WO2007036098A1

WO2007036098A1 - A communication method between mobile nodes and a mobile node

Info

Publication number: WO2007036098A1
Application number: PCT/CN2006/001037
Authority: WO
Inventors: Yuzhi Ma
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-09-29
Filing date: 2006-05-19
Publication date: 2007-04-05
Also published as: CN1942003A

Abstract

A communication method between mobile nodes and a mobile node are disclosed. The core idea of this method is that: two mobile nodes needing communication transfer the care-of-address (COA) changing information mutually when their COA are in a changing state, and said mobile nodes communicate data packets through the received COA changing information by themselves respectively. A mobile node is also disclosed. The mobile node includes storage module, COA information transmitting module and packets transferring module. With this invention, it could communicate among mobile nodes fast in a route optimization manner, and perfect the mobile IPv6 protocol, optimize the binding update and communication procedure among mobile nodes, thus increase the communication rate among the mobile nodes.

Description

Communication method between mobile nodes and mobile node

The present invention relates to the field of network communication technologies, and in particular, to a communication method and a mobile node between mobile nodes.

Background technique

With the continuous development of network technology, a large number of mobile terminals will appear in the network, and the communication requirements between mobile nodes will also increase. To this end, Mobile IPv6 defines three basic communication entities, namely mobile nodes, home agents, and communication nodes. The mobile node always identifies itself with the home address. When the mobile node is at home, it works in exactly the same way as the fixed node. When the mobile node roams to the foreign link, it needs to be automatically obtained through stateless or stateful mode. The care-of address, and then sends a binding update message to the home agent to register its care-of address, and the mobile node can also send a binding update message to the correspondent node to register its care-of address.

Mobile IPv6 defines the communication between two mobile nodes and communication nodes: One is a two-way tunneling method. In this mode, the data packet sent from the communication node is intercepted by the home agent of the mobile node, and then the mobile agent's home agent forwards the data packet to the mobile node through the tunnel mechanism, and the data packet sent by the mobile node to the communication node passes first. The reverse tunneling mechanism transmits to the mobile node's home agent, and then the mobile agent's home agent sends the data packet to the communication node through normal routing.

The other is route optimization. In this manner, the mobile node is first required to register its care-of address with the correspondent node, after which the data packet between the mobile node and the correspondent node can be directly routed to the destination address without being relayed through the mobile agent's home agent.

According to the definition of mobile IPv6, the communication node can be a fixed node or a mobile node. However, Mobile IPv6 does not separately describe the communication process between two mobile nodes. According to the protocol description of the communication process between the mobile node and the communication node, the communication between the two mobile nodes MN1 and MN2 can be summarized as follows Four ways:

1. When both MN1 and ΜΝ2 are in the home link, their communication process is exactly the same as the communication process between fixed nodes.

2. When MN1 is in the foreign link, and ΜΝ2 is in the home link, the two can move according to the two. The communication process of the node MN1 and the fixed communication node MN2 is processed; and vice versa.

3. When MN1 and MN2 leave the home link one after another and work in tunnel mode, that is, when MN1 and MN2 do not know the other party's care-of address, the communication process between them is as follows: Step A: After MN1 arrives at the foreign link Complete the registration process with your home agent.

Step B: After the MN2 arrives at the foreign link, it completes the registration process to its home agent.

Step C: MN1 sends a data packet to MN2, first through the reverse tunnel to the home agent of MN1, then from the home agent of MN1 to the home agent of MN2, and finally, from the home agent of MN2, to the care-of address of MN2.

Step D: The path in which MN2 sends a packet to MN1 is opposite to the path described in step C above.

4. When MN1 and MN2 leave the home link one after another and work in route optimization mode, the communication process between them is as follows:

Step A: After the MN1 arrives at the foreign link, it completes the registration process with its home agent, and then registers its care-of address with the MN2. At this time, the MN2 establishes a binding cache with the MN1 as the communication node.

