WO2009082935A1

WO2009082935A1 - Method, system and device for obtaining the address of mobile access gateway

Info

Publication number: WO2009082935A1
Application number: PCT/CN2008/073571
Authority: WO
Inventors: Xia Qin; Wei Yan; Xiaojun Yan
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-12-20
Filing date: 2008-12-18
Publication date: 2009-07-09
Also published as: CN101465887A

Abstract

A method, a system and a device for obtaining the address of mobile access gateway are disclosed in the embodiment of the present invention. The method includes the steps of: according to the Home Network Prefix of an aim Mobile Node, sending a request for inquiring the information relating to the Home Network Prefix of the aim Mobile Node to an address maintenance equipment which saves the information relating to the Home Network Prefix of the aim Mobile Node; obtaining the address of the aim Mobile Access Gateway (MAG), which the aim Mobile Node belongs to, from the information relating to the Home Network Prefix of the aim Mobile Node which is returned from the address maintenance equipment which saves the information relating to the Home Network Prefix of the aim Mobile Node. Thus it does not relate to the process of building the route optimization to obtain the address of the MAG, and so it does not depend on the route optimization mode. Thereby it has generally applicability, and improves the system capability.

Description

Mobile access gateway address acquisition method, system and device

[1] This application claims priority to Chinese Patent Application No. 200710301625.1, entitled "Mobile Access Gateway Address Acquisition Method, System and Device", filed on December 20, 2007, the entire contents of which are hereby incorporated by reference. It is incorporated by reference in this application.

[2] Technical field

[3] The present invention relates to the field of communications technologies, and in particular, to a mobile access gateway address acquisition method, system and device

[4] Background of the invention

[5] Currently, Proxy Mobile Internet Protocol version 6 (ΡΜΙΡνβ) is a network-side mobility management protocol that does not require mobile nodes (MNs) to involve signaling required for mobility management. Mobile entities in the network will track MNs. Move, and initiate mobile signaling and establish the required routing state.

[6] The core functional entities in the PMIPv6-based network are the local mobility anchor LMA and the mobile access gateway (

MAG). The LMA is responsible for maintaining the reachability status of the MN and is topologically anchored to the MN's Home Network Prefix (HNP). The MAG is an entity that performs mobility management on behalf of the MN, is located on the access link, and is responsible for detecting the mobility of the MN on its access link and transmitting the binding registration information to the L MA registered by the MN.

[7] Once the MN enters the PMIPv6 domain and connects to an access network, the MAG on the access network, after identifying the MN and obtaining its identity, will confirm whether the MN is authorized to the network mobility management service.

[8] If the network acknowledges that a network mobility management service needs to be provided to the MN, the network will provide an address for the MN via HNP. Once the address is configured, the MN has an address from its HNP. The LMA records the address of the MN through the care-of address (COA), and records the address of the MAG bound to the MN by binding the cache entry (Proxy-CoA), thereby transmitting and receiving packets to and from the MN.

[9] FIG. 1 is a schematic diagram of a routing path between two mobile nodes MN1 and MN2 in a PMIPv6 domain; as shown in FIG. 1, a solid line is a standard PMIPv6 route, and a dotted line is a route optimized by a PMIPv6 route. According to the P MIPv6 basic protocol, MN1 accesses MAG1, and MAG1 will register the binding of MN1 home network prefix and MAG1 address (ie Proxy-CoAl) to LMAr on behalf of MN1. Similarly, MN2 is also directed by MAG2 agent. LMA2 registration. When MN1 sends a data packet to MN2, the routing path of the standard PMIPv6 data packet is from MN1 to MAG1 to LMA1 to LMA2 to MAG2.

The MN2o packet will first pass through the bidirectional tunnel between MAGI and LMA1, and then pass through the bidirectional tunnel between LMA2 and MAG2 to reach MN2.

