WO2010015173A1

WO2010015173A1 - Mobile ip packet transmission method and device

Info

Publication number: WO2010015173A1
Application number: PCT/CN2009/072889
Authority: WO
Inventors: 李春强; 黄志钢; 潘云波; 胡寅亮
Original assignee: 华为技术有限公司
Priority date: 2008-08-07
Filing date: 2009-07-23
Publication date: 2010-02-11
Also published as: CN101645874A; CN101645874B

Abstract

A mobile IP packet transmission method and device are provided. The method comprises: the HA (Home Agent) receives the IP packet communicated between the MN (Mobile Node) and the CN (Correspondent Node), the HA performs an address translation processing to the IP packet according to the associated relation between its stored CN’s address and the corresponding identification and transmits the IP packet to which an address translation processing has been performed to the CN or MN which acts as the receiver of the IP packet. By using the invention it could be realized that the MN does not need to support multiple Care-of-Address function when the MN communicates with multiple CNs. The HA and MN could identify the packet accurately according to the identification corresponding to the CN’s address carried in the received packet.

Description

Mobile IP packet transmission method and device

[1] The present application claims the priority of the Chinese application filed on Aug. 7, 2008, with the application number 2008101118223.2, entitled "Transmission Method Device for Mobile IP Messages", the entire contents of which are incorporated herein by reference. in.

[2] Technical field

[3] The present invention relates to the field of network communications, and in particular, to a method and an apparatus for transmitting a mobile IP packet.

[4] Background of the invention

[5] With the rapid development of computer network technology and mobile communication computing, there is a demand for mobility support. Mobile IPV6 is a solution for mobility at the network layer. There are three basic network entities in mobile IPv6: mobile node (MN, Mobile Node), communication peer (CN, Correspondent)

Node) and home agent (ΗΑ' Home Agent).

[6] In accordance with the Mobile IPv6 specification, the MN does not interrupt its ongoing home address (HoA, Home) while the MN is moving from one link to another.

Address) communication. The mobility of the MN is transparent to the transport layer and other higher layer protocols, and the HoA of a MN can uniquely identify the MN.

[7] After the MN roams to the foreign network, the MN will generate a care-of-ad dress (CoA, Care-of-A ddress) in a certain way, and update through the binding (Binding Update)

, BU) The message informs the MN of the HA of the CoA, and after receiving the BU message, the HA will reply with a binding confirmation (Binding Acknowledge)

, BA) Message to MN. Then, the HA intercepts the packet sent by the CN to the MN's home network and the MN. The format of the packet is as shown in Figure 1. The HA then tunnels the packet to the MN through the tunnel mode. The HA performs the HA. The format of the packet encapsulated by the tunnel is shown in Figure 2. After the MN sends a packet to the CN, the packet is encapsulated in the tunnel mode and then sent to the HA. The format of the packet encapsulated by the MN is as shown in Figure 3. The HA performs the MN on the MN. The packet encapsulated by the tunnel is encapsulated and then forwarded to the CN. The format of the packet after the tunnel is encapsulated by the HA is shown in Figure 4.

[8] The communication method in which the above MN and CN transit through HA is called a bidirectional tunnel communication mode, in this two-way In the tunnel communication mode, data packets that communicate with the MN are encapsulated in a tunnel. A 40-byte header is required in the IPv6 tunnel encapsulation. The packet format of an IPv6 tunnel encapsulation is shown in Figure 5. In Figure 5, oSRC is the outer head source address, oDEST

For the destination address of the outer header, oNAF is the non-address field in the outer header, iSRC is the inner header source address, iD EST is the inner header address, and iNAF is the non-address field in the inner header.

The 40-byte header in the above IPv6 tunnel encapsulation is a non-negligible overhead for the MN communicating over the wireless link. How to reduce the encapsulation overhead and increase the effective utilization of bandwidth is of great significance to wireless links.

A method for transmitting an IP packet that reduces the overhead of a mobile IP tunnel encapsulation in the prior art is: a tunnel optimization method. In this method, when the MN needs to communicate with the CN, in the process of registering in the hometown, according to the address of the CoA of the MN, the address of the CN, and the address of the home agent (HAA, Home Agent

Address) Generate an address translator, and MN will save the address translator.

Then, the MN sends a BU message carrying the address translator to the HA, and after receiving the BU message, the HA saves the address translation in the BU message. After that, the data message that the MN communicates with the CN does not need to be tunnel encapsulated.

