WO2011000152A1 - 在无线局域网中移动终端漫游的方法、相关的接入控制器和接入点设备 - Google Patents
在无线局域网中移动终端漫游的方法、相关的接入控制器和接入点设备 Download PDFInfo
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- WO2011000152A1 WO2011000152A1 PCT/CN2009/072559 CN2009072559W WO2011000152A1 WO 2011000152 A1 WO2011000152 A1 WO 2011000152A1 CN 2009072559 W CN2009072559 W CN 2009072559W WO 2011000152 A1 WO2011000152 A1 WO 2011000152A1
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- Prior art keywords
- mobile terminal
- access point
- point device
- roaming
- mobility information
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Classifications
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- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
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- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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Definitions
- the present invention relates to wireless local area network (WLAN) technology in the field of communications, and in particular to a mobile terminal roaming technology in a wireless local area network.
- WLAN wireless local area network
- wireless local area networks such as WiFi networks
- WiFi networks are being widely used in home users and public hotspots to provide broadband high-speed wireless access services to mobile terminals.
- a single access point (AP) device supporting one or more mobile terminals is called a basic service set (BSS), wherein the AP device passes the basic service set identifier (BSSID). Identification.
- BSS basic service set
- Identification Two or more basic service sets form an Extended Service Set (ESS), usually an ESS is a single logical network segment (an ESS is in an IP subnet) and passes its service set identifier (ESSID) ) Identification.
- ESS Extended Service Set
- an ESS is a single logical network segment (an ESS is in an IP subnet) and passes its service set identifier (ESSID) ) Identification.
- Common WLAN network architectures have an autonomous network architecture and a centralized network architecture.
- the AP is configured as a separate network entity for independent management and assumes access to the mobile terminal.
- an access controller AC for configuring, managing, and controlling an AP device is configured, which performs wireless access to the mobile terminal together with the AP device.
- an AP device is also referred to as a Wireless Terminal Point (WTP) device.
- WTP Wireless Terminal Point
- the communication between the access controller AC and the WTP device it controls uses the Wireless Access Point Control and Configuration (CAPWAP) protocol, which defines two types of WTP device MAC models in a centralized wireless LAN architecture: Separate MAC model And the local MAC model.
- CAPWAP Wireless Access Point Control and Configuration
- the WTP device When the split MAC model is adopted, the WTP device is mainly used to receive and transmit wireless traffic, and the received traffic is not processed, but the access controller AC performs all access-related operations; when the local MAC model is adopted The WTP device completes all wireless MAC functions.
- the Inter Access Point Protocol aims to provide mobile terminals with mobile functions between AP devices to meet the increasing demand for mobility of mobile terminal users.
- IAPP protocol is only applicable to intra-network roaming between mobile devices in all AP devices in an ESS, where these AP devices are in the same network segment.
- the destination AP device sends a multicast packet with the MAC address of the mobile terminal to other AP devices in the ESS, so that other AP devices update their respective associations. table.
- MIP mobile IP
- HA Home Agent
- FA Foreign Agent
- MIP technology needs to be combined with the IAPP protocol.
- the Layer 3 MIP needs to support the IAPP protocol.
- the mobile agent discovery mechanism in MIP technology does not work.
- the communication between the access controller and its WTP device is based on Layer 3 tunneling. Whether it is a separate MAC model or a local MAC model, Layer 3 functionality should be supported in WTP devices.
- the foreign agent cannot be set in the WTP device, but should be set in the access controller or other higher logical location.
- the MIP Mobile Agent Advertisement (MAA) lifetime is generally set to 1 to avoid multicast storms, which means that the mobile terminal cannot be obtained by the third layer isolation of the WTP device.
- the MAA message sent by the external proxy server in the controller is generally set to 1 to avoid multicast storms, which means that the mobile terminal cannot be obtained by the third layer isolation of the WTP device.
- the MAA message sent by the external proxy server in the controller is generally set to 1 to avoid multicast storms, which means that the mobile terminal cannot be obtained by the third layer isolation of the WTP device.
- the MAA message sent by the external proxy server in the controller Vice versa, the external proxy server also cannot obtain the mobile proxy request sent by the mobile terminal.
- the present invention has been made in view of the above technical problems, and an object thereof is to provide a method for roaming a mobile terminal in a wireless local area network, which enables the mobile terminal to roam between different extended service sets or different subnets. It also provides efficient mobility management mechanisms based on the MIP protocol and IAPP protocol, especially for wireless LANs that use a centralized network architecture. In addition, the present invention also provides associated access controllers and access point devices.
- a method for roaming a mobile terminal in a wireless local area network comprising a plurality of extended service sets, wherein each extended service set includes at least one access controller and at least two connections An in-point device, wherein each access controller is configured to configure, control, and manage at least one access point device
- the method comprising: the destination wireless access point device receiving a roaming-related access request from the mobile terminal; According to the access request, the destination access controller to which the destination wireless access point device belongs acquires mobility information of the mobile terminal in the original extended service set, where the mobility information includes an association associated with the mobile terminal.
