WO2011041976A1 - 缓存维护方法和系统以及接入服务节点 - Google Patents

缓存维护方法和系统以及接入服务节点 Download PDF

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Publication number
WO2011041976A1
WO2011041976A1 PCT/CN2010/077224 CN2010077224W WO2011041976A1 WO 2011041976 A1 WO2011041976 A1 WO 2011041976A1 CN 2010077224 W CN2010077224 W CN 2010077224W WO 2011041976 A1 WO2011041976 A1 WO 2011041976A1
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Prior art keywords
subscription
terminal
service node
access service
location information
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PCT/CN2010/077224
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English (en)
French (fr)
Inventor
汪军
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中兴通讯股份有限公司
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Publication of WO2011041976A1 publication Critical patent/WO2011041976A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements

Definitions

  • the present invention relates to the field of communications, and more particularly to a cache maintenance method and system and an access service node.
  • the Internet Engineering Task Force has proposed the technology of identity and location separation in recent years, with the identity location separation protocol (Locator).
  • the LISP protocol proposed by the Working Group and the Identifier Separation Protocol (LISP) is an example.
  • the Endpoint IDentifier (EID) of the terminal does not participate in the routing of the IP core network.
  • the backbone router can only see the interface routing address of the border access router. Routing LOCator, RLOC), and a border router can access a large number of terminals, and separately set a mapping plane storage terminal identity EID and router RLOC correspondence.
  • the packet destined for the terminal first needs to find its corresponding border router RLOC in the mapping plane, and then routes to the access router where the destination terminal is located according to the RLOC.
  • the schematic diagram is shown in Figure 1.
  • the Ingress Tunnel Router (ITR) and the Egress Tunnel Router (ETR) are the logical names of the access routers at both ends.
  • LISP can greatly reduce the node routing table capacity of the IP backbone router, but it leaves the complexity in the mapping plane.
  • the mapping plane stores all the EID-RLOC correspondences, and the access node (ITR) forwards the packets.
  • the access router caches the EID-RLOC correspondence and sets the domain name system (Domain Name System, DNS). ) Cache the same fixed cache timer, delete the cache after the timeout, or re-query the mapping server.
  • DNS Domain Name System
  • the technical problem to be solved by the present invention is to provide a cache maintenance method and system and an access service node to refresh the cache information in real time and improve the communication success rate.
  • the present invention provides a cache maintenance method, the method includes: a mapping plane establishes a subscription relationship to a terminal according to a subscription request of an access service node; and the mapping plane obtains a change in location information of the terminal. Location information of the terminal;
  • the mapping plane notifies the access service node of the changed location information of the terminal according to the subscription relationship, and the access service node refreshes the location information of the terminal in the local cache.
  • the step of the mapping plane establishing a subscription relationship to the terminal according to the subscription request of the access service node includes:
  • the access service node sends a subscription request for the independent or non-independent message to the mapping plane, where the subscription request carries the identity identifier of the terminal;
  • the mapping plane receives the subscription request, and establishes a subscription relationship of the access server node to the location information of the terminal according to the identity of the terminal.
  • the access service node In the step of the access service node sending a subscription request for the independent or non-independent message to the mapping plane, if the access service node receives the packet whose destination address is the identity of the terminal, and the local cache is not saved
  • the mapping relationship between the terminal identifier and the location information is implemented by the subscription parameter carried in the query request message or the packet forwarding request message sent by the access service node to the mapping plane.
  • the subscription request is carried by the query request sent by the access service node to the mapping plane: Subscription parameter implementation;
  • the mapping plane further includes: The mapping plane returns a query response message carrying the location information of the terminal, and the access service node records the identity and location information of the terminal in a local cache according to the query response message returned by the mapping plane. Mapping relations.
  • the change of the location information refers to the location information change caused by the handover of the terminal or the location caused by the terminal deregistration. Information is deleted.
  • the method further includes:
  • the mapping plane receives the subscription cancellation request sent by the access service node, where the subscription cancellation request carries the identity identifier of the terminal that has established the subscription relationship;
  • mapping plane deletes the subscription relationship of the access information service node to the location information of the terminal that has established the subscription relationship, and returns a cancel subscription success response to the access service node.
  • the present invention further provides an access service node, including: a transceiver module, configured to: send a subscription request to the mapping plane to the mapping plane, so that the mapping plane establishes a subscription relationship to the terminal, where The subscription request carries the identity identifier of the terminal that is directed to; and receives a subscription notification that is sent by the mapping plane according to the subscription relationship and carries the changed location information of the terminal;
  • a transceiver module configured to: send a subscription request to the mapping plane to the mapping plane, so that the mapping plane establishes a subscription relationship to the terminal, where The subscription request carries the identity identifier of the terminal that is directed to; and receives a subscription notification that is sent by the mapping plane according to the subscription relationship and carries the changed location information of the terminal;
  • a maintenance module configured to refresh location information of the terminal in the local cache according to the subscription notification.
  • the subscription request sent by the transceiver module to the mapping plane is an independent or non-independent subscription request.
  • the transceiver module is further configured to: send a subscription cancellation request to the mapping plane, where the subscription cancellation request carries an identity of the terminal that has established the subscription relationship, so that the mapping plane receives the subscription cancellation request and deletes the Determining, by the access service node, a subscription relationship of the location information of the terminal that has established the subscription relationship; and receiving an unsubscribe success response returned by the mapping plane.
  • the present invention further provides a cache maintenance system, where the system includes an access service node and a mapping plane connected through a network, where
  • the access service node is configured to send a subscription request to the mapping plane to the mapping plane; and receive a subscription notification sent by the mapping plane; and refresh the location information of the terminal in the local cache according to the subscription notification;
  • the subscription request carries the identity of the terminal that is pointed to, and the subscription notification carries the changed location information of the terminal;
  • the mapping plane is set to be established according to the subscription request sent by the access service node Pointing to a subscription relationship of the terminal, obtaining location information of the terminal that changes location information of the terminal, and sending, to the access service node, a location that carries the changed location information of the terminal according to the subscription relationship Subscribe to notifications.
  • the access service node includes a cache module, a transceiver module connected to the cache module, and a maintenance module connected to the cache module and the transceiver module, where the cache module is configured to cache the identity and location information of the terminal. a mapping relationship; the transceiver module is configured to send a subscription request to the mapping plane to the mapping plane, and receive a subscription notification sent by the mapping plane; and the maintenance module is configured to refresh the cache according to the subscription notification The mapping relationship of the corresponding terminal stored in the module;
  • the mapping plane includes a storage module and a subscription management module connected to the storage module, where the storage module is configured to store a mapping relationship between the identity identifier and the location information of the terminal, and store the identity identifier of the terminal and send a subscription request. a subscription relationship of the access service node; and the subscription management module is configured to receive the subscription request sent by the access service node, establish the subscription relationship directed to the terminal according to the subscription request, and The subscription relationship sends the subscription notification to the corresponding access service node to notify the access service node of the changed location information of the terminal.
