WO2008151492A1

WO2008151492A1 - Method for selecting mobile managing mode in wireless network

Info

Publication number: WO2008151492A1
Application number: PCT/CN2007/003904
Authority: WO
Inventors: Zaifeng Zong; Gang Chen; Hongyue Sun; Min Fang
Original assignee: Zte Corporation
Priority date: 2007-06-15
Filing date: 2007-12-29
Publication date: 2008-12-18
Also published as: CN101325798B; CN101325798A

Abstract

A method for selecting mobile managing mode in wireless network is provided, which is applied as the mobile terminal configures the IPv6 address when it accesses the wireless network, and comprises the steps of: firstly, the mobile terminal sends a Dynamic Host Configuration Protocol discovery message to the access gateway based on its supported mobile managing mode; secondly, the access gateway selects the mobile managing mode for the mobile terminal based on the received Dynamic Host Configuration Protocol discovery message; lastly, the access gateway sends the selected mobile managing mode to the mobile terminal. With the invention, when a mobile terminal accesses a wireless network and configures the IPv6 address, the mobile managing mode could be determined; and when a mobile terminal performs the inter-network handover, the service continuity capability could be improved, in addition, when the mobile terminal performs access, the access capability of the access network could be improved.

Description

Method for selecting mobile management mode in wireless network

The present invention relates to a mobility management mode in a wireless network, and more particularly to a method for selecting a mobility management mode in a wireless network. Background technique

Mobile IP (MIP, Mobile IP) is a widely accepted mobile management protocol that keeps the IP connection of mobile terminals (MN, Mobile Node) uninterrupted when moving between different networks. In mobile IP, the mobile terminal keeps its home address (HoA, Home of Address) unchanged. When the access point of the mobile terminal changes, the mobile terminal informs the home network of the change through a binding update (Binding Update, applicable to MIPv6) or a registration request message (RRQ, Register Request, applicable to MIPv4) (Home Network) a Home Agent (HA) to enable the data sent to the mobile terminal to be properly routed to the new access point.

Mobile IP technology requires mobile terminals to support the Mobile IP protocol. In reality, there are very few mobile terminals that support mobile IP. Therefore, a technology for Proxy Mobile IP (PMIP) has been developed. Proxy mobile IP means that there is a proxy node (Proxy mobile IP Agent) in the access network. When the mobile terminal moves between different access points, the proxy node is responsible for sending the mobile IP binding update to the home agent instead of the mobile terminal. A message or registration request message to inform the home agent of the new location of the mobile terminal.

When a mobile terminal moves between different types of networks, such as from a Universal Mobile Telecommunications System (UMTS) network to a Wireless Fidelity (WiFi) network, it is often necessary to switch from one network adapter to another. The network adapter, for example, switches from the PCMCIA (Personal Computer Memory Card International Association) card that supports UMTS to the WiFi network card. At this time, to support the service without interruption, different network adapters must use the same before and after the switch. IP address (ie HoA). However, in the current implementation of the wireless terminal, the IP layer and the MAC layer are not well separated. Therefore, most mobile terminals do not support this function. Such a mobile terminal cannot use proxy mobile IP to maintain the continuity of the service when doing cross-network type handover, but must Use mobile IP to keep your business contiguous.

In addition, support for proxy mobile IP should be an ability to access the network, but many existing access networks do not have the ability to support proxy mobile IP. Also, proxy mobile IPv6 introduces new variables, which requires the home agent to also support these variables to support proxy mobile IP.

When a mobile terminal is activated in a new access network or switched to a new access network, selecting a proxy mobile IP or a standard mobile IP becomes a new problem. This requires a comprehensive consideration of the capabilities of the mobile terminal and its contracting capabilities, the ability to access the network, and the capabilities of the home agent. Mobile terminals may support standard mobile IP (such as MIPv4 or MIPv6) or may not support standard mobile IP. When the mobile terminal does not support mobile IP, the access network is required to support the proxy mobile IP, otherwise the service continuity of the mobile terminal cannot be guaranteed. Take IPv6 as an example. The possible combinations are shown in Table 1.

Table 1, mobile IP selection combination table

As can be seen from Table 1, in most cases, the selection result is determined. For example, when the mobile terminal supports both ΜΙΡν6 and ##ν6, and the home agent only supports MIPv6, it does not need to consider the support capability of the access network. Make sure the selection is MIPv6. The selection problem exists only in a few cases. For example, the mobile terminal and the home agent support both MIPv6 and PMIPv6. When the access network only supports PMIPv6, further selection is needed to obtain the exact result. However, even in the case where the results shown in Table 1 are determined, there are still how to know the network entities. The issue of mobile management protocols supported by his entity. For example, how does the mobile terminal know that the access network supports PMIPv6, so choose PMIPv6 as the current mobility management protocol? How does the access network know if the home agent of the mobile terminal supports PMIPv6?

The Worldwide Interoperability for Microwave Access (WiMax) standard defines an implicit selection method for mobility management protocols that do not require capability interaction. In WiMax, it is stipulated that when the mobile terminal (MS, Mobile Station) supports MIPv4, MIPv4 is preferred, otherwise the proxy moves IPv4. After the access authentication of the mobile terminal ends, the access gateway sends a Router Advertisement (RA) message to the mobile terminal, where the message includes the address of the access gateway, and the address is used as the mobile terminal. Forwarding address (CoA, Care-of-address). If the access gateway receives the registration request message sent by the mobile terminal, the access gateway determines that the mobile terminal supports MIPv4, and then selects the MIPv4 protocol as the mobility management protocol of the mobile terminal; if the access gateway receives the mobile terminal, If the dynamic host configuration protocol (DHCP) discovers the message, the access gateway considers that the mobile terminal does not support MIPv4, and then selects PMIPv4 as the mobile management protocol of the mobile terminal.

This implicit mobility management protocol selection method in WiMax only supports IPv4 and can only be used in the case of preferred terminal-based mobile IP (Client based MIP). A new approach is needed when IPv6 support is required, or when it is necessary to support preferred proxy mobile IP. Summary of the invention

The technical problem to be solved by the present invention is to provide a method for selecting a mobility management mode in a wireless network, in order to implement a mobile management mode in a process of configuring a mobile terminal to access an IPv6 address of a wireless network.

The technical solution adopted by the present invention is a method for selecting a mobility management mode in a wireless network, and is applied to the process of configuring an IPv6 address when the mobile terminal accesses the wireless network, and includes the following steps:

(1) The mobile terminal sends a dynamic host configuration protocol discovery message to the access gateway according to a mobility management mode supported by the mobile terminal; (2) the access gateway selects the mobility management mode for the mobile terminal according to the received dynamic host configuration protocol discovery message;

(3) The access gateway sends the selected mobility management mode to the mobile terminal. Further, in the mobile terminal access authentication process, the mobile terminal is assigned a home agent, and the home agent is a home agent list composed of one or more home agents;

After the access authentication of the mobile terminal is completed, the IPv6 address is configured with the access gateway through a dynamic host configuration protocol.

Further, in the mobile terminal access authentication process, the subscription mobile management mode of the mobile terminal and the mobility management mode supported by the home agent allocated to the mobile terminal are sent to the access gateway.

Further, in step (2), the access gateway is configured according to a mobility management mode supported by the mobile terminal, a mobility management mode supported by the access gateway, a subscription mobility management mode of the mobile terminal, and an allocation for the mobile terminal. A mobility management mode supported by the home agent to select the mobility management mode for the mobile terminal.

Further, in step (1), if the mobility management mode supported by the mobile terminal and desired to be used is Mobile IPv6, adding a home network identity option of the mobile terminal in the dynamic host configuration protocol discovery message;

If the dynamic host configuration protocol discovery message received by the access gateway carries the home network identifier of the mobile terminal, the mobile terminal is considered to support mobile IPv6, otherwise the mobile terminal is considered to support the proxy mobile IPv6.

Further, in step (1), if the mobile terminal subscribes to the mobility management mode and the mobile terminal supports mobile IPv6, the access network preferentially selects the mobile IPv6, and the mobile home IPv6 is supported in the candidate home agent list. The home agent, the access gateway selects mobile IPv6 as the mobile management mode of the mobile terminal;

If the mobile terminal subscribes to the mobility management mode and the mobile terminal supports the proxy mobile IPv6, the access network preferentially selects the proxy mobile IPv6, and the home agent list in the candidate home agent list supports the home agent of the proxy mobile IPv6. And the access network selects the proxy mobile IPv6 as the Mobile management mode of the mobile terminal.

Further, if the access gateway does not receive the subscription mobility management mode of the mobile terminal sent by the mobile terminal and the mobility management mode supported by the home agent allocated to the mobile terminal, if the mobile terminal Supporting mobile IPv6, and the access network preferentially selects the mobile IPv6, the access gateway selects mobile IPv6 as the mobile management mode of the mobile terminal; if the mobile terminal supports proxy mobile IPv6, and the access network preferentially selects The proxy mobile IPv6, the access gateway selects the proxy mobile IPv6 as the mobile management mode of the mobile terminal.

Further, in step (3), the access gateway further determines, for the mobile terminal, a home agent whose supported mobility management mode is consistent with the selected mobility management mode.

Further, in step (3), the access network notifies the mobility management mode selected by the mobile terminal by adding a home agent option in the dynamic host configuration protocol response message; if the dynamic host configuration protocol response Adding the home agent option to the message, the selected mobility management mode is Mobile IPv6, otherwise the selected mobility management mode is Proxy Mobile IPv6;

The home agent option includes an IPv6 address of the home agent.

Further, the access network notifies the mobile terminal to configure an IPv6 address through a dynamic host configuration protocol by using a route advertisement message.

In summary, the present invention can realize the mobile management mode in the process of configuring the IPv6 address of the mobile terminal to access the wireless network; and can improve the service continuity capability of the mobile terminal when doing cross-network type handover and the access network Access capability when the access terminal accesses. BRIEF abstract

1 is a schematic diagram of an architectural embodiment of a system in which the method of the present invention is located;

2 is a schematic flow chart of an embodiment of a method of the present invention;

3 is a schematic flow chart of an application embodiment of the method of the present invention;

4 is a flow chart showing another application embodiment of the method of the present invention. Preferred embodiment of the invention

The technical solution of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

FIG. 1 is a schematic diagram of an architecture embodiment of a system in which a method according to the present invention resides, taking a trusted non-3GPP network (Trusted non 3GPP) and 3GPP interworking as an example. The mobile terminal is located in the range covered by the trusted non-3GPP access network. The following describes the network elements and interfaces in Figure 1. The equipment in the figure is as follows:

A data network gateway (PDN GW), which has a home agent function and is an egress gateway to an external data network.

3GPP authentication, authorization, and accounting server (3GPP AAA Server, where AAA is: Authentication, Authorization, Accounting): The 3GPP home network located in the mobile terminal, responsible for accessing the mobile terminal, establishing the IPSec tunnel, and authenticating the mobile IP protocol. And is responsible for allocating data network gateways to mobile terminals.

3GPP Proxy AAA: A trusted non-3GPP network that is responsible for the secure forwarding of AAA messages and controls the admission of mobile terminals to non-3GPP networks.

Home Subscriber Server (HSS): A 3GPP home network located in a mobile terminal, used to store registration information of a mobile terminal, including an authentication vector of a mobile terminal, subscription information, and the like. It works with the 3GPP AAA Server to complete authentication and authorization for users.

The interface in the figure is described as follows:

S2a: The interface between the data network gateway and the trusted non-3GPP. When the trusted non-3GPP network supports the proxy mobile IP, the interface is valid. Otherwise, the interface does not exist. The proxy mobile IP protocol is running on this interface.

S2c: The interface between the mobile terminal and the data network gateway. When the terminal is used to access the mobile terminal, the interface is used. This interface runs the Mobile IP protocol.

Ta*: An interface between a trusted non-3GPP network and a 3GPP AAA proxy running the AAA protocol.

Wd*: The interface between the 3GPP AAA server and the 3GPP AAA proxy. This interface is mainly used for forwarding AAA messages.

Wx*: Interface between the 3GPP AAA server and the home user server, mainly used to obtain Signing and authentication information of the mobile terminal.

S6c: An interface between the data network gateway and the 3GPP AAA server. The interface is used to obtain the authentication information related to the mobile IP.

In this architecture diagram, the mobile terminal may only support mobile IP, or it may only support proxy mobile IP, or both. The access gateway may only support mobile IP, or may only support proxy mobile IP, or both. Both support; the data network gateway (ie, home agent) may only support mobile IP, or it may only support proxy mobile IP, or both. Therefore, it is necessary to select a mobility management protocol used by the mobile terminal when the mobile terminal accesses.

Figure 2 shows an embodiment of the method of the present invention, comprising the following steps:

Step 201: The HSS/3GPP AAA server allocates a list of candidate home agents to the mobile terminal in the access authentication process of the mobile terminal, where the list includes at least one home agent. And sending the IP address of each home agent in the candidate home agent list and the supported mobility management mode, and the subscription mobility management mode of the mobile terminal to the access gateway located in the access network. The access gateway stores the IP address and mobility management mode of each home agent, and the subscription mobility management mode of the mobile terminal.

In this step, the mobility management mode supported by each home agent and the subscription mobility management mode of the mobile terminal may not be sent to the access gateway located in the access network, thereby defaulting the mobility management mode capabilities of each home agent, and moving. The terminal's subscription mobility management mode capabilities support both MIPv6 and proxy MIPv6.

Step 202: After the mobile terminal access authentication is completed, the gateway device supporting the IPv6 access network sends a route advertisement message to the mobile terminal, and sets the M/0 flag in the route advertisement message to 1, if the message carries the IP address. The prefix extension also informs the mobile terminal that the mobile terminal must configure the IPv6 address (statefiil address autoconfiguration) in a stateful manner by setting the A flag in the IP address prefix of the message to 0, and also set the IPv6 address through DHCP. .

Step 203: After receiving the route advertisement message, the mobile terminal sends a DHCP discovery message configuration IP address to the access network according to the mobility management mode information supported by the mobile terminal. If the mobile terminal supports and wishes to use Mobile IPv6, the mobile terminal adds in the DHCP discovery message sent to the access network. Add the home network ID (Home Network ID) option of the mobile terminal; otherwise, the DHCP discovery message sent by the mobile terminal to the network does not carry the home network identifier.

Step 204: The access gateway of the access network is based on the DHCP discovery message sent by the mobile terminal, its own mobility management mode, and the mobility management mode of each home agent stored in step 201, and the subscription mobility management mode of the mobile terminal is the mobile The terminal selects the mobility management mode and determines a home agent. The specific way can be:

The access network's policy may be mobile IPv6 (ie, terminal-based mobile IPv6) prioritization, or proxy mobile IPv6 (ie, network-based mobile IPv6) prioritization. When the mobile terminal subscription capability supports Mobile IPv6, the access network policy is Mobile IPv6 preferred, and the mobile terminal supports Mobile IPv6, the access gateway selects the mobile as long as there is a home agent supporting Mobile IPv6 in the stored candidate agent list. IPv6 as a mobile management mode for mobile terminals;

When the mobile terminal subscription capability supports the proxy mobile IPv6, the access network policy is the proxy mobile IPv6 preference, and the mobile terminal supports the proxy mobile IPv6, as long as the stored home agent list has a home agent supporting the proxy mobile IPv6, access The gateway then chooses to proxy mobile IPv6 as the mobile management mode of the mobile terminal. While selecting the mobility management mode for the mobile terminal, the access gateway determines a home agent for the mobile terminal from the list of candidate home agents, and the determined mobility management mode supported by the home agent must be consistent with the selected mobility management mode. The method may be, but is not limited to, sequentially querying from the stored list of home agents, selecting the first home agent that is consistent with the selected mobility management mode.

If the mobility management mode supported by each home agent and the subscription mobility management mode of the mobile terminal are not sent to the access gateway in step 201, the access gateway considers that the subscription of each home agent and the mobile terminal supports both mobile IPv6 and the proxy. Mobile IPv6, therefore, mobile IPv6 is selected for the mobile terminal as long as both the mobile terminal and the access gateway support Mobile IPv6, and the mobile IPv6 is selected for the mobile terminal as long as both the mobile terminal and the access gateway support Proxy Mobile IPv6.

Step 205: The access network sends an IP address or an IP address prefix assigned by the DHCP server to the mobile terminal, and a mobility management mode selected by the DHCP terminal to the mobile terminal by using a DHCP response message through interaction with the DHCP server. Specifically:

If the access gateway determines that the mobile terminal uses mobile IPv6, the access network communicates with the DHCP server to allocate the IPv6 address or IPv6 address of the DHCP server to the mobile terminal. And the home agent option is added to the DHCP response message and sent to the mobile terminal; if the access gateway determines that the mobile terminal uses the proxy mobile IPv6, the access network allocates the DHCP server to the mobile terminal through interaction with the DHCP server. The IP address or IP address prefix, that is, the HoA is sent to the mobile terminal through a DHCP response message.

Step 206: After receiving the DHCP response, the mobile terminal checks whether the message has a home agent option: if the option is included, the mobile terminal determines that the mobile IPv6 needs to be enabled, otherwise the mobile terminal determines that the proxy mobile IPv6 needs to be enabled.

The following is further illustrated by an application example of the present invention.

Figure 3 is a flow diagram of an application embodiment of the method of the present invention, based on the architecture shown in Figure 1. The steps of the flow chart shown in Figure 3 are as follows:

Step 301: When the mobile terminal accesses, the system authenticates the mobile terminal, and assigns it a list of candidate home agents, and moves the IP address of each home agent in the list and the supported mobile management mode and the subscription movement of the mobile terminal. The management mode information is sent to the access gateway located in the access network during the authentication process.

Step 302: The access network saves an IP address and a mobility management mode of each home agent, and a subscription mobility management mode of the mobile terminal.

Step 303: After the access authentication of the mobile terminal is successful, the access gateway sends a route advertisement message to the mobile terminal. The M flag and the 0 flag of the message are both set to 1. If the message is prefix extended, the A flag in the prefix is set to 0. Such a flag setting will enable the mobile terminal to adopt a stateful address configuration mode, that is, to configure an IP address via DHCP.

Step 304: After receiving the route advertisement message, the mobile terminal sends a DHCP discovery message configuration IP address to the access network according to the mobility management mode information supported by the mobile terminal. At this time, the mobile terminal supports and wants to use the mobile IPv6. Therefore, the mobile terminal adds the home network identification option to the DHCP discovery message. The home network identifier of the mobile terminal is a full domain name, which identifies the network to which the mobile terminal belongs.

Step 305: The access gateway selects a mobility management mode that is accessed by the mobile terminal. The access network receives the home network identification option in the DHCP discovery message from the mobile terminal, and the access network determines that Mobile terminals support and want to use Mobile IPv6. The access network policy here is mobile IPv6 priority, the mobile terminal's subscription capability supports mobile IPv6, and the home agent list in the candidate home agent list supports mobile IPv6. Therefore, the access network selects mobile IPv6 as mobile for the mobile terminal. Management mode. While selecting the mobility management mode of the mobile terminal, the access network determines a home agent supporting mobile IPv6 for the mobile terminal from the list of candidate home agents.

Step 306: The access network acts as a DHCP relay, and forwards the DHCP discovery message received from the mobile terminal in step 304 to the DHCP server.

Step 307: The DHCP server allocates an IPv6 address or an IPv6 address prefix to the mobile terminal, and sends a DHCP response message to the access network.

Step 308: The access network adds a home agent option to the received DHCP response message and sends the message to the mobile terminal. The home agent option contains the IPv6 address of the home agent as determined in step 305. After receiving the DHCP response message, the mobile terminal has the home agent option in the message, and the mobile terminal determines that mobile IPv6 needs to be enabled and saves the IP address of the home agent.

Step 309: The DHCP process is completed between the mobile terminal and the DHCP server. The mobile terminal configures its CoA according to the IP address or IP address prefix in the DHCP response message.

Step 310: Establish an IPsec tunnel between the mobile terminal and the determined home agent according to the requirement, the mobile terminal obtains the home address HoA from the home agent, and performs a mobile IPv6 binding update process between the mobile terminal and the home agent.

In the above step 308, the IP address of the home agent in the home agent option may also be sent to the DHCP server by the access network through the DHCP discovery message in step 306, and then the DHCP server will re-connect the home agent in the DHCP response message. The network is forwarded to the mobile terminal.

The application embodiment shown in FIG. 3 is described by taking an example in which the access network selects the mobile IP based on the terminal. The following another application embodiment uses the access network to select the mobile IP based on the network as an example. As shown in Figure 4. The steps 401 to 403 are the same as the above steps 301 to 303, but:

Step 404: After the mobile terminal receives the route advertisement message, according to the mobile supported by itself The management mode information sends a DHCP discovery message configuration IP address to the access network. Here, the mobile terminal only supports Proxy Mobile IPv6, or both Mobile IPv6 and Proxy Mobile IPv6, but does not want to use Mobile IPv6. Therefore, the DHCP Discover message does not carry the Home Network Identity option.

Step 405: The access gateway selects a mobility management mode that is accessed by the mobile terminal. If the DHCP discovery message received by the access network from the mobile terminal does not carry the home network identification option, the access network determines that the mobile terminal supports the proxy mobile IPv6. The access network policy here is that the proxy mobile IPv6 priority, and the subscription capability of the mobile terminal supports the proxy mobile IPv6, and the home agent list supporting the proxy mobile IPv6 is also included in the candidate home proxy list. Therefore, the access gateway selects the proxy mobile for the mobile terminal. IPv6 is its mobile management model. While selecting the mobility management mode of the mobile terminal, the access network determines, from the list of candidate home agents, a home agent supporting the mobile IPv6 for the mobile terminal.

Step 406: The access network performs a DHCP interaction with a DHCP server located in the same domain as the home agent, and allocates a home address HoA to the mobile terminal.

Step 407: Perform a binding update procedure of the proxy mobile IPv6 between the access network and the determined home agent. The process establishes a binding relationship between the HoA of the mobile terminal and the access network in the home agent.

Step 408: The access network sends a DHCP response message to the mobile terminal, where the access network brings the HoA assigned in step 406 to the mobile terminal. This message does not have a home agent option. The mobile terminal determines that the selected mobility management mode is the proxy mobile IP based on the message without the home agent option.

When the access network determines that the proxy mobile IP is to be used, the mobile terminal may not be assigned a HoA in step 406, but directly performs step 407 to perform a proxy mobile IPv6 binding update between the access network and the determined home agent. In the process, the mobile terminal requests a HoA.

It is a matter of course that the invention may be embodied in various other forms without departing from the spirit and scope of the invention.

Industrial Applicability According to the method of the present invention, since the mobile management mode and the contracted mobility management mode of the mobile terminal are comprehensively considered, the mobility management mode capability and policy information of the access network, and the mobility of the home agent are The mobile management mode selects an appropriate mobility management mode for the access terminal. The access terminal can select a suitable mobility management protocol according to its own capabilities and network capabilities to maintain continuity of services.

Claims

Claim

A method for selecting a mobility management mode in a wireless network, which is used in the process of configuring an IPv6 address when the mobile terminal accesses the wireless network, and the method includes the following steps:

(1) The mobile terminal sends a dynamic host configuration protocol discovery message to the access gateway according to a mobility management mode supported by the mobile terminal;

(2) the access gateway selects the mobility management mode for the mobile terminal according to the received dynamic host configuration protocol discovery message;

(3) The access gateway sends the selected mobility management mode to the mobile terminal.

2. The method of claim 1 wherein:

During the mobile terminal access authentication process, the mobile terminal is assigned a home agent, and the home agent is a home agent list composed of one or more home agents;

3. The method of claim 2, wherein:

In the mobile terminal access authentication process, the subscription mobile management mode of the mobile terminal and the mobility management mode supported by the home agent allocated to the mobile terminal are sent to the access gateway.

4. The method of claim 3 wherein:

In step (2), the access gateway is configured according to a mobility management mode supported by the mobile terminal, a mobility management mode supported by the access gateway, a subscription mobility management mode of the mobile terminal, and a home agent assigned to the mobile terminal. A supported mobility management mode to select the mobility management mode for the mobile terminal.

5. The method of claim 1 wherein:

In step (1), if the mobility management mode supported by the mobile terminal and desired to be used is Mobile IPv6, adding a home network identity option of the mobile terminal in the dynamic host configuration protocol discovery message; If the dynamic host configuration protocol discovery message received by the access gateway carries the home network identifier of the mobile terminal, the mobile terminal is considered to support mobile IPv6, otherwise the mobile terminal is considered to support proxy mobile IPv6.

6. The method of claim 4 or 5, characterized by:

In step (1), if the mobile terminal subscribes to a mobile management mode and the mobile terminal supports mobile

IPv6, the access network preferentially selects the mobile IPv6, and the home agent list supporting the mobile IPv6 is in the candidate home agent list, and the access gateway selects the mobile IPv6 as the mobile management mode of the mobile terminal;

If the mobile terminal subscribes to the mobility management mode and the mobile terminal supports the proxy mobile IPv6, the access network preferentially selects the proxy mobile IPv6, and the home agent list in the candidate home agent list supports the home agent of the proxy mobile IPv6. And the access network selects the proxy mobile IPv6 as a mobility management mode of the mobile terminal.

7. The method of claim 6 wherein:

If the access gateway does not receive the subscription mobility management mode of the mobile terminal sent by the mobile terminal and the mobility management mode supported by the home agent allocated to the mobile terminal, if the mobile terminal supports mobile IPv6 And the access network preferentially selects the mobile IPv6, the access gateway selects the mobile IPv6 as the mobile management mode of the mobile terminal; if the mobile terminal supports the proxy mobile IPv6, and the access network preferentially selects the proxy mobile IPv6, the access gateway selects a proxy mobile IPv6 as a mobility management mode of the mobile terminal.

8. The method of claim 7 wherein:

In step (3), the access gateway further determines, for the mobile terminal, a home agent whose supported mobility management mode is consistent with the selected mobility management mode.

9. The method of claim 1 wherein:

In step (3), the access network informs the mobile terminal of the selected mobility management mode by adding a home agent option to the dynamic host configuration protocol response message;

If the home agent option is added in the dynamic host configuration protocol response message, the selected mobility management mode is mobile IPv6, otherwise the selected mobility management mode is proxy mobile IPv6;

The home agent option includes an IPv6 address of the home agent.

10. The method of claim 2 wherein:

The access network notifies the mobile terminal to configure an IPv6 address through a dynamic host configuration protocol through a route advertisement message.