WO2010135851A1

WO2010135851A1 - Method for releasing mobile station resource in proxy mobile ip and apparatus thereof

Info

Publication number: WO2010135851A1
Application number: PCT/CN2009/000590
Authority: WO
Inventors: 郑军; 马松伟; 姚春燕; 宾梵翔; 温海波
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2009-05-26
Filing date: 2009-05-26
Publication date: 2010-12-02
Also published as: CN102160339A

Abstract

A method for releasing mobile station resource in proxy mobile Internet Protocol (IP) and an apparatus thereof are provided by the present invention. A network access device detects the network connection state of the accessed mobile station, for example, it can detect the network connection state rapidly and effectively based on the 802.1x port access control state of the mobile station; thereby, a proxy mobile IP agent network element can release and recycle its relevant mobile IP network resource rapidly based on the network connection state after the network connection of the mobile station disconnects, its work load is relieved, and its work capability is enhanced.

Description

Method and device for releasing mobile station resources in proxy mobile IP

The present invention relates to the field of communications technologies, and in particular, to a resource management method and apparatus for a mobile station in a Proxy Mobile IP (PMIP) application environment. Background technique

Mobile IP refers to mobile stations, including computers, servers, terminals, network segments, etc., to achieve roaming functions across different network segments with specific network IP addresses, and to ensure that network rights based on IP networks do not occur during roaming. Change, achieve seamless connection of data and uninterrupted transmission. It is mainly composed of three functional entities: mobile station MS (Home Provider) and Home Agent (FA), and is discovered, registered, and transmitted by proxy ( Tunnel mode) These three basic functions work together to complete the routing function of the mobile site.

There are currently two technologies that enable mobile sites to support mobile IP. Depending on whether the mobile IP client is on the user side or the network side, it can be divided into CMIP (Client Mobile IP) and PMIP (Agent Mobile IP). For PMIP, mobile IP registration and deregistration and other mobile IP related messages are initiated by the network side proxy mobile IP proxy network element (PMIP Agent), which is the mobile IP function mobile. The site provides a proxy for mobile IP. The PMIP Agent can be located on a network function entity with the FA, or it can be located in a different network function entity from the FA. A PMIP Agent may manage multiple and even more mobile sites and provide proxy mobile IP services. Therefore, the PMIP Agent needs certain system resources and load capacity to maintain network access services and mobility management of its mobile stations. When the mobile station leaves the network to which the PMIP Agent belongs, the ideal scenario is that the PMIP Agent for the mobile station immediately releases the resources related to the mobile station and further informs other related network functional entities (such as FA) to release the Mobile site related network resources.

However, when deploying proxy mobile IP in an existing WLAN (wireless local area network) network, especially a large WLAN network, when a mobile station leaves its currently serving access network, The PMIP Agent cannot immediately obtain the information of the mobile station leaving. Therefore, for a period of time, the PMIP Agent still needs to maintain certain computing resources for the mobile station that has left, resulting in waste of resources on the PMIP Agent, especially considering the large WLAN. In a environment, a PMIP Agent usually needs to provide mobile IP proxy services for a large number of mobile stations. If the PMIP Agent cannot grasp the network connection status of the mobile station in real time, it will cause more computing resources to be wasted.

Further analysis, the mobile station's departure from the current access network is divided into two cases: 1), shutdown or power down; this situation makes the PMIP Agent itself unable to determine the connection status of the mobile station, thereby releasing relevant resources with the mobile station. 2) The mobile station disconnects the wireless AP (access point) of the current serving network and switches to the wireless AP of the other network. For mobile IP, when the new FA receives the handover request, it will send a handover notification to the previous access FA of the mobile station, so that until the mobile station receives a new access network handover notification, the mobile site is original. The access network will get the notification that the mobile station has switched to another network, thereby releasing the resources related to the mobile station, but this situation depends on the performance of the handover and the specific implementation. Summary of the invention

The present invention is directed to solving one or more of the foregoing technical problems, by detecting and timely reporting the network connection status of the mobile station, so that the relevant network element of the proxy mobile IP on the network side leaves the current network when the mobile station leaves the current network. The resources occupied by the mobile site are quickly released for recycling, reducing their workload and improving their working ability.