  • the transceiver module of the access service node is further configured to: send a subscription cancellation request to the mapping plane, where the subscription cancellation request carries an identity of the terminal that has established the subscription relationship, and receives the return returned by the mapping plane. Unsubscribe successfully response;
  • the subscription management module of the mapping plane is configured to receive the subscription cancellation request and delete the subscription relationship of the access service node to the location information of the terminal that has established the subscription relationship.
  • the subscription request is an independent subscription request, or a subscription request implemented by a subscription parameter carried in a query request or a message forwarding request sent by the access service node to the mapping plane.
  • the change of the location information refers to the location information change caused by the handover of the terminal or the deletion of the location information caused by the terminal logout.
  • the access service node makes a subscription request to the mapping plane for the terminal.
  • the mapping relationship of the terminal changes, that is, when the location information of the terminal changes
  • the mapping plane notifies the latest mapping relationship or change in time.
  • the service node and the access service node perform real-time refreshing on the cache mapping relationship.
  • the access service node forwards the packet according to the mapping relationship that is refreshed in the local cache, the packet forwarding is correct, thereby improving communication. Success rate.
  • FIG. 1 is a schematic structural diagram of an existing identity location separation network
  • FIG. 2 is a schematic diagram of a cache maintenance method according to the present invention.
  • FIG. 3 is a schematic diagram of an application example of the present invention using an implicit subscription
  • FIG. 4 is a schematic diagram of an application example 2 for an explicit subscription according to the present invention.
  • FIG. 5 is a schematic diagram of application subscription three subscription cancellation according to the present invention.
  • FIG. 6 is another schematic diagram of a cache maintenance method according to the present invention.
  • FIG. 7 is a schematic structural diagram of a module of a cache maintenance system according to the present invention.
  • FIG. 8 is a schematic structural diagram of a module of an access service node according to the present invention.
  • FIG. 9 is a schematic structural diagram of another module of the cache maintenance system of the present invention.
  • the cache maintenance method and system of the present invention and the network implementation of the access service node based on the identity location separation architecture, and the access router (including the aforementioned ITR and ETR) for implementing terminal access are collectively referred to as an access service node (Access Service Node, ASN), a mapping server for registering, storing, and querying the mapping relationship between the identity and the location information in the core network is collectively referred to as a mapping plane, and the location information referred to in the present invention refers to a routing identifier that can be used for routing in the core network. Or location identifier.
  • the cache maintenance method and system of the present invention and the network implementation of the access service node based on the identity location separation architecture the main idea is that the access service node subscribes to the mapping plane for the mapping relationship between the identity and location information of the terminal that has been cached or about to be cached. Request, when the mapping relationship of the terminal is sent When the change occurs, that is, when the location information of the terminal changes, the mapping plane notifies the access service node of the latest mapping relationship or change in time, and the access service node refreshes the cache mapping relationship in real time to ensure the connection. The correctness of packet forwarding is performed at the serving node to improve the communication success rate.
  • the cache maintenance method of the present invention includes the following steps:
  • Step 201 a subscription relationship establishing step, the mapping plane establishing a subscription relationship directed to the specific terminal according to the subscription request of the access service node;
  • step 201 includes:
  • the access service node sends a subscription request for the independent or non-independent message to the mapping plane, the subscription request indicating the identity of the terminal;
  • the access service node determines, according to the external event, the location information change that needs to be subscribed to the user identity, and initiates a subscription request to the mapping plane, and the subscription keyword is the identity identifier of the subscribed user.
  • the subscription request may be identified by a parameter (i.e., a non-independent message) in one of the other messages, or a separate explicit subscription request may be sent.
  • the subscription request may be forwarded by the access service node to the access service node.
  • the subscription parameter carried in the query request or the packet forwarding request sent by the mapping plane is implemented.
  • the mapping plane receives the subscription request, and establishes a subscription relationship of the access server node to the location information of the terminal according to the identity of the terminal.
  • Step 202 Cache a real-time refreshing step, when the location information of the terminal changes, the mapping plane notifies the access service node according to the subscription relationship, and the access service node refreshes the location of the terminal in the local cache in real time. information.
  • Step 301 The terminal UE1 sends an IP packet, and the target address is the identity identifier EID2 of the peer UE2.
  • Step 302 After receiving the foregoing packet, the ASN1 finds that the location information corresponding to the EID2 is not in the local cache, and sends a query request message to the mapping plane, where the message carries a flag indicating that the EID2 route change request is subscribed, and the query is required. And the EID2 of the peer of the subscription;
  • the subscription request may also be implicitly carried by the message forwarding message.
  • Step 303 The mapping plane records that the ASN1 subscribes to the EID2 request, that is, establishes a subscription relationship, and the query obtains the location information corresponding to the EID2;
  • Step 304 The mapping plane returns location information corresponding to EID2 in the query response, and indicates that the subscription is successful.
  • ASN1 locally records the mapping relationship between EID2 and its corresponding location information according to the query response of the mapping plane.
  • Step 305 When the location information corresponding to the EID2 changes, for example, a handover or a logout occurs, the mapping plane obtains the route change information.
  • Step 306 The mapping plane notifies the ASN1 of the change information obtained in the foregoing step, where the EID2 and the change information are carried, and if the change brought by the handover, the new location information corresponding to the EID2 is carried; if the user logs off the event, the notification message is sent. Indicates that the user has logged out.
  • Step 307 The ASN1 refreshes the location information corresponding to the EID2 in the local cache in real time according to the notification sent by the mapping plane, that is, updates the mapping relationship of the peer end.
  • the application instance of the subscription request implemented by the independent subscription request message is shown in Figure 4.
  • the process of cache maintenance includes the following steps:
  • Step 401 The access service node determines a location change of the subscription identity identifier EID2 due to an event trigger.
  • Event triggering refers to querying the identity location or triggering a command.
  • Step 402 The access service node sends a subscription request message to the mapping plane, and the subscription request message carries at least the identity identifier EID of the subscribed terminal.
  • Step 403 The mapping plane records a route change event subscription relationship of the access service node to the subscribed terminal identity identifier.
  • Step 404 The mapping plane returns a subscription success response to the access service node, and the subscription is successful.