- the destination access controller determines whether roaming of the mobile terminal is roaming between different IP subnets or Roaming within the same IP subnet; when it is determined to be roaming between different IP subnets, the destination is connected Controller performs a Mobile IP based handover; and is determined when roaming within the same IP subnet, the destination access controller performs switching based on inter-access point protocol.
- a method for roaming a mobile terminal in a wireless local area network comprising a plurality of extended service sets, wherein each extended service set includes at least two access point devices
- the destination access point device receives the roaming-related access request from the mobile terminal, and the destination access point device acquires the mobility information of the mobile terminal in the original extended service set according to the access request,
- the mobility information includes information of an access point device and a mobile proxy server associated with the mobile terminal; Taking the mobility information, the destination access point device determines that the roaming of the mobile terminal is different.
- Roaming between IP subnets is still roaming within the same IP subnet; when it is determined to be roaming between different IP subnets, the destination access point device performs mobile IP based handover; In order to roam within the same IP subnet, the destination access point device performs handover based on an inter-access point protocol.
- an access controller including: a receiving module, configured to receive, from an access point device, a request related to roaming of a mobile terminal; a mobility information acquiring module, configured to Obtaining mobility information of the mobile terminal in the original extended set, where the mobility information includes information of an access point device, an access controller, and a mobile proxy server associated with the mobile terminal; a determining module, configured to determine, according to the acquired mobility information, whether roaming of the mobile terminal is roaming between different IP subnets or roaming within the same IP subnet; and a switching module, configured to determine It is a mobile IP-based handover when roaming between different IP subnets, and an inter-access point protocol-based handover when it is determined to be roaming within the same IP subnet.
- an access point device including: a receiving module, configured to receive an access request related to roaming from a mobile terminal; and a mobility information acquiring module, configured to perform, according to the access request Obtaining mobility information of the mobile terminal in the original extended set, where the mobility information includes information of an access point device and a mobile proxy server associated with the mobile terminal; and a roaming determining module, configured to obtain Mobility information, determining whether roaming of the mobile terminal is roaming between different IP subnets or roaming within the same IP subnet; and a switching module for determining that it is between different IP subnets When roaming, performing a mobile IP-based handover, and performing an inter-access point protocol-based handover when it is determined to be roaming within the same IP subnet.
- FIG. 1 is a schematic structural diagram of a wireless local area network to which a method of roaming a mobile terminal in a wireless local area network according to an embodiment of the present invention
- FIG. 2 is a side view of a mobile terminal roaming in a wireless local area network according to an embodiment of the present invention. Flow chart of the law;
- FIG. 3 is a schematic structural diagram of a wireless local area network to which a method for roaming mobile terminals in a wireless local area network according to another embodiment of the present invention is applicable;
- FIG. 4 is a flow chart of a method of roaming a mobile terminal in a wireless local area network according to another embodiment of the present invention.
- Figure 5 is a schematic block diagram of an access controller in accordance with one embodiment of the present invention
- Figure 6 is a schematic block diagram of an access point device in accordance with one embodiment of the present invention. detailed description
- the WLAN includes multiple ESSs (for simplicity, only two ESSs are shown: ESS1 and ESS2), where there is an access controller AC1 in ESS1 that controls the access point device WTP1.
- the access controller AC21 controls the access point device WTP2a
- the access controller AC22 controls the two access point devices WTP2b, WTP2c...
- the mobile terminal STA It is located in the coverage area of ESS1 and is accessed by the access point device WTP1. Then, the mobile terminal STA starts to move, and when it moves to the coverage area of the access point device WTP2a in the ESS2, the mobile terminal STA accesses. Switching of the point device WTP1 to the access point device WTP2a (first handover). When the mobile terminal STA continues to move into the coverage area of the access point device WTP2b, the mobile terminal STA occurs from the access point device WTP2a to the access point Handover of the device WTP2b (second handover).
- the mobile terminal STA When the mobile terminal STA continues to move into the coverage area of the access point device WTP2c, the mobile terminal STA occurs from the access point device WTP2b WTP2c point switching device (first switching three) above can be carried out every 2 handover method in a wireless local area network, a mobile terminal roaming explained by reference to FIG.
- the handover (first handover) of the mobile terminal STA from the access point device WTP1 to the access point device WTP2a is mainly described as an example.
- the access point device WTP1 is The access point device, correspondingly, the access controller AC1 is the original access controller, the ESS1 is the original expansion set; the access point device WTP2 is the destination access point device, and accordingly, the access controller AC21 is the destination Access controller, ESS2 is the destination expansion set.
- the access point device WTP2a receives the roaming-related access request transmitted from the mobile terminal STA.
- the mobile terminal STA moves from the coverage area of the access point device WTP1 of the ESS1 to the coverage area of the access point device WTP2a of the ESS2 (corresponding to the mark "101" in FIG. 1), it disconnects from the access point device The second layer connection of WTP1 (corresponding to the tag "102" in Fig. 1), and sends a request to the access point device WTP2a to re-associate with the access point device WTP2a (corresponding to the tag "103" in Fig. 1) .
- the request is a REASSOCIATE.request message.
- the access point device WTP2a After the access point device WTP2a receives the reassociation request, it performs corresponding processing according to the type of the MAC model of the access point device WTP2a.
- the access point device WTP2a adopts the local MAC model, that is, the access point device WTP2a performs processing of all MAC layers, first extracts the J of the original access point device WTP1 of the mobile terminal STA from the received re-association request! The identifier BSSID and the MAC address of the mobile terminal STA, etc., are then included in the MOVE.request message, for example, in the IAPP protocol, and sent to the access controller AC21 (corresponding to the tag "104" in FIG. 1) .
- the access point device WTP2a adopts the split MAC model, that is, the access point device WTP2a is only used to transmit and receive wireless traffic, the received re-association request is directly forwarded to the access controller AC21.
- Figure 1 only shows the case where the access point device WTP2a adopts the local MAC model.
- the access controller AC21 acquires the mobility information of the mobile terminal STA in the original extended service set ESS1 according to the received request.
- the mobility information includes information of an access point device, an access controller, and a mobile proxy server associated with the mobile terminal.
- the mobility information can be stored on the authentication server of the expansion set and indexed by the MAC address of the mobile terminal.
- the mobility information may include: a MAC address of the mobile terminal; a MAC address and an IP address of the associated access point device; a MAC address and an IP address of the associated access controller; an IP address of the home agent server; And the associated external proxy server IP address.
- the access controller AC to which the device belongs When the mobile terminal accesses an AP device of the extended service set for the first time, after the authentication server of the extended set authenticates the mobile terminal, the access controller AC to which the device belongs generates the mobility information of the mobile terminal. And send it to the authentication server for storage for future roaming and switching.
- the access controller AC may encapsulate the mobility information in an EAP message as an extended attribute, and the mobility information attributes in the extended EAP message are as follows:
- the access controller AC21 extracts the access from the received request (that is, the request processed by the access point device WTP2a or the re-associated request directly forwarded by the access point device WTP2a)
- the access controller AC21 requests the local authentication server AAAL, that is, the authentication server of the extension set ESS2, based on the extracted service set identifier BSSID of the access point device WTP1 and the MAC address of the mobile terminal STA. Authentication of the mobile terminal STA and transmission of mobility information of the mobile terminal STA (corresponding to the flag "105" in Fig. 1)
- the access controller AC21 may include the service set identifier BSSID of the access point device WTP1 and the MAC address of the mobile terminal STA in an ACCESS-REQUEST request, for example, in the IAPP protocol, and send it to the local authentication server AAAL.
- the local i-person certificate AAAL After receiving the request, the local i-person certificate AAAL receives the request according to the MAC of the mobile terminal STA. Address, authenticate the mobile terminal STA.
- the authentication server is an authentication, authorization, and accounting (AAA) server that authenticates the mobile terminal STA based on an Extensible Authentication Protocol (EAP).
- AAA authentication, authorization, and accounting
- EAP Extensible Authentication Protocol
- the local authentication server AAAL also retrieves the mobility information of the mobile terminal STA in the extension set ESS1 based on the MAC address of the mobile terminal STA.
- the mobility information of the mobile terminal STA in the extended service set ESS1 includes: a MAC address of the mobile terminal STA; a MAC address and an IP address of the access point device WTP1; a MAC address and an IP address of the access controller AC1; The IP address of the proxy HA server; the IP address of the external proxy J server.
- an external proxy server it can be a separate device or integrated into the access controller.
- Figure 1 shows the situation where an external proxy server is integrated into the access controller.
- the local authentication server AAAL first searches for the mobility information of the mobile terminal STA locally.
- the local authentication server AAAL Since the mobility information of the mobile terminal STA in the expansion set ESS1 is stored on the authentication server of the ESS1, the local authentication server AAAL does not find the mobile locally.
- the access controller AC21 receives the authentication information and mobility information of the mobile terminal STA from the local authentication server AAAL.
- the authentication server of the extended service set ESS1 may delete the mobility information after providing the mobility information of the mobile terminal STA to the local authentication server AAAL.
- step S210 based on the mobility information acquired in step S205, the access controller AC21 determines whether the roaming of the mobile terminal STA is roaming between different IP subnets or roaming within the same IP subnet.
- the access controller AC21 compares the IP address and the access point setting of the access point device WTP1 according to the acquired mobility information of the mobile terminal STA. If the IP address of the standby WTP2a belongs to the same network segment, if it belongs to the same network segment, it is determined that the roaming of the mobile terminal STA is roaming in the same IP subnet; if it does not belong to the same network segment, it is determined that the roaming of the mobile terminal STA is Roaming between different IP subnets.
- the IP addresses of the access point device WTP1 and the access point device WTP2a do not belong to the same network segment. Therefore, the access controller AC21 can determine that the mobile terminal STA is from the access point device WTP1 to the access point device WTP2a. Roaming belongs to inter-network roaming between different IP subnets.
- the access controller AC21 performs a mobile IP based handover (step S215).
- the external proxy server FA21 in the access controller AC21 triggers the standard mobile IP procedure, that is, registers the IP address of the destination external proxy server FA21 with the home agent server HA and requests the home agent server HA to update the binding.
- the home agent server HA binds the IP address of the original device FA21 to the mobile terminal STA.
- the access controller AC21 establishes a data forwarding tunnel between the external proxy server FA21 and the home agent server HA (corresponding to the flag "109" in Fig. 1), so that the home agent server HA can send it to the mobile terminal STA. Data is transmitted to the external proxy server FA21 through the data forwarding tunnel.
- context information related to the mobile terminal STA (corresponding to the flag "110" in Fig. 1) is transmitted between the destination external proxy server FA21 and the external proxy server FA1, which can be implemented by the IAPP message.
- the context information related to the mobile terminal STA may include data regarding a service that the mobile terminal STA is using, a user profile, security information such as a data session key, and the like.
- the access controller AC21 reconstructs the user environment of the mobile terminal STA based on the context information, and informs the access point device WTP2a that the handover is completed (corresponding to the flag "111" in Fig. 1) by, for example, the MOVE.response message of the IAPP protocol.
- the access controller AC21 After the mobile terminal STA switches to the access point device WTP2a, the access controller AC21 generates mobility information of the mobile terminal STA in the extended service set ESS2, and transmits the generated mobility information to the local authentication server AAAL. Store.
- the original access point device becomes the access point device WTP2a
- the original access controller becomes the access controller AC21
- the destination access point device becomes the access point device WTP2b
- the destination access controller Becomes the access controller AC22
- Both the original extended service set and the destination extended set become ESS2.
- the mobile terminal STA When the mobile terminal STA enters the coverage of the access point device WTP2b, it disconnects from the second layer of the access point device WTP2a and sends a re-association request to the access point device WTP2b.
- the access point device WTP2b After receiving the re-association request (step S201), the access point device WTP2b extracts the service set identifier BSSID of the access point device WTP2a and the MAC address of the mobile terminal STA, and encapsulates it in the MOVE of the IAPP protocol.
- the request message is sent to the access controller AC 22, or the re-association request is directly forwarded.
- the access point controller AC22 acquires the mobility information of the mobile terminal STA in the extended service set ESS2 from the local authentication server AAAL according to the received request (step S205).
- the mobility information of the mobile terminal STA at this time includes: a MAC address of the mobile terminal STA; a MAC address and an IP address of the access point device WTP2a; a MAC address and an IP address of the access controller AC21; a home agent J! IP address; IP address of the external proxy server FA21.
- the access controller AC22 compares the IP addresses of the access point device WTP2a and the access point device WTP2b (step S210), and finds that they belong to the same network segment, so it is determined that the roaming of the mobile terminal STA belongs to the same IP subnet. Intranet roaming. Then, the access controller AC22 performs an IAPP protocol-based handover (step S220).
- step S220 the access controller AC22 compares the IP addresses of the original access controller and the destination access controller to determine whether the original access controller and the destination access controller are the same access controller.
- the original access controller is the access controller AC21
- the destination access controller is the access controller AC22, and therefore, is a different access controller.
- the access controller AC 22 receives context information about the mobile terminal STA from the access controller AC 21, which can be done by the IAPP message. Then, the access controller AC22 reconstructs the user environment of the mobile terminal STA based on the received context information, and notifies the access point device WTP2b that the handover is completed.
- the access controller AC22 After the mobile terminal STA switches to the access point device WTP2b, the access controller AC22 generates mobility information of the new mobile terminal STA in the extended set ESS2, The generated new mobility information is transmitted to the local authentication server AAAL for storage.
- the third handover the original access point device becomes the access point device WTP2b, and the destination access point device becomes the access point device WTP2c, and the original access controller and the destination access controller are both access control.
- the AC22, the original extended service set and the destination extended set are also ESS2.
- the mobile terminal STA When the mobile terminal STA enters the coverage of the access point device WTP2c, the mobile terminal STA disconnects the second layer with the access point device WTP2b and sends a re-association to the access point device WTP2c, as in the previous two handovers. Request.
- the access point device WTP2c After receiving the re-association request (step S201), the access point device WTP2c extracts the service set identifier BSSID of the access point device WTP2b and the MAC address of the mobile terminal STA, and encapsulates it in the MOVE of the IAPP protocol.
- the request message is sent to the access controller AC 22, or the re-association request is directly forwarded.
- the access point controller AC22 acquires the mobility information of the mobile terminal STA in the extended service set ESS2 from the local authentication server AAAL based on the received request (step S205). Since the mobility information of the mobile terminal STA in the extended service set ESS2 is already stored on the local authentication server AAAL, the local authentication server AAAL locally finds the mobility information of the mobile terminal STA and associates it with the authentication information. Return to the access controller AC22 together.
- the mobility information of the mobile terminal STA at this time includes: a MAC address of the mobile terminal STA; a MAC address and an IP address of the access point device WTP2b; a MAC address and an IP address of the access controller AC22; an IP address of the home agent server HA ; The IP address of the external proxy server FA22.
- the access controller AC22 compares the IP addresses of the access point device WTP2b and the access point device WTP2c (step S210), and finds that they belong to the same network segment, so it is determined that the roaming of the mobile terminal STA belongs to the same IP subnet. Intranet roaming within. Then, the access controller AC22 performs an IAPP protocol-based handover (step S220).
- step S220 first, the access controller AC22 compares the IP addresses of the original access controller and the destination access controller to determine whether the original access controller and the destination access controller are the same access controller.
- both the original access controller and the destination access controller are both access controllers AC22 and, therefore, are the same access controller.
- the access controller AC 22 already knows the context information of the mobile terminal STA without rebuilding the mobile terminal STA. The user environment, therefore, directly informs the access point device that the WTP2C handover is complete.
- the access controller AC22 After the mobile terminal STA switches to the access point device WTP2c, the access controller AC22 generates mobility information of the new mobile terminal STA in the extended set ESS2, and transmits the generated information to the local authentication server AAAL. New mobility information for storage.
- the method for roaming mobile terminals in a wireless local area network of the present embodiment can implement global roaming of mobile terminals in a wireless local area network, which enables the mobile terminal to roam between different IP subnets using a fixed IP address, and It provides an efficient interworking mechanism between the MIP protocol and the IAPP protocol, and solves the problem caused by the application of mobile IP technology in a wireless local area network adopting a centralized network architecture.
- FIG. 3 is a block diagram showing a structure of a wireless local area network to which a mobile terminal roaming method in a wireless local area network according to another embodiment of the present invention is applied, wherein the wireless local area network adopts an autonomous network architecture.
- the WLAN includes multiple ESSs (for simplicity, only two ESSs are shown: ESS1 and ESS2), where there are two access point devices API 1, AP12 in ESS1, in ESS2 There are two access point devices AP21, AP22. Initially, the mobile terminal STA is located in the coverage area of the ESS1 and is accessed through the access point device AP12.
- the mobile terminal STA starts moving, and when it moves into the coverage area of the access point device AP21 in the ESS2, a handover of the mobile terminal STA from the access point device AP11 to the access point device AP21 occurs (first handover) .
- a handover (second handover) of the mobile terminal STA from the access point device AP21 to the access point device AP22 occurs.
- Each of the above-described handovers can be performed by the method of roaming the mobile terminal in the wireless local area network as explained below with reference to FIG.
- FIG. 4 is a flow chart showing a method of roaming a mobile terminal in a wireless local area network according to another embodiment of the present invention.
- the present embodiment will be described in detail below with reference to Figs. 3 and 4, wherein the same portions as those of the previous embodiment are appropriately omitted.
- the handover (first handover) of the mobile terminal STA from the access point device AP12 to the access point device AP21 in FIG. 3 is mainly described as an example.
- the access point device AP12 is For the original access point device
- ESS1 is the original extended service set
- access point device AP21 is the destination access point device
- ESS2 is the destination extended service set.
- the access point device AP21 receives an access request related to roaming transmitted from the mobile terminal STA.
- the mobile terminal STA moves from the coverage area of the access point device AP12 of the ESS1 to the coverage area of the access point device AP21 of the ESS2 (corresponding to the mark "301" in FIG.
- the access point device AP21 obtains the mobility information of the mobile terminal STA in the original extended service set ESS1 according to the received request.
- the mobility information includes information of an access point device and a mobile proxy server associated with the mobile terminal.
- the mobility information includes: a MAC address of the mobile terminal; a MAC address and an IP address of the associated access point device; an IP address of the home agent server; and an IP address of the associated external proxy server.
- the mobility information is stored on an authentication server of the extended service set and is indexed by the MAC address of the mobile terminal.
- the access point device AP21 extracts the J! service set identifier BSSID of the access point device AP12 and the MAC address of the mobile terminal STA from the received request.
- the access point device AP21 requests the local authentication server AAAL, that is, the authentication server of the extension set ESS2, based on the extracted service set identifier BSSID of the access point device AP12 and the MAC address of the mobile terminal STA.
- AAAL the authentication server of the extension set ESS2
- the access point device AP21 includes the service set identifier BSSID of the access point device AP12 and the MAC address of the mobile terminal STA in, for example, an ACCESS-REQUEST request in the IAPP protocol, and transmits it to the local authentication server AAAL.
- the local i-certificate server AAAL authenticates the mobile terminal STA according to the MAC address of the mobile terminal STA after receiving the request.
- the authentication server is an AAA server, which authenticates the mobile terminal STA based on the EAP.
- Other authentication protocols such as the RADIUS protocol, etc., can also be used.
- the local authentication server AAAL also retrieves the mobility information of the mobile terminal STA in the expansion set ESS1 based on the MAC address of the mobile terminal STA.
- move The mobility information of the mobile terminal STA in the extended service set ESS1 includes: a MAC address of the mobile terminal STA; a MAC address and an IP address of the access point device AP12; an IP address of the home agent server; and an external proxy server FA12 IP address.
- an external proxy server it can be a separate device or it can be integrated into the access point device.
- Figure 3 shows the situation where an external proxy server is integrated into the access point device.
- the local authentication server AAAL first searches for the mobility information of the mobile terminal STA locally.
- the local authentication server AAAL Since the mobility information of the mobile terminal STA in the extended J! ESS1 is stored on the authentication server of the ESS1, the local authentication server AAAL does not find it locally. For the mobility information of the mobile terminal STA, the local authentication server AAAL queries the authentication server of the extended service set ESS1 for the mobility of the mobile terminal STA according to the J! service set identifier BSSID of the access point device AP12 and the MAC address of the mobile terminal STA. Information (corresponding to the mark "305" in Fig. 3), and receiving mobility information of the mobile terminal STA (corresponding to the mark "306" in Fig.
- the access point device AP21 receives the authentication information and mobility information of the mobile terminal STA from the local authentication server AAAL.
- the access point device AP21 determines whether the roaming of the mobile terminal STA is roaming between different IP subnets or roaming within the same IP subnet. In this embodiment, the access point device AP21 compares whether the IP addresses of the access point device AP12 and the access point device AP21 belong to the same network segment. If they belong to the same network segment, it is determined that the mobile terminal STA is roaming in the same IP address. Roaming within a subnet; if not belonging to the same network segment, it is determined that the roaming of the mobile terminal STA is roaming between different IP subnets.
- the IP addresses of the access point device AP12 and the access point device AP21 do not belong to the same network segment. Therefore, the access point device AP21 determines that the mobile terminal STA is from the access point device AP12 to the access point device AP21. Roaming belongs to inter-network roaming between different IP subnets.
- the access point device AP21 performs a mobile IP based handover (step S415).
- the access point device AP21 registers the IP address of the destination foreign agent server FA21 with the home agent server and requests the home agent server HA to update the binding.
- the home agent server HA binds the IP address of the original external proxy server FA12 to the mobile terminal STA
- the IP address updated to the external proxy server FA21 is bound to the mobile terminal STA.
- the access point device AP21 establishes a data forwarding tunnel (corresponding to the tag "308" in FIG. 3) between the external proxy server FA21 and the home agent server HA, so that the home agent server HA can send it to the mobile terminal STA.
- context information related to the mobile terminal STA (corresponding to the tag "309" in FIG. 3) is transmitted between the destination foreign agent server FA21 and the original foreign agent server FA12, which can be implemented by the IAPP message.
- the context information associated with the mobile terminal STA may include data regarding the service the mobile terminal STA is using, user profile, security information such as a data session key, and the like. Based on these context information, the access point device AP21 can reconstruct the user environment of the mobile terminal STA, thereby completing the handover.
- the access point device AP21 After the mobile terminal STA switches to the access point device AP21, the access point device AP21 generates mobility information of the mobile terminal STA in the extended service set ESS2, and transmits the generated mobility information to the local authentication server AAAL. Store.
- the original access point device becomes the access point device AP21
- the destination access point device becomes the access point device AP22
- both the original extended service set and the destination extended service set become ESS2.
- the mobile terminal STA When the mobile terminal STA enters the coverage of the access point device WTP2b, it disconnects from the second layer of the access point device AP21, and sends a re-association request to the access point device AP22, where the request includes access The service set identifier BSSID of the point device AP21 and the MAC address of the mobile terminal STA.
- the access point device AP22 Upon receiving the reassociation request (step S401), the access point device AP22 acquires the mobility information of the mobile terminal STA in the extended service set ESS2 from the local authentication server AAAL (step S405).
- the mobility information of the mobile terminal STA in the extended service set ESS2 is already stored on the local authentication server AAAL, the local authentication server AAAL locally finds the mobility information of the mobile terminal STA and returns it together with the authentication information.
- the mobility information of the mobile terminal STA at this time includes: the MAC address of the mobile terminal STA; the MAC address and IP address of the access point device AP21; the IP address of the home proxy server HA; and the IP address of the external proxy server FA21.
- the access point device AP22 compares the IP addresses of the access point device AP21 and the access point device AP22, and finds that they belong to the same network segment, so it is determined that the roaming of the mobile terminal STA belongs to the same Intranet roaming within an IP subnet (step S410). Then, the access point device AP22 performs an IAPP protocol-based handover (step S420).
- step S420 first, the access point device AP22 receives context information related to the mobile terminal STA from the access point device AP21, which can be completed by the IAPP message. Then, the access point device AP22 reconstructs the user environment of the mobile terminal STA based on the received context information, thereby completing the handover.
- the access point device AP22 After the mobile terminal STA switches to the access point device AP22, the access point device AP22 generates new mobility information of the mobile terminal STA in the extended service set ESS2, and transmits the generated new information to the local authentication server AAAL. Mobility information for storage.
- the mobile terminal can be any terminal device that supports wireless access, such as a portable computer, a mobile phone, a personal digital assistant, and the like.
- FIG. 5 shows a schematic block diagram of an access controller 500 in accordance with one embodiment of the present invention.
- the present embodiment will be described in detail below with reference to the drawings, and the description of the same portions as those of the previous embodiments will be appropriately omitted.
- the access controller 500 of this embodiment includes: a receiving module 501, which receives a request related to roaming of a mobile terminal from an access point device; and a mobility information acquiring module 502, according to the received The request for obtaining the mobility information of the mobile terminal in the original extended service set; the roaming determining module 503, according to the acquired mobility information, determining whether the roaming of the mobile terminal is roaming between different IP subnets or in the same Roaming within the IP subnet; and a handover module 504 that performs mobile IP based handover when the roaming determination module 503 determines to be roaming between different IP subnets, and determines that the roaming determination module 503 is in the same When roaming within an IP subnet, switching between protocols based on the inter-access point is performed.
- the receiving module 501 receives a request related to roaming of the mobile terminal from the access point device it controls, such as a reassociation request REASSOCIATE.request or a MOVE.request connection request. Then, the mobility information obtaining module 502 acquires mobility information of the mobile terminal in the original extended service set, where the mobility information includes information of the access point device, the access controller, and the mobile proxy server associated with the mobile terminal. Specifically, the mobility information includes: a MAC address of the mobile terminal; The MAC address and IP address of the access point device; the MAC address and IP address of the associated access controller; the IP address of the home agent server; the IP address of the associated external proxy server.
- the extracting unit 5021 extracts the service set identifier BSSID of the original access point device of the mobile terminal, the MAC address of the mobile terminal, and the like from the request received by the receiving module 501, and then the requesting unit 5022 is based on the Extracting the service set identifier of the original access point device and the MAC address of the mobile terminal, requesting the local authentication server to authenticate the mobile terminal and the mobility information of the mobile terminal, and then receiving unit 5023 from the local
- the authentication server receives the authentication information and the mobility information of the mobile terminal, and provides the information to the roaming determination module 503.
- the mobility information of the mobile terminal includes: a MAC address of the mobile terminal; a MAC address and an IP address of the original access point device; a MAC address and an IP address of the original access controller; an IP address of the home proxy server; The IP address of the proxy server.
- the comparing unit 5031 compares the IP address of the original access point device with the IP address of the access point device that currently receives the re-association request of the mobile terminal, and belongs to the same network segment.
- the comparison result of the comparing unit 5031 is that the IP addresses of the two belong to the same network segment
- the first determining unit 5032 determines that the roaming of the mobile terminal is roaming within the same IP subnet.
- the comparison result of the comparing unit 5031 is that the IP addresses of the two do not belong to the same network segment
- the first determining unit 5032 determines that the roaming of the mobile terminal is roaming between different IP subnets.
- the switching module 504 performs a corresponding handover according to the result of the roaming determination module 503.
- the handover module 504 performs a Mobile IP based handover.
- the registration unit 5041 registers the IP address of the destination external proxy server with the home agent server, and requests the home agent server to update the binding, and the tunnel establishing unit 5042 establishes between the destination external proxy server and the home proxy server.
- the data forwarding tunnel, and then the context information transmission unit 5043, at the destination external proxy service information, is reconstructed by the reconstruction unit 5044 based on the context information, and the user environment of the mobile terminal is reconstructed.
- the notification unit 5045 notifies the current access point device that the handover is completed.
- the roaming determination module 503 determines to be roaming within the same IP subnet
- the handover module 504 performs an IAPP protocol based handover.
- the switching module 504 first, the second determining unit 5046 determines whether the two are the same access controller by comparing the original access controller of the mobile terminal with the IP address of the access controller 500.
- the context information transmission unit 5043 receives context information related to the mobile terminal from the original access controller, and then reconstructs the user environment of the mobile terminal by the reconstruction unit 5044, And the notification unit 5045 notifies the current access point device that the handover is completed.
- the access controller 500 may further include: a mobility information generating module 505 that generates mobility information of the mobile terminal in the current extended service set; and a mobility information transmission module 506 that transmits the generated information to the local authentication server Mobility information to store.
- the mobility information transmission module 506 can transmit mobility information using an EAP message.
- the access controller 500 of the present embodiment is operationally capable of implementing the method of roaming mobile terminals in a wireless local area network as shown in FIG. 2.
- FIG. 6 is a schematic block diagram of an access point device 600 in accordance with one embodiment of the present invention.
- the present embodiment will be described in detail below with reference to the drawings, and the description of the same portions as those of the previous embodiments will be appropriately omitted.
- the access point device 600 of this embodiment includes: a receiving module 601, which receives an access request related to roaming from a mobile terminal; and a mobility information acquiring module 602, according to the received access request, Acquiring the mobility information of the mobile terminal in the original extended service set; the roaming determining module 603 determines, according to the acquired mobility information, whether the roaming of the mobile terminal is roaming between different IP subnets or on the same IP subnet. And roaming module 604, which performs mobile IP-based handover when the roaming determination module 603 determines to be roaming between different IP subnets, and determines that the roaming determination module 603 is in the same IP sub- When roaming within the network, a handover based on an inter-access point protocol is performed.
- the receiving module 601 receives a roaming related access request sent by the mobile terminal, such as a REASSOCIATE.request reassociation request in the 802.11 protocol. Then, the mobility information obtaining module 602 obtains mobility information of the mobile terminal in the original extended access service set according to the access request.
- the mobility information includes information about the access point device and the mobile proxy server associated with the mobile terminal, specifically, including: The MAC address of the end; the MAC address and IP address of the associated access point device; the IP address of the home agent server; and the IP address of the associated external proxy server.
- the first extracting unit 6021 extracts the service set identifier BSSID of the original access point device of the mobile terminal, the MAC address of the mobile terminal, and the like from the received request, and then the request unit 6022 is based on The service set identifier BSSID of the original access point device extracted by the extracting unit 6021 and the MAC address of the mobile terminal request the local authentication server for the authentication of the mobile terminal and the transmission of the mobility information of the mobile terminal, and the receiving unit The 6023 receives the authentication information and the mobility information of the mobile terminal from the local authentication server.
- the mobility information obtaining module 602 provides the acquired mobility information of the mobile terminal to the roaming determination module 603 to determine whether the roaming of the mobile terminal is inter-network roaming or intra-network roaming.
- the comparing unit 6031 compares whether the IP address of the original access point device of the mobile terminal and the IP address of the access point device 500 belong to the same network segment.
- the determining unit 6032 determines that the roaming of the mobile terminal is roaming within the same IP subnet.
- the determining unit 6032 determines that the roaming of the mobile terminal is roaming between different IP subnets.
- the switching module 604 performs a corresponding switching operation according to the result of the roaming determining module 603.
- the handover module 604 performs a Mobile IP based handover.
- the registration unit 6041 registers the IP address of the destination external proxy server with the home agent server, and requests the home agent server to update the binding, and the tunnel establishing unit 6042 uses the home agent and the home agent at the destination.
- a data forwarding tunnel is established between the servers.
- the context information transmission unit 6043 activates the context information related to the terminal, and the reconstruction unit 6044 reconstructs the user environment of the mobile terminal based on the context information.
- the handover module 604 When the roaming determination module 603 determines to be roaming within the same IP subnet, the handover module 604 performs an IAPP protocol based handover. In this case, in the handover module 604, the context information transmission unit 6043 receives context information related to the mobile terminal from the original access point device of the mobile terminal, and provides the reconstruction information to the reconstruction unit 6044 for reconstructing the mobile terminal. User ring Circumstance.
- the access point device 600 of this embodiment may further include: a mobility information generating module 605 that generates mobility information of the mobile terminal in the current extended service set; and a mobility information transmission module 606 that sends the local authentication server to the local authentication server The generated mobility information is transmitted for storage.
- the mobility information transmission module 606 can transmit mobility information using EAP messages.
- the access point device 600 of the present embodiment is operationally capable of implementing a method of roaming a wireless terminal in a wireless local area network as shown in FIG.
- the access controllers, access point devices, and their respective components of the above embodiments may be comprised of semiconductors such as very large scale integrated circuits or gate arrays, such as logic chips, transistors, etc., or such as field programmable gate arrays,
- the hardware circuit implementation of the programmable hardware device such as the programmable logic device can also be implemented by software executed by various types of processors, or by a combination of the above hardware circuits and software.
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Priority Applications (6)
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PCT/CN2009/072559 WO2011000152A1 (zh) | 2009-06-30 | 2009-06-30 | 在无线局域网中移动终端漫游的方法、相关的接入控制器和接入点设备 |
KR1020127002304A KR101364475B1 (ko) | 2009-06-30 | 2009-06-30 | 무선 로컬 영역 네트워크, 관련된 액세스 제어기 및 액세스 포인트 디바이스에서 모바일 단말을 위한 로밍 방법 |
US13/381,260 US8953557B2 (en) | 2009-06-30 | 2009-06-30 | Roaming method for a mobile terminal in WLAN, related access controller and access point device |
EP09846681.6A EP2451213B1 (en) | 2009-06-30 | 2009-06-30 | Roaming method for mobile terminal in wireless local area network, related access controller and access point device |
CN2009801599614A CN102461259B (zh) | 2009-06-30 | 2009-06-30 | 在无线局域网中移动终端漫游的方法、相关的接入控制器和接入点设备 |
JP2012517996A JP5538536B2 (ja) | 2009-06-30 | 2009-06-30 | Wlan内の移動端末用のローミング方法、関連するアクセス・コントローラ、およびアクセス・ポイント・デバイス |
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US8953557B2 (en) | 2015-02-10 |
JP5538536B2 (ja) | 2014-07-02 |
KR20120046210A (ko) | 2012-05-09 |
JP2012531844A (ja) | 2012-12-10 |
US20120106514A1 (en) | 2012-05-03 |
EP2451213A4 (en) | 2014-07-02 |
EP2451213B1 (en) | 2017-03-01 |
KR101364475B1 (ko) | 2014-02-19 |
EP2451213A1 (en) | 2012-05-09 |
CN102461259A (zh) | 2012-05-16 |
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