Step C: When the MN1 sends a data packet to the MN2, since the MN1's own binding update list has an information entry of the MN2 home address, the MN1 selects the direct routing mode to route the data packet to the home address of the MN2, and then, by the MN2 The home agent transfers to the care-of address of MN2.

Step D: MN2 sends a binding update message to MN1 to register its care-of address. At this time, MN1 and MN2 act as communication nodes of the other party, and establish a binding cache associated with the other party.

Step E: MN1 and MN2 perform routing optimization communication with the care-of address.

As can be seen from the above description, when two mobile nodes successively leave the home link and communication needs to be performed between the two mobile nodes, both nodes act as both a mobile node and a communication node, and the role definition is not Clearly, the relationship between each other is complex and not conducive to the realization of the agreement. When two mobile nodes are in the foreign link and communicate in the third mode, the data packet has to pass through the respective home agents of the two mobile nodes, and the implementation process is complicated, which is easy to cause communication delay. When both mobile nodes are in the foreign link and communicate in mode four, The establishment process of the care-of address binding relationship between two mobile nodes is complicated, which is likely to cause delay packet loss and cannot guarantee the communication quality between mobile nodes.

Summary of the invention

It is an object of the present invention to provide a communication method between mobile nodes to improve communication speed between mobile nodes and to ensure communication quality between mobile nodes.

Another object of the present invention is to provide a mobile node to quickly establish communication with other mobile nodes.

To achieve the above objective, a communication method between mobile nodes provided by the present invention includes: a communication method between mobile nodes, including:

a. Two mobile nodes that need to communicate transmit mutual change information of the care-of address when their respective care-of addresses are in a changed state;

b. The mobile node performs data packet transmission by changing information of its respective received care-of address.

The step a specifically includes:

In two mobile nodes that need to communicate, the mobile node whose care-of address is in the first change state registers the care-of address with the opposite mobile node when its care-of address is in a changed state.

Preferably, the method further comprises:

The mobile node that accepts the mobile node registration care-of address is used as the mobile communication node. The step a further includes:

The mobile communication node determines, when the care-of address thereof is in a changed state, the mobile nodes to which the care-of address is registered according to the binding information in the stored binding update list;

The change information of its care-of address is transmitted to each of the mobile nodes.

Preferably, the mobile communication node transmits the change information of its care-of address to the mobile node through a Binding Refresh Request message.

The method further includes:

A communication node address update option is set in the binding refresh request message.

The mobile communication node transmits the change information of its care-of address to the mobile node in the Binding Refresh Request message carrying the communication node address update option.

Optionally, the change status is: a change has occurred, and the mobile communication node is handed over The address change information includes: address information before the change of the care-of address and address information after the change of the care-of address.

The source address of the binding refresh request message is: address information after the change of the care-of address of the mobile communication node, the destination address is: address information of the mobile node, and the handover of the communication node carrying the mobile in the address update option of the communication node Address information before the address change.

Optionally, the change status is: expected to change, and the change information of the handover address of the mobile communication node includes: current address information of the communication node and expected handover address information of the communication node.

The source address of the binding refresh request message is: the current address of the mobile communication node, the destination address is: address information of the mobile node, and the communication node address update option carries the expected care-of address of the mobile communication node.

The step b specifically includes:

The mobile communication node and the mobile node respectively update the respective binding update list according to the change information of the care-of address received by the mobile node;

The mobile communication node and the mobile node respectively perform packet transmission according to the care-of address in their respective binding update list.

Optionally, the mobile node is: a mobile node in mobile IPv6, or a mobile node in fast handover mobile IPv6, or a mobile node in hierarchical mobile IPv6.

A mobile node, comprising:

a storage module: configured to store a binding update list and node definition information, and update the stored binding update list when the mobile node receives the binding update request transmitted by the opposite mobile node;

The care-of address information sending module is configured to: when the care-of address is in a changed state, transmit the change information of the care-of address to the opposite mobile node;

The data packet transmission module is configured to send a data packet to the peer mobile node according to the binding update list stored in the storage module.