  • Step 405 The location information of the subscribed terminal EID is changed, such as moving to another access service node or canceling from the network, and the mapping plane obtains the information. (The mapping plane will be notified when the terminal route changes in the normal process);
  • Step 406 The mapping plane sends a subscription notification message to notify the access service node that the EID route subscribed to changes.
  • Step 407 The access service node receives the subscription notification message, and modifies the local cache according to the notification message.
  • the subscription request may further carry a parameter indicating a subscription period
  • the mapping plane may determine the timeliness of the subscription relationship according to the specific subscription policy, and the access service node does not re-initiate the subscription request for the same EID in the subscription period. Then the subscription relationship is invalid when the time of the subscription period is reached.
  • ASN1 points to a terminal to initiate a subscription request.
  • a subscription request directed to multiple or a group of terminals may be sent at a time, and the request should indicate the terminal information pointed to by the subscription, so as to establish a mapping relationship for the mapping plane.
  • FIG. 5 illustrates the unsubscribe implementation of the present invention, including the following steps:
  • Step 501 The access service node is triggered by some event (such as the EID has no active connection in the access service node) to cancel the subscription of the route change of the user EID2;
  • Step 502 the access service node sends a subscription cancellation request to the mapping plane, where the request carries at least the identity identifier EID2 of the subscribed user;
  • Step 503 After receiving the subscription cancellation request for the identity identifier EID2, the mapping plane deletes the subscription relationship of the access service node to the EID2 route change.
  • Step 504 The mapping plane returns an unsubscribing success response to the access service node.
  • FIG. 6 is another schematic diagram of a cache maintenance method according to the present invention. As shown in FIG. 6, the method includes the following steps: Step 601: The mapping plane establishes a subscription relationship to the terminal according to the subscription request of the access service node.
  • Step 602 The mapping plane obtains location information of the terminal that changes location information of the terminal.
  • Step 603 The mapping plane notifies the access service node of the obtained location information of the terminal according to the subscription relationship, and the access service node refreshes location information of the terminal in the local cache.
  • the present invention further provides a cache maintenance system.
  • the system includes an access service node 710 and a mapping plane 720 connected through a network, where
  • the access service node 710 is configured to send, to the mapping plane 720, a subscription request directed to a specific terminal, and perform real-time refreshing of the locally cached terminal location information according to the subscription notification sent by the mapping plane 720;
  • the access service node 710 includes a cache module 711 and a cache maintenance module 712 connected to the cache module 711.
  • the cache module 711 is configured to store a mapping relationship between the identity of the terminal and the location information.
  • the cache maintenance module 712 is configured to send a subscription request to the mapping plane 720 to the specific terminal, where the subscription request carries the pointed terminal.
  • the identifier is further configured to receive the subscription notification sent by the mapping plane 720, and refresh the mapping relationship of the corresponding terminal according to the subscription notification; and is further configured to send a subscription cancellation request to the mapping plane 720, where the terminal that is pointed to is carried Identity.
  • the subscription request of the present invention is an independent subscription request message, or the access service node 710 queries the mapping plane 720 for the subscription parameter carried by the request message or the message forwarding request message.
  • the access service node 710 should also include the function modules related to the access forwarding process in order to implement the complete access forwarding function, and details are not described herein again.
  • the mapping plane 720 is configured to establish a subscription relationship according to the subscription request sent by the access service node 710, and send a subscription notification to the access service node 710 according to the subscription relationship when the terminal location information changes.
  • the mapping plane 720 includes a storage module 721 and a subscription management module 722 connected to the storage module 721, where
  • the storage module 721 is configured to store a mapping relationship between the identity of the terminal and the location information, and a subscription relationship between the identity of the terminal and the access service node 710 that sends the subscription request.
  • the subscription management module 722 is configured to receive the subscription request sent by the access service node 710, and establish the subscription relationship according to the subscription request, and is further configured to use, according to the subscription relationship, when the location information of the terminal is changed.
  • the corresponding access service node 710 sends a subscription notification, which carries the change information of the terminal, and is further configured to receive the subscription cancellation request and delete the corresponding subscription relationship.
  • the subscription management module 722 of the mapping plane 720 is further configured to send a subscription request response to the access service node 710 according to whether the subscription relationship is successfully established, and to successfully access the access service according to the subscription relationship. Node 710 sends a subscription cancellation request response.
  • the mapping plane 720 may be implemented by one or more mapping servers in a specific implementation, and may be divided into specific functions according to the identity location separation architecture network.
  • the mapping plane 720 may also include function modules related to text processing and mapping relationship maintenance. Let me repeat.
  • FIG. 8 is a schematic structural diagram of a module of an access service node according to the present invention.
  • the access service node 800 includes: a transceiver module 810, configured to: send a subscription request to the mapping plane to the mapping plane, so that the mapping plane establishes a subscription relationship to the terminal, where the subscription request carries Pointing the identity of the terminal; and receiving a subscription notification sent by the mapping plane according to the subscription relationship, carrying the changed location information of the terminal; and a maintenance module 820 configured to refresh according to the subscription notification Location information of the terminal in the local cache.
  • the subscription request sent by the transceiver module 810 to the mapping plane is an independent or non-independent subscription request.
  • the transceiver module in the access service node 800 may also be configured to: The mapping plane sends a subscription cancellation request, where the subscription cancellation request carries the identity of the terminal that has established the subscription relationship, so that the mapping plane receives the subscription cancellation request and deletes the access service node 800 to the established Subscribing to the subscription relationship of the location information of the terminal of the relationship; and receiving the unsubscribe success response returned by the mapping plane.
  • FIG. 9 is a schematic structural diagram of another module of the cache maintenance system of the present invention.
  • the system includes an access service node 910 and a mapping plane 920 that are connected by a network.
  • the access service node 910 is configured to send a subscription request to the mapping plane 920 to the terminal; and receive a subscription notification sent by the mapping plane 920; and refresh the terminal in the local cache according to the subscription notification Location information:
  • the subscription request carries the identity of the terminal that is pointed to, and the subscription notification carries the changed location information of the terminal.
  • the mapping plane 920 is configured to establish a subscription relationship to the terminal according to the subscription request sent by the access service node 910, and obtain location information of the terminal where the location information of the terminal changes, and according to The subscription relationship sends the subscription notification to the access service node 91 that carries the changed location information of the terminal.
  • the access service node 910 and the mapping plane 920 in the cache maintenance system can also be embodied as:
  • the access service node 910 includes a cache module 911, a transceiver module 912 connected to the cache module 911, and a maintenance module 913 connected to the cache module 911 and the transceiver module 912.