According to an aspect of the present invention, a method for releasing a mobile station resource in a proxy mobile IP is provided, including: Step a): A network access device detects a network connection status of the accessed mobile station; Step b The proxy mobile IP proxy network element releases its related mobile IP network resources after the network connection of the mobile station is disconnected according to the network connection status.

According to still another aspect of the present invention, there is provided a network access device for proxy mobile IP, comprising: detecting means for detecting a network connection status of the accessed mobile station; and for notifying the proxy mobile IP The network of the mobile station described by the proxy network element Notification device for connection status.

According to still another aspect of the present invention, there is provided a proxy mobile IP proxy network element device, comprising: interface means for obtaining a network connection status of a mobile station of its proxy; and after the mobile station network connection is disconnected A processing device that releases its associated mobile IP network resources for the mobile station.

According to still another aspect of the present invention, there is provided a communication device for use in a Proxy Mobile IP, comprising: detecting means for detecting a network connection status of an accessed mobile station; and for using the mobile station A proxy mobile IP proxy device that releases its associated mobile IP network resources for the mobile station after the network connection is disconnected.

The invention has the following technical advantages:

The proxy mobile IP proxy network element device can quickly obtain the network connection status of the mobile station of its proxy, and determine whether the mobile station has left the service network, thereby effectively releasing the computing resources related to the mobile station in a timely manner. Taking Wi F i technology as an example, the IEEE (American Institute of Electrical and Electronics Engineers) 802. lx protocol standard has become a commonly used authentication mechanism by monitoring the status of 802. lx authentication ports for a mobile site. Effectively determine whether the mobile site disconnects the current monthly network.

The solution has good scalability: By judging that the mobile point has left, the proxy mobile IP proxy network element device can further trigger the mobile IP deregistration message, thereby releasing the relevant computing resources for the mobile station in the mobile IP.

The solution has good scalability: The invention can be easily applied to existing mobile IP network devices by designing necessary software modules without modifying existing network protocols. DRAWINGS

The features, nature, and advantages of the present invention will become more apparent from the detailed description of the claims. Legend

FIG. 1 is a flowchart of a method for releasing a mobile station resource in a proxy mobile IP proxy according to the present invention; FIG. 3 is a schematic diagram of a network access device provided by the present invention; FIG.

FIG. 4 is a schematic diagram of a proxy mobile IP proxy device provided by the present invention. detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the proxy mobile IP network structure diagram shown in FIG. 1, a mobile station MS 11 establishes a wireless connection with a CPE (client device) in its home WALN network 10, and then a network access device DSLAM through its home network 50 (user Line Access Multiplexer) 51 Enjoy network access services. With the popularity of WLAN networks, the scale of WLAN networks continues to increase, and the evolution from WLAN networks in a single home to large-scale hotspot WLAN networks 20 has emerged. Mobile sites 11 can be implemented in different WALN networks 10 and 20 through mobile IP technologies. The roaming between the two, when it roams to the foreign network 30, the mobile station 11 will implement the mobile IP through proxy discovery, registration, and tunnel establishment. In this manner, the mobile station 11 uses the IP address of the home network 50 as the source address when sending the packet to its remote communication node 71, so that the mobile station 11 appears to be always connected to the home network 50 even if the mobile station 11 roams to the foreign network. 30, the communication node 71 is still unaware of its movement, and the data packet with the destination address of the mobile station 11 first arrives at the home network 50, intercepted by the home agent 52 in the home network, and then these data are grouped through the tunnel 41. The care-of address transmitted to the foreign network 30 where the mobile station 11 is located.

For the hotspot large WLAN network 20, the number of mobile stations connected to its single wireless access point AP 21 will be more, and with the popularity of WLAN applications and the increase of the network scale, the mobile stations 11 are at different wireless access points. The inter-handover frequency also increases. The mobile IP network element devices such as DSLAM 31 and Foreign Agent (FA) 32 that implement the function of proxy mobile IP proxy network element in the legend need more computing resources to maintain communication of mobile stations within their service scope. For example, DSLAM 31 will assist without The mobile station 11 of the mobile IP protocol stack has mobile IP capability. It can convert the mobile station's DHCP protocol encapsulation packet into a mobile IP control packet to complete mobile IP registration, data forwarding, data caching, and the like. When the mobile station 11 leaves the currently connected wireless access point AP 21, the proxy mobile IP network element device should release the network required by the mobile station in time. Network resources.