When the mobile node receives the binding update request transmitted by the opposite mobile node, the storage module stores the node definition information as a mobile node whose mobile node is a mobile node. Preferably, the mobile node further includes:

The node definition information acquiring module is respectively connected to the storage module and the care-of address information sending module, and is configured to acquire node definition information stored in the storage module when the care-of address of the mobile node where the mobile node is located is in a changed state, And transmitting it to the care-of address information sending module.

When the care-of address of the mobile node is in a changed state, and the node definition information acquired by the node definition information acquiring module is information that the mobile node is a mobile communication node, the care-of address information sending module will transfer the address The change information is sent to each mobile node to which the care-of address is registered;

When the care-of address of the mobile node is in a changing state, and the node definition information acquired by the node definition information acquiring module is not the information of the mobile node that is the mobile node, the care-of address information sending module will transfer the address The change information is sent to the peer mobile node that needs to communicate with it.

According to the description of the foregoing technical solution, the present invention defines two mobile nodes as a mobile node and a mobile communication node, respectively, and avoids that the mobile node acts as both a mobile node and a communication node when communicating with the opposite mobile node. The role of the role, the role division between the two mobile nodes is clarified; the mobile communication node can transmit the change information of its care-of address to the mobile node in time when its care-of address is changed, so that the mobile node is bound The information can be refreshed in time to ensure that the mobile node and the communication node can communicate quickly through the route optimization method; the mobile communication node transmits the binding refresh request message and transmits the change information of the care-of address to each registered to it. The mobile node enables the mobile communication node to quickly communicate with each mobile node through a route optimization manner, optimizes the binding update process between the mobile nodes, and avoids the phenomenon of delay packet loss as much as possible; The care-of address of the mobile node of the mobile The change status may be that the care-of address has changed, or the transfer address is about to change, so that the present invention can be applied to mobile IPv6, fast handover mobile IPv6, and hierarchical mobile IPv6; thereby improving the mobile IPv6 protocol and optimizing the mobile node. The communication process between the two ends up to improve the communication speed between mobile nodes.

DRAWINGS Figure 1 is a flow chart showing the implementation of the method of the present invention;

2 is a flow chart of message interaction between mobile nodes in mobile IPv6 according to the present invention; FIG. 3 is a flow chart of message interaction between mobile nodes in fast handover mobile IPv6 or hierarchical IPv6 according to the present invention;

4 is a schematic block diagram of a mobile node of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The core of the present invention is that two mobile nodes that need to communicate transmit mutual change information of a care-of address when their respective care-of addresses are in a changed state, and one of the mobile nodes is used as a mobile communication node, and the mobile communication The node and the mobile node transmit data packets through their respective received care-of addresses.

When the care-of address is in a changing state, the two mobile nodes that need to communicate not only need to notify the opposite mobile node of the change information of the care-of address, but also need to perform role assignment, that is, one mobile node takes the role of the communication node and another A mobile node communicates, and during the entire communication process after determining the role, one mobile node always acts as a communication node, and the other mobile node always acts as a mobile node.

The change of the care-of address of the above-mentioned mobile communication node may be caused by the movement of the node, such as the node moving from one link to another, etc.; or may be caused by reconfiguration of the node or the like.

One of the two mobile nodes may be determined as a mobile communication node in the following manner: When the care-of address of one of the mobile nodes is first in a changed state, the mobile node sends a binding update message to another mobile node, The mobile node receiving the binding update message updates the binding relationship in the binding update list stored in the cache according to the binding update message it receives, and returns a binding update response message to the opposite mobile node, so The mobile node receiving the binding update message determines the mobile node as the mobile, and determines the mobile node that sent the binding update message as the mobile node. That is, in the binding relationship, the mobile communication node always acts as a communication node, and in other binding relationships it can also act as a mobile node of other nodes. For example, the mobile node MN1 first initiates a binding update message to the mobile node MN2, and receives the binding response message of the MN2. Thereafter, in the relationship between the two, the MN1 is directly acting as the mobile node, and the MN2 is directly acting as the mobile communication node. . In this way, the present invention defines two mobile nodes as mobile nodes and mobile communication nodes, respectively, so that when the two mobile nodes communicate with each other, their respective roles are clarified, which provides a prerequisite for optimizing the communication process between the two mobile nodes. Condition, so that two mobile nodes can perform corresponding processing operations according to their own roles.

