户终端还希望接入 3GPP分组交换（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给用户终 端发送接入允许消息，且 AS给用户终端分配相应的 PDG，用户终端与所 分配的 PDG之间建立隧道后，即可接入 3GPP PS域业务。同时， CGw/CCF 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 3GPP 访问网络向 3GPP归属网络申请接入到 Internet/Intranet。 如果用户终端还 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归属网络发起业务授权过程， 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给用户终 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 的 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 WLAN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 3GPP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， 那么， 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。 那么， 用户终端应如何选择需接入 的网络， 并将自身所选择的网络信息通知 WLAN 接入网， 以及 3GPP-WLAN互通网络如何利用用户终端的网络选择信息进行交互处理， 在另一专利申请中曾提出一种解决方案。 该专利申请的基本思想是： WLAN 用户终端通过接入认证请求将网络选择信息发送给 WLAN接入 网， WLAN接入网可以根据所携带的网络选择信息， 识别该用户终端所 要接入的移动通信运营网，并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。
但是， 如果每次 WLAN用户终端都进行网络选择， 对网络消耗会很 大。 比如某用户漫游到外地， 自己的归属移动通信运营网没有直接连接 到自身当前所在的 WLAN接入网， 如果用户终端每次都将自身归属网作 为初始的网络选择携带给 WLAN接入网， 那么每次接入都会触发网络选 择过程， WLAN 网络发送网络选择信息给该用户终端， 让该用户终端判 断选择后再接入，如此会导致网络消耗和用户接入的延迟。 而如果简单采 用上一次所选定的移动通信运营网， 对于已到达新 WLAN网络的 WLAN 用户终端而言， 可能会导致无法保障当前选定网络为该 WLAN用户终端 最优的 PLMN网络。 换句话说就是， 当 WLAN用户终端处于新 WLAN 网络下时，虽然其默认接入的移动通信运营网或前次选定的移动通信运营 网存在与该用户终端归属网络的漫游关系，可能能够使用，但该用户终端 所处的新 WLAN网络可能和归属公众陆地移动网络（ HPLMN )或其它更 好的 VPLMN有直接连接，这种情况下， 由于已有默认或选定的移动通信 运营网可以路由， 不能再进行新的网络选择， 因此， 无法保障用户终端选 择在当前 WLAN网络下最优的 PLMN网络， 比如： HPLMN。 如何才能 保证 WLAN用户终端在当前所属 WLAN发生变化时，能随时在一个连接 有多个移动网络的 WLAN下， 选择适当的最佳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用户终端选 择接入移动网的优化交互方法，使用户终端在从一个连接有多个移动通信 运营网的 WLAN接入时， 能够根据需要优化选择最优的移动通信运营网 接入过程。
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 )中用户终端选择接入移动网的优化交互方 法， 该方法包括以下步骤：
a. WLAN用户终端与 WLAN接入网建立无线连接后，网络或 WLAN 用户终端发起接入认证过程， WLAN接入网向该 WLAN用户终端发送请 求用户名报文；
b. 所述 WLAN用户终端收到请求用户名报文后， 根据 WLAN接入 网是否发生变化的监测结果或用户自主选择信息确定当前所要携带的网 络选择信息， 并向 WLAN接入网返回携带有所确定的网络选择信息的报 文；
c 网络判断所收到的报文中的网络选择信息是否属于当前 WLAN连 接的移动通信运营网， 如果是， 则将所述 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， 否则， 网络向所述 WLAN用户终端发送通知信令， WLAN用户终端根据通知信令的内容完 成后续操作。
该方法进一步包括： 预先在 WLAN用户终端设置一个最优先接入的 移动通信运营网。
步骤 b中所述 WLAN接入网是否发生变化根据 WLAN接入标识信息 进行判断， 所述网络选择信息的确定进一步包括：
bl. WLAN用户终端检测当前所在 WLAN的标识信息， 判断自身是 否存储有 WLAN接入标识信息和前次网络选择信息， 如果有， 则执行步 骤 b2; 否则， 执行步骤 b3;