  • the cache module 911 is configured to be cached. a mapping relationship between the identity of the terminal and the location information; the transceiver module 912 is configured to send a subscription request to the mapping plane 920 to the terminal, and receive a subscription notification sent by the mapping plane 920; and the maintenance module
  • the 913 is configured to refresh the mapping relationship of the corresponding terminal stored in the cache module 911 according to the subscription notification.
  • the mapping plane 920 includes a storage module 921 and a subscription management module 922 connected to the storage module 921, where
  • the storage module 921 is configured to store a mapping relationship between the identity of the terminal and the location information, and store a subscription relationship between the identity of the terminal and the access service node 910 that sends the subscription request; and the subscription management module 922 is configured to receive the Accessing the subscription request sent by the service node 910, root
  • the subscription request establishes the subscription relationship to the terminal, and sends the subscription notification to the corresponding access service node 910 according to the subscription relationship to notify the access location information of the changed terminal.
  • the transceiver module 912 of the access service node 910 is further configured to: The 920 sends a subscription cancellation request, where the subscription cancellation request carries the identity of the terminal that has established the subscription relationship, and receives the unsubscribe success response returned by the mapping plane 920.
  • the subscription management module 922 of the mapping plane 920 is configured to receive the subscription cancellation request and delete the subscription relationship of the access service node 910 to the location information of the terminal that has established the subscription relationship.
  • the subscription request is an independent subscription request, or is through the access service node.
  • the change of the location information refers to the location information change caused by the handover of the terminal or the deletion of the location information caused by the terminal logout.
  • the cache maintenance method and system of the present invention and the access service node are implemented based on the network of the identity location separation architecture, and the access service node makes a subscription request to the mapping plane for the terminal, and when the mapping relationship of the terminal changes, that is, the location information of the terminal When the change occurs, the mapping plane notifies the access node to the latest mapping relationship or change in time, and the access service node refreshes the cache mapping relationship in real time according to the mapping relationship in real time refreshed by the access service node according to the local cache.
  • packet forwarding is performed, the correctness of packet forwarding can be ensured, thereby improving the communication success rate.