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

Referring to FIG. 1, FIG. 1 shows an implementation flow of the method of the present invention, which includes the following steps: Step 101: Two mobile nodes that need to communicate transmit mutual change information of a care-of address when their respective care-of addresses are in a changed state, and One of the mobile nodes is used as a mobile communication node.

When a mobile node care-of address of the mobile node need to communicate in two first state of change, and only ^N: After the above described two home mobile nodes are assigned the role as care-of address of the mobile communication node is in a state of change When the mobile communication node needs to send the care-of address change information to the mobile node with which it communicates.

The care-of address change information of the mobile communication node can be transmitted through the binding refresh message, so that the mobile communication node can transmit the binding change information stored in the self-binding cache to the address change information through the binding refresh message to Each mobile node to which the care-of address is registered. Thereby, each mobile node to which the care-of address is registered can be made aware of the care-of address change information of the mobile communication node in time.

Step 102: The mobile communication node and the mobile node perform data packet transmission by using change information of their respective received handover addresses.

After receiving the change information of the care-of address of the other party, the mobile communication node and the mobile node update the respective binding update list according to the change information, and perform data packet transmission according to the care-of address in the respective binding update list.

Those skilled in the art will recognize that the mobile headers defined in Mobile IPv6 are primarily used in mobile, communication, and home agents for messaging related to binding creation and management. The format of the moving head is shown in Table 1.

Table 1 :

+—+_+_+_+— +_+_+_+_+—+—+—+_+_+_+—+_+-+-+-+_+_+_+_+_ +_+-+-+-+-+-+-+

I Payload Proto | Header Len | MH Type | Reserved | +-+.+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- +-+-+-+-+-+-+-+

I Checksum |

+.+_+.+-+-+-+-+-+-+-+_+-+-+-+-+-

Message Data

+—+_+_+_+—+_+—+_+_+—+_+_+_+-+_+_+—+—+_+—+_+_+_+_+_ +_+_+_+_+_+_+_+ In Table 1, MHType is used to indicate the type of mobile message. For example, MH Type = 1 indicates that the mobile message is a binding refresh request. Message Data carries different message data according to the MH Type. For example, when MHType=l, Message Data carries a binding refresh request message.

The format of the Binding Refresh Request message defined by Mobile IPv6 is shown in Table 2.

Table 2:

+_+_+_+_+_+_+_+_+_+_+·+_+_+_+-+

I Reserved |

+-+—+—+—+—+—+—+—+-+_+—+_+_+—+_+-+_+_+_+_+_+_+_+—+_ +—+_+-+_+_+_+_+

Mobility options .

I I

+_+_+_+—+_+-+_+_+_+-+_+-+_+-+-+-+-+-+_+_+_+-+_+-+_ +_+-+-+_+_+-+-+ In Table 2, Mobility options are mobile options, and the common format defined by Mobile IPv6 for mobile options is shown in Table 3.

table 3:

0 1 2 3

01234567890123456789012345678901

+—+—+_+_+—+_+_+-+_+-+_+_+-+_+_+_+_+_+_+-+_+-+_+_+_ +—+-+-+-+-+-+-+

I Option Type | Option Length | Option Data...

+—+_+_+_+-+_+_+_+_+-+-+_+_+_+_+-+_+-+_+_+-+-+-+_+_ +-+-+-+-+-+-+-+ In Table 3, Option Type is the move option type, Option Length is the move option length, and Option Data is the move option data.

The present invention newly sets a communication node address according to the general format of the mobile option of Table 3. Update options, the format is shown in Table 4.