In the example of FIG. 1 provided by the present invention, the wireless access point AP 21 functions as a network access device, and detects the network connection status of the mobile station to which the mobile IP is accessed and can inform the DSLAM 31 in time. Currently, the IEEE 802. lx protocol has gradually become a widely adopted authentication method for WLAN applications. The 802.1 access control technology is also an enhanced network security solution for wireless local area networks. When the mobile station 11 is associated with the wireless access point AP 21, whether the WLAN service can be used depends on the authentication result of 802. lx, and if the authentication passes, the wireless access point AP 21 turns on (ON) the logic for the mobile station. Port, otherwise users are not allowed to access the Internet. The mobile station 11 installs the 802. lx client software, and the wireless access point AP 21 embeds the 802. lx authentication agent. At the same time, it also acts as an authentication client, and forwards the user's authentication information through the RADIUS (Remote Authentication Dial-In User Service) protocol. Give the remote RADIUS authentication server (not shown in the figure). In the illustration provided by the present invention, the wireless access point AP 21 can detect the 802. lx port access control state of the mobile station 11, for example: IEEE 802. The lx protocol maintains a state machine for each authenticated user. Based on the state machine as a trigger mechanism, when detecting that the mobile station 11 disconnects the network, it constructs a notification message to be sent to the DSLAM 31 having the function of the proxy mobile IP proxy network element; or the wireless access point AP 21 is also acceptable from The polling or query of the DSLAM 31 responds to the response of the requested mobile station 11 by detecting the network connection status.

Preferably, the suggested notification message can refer to the standard mobile IP deregistration request.

(De-Reg is ter Reques t ) is designed such that the proxy mobile IP proxy network element receiving the notification can release the resources allocated for the mobile station according to the message; in the polling or query mode, if polled or queried The mobile station network connection status is disconnected, it can provide a response message, suggesting that the response message can refer to the standard mobile IP to register the reply.

(De-Reg i s ter Rep ly ) is designed such that the proxy mobile IP proxy network element receiving the notification can release the response message as a resource allocated for the mobile station.

Through the method in the solution, the access network of the AP 21 connected to the mobile station can know the connection/leave status of the mobile station in time, and facilitate the access network operator to charge the mobile user: The operator can accurately Ground connection to mobile users Timing, which in turn increases billing accuracy.

In the example of FIG. 1 provided by the present invention, the DSLAM 31 implements a proxy mobile IP proxy network element function, which will release the network connection state of the wireless access point AP 21 in time after the network connection of the mobile station is disconnected. The network resources of the mobile station, for example: the mobile station moves IP registration, data forwarding, data buffer, etc. in the mobile IP network, and triggers a mobile IP to register request (De-Reg is ter Reques t) message to the FA on the network side. 32, thereby further releasing other network resources related to the mobile station in the mobile IP.

A person skilled in the art may also understand that the foregoing 802. lx port access control function and its detection and proxy mobile IP proxy network element function may be implemented in the same network entity, for example, the DSLAM 31 is acting as a proxy mobile IP proxy network element. 802. lx port access control function and its detection, and the remote wireless access point AP 21 is only a typical wireless termination point WTP; or, the wireless access point AP 21 can be an enhanced wireless access point The utility model has the function of proxy mobile IP proxy network element while having the 802. lx port access control function and its detection.

FIG. 1 is a flowchart of an example of a method for releasing mobile resource resources in a proxy mobile IP proxy according to the present invention, which includes the following steps:

Step S201, the DSLAM 31 as the proxy mobile IP proxy network element obtains the network connection status from the mobile station 11 under the wireless access point AP 21, in a manner, the wireless access point AP 21 is at the 802. lx logical port of the mobile station 11. Transition to the OFF state, the network connection is in the leave/disconnect state, and it actively sends a connection status notification message, which can be standardized as a deregistration request message in a mobile IP, and the message definition can refer to relevant standards; Or another way, the DSLAM 31 polls the wireless access point AP 21 for the network connection status of the mobile station 11 to obtain a response of its network connection status; or the DSLAM 31 connects to the wireless when the mobile agent service resource is tight. The ingress AP 21 queries the mobile station 11 for the network connection status to obtain a response to its network connection status.

Step S202, if the network connection of the mobile station 11 is disconnected, the DSLAM 31 acting as the proxy mobile IP proxy network element will release the network resources allocated for the mobile station, for example: DSLAM 31 as the proxy mobile IP proxy network element, for the mobile Mobile IP assigned by the site Resources such as registration, data forwarding, data caching, etc. The DSLAM 31 may further trigger a network-side related mobile IP resource release procedure. Specifically, it sends a Mobile IP De-Register Request message to the foreign agent 32. The mobile IP de-registration message has the same format as the registration message, but The life cycle in the message is set to zero, and the CoA address is set to the home address of the mobile station.

Step S203, the foreign agent 32 to process the received registration request message, the home agent 52 and forwards the Mobile IP Registration Request to (De-Register Request) ₀

Step S2Q4, the home agent 52 sends a De-Register Reply message to the foreign agent 32, accepting the mobile IP address registration request of the mobile station.

In step S2Q5, the foreign agent 32 processes the deregistration reply message and forwards it to the proxy network element DSLAM 31 corresponding to the mobile station 11.

Step S206, the proxy network element DSLAM 31 responds to the de-registered reply message from the foreign agent 32 (De-Register Response).

Step S207, the foreign agent 32 confirms the De-Register Confirmation message sent by the proxy network element DSLAM 31.

However, those skilled in the art should understand that the foregoing method for releasing mobile station resources in the proxy mobile IP is only one embodiment, and the proxy mobile IP proxy network element and its network side mobile agent (FA or HA) reside in the foregoing mobile station. The order in which the network connection state determines and releases the relevant network resources and releases the network resources can be changed.

FIG. 3 is a schematic diagram of a network access device provided by the present invention. Generally, when a mobile station 11 is wirelessly associated with a network access device wireless access point AP 21, its PAE (port access entity) passes the established wireless link. Providing user credentials to the authenticator PAE 301 in the access point 21, the authenticator PAE 301 can forward the user credentials to a separate authenticator server, typically, it attempts to connect via the RADIUS (Remote Authentication Dial-In User Service) protocol The parameter is sent to the remote RADIUS authenticator server for authentication. If the authentication is passed, the wireless access point AP 21 opens the 802. lx logical port 302 for the mobile station 11 to allow the user to use the WLAN monthly service 303.

Here, we can set up a detecting device 310 at the wireless access point AP 21 and Notification device 320, wherein:

The detecting device 310 detects the 802. lx logical port 302 corresponding to the accessed mobile station, thereby constructing and maintaining a dual-group mobile station network connection state table: <mobile station MAC, 802. lx logical port status 〉. When the network connection status of the mobile station 11 changes to OFF, indicating that the mobile station is in the network connection away/disconnect state, the notification device 320 will send a notification message to the proxy mobile IP on the network side by the trigger mechanism of the detecting device 310. Proxy network element device. Preferably, we suggest that the notification message can be standardized as a De-Regist message request message in a mobile IP whose message definition can refer to the relevant standard. Of course, the notification device 320 can also accept the polling/query from the proxy mobile IP proxy network element device on the network side, and provide the network connection status of the polled/queried mobile station by detecting the network connection status table of the device 310. The response message, preferably, we propose to change the response message to a standard mobile IP to register the response message, the message definition can refer to the relevant standard.

FIG. 4 is a schematic diagram of a proxy mobile IP proxy device provided by the present invention, which includes an interface device 410 and a processing device 420, where:

The interface device 410 can receive a notification message from the user side network access device that includes the mobile station network connection status, for example, a deregistration request message in a mobile IP indicates that a mobile station disconnects from the network access device; or The interface device 410 can poll the mobile station network connection status to obtain a response of its network connection status; or the interface device 410 can obtain a specific mobile station network connection status by querying when the mobile IP proxy service resource is tight. response.

According to the notification or response, for the mobile station whose network connection status is disconnected, the processing device 420 may check the mobile IP resource occupation status and decide whether to release the computing resources related to the mobile station, for example: the mobile station is in the The processing device 420 may instruct the interface device 410 to further send a deregistration request message to the mobile agent device on the network side, thereby further releasing the mobile station in the mobile IP related to the mobile IP registration function, the data forwarding, the data buffer, and the like. Other network resources. However, those skilled in the art should understand that the processing device 420 determines and releases relevant network resources according to the notification or response, and further notifies other mobile IP network element devices to release network resources. The order can be changed.

Other variations to the disclosed embodiments can be understood and effected by those skilled in the <RTIgt; In the claims, the <RTIgt; "comprising"</RTI> does not exclude other elements and steps, and the word "a" does not exclude the plural. In the practical application of the present invention, a part may perform the functions of a plurality of technical features cited in the claims. Any reference signs in the claims should not be construed as limiting the scope.

Claims

Claim

A method for releasing mobile station resources in proxy mobile IP, characterized by comprising the steps of:

Step a), the network access device detects the network connection status of the accessed mobile station;

Step b), the proxy mobile IP proxy network element releases its related mobile IP network resource after the network connection of the mobile station is disconnected according to the network connection status.

2. The method according to claim 1, wherein said step b) comprises: step bl), the network access device constructs a notification message to the proxy mobile IP proxy network when the mobile station disconnects the network connection Yuan

Step b2), the proxy mobile IP proxy network element releases the mobile IP network resource related to the mobile station according to the notification message.

3. The method according to claim 1, wherein the step b) comprises: step b3), the proxy mobile IP proxy network element queries the network access device for the network connection status of the mobile station;

Step b4), the proxy mobile IP proxy network element determines whether to release the mobile IP network resource related to the mobile station.

4. The method according to claim 1, wherein the network access device in the step a) detects the network connection status based on the 802. lx port access control status of the mobile station.

The method according to any one of claims 1 to 4, characterized in that in the step b), the proxy mobile IP proxy network element further notifies the mobile agent to release the mobile IP network resource associated with the mobile station.

A network access device for proxying mobile IP, comprising: detecting means: for detecting a network connection status of the accessed mobile station; and means for notifying the proxy mobile IP proxy network element The network connection status of the mobile station.

7. The network access device of claim 6, wherein the notification device is A notification message is sent to the proxy mobile IP proxy network element when the mobile station disconnects the network.

8. The network access device of claim 00, wherein the notification message is a Mobile IP Deregistration Request message.

9. The network access device of claim 6, wherein the notification device is responsive to an inquiry from a proxy mobile IP proxy network element to a network connection status of the mobile station.

10. The network access device of claim 9, wherein if the queried mobile station disconnects from the network, the notification device provides a mobile IP to register the response.

11. The network access device of claim 6, wherein the detecting device detects the network connection status based on the 802. l x port access control status of the mobile station.

12. A proxy mobile IP proxy network element device, comprising:

Interface device: a network connection status of a mobile station for obtaining its proxy; processing means: releasing the relevant mobile IP network resource for the mobile station after the mobile station network connection is disconnected.

13. The proxy mobile IP proxy network element device of claim 12, wherein the interface device receives a notification message from a network access device accessed by the mobile station for its network connection status.

14. The proxy mobile IP proxy network element device of claim 13 wherein the notification message is a Mobile IP Deregistration Request message.

15. The proxy mobile IP proxy network element device of claim 12, wherein the interface device queries a network access device accessed by the mobile station for its network connection status and receives a response message.

16. The proxy mobile IP proxy network element device of claim 15, wherein the response message is a mobile IP deregistration response message.

17. The proxy mobile IP proxy network element device of claim 12, wherein the interface device further notifies the mobile agent of the proxy mobile IP to release the mobile IP network resource associated with the mobile station.

18. A communication device for proxying mobile IP, comprising: detecting means: for detecting a network connection status of the accessed mobile station; proxy mobile IP proxy means: for using the mobile station network After the connection is disconnected, the mobile station releases its associated mobile IP network resources.

19. The communication device of claim 18, wherein said detecting means detects the network connection status based on the 802. lx port access control status of the mobile station.

20. The communication device of claim 18, wherein said proxy mobile IP proxy device notifies its mobile agent to release said mobile mobile site related proxy mobile IP network resources.