  • the cache maintenance method and system of the present invention and the access service node are implemented based on the network of the identity location separation architecture, and the access service node makes a subscription request to the mapping plane for the terminal, and when the mapping relationship of the terminal changes, that is, the location information of the terminal When the change occurs, the mapping plane notifies the access node to the latest mapping relationship or change in time, and the access service node refreshes the cache mapping relationship in real time according to the mapping relationship in real time refreshed by the access service node according to the local cache.
  • packet forwarding is performed, the correctness of packet forwarding can be ensured, thereby improving the communication success rate.

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Abstract

本发明公开了缓存维护方法和系统以及接入服务节点，其中所述方法包括：映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系；映射平面获得终端的位置信息发生变化的终端的位置信息；映射平面根据订阅关系将变化的终端的位置信息通知接入服务节点，接入服务节点刷新本地缓存中终端的位置信息。本发明基于身份位置分离架构的网络实现，当终端的映射关系发生变化时，也即终端的位置信息发生变化时，映射平面及时将最新的映射关系或变化情况通知接入服务节点，接入服务节点据此对缓存的映射关系进行实时刷新，当接入服务节点根据本地缓存中实时刷新的映射关系进行报文转发时即可以保证报文转发的正确性，从而提高通信成功率。

Description

緩存维护方法和系统以及接入服务节点
技术领域
本发明涉及通信领域， 尤其是一种緩存维护方法和系统以及接入服务节 点。
背景技术
为了解决互联网核心路由器节点路由表容量快速膨胀以及 IP地址二义性 的问题， 互联网工程任务组（Internet Engineering Task Force, IETF )近年来 提出了身份与位置分离的技术， 以身份位置分离协议（Locator and Identifier Separation Protocol , LISP )工作组提出的 LISP协议为例， 其终端的身份标识 ( Endpoint IDentifier, EID ) 不参与 IP核心网的路由， 骨干路由器只能看到 边界接入路由器的接口路由地址（Routing LOCator, RLOC ) , 而一个边界路 由器可以接入大量的终端， 单独设置一个映射平面存储终端身份 EID和路由 器 RLOC的对应关系。 发往终端的报文首先需要在映射平面中查找到其对应 的边界路由器 RLOC, 然后根据 RLOC路由到目的终端所在接入路由器。 其 示意图见图 1 , 其中入口隧道路由器（ Ingress Tunnel Router, ITR )和出口隧 道路由器（Egress Tunnel Router, ETR )是收发两端接入路由器的逻辑名称。
LISP可以大大缩减 IP骨干网路由器的节点路由表容量，但是其将复杂性 留在了映射平面， 映射平面要存储所有的 EID-RLOC的对应关系， 同时接入 节点 （ITR )在报文转发时要向映射平面查询目标 EID-RLOC 的对应关系， 在现有的系统中为了緩解映射平面的压力， 接入路由器对 EID-RLOC的对应 关系进行緩存， 并且设置与域名系统（Domain Name System, DNS )緩存相 同的固定緩存定时器的方式， 緩存超时后删除緩存或重新查询映射服务器。 该机制在固网环境下运转良好， 但是在移动网环境下， 用户是移动的， 在 EID-RLOC緩存定时器生效期间， 如果用户发生移动， 则报文将发往错误的 目标地址， 由于用户移动行为的不可预知性， 该机制将严重影响用户的通信 体验。 发明内容
本发明要解决的技术问题是提供一种緩存维护方法和系统以及接入服务 节点， 以对緩存信息实时刷新， 提高通信成功率。
为解决以上技术问题本发明提供了一种緩存维护方法， 该方法包括： 映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系； 所述映射平面获得所述终端的位置信息发生变化的所述终端的位置信 息；
所述映射平面根据所述订阅关系将变化的所述终端的位置信息通知所述 接入服务节点， 所述接入服务节点刷新本地緩存中所述终端的位置信息。
所述映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系的 步骤包括：
所述接入服务节点向所述映射平面发送独立或非独立消息的订阅请求， 所述订阅请求中携带所述终端的身份标识；
所述映射平面接收所述订阅请求， 并根据所述终端的身份标识建立所述 接入服务器节点对所述终端的位置信息的订阅关系。
所述接入服务节点向所述映射平面发送独立或非独立消息的订阅请求的 步骤中， 若所述接入服务节点接收到目的地址为所述终端身份标识的报文， 且本地緩存未保存所述终端身份标识与位置信息的映射关系， 则所述订阅请 求通过在所述接入服务节点向所述映射平面发送的查询请求消息或报文转发 请求消息中携带的订阅参数实现。
所述映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系的 步骤中， 所述订阅请求通过在所述接入服务节点向所述映射平面发送的查询 请求： i %息中携带的订阅参数实现；
在所述映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系 的步骤之后， 所述映射平面获得所述终端的位置信息发生变化的所述终端的 位置信息的步骤之前， 还包括： 所述映射平面返回携带所述终端的位置信息 的查询响应消息， 所述接入服务节点根据所述映射平面返回的所述查询响应 消息在本地緩存中记录所述终端的身份标识与位置信息的映射关系。 所述映射平面获得所述终端的位置信息发生变化的所述终端的位置信息 的步骤中， 所述位置信息发生变化是指所述终端发生切换引起的位置信息改 变或所述终端注销引起的位置信息删除。
所述方法还包括：
所述映射平面接收所述接入服务节点发送的订阅取消请求， 所述订阅取 消请求中携带已建立订阅关系的终端的身份标识；
所述映射平面删除所述接入 Λ良务节点对所述已建立订阅关系的终端的位 置信息的订阅关系， 并返回取消订阅成功响应至所述接入服务节点。
为解决以上技术问题， 本发明还提供了一种接入服务节点， 包括： 收发模块， 其设置为： 向映射平面发送指向终端的订阅请求以使所述映 射平面建立指向终端的订阅关系， 所述订阅请求中携带指向的所述终端的身 份标识； 并且接收所述映射平面根据所述订阅关系发送的、 携带变化的所述 终端的位置信息的订阅通知； 以及
维护模块， 其设置为根据所述订阅通知刷新本地緩存中的所述终端的位 置信息。
