CN101047997B - System and method for implementing dynamic host configuration across sites - Google Patents

Abstract

The invention discloses a system and method for realizing dynamic host configuration across sites, comprising: an access point located in a service site of a mobile terminal, a dynamic host configuration functional entity of the service site, and a dynamic host configuration entity of a target site located in a target site of a mobile terminal The host configuration functional entity and the dynamic host configuration server, the mobile terminal performs message interaction through the service site dynamic host configuration functional entity in its service site and the target site dynamic host configuration functional entity in the target site and the dynamic host configuration server to complete Dynamic host configuration process. The present invention can provide preconditions for cross-site operations that need address configuration through DHCPv6, thereby ensuring effective configuration of mobile terminal addresses in mobile IP.

Description

System and method for implementing dynamic host configuration across sites

technical field

The invention relates to the technical field of network communication, in particular to a system and method for realizing dynamic host configuration across sites.

Background technique

Currently, with the rapid development of mobile and broadband technologies, the demand for IP addresses has increased dramatically. In order to solve the limitation of IPv4 address resource shortage on the application of IP technology, IPv6 increases the length of the original IPv4 address from 32 bits to 128 bits, and also adopts hierarchical address mode, high-efficiency IP header, quality of service, automatic host address configuration, and authentication. and encryption technologies.

Among them, in order to realize that the mobile station can still communicate with the outside world smoothly while moving, the MIP (Mobile IP, Mobile IP) technology is adopted. The basic principle is: In addition to having a fixed IP address, namely HoA (Home Address, home address), the mobile station also has a temporary IP address, namely CoA (Care-of Address, care-of address) in the foreign network to which it has recently moved. , and through a certain network mechanism to establish the corresponding relationship between the HoA address and the CoA address, and the routing relationship between the home network and the foreign network, so that the mobile station will not interrupt the CN (core network) located in other networks when its network changes communication between.

MIPv6 (Mobile IP version 6) is a mobile IP technology based on the IPv6 protocol. It does not require foreign agents, supports route optimization, avoids circuitous routes, and makes full use of the neighbor discovery function and IPv6 extension header. The working principle of IPv6 is shown in Figure 1:

(1) The mobile station determines the current location through the IPv6 router announcement message;

(2) The mobile station uses the IPv6 address automatic configuration mechanism (or other possible mechanisms) to obtain the configuration CoA of the foreign link;

(3) The mobile station logs in to the home agent and notifies its CoA;

(4) The mobile station also notifies some communication peers of its CoA;

(5) Other hosts can ignore the CoA of the mobile station, and like mobile IPv4, send the packet to the local network of the mobile station, and the home agent forwards the packet to the care-of address of the mobile station through the tunnel;

(6) The communication host that knows the mobile station's care-of address can also use the IPv6 routing extension header to directly send the packet to the mobile station;

(7) The mobile station uses the CoA address as the source address when sending data packets.

It can be seen from the above process that in order to ensure the normal communication of the mobile station when it roams between subnets, it is necessary to assign an effective CoA address to the mobile station located in the foreign network.

In MIPv6, the CoA address can obtain its relevant information through automatic configuration. The automatic configuration methods are divided into the following two types:

1. Stateless automatic configuration: The IP address and configuration information of the CoA are obtained by combining the network prefix and interface identifier received in the router advertisement.

2. Stateful automatic configuration: Obtain IP address and configuration information based on DHCPv6 (Dynamic Host Configuration Protocol version 6) process.

Stateful autoconfiguration and stateless autoconfiguration are complementary. For example, stateless autoconfiguration can be used to obtain the CoA address, and stateful autoconfiguration can be used to obtain CoA configuration information, that is, hybrid configuration.

Currently, the message flow in host configuration through DHCPv6 is shown in Figure 2:

The DHCPv6 messages from left to right in the figure may include:

1. SOLICIT (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

2. REQUEST (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

3. CONFIRM (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

4. RENEW (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

5. REBIND (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

6. RELEASE (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

7. DECLINE (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

8. INFORMATION-REQUEST (DHCPv6 client->DHCPv6 server/DHCPv6 relay agent);

9. RELAY-FORW (DHCPv6 relay agent->DHCPv6 server/DHCPv6 relay agent).

In the above message: when the message sent to the DHCPv6 server/DHCPv6 relay agent from the DHCPv6 client is multicast (multicast) (except that the DHCPv6 client has already learned the unicast address (unicast) of the DHCPv6 server), its message The destination address is All_DHCP_Relay_Agents_and_Servers(FF02::1:2), which is a link-local multicast address. When the message sent from the DHCPv6 relay agent to the DHCPv6 server/DHCPv6 relay agent is multicast (except that the DHCPv6 relay agent has already configured the unicast address of the DHCPv6 server), the destination address of the message is All_DHCP_Servers (FF05: :1:3), is a site-scoped multicast address.

The DHCPv6 messages from right to left in the figure may include:

1. ADVERTISE (DHCPv6 server -> DHCPv6 client);

2. REPLY (DHCPv6 server -> DHCPv6 client);

3. RECONFIGURE (DHCPv6 server->DHCPv6 client/DHCP relay agent);

4. RELAY-REPL (DHCPv6 server/relay agent -> DHCPv6 relay agent).

All of the above messages are transmitted in a unicast (unicast) manner.

It can be known from the above that when the DHCPv6 client uses the DHCPv6 process to configure the host, the DHCPv6 server must be located in the same site. However, due to the use of MIPv6, the DHCPv6 client may need to use the DHCPv6 process to perform address configuration across sites. In the stateful hybrid mode, the CoA address of the target network to be handed over is configured in the service network (the target network and the service network are not in the same site). However, there is currently no effective solution for implementing DHCPv6 across sites.

Contents of the invention

The main purpose of the present invention is to provide a system for realizing dynamic host configuration across sites, and provide system support for the DHCPv6 process across sites.

Another object of the present invention is to provide a method for cross-site dynamic host configuration, which provides preconditions for cross-site operations that require address configuration through DHCPv6, thereby ensuring effective configuration of mobile terminal addresses in mobile IP.

For this reason, the present invention provides following technical scheme:

A system for realizing dynamic host configuration across sites, said system comprising: an access point located in a service site of a mobile terminal, a dynamic host configuration function entity of the service site, and a dynamic host configuration function of the target site located in a target site of the mobile terminal Entity, dynamic host configuration server, the service site dynamic host configuration functional entity in the service site and the target site dynamic host configuration functional entity in the target site use the extended DHCPv6 protocol to the mobile terminal and the dynamic host configuration server located in the target site The DHCPv6 messages exchanged between are forwarded to complete the dynamic host configuration process.

The dynamic host configuration functional entity of the service site and the dynamic host configuration functional entity of the target site exchange messages through the extended DHCPv6 protocol.

A method for implementing dynamic host configuration across sites, the method comprising:

A. Set the service site dynamic host configuration functional entity and the target site dynamic host configuration functional entity respectively in the service site and the target site of the mobile terminal;

B. When the mobile terminal needs to perform a dynamic host configuration process across sites, the dynamic host configuration functional entity in the service site and the dynamic host configuration functional entity in the target site will perform dynamic host configuration on the mobile terminal and the dynamic host in the target site through the extended DHCPv6 protocol. The DHCPv6 messages exchanged between the host configuration servers are forwarded to complete the dynamic host configuration process.

The process that the mobile terminal needs to perform dynamic host configuration across sites includes: an address configuration process, and/or an address update process, and/or an address reconfiguration process.

When the mobile terminal needs to perform an address configuration process across sites, the dynamic host configuration functional entity of the service site and the dynamic host configuration functional entity in the target site perform the message exchange between the mobile terminal and the dynamic host configuration server located in the target site The forwarding steps include:

B1. The mobile terminal obtains the location information of the dynamic host configuration function entity of the service site, and the location information is specifically the dynamic host configuration protocol unique identification DUID or IP address of the dynamic host configuration function entity of the service site;

B2. Send the DHCPv6 message to the service site dynamic host configuration functional entity according to the location information;

B3. After receiving the DHCPv6 message, the service site dynamic host configuration functional entity extracts the information of the target site to be configured in the message, and sends the DHCPv6 message to the target site dynamic host according to the information. configuration functional entity;

B4. The dynamic host configuration functional entity of the target site multicasts the received DHCPv6 message to the dynamic host configuration server.

The step of sending the DHCPv6 message to the service site dynamic host configuration functional entity according to the location information includes:

The mobile terminal multicasts a DHCPv6 message to all dynamic host configuration relay agents and servers, and carries the DUID identification information, information indicating the cross-site dynamic host configuration process, and target network related information in the message.

The step of sending the DHCPv6 message to the service site dynamic host configuration functional entity according to the location information includes:

The mobile terminal unicasts a DHCPv6 message to the IP address of the dynamic host configuration functional entity at the service site, and carries information indicating the cross-site dynamic host configuration process and target network related information in the message.

The service site dynamic host configuration functional entity sends the DHCPv6 message to the target site dynamic host configuration functional entity through the extended DHCPv6 protocol.

When the mobile terminal needs to perform an address configuration process across sites, the dynamic host configuration functional entity of the service site and the dynamic host configuration functional entity in the target site perform the message exchange between the mobile terminal and the dynamic host configuration server located in the target site The forwarding steps further include:

After the dynamic host configuration server receives the message of the mobile terminal sent by the dynamic host configuration functional entity of the target site, the DHCPv6 message that needs to be responded is sent to the dynamic host configuration functional entity of the target site;

The target site dynamic host configuration functional entity extracts the information of the service site to be cross-site dynamic host configuration in the message, and sends the DHCPv6 message that needs to be responded to the service site dynamic host configuration functional entity according to the information;

The dynamic host configuration functional entity of the service site analyzes the received message, extracts the response message from the dynamic host configuration server, and sends it to the mobile terminal.

The dynamic host configuration functional entity of the target site sends the DHCPv6 message requiring a response to the dynamic host configuration functional entity of the service site through the extended DHCPv6 protocol.

Said step B further comprises:

The dynamic host configuration relay agent transmits the response message of the dynamic host configuration server sent by the dynamic host configuration functional entity of the service site to the mobile terminal.

As can be seen from the technical scheme provided by the present invention above, the present invention sets the dynamic host configuration functional entity of the service site and the dynamic host configuration functional entity of the target site respectively in the service site and the target site of the mobile terminal. During the host configuration process, the dynamic host configuration functional entity in the service site and the dynamic host configuration functional entity in the target site can forward the interactive messages between the mobile terminal and the dynamic host configuration server located in the target site, and complete the dynamic host configuration process . Therefore, a precondition is provided for cross-site operations that need to perform address configuration and other processes through DHCPv6, and the configuration of the mobile terminal address in the mobile IP is effectively realized. The dynamic host configuration functional entity of the service site and the dynamic host configuration functional entity of the target site in the present invention can exchange messages through the extended DHCPv6 protocol, and can also interact through other messages, which further facilitates the application of the system in different networks.

Description of drawings

FIG. 1 is a schematic diagram of the working principle of MIPv6 in the prior art;

Fig. 2 is a message flow chart in the host configuration through DHCPv6 in the prior art;

Fig. 3 is a schematic diagram of networking of the system of the present invention;

Fig. 4 is the flow chart of message interaction between each functional entity in the system of the present invention;

Fig. 5 is the implementation flowchart of an embodiment of the inventive method;

FIG. 6 is a flow chart of the present invention performing HoA address configuration in the cross-site DHCPv6 process in the WiMAX system.

Detailed ways

The core of the present invention is to respectively set the service site dynamic host configuration functional entity and the target site dynamic host configuration functional entity in the service site of the mobile terminal and the target site; when the dynamic host configuration process needs to be carried out across sites, the service site The dynamic host configuration functional entity and the dynamic host configuration functional entity in the target site forward the interactive messages between the mobile terminal and the dynamic host configuration server located in the target site, and complete the dynamic host configuration process.

Those skilled in the art know that DHCP (Dynamic Host Configuration Protocol) is used for efficient dynamic IP address allocation. The DHCP protocol is based on a general client (client)/server (server) model, that is, the client initiates a request message, and the server returns a corresponding response message. The client here is an ordinary computer, and the server is a DHCP server. When the computer starts or applies for an address, it sends an address application message to the DHCP server. The DHCP server automatically specifies an IP address and other network parameters for the client, and sends a response message.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

With reference to Fig. 3, Fig. 3 has shown the networking structure of the system of the present invention;

The system includes: an access point S11 located in the service site of the mobile terminal, a dynamic host configuration function entity S12 of the service site, a target site dynamic host configuration function entity S22 located in the target site of the mobile terminal, and a dynamic host configuration server S21.

When the mobile terminal S0 needs to perform a cross-site DHCPv6 process, for example, during fast handover, the mobile terminal compares the prefix of the received network prefix of the target access router with the prefix of the currently used serving access router network, and if the target The access router and the service access router are not in the same site, and the stateful or stateless/stateful hybrid address auto-configuration is required according to the address configuration indication information, and the cross-site DHCPv6 process is required.

In this process, the mobile terminal accesses the service site through the access point S11, and sends a message to the dynamic host configuration server S21. Since the target access router and the serving access router are located in different sites, if the DHCPv6 message is directly sent to the dynamic host configuration server S21, the message cannot reach the destination. In the system of the present invention, the service site dynamic host configuration functional entity S12 in its service site and the target site dynamic host configuration functional entity S22 in its target site are responsible for the messages that need to be transmitted between the mobile terminal S0 and the dynamic host configuration server S21 Make a retweet to complete the process.

The DHCPv6 message sent by the mobile terminal S0 may carry information indicating that the mobile terminal needs to perform a cross-site DHCPv6 process and related information of the target site. After receiving the message, the service site dynamic host configuration functional entity S12 can forward the DHCPv6 message to the target site dynamic host configuration functional entity S22 in the corresponding target site according to the information, and then the target site dynamic host configuration functional entity S22 Send it to the dynamic host configuration server S21.

After receiving the DHCPv6 message of the mobile terminal S0, the dynamic host configuration server S21 responds to the message. Similarly, the message is first sent to the target site dynamic host configuration functional entity S22, and then the target site dynamic host configuration functional entity S22 forwards the message to the service site dynamic host configuration functional entity S12. The service site dynamic host configuration function entity S12 extracts the response information and sends it to the mobile terminal.

The DHCPv6 message sent by the mobile terminal S0 can be forwarded to the service site dynamic host configuration function entity S12 through the DHCPv6 relay agent in the site according to different sending methods, or can directly reach the service site dynamic host configuration function entity S12. Similarly, the DHCPv6 message responded by the dynamic host configuration server S21 forwarded by the dynamic host configuration function entity S12 of the service site can be forwarded to the mobile terminal S0 through the DHCPv6 relay agent in the site, or directly sent to the mobile terminal S0 according to the different sending methods. Terminal S0.

Similarly, the message transfer between the target site dynamic host configuration functional entity S22 and the dynamic host configuration server S21 in the target site can also be forwarded through the DHCPv6 relay agent in the site.

According to application requirements, the dynamic host configuration function entity S12 of the service site and the dynamic host configuration function entity S22 of the target site can exchange messages through the extended DHCPv6 protocol, or use other dedicated protocols for interaction.

Fig. 4 shows the message interaction process between each functional entity in the system of the present invention:

1. The MS (mobile terminal) discovers that the DHCPv6 process needs to be performed across sites (such as in MIPv6 fast handover) through the link layer or IP layer mechanism.

2. The MS multicasts the required DHCPv6 message to All_DHCP_Relay_Agents_and_Servers (FF02::1:2), in which the MS indicates that it will perform a cross-site DHCPv6 process and the relevant information of the target site.

The DHCPv6 messages involved include:

A) SOLICIT message

B) REQUEST message

C) CONFIRM message

D)RENEW message

E) REBIND message

F) RELEASE message

G) DECLINE message

H) INFORMATION-REQUEST message

The MS may also not send the above message to the DHCPv6 functional entity of the service site through the DHCPv6 relay. At this time, the function needs to be located on the same link as the MS, and added to the All_DHCP_Relay_Agents_ana_Servers (FF02::1:2) address; or the MS has already known the address of the functional entity, and sends the above message directly to the functional entity. In this case, step 3 is omitted.

3. After receiving the message, the DHCPv6 relay agent finds that it is a DHCPv6 message that requires a cross-site DHCPv6 process. The relay agent submits it to the DHCPv6 functional entity in the above service site.

4. The DHCPv6 functional entity in the above service site parses the received DHCPv6 message, extracts the information of the target site to perform the cross-site DHCPv6 process, and sends the DHCPv6 message through but not limited to DHCPv6 protocol extension based on this information to the corresponding DHCPv6 functional entity in the target site.

5. After receiving the above message, the DHCPv6 functional entity in the target network strips the DHCPv6 message, and multicasts the message to All_DHCP_Relay_Agents_and_Servers (FF02::1:2).

6. Before the message reaches the DHCPv6 server, it can be relayed by the DHCPv6 relay agent (the DHCPv6 server and the target site DHCPv6 functional entity are not on the same link at this time).

7. The above message reaches the DHCPv6 server in the target site, and the DHCPv6 server responds with the corresponding DHCPv6 message, and sends the response message to the DHCPv6 relay agent that relays the message to it.

The messages responded by the DHCPv6 server include:

A) ADVERTISE message

B) REPLY message

C) RECONFIGURE message

D) RELAY-REPL message

Among them, the two messages A and B will be responded by the DHCPv6 server when the DHCPv6 server and the DHCPv6 functional entity of the target site are on the same link; the C message may be directly initiated by DHCPv6 without performing steps 1-6; the D message The DHCPv6 server will respond when the DHCPv6 server and the DHCPv6 functional entity of the target site are not on the same link.

8. The response message from the DHCPv6 server may be relayed by the DHCPv6 relay agent when it reaches the target site (at this time, the DHCPv6 server and the DHCPv6 functional entity of the target site are not on the same link).

9. The DHCPv6 functional entity in the target site parses the received DHCPv6 message, and sends the message to the corresponding DHCPv6 functional entity in the service site through but not limited to DHCPv6 protocol extension.

10. The DHCPv6 functional entity of the service site parses the received message, extracts the response message from the DHCPv6 server, and sends it to the DHCPv6 relay agent.

According to the corresponding situation in step 2, the service site DHCPv6 functional entity can directly send the extracted DHCPv6 message to the MS, thereby omitting step 10.

11. After receiving the message, the DHCPv6 relay agent relays it to the MS.

With the system of the present invention, various DHCPv6 processes such as cross-site address configuration, address reconfiguration, and address update can be performed.

Based on this system, taking cross-site address configuration as an example, the process of the method for implementing cross-site dynamic host configuration in the present invention will be further described in detail.

Referring to the implementation process of an embodiment of the method of the present invention shown in Figure 5, it may include the following steps:

Step 501: Set up a service site dynamic host configuration functional entity and a target site dynamic host configuration functional entity in the service site and the target site of the mobile terminal respectively.

Step 502: The mobile terminal obtains location information of the service site dynamic host configuration functional entity, and the location information is specifically the DUID identifier or IP address of the service site dynamic host configuration functional entity.

Step 503: Send the DHCPv6 message to the dynamic host configuration function entity of the service site according to the location information.

If the location information obtained by the mobile terminal is the DUID of the dynamic host configuration functional entity, the mobile terminal can multicast a DHCPv6 message to all dynamic host configuration relay agents and servers, and carry the DUID identification information and indicate the Information on the cross-site dynamic host configuration process.

If the mobile terminal obtains the IP address of the dynamic host configuration functional entity, the mobile terminal can directly unicast a DHCPv6 message to the IP address of the dynamic host configuration functional entity at the service site, and carry an indication in the message to perform cross-site dynamic host configuration process information.

Step 504: After receiving the DHCPv6 message, the service site dynamic host configuration functional entity extracts the information of the target site to perform cross-site dynamic host configuration in the message, and sends the DHCPv6 message to the target site for dynamic host configuration according to the information functional entity.

The service site dynamic host configuration functional entity may send the DHCPv6 message to the target site dynamic host configuration functional entity through the extended DHCPv6 protocol or other protocols.

Step 505: The dynamic host configuration functional entity of the target site multicasts the received DHCPv6 message to the dynamic host configuration server.

Step 506: After receiving the message of the mobile terminal sent by the dynamic host configuration functional entity of the target site, the dynamic host configuration server sends the DHCPv6 message to be responded to the dynamic host configuration functional entity of the target site.

Step 507: The target site dynamic host configuration functional entity extracts the information of the service site that needs to perform cross-site dynamic host configuration in the message, and sends the DHCPv6 message that needs to be responded to the service site dynamic host configuration functional entity according to the information.

Similarly, the dynamic host configuration functional entity at the target site may send the DHCPv6 message that needs to be responded to the dynamic host configuration functional entity at the service site through the extended DHCPv6 protocol or other protocols.

Step 508: The dynamic host configuration functional entity of the service site parses the received message, extracts the response message from the dynamic host configuration server, and sends it to the mobile terminal.

In the above process, the message interaction between the mobile terminal and the dynamic host configuration functional entity of the service site, and the message interaction between the dynamic host configuration functional entity of the target site and the dynamic host configuration server can be relayed through the DHCPv6 relay agent. .

The interaction process between the service site dynamic host configuration functional entity and the target site dynamic host configuration functional entity in the DHCPv6 process such as address reconfiguration and address update is similar to the above, and will not be repeated here.

The present invention is applicable to various communication systems that perform the DHCHv6 process across sites, such as WiMAX (Worldwide Interoperability for Microwave Systems) systems, 3GPP, 3GPP2, and future B3G systems.

The following takes the WiMAX system as an example to illustrate the way of configuring the HoA (home address) address by using the DHCPv6 process across sites.

Referring to the process shown in Figure 6, it includes the following steps:

1. The MS intends to configure its HoA address through DHCPv6 (stateful mode), but the MS's home network and the MS's current visited network are not located under the same site. The MS multicasts a DHCPv6 Solicit message to All_DHCP_Relay_Agents_and_Servers (FF02::1:2), and indicates in the message that it intends to perform a cross-site DHCPv6 process (configure its HoA address) and information about the home network.

2. After receiving the message, the DHCPv6 relay agent finds that it is a DHCPv6 message that needs to perform a cross-site DHCPv6 process. The relay agent submits it to the DHCPv6 functional entity in the service site (at this time, the DHCPv6 server of the visited network and the DHCPv6 functional entity of the visited network are not on the same link).

3. The DHCPv6 functional entity in the service site parses the received DHCPv6 message, extracts the information of the home network where the cross-site DHCPv6 process is to be performed, and sends this information to the home network through but not limited to DHCPv6 protocol extensions Corresponding DHCPv6 functional entity.

4. After the DHCPv6 functional entity in the home network receives the message sent in step 3, it strips the DHCPv6 Solicit message and multicasts the message to All_DHCP_Relay_Agents_and_Servers (FF02::1:2).

5. Before the message reaches the DHCPv6 server of the home network, it may be relayed by the DHCPv6 relay agent of the home network (at this time, the DHCPv6 server of the home network is not on the same link as the DHCPv6 functional entity of the home network).

6. When the DHCP Solicit message reaches the DHCPv6 server in the home network, the DHCPv6 server that can configure the HoA service for the MS responds to this message, and replies to the MS by including its own information (location information, performance information, etc.) in the DHCPv6 Advertise message.

7. When the DHCPv6 Advertise message reaches the home network, it can be relayed by the DHCPv6 relay agent.

8. The DHCPv6 functional entity in the home network parses the received DHCPv6 Solicit message, and sends this information to the corresponding DHCPv6 functional entity in the service site through but not limited to DHCPv6 protocol extension.

9. The DHCPv6 functional entity of the service site parses the received message, extracts the DHCPv6Advertise message, and sends it to the DHCPv6 relay agent.

10. After receiving the message, the DHCPv6 relay agent relays it to the MS.

11. If more than one DHCPv6 of the home network replies to the MS, the MS selects a DHCPv6 server through the parameters of the DHCPv6 server included in the received DHCPv6 Solicit message. And send a DHCPv6 Request message to it to request it to issue HoA-related information, and the MS needs to indicate in the message that it will perform a cross-site DHCPv6 process (configure its HoA address), and the relevant information of the home network.

12. After receiving the message, the DHCPv6 relay agent finds that it is a DHCPv6 message that requires a cross-site DHCPv6 process. The relay agent submits it to the DHCPv6 functional entity in the service site (at this time, the DHCPv6 server of the visited network and the DHCPv6 functional entity of the visited network are not on the same link).

13. The DHCPv6 functional entity in the service site parses the received DHCPv6 message, extracts the information of the home network where the cross-site DHCPv6 process is to be performed, and sends this information to the home network through but not limited to DHCPv6 protocol extensions Corresponding to the DHCPv6 functional entity.

14. After the DHCPv6 functional entity in the home network receives the message sent in step 13, it strips the DHCPv6 Request message and multicasts the message to All_DHCP_Relela_Agents_and_Servers (FF02::1:2).

15. Before the message reaches the DHCPv6 server of the home network, it can be relayed by the DHCPv6 relay agent of the home network (at this time, the DHCPv6 server of the home network and the DHCPv6 functional entity of the home network are not on the same link).

16. The DHCP Request message arrives at the DHCPv6 server in the home network, and the DHCPv6 server configures HoA for the MS, and includes it in the DHCPv6Reply message and replies to the MS.

17. The DHCPv6Reply message may be relayed by the DHCPv6 relay agent when it reaches the home network (at this time, the home DHCPv6 server and the home network DHCPv6 functional entity are not on the same link).

18. The DHCPv6 functional entity in the home network parses the received DHCPv6 Reply message, and sends this information to the corresponding DHCPv6 functional entity in the service site through but not limited to DHCPv6 protocol extension.

19. The service site DHCPv6 functional entity parses the received message, extracts the DHCPv6Reply message, and sends it to the DHCPv6 relay agent.

20. After the DHCPv6 relay agent receives the message, it relays it to the MS. After the MS receives the DHCPv6Reply message, it extracts the corresponding HoA-related information from the message and configures its own HoA.

While the invention has been described by way of example, those skilled in the art will appreciate that there are many variations and changes to the invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and changes without departing from the spirit of the invention.

Claims (10)

1. the system of a cross-site realization DynamicHost configuration, it is characterized in that, described system comprises: the access point that is positioned at the services sites of portable terminal, services sites DynamicHost configuration feature entity, be positioned at the targeted sites DynamicHost configuration feature entity of the targeted sites of portable terminal, dynamic host configuration server, services sites DynamicHost configuration feature entity and the targeted sites DynamicHost configuration feature entity in the targeted sites in the described services sites are transmitted DHCPv6 message mutual between portable terminal and the dynamic host configuration server in targeted sites by the DHCPv6 agreement of expansion, finish dynamic host configuration procedure.

2. the method for a cross-site realization DynamicHost configuration is characterized in that described method comprises:

A, services sites DynamicHost configuration feature entity and targeted sites DynamicHost configuration feature entity are set respectively in the services sites of portable terminal and in the targeted sites;

B, need cross-site carry out dynamic host configuration procedure the time when portable terminal, DHCPv6 message mutual between portable terminal and the dynamic host configuration server in targeted sites is transmitted by the DHCPv6 agreement of expansion by the DynamicHost configuration feature entity in described services sites DynamicHost configuration feature entity and the targeted sites, finished dynamic host configuration procedure.

3. method according to claim 2 is characterized in that, described portable terminal needs cross-site process of carrying out the DynamicHost configuration to comprise: address configuration process and/or address renewal process and/or address reconfiguration course.

4. method according to claim 3, it is characterized in that, when portable terminal need cross-sitely carry out the address configuration process, the step that the DynamicHost configuration feature entity in described services sites DynamicHost configuration feature entity and the targeted sites is transmitted interactive messages between portable terminal and the dynamic host configuration server in targeted sites comprised:

B1, portable terminal obtain services sites DynamicHost configuration feature entity locating information, and described locating information is specially the DHCP unique identification DUID or the IP address of services sites DynamicHost configuration feature entity;

B2, DHCPv6 message is sent to services sites DynamicHost configuration feature entity according to described locating information;

After B3, services sites DynamicHost configuration feature entity are received described DHCPv6 message, extract the information of the targeted sites that will carry out cross-site DynamicHost configuration in this message, and described DHCPv6 message is sent to targeted sites DynamicHost configuration feature entity according to this information;

B4, targeted sites DynamicHost configuration feature entity send to dynamic host configuration server with the DHCPv6 message multicast of receiving.

5. method according to claim 4 is characterized in that, describedly according to locating information the step that DHCPv6 message sends to services sites DynamicHost configuration feature entity is comprised:

Portable terminal sends DHCPv6 message to all DynamicHosts configuration relay agents and server multicast, and carries described DUID identification information in this message, show information, the objective network relevant information of carrying out cross-site dynamic host configuration procedure.

6. method according to claim 4 is characterized in that, describedly according to locating information the step that DHCPv6 message sends to services sites DynamicHost configuration feature entity is comprised:

Portable terminal sends DHCPv6 message to the clean culture of the IP address of services sites DynamicHost configuration feature entity, and carries in this message and show information, the objective network relevant information of carrying out cross-site dynamic host configuration procedure.

7. method according to claim 4 is characterized in that,

Services sites DynamicHost configuration feature entity sends to targeted sites DynamicHost configuration feature entity by the DHCPv6 agreement of expansion with described DHCPv6 message.

8. according to claim 2 or 4 described methods, it is characterized in that, when portable terminal need cross-sitely carry out the address configuration process, the step that the DynamicHost configuration feature entity in described services sites DynamicHost configuration feature entity and the targeted sites is transmitted interactive messages between portable terminal and the dynamic host configuration server in targeted sites further comprised:

After dynamic host configuration server was received the message of the portable terminal that targeted sites DynamicHost configuration feature entity transmits, the DHCPv6 message that needs are responded sent to targeted sites DynamicHost configuration feature entity;

Targeted sites DynamicHost configuration feature entity extraction goes out the information of the services sites that will carry out cross-site DynamicHost configuration in this message, and the DHCPv6 message of described needs being responded according to this information sends to services sites DynamicHost configuration feature entity;

Services sites DynamicHost configuration feature entity is resolved the message of receiving, extracts receiveing the response of dynamic host configuration server, sends to portable terminal.

9. method according to claim 8 is characterized in that,

Targeted sites DynamicHost configuration feature entity sends to services sites DynamicHost configuration feature entity by the DHCPv6 agreement of expansion with the described DHCPv6 message that needs to respond.

10. method according to claim 8 is characterized in that, described step B further comprises:

Relay agent sends the receiveing the response of dynamic host configuration server that services sites DynamicHost configuration feature entity sends to portable terminal by the DynamicHost configuration.

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