Table 4:

0 1 2 3

+.+_+_+.+.+_+-+-+-+-+-+-+-+.+-+-+ I Type = 50 | Length = 16 |

+-+-+-+_+-+_+-+_+-+-+_+_+-+_+-+-+_+_+-+_+_+-+_+-+- +_+_+_+_+_+_+_+

I I

+ +

I I

+ Correspondent Address +

I I

+ + +_+—+— +-+_+_+_+—+— +_+_+—+_+_+_+—+_+_+_+_+_+_+_+_ +_+-+—+— +_+_+_+_+ In Table 4, the Option Type should be set to a value different from the other option types to identify the move option as the communication node address update option, such as Option Type is set to 50, etc. The Correspondent Address is used to carry the address information of the communication node.

In Mobile IPv6, the binding refresh request of the present invention is sent after the handover address of the mobile communication node changes, and the source address of the binding refresh request is the new address information after the handover address of the mobile communication node is changed, and the destination address is The address of the peer mobile node, the mobile communication node address update option carries the old address information before the change of the care-of address of the mobile communication node.

In Mobile IPv6, when the mobile node receives the binding refresh request carrying the communication node address update option, the old address information of the communication node is obtained from the communication node address update option, and then, according to the old address information of the communication node, The binding update list in the self cache matches the old address information of the communication node with the destination address of the binding update message that the mobile node has sent in the binding update list. If there is a matching entry, the mobile node deletes the entry. And according to the new address information of the mobile communication node, that is, the source address in the binding refresh request message, the loop is initiated by the process and the binding update process.

In the fast handover mobile IPv6 or hierarchical mobile IPv6, the binding refresh request of the present invention may also be sent before the handover address of the mobile communication node changes, and the source address of the binding refresh request message is the current address of the mobile communication node. Information, the destination address is the address of the peer mobile node, and the communication node address update option carries the new address expected by the mobile communication node. Information.

In the fast handover mobile IPv6 or the hierarchical mobile IPv6, when the mobile node receives the binding refresh request carrying the communication node address update option, the old address information of the communication node is obtained from the source address of the binding refresh request message, and then Retrieving the binding update list in its own cache according to the old address information of the communication node, and matching the old address information of the communication node with the destination address of the binding update message that the mobile node has sent in the binding update list, if there is a matching table The mobile node deletes the entry and initiates a loop by process and binding update process according to the new address information of the mobile communication node, that is, the address information carried in the communication node address update option.

Through the above process, the mobile node and the mobile communication node can obtain the care-of address change information of the opposite node in time, so that the mobile node and the mobile communication node can quickly communicate through the route optimization manner.

The communication process between the mobile nodes of the present invention will be further described below with reference to FIG. 2 is a flow chart of message interaction between mobile nodes in mobile IPv6 according to the present invention:

Set two mobile nodes that need to communicate as MN1 and MN2.

In step 1-1, after the care-of address of MN1 changes, MN1 registers its care-of address with its home agent, and sends a binding update message to MN2 to register its care-of address with MN2.

After step 1-2, the MN2 receives the binding update message transmitted by the MN1, and establishes its binding relationship with the MN1 as the mobile communication node.

At this time, if the MN1 sends a data packet to the MN2, then to step 1-3-1, since the information entry of the MN2 home address exists in the binding update list of the MN1 itself, the MN1 selects the direct routing mode to route the data packet to the MN2. The home address, then, is transferred from MN2's home agent to MN2.

At this time, if the MN2 transmits a data packet to the MN1, then to step 1-3-2, since the care-of address of the MN1 exists in the binding update list of the MN2 itself, the MN2 selects the direct routing method to directly route the data packet to the MN1.

After the care-of address of MN2 changes, to steps 1-4, MN2 retrieves the information stored in its own binding cache, determines all mobile nodes to which the care-of address is registered, and carries the binding with the communication node address update option. The refresh request is sent to each mobile node, and the binding update request carries the change information of the care-of address of the MN2. The source address of the binding refresh request message is a new address after the change of the care-of address of the MN2, and the destination address is the address of the MN1; The node address update option carries the old address before the change of the care-of address of MN2.