b2. 判断当前检测到的 WLAN接入标识信息与自身存储的 WLAN接 入标识信息是否一致，如果一致， 则将自身存储的前次网络选择信息作为 当前所要携带的网络选择信息， 结束当前确定流程； 否则， 执行步骤 b3; b3. 将预先设置的最优先接入的移动通信运营网信息作为当前所要 携带的网络选择信息。
该方法进一步包括： 当前 WLAN用户终端成功接入网络选择信息所 标识的移动通信运营网后， WLAN用户终端更新自身存储的 WLAN接入 标识信息为当前检测到的 WLAN接入标识信息 , 判断当前成功接入的移 动通信运营网信息与自身存储的前次网络选择信息是否相同， 如果不同， 则更新自身存储的前次网络选择信息为当前成功接入的移动通信运营网 信息， 否则不更新自身存储的前次网络选择信息。
在判断当前成功接入的移动通信运营网信息与自身存储的前次网络 选择信息是否相同之前，该方法进一步包括： 先判断当前成功接入的移动 通信运营网信息与预先设置的最优先接入的移动通信运营网信息是否相 同，如果不同， 则继续判断当前成功接入的移动通信运营网信息与自身存 储的前次网络选择信息是否相同； 否则， 更新自身存储的前次网络选择信 步骤 b2中当前检测到的 WLAN接入标识信息与自身存储的 WLAN 接入标识信息一致时， 步骤 b2进一步包括： 判断用户自主选择信息是否 发生变化，如果是， 则将最新设置的最优先接入移动通信运营网信息作为 当前所要携带的网络选择信息； 否则， 将当前 WLAN用户终端自身存储 的前次网络选择信息作为当前所要携带的网络选择信息。
上述方案中， 所述最优先接入的移动通信运营网为当前 WLAN用户 终端的归属网络。 所述 WLAN接入标识信息为业务组标识 SSID、 或是接 入点标识 APID、 或接入点的 MAC地址。
步骤 b中所述网络选择信息的确定进一步包括：判断用户自主选择信 息是否发生变化，如果是，则将最新设置的最优先接入移动通信运营网信 息作为当前所要携带的网络选择信息； 否则， 将当前 WLAN用户终端自 身存储的前次网络选择信息作为当前所要携带的网络选择信息。
该方法进一步包括： 在更新存储的网络选择信息后， 为当前所存储的 前次网络选择信息设置一控制存储内容超时失效的有效生存时间。 那么， 在 WLAN接入网未发生变化的情况下， 该方法进一步包括： 判断自身存 储的前次网络选择信息的有效生存时间是否超过，如果是， 则将预先设置 的最优先接入的移动通信运营网信息作为当前所要携带的网络选择信息； 否则，继续将自身当前存储的前次网络选择信息作为当前所要携带的网络 选择信息， 且有效生存时间继续消耗。
当前 WLAN用户终端成功接入网络选择信息所标识的移动通信运营 网后，该方法进一步包括： 判断当前成功接入的移动通信运营网信息与自 身存储的前 网络选择信息是否相同，如果不同， 则更新自身存储的前次 网络选择信息后， 重新设置当前存储的前次网络选择信息的有效生存时 间， 如果相同， 再判断当前 WLAN用户终端是否采用自身存储的前次网 络选择信息接入成功，如果是， 则不更新自身存储的前次网络选择信息且 有效生存时间继续消耗， 否则， 不更新自身存储的前次网络选择信息且重 新设置该网络选择信息的有效生存时间。
上述方案中， 所述网络选择信息放置于以网络接入标识（NAI )格式 定义的用户标识字段中。
步骤 c中网络向所述 WLAN用户终端发送含有要发布的移动通信运 营网信息的通知信令， 则该方法进一步包括： 所述 WLAN用户终端收到 该通知信令后， 重新选定一个移动通信运营网， 并根据通知信令中的网络 信息得到该选定移动通信运营网对应的网络信息；然后再将携带有新网络 选择信息的报文发送给 WLAN接入网， 返回步骤（：。 那么， 该方法进一 步包括： 网络在下发通知信令后等待用户终端的响应报文， 等待一定时间 后未收到响应， 则网络主动向所述 WLAN用户终端下发选择结果请求。 或者， 该方法进一步包括： 网络在下发通知信令后结束当前认证处理， 所 述 WLAN用户终端重新选定移动通信运营网后，重新向 WLAN接入网发 起接入认证过程， 发送携带有新网络选择信息的接入认证信息。
步骤 c中网络向所述 WLAN用户终端发送指示用户终端当前所选网 络无效需要下载移动通信运营网信息的通知信令， 则该方法进一步.包括： 所述 WLAN用户终端确定是否需要下载移动通信运营网信息，如果需要， 则所述 WLAN用户终端向网络返回需要下载网络信息的响应； 网络收到 该响应后，向所述 WLAN用户终端发布移动通信运营网信息；所述 WLAN 用户终端获得移动通信运营网信息后， 重新选择一个移动通信运营网， 并 重新向 WLAN接入网发送携带有新网络选择信息的接入认证请求 , 返回 步骤 c; 否则， 不做处理或返回不需要下载的响应信息。 那么， 该方法进 一步包括： 网络在下发通知信令后等待用户终端的响应报文，等待一定时 间后未收到响应， 则网络主动向所述 WLAN用户终端下发移动通信运营 网信息。 或者， 该方法进一步包括： 网络在下发通知信令后结束当前处理 流程，如果所述 WLAN用户终端需要下载网络信息， 则该 WLAN用户终 端主动发请求发起网络信息下载流程。
上述方案中， 所述 WLAN用户终端根据预先设定的参数对网络下发 的移动通信运营网信息自动选择。