[10] Because the packet transmission between the MAG and the LMA needs to be encapsulated and decapsulated, the routing path of the packet must be encapsulated and decapsulated twice under standard routing rules. And too much packet processing overhead, so people have proposed a route optimization method, so that

The routing path between MN 1 and MN2 does not pass through any LMA 1 and LMA2, but the tunnel is directly established between MAG 1 and MAG 2. The packet path is from MN1 to MAG1 to MAG2.

MN2, thus avoiding the lengthy routing process and packet processing overhead caused by encapsulation and decapsulation.

[11] But no matter what kind of route optimization mode, the first problem to be solved is to obtain the routing address of the destination. That is, if MN1 wants to send the message to MN2 through the optimized route, then MAG1 must know the address of MAG2, which is two A tunnel is established to achieve the premise of PMIPv6 route optimization.

[12] In the prior art, for different route optimization modes, generally in the route optimization mode, the MAG address of the communication parties is exchanged by the message established for the road optimization mode, thereby solving the problem of obtaining the MAG address. The problem is that the establishment of different route optimization modes is different. The way to obtain the MAG address is different. Therefore, the existing method of obtaining the MAG address depends on the specific route optimization mode and does not have universal applicability.

[13] Summary of the invention

[14] The embodiment of the invention provides a mobile access gateway address acquisition method, system and device, which can not rely on a specific route optimization mode, has universal applicability, and improves system performance.

An embodiment of the present invention provides a method for acquiring a mobile access gateway address, including:

[16] According to the home network prefix of the destination mobile node, the address maintenance device that stores the information about the home network prefix of the destination mobile node sends a request for querying the home network prefix related information of the destination mobile node;

[17] acquiring, from the destination mobile node home network prefix related information returned by the address maintenance device that stores the home network prefix related information of the destination mobile node, the destination mobile access gateway MAG to which the destination mobile node belongs. the address of. [18] The embodiment of the present invention further provides a mobile access gateway address obtaining system, including:

[19] The source mobile access gateway is configured to: according to the home network prefix of the mobile node of the destination, to the address maintenance device that stores the information about the home network prefix of the destination mobile node, and send a query to query the home network prefix of the destination mobile node. Requesting the information; obtaining, from the returned destination home network prefix information of the mobile node, an address of the destination mobile access gateway MAG to which the destination mobile node belongs;

[20] The address maintenance device is configured to save the home network prefix related information of the destination mobile node, and receive a request sent by the source mobile access gateway to query the destination mobile node home network prefix related information, and return the destination mobile node. Home network prefix related information.

[21] The embodiment of the present invention further provides a mobile access gateway, including:

[22] The destination address request sending module is configured to: according to the home network prefix of the mobile node of the destination, to the address maintenance device that stores the information about the home network prefix of the destination mobile node, and send a query to query the home network prefix of the destination mobile node. Request for information;

[23] a destination address response receiving module, configured to acquire the destination mobile node from the destination mobile node home network prefix related information returned by the address maintenance device that stores the destination mobile node home network prefix related information The address of the mobile access gateway MAG to which it belongs.

[24] The embodiment of the present invention further provides a local mobility anchor point, including:

[25] a storage module, configured to store home network prefix related information of the destination mobile node;

[26] a request information receiving module, configured to receive, from the mobile access gateway, a request for querying the home network prefix related information of the destination mobile node;

[27] a response information sending module, configured to acquire, according to the request for the home network prefix related information of the destination mobile node, received by the request information receiving module, to acquire the hometown of the destination mobile node from the storage module The network prefix related information, and returns the home network prefix related information of the destination mobile node to the mobile access gateway.

[28] It can be seen from the foregoing technical solution that, according to the home network prefix of the destination mobile node, the embodiment of the present invention sends an inquiry to the address maintenance device that stores the information about the home network prefix of the destination mobile node, and sends a query to the destination mobile node home network. a request for the prefix related information; obtaining the destination mobile terminal to which the destination mobile node belongs from the destination mobile node home network prefix related information returned by the address maintenance device that stores the destination mobile node home network prefix related information Enter the address of the gateway MAG. This In this way, the MAG address can be obtained without involving the route optimization establishment process, and the route optimization mode is not relied on, which has universal applicability and improves system performance.

[29] BRIEF DESCRIPTION OF THE DRAWINGS

[30] FIG. 1 is a schematic diagram of a routing path between two mobile nodes MN 1 and MN 2 in a PMIPv6 domain in the prior art;

2 is a structural diagram of a MAG address acquisition system according to Embodiment 1 of the present invention;

3 is a structural diagram of a MAG address acquisition system according to Embodiment 2 of the present invention;

4 is a specific structural diagram of an MAG according to an embodiment of the present invention;

FIG. 5 is a specific structural diagram of an LMA according to an embodiment of the present invention.

[35] Mode for carrying out the invention

[36] The embodiment of the present invention mainly obtains a MAG address from the returned related information about the MN home network prefix by querying the LMA for related information about the MN home network prefix.

[37] Taking the network scenario shown in Figure 1 as an example, MN1 needs to send a message to MN2, then MN1 needs to pass source M.

The MAG1 establishes a route optimization path with the MAG of the MAG2 to which the MN2 belongs. The source MAG needs to obtain the address of the destination MAG before the routing path is established.

The MAG address acquisition system is as follows:

[38] Example 1:

FIG. 2 is a structural diagram of a MAG address obtaining system according to Embodiment 1 of the present invention. In FIG. 2, the system includes: a source mobile access gateway MAG and an address maintenance device; For the source mobile node, define MN2 as the destination mobile node, where:

[40] The source MAG is used to send a request for querying the MN2 home network prefix related information to the address maintenance device that stores the MN2 home network prefix related information according to the MN2 home network prefix; from the returned MN2 home network prefix related information. Obtain the address of the destination MAG2 to which the MN2 belongs;

[41] The address maintenance device is configured to save the MN2 home network prefix related information, receive the request sent by the source mobile access gateway to query the MN2 home network prefix related information, and return the MN2 home network prefix related information.

[42] Specifically, the source MAG may send a request for querying the MN2 home network prefix related information to the anycast address according to the anycast address formed by the MN2 home network prefix.

[43] The anycast address may be configured on the address maintenance device; the address maintenance device may be an LMA or The destination MAG; the returned MN2 home network prefix related information includes the address of the destination M AG to which the MN2 belongs.

[44] In the system, the specific steps of the source mobile access gateway acquiring the destination MAG address to which the MN2 belongs are: [45] Step 1, the source mobile access gateway saves the hometown of MN2 according to the home network prefix of the mobile node MN2. The address maintenance device of the network prefix related information sends a request for querying the MN2 home network prefix related information.

[46] The address maintenance device can be an LMA or a destination MAG. The request message may be a proxy care-of address query request (Query Proxy Care-of Address

Request) The message can also be any other customized message. What kind of message is used, the specific message format can be determined according to the specific address maintenance device.

[47] In the above request message, the source address of the message is the address of the source mobile access gateway, and the destination address is the anycast address formed by the MN2 home network prefix. For example, the network prefix is 64bit, and the anycast address can be the first 64 bits of the MN2 home network prefix, and the last 64 bits are all zeros. For the LMA, anycast address can be configured on the interface that the LMA connects to the backbone network.

[48] Step 2: Due to the characteristics of the anycast address, the request message in step 1 will be sent to the address maintenance device configured with the anycast address of the MN2 home network prefix, and the address maintenance device also stores the MN2 hometown. The address maintenance device of the network prefix related information. After receiving the message, the address maintenance device queries the binding cache entry corresponding to the MN2 home network prefix, and returns the queried cache entry information through the response message.

[49] The response message may be a proxy care-of address query response (Query Proxy Care-of Address

Response) The message can also be any other custom message, as long as it corresponds to the received request message.

[50] The binding cache entry information contains the address of the destination MAG to which the MN2 belongs, and the source MAG can obtain the address of the destination MAG after receiving the response message.

[51] After the source MAG obtains the address of the destination MAG, it can perform route optimization according to any existing route optimization mode.

[52] In addition, if the anycast address of the MN2 home network prefix is configured on the destination MAG, the destination MA G receives the query request message from the source MAG, and the destination MAG returns from the query response message. Your address.

[53] Example 2:

[54] In PMIPv6, the source MAG can obtain the MN2 home network prefix from the MN2 policy file during the authentication process; it can also be obtained through the MAG proxy MN registration process to the LMA, and therefore, can be in some common or well-known intermediate Network devices, such as domain name server DNS, dynamic host configuration protocol server D HCP sever, authentication, authorization, statistics server AAA

The server or the like maintains the binding of the MN2 prefix to its LMA address. For example, the LMA registers the maintenance prefix information with the related address maintenance device. The specific implementation method is not within the scope of the present disclosure.

[55] Since the source MAG knows the home network prefix of the MN2, the LMA address of the MN2 home network prefix can be requested to be maintained from the corresponding address maintenance device according to the prefix.

FIG. 3 is a structural diagram of a MAG address obtaining system according to Embodiment 2 of the present invention. The system differs from Embodiment 1 in that the system further comprises: an intermediate network device.

[57] The intermediate network device is configured to save an address of the address maintenance device that stores the MN2 home network prefix related information, and receive the information sent by the source mobile access gateway, and query and save the MN2 home network prefix related information. The address maintains a request for the address of the device; and returns a response message containing the address of the address maintenance device storing the information related to the MN2 home network prefix.

[58] The source mobile access gateway sends a request for querying the address maintenance device address of the MN2 home network prefix related information to the intermediate network device, and obtains the saved MN2 home network prefix from the returned response message. The address of the related information maintains the device address.

[59] Maintaining the device address by the obtained address of the MN2 home network prefix related information, and sending the query MN to the address maintenance device storing the related information of the mobile node MN2 home network prefix.

2 requests for information about the home network prefix.

[60] In the system, the specific steps of the source mobile access gateway acquiring the destination MAG address to which the MN2 belongs are: [61] Step 1, the source MAG is the MAG1 sending prefix query (prefix

Query) The message to the intermediate network device, the message contains the MN2 home network prefix. The specific message format depends on the specific address maintenance device. For example, if it is a DNS, the request message can be implemented by using a DNS message; if it is a DHCP server, it can be implemented by using a DHCP message.

[62] Step 2: After the related address maintenance device receives the request message, it will return a prefix response (prefix) Response) The message to MAGI, which contains the LMA2 address of the MAGI lookup.

[63] Step 3. After the MAGI obtains the LMA2 address, the sending proxy forwards the address query (proxy-CoA).

Query) message to LMA2, request MN2 home network prefix related information.

[64] Step 4. After receiving the above request, LMA2 will forward the address response through the proxy (proxy-CoA).

Response) The message returns the binding cache entry it maintains about the MN2 home network prefix.

[65] Step 5: The MAG1 obtains the mobile access gateway MAG2 address of the MN2 by using the binding cache entry for the MN2 home network prefix.

[66] After MAG1 obtains the MAG2 address, it can start the route optimization process.

[67] In addition, if the binding of the MN2 prefix and the MAG address can be directly maintained on the related address maintenance device, the source MAG can obtain the address of the required MAG by directly searching for the related device, without the process of step 3 and step 4.

[68] The following describes the two MAG address acquisition systems and the specific acquisition methods. The following describes the specific structure of the MAG as the source MAG and the specific structure of the LMA as the information about the MN2 home network prefix.

FIG. 4 is a structural diagram of a MAG according to an embodiment of the present invention. In FIG. 4, the MA G of the embodiment of the present invention includes: a destination address request sending module 401 and a destination address response receiving module 402.

[70] The destination address request sending module 401 is configured to save according to the home network prefix of the mobile node MN2.

The address maintenance device of the MN2 home network network prefix related information sends a request for inquiring about the MN2 home network prefix related information.

[71] The destination address response receiving module 402 is configured to obtain the address of the destination mobile access gateway MAG to which the MN2 belongs from the MN2 home network prefix related information returned by the address maintenance device that stores the MN2 home network prefix related information.

[72] The destination address request sending module 401 sends the address maintenance device that stores the MN2 home network prefix related information to the anycast address configured according to the anycast address generated by the home network prefix of the MN2. A request for querying MN2 home network prefix related information.

[73] Alternatively, the destination address request sending module 401 sends a request for querying the address maintenance device address of the MN2 home network prefix related information to the intermediate network device; and maintaining the obtained address of the MN2 home network prefix related information. Device address, to save the mobile node MN2 home network The address maintenance device of the prefix related information sends a request for querying the MN2 home network prefix related information.

[74] The destination address response receiving module 402 obtains, from the returned response message, the address maintenance device address that holds the information related to the MN2 home network prefix, and sends the address maintenance device address to the destination address request sending module 401.

FIG. 5 is a detailed structural diagram of an LMA according to an embodiment of the present invention. In FIG. 5, the LMA includes: a request information receiving module 501 and a response information transmitting module 502.

[76] The request information receiving module 501 is configured to receive a request for querying the MN2 home network prefix related information.

The response information sending module 502 is configured to return related information of the MN2 home network prefix to the sender of the request information according to the request information received by the request information receiving module 501.

[78] It should be noted that, in the above device embodiments, the respective units included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be implemented; The specific names are only for the purpose of distinguishing between the two, and are not intended to limit the scope of protection of the present invention.

In addition, those skilled in the art can understand that all or part of the steps in the method provided by the embodiments of the present invention can be completed by using hardware related to program instructions. For example, it can be done by computer running. The program can be stored in a readable storage medium such as a random access memory, a magnetic disk, a compact disk, etc.

[80] It can be seen from the foregoing embodiment that the home network prefix of the mobile node MN2 sends a request for querying the MN2 home network prefix related information to the address maintenance device that stores the MN2 home network prefix related information. And a method, a system, and a device for acquiring an address of a destination mobile access gateway MAG to which the MN2 belongs, from the MN2 home network prefix related information returned by the address maintenance device that stores the MN2 home network network related information, acquiring the MAG address It does not involve the route optimization establishment process, so it does not rely on the route optimization mode, has universal applicability, and improves system performance.

[81] It is to be understood that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Equivalent substitutions, improvements, etc., are intended to be included within the scope of the present invention.

Claims

Claim

[1] A mobile access gateway address obtaining method, comprising:

And sending, according to the home network prefix of the destination mobile node, an address maintenance device that stores the information related to the home network prefix of the destination mobile node, and sends a request for querying the information about the home network prefix of the destination mobile node;

Obtaining an address of the destination mobile access gateway MAG to which the destination mobile node belongs from the destination mobile node home network prefix related information returned by the address maintenance device that stores the destination mobile node home network prefix related information.

[2] The method according to claim 1, wherein the home network prefix according to the destination mobile node sends an inquiry to the address maintenance device that stores the information about the home network prefix of the destination mobile node. The request for the destination node network prefix related information of the mobile node includes: sending the query to the destination mobile node hometown generated by the home network prefix of the mobile node according to the destination and configured on the address maintenance device A request for information related to the network prefix.

[3] The method according to claim 1 or 2, wherein the address maintenance device is a local mobility anchor LMA or an MAG to which the destination mobile node belongs.

[4] The method according to claim 1, wherein the address maintenance device that stores the home network prefix related information of the destination mobile node sends a query for the destination mobile node home network prefix related information. Request, including:

And sending, to the intermediate network device that saves the address of the address maintenance device, a request for querying an address maintenance device address that stores information related to the home network prefix of the destination mobile node according to the home network prefix of the destination node;

Obtaining, from the returned response message, the address maintenance device address that saves information related to the home network prefix of the destination mobile node;

And acquiring, by the obtained address maintenance device address, where the destination mobile node home network prefix related information is saved, to the address maintenance device that saves the destination mobile node home network prefix related information, and sending the query for the destination mobile A request for information about the node's home network prefix.

[5] A mobile access gateway address obtaining system, comprising: The source mobile access gateway is configured to send, according to the home network prefix of the mobile node of the destination, an address maintenance device that stores the information about the home network prefix of the destination mobile node, and send a request for querying the home network prefix related information of the destination mobile node. Obtaining, from the returned destination home network prefix information of the mobile node, an address of the destination mobile access gateway MAG to which the destination mobile node belongs;

An address maintenance device, configured to save the home network prefix related information of the destination mobile node, receive a request sent by the source mobile access gateway to query the destination mobile node home network prefix related information, and return the destination mobile node home network prefix. Related Information.

[6] The system according to claim 5, wherein the source mobile access gateway sends an advertisement to an anycast address formed on the address maintenance device according to the destination mobile home network prefix. The request for the destination node network prefix related information of the destination node is queried.

[7] The system according to claim 5 or 6, wherein the address maintenance device is an LMA or an MAG to which the destination mobile node belongs.

[8] The system of claim 5, wherein the system further comprises:

And an intermediate network device, configured to save an address of the address maintenance device that stores the information related to the home network prefix of the destination mobile node, and receive the information sent by the source mobile access gateway, and query the home network of the destination mobile node Retrieving a request for a device address by an address of the prefix related information; returning, to the source mobile access gateway, a response message including the address maintenance device address storing the information about the home network prefix of the destination mobile node;

The source mobile access gateway is further configured to send, to the intermediate network device, a request for querying an address maintenance device address that saves information related to the home network prefix of the destination mobile node, and obtain the save from the returned response message. An address maintenance device address having the purpose of the mobile node home network prefix related information;

[9] A mobile access gateway, comprising:

A destination address request sending module, configured to save the home network prefix of the mobile node according to the destination An address maintenance device having the destination node network prefix related information of the destination node, and sending a request for querying the destination mobile node home network prefix related information;

a destination address response receiving module, configured to acquire, from the destination mobile node home network prefix related information returned by the address maintenance device that stores the destination mobile node home network prefix related information, the mobile station to which the destination mobile node belongs Address of the access gateway MAG.

[10] The mobile access gateway according to claim 9, wherein the destination address request sending module generates any configuration on the address maintenance device according to a home network prefix of the destination mobile node. The address sends a request for querying the information related to the MN home network prefix.

[11] The mobile access gateway of claim 9, wherein:

The destination address request sending module is further configured to send, according to the home network prefix of the destination mobile node, an intermediate network device that saves the address of the address maintenance device, and save the query to save the home network prefix of the destination mobile node. Retrieving the device address request by the address of the information; maintaining the device address by the obtained address of the destination network prefix related information of the destination mobile node, and storing the related information of the home network prefix of the mobile node of the mobile node The address maintenance device sends a request for querying the related information of the mobile node home network prefix of the destination;

The destination address response receiving module is further configured to: obtain, from the returned response message, the address maintenance device address that stores the information about the home network prefix of the destination mobile node, and send the address to the destination address request sending module.

[12] A local mobility anchor, characterized in that it comprises:

a storage module, configured to store home network prefix related information of the destination mobile node, and a request information receiving module, configured to receive, from the mobile access gateway, a request for querying the home network prefix related information of the destination mobile node;

a response information sending module, configured to acquire, according to the request for the home network prefix related information of the destination mobile node, that is received by the request information receiving module, obtain, from the storage module, a home network prefix related to the destination mobile node And returning, to the mobile access gateway, the home network prefix related information of the destination mobile node.