After receiving the binding refresh request message sent by the MN2, the MN1 updates the binding update list stored by itself according to the old address information and the new address information of the MN2 carried in the binding refresh request message. The update detailed process of the binding update list is as described above, and will not be described here.

To step 1 -6, MN1 transmits the data packet that needs to be transmitted to the MN2 according to the care-of address of MN2 by way of route optimization; MN2 transmits the data packet that needs to be transmitted to MN1 according to the handover address of MN1 through route optimization.

FIG. 3 is a flow chart of message interaction between mobile nodes in a fast handover mobile IPv6 or hierarchical IPv6 according to the present invention:

Set two mobile nodes that need to communicate as MN1 and MN2.

In step 2-1, after the care-of address of MN1 changes, MN1 registers its care-of address with its home agent and sends a binding update message to MN2 to register its care-of address with MN2.

Go to step 2-2. After receiving the binding update message transmitted by MN1, MN2 establishes its binding relationship with MN1 as the mobile communication node.

At this time, if the MN1 sends a data packet to the MN2, then to step 2-3-1, since the information entry of the MN2 home address exists in the binding update list of the MN1 itself, the MN1 selects the direct routing mode to route the data packet to the MN2. The home address, then, is transferred from MN2's home agent to MN2.

At this time, if the MN2 transmits a data packet to the MN1, then to step 2-3-2, since the care-of address of the MN1 exists in the binding update list of the MN2 itself, the MN2 selects the direct routing method to directly route the data packet to the MN1.

Before the care-of address of MN2 changes, MN2 generates an expected new address. In steps 2-4, MN2 retrieves the information stored in its own binding cache, determines all mobile nodes to which the care-of address is registered, and carries The binding refresh request of the communication node address update option is sent to each mobile node, and the change information of the care-of address of the MN2 is carried in the binding refresh request. The source address of the binding refresh request message is the current address of the MN2, and the destination address is the address of the MN1; the communication node address update option carries the new address expected by the MN2.

After receiving the binding refresh request message sent by the MN2, the MN1 updates its own stored binding update list according to the old address information and the new address information of the MN2 carried in the binding refresh request message. The update detailed process of the binding update list is as described above, here No longer.

To step 2-6, MN1 transmits the data packet it needs to transmit to the MN2 according to the care-of address of MN2 by way of route optimization; MN2 transmits the data packet it needs to transmit to MN1 according to the care-of address of MN1 through route optimization.

As can be seen from the above description, the MN2 as a mobile communication node can directly communicate with the mobile node MN1 without registering the care-of address information to its home agent, optimizing the communication process and reducing the delay packet loss. possibility.

Referring to Figure 4, there is shown a block diagram of the mobile node of the present invention:

The mobile node SO provided by the present invention includes: a storage module Sl, a care-of address information transmitting module S2, and a data packet transmission module S3.

The storage module S1 is mainly used to store the binding update list and the node definition information, and the storage module S1 updates the stored binding update list when receiving the binding update request transmitted by the opposite mobile node, and defines the node. Information is stored as information about the mobile node where the mobile node is mobile.

The care-of address information sending module is mainly used to send the change information of the care-of address to each mobile node to which the care-of address is registered when the care-of address of the mobile node where the mobile node is located is in a changed state.

The data packet transmission module S3 is mainly configured to determine a care-of address of the opposite mobile node according to the binding update list stored in the storage module, and send the data packet according to the care-of address of the opposite mobile node.

Due to the different roles of mobile nodes in mutual communication, different processing operations are required when their care-of addresses are in a changing state. For example, a mobile node A is a mobile node in communication with the mobile node B, and may be a mobile communication node in communication with the mobile node C. Therefore, the present invention determines its role in the communication process by the node definition information stored in the storage module S1, and the node definition information is determined according to whether the mobile node receives the binding update request of the opposite mobile node. .