其中， 所述收发模块向映射平面发送的订阅请求是独立或非独立的订阅 请求。
所述收发模块还设置为： 向所述映射平面发送订阅取消请求， 所述订阅 取消请求中携带已建立订阅关系的终端的身份标识， 以使所述映射平面接收 所述订阅取消请求并删除所述接入服务节点对所述已建立订阅关系的终端的 位置信息的订阅关系； 并且接收所述映射平面返回的取消订阅成功响应。
为解决以上技术问题， 本发明还提供了一种緩存维护系统， 该系统包括 通过网络连接的接入服务节点和映射平面， 其中，
所述接入服务节点， 设置为向所述映射平面发送指向终端的订阅请求； 并且接收所述映射平面发送的订阅通知； 以及根据所述订阅通知刷新本地緩 存中的所述终端的位置信息； 所述订阅请求中携带指向的所述终端的身份标 识， 所述订阅通知中携带变化的所述终端的位置信息； 以及
所述映射平面， 设置为根据所述接入服务节点发送的所述订阅请求建立 指向所述终端的订阅关系， 获得所述终端的位置信息发生变化的所述终端的 位置信息， 并且根据所述订阅关系向所述接入服务节点发送携带变化的所述 终端的位置信息的所述订阅通知。
所述接入服务节点包括緩存模块、 与所述緩存模块连接的收发模块以及 与所述緩存模块和收发模块连接的维护模块， 其中， 所述緩存模块设置为緩 存终端的身份标识与位置信息的映射关系； 所述收发模块设置为向所述映射 平面发送指向所述终端的订阅请求，并且接收所述映射平面发送的订阅通知； 以及所述维护模块设置为根据所述订阅通知刷新所述緩存模块中存储的对应 终端的映射关系；
所述映射平面包括存储模块以及与所述存储模块连接的订阅管理模块， 其中， 所述存储模块设置为存储终端的身份标识与位置信息的映射关系， 存 储所述终端的身份标识与发送订阅请求的接入服务节点的订阅关系； 以及所 述订阅管理模块设置为接收所述接入服务节点发送的所述订阅请求， 根据所 述订阅请求建立指向所述终端的所述订阅关系， 并且根据所述订阅关系向对 应的接入服务节点发送所述订阅通知以将变化的所述终端的位置信息通知所 述接入服务节点。
所述接入服务节点的所述收发模块还设置为： 向所述映射平面发送订阅 取消请求， 所述订阅取消请求中携带已建立订阅关系的终端的身份标识， 并 且接收所述映射平面返回的取消订阅成功响应；
所述映射平面的订阅管理模块设置为接收所述订阅取消请求并删除所述 接入服务节点对所述已建立订阅关系的终端的位置信息的订阅关系。
所述订阅请求是独立的订阅请求， 或是通过在所述接入服务节点向所述 映射平面发送的查询请求或报文转发请求中携带的订阅参数实现的订阅请 求。
所述位置信息发生变化是指所述终端发生切换引起的位置信息改变或所 述终端注销引起的位置信息删除。
本发明緩存维护方法和系统以及接入服务节点， 基于身份位置分离架构 的网络实现， 接入服务节点针对终端向映射平面提出订阅请求， 当终端的映 射关系发生变化时， 也即终端的位置信息发生变化时， 映射平面及时将最新 的映射关系或变化情况通知接入服务节点， 接入服务节点据此对緩存的映射 关系进行实时刷新， 当接入服务节点根据本地緩存中实时刷新的映射关系进 行报文转发时即可以保证报文转发的正确性， 从而提高通信成功率。
附图概述
图 1为现有身份位置分离网络的架构示意图；
图 2为本发明緩存维护方法的示意图；
图 3为本发明应用实例一釆用隐含订阅的示意图；
图 4为本发明应用实例二釆用显式订阅的示意图；
图 5为本发明应用实例三订阅取消的示意图；
图 6为本发明緩存维护方法的另一示意图；
图 7为本发明緩存维护系统的模块结构示意图；
图 8为本发明接入服务节点的模块结构示意图；
图 9为本发明緩存维护系统的另一模块结构示意图。
本发明的较佳实施方式
本发明緩存维护方法和系统以及接入服务节点基于身份位置分离架构的 网络实现， 并将实现终端接入的接入路由器（包括前述的 ITR和 ETR )统称 为接入服务节点 （ Access Service Node , ASN ) , 将核心网中实现身份标识 与位置信息的映射关系的注册、保存及查询的映射服务器等统称为映射平面， 本发明所说的位置信息指可以在核心网中用于路由的路由标识或位置标识。
本发明緩存维护方法和系统以及接入服务节点基于身份位置分离架构的 网络实现， 主要思想是接入服务节点针对已经緩存或即将緩存的终端的身份 标识和位置信息的映射关系向映射平面提出订阅请求， 当终端的映射关系发 生变化时， 也即终端的位置信息发生变化时， 映射平面及时将最新的映射关 系或变化情况通知接入服务节点， 接入服务节点据此对緩存的映射关系进行 实时刷新， 以保证通过接入服务节点进行报文转发的正确性， 提高通信成功 率。
如图 2所示， 本发明緩存维护方法包括以下步骤：
步骤 201 : 订阅关系建立步骤， 映射平面根据接入服务节点的订阅请求 建立指向特定终端的订阅关系；
具体地， 步骤 201包括：
( a )接入服务节点向映射平面发送独立或非独立消息的订阅请求， 所述 订阅请求指明所述终端的身份标识；
接入服务节点根据外部事件触发决定需要订阅用户身份标识的位置信息 变化情况， 其向映射平面发起一个订阅请求， 订阅关键字为被订阅用户的身 份标识。 所述订阅请求可以在一个其他消息中釆用一个参数进行标识（即非 独立消息） ， 也可以发送一个独立的显式订阅请求。
当接入服务节点接收到目的地址为所述终端身份标识的报文， 且本地緩 存未保存所述终端身份标识与位置信息的映射关系时， 所述订阅请求可以通 过所述接入服务节点向所述映射平面发送的查询请求或报文转发请求中携带 的订阅参数实现。
( b )映射平面接收所述订阅请求， 并根据所述终端的身份标识建立所述 接入服务器节点对所述终端的位置信息的订阅关系。
步骤 202: 緩存实时刷新步骤， 所述终端的位置信息变化时， 所述映射 平面根据所述订阅关系通知所述接入服务节点， 所述接入服务节点实时刷新 本地緩存中所述终端的位置信息。
以下结合附图对本发明緩存维护方法进行具体说明：
应用实例一： 隐含订阅方式
订阅请求以查询请求消息隐含实现的应用实例如图 3所示， 緩存维护的 流程包括以下步骤： 步骤 301 : 终端 UE1发送一个 IP报文， 目标地址为对端 UE2的身份标 识 EID2;
步骤 302: ASN1收到前述报文后， 发现在本地緩存中没有该 EID2对应 的位置信息， 向映射平面发起一个查询请求消息， 该消息中携带表示订阅该 EID2路由变化请求的标志 , 以及要查询及订阅的对端的 EID2;
对于首报转发的实现方式而言， 订阅请求也可以通过报文转发消息隐含 携带。
步骤 303:映射平面记录下 ASN1订阅 EID2的请求，也即建立订阅关系， 查询获得 EID2对应的位置信息；
步骤 304: 映射平面在查询响应中返回 EID2对应的位置信息， 并指示订 阅成功；
ASN1根据映射平面的查询响应在本地緩存记录 EID2及其对应的位置信 息的映射关系。
步骤 305:所述 EID2对应的位置信息发生变化时，比如发生切换或注销， 映射平面获得该路由变化信息；
步骤 306: 映射平面将前述步骤获得的变化信息通知 ASN1 , 其中携带 EID2和变化信息， 如是切换带来的变化， 则携带所述 EID2对应的新的位置 信息； 如是用户注销事件， 则通知消息中表明该用户已注销。
步骤 307: ASN1根据映射平面发送的通知实时刷新本地緩存中 EID2对 应的位置信息， 也即更新对端的映射关系。
应用实例二： 显式订阅方式
订阅请求以独立的订阅请求消息实现的应用实例如图 4所示， 緩存维护 的流程包括以下步骤：
步骤 401 :接入服务节点由于事件触发决定订阅身份标识 EID2的位置变 化情况；
事件触发指查询身份标识位置之后或命令触发。 步骤 402: 所述接入服务节点向映射平面发送一个订阅请求消息， 订阅 请求消息中至少携带被订阅终端的身份标识 EID；