本发明所提供的无线局域网中用户终端选择接入移动网的优化交互 方法， 用户终端在向 WLAN接入网发送携带有自身网络选择信息的接入 认证请求时， 用户终端是根据所监测到的 WLAN接入网变化情况或用户 的设置来确定当前所要携带的网络选择信息，如果需要改变所要接入的移 动通信运营网， 就将新的网络选择信息发给 WLAN接入网， 否则还使用 上一次接入成功时所用的网络信息， 以保证漫游用户能够及时、准确地选 择移动通信运营网接入，避免了用户终端在每次接入时对接入网络的重复 选择， 优化了用户终端的接入过程。 附图简要说明
图 1为漫游情况下 WLAN系统与 3GPP系统互通的网络结构示意图； 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 为本发明用户终端选择最优接入移动网的优化交互处理流程示 意图；
图 5为本发明用户终端接入认证授权的流程示意图；
图 6 为本发明用户终端选择最优接入移动网优化交互处理的一实施 例流程图；
图 7 为本发明用户终端选择最优接入移动网优化交互处理的另一实 施例流程图。 实施本发明的方式
本发明的基本思想是： WLAN 用户终端在进行接入认证时， 判断自 的移动通信运营网，如果是， 则通过接入认证请求将新的网络选择信息发 送给 WLAN接入网， 否则， 继续将上一次成功接入的网络信息或预先设 置的优先接入的网絡选择信息作为网络选择信息发给 WLAN接入网； WLAN接入网根据接入认证请求中所携带的网络选择信息， 识别该用户 终端所要接入的移动通信运营网，并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，如此即可保证用户终端采用优化的过程选择最优 的移动通信运营网接入。
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，该选择信息可以是用户终端预先设置的，也可 以是用户终端才艮据网络发布的移动通信运营网选择信息选定的。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。
本发明中， WLAN用户终端在两种情况下向 WLAN接入网发送新的 网络选择信息: 一种是自身当前所在 WLAN网发生变化， 通常是根据所 监测到的 WLAN 接入标识信息， 如业务组标识 （SSID， Service Set Identifier )或接入点标识（ APID )或接入点的 MAC地址， 或 WLAN接 入网络发布的其他标识信息， 如： 用来表明其服务区域、 运营者、 运营品 牌、 地理位置等信息进行判断， 如果 WLAN用户终端改变位置进入一个 新的 WLAN接入网， 其对应的 SSID或 APID或接入点的 MAC地址就会 发生变化。 一般来说， 一个 SSID至少对应一个 WLAN运营商 （WISP ), 对于每个 WISP, 其所连接的有漫游关系的 PLMN是基本确定的， 因此根 据对 SSID的判断来选择最优的移动运营网接入是能够满足需求的， 但某 些情况下也会因为地理位置不同相同 SSID的 WLAN网络其连接的 PLMN 也会不同， 至于具体用 SSID、 APID还是接入点的 MAC地址， 或是其它 检测参数来进行判断，可由用户通过配置参数来选择。 另一种是用户主动 进行重新设置， 即用户改变了自主选择信息， 也就是说， 即使用户终端所 处的 WLAN没有发生变化， 用户也可以根据服务质量等需求重新选择当 前所要接入的最优的移动通信运营网。
基于图 3所示的网络结构，本发明中用户终端选择接入移动通信运营 网信息的优化交互处理过程， 如图 4所示， 包括以下步骤： 时， 由 WLAN用户终端或网络发起接入认证过程， 以下以 WLAN用户终 端发起接入认证过程为例， WLAN用户终端先向 WLAN接入网发送接入 认证请求；
步骤 402〜403： WLAN接入网收到请求后， WLAN接入网与用户终 端之间开始接入认证过程， 即可扩展认证协议（EAP )过程。 具体地说就 是: 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， 根据当前检测到的 WLAN 接入网是否变化或用户自主选择信息是否变化确定网络选择信息，然后向 WLAN接入网发送包含有网络选择信息的响应用户标识报文， 如图 5 中 步骤 502、 503所示。 该网络选择信息可放置于 NAI格式的用户标识字段 中， 下面均以网络选择信息放置在用户标识字段为例， 所述用户标识字段 包括用户名和域名两部分。这里， 用户自主选择信息是指用户主动选择所 要接入的移动通信运营网时输入或设置的相关网络信息。
其中， 网络选择信息的确定有三种方式： 1 )根据 SSID或 APID或 AP的 MAC地址等 WLAN接入标识信息的变化来选择确定新的移动通信 运营网； 2 )根据用户输入的自主选择信息确定； 3 )根据预先设置的最优 先接入的移动通信运营网来确定，所设置的最优先接入的移动通信运营网 可以作为初始选择网络， 该最优先接入的移动通信运营可以是当前 WLAN用户终端的归属移动通信运营网。
判断 WLAN接入网是否发生变化， 是将当前检测到的用户终端所在 或 AP的 MAC地址进行比较。 以根据检测到的 SSID区别不同 WLAN接 入网为例， 具体包括： WLAN用户终端检测当前所在 WLAN接入网对应 的 SSID, 判断自身是否存储有 SSID和网络选择信息， 如果有存储， 则将 检测到的 SSID和自身存储的 SSID进行比较， 如果相同， 则确定网络选 择信息为自身存储的前次网络选择信息； 如果不相同， 则将预先设置的最 优先接入的移动通信运营网信息作为网络选择信息； 如果自身未存储 SSID， 则将预先设置的最优先接入的移动通信运营网信息作为网络选择 信息。
在上述确定网络选择信息过程中， 如果检测到的 SSID与用户终端自 身存储的 SSID相同， WLAN用户终端还可进一步根据用户自主选择信息 判断是否重新设置了最优先接入的移动通信运营网，如果是， 则将用户最 新设置的最优先接入移动通信运营网信息作为网络选择信息发送给 WLAN接入网。
当然， 步骤 403也可以直接判断用户自主选择信息是否有变化， 即判 断用户是否重新设置了最优先接入的移动通信运营网，如果有， 则将用户 最新设置的最优先接入移动通信运营网信息作为网络选择信息发送给 WLAN接入网； 如果没有变化， 可以继续使用上一次接入成功的移动通 信运营网， 也可以再进一步判断当前检测的 SSID是否有变化， 有变化的 情况下就采用预先设置的最优先接入的移动通信运营网； 否则，使用上一 次接入成功的移动通信运营网。
用户可以在任何时刻根据需求重新选择新的移动通信运营网作为最 优的移动通信运营网接入， 比如：在 SSID或 APID或 AP的 MAC地址不 变的情况下， 可以定时提示用户终端是否需要进行网络选择的优化， 即： 是否需要重新选择比当前使用的移动通信运营网更优的移动通信运营网 接入。 对于所存储的网络选择信息也可以预先设置一个有效生存时间，如果 在有效生存时间范围内， 该用户终端所在的 WLAN接入网没有变化， 就 一直采用所存储的网络选择信息； 如果超过有效生存时间， 则需要用户终 端重新根据 WLAN接入标识信息硝定网络选择信息， 如此， 可更进一步 保证用户终端选择最优移动通信运营网接入。 比如： 用户终端在某一时刻 通过 WLAN接入网 A接入移动通信运营网时， WLAN接入网 A只连接 了移动通信运营网 A、 B, 经过一段时间后， 该用户终端仍处在 WLAN 接入网 A中， 但 WLAN接入网 A连接了移动通信运营网 A、 B、 C, 而 移动通信运营网 C对于该用户终端是最优的； 或者， 用户地理位置发生 改变， 到新地理位置的 WLAN运营商并没有改变， 但由于地理位置的不 同， 该 WLAN接入网连接的移动通信运营商增加了 C和 D; 在这些这种 情况下， 如果不设置有效生存时间， 用户终端不改变所处的 WLAN接入 网就可能不会选到最优网络， 而有效生存时间的设置，就可以保证用户终 端能有机会选到最优网络。
该有效生存时间在 WLAN用户终端每次更新所存储的前次网络选择 信息时， 都要重新设置， 不更新存储时， 该有效生存时间会不断消耗， 所 谓消耗可采用时间递减或时间递增的方式。 并且， 如果当前 WLAN用户 终端成功接入经历了利用网络下发信息进行网络重新选择的过程，则即使 当前接入成功的网络信息与该用户终端自身存储的网络选择信息相同，不 更新自身存储的网络选择信息， 也要重新设置有效生存时间。
这里， 所存储的前次网络选择信息可以是一个移动通信运营网的信 息，也可以是一个移动通信运营网的列表。 当所存储的网络选择信息是一 个列表时， 列表容量可以由用户设定或由终端性能决定； 更新所存储的网 络选择信息的过程包括： 确定列表空间是否已满， 当列表空间已满时， 为 了加入新的网络选择信息记录， 将列表中最老的网络选择信息记录删除。 该有效生存时间的值可以由用户设置改变， 比如： 用户估计需要在漫 游国停留 5 天， 每天接入的网络情况不会改变或停留的位置没有大的变 化， 则可以设置存储前次网络选择的有效生存时间为 1天， 而且每天在相 对固定的地点接入网络下工作，每天只有一次需要进行网络选择，接入时 间有一定延迟。也可以直接将有效生存时间设置为 5天，在到达漫游国时 首次选择网络后， 基本不再需要网络选择， 除非接入网络发生变化， 如此 可大大优化接入过程。
步骤 404~405： WLAN接入网收到携带有网络选择信息的响应报文 后，对该响应报文中的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络， 如果是， 则 执行步骤 406; 否则， 即网络选择信息中携带的移动通信运营网络 WLAN 不能识别， 则执行步骤 407。
步骤 406:根据用户标识字段 NAI中的网络选择信息，确定当前用户 终端要接入的移动通信运营网络， WLAN接入网将当前用户终端的接入 认证请求送到网络选择信息所标识的移动通信运营网络进行接入认证处 理。
这里， 如果 WLAN接入网根据用户标识字段中携带的网络选择信息 判断出包括访问网信息， 则 WLAN接入网根据用户标识字段中的访问网 信息将所述接入认证请求送至该用户终端所属访问网络的认证授权计费 代理（ AAA Proxy )， 再由该 AAA Proxy将所述的接入认证请求转送至该 用户终端归属网络的 3GPP AAA服务器进行接入认证处理；否则， WLAN 接入网根据用户标识字段中的网络选择信息将所述接入认证请求送至该 用户终端归属网络的 AAA服务器进行接入认证处理， 如图 5中步骤 506 所示。 其中， 访问网络的 AAA Proxy收到用户终端的接入认证请求后， 判断出用户标识字段中包含访问网信息，且访问网信息为本网信息， 则将 用户标识字段中的域名部分改为只包含归属网域名，然后再将修改后的请 求送往该用户终端的归属网络。
如果 WLAN用户终端当前所在的 WLAN网络就与该 WLAN用户终 端的归属网络直接相连， 但该用户终端采用漫游标识发起接入认证请求， 即所携带的网络选择信息中含有访问网信息，则当前网络可以直接将用户 标识字段 NAI 中的访问网信息改为归属网络信息； 或者， 当前网络可以 向该用户终端发送通知提示用户当前所在网络为其归属网络，如果用户终 端重新以归属网信息发起接入认证请求，则当前网络直接完成结入认证流 程，但如果用户终端仍确认要选择漫游网络， 则当前网络通过漫游网络对 该用户终端进行接入认证并提供后续服务。
步骤 407〜408： 网络侧向当前用户终端发送通知信令， 当前用户终端 根据通知信令的内容继续后续的操作。这里，所述的通知信令可以直接采 用 WLAN协议中的通知报文 EAP-Request/Notification, 也可以采用一条 单独设置的通知信令。 所述网络向用户终端发送的通知信令分为两种情 况： 一种是在通知信令中直接包含有网络要发布的移动通信运营网信息， 以便 WLAN用户终端或用户直接进行选择； 另一种是该通知信令只作为 一个通知用户终端当前所选移动通信运营网信息无效，并指示用户终端需 要下载移动通信运营网信息的信令。
对于第一种情况， 由于该通知信令中包括本 WLAN所连接移动通信 运营网络信息，则用户终端收到后可以重新选定一个移动通信运营网， 并 根据通知信令中的网络信息得到该选定移动通信运营网对应的网络信息， 然后再将所选定的移动通信运营网信息放置在响应报文的用户标识字段
NAI中， 再次送给 WLAN接入网络进行判别， 返回步骤 403。 这里， 网 络可以在下发通知信令后等待用户终端的选择响应，等待一定时间后，如 果未收到响应， 则网络主动向用户终端下发选择结果请求； 网络也可以在 下发通知信令后不等待用户终端的选择响应，就结束当前处理流程， 由用 户终端重新主动发起第二次接入认证过程。
对于第二种情况， WLAN 用户终端收到通知信令后， 可以自动选择 或由用户选择是否下载移动通信运营网信息， 所述 WLAN用户终端自动 处理， 自动选择适当的移动通信运营网，也可以在必要时把信息显示给用 户进行选择， 比如弹出菜单让用户选择一个适当的网络，给用户显示信息 时， 用户终端可以判断选择显示与用户归属网络有漫游关系的信息。如果 需要下载， 则由 WLAN用户终端向网络返回需要下载网络信息的响应； 网络收到该响应后， 向该用户终端发布移动通信运营网信息； WLAN 用 户终端获得移动通信运营网信息后，重新选择一个移动通信运营网， 并重 新发起携带有新网络选择信息的接入认证请求， 返回步骤 403; 如果不需 要下载， 则 WLAN用户终端不做处理或返回不需要下载的响应信息。 这 里， 网络可以在下发通知信令后等待用户终端的选择响应，等待一定时间 后， 如果未收到响应， 则网絡主动向用户终端发布移动通信运营网信息； 网络也可以在下发通知信令后不等待用户终端的选择响应，就结束当前处 理流程，如果用户终端需要下载网络信息， 则由用户终端主动发请求发起 网络信息下载流程。
在上述两种情况下，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 络信息下发， 如果没有则可以不下发， 或通知用户没有漫游关系存在。
当前 WLAN用户终端在本次接入成功后， 会更新存储的 SSID为当 前检测的 SSID, 更新存储的网络选择信息为所选新网络的网络信息。 当 然， 如果本次接入采用的就是当前 WLAN用户终端自身存储的前次网络 选择信息， 则不用更新存储。
上述方案对于漫游用户来说， 如果该漫游用户终端所在的 WLAN接 入网发生变化或用户自身想改变当前所要接入的移动通信运营网，则会及 时选择最佳的移动通信运营网来接入，且每次接入成功后要存储当前的标 识信息和网络选择信息； 如果该漫游用户终端不需要重新选择网络， 则继 续使用上一次接入成功的移动通信运营网，从而可省去网络向用户终端下 发可选网络信息等过程， 优化接入过程。
在上述方案中，步骤 405中对网络选择信息的判断和步骤 407中通知 信息的发送可由同一个网络实体完成，该网络实体可称之为网络信息判断 及通知发送单元， 该网络信息判断及通知发送单元可以存在于 WLAN接 入网中， 比如设置于接入控制设备（AC ) 中； 也可以存在于当前 WLAN 接入网外、 某个与当前 WLAN接入网相连的移动通信运营网中， 同时为 多个 WLAN接入网服务， 比如设置在一个 AAA服务器中； 还可以预先 设置一个缺省的 AAA Proxy作为该网络信息判断及通知发送单元。
在上述方案中，如果由用户终端发起接入认证流程， 而用户终端在接 入认证时不能确定所要选择的移动通信运营网，则用户终端可以在发送接 入认证请求之前或同时、或在接入认证过程中， 向网络发送需要下载当前 WLAN连接的移动通信运营网信息的请求， 也就是说， 用户终端可在获 得移动通信运营网信息并选择网络后，再发起接入认证过程； 或下载网络 信息过程与接入认证过程并行。这里， WLAN用户终端可采用 EAP信令、 或采用门户 （Portal ) 交互方式向网络发送下载网络信息请求。 该用户终 端也可以在收到 WLAN接入网发来的请求用户标识报文后， 向网络发送 需要下载当前 WLAN连接的移动通信运营网信息的请求， 该请求可以作 为一个独立的信令发送； 也可以将请求标识放置在响应用户标识报文中， 比如： 响应用户名为空而预先设定的下载请求字段被设置， 或直接约定响 应中用户名为 OxFFFF时表示需要下载网络信息。
图 6 为本发明用户终端选择最优接入移动网交互处理的一实施例流 程图，本实施例实现的前提是：在 3GPP-WLAN交互网络中， 当前 WLAN 用户终端上一次已成功接入移动通信运营网 A, 自身存储有移动通信运营 网 A的网络信息和上一次所在 WLAN接入网的 SSID， 并且该用户终端 未改变所处的 WLAN接入网， 本实施例根据 SSID来判断 WLAN接入网 是否变化， 当然也可以根据实际情况采用 APID、 AP的 MAC地址等其他 参数来判断。如图 6所示，用户终端选择接入移动通信运营网的优化交互 处理过程包括以下步骤：
步骤 601〜602： 当一个 WLAN用户终端和 WLAN接入网建立无线连 接后， 该用户终端向 WLAN接入网发送接入认证请求； WLAN接入网收 到后， 向该用户终端发送请求用户名报文 EAP-Request[Identity]。
步骤 603~604： 该用户终端收到 EAP-Request[Identity]后， 检测自身 当前所在 WLAN的 SSID, 并与自身存储的 SSID进行比较， 由于该用户 终端所处的 WLAN未发生变化，所以当前检测的 SSID与自身存储的 SSID 相同， 则该用户终端直接确定移动通信运营网 A的网络信息为当前所要 携带的网络选择信息。
然后， 该用户终端向 WLAN接入网发送携带有 NAI格式用户标识字 段的响应用户名报文 EAP-Response[Identity]，该用户标识字段中携带有移 动通信运营网 A的网络信息。
步骤 605~606： WLAN接入网根据所接收到报文中的用户标识字段， 确定该用户终端所要接入的移动通信运营网，并将接入认证请求信息直接 送到移动通信运营网 A的 AAA Proxy及 AS中进行接入认证处理。 在本次接入成功后 , 由于当前 WLAN用户终端采用的是所存储的前 次网络选择信息， 所以不必更新当前存储的 SSID和前次网络选择信息。 并且， 如果对该存储的前次网络选择信息设置了有效生存时间，该有效生 存时间会继续消耗。
图 7 为本发明用户终端选择最优接入移动网交互处理的另一实施例 流程图，本实施例实现的前提是：在 3GPP-WLAN交互网络中，当前 WLAN 用户终端上一次已成功接入移动通信运营网 A, 自身存储有移动通信运营 网 A的网络信息和上一次所在 WLAN接入网的 SSID, 还设置有缺省的 最优网络选择信息， 并且该用户终端已漫游出上一次所在的 WLAN接入 网， 进入新的 WLAN接入网， 本实施例根据 SSID来判断 WLAN接入网 是否变化。如图 7所示， 用户终端选择接入移动通信运营网的优化交互处 理过程包括以下步骤：
步骤 701〜702： 当一个 WLAN用户终端和 WLAN接入网建立无线连 接后， 该用户终端向 WLAN接入网发送接入认证请求； WLAN接入网收 到后， 向该用户终端发送请求用户名报文 EAP-Request[Identity]。
步骤 703~704： 该用户终端收到 EAP-Request[Identity]后， 检测自身 当前所在 WLAN的 SSID, 并与自身存储的 SSID进行比较， 由于该用户 终端所处的 WLAN发生变化， 所以当前检测的 SSID与自身存储的 SSID 不一致，则该用户终端将缺省的最优网络选择信息作为当前所要携带的网 络选择信息。
然后， 该用户终端向 WLAN接入网发送携带有 NAI格式用户标识字 段的响应用户名报文 EAP-Response[Identity]，该用户标识字段中携带有缺 省的最优网络选择信息。
步骤 705 706: WLAN接入网根据所接收到报文中的用户标识字段， 决定该 WLAN用户终端接入认证请求的发送路由，结果 WLAN接入网发 现用户标识字段无法识别， 即不属于与自身相连的移动通信运营网之一， 则将该接入认证请求路由到缺省 AAA Proxy。
步骤 707: 缺省 AAA Proxy收到该接入认证请求后，发现其中的网络 选择信息与本 WLAN网所连接的移动通信运营网都不符合， 则发送通知 信令 EAP-Request/Notification给 WLAN接入网； WLAN接入网再将该通 知信令下发给用户终端。 按照 EAP协议， WLAN接入网收到信令后和用 户接收信令后都会立即直接响应表明收到。 所述通知信令中携带有本 WLAN所连接的移动通信运营网信息， 该通知信令可以下发一条或多奈， 根据最后一条 EAP报文中的指示信息决定结束交互。
步骤 708： 用户终端收到通知信令中携带的移动通信运营网信息后， 重新进行网络选择。这里 , AAA Proxy和 WLAN接入网下发通知信令后， 会等待用户终端的响应。
步骤 709~710： AAA Proxy 再次向当前 WLAN 用户终端下发 EAP-Request [Identity]信令，请求用户标识。当前 WLAN用户终端收到后， 通过 EAP- Response[Identity]报文返回携带有新网络选择信息的用户标 识。
步骤 711~712： WLAN接入网根据当前用户终端发送的新网络选择信 息， 确定该用户终端所要接入的移动通信运营网， 这里指 VPLMN网络， 并将接入认证请求信息送到所标识的 VPLMN网络的 AAA Proxy及 AS 中进行接入认证处理。
在本次接入成功后， WLAN 用户终端要判断当前成功接入的移动通 信运营网信息与自身存储的前次网络选择信息是否相同，如果不同， 则更 新自身存储的前次网络选择信息为当前成功接入的移动通信运营网信息， 否则不更新自身存储的前次网络选择信息。 并且，如果对该存储的前次网 络选择信息设置了有效生存时间，那么， 更新了自身存储的前次网络选择 信息， 该有效生存时间要重新设置， 但是， 不更新自身存储的前次网络选 择信息，该有效生存时间也要重新设置， 因为本次接入所用的网络选择信 息是重新选择的， 经历了一次从网络获取信息、 重选网络的过程。
以上所述的优化交互过程，可以根据用户实际应用环境需要的情况与 现有的网络选择方案结合设置使用， 比如： 用户可以预先设置一个使用该 优化方法的有效时间，在有效时间内，使用上述优化方案完成网络的选择 和接入，有效时间过后，还采用现有的方法在每次接入时携带预先设置的 最优网络选择； 或者是， 用户在异地漫游或位置经常变化等情况下选择使 用上述优化交互过程，在非漫游的情况下，可以只采用每次接入时携带预 先设置最优网络选择的方案。
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 ) 中用户终端选择接入移动网的优化交 互方法， 其特征在于， 该方法包括以下步骤：
a. WLAN用户终端与 WLAN接入网建立无线连接后，网络或 WLAN 用户终端发起接入认证过程， WLAN接入网向该 WLAN用户终端发送请 求用户名报文；
b. 所述 WLAN用户终端收到请求用户名报文后， 根据 WLAN接入 网是否发生变化的监测结果或用户自主选择信息确定当前所要携带的网 络选择信息， 并向 WLAN接入网返回携带有所确定的网络选择信息的报 文；
c 网络判断所收到的报文中的网络选择信息是否属于当前 WLAN连 接的移动通信运营网， 如果是， 则将所述 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， 否则， 网络向所述 WLAN用户终端发送通知信令， WLAN用户终端根据通知信令的内容完 成后续操作。
2、 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 WLAN用户终端设置一个最优先接入的移动通信运营网。
3、 根据权利要求 2所述的方法， 其特征在于， 步骤 b中所述 WLAN 接入网是否发生变化根据 WLAN接入标识信息进行判断， 所述网络选择 信息的确定进一步包括：
bl. WLAN用户终端检测当前所在 WLAN的标识信息， 判断自身是 否存储有 WLAN接入标识信息和前次网络选择信息， 如果有， 则执行步 骤 b2; 否则， 执行步骤 b3;
b2. 判断当前检测到的 WLAN接入标识信息与自身存储的 WLAN接 入标识信息是否一致，如果一致， 则将自身存储的前次网络选择信息作为 当前所要携带的网络选择信息， 结束当前确定流程； 否则， 执行步骤 b3; b3. 将预先设置的最优先接入的移动通信运营网信息作为当前所要 携带的网络选择信息。
4、 根据权利要求 3所述的方法， 其特征在于， 该方法进一步包括： 当前 WLAN 用户终端成功接入网络选择信息所标识的移动通信运营网 后， WLAN用户终端更新自身存储的 WLAN接入标识信息为当前检测到 的 WLAN接入标识信息， 判断当前成功接入的移动通信运营网信息与自 身存储的前次网络选择信息是否相同，如果不同， 则更新自身存储的前次 网络选择信息为当前成功接入的移动通信运营网信息，否则不更新自身存 储的前次网络选择信息。
5、 根据权利要求 4所述的方法， 其特征在于， 在判断当前成功接入 的移动通信运营网信息与自身存储的前次网络选择信息是否相同之前，该 方法进一步包括：先判断当前成功接入的移动通信运营网信息与预先设置 的最优先接入的移动通信运营网信息是否相同，如果不同， 则继续判断当 前成功接入的移动通信运营网信息与自身存储的前次网络选择信息是否 相同； 否则， 更新自身存储的前次网络选择信息。
6、 根据权利要求 3所述的方法， 其特征在于， 步骤 b2中当前检测到 的 WLAN接入标识信息与自身存储的 WLAN接入标识信息一致时，步骤 b2 进一步包括： 判断用户自主选择信息是否发生变化， 如果是， 则将最 新设置的最优先接入移动通信运营网信息作为当前所要携带的网络选择 信息； 否则， 将当前 WLAN用户终端自身存储的前次网络选择信息作为 当前所要携带的网络选择信息。
7、 根据权利要求 2或 3所述的方法， 其特征在于， 所述最优先接入 的移动通信运营网为当前 WLAN用户终端的归属网络。
8、根据权利要求 3所述的方法， 其特征在于， 所述 WLAN接入标识 信息为业务组标识 SSID、或是接入点标识 APID、或接入点的 MAC地址。
9、 根据权利要求 2所述的方法， 其特征在于， 步骤 b中所述网络选 择信息的确定进一步包括：判断用户自主选择信息是否发生变化，如果是， 则将最新设置的最优先接入移动通信运营网信息作为当前所要携带的网 络选择信息； 否则， 将当前 WLAN用户终端自身存储的前次网络选择信 息作为当前所要携带的网络选择信息。
10、根据权利要求 4或 5所述的方法， 其特征在于， 该方法进一步包 括： 在更新存储的网络选择信息后， 为当前所存储的前次网络选择信息设 置一控制存储内容超时失效的有效生存时间。
11、 根据权利要求 10所述的方法， 其特征在于， WLAN接入网未发 生变化的情况下，该方法进一步包括： 判断自身存储的前次网络选择信息 的有效生存时间是否超过，如果是， 则将预先设置的最优先接入的移动通 信运营网信息作为当前所要携带的网络选择信息； 否则，继续将自身当前 存储的前次网络选择信息作为当前所要携带的网络选择信息，且有效生存 时间继续消耗。
12、根据权利要求 10所述的方法， 其特征在于， 当前 WLAN用户终 端成功接入网络选择信息所标识的移动通信运营网后， 该方法进一步包 括：判断当前成功接入的移动通信运营网信息与自身存储的前次网络选择 信息是否相同， 如果不同， 则更新自身存储的前次网络选择信息后， 重新 设置当前存储的前次网络选择信息的有效生存时间，如果相同，再判断当 前 WLAN用户终端是否采用自身存储的前次网络选择信息接入成功， 如 果是， 则不更新自身存储的前次网络选择信息且有效生存时间继续消耗， 否则，不更新自身存储的前次网络选择信息且重新设置该网络选择信息的 有效生存时间。
13、 根据权利要求 1所述的方法， 其特征在于， 所述网络选择信息放 置于以网络接入标识（NAI )格式定义的用户标识字段中。
14、 根据权利要求 1所述的方法， 其特征在于， 步骤 c中网络向所述 WLAN 用户终端发送含有要发布的移动通信运营网信息的通知信令， 则 该方法进一步包括： 所述 WLAN用户终端收到该通知信令后， 重新选定 一个移动通信运营网，并根据通知信令中的网络信息得到该选定移动通信 运营网对应的网络信息； 然后再将携带有新网络选择信息的报文发送给 WLAN接入网， 返回步骤0。
15、 根据权利要求 14所述的方法， 其特征在于， 该方法进一步包括： 网络在下发通知信令后等待用户终端的响应报文，等待一定时间后未收到 响应， 则网络主动向所述 WLAN用户终端下发选择结果请求。
16、根据权利要求 14所述的方法， 其特征在于， 该方法进一步包括： 网络在下发通知信令后结束当前认证处理， 所述 WLAN用户终端重新选 定移动通信运营网后， 重新向 WLAN接入网发起接入认证过程， 发送携 带有新网络选择信息的接入认证信息。
17、 根据权利要求 1所述的方法， 其特征在于， 步骤 c中网络向所述 WLAN 用户终端发送指示用户终端当前所选网络无效需要下载移动通信 运营网信息的通知信令， 则该方法进一步包括： 所述 WLAN用户终端确 定是否需要下载移动通信运营网信息， 如果需要， 则所述 WLAN用户终 端向网络返回需要下载网络信息的响应； 网络收到该响应后， 向所述 WLAN用户终端发布移动通信运营网信息； 所述 WLAN用户终端获得移 动通信运营网信息后， 重新选择一个移动通信运营网， 并重新向 WLAN 接入网发送携带有新网络选择信息的接入认证请求， 返回步骤 c; 否则， 不做处理或返回不需要下载的响应信息。
18、根据权利要求 17所述的方法， 其特征在于， 该方法进一步包括： 网络在下发通知信令后等待用户终端的响应报文，等待一定时间后未收到 响应， 则网络主动向所述 WLAN用户终端下发移动通信运营网信息。
19、根据权利要求 17所述的方法， 其特征在于， 该方法进一步包括： 网络在下发通知信令后结束当前处理流程， 如果所述 WLAN用户终端需 要下载网络信息， 则该 WLAN用户终端主动发请求发起网络信息下载流 程。
20、 根据权利要求 14或 17所述的方法， 其特征在于， 所述 WLAN 用户终端根据预先设定的参数对网络下发的移动通信运营网信息自动选 择。
21、 根据权利要求 11所述的方法， 其特征在于， 所存储的前次网络 选择信息为移动通信运营网列表。
22、 根据权利要求 21所述的方法， 其特征在于， 所述更新自身存储 的前次网络选择信息进一步包括： 判断列表空间是否已满， 如果是， 则删 除列表中最老的网络选择信息记录， 加入新的网络选择信息记录； 否贝1 J， 直接加入新的网络选择信息记录。
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EP1662813A1 (en) 2006-05-31
EP1662813B1 (en) 2008-01-16
CN1265589C (zh) 2006-07-19
DE602004011372D1 (de) 2008-03-06
JP4954704B2 (ja) 2012-06-20

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