In order for the care-of address information transmitting module S2 to notify its all-in-one mobile node of its care-of address change information when its mobile node is in a different role, it may also be between the storage module S1 and the care-of address information transmitting module S2. The node definition information obtaining module S4 is configured to acquire the node definition information stored in the storage module S1 when the care-of address of the mobile node where the mobile node is located is changed, and transmit the node definition information to the care-of address information sending module S2. And the care-of address information transmitting module S2 determines the role of the mobile node in which the mobile node is located in the current communication according to the information, and performs corresponding processing when the mobile node's care-of address processing changes state, as follows:

When the care-of address of the mobile node is in a changed state, and the node definition information acquired by the node definition information acquiring module S4 is information of the mobile node that the mobile node is moving, the care-of address information transmitting module S2 sends the change information of the care-of address to the Registering the mobile node of the care-of address; the care-of address information sending module S2 may determine each mobile node to which the care-of address is registered according to the binding update list stored in the storage module, and the send care-of address change information module may The change information of the care-of address is transmitted to each mobile node. Specifically, it is as described in the above method.

When the care-of address of the mobile node is in a changed state, and the node definition information acquired by the node definition information acquisition module S4 is not the information of the mobile node that the mobile node is moving, the care-of address information transmitting module S2 sends the change information of the care-of address to the The peer mobile node of the communication.

The change of the care-of address of the mobile node described above indicates that it has changed in Mobile IPv6, indicating that the change is expected in Fast Handover Mobile IPv6 or Layered Mobile IPv6.

While the invention has been described by the embodiments of the invention, it will be understood that

Claims

Rights request

A communication method between mobile nodes, comprising:

The method of communicating between mobile nodes according to claim 1, wherein the step a specifically includes:

The method for communicating between mobile nodes according to claim 2, wherein the method further comprises:

The mobile node that accepts the mobile node registration care-of address is used as the mobile communication node.

The method of communicating between mobile nodes according to claim 3, wherein the step a further comprises:

The communication method between mobile nodes according to claim 4, wherein the mobile communication node transmits the change information of its care-of address to the mobile node through a binding refresh request message.

The method for communicating between mobile nodes according to claim 5, wherein the method further comprises:

7. The communication method between mobile nodes according to claim 6, wherein the mobile communication node transmits the change information of its care-of address to the binding refresh request message carrying the communication node address update option to Mobile node.

A communication method between mobile nodes according to claim 7, wherein: said change state is: a change has occurred, and a change of a care-of address of said mobile communication node The information includes: the address information before the change of the care-of address and the address information after the change of the care-of address.

The method for communicating between mobile nodes according to claim 8, wherein: the source address of the binding refresh request message is: address information after the handover address of the mobile communication node is changed, and the destination address And being: the address information of the mobile node, where the communication node address update option carries the address information before the change of the care-of address of the mobile communication node.

The communication method between the mobile nodes according to claim 7, wherein: the change state is: an expected change, and the change information of the care-of address of the mobile communication node includes: The current address information and the expected care-of address information of the communication node. 11. A communication method between mobile nodes according to claim 10, characterized in that:

The method for communicating between the mobile nodes according to claim 1, wherein the step b specifically includes:

The communication method between mobile nodes according to any one of claims 1 to 12, wherein the mobile node is: a mobile node in mobile IPv6, or a fast handover mobile IPv6 The mobile node in the mobile node, or the mobile node in the hierarchical mobile IPv6.

14. A mobile node, comprising:

The care-of address information sending module is configured to: when the care-of address is in a changed state, transmit the change information of the care-of address to the opposite mobile node; The data packet transmission module is configured to send a data packet to the opposite mobile node according to the binding update list stored in the storage module.

15. A mobile node according to claim 14 wherein:

When the mobile node receives the binding update request transmitted by the opposite mobile node, the storage module stores the node definition information as a mobile communication node where the mobile node is located.

The mobile node according to claim 15, wherein the mobile node further comprises:

17. A mobile node according to claim 16 wherein: