WO2013167031A2

WO2013167031A2 - Method and system for distributed position management in heterogeneous network

Info

Publication number: WO2013167031A2
Application number: PCT/CN2013/079249
Authority: WO
Inventors: 孙爱芳; 何经纬; 曹建福; 凌志浩; 高冲; 张志飞; 袁宜峰; 祁学文
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-01-25
Filing date: 2013-07-11
Publication date: 2013-11-14
Also published as: WO2013167031A3; CN103974226B; CN103974226A

Abstract

Disclosed are a method and a system for distributed position management in heterogeneous network. The method includes: local mobile anchor point (LMAP) provides its IP address and subnet prefix to the mobile terminal which enters its anchor region, configures the region care-of address (RCoA) and link care-of address (LCoA) of the mobile terminal; access subnet reports the position updating message of the mobile terminal to the LMAP of its anchor region, updates the binding address according to the new LCoA configured in the position updating message. The LMAP of the system is used to divide the network into different anchor regions, provides its IP address and subnet prefix to the mobile terminal which enters its anchor region through the access subnet, configures the RCoA and LCoA of the mobile terminal. Adopting to the invention, the register signaling flow is effectively decreased, so as to raise the performance of the network bandwidth, overcome the problem of communication interrupt caused by MAP fault at the same time.

Description

Distributed location management method and system in heterogeneous network

The present invention mainly relates to location management techniques in mobility management, and more particularly to a distributed location management method and system in a heterogeneous network. Background technique

Location management is one of the key technologies in wireless heterogeneous network mobility management. It is used to track, store, find and update the location information of mobile terminals. The existing location management scheme for location management of mobile terminals is mainly for one or two designated network settings, and the continual development of ubiquitous networks enables mobile terminals to work in a variety of heterogeneous network environments. The more common, the existing location management scheme for location management of mobile terminals can no longer meet the location management requirements of mobile terminals in multiple heterogeneous network environments. In the existing location management scheme for location management of a mobile terminal, when the mobile terminal moves back and forth in the boundary area of the visited network, an unnecessary registration signaling storm is generated between the mobile terminal and the home network, resulting in a significant degradation of network performance. , affecting the communication quality between the terminal and the network, reducing the convenience of the user to use the service, and at the same time, the communication interruption problem caused by the failure of the single mobile anchor point (MAP, Mobile Anchor Point), the existing location management solution for the location management of the mobile terminal Nor has it come up with an effective solution. Summary of the invention

In view of this, the main objective of the present invention is to provide a distributed location management method and system in a heterogeneous network, which effectively reduces registration signaling traffic, thereby improving network bandwidth performance and overcoming MAP failure. Communication interruption problem.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

A distributed location management method in a heterogeneous network according to an embodiment of the present invention, which adopts a global a hierarchical structure combining a mobility anchor GMAP and a local mobility anchor LMAP, the LMAP dividing the network into different anchor domains, all LMAPs and their associated anchor domains in the GMAP coverage area of the upper layer of the LMAP, An access subnet is simultaneously covered by multiple LMAPs;

The method includes: LMAP provides an IP address and a subnet prefix of the LMAP itself to the mobile terminal accessing the anchor domain through the access subnet, and configures the regional handover address RCoA and the link care-of address LCoA of the mobile terminal; the access subnet moves The location update message of the terminal is reported to the LMAP of the anchor domain to which it belongs, and the address binding update is performed according to the newly configured LCoA in the location update message.

The method further includes: the mobile terminal uses the LCoA as a care-of address, and the RCoA as a home address to perform local binding update with the LMAP, and the RCoA is simultaneously used as a care-of address to perform address binding with the GMAP.

The performing the address binding update according to the newly configured LCoA in the location update message includes: receiving, by the LMAP, the location update message sent by the mobile terminal, updating the address mapping relationship of the mobile terminal, and updating the address mapping relationship of the mobile terminal. The home address is updated with the newly configured LCoA address in the address update message.

The method further includes: the GMAP provides the IP address and the subnet prefix of the GMAP to the LMAP in the coverage area, and configures the RCoA and the LCoA of the LMAP; the LMAP uses the RCoA as the care-of address, and the LCoA serves as the home address and The GMAP performs a local binding update, and the RCoA simultaneously binds to the home server as a care-of address.

The method further includes: the mobile terminal enters the access subnet, and when the anchor domain belongs to the anchor domain, an LMAP can be selected from the plurality of LMAPs covering the access subnet as its local mobility anchor point.

A distributed location management system in a heterogeneous network according to an embodiment of the present invention, where the system is a hierarchical structure composed of a combination of GMAP and LMAP;

The GMAP is located on a layer above the LMAP and is configured to cover the GMAP area. All LMAPs and their associated anchor domains provide GMAP's own IP address and subnet prefix for all LMAPs in the GMAP area, and configure LMAP's RCoA and LCoA;

The LMAP is configured to divide the network into different anchor domains, and provide the LMAP's own IP address and subnet prefix for the mobile terminal that accesses the anchor domain of the LMAP through the access subnet, and configure the RCoA and the LCoA of the mobile terminal;

The access subnet is configured to be simultaneously covered by multiple LMAPs, and the location update message of the mobile terminal is reported to the mobile terminal entering the access subnet to the LMAP in the anchor domain to which the access subnet belongs, which will be from the LMAP configuration. Good location information is returned to the mobile terminal.

In the case that the LMAP of the mobile terminal does not change before and after the mobile terminal moves, the LCoA is used as the care-of address, and the RCoA is locally bound and updated by the LMAP as the home address, and the RCoA is simultaneously used as the care-of address and the address is bound to the GMAP. set.

The LMAP is configured to receive the location update message sent by the mobile terminal, update the address mapping relationship of the mobile terminal, and locally bind the home address of the mobile terminal to the newly configured LCoA address in the address update message. Update.

In the case that the LMAP of the mobile terminal changes before and after the mobile terminal moves, the RCoA is used as the care-of address, and the LCoA is locally bound and updated with the GMAP as the home address, and the RCoA is simultaneously used as the care-of address to address the address with the home server. set.

The access subnet is configured to enter an access subnet at the mobile terminal, and select one LMAP from the plurality of LMAPs covering the access subnet as the local when the access subnet belongs to the anchor domain. Move the anchor point.

The embodiment of the present invention adopts a hierarchical structure combining a Global Mobile Anchor Point (GMAP) and a Local Mobile Anchor Point (LMAP), and the LMAP divides the network into different anchor domains. All LMAPs and their associated anchor domains in the GMAP coverage area of the upper layer of LMAP, one access subnet is simultaneously covered by multiple LMAPs. The method of the embodiment of the present invention includes: LMAP entering the mobile terminal of the anchor domain to which the access subnet belongs Provides the IP address and subnet prefix of the LMAP itself, configures the regional handover address (RCoA, Regional Care-of Address) and link-of-link address (LCoA, on-Link Care-of Address) of the mobile terminal; The location update message of the terminal is reported to the LMAP of the anchor domain to which it belongs, and the address binding update is performed according to the newly configured LCoA in the location update message.

According to the embodiment of the present invention, because all the LMAPs in the GMAP coverage area and the anchor fields to which they belong, the LMAP divides the network into different anchor domains for management, and the GMAP, the LMAP, and the mobile terminal use the address binding update to forward the message of the mobile terminal. In the embodiment of the present invention, the registration signaling is restricted to the anchor domain, and the signaling storm caused by the large number of registration signaling caused by the mobile terminal directly interacting with the core network is avoided, thereby reducing the registration signaling traffic. , improved network bandwidth performance. Since one access subnet is covered by multiple LMAPs at the same time, and any LMAP fails, other LMAPs can be selected as local mobile anchors to access the mobile terminal, thereby overcoming the MAP failure, that is, the communication interruption caused by a LMAP failure. DRAWINGS

1 is a schematic diagram of a system architecture according to an embodiment of the present invention;

2 is a schematic diagram of a mobile terminal moving in a local anchor domain according to an application example 1 of the embodiment of the present invention;

FIG. 3 is a flowchart of a location update of a mobile terminal in a local anchor domain according to Embodiment 1 of the present invention;

4 is a schematic diagram of a mobile terminal moving between local anchor domains according to an application example 2 of the embodiment of the present invention;

FIG. 5 is a flowchart of location update between mobile anchor domains of a mobile terminal according to Embodiment 2 of the present invention. detailed description

In the embodiment of the present invention: a hierarchical structure combining GMAP and LMAP, LMAP Providing the IP address and subnet prefix of the LMAP itself to the mobile terminal accessing the anchor domain through the access subnet, configuring the regional handover address RCoA and the link care-of address LCoA of the mobile terminal; and accessing the subnet to update the location update message of the mobile terminal The LMAP reported to the anchor domain of the anchor field is updated according to the newly configured LCoA in the location update message.

The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.

The distributed location management method in the heterogeneous network of the embodiment of the present invention mainly includes the following contents:

A distributed location management method in a heterogeneous network, the method adopting a hierarchical structure combining a global mobility anchor GMAP and a local mobility anchor LMAP, the LMAP dividing the network into different anchor domains, located in the LMAP All LMAPs and their associated anchor domains in the GMAP coverage area of the upper layer, one access subnet is simultaneously covered by multiple LMAPs.

Based on the configuration of the foregoing hierarchical structure, the method includes: LMAP provides an IP address and a subnet prefix of the LMAP itself to a mobile terminal that accesses the anchor domain through the access subnet, and configures a regional handover address RCoA and a link care-of address of the mobile terminal. The LCoA accesses the subnet to report the location update message of the mobile terminal to the LMAP of the anchor domain to which it belongs, and performs address binding update according to the newly configured LCoA in the location update message.

Preferably, the method further includes: the mobile terminal uses the LCoA as the care-of address, and the RCoA as the home address to perform local binding update with the LMAP, and the RCoA simultaneously performs address binding with the GMAP as the care-of address.

Preferably, performing the address binding update according to the newly configured LCoA in the location update message specifically includes: the LMAP receiving the location update message sent by the mobile terminal, updating the address mapping relationship of the mobile terminal, and using the mobile terminal The home address is locally bound with the newly configured LCoA address in the address update message.

Preferably, the method further comprises: providing, by the GMAP, the IP address and the subnet prefix of the GMAP itself to the LMAP in the coverage area, configuring the RCoA and the LCoA of the LMAP; The RCoA is used as a care-of address, and the LCoA performs local binding update with the GMAP as a home address, and the RCoA simultaneously performs address binding with the home server (HA) as a care-of address.

Preferably, the method further includes: the mobile terminal enters the access subnet, and when the anchor domain belongs to the anchor domain, can select one LMAP from the plurality of LMAPs covering the access subnet as its local mobility anchor point. .

The distributed location management system in the heterogeneous network of the embodiment of the present invention mainly includes the following contents:

The system involved in the embodiment of the present invention is composed of GMAP, LMAP and access subnet, and GMAP and LMAP are combined to form a layered MAP system.

The GMAP is located at a higher level of the LMAP, and is configured to manage network access of the mobile terminal, and is responsible for receiving and forwarding signaling and packets within its management scope. The GMAP has large storage space and high-speed packet processing. Capability, can provide route aggregation function, and GMAP covers all LMAPs in the area and their associated anchor domains. GMAP provides its own IP address and subnet prefix to its covered LMAP, thus generating LMAP RCoA and LCoA. LMAP uses the LCoA as the care-of address and the RCoA as the home address to be locally bound with the GMAP. The RCoA is also bound to the HA as the care-of address. This method can limit the location registration signaling of the mobile terminal to the anchor domain.

The LMAP is configured to divide the network into different management domains, also called anchor domains. When the mobile terminal enters an anchor domain, the LMAP provides the mobile terminal with its own IP address and subnet prefix, thereby generating RCoA and LCoA of the mobile terminal. The mobile terminal binds the LCoA as the care-of address and the RCoA as the home address and the LMAP. The RCoA is also bound to the GMAP as the care-of address.

The access subnet is composed of an access router (AR, Access Router) and various mobile subnets such as UMTS, GSM, and WLAN managed by the access router. When the mobile terminal enters the access subnet, the access subnet will be a mobile terminal. The status information is reported to the LMAP in the anchor domain to which it belongs, and the LMAP will be configured. The good location information is returned to the mobile terminal through the access subnet; in particular, one access subnet can be simultaneously covered by multiple LMAPs. When the mobile terminal enters the access subnet, the LMAP selection algorithm is executed, and the appropriate LMAP is selected as the It moves the anchor point.

Compared with the prior art, for the location management of the mobile terminal, the prior art mainly implements the location management of the mobile terminal by setting a new terminal location management system and predicting the motion state of the terminal, and the system changes greatly. The embodiment of the invention only adopts the MAP hierarchical structure composed of LMAP and GMAP, and the modification of the system d.

For the prior art, a new terminal location management system is implemented to implement location management of the mobile terminal. The application file of the Chinese patent application number 201110144448.7 is a unified mobility management database, and the location update module is used to locate the user terminal. The information is processed to realize the location management of the mobile terminal. Although the scheme extends the mobile terminal location management technology from a single network environment to multiple heterogeneous network environments, the registration signaling storm generated between the mobile terminal and the home network when moving in the boundary area of the network cannot provide an effective solution. This leads to a drastic drop in network performance and greatly reduces the user's communication/data service experience.

For the prior art, the terminal motion state is predicted to implement the location management of the mobile terminal, and the application file of the Chinese patent application No. 200410057981.X is to estimate the destination area of the mobile terminal by the moving direction and speed of the mobile terminal, The terminal performs location management, and proposes a corresponding mobile terminal, location management device, location registration system and method. In the process of implementing location management, the scheme does not consider the heterogeneity of the ubiquitous network, and is applicable only to a single network, which cannot meet the location management requirements of the mobile terminal when moving in the heterogeneous network, and simultaneously between the terminal and the home network. The registration signaling storm did not propose a specific solution.

In order to meet the location management requirements of mobile terminals under heterogeneous network conditions, the distributed location management method and system of the hierarchical structure provided by the embodiments of the present invention have the following beneficial effects:

(1) A distributed location management system with hierarchical structure, the access subnet is covered by multiple LMAPs at the same time, avoiding the communication interruption caused by single MAP failure, and improving the user. Reliability and stability of communication. However, the prior art does not provide an effective solution for the failure of the MAP due to failure, damage, and the like.

Specifically, in the embodiment of the present invention, for a single MAP failure, that is, a single LMAP fails, because the access subnet is covered by multiple LMAPs simultaneously, when a single LMAP fails, an LMAP selection algorithm is executed, and the subnet is accessed. Re-selecting LMAP for connectivity overcomes the problem of communication/data service disruption due to single LMAP failure.

(2) The layered MAP system structure combined with the layered architecture of GMAP and LMAP ensures the reliability and continuity of communication.

Specifically, when the mobile terminal moves in the anchor domain, the GMAP and the LMAP can limit the location registration signaling of the mobile terminal to the anchor domain, and prevent the frequently-moving terminal from generating a large amount of registration signaling to be sent to the home server, resulting in the core network. A huge signaling load is generated, causing a significant handover delay, effectively overcoming the problem of a drastic drop in network performance caused by a registration signaling storm between the mobile terminal and the home server, and effectively reducing the location between the mobile terminal and the home server. Register signaling traffic to improve network bandwidth performance.

System embodiment:

FIG. 1 is a schematic diagram of a system architecture of the embodiment. The distributed location management system in this embodiment is composed of a global mobility anchor point GMAP, a local mobility anchor point LMAP, and an access subnet, and includes a core network connected to the GMAP. The home server connected to the core network, the LMAP and the AR between the access subnets.

Compared with LMAP, GMAP has large storage space and high-speed packet processing capability, manages network access of mobile terminals, provides route aggregation function, and is responsible for receiving and forwarding information and packets within its management scope. All LMAPs in the GMAP coverage area and their associated anchor domains can limit the location registration signaling of the mobile terminal to the anchor domain, avoiding signaling storms between the mobile terminal and the home server.

GMAP provides its own IP address and subnet prefix to its covered LMAP, resulting in LMAP's RCoA and LCoA. Among them, LMAP uses LCoA as the care-of address, RCoA as the home address and GMAP for local binding update, and RCoA is also used as the care-of address to bind with HA.

LMAP is used to divide the network into different management domains, also called anchor domains. LMAP manages all mobile terminals and access subnets in its own anchor domain, provides route aggregation functions, and is responsible for receiving and forwarding information and packets within its management scope.

The LMAP covers all access subnets in its own anchor domain. When the mobile terminal moves in the access subnet, it can limit the location registration signaling of the mobile terminal to its own anchor domain. When the mobile terminal enters an anchor domain, the LMAP provides the mobile terminal with its own IP address and subnet prefix, thereby generating RCoA and LCoA of the mobile terminal. The mobile terminal binds the LCoA as the care-of address and the RCoA as the home address to the LMAP. The RCoA is also bound to the GMAP as the care-of address.

The access subnet is composed of the AR and its managed UMTS, GSM, WLAN and other subnets. When the mobile terminal enters the access subnet, the access subnet reports the status information of the mobile terminal to the LMAP of the anchor domain to which it belongs. LMAP returns the configured location information to the mobile terminal through the access subnet.

The access subnet can be simultaneously covered by multiple LMAPs. When the mobile terminal enters the access subnet, the LMAP selection algorithm is executed, and the appropriate LMAP is selected as its mobility anchor. When the LMAP connected to the mobile terminal is damaged, the LMAP selection algorithm is executed to select the appropriate LMAP as its mobility anchor.

Application example 1: Before and after the mobile terminal moves, the local mobile anchor point LMAP of the mobile terminal does not change.

2 is a schematic diagram of a mobile terminal in a local anchor domain. As shown in FIG. 2, the local mobility anchor LMAP3 covers the access routers AR2 and AR3, and the AR3 is simultaneously connected to the GSM network and the WLAN network. The mobile terminal is moved by the GSM network during the movement To the WLAN network, the network handover process only occurs in the AR3, and the local mobility anchor point LMAP to which the mobile terminal belongs before and after the mobile does not change.

Based on the system architecture diagram of FIG. 2, FIG. 3 is a flow chart of location update of the mobile terminal in the local anchor domain of the system architecture, and the process includes the following steps:

Step 301: The mobile terminal sends a route request message to the access subnet.

In this step, when the mobile terminal moves from the GSM network to the WLAN network, the mobile terminal checks whether the current default router is reachable through the neighbor discovery mechanism. If the current default router is unreachable, it determines that the mobile terminal moves between the networks. The mobile terminal moves to a new link while the mobile terminal sends a routing request to the access subnet.

Step 302: The access subnet returns a route route advertisement message to the mobile terminal.

In this step, the access subnet receives a routing request from the mobile terminal, and the access subnet generates a route advertisement message for the mobile terminal, and sends a route advertisement message to the mobile terminal, and the mobile terminal performs according to the received route advertisement message. The stateless IP address is automatically configured to configure a new LCoA address for the terminal's current wireless network interface.

Step 303: The mobile terminal sends a location update message to the local anchor LMAP.

In this step, the mobile terminal generates its own location update message (LU, Location Update), and sends the message to the local anchor LMAP, where the source address is the newly configured LCoA, and the destination address is the IP address MapA of the local anchor LMAP.

Step 304: Local anchor LMAP updates the address mapping.

In this step, after receiving the location update message sent by the mobile terminal, the local anchor point LMAP updates the address mapping relationship of the mobile terminal, and sets the home address (HoA, Home Address) of the mobile terminal and the newly configured LCoA in the address update message. The address is bound to update.

Step 305: The local anchor LMAP returns a confirmation message to the mobile terminal.

Application example 2: Before and after the mobile terminal moves, the local mobile anchor point LMAP to which the mobile terminal belongs changes. 4 is a schematic diagram of a mobile terminal moving between local anchor domains according to an example. As shown in FIG. 4, in a process in which a mobile terminal moves from a UTMS network to a WLAN network, the access router is also switched from AR1 to AR3, and AR1 and The AR3 is respectively covered by the local anchor point 1 and the local anchor point 3. Therefore, before and after the mobile terminal moves, the local anchor point LMAP of the mobile terminal MN also changes, and the anchor domain 1 moves to the anchor domain 3.

Based on the system architecture diagram of FIG. 4, FIG. 5 is a flow chart of location update of the mobile terminal between local anchor domains of the system architecture, and the process includes the following steps:

Step 501: The mobile terminal sends a route request message to the access subnet.

In this step, when the mobile terminal moves from the UTMS network to the WLAN network, the mobile terminal checks whether the current default router is reachable through the neighbor discovery mechanism. If the current default router is unreachable, it is determined that the mobile terminal moves between the networks. The mobile terminal moves to a new link while the mobile terminal sends a routing request to the new access subnet.

Step 502: The access subnet returns a route advertisement message to the mobile terminal.

In this step, the access subnet receives a routing request from the mobile terminal, and the access subnet generates a route advertisement message for the mobile terminal, where the route advertisement message includes one or more LMAP information, and sends a route advertisement message to the mobile terminal. The terminal, according to the received route advertisement message, performs automatic configuration of the stateless IP address to configure a new LCoA address for the current wireless network interface of the terminal.

Step 503: The mobile terminal performs an LMAP selection algorithm.

In this step, the mobile terminal performs an LMAP selection algorithm according to all registrable local anchor LMAP lists in the received route advertisement message, selects an optimal LMAP, and replaces the old LMAP information with the new LMAP information.

Step 504: The mobile terminal sends a location update message to the local anchor LMAP.

In this step, the mobile terminal generates its own LU, and sends a message to the newly selected local anchor point LMAP, where the source address is the newly configured LCoA, and the destination address is the newly selected local anchor point LMAP. IP address MapA.

Step 505: Local anchor LMAP update address mapping.

In this step, the newly selected local anchor LMAP receives the location update message from the mobile terminal, establishes the address mapping relationship of the mobile terminal, and binds the HoA of the mobile terminal with the newly configured LCoA address in the address update message.

Step 506: The local anchor LMAP sends a location update message to the global anchor GMAP. In this step, the new local anchor point LMAP sends a location update message LU to the global anchor point GMAP, and the location update message includes the home address HoA of the mobile terminal.

Step 507: Global Anchor GMAP Update Address Mapping

In this step, the global anchor GMAP receives the location update message from the local anchor LMAP, searches the address mapping table according to the location update message, deletes the mapping between the mobile terminal and the old LMAP address, and establishes an address mapping between the mobile terminal and the new LMAP. relationship.

Step 508: The global anchor GMAP returns an acknowledgement message to the local anchor LMAP.

Step 509: The local anchor LMAP returns a confirmation message to the mobile terminal.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Industrial applicability

In the embodiment of the present invention, the network is divided into different anchor domains for management, and the address binding update is used between the GMAP, the LMAP, and the mobile terminal, and the message of the mobile terminal is forwarded to the core network. In the embodiment of the present invention, since the registration signaling is restricted to the anchor domain, the signaling storm caused by a large amount of registration signaling caused by the mobile terminal directly interacting with the core network is avoided, thereby reducing registration signaling traffic and improving network bandwidth. performance. Since one access subnet is covered by multiple LMAPs at the same time, and any LMAP fails, other LMAPs can be selected as local mobility anchors to access the mobile terminal, thereby overcoming the MAP failure, that is, the communication interruption problem caused by an LMAP failure.

Claims

claims

1. A distributed location management method in a heterogeneous network. This method adopts a hierarchical structure that combines global mobility anchor point GMAP and local mobility anchor point LMAP. The LMAP divides the network into different anchor domains, located in all locations. All LMAPs in the coverage area of the GMAP above the above-mentioned LMAP and the anchor domains to which they belong, and one access subnet is covered by multiple LMAPs at the same time;

The method includes: LMAP provides the LMAP's own IP address and subnet prefix to the mobile terminal that enters the anchor domain to which it belongs via the access subnet, and configures the mobile terminal's regional care-of address RCoA and link care-of address LCoA; the access subnet will move The location update message of the terminal is reported to the LMAP in the anchor domain to which it belongs, and the address binding is updated according to the newly configured LCoA in the location update message.

2. The method according to claim 1, wherein the method further includes: the mobile terminal uses the LCoA as the care-of address, the RCoA as the home address and LMAP to perform local binding update, and the RCoA simultaneously serves as the care-of address and the LMAP. GMAP performs address binding.

3. The method according to claim 1, wherein performing address binding update according to the newly configured LCoA in the location update message specifically includes: the LMAP receives the location update message sent by the mobile terminal, and performs the following steps on the mobile terminal: The address mapping relationship is updated, and the home address of the mobile terminal and the newly configured LCoA address in the address update message are locally bound and updated.

4. The method according to claim 1, wherein the method further includes: GMAP provides GMAP's own IP address and subnet prefix to the LMAP within its coverage area, and configures the RCoA and LCoA of the LMAP; the LMAP configures the RCoA As a care-of address, the LCoA serves as a home address for local binding update with GMAP, and the RCoA simultaneously serves as a care-of address for address binding with the home server.

5. The method according to any one of claims 1 to 4, wherein the method further includes: the mobile terminal enters the access subnet, and when moving in the anchor domain to which the access subnet belongs, can cover the access subnet. Select one LMAP among multiple LMAPs in the subnet as its local mobility anchor point.

6. A distributed location management system in a heterogeneous network, which is composed of GMAP and LMAP A hierarchical structure formed by combining; among them,

The GMAP is located at the upper layer of the LMAP, is configured to cover all LMAPs in the GMAP area and the anchor domains to which they belong, provides GMAP's own IP address and subnet prefix for all LMAPs in the GMAP area, and configures the RCoA and RCoA of the LMAP. LCoA;

The LMAP is configured to divide the network into different anchor domains, provide the IP address and subnet prefix of the LMAP itself for mobile terminals that enter the anchor domain to which the LMAP belongs via the access subnet, and configure the RCoA and LCoA of the mobile terminal;

The access subnet is configured to be covered by multiple LMAPs at the same time. For the mobile terminal entering the access subnet, the location update message of the mobile terminal is reported to the LMAP in the anchor domain to which the access subnet belongs, and the configuration from the LMAP is Good location information is returned to the mobile terminal.

7. The system according to claim 6, wherein when the LMAP to which the mobile terminal belongs does not change before and after the mobile terminal moves, the LCoA is used as the care-of address and the RCoA is used as the home address to perform local binding updates with the LMAP, so The above RCoA also serves as the care-of address for address binding with GMAP.

8. The system according to claim 6, wherein the LMAP is further configured to receive the location update message sent by the mobile terminal, update the address mapping relationship of the mobile terminal, and compare the home address of the mobile terminal with the address of the mobile terminal. The newly configured LCoA address in the update message performs local binding update.

9. The system according to claim 6, wherein when the LMAP to which the mobile terminal belongs changes before and after it moves, the RCoA is used as a care-of address, and the LCoA is used as a home address to perform local binding update with GMAP, RCoA also serves as the care-of address for address binding with the home server.

10. The system according to any one of claims 6 to 9, wherein the access subnet is further configured to when the mobile terminal enters the access subnet and moves from the anchor domain to which the access subnet belongs. Select one LMAP from multiple LMAPs covering the access subnet as its local mobility anchor point.