步骤 403: 所述映射平面记录下接入服务节点对被订阅终端身份标识的 路由变化事件订阅关系；
步骤 404: 映射平面向接入服务节点返回订阅成功响应， 订阅成功； 步骤 405: 被订阅终端 EID的位置信息发生改变， 如移动到其它接入服 务节点或从网络中注销， 映射平面获得该信息 (正常流程中终端路由发生变化 均会通知映射平面）；
步骤 406: 映射平面发送一条订阅通知消息通知接入服务节点所订阅的 EID路由发生变化。
步骤 407: 接入服务节点收到订阅通知消息， 根据通知消息修改本地的 緩存。
根据具体的订阅策略，所述订阅请求中还可以携带表示订阅周期的参数， 映射平面可据此确定订阅关系的时效性， 在订阅周期内接入服务节点没有重 新发起对同一 EID的订阅请求，则当到达订阅周期的时间时该订阅关系失效。
以上是以 ASN1指向一个终端发起订阅请求为例进行说明的， 当然也可 以一次发送指向多个或一组终端的订阅请求， 该请求应该指明订阅所指向的 终端信息， 以便于映射平面建立映射关系。
应用实例三： 取消订阅
图 5示出了本发明的取消订阅实现方式， 包括以下步骤：
步骤 501 , 接入服务节点由于某种事件触发 (如该 EID在本接入服务节点 中已无活动连接)决定取消对用户 EID2的路由变化情况的订阅；
步骤 502, 所述接入服务节点向映射平面发送一个订阅取消请求， 所述 请求中至少携带被订阅用户的身份标识 EID2；
步骤 503 , 映射平面收到对身份标识 EID2的订阅取消请求后， 删除所述 接入服务节点对 EID2路由变化的订阅关系； 步骤 504, 映射平面向接入服务节点返回取消订阅成功响应。
图 6为本发明緩存维护方法的另一示意图。 如图 6所示， 包括如下步骤： 步骤 601、 映射平面根据接入服务节点的订阅请求建立指向终端的订阅 关系；
步骤 602、 所述映射平面获得所述终端的位置信息发生变化的所述终端 的位置信息；
步骤 603、 所述映射平面根据所述订阅关系将获得的所述终端的位置信 息通知所述接入服务节点， 所述接入服务节点刷新本地緩存中所述终端的位 置信息。
为实现以上方法， 本发明还提供了一种緩存维护系统， 如图 7所示， 该 系统包括通过网络连接的接入服务节点 710和映射平面 720, 其中，
所述接入服务节点 710用于向所述映射平面 720发送指向特定终端的订 阅请求， 以及根据所述映射平面 720发送的订阅通知对本地緩存的终端位置 信息进行实时刷新；
具体地， 所述接入服务节点 710包括緩存模块 711以及与所述緩存模块 711连接的緩存维护模块 712,
所述緩存模块 711用于存储终端的身份标识与位置信息的映射关系； 所述緩存维护模块 712用于向所述映射平面 720发送指向特定终端的订 阅请求， 所述订阅请求中携带指向的终端的身份标识； 还用于接收所述映射 平面 720发送的订阅通知，以及根据所述订阅通知刷新对应终端的映射关系； 还用于向所述映射平面 720发送订阅取消请求， 其中携带指向的终端的身份 标识。
本发明所说的订阅请求是独立的订阅请求消息， 或是， 所述接入服务节 点 710向所述映射平面 720查询请求消息或报文转发请求消息携带的订阅参 数实现。 当然， 接入服务节点 710为了实现完整的接入转发功能， 还应该包括接 入转发处理相关的功能模块， 在此不再赘述。
所述映射平面 720, 用于根据所述接入服务节点 710发送的订阅请求建 立订阅关系， 以及在终端位置信息变化时根据所述订阅关系向所述接入服务 节点 710发送订阅通知。
具体地， 所述映射平面 720包括存储模块 721及与所述存储模块 721连 接的订阅管理模块 722, 其中，
存储模块 721 , 用于存储终端的身份标识与位置信息的映射关系， 以及 所述终端的身份标识与发送订阅请求的接入服务节点 710的订阅关系；
订阅管理模块 722, 用于接收所述接入服务节点 710发送的订阅请求并 根据所述订阅请求建立所述订阅关系， 还用于在所述终端的位置信息发送变 化时根据所述订阅关系向对应的接入服务节点 710发送订阅通知， 其中携带 所述终端的变化信息；还用于接收所述订阅取消请求并删除对应的订阅关系。
另外， 所述映射平面 720的订阅管理模块 722还用于根据所述订阅关系 建立成功与否向所述接入服务节点 710发送订阅请求响应以及根据订阅关系 删除成功与否向所述接入服务节点 710发送订阅取消请求响应。
所述映射平面 720在具体实现时可以由一个或多个映射服务器实现， 根 据身份位置分离架构网络的具体功能划分， 映射平面 720还可能包括 文处 理及映射关系维护相关的功能模块， 在此不再赘述。
图 8为本发明接入服务节点的模块结构示意图。 如图 8所示， 该接入服 务节点 800 包括： 收发模块 810, 其设置为： 向映射平面发送指向终端的订 阅请求以使所述映射平面建立指向终端的订阅关系， 所述订阅请求中携带指 向的所述终端的身份标识；并且接收所述映射平面根据所述订阅关系发送的、 携带变化的所述终端的位置信息的订阅通知； 以及维护模块 820, 其设置为 根据所述订阅通知刷新本地緩存中的所述终端的位置信息。 其中， 所述收发 模块 810向映射平面发送的订阅请求是独立或非独立的订阅请求。
另外， 在该接入服务节点 800中的所述收发模块还可以设置为： 向所述 映射平面发送订阅取消请求， 所述订阅取消请求中携带已建立订阅关系的终 端的身份标识， 以使所述映射平面接收所述订阅取消请求并删除所述接入服 务节点 800对所述已建立订阅关系的终端的位置信息的订阅关系； 并且接收 所述映射平面返回的取消订阅成功响应。
图 9为本发明緩存维护系统的另一模块结构示意图。 该系统包括通过网 络连接的接入服务节点 910和映射平面 920。 所述接入服务节点 910, 设置为 向所述映射平面 920发送指向终端的订阅请求； 并且接收所述映射平面 920 发送的订阅通知； 以及根据所述订阅通知刷新本地緩存中的所述终端的位置 信息； 所述订阅请求中携带指向的所述终端的身份标识， 所述订阅通知中携 带变化的所述终端的位置信息。 所述映射平面 920, 设置为根据所述接入服 务节点 910发送的所述订阅请求建立指向所述终端的订阅关系， 获得所述终 端的位置信息发生变化的所述终端的位置信息， 并且根据所述订阅关系向所 述接入服务节点 91发送携带变化的所述终端的位置信息的所述订阅通知。
在该实施例中， 緩存维护系统中的接入服务节点 910和映射平面 920还 可以分别具体化为：
所述接入服务节点 910包括緩存模块 911、 与所述緩存模块 911连接的 收发模块 912以及与所述緩存模块 911和收发模块 912连接的维护模块 913 , 其中，所述緩存模块 911设置为緩存终端的身份标识与位置信息的映射关系； 所述收发模块 912设置为向所述映射平面 920发送指向所述终端的订阅请求 , 并且接收所述映射平面 920发送的订阅通知； 以及所述维护模块 913设置为 根据所述订阅通知刷新所述緩存模块 911中存储的对应终端的映射关系； 所述映射平面 920包括存储模块 921 以及与所述存储模块 921连接的订 阅管理模块 922, 其中， 所述存储模块 921设置为存储终端的身份标识与位 置信息的映射关系， 存储所述终端的身份标识与发送订阅请求的接入服务节 点 910的订阅关系； 以及所述订阅管理模块 922设置为接收所述接入服务节 点 910发送的所述订阅请求， 根据所述订阅请求建立指向所述终端的所述订 阅关系， 并且根据所述订阅关系向对应的接入服务节点 910发送所述订阅通 知以将变化的所述终端的位置信息通知所述接入 Λ良务节点 910。
所述接入服务节点 910的所述收发模块 912还设置为： 向所述映射平面 920发送订阅取消请求， 所述订阅取消请求中携带已建立订阅关系的终端的 身份标识， 并且接收所述映射平面 920返回的取消订阅成功响应。 所述映射 平面 920的订阅管理模块 922设置为接收所述订阅取消请求并删除所述接入 服务节点 910对所述已建立订阅关系的终端的位置信息的订阅关系。
其中， 所述订阅请求是独立的订阅请求， 或是通过在所述接入服务节点
910向所述映射平面 920发送的查询请求或报文转发请求中携带的订阅参数 实现的订阅请求。 所述位置信息发生变化是指所述终端发生切换引起的位置 信息改变或所述终端注销引起的位置信息删除。
本发明緩存维护方法和系统以及接入服务节点， 基于身份位置分离架构 的网络实现， 接入服务节点针对终端向映射平面提出订阅请求， 当终端的映 射关系发生变化时， 也即终端的位置信息发生变化时， 映射平面及时将最新 的映射关系或变化情况通知接入服务节点， 接入服务节点据此对緩存的映射 关系进行实时刷新， 当接入服务节点根据本地緩存中实时刷新的映射关系进 行报文转发时即可以保证报文转发的正确性， 从而提高通信成功率。
工业实用性
本发明緩存维护方法和系统以及接入服务节点， 基于身份位置分离架构 的网络实现， 接入服务节点针对终端向映射平面提出订阅请求， 当终端的映 射关系发生变化时， 也即终端的位置信息发生变化时， 映射平面及时将最新 的映射关系或变化情况通知接入服务节点， 接入服务节点据此对緩存的映射 关系进行实时刷新， 当接入服务节点根据本地緩存中实时刷新的映射关系进 行报文转发时即可以保证报文转发的正确性， 从而提高通信成功率。

Claims

权 利 要 求 书
1、 一种緩存维护方法， 包括：
映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系； 所述映射平面获得所述终端的位置信息发生变化的所述终端的位置信 息；
所述映射平面根据所述订阅关系将变化的所述终端的位置信息通知所述 接入服务节点， 所述接入服务节点刷新本地緩存中所述终端的位置信息。
2、 如权利要求 1所述的方法， 其中， 所述映射平面根据接入服务节点的 订阅请求建立指向终端的订阅关系的步骤包括：
所述接入服务节点向所述映射平面发送独立或非独立消息的订阅请求， 所述订阅请求中携带所述终端的身份标识；
所述映射平面接收所述订阅请求， 并根据所述终端的身份标识建立所述 接入服务器节点对所述终端的位置信息的订阅关系。
3、 如权利要求 2所述的方法， 其中： 所述接入服务节点向所述映射平面 发送独立或非独立消息的订阅请求的步骤中， 若所述接入服务节点接收到目 的地址为所述终端身份标识的报文， 且本地緩存未保存所述终端身份标识与 位置信息的映射关系， 则所述订阅请求通过在所述接入服务节点向所述映射 平面发送的查询请求消息或 文转发请求消息中携带的订阅参数实现。
4、 如权利要求 1所述的方法， 其中：
所述映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系的 步骤中， 所述订阅请求通过在所述接入服务节点向所述映射平面发送的查询 请求： i %息中携带的订阅参数实现；
在所述映射平面根据接入服务节点的订阅请求建立指向终端的订阅关系 的步骤之后， 所述映射平面获得所述终端的位置信息发生变化的所述终端的 位置信息的步骤之前， 还包括： 所述映射平面返回携带所述终端的位置信息 的查询响应消息， 所述接入服务节点根据所述映射平面返回的所述查询响应 消息在本地緩存中记录所述终端的身份标识与位置信息的映射关系。
5、 如权利要求 1至 4中任一项所述的方法， 其中： 所述映射平面获得所 述终端的位置信息发生变化的所述终端的位置信息的步骤中， 所述位置信息 发生变化是指所述终端发生切换引起的位置信息改变或所述终端注销引起的 位置信息删除。
6、 如权利要求 1所述的方法， 所述方法还包括：
所述映射平面接收所述接入服务节点发送的订阅取消请求， 所述订阅取 消请求中携带已建立订阅关系的终端的身份标识；
所述映射平面删除所述接入 Λ良务节点对所述已建立订阅关系的终端的位 置信息的订阅关系， 并返回取消订阅成功响应至所述接入服务节点。
7、 一种接入服务节点， 包括：
收发模块， 其设置为： 向映射平面发送指向终端的订阅请求以使所述映 射平面建立指向终端的订阅关系， 所述订阅请求中携带指向的所述终端的身 份标识； 并且接收所述映射平面根据所述订阅关系发送的、 携带变化的所述 终端的位置信息的订阅通知； 以及
维护模块， 其设置为根据所述订阅通知刷新本地緩存中的所述终端的位 置信息。
8、 如权利要求 7所述的接入服务节点， 其中， 所述收发模块向映射平面 发送的订阅请求是独立或非独立的订阅请求。
9、 如权利要求 7所述的接入服务节点， 其中， 所述收发模块还设置为： 向所述映射平面发送订阅取消请求， 所述订阅取消请求中携带已建立订阅关 系的终端的身份标识， 以使所述映射平面接收所述订阅取消请求并删除所述 接入服务节点对所述已建立订阅关系的终端的位置信息的订阅关系； 并且接 收所述映射平面返回的取消订阅成功响应。
10、 一种緩存维护系统， 该系统包括通过网络连接的接入服务节点和映 射平面， 其中，
所述接入服务节点， 设置为向所述映射平面发送指向终端的订阅请求； 并且接收所述映射平面发送的订阅通知； 以及根据所述订阅通知刷新本地緩 存中的所述终端的位置信息； 所述订阅请求中携带指向的所述终端的身份标 识， 所述订阅通知中携带变化的所述终端的位置信息； 以及
所述映射平面， 设置为根据所述接入服务节点发送的所述订阅请求建立 指向所述终端的订阅关系， 获得所述终端的位置信息发生变化的所述终端的 位置信息， 并且根据所述订阅关系向所述接入服务节点发送携带变化的所述 终端的位置信息的所述订阅通知。
11、 如权利要求 10所述的系统， 其中：
所述接入服务节点包括緩存模块、 与所述緩存模块连接的收发模块以及 与所述緩存模块和收发模块连接的维护模块， 其中， 所述緩存模块设置为緩 存终端的身份标识与位置信息的映射关系； 所述收发模块设置为向所述映射 平面发送指向所述终端的订阅请求，并且接收所述映射平面发送的订阅通知； 以及所述维护模块设置为根据所述订阅通知刷新所述緩存模块中存储的对应 终端的映射关系；
所述映射平面包括存储模块以及与所述存储模块连接的订阅管理模块， 其中， 所述存储模块设置为存储终端的身份标识与位置信息的映射关系， 存 储所述终端的身份标识与发送订阅请求的接入服务节点的订阅关系； 以及所 述订阅管理模块设置为接收所述接入服务节点发送的所述订阅请求， 根据所 述订阅请求建立指向所述终端的所述订阅关系， 并且根据所述订阅关系向对 应的接入服务节点发送所述订阅通知以将变化的所述终端的位置信息通知所 述接入服务节点。
12、 如权利要求 11所述的系统， 其中，
所述接入服务节点的所述收发模块还设置为： 向所述映射平面发送订阅 取消请求， 所述订阅取消请求中携带已建立订阅关系的终端的身份标识， 并 且接收所述映射平面返回的取消订阅成功响应；
所述映射平面的订阅管理模块设置为接收所述订阅取消请求并删除所述 接入服务节点对所述已建立订阅关系的终端的位置信息的订阅关系。
13、 如权利要求 10至 12中任一项所述的系统， 其中： 所述订阅请求是 独立的订阅请求， 或是通过在所述接入服务节点向所述映射平面发送的查询 请求或报文转发请求中携带的订阅参数实现的订阅请求。
14、 如权利要求 10至 12中任一项所述的系统， 其中： 所述位置信息发 生变化是指所述终端发生切换引起的位置信息改变或所述终端注销引起的位 置信息删除。
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