When the MN sends an IP packet to the CN, the MN fills in the source address of the IP packet as CoA, and the destination address is filled in as HA A. After receiving the IP packet, the HA queries the saved address translation function according to the CoA and HAA in the IP packet to obtain the corresponding CN address. HA also obtains the corresponding HoA based on the CoA. The HA translates the source address of the IP packet into ΗοΑ, and the destination address is translated into the address of the CN, and the translated message can be normally received and processed by the CN.

When the CN sends an IP packet to the MN, the CN fills the source address of the IP packet with the address of the CN, and the destination address is filled with the HoA. After receiving the IP packet, the HA queries the saved address translator according to the address of the CN in the IP packet to obtain the corresponding CoA.

The HA translates the source address of the IP packet into a HAA, and the destination address is translated into CoA, and the translated message is sent to the MN. After receiving the translated IP packet, the MN queries the saved address translation character according to the CoA and HAA in the IP packet to obtain the corresponding CN address, and the MN replaces the source address of the IP packet with the CN. The address, the destination address is replaced with HoA.

The disadvantages of the foregoing method for transmitting IP packets that reduce the overhead of mobile IP tunnel encapsulation are as follows: [16] 1. When a MN communicates with multiple CNs, the MN needs to support multiple CoA mechanisms;

[17] 2. When the MN receives the message from the HA, it is difficult to distinguish whether the message is the message optimized by the tunnel or the message of the CoA communication with the MN without the tunnel optimization;

[18] 3. When the HA receives the message from the MN, it is difficult to distinguish whether the message is the message that the MN communicates with other nodes after the tunnel optimization, or the direct communication with the HA without the above tunnel optimization. Message.

[19] Summary of the invention

[20] The purpose of the embodiments of the present invention is to provide a method and an apparatus for transmitting a mobile IP packet, so as to solve the above-mentioned prior art, the MN needs to support multiple CoA mechanisms, and the MN and the HA cannot perform the received message. Effectively differentiated issues.

[21] The purpose of the embodiment of the present invention is achieved by the following technical solutions:

[22] A method for transmitting a mobile IP packet, comprising:

[23] The home agent HA of the mobile node MN receives the first IP packet sent by the MN to the communication peer CN; [24] the HA according to the address of the CN carried in the first IP packet The corresponding identifier queries the association relationship between the address of the CN stored locally and the corresponding identifier, and obtains the address of the CN from the association relationship;

[25] The HA replaces the source address of the first IP packet with the care-of address CoA of the MN with the home address of the MN, and the destination address of the first IP packet is The HA address of the HA is replaced with the address of the CN; the HA sends the first IP packet after the address translation to the CN.

[26] A method for transmitting a mobile IP packet, comprising:

[27] The home agent HA of the mobile node MN receives the second IP packet sent by the communication peer CN to the MN; [28] the HA checks the address of the CN carried in the second IP packet. Querying the association relationship and obtaining an identifier corresponding to the address of the CN, and replacing the source address of the second IP packet with the address of the CN by the HA address of the HA, and the second IP packet The destination address of the MN is replaced by the MN's home address H oA as the MN's care-of address CoA, and the identifier corresponding to the CN address is carried in the second IP packet;

[29] The HA sends the second IP packet after the address translation to the MN.

[30] A home agent HA, which is used as a home agent of the mobile node MN. When the MN roams to the foreign network, the HA is used to forward the first IP packet sent by the MN to the CN and the CN to the MN. Second IP packet , wherein the HA comprises:

[31] an association relationship storage module, configured to store an association relationship between an address of the CN and an identifier corresponding to the address of the CN;

[32] a message receiving module, configured to receive the first IP packet and the second IP packet;

[33] an address conversion module, configured to query an association relationship stored by the association relationship storage module according to an identifier corresponding to the address of the CN carried in the first IP packet, and obtain an address of the CN from the Replacing the source address of the first IP packet with the home address HoA of the MN by the care-of address CoA of the MN, and replacing the destination address of the first IP packet with the HAA of the HA An address of the CN; and, according to the address of the CN carried in the second IP packet, querying an association relationship stored by the association relationship storage module, and acquiring an identifier corresponding to the address of the CN, The source address of the second IP packet is replaced by the address of the CN as the HAA of the HA, and the destination address of the second IP packet is replaced by the MN's home address HoA to the MN. Handing over the address CoA, and carrying the identifier in the second IP packet;

[34] The message sending module is configured to send the IP packet that is address-converted by the address translation module to the CN or MN that is the receiving end of the IP packet.

[35] A mobile node MN, configured to communicate with a communication peer CN by a home agent HA, where the HA is used to forward an IP packet that is communicated between the MN and the CN, where the IP packet includes The first IP packet sent by the MN to the CN, where the MN includes:

[36] an association relationship storage module, configured to store an association relationship between an address of the CN and an identifier corresponding to the address of the CN;

[37] a message sending module, configured to query, according to an address of the receiving end CN of the first IP packet, an association relationship stored in the association relationship storage module, and obtain an identifier corresponding to the address of the CN, Adding the identifier to the first IP packet, and sending the first IP packet carrying the identifier to the HA

[38] A system for transmitting a mobile IP packet, the system includes at least one home agent HA, and the home agent HA is configured to receive a first IP packet sent by the corresponding mobile node MN to the communication peer CN. Querying, by the CN, the second IP packet sent by the CN to the MN, and querying, according to the identifier corresponding to the address of the CN, the address of the CN and the corresponding Relationship between identifiers Obtaining the address of the CN from the association relationship, replacing the source address of the first IP packet with the care-of address CoA of the MN, and replacing the home address of the MN with the MN, and the first The destination address of the IP packet is replaced by the address HAA of the HA to the address of the CN; and the association relationship is queried according to the address of the CN carried in the second IP packet and the Corresponding identifier, the source address of the second IP packet is replaced by the address of the CN by the address HAA of the HA, and the destination address of the second IP packet is replaced by the home address HoA of the MN The bearer address CoA of the MN, and the identifier is carried in the second IP packet; the IP packet that is subjected to the address translation is sent to the CN or MN that is the receiving end of the IP packet. .

According to the technical solution provided by the foregoing embodiment of the present invention, the embodiment of the present invention stores the association relationship between the address of the CN and the corresponding identifier in the HA and the MN, and the HA receives the received relationship according to the association relationship. The IP packet communicated between the MN and the CN performs address translation processing, so that when the MN communicates with multiple CNs, the MN does not have to support multiple CoA functions. The HA and the MN can correctly identify the packet according to the identifier corresponding to the address of the CN carried in the received packet.

[40] BRIEF DESCRIPTION OF THE DRAWINGS

[41] FIG. 1 is a schematic diagram of a format of a message transmitted by a CN intercepted by a CN to a home network of a MN and a MN communication;

[2] FIG. 2 is a schematic diagram of a format of a packet encapsulated by a HA in a prior art;

[43] FIG. 3 is a schematic diagram of a format of a packet encapsulated by a MN after tunnel encapsulation in the prior art;

[44] FIG. 4 is a schematic diagram of a packet format of a HA after tunnel encapsulation in the prior art;

[45] FIG. 5 is a schematic diagram of a packet format of an IPv6 tunnel encapsulation in the prior art;

6 is a flowchart of processing a message transmission method in a mobile IP according to Embodiment 1 of the present invention; [47] FIG. 7 is an option of a destination address sent by a MN according to Embodiment 1 of the present invention; A format diagram of a packet carrying the ID 1 corresponding to the address information of the CN1;

8 is a corresponding to the address information of the CN1 carried in the packet header by the HA according to the first embodiment of the present invention.

a format diagram of the message of D;

9 is a flowchart of processing a packet transmission method in a mobile IP according to Embodiment 2 of the present invention; [10] FIG. 10 is a packet in a mobile IP according to Embodiment 3 of the present invention; [Processing flow chart of the transmission method; [51] FIG. 11 is a schematic structural diagram of a HA according to an embodiment of the present invention; FIG. 12 is a schematic structural diagram of a MN according to an embodiment of the present invention.

[53] Mode for carrying out the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the embodiment of the present invention, the MN or the HA allocates an identifier corresponding to the address of the CN, and the association relationship between the address of the CN and the corresponding identifier is saved in both the MN and the HA. The HA receives the IP packet of the communication between the MN and the CN, performs address translation processing on the IP packet according to the association relationship stored locally, and sends the IP packet after the address translation processing to the CN or MN at the receiving end of the IP packet.

[56] In the foregoing process, after the HA receives the first IP packet that is sent by the MN and carries the identifier corresponding to the address of the CN, the source address of the first IP packet is the care-of address CoA of the MN. The destination address is the address HAA of the HA, and the HA queries the association relationship information according to the identifier to obtain the address of the CN corresponding to the identifier, and replaces the destination address of the first IP packet with the CN. The IP address of the first IP packet is replaced with the home address of the MN, and the IP packet that has been replaced is sent to the CN.

[57] In the foregoing process, after the HA receives the second IP packet sent by the CN, the source address of the second IP packet is the address of the CN, and the destination address is ΗοΑ of the MN. The HA queries the association information according to the address of the CN to obtain an identifier corresponding to the address of the CN, and replaces the destination address of the second IP packet with the CoA of the MN, and replaces the source address with the HAA. After the identifier is carried in the second IP packet that has undergone the replacement process, the second IP packet is sent to the MN.

[0] The MN receives the second IP packet sent by the HA, and extracts the identifier in the second IP packet, and the MN queries the association relationship information according to the identifier to obtain the identifier. The address of the corresponding CN is replaced by the source address of the second IP packet with the address of the CN, and the destination address is replaced by the HoA.

[59] Further, the identifier corresponding to the address of the CN may be an integer shorter than the IPv6 address, and may also be referred to as a label. In an actual application, the identifier may be: an identifier of a binding cache entry that stores an address of the CN.

The following is a description of the embodiments of the present invention, and the embodiments of the present invention are not to be construed as limiting.

[61] Embodiment 1

[62] A processing flow of a message transmission method in mobile IP according to Embodiment 1 of the present invention is shown in FIG. Including the following processing steps:

[63] Step 61: The MN sends a BU message carrying the address of CN1 to the HA.

[64] When the MN needs to communicate with CN1 through HA, the MN adds a mobile CN option to the BU message, which includes the address of CN1. Then, the MN sends a BU message carrying the above mobile CN option to the HA.

[65] Step 62: The HA saves the received address of the CN1, and records an identifier ID 1 corresponding to the address of the CN1.

[66] After receiving the BU message from the MN, the HA verifies the BU message, and after the verification succeeds, acquires the address information of the CN1 included in the mobile CN option from the BU message.

[67] The HA searches for the address information of CN1 in the locally saved CN list, and if not, adds the address information of CN1 to the CN list, and records an identifier ID1 corresponding to the address of CN1. The correspondence between the CoA of the MN and the HoA is also stored in the HA.

[68] Step 63: The HA sends the address of the CN1 and the corresponding identifier ID1 to the MN.

[69] When the HA needs to reply to the MN message, the HA adds a mobile CN option to the BA message, and the mobile CN option includes the address information of CN1 and the corresponding ID1. The HA then sends a BA message carrying the mobile CN option to the MN.

[70] After receiving the foregoing BA message, the MN obtains the address information of the CN1 and the corresponding I from the BA message.

Dl, and associate storage. Similarly, the correspondence between the MN's CoA and the HoA is also stored in the MN.

[71] Step 64: The MN sends an IP packet carrying the identifier ID1 corresponding to the address information of the CN1 to the HA, and the HA is the I.

After the source and destination addresses of the P packet are replaced, they are sent to CN1.

[72] The MN sends an IP packet to CN1. The source address of the IP packet is the care-of address CoA of the MN, and the destination address is the HA address of the HA. The MN adds the ID1 corresponding to the address information of the above CN1 in the header of the IP packet.

, ID1 is carried in the option of the destination address in the header of the IP packet.

[73] The message format of the ID1 corresponding to the address information of the CN1 in the option of the destination address sent by the MN is as shown in FIG. 7.

[74] After receiving the IP packet sent by the MN, the HA extracts the ID1 carried in the IP packet, and the source address CoA and the destination address HAA. Then, the HA queries the saved CN list according to the above ID1, obtains the address of the CN1 corresponding to the ID1, and acquires the HoA associated with the association according to the CoA. [75] Then, the HA uses the HoA to replace the source address CoA of the IP packet, and replaces the IP address of the IP packet with the address of the CN1, and sends the IP packet with the address replacement to CN1.

[76] Step 65: The HA receives the IP packet sent by the CN1 to the MN, and replaces the source address and the destination address of the IP packet, and then sends the IP packet to the MN.

[77] CN1 sends an IP packet to the MN. The source address of the IP packet is the address of CN1, and the destination address is Ho A of the MN.

[78] The HA receives the IP packet sent by the CN1 to the MN, and extracts the address of the CN1 and the Ho A in the IP packet. Then, the HA queries the saved CN list according to the address of the above CN1, obtains the identifier ID1 corresponding to the address of the CN1, and acquires the CoA saved by the association according to the HoA. The HA adds the above ID1 to the packet header, replaces the source address in the packet with the HAA, and replaces the destination address with the CoA and sends it to the MN. A schematic diagram of a packet format of the identifier ID1 corresponding to the address information of the CN1 in the packet header is shown in FIG. 8.

[79] After receiving the IP packet sent by the HA, the MN extracts the ID 1, HAA, and CoA in the IP packet.

Then, the MN obtains the address of the CN1 whose association is saved according to the above ID1, and acquires the HoA whose association is saved according to the CoA.

[80] The MN replaces the source address of the IP packet with the address of CN1, and replaces the destination address with HoA.

[81] Example 2

[82] The processing flow of the packet transmission method in the mobile IP provided by the second embodiment of the present invention is as shown in FIG. 9, and includes the following processing steps:

[83] Step 91: The MN assigns the identifier ID1 to the CN1, and sends the CN1 and the corresponding identifier ID1 to the HA.

[84] When the MN intends to communicate with CN1 using the bidirectional tunnel mode via HA, the MN assigns CN1 an identification ID 1, which is used to distinguish between different CNs communicating with the MN.

[85] Then, the MN sends a BU message to the HA, and adds a mobility option to the BU message, the mobile option including the address of CN 1 and the corresponding identification ID 1.

[86] Step 92: The HA saves the received CN1 and the corresponding ID1 information.

[87] After receiving the above BU message from the MN, the HA verifies the BU message. After the verification is passed, the corresponding BCE1 (Binding Cache)

Entry, binding cache entry) saves the address of CN1 and the corresponding ID1 information. [88] HA replies to the BA message to the MN.

[89] Step 93: The MN sends an IP packet carrying the identifier ID1 corresponding to the CN1 to the HA, and the HA replaces the source address and the destination address of the IP packet, and then sends the packet to the CN1.

[90] When the MN needs to send an IP packet to CN1, the source address of the IP packet is the care-of address CoA of the MN, and the destination address is the HA address of the HA. The MN adds the identifier ID 1 corresponding to the CN 1 in the header of the IP packet.

[91] The IP packet sent by the MN is received by the HA, and the HA extracts the ID 1, CoA, and ΗΑΑ in the IP packet, and indexes the corresponding BCEl according to the ID1 to obtain the address of the corresponding CN1 stored in the BCEl. . The HA also queries the HoA whose association is saved based on the CoA.

[92] Then, the HA uses the HoA to replace the source address CoA of the IP packet, and uses the address of the CN1 to replace the destination address HAA of the IP packet, and sends the IP packet with the address replacement to CN1.

[93] Example 3

[00] The processing flow of the packet transmission method in the mobile IP provided by the third embodiment of the present invention is as shown in FIG. 10, and includes the following processing steps:

[95] Step 101: The MN sends a BU message carrying the address of CN1 to the HA.

[96] When the MN needs to communicate with CN1 through HA, the MN adds a mobile CN option to the BU message, which contains the address of CN1. Then, the MN sends a BU message carrying the above mobile CN option to the HA.

[97] Step 102: The HA saves the received address information of CN1 in BCE1.

[98] After receiving the BU message from the MN, the HA verifies the BU message, and after the verification is passed, obtains the address information of the CN1 included in the mobile CN option.

[99] The HA stores the address of CN1 and the corresponding ID1 information of BCE1 in BCE1. Also store in HA

The correspondence between MN's CoA and HoA.

[100] Step 103: The HA sends the address information of CN1 and the identifier ID1 of the corresponding BCE1 to the MN.

[101] When the HA needs to reply to the MN with a B A message, the HA adds a mobile CN option to the BA message, the move

The CN option includes the address information of the above CN1 and the identifier ID1 of the corresponding BCE1. The HA then sends the BA message carrying the mobile CN option to the MN.

[102] After receiving the foregoing BA message, the MN obtains the address information of the CN1 and the corresponding B from the BA message. CE1 identifies ID1 and stores it in association. Similarly, the correspondence between the CoA of the MN and the HoA is also stored in the MN.

[103] Step 104: The MN sends an IP packet carrying the ID1 of the BCE1 to the HA, and the HA replaces the source address and the destination address of the IP packet, and then sends the packet to the CN1.

[104] When the MN needs to send an IP packet to CN1, the source address of the IP packet is the care-of address CoA of the MN, and the destination address is the HA address of the HA. The MN adds the identifier ID1 of the BCE1 to the header of the IP packet, and the identifier ID1 of the BCE1 is carried in the option of the destination address in the header of the IP packet.

[105] The IP packet sent by the MN is received by the HA, and the HA extracts the identifier I D1 of the BCE1 carried in the IP packet, and the source address CoA and the destination address HAA. Then, the HA queries the corresponding BCE1 according to the identifier ID1 of the BCE1, and acquires the address of the CN1 stored in the BCE1. The HA also obtains the HoA whose association is saved based on the CoA.

[106] Then, the HA uses the HoA to replace the source address CoA of the IP packet, and uses the address of CN1 to replace the destination address HAA of the IP packet, and sends the IP packet with the address replacement to CN1.

[107] A schematic structural diagram of an HA according to an embodiment of the present invention is shown in FIG. 11. The HA is a home agent of a mobile node MN, and when the MN roams to a foreign network, the HA is used to forward the MN and The IP packet of the communication between the peer CNs, the IP packet includes a first IP packet sent by the MN to the CN, and a second IP packet sent by the CN to the MN, where the HA includes the following modules:

[108] The association relationship storage module 111 is configured to store an association relationship between the address of the CN and the identifier corresponding to the address of the CN. There are at least two ways for the HA to obtain the address of the CN and the corresponding identifier. One mode is that after the HA receives the address of the CN sent by the MN, the HA assigns a corresponding identifier to the address of the CN. Another way is that the HA extracts the CN address and the corresponding identifier directly from the BU message sent by the MN.

[109] The message receiving module 112 is configured to receive an IP packet for communication between the MN and the CN. Further, when the MN sends the corresponding identifier to the address of the CN, the message receiving module 112 is further configured to receive the address of the CN sent by the MN and the address of the CN. And the identifier corresponding to the address of the CN and the address of the CN may be carried in a BU message sent by the MN to the HA; when the HA allocates the corresponding identifier to the address of the CN, the report The text receiving module 112 is further configured to receive an address of the CN sent by the MN, where the address of the CN may be carried by the MN to the HA The BU message sent.

[110] The address conversion module 113 is configured to query the association relationship stored by the association relationship storage module 111 according to the corresponding identifier carried in the first IP packet, and obtain an address of the CN from the The address of the CN is used as the destination address of the first IP packet, and performs address translation on the first IP packet, where the identifier corresponding to the address of the CN may be carried in the report of the first IP packet. In the header, as shown in the In dex option in FIG. 7, the Index option may include an identifier type (Type) of 1B, an identifier length (Length) of IB, and specific identifier content information (Index); The address of the CN carried in the second IP packet is used to query the association relationship stored by the association relationship storage module 111, and obtain an identifier corresponding to the address of the CN, and perform an address on the second IP packet. Conversion.

[111] The address of the CN is used as the destination address of the first IP packet, and performing address translation on the first IP packet specifically includes: using the source address of the first IP packet by the The care-of address CoA of the MN is replaced with the home address of the MN, and the destination address of the first IP packet is replaced by the address of the HA, H AA, with the address of the CN.

The address conversion of the second IP packet includes: replacing the source address of the second IP packet with the address of the CN by the HA address of the HA, and using the second IP address. The destination address of the message is replaced by the home address HoA of the MN as the care-of address CoA of the MN, and the identifier is carried in the second IP packet. The identifier corresponding to the address of the CN may be carried in the header of the second IP packet, as shown by the Index option in FIG.

The message sending module 114 is configured to send the IP packet that has been address-converted by the address translation module 113 to the CN or MN that is the receiving end of the IP packet. Further, when the HA receives the BU message that is sent by the MN and carries the identifier corresponding to the address of the CN and the address of the CN, the message sending module 114 is further configured to reply the BA to the MN. a message, to confirm that the identifier corresponding to the CN address and the address of the CN has been received; and when the HA is configured to assign a corresponding identifier to the address of the CN, the packet sending module 114 is further configured to: An identifier corresponding to the address of the CN and the address of the CN is sent to the MN, and the identifier corresponding to the address of the CN and the address of the CN may be carried in the BA message sent by the HA to the MN.

[114] The HA may further include:

[115] an identifier allocation module 115, configured to address the address of the CN received by the message receiving module 112 An identifier corresponding to the address of the CN, the identifier being used to uniquely identify the address of the CN.

[116] The HA provided by the foregoing embodiment may also implement the unidirectional forwarding of the IP packet of the communication between the MN and the CN.

Each module in the HA is also used to implement an IP packet for forwarding between the MN and the CN in one direction. In other words, the embodiment of the present invention further provides an HA for forwarding a first IP packet sent by the MN to the CN, and an HA for forwarding the second IP packet sent by the CN to the MN.

[117] A schematic diagram of a structure of a mobile node MN according to an embodiment of the present invention is shown in FIG. 12, the home agent of the MN is an HA, and the MN is used to communicate with the communication CN through the HA. The MN roams to the foreign network, and the HA is used to forward the IP packet of the communication between the MN and the CN, where the IP packet includes the first IP packet sent by the MN to the CN and the CN A second IP packet sent to the MN, where the MN includes the following modules:

[118] The association relationship storage module 121 is configured to store an association relationship between an address of the CN and an identifier corresponding to the address of the CN. There are at least two ways for the MN to obtain the identifier corresponding to the address of the CN and the address of the CN. One way is to allocate the address of the CN to the HA, and allocate the address of the CN to the CN. After the corresponding identifier, the address corresponding to the CN returned by the HA and the identifier corresponding to the address of the CN are received; another way is to directly assign a corresponding identifier to the address of the CN.

The message sending module 122 is configured to query the association relationship stored in the association relationship storage module 121 according to the address of the receiving end CN of the first IP packet, and obtain an identifier corresponding to the address of the CN Adding the identifier to the first IP packet, and sending the first IP packet carrying the identifier to the HA, where the source address of the first IP packet is the MN The CoA, the destination address is the address of the HA, HAAo, where the identifier corresponding to the address of the CN may be carried in the header of the first IP packet, as shown by the Index option in FIG. The options may include 1B's identification type (Type), 1 B's identification length (Length), and specific identification content information (Index).

[120] Further, when the MN allocates a corresponding identifier for the address of the CN, the packet sending module 122 is further configured to send, by the HA, the address of the CN and the address of the CN. And the identifier corresponding to the address of the CN and the address of the CN may be carried in a BU message sent by the MN to the HA; when the HA is assigned an identifier corresponding to the address of the CN, The message sending module 122 is further configured to send the address of the CN to the HA, where the address of the CN may be carried by the MN to the HA The BU message sent.

[121] The MN may further include:

[122] The message receiving module 123 is configured to receive a second IP packet that is forwarded by the HA and that carries an identifier corresponding to the address of the CN, and is configured according to the identifier that is carried in the second IP packet. The association relationship is stored in the association relationship, and the source address of the CN corresponding to the identifier is obtained, and the source address of the second IP packet is replaced with the address of the CN. The destination address of the second IP packet is replaced with the home address HoA of the MN. The identifier may be carried in the header of the second IP packet, as shown by the Index option in FIG.

[123] Further, when the MN allocates a corresponding identifier to the address of the CN, and sends a BU message carrying the identifier of the CN and the identifier corresponding to the address of the CN to the HA, The message receiving module 123 is further configured to receive the BA message that is replied by the HA. The message receiving module 123 is further configured to receive the HA sent by the HA. An identifier corresponding to the address of the CN and the address of the CN, and the identifier corresponding to the address of the CN and the address of the CN may be carried in the BA message replied by the HA.

[124] The MN may further include:

[125] The identifier allocation module 124 is configured to allocate a corresponding identifier to the address of the CN, where the identifier is used to uniquely identify the address of the CN.

[126] The embodiment of the present invention further provides a system for transmitting a mobile IP packet, including at least one home agent HA, where the home agent HA is configured to receive a first mobile node MN to send to the communication peer CN. The IP packet and the second IP packet sent by the CN to the MN; querying the locally stored address of the CN according to the identifier corresponding to the address of the CN carried in the first IP packet The association between the identifiers corresponding to the addresses of the CN, and the address of the CN is obtained from the association relationship, and the source address of the first IP packet is replaced by the care-of address CoA of the MN. The home address of the MN is ΗοΑ, and the destination address of the first IP packet is replaced by the address HAA of the HA to the address of the CN; and, according to the CN carried in the second IP packet Querying the association relationship and obtaining an identifier corresponding to the address of the CN, and replacing the source address of the second IP packet with the address of the CN by the address HAA of the HA, The destination address of the second IP packet is replaced by the home address HoA of the MN as the handover destination of the MN. Address CoA, and carrying the identifier in the second IP packet; The converted IP packet is sent to the CN or MN that is the receiving end of the IP packet.

[127] In summary, with the method, system and device according to the embodiment of the present invention, when the MN communicates with multiple CNs, the MN does not have to support multiple CoA functions, and it is not necessary to configure one CoA for each CN that communicates with it. .

[128] For the HA and the MN, since the packet to which the embodiment of the present invention is applied carries the ID corresponding to the address of the CN, the HA and the MN can easily distinguish whether the received packet is applied to the embodiment of the present invention. Post message

Then, the message is processed accordingly.

[129] Since the ID corresponding to the address of the CN is a relatively short value, the embodiment of the present invention is for HA and M.

N's storage resources are relatively small.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or can be realized by means of software plus necessary general hardware platform, the present invention. The technical solution can be embodied in the form of a software product, which can be stored in a computer readable storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), and includes a plurality of instructions for making a computer device (may be a personal computer, server, or network device, etc.) Perform the methods described in various embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

[1] A method for transmitting a mobile IP packet, comprising:

The home agent HA of the mobile node MN receives the first IP packet sent by the MN to the communication peer CN, and the HA queries the local storage according to the identifier corresponding to the address of the CN carried in the first IP packet. The association between the address of the CN and the corresponding identifier, and the address of the CN is obtained from the association relationship; the HA uses the source address of the first IP packet by the MN The care-of address CoA is replaced with the home address ΗοΑ of the MN, and the destination address of the first IP packet is replaced by the address HAA of the HA to the address of the CN;

The HA sends the first IP packet after the address translation to the CN that is the receiving end of the first IP packet.

[2] The method for transmitting a mobile IP packet according to claim 1, wherein the home agent HA of the mobile node MN receives the first IP packet sent by the MN to the communication peer CN, Also includes:

The HA receives the address of the CN sent by the MN, and the HA allocates an identifier to the address of the CN, where the identifier is used to uniquely identify the address of the CN, and the HA saves the address of the CN and the corresponding identifier. And the association relationship is sent to the MN, and the MN saves the association relationship;

Or,

The HA receives the address of the CN and the corresponding identifier sent by the MN, where the identifier is allocated by the MN to the address of the CN, and is used to uniquely identify the address of the CN, and the HA saves the address of the CN And an association relationship between the corresponding identifier, and the MN also saves the association relationship.

[3] The method for transmitting a mobile IP packet according to claim 2, wherein the identifier corresponding to the address of the CN comprises: an identifier of a binding cache entry that stores an address of the CN.

[4] The method for transmitting a mobile IP packet according to claim 1 or 2 or 3, wherein the method further comprises:

Receiving, by the HA, a second IP packet sent by the CN to the MN; The HA queries the association relationship according to the address of the CN carried in the second IP packet, and obtains the corresponding identifier from the association relationship, and the source of the second IP packet is obtained. The address is replaced by the address of the CN with the address HAA of the HA, and the destination address of the second IP packet is replaced by the home address HoA of the MN with the care-of address CoA of the MN, and the identifier is Carrying in the second IP packet;

The HA sends the second IP packet that is subjected to the address translation to the MN that is the receiving end of the second IP packet.

[5] The method for transmitting a mobile IP packet according to claim 4, wherein the method further comprises:

Receiving, by the MN, the second IP packet that is sent by the HA to perform address translation, extracting the identifier in the second IP packet, and the MN queries the association relationship according to the identifier. The address of the CN corresponding to the identifier is obtained, and the source address of the IP packet is replaced with the address of the CN, and the destination address is replaced by the home address HoA of the MN.

[6] A home agent HA, which is used as a home agent of the mobile node MN. When the MN roams to the foreign network, the HA is used to forward the first IP packet sent by the MN to the CN, which is characterized by The HA includes:

An association relationship storage module, configured to store an association relationship between an address of the CN and an identifier corresponding to the address of the CN;

a packet receiving module, configured to receive the first IP packet;

An address conversion module, configured to query an association relationship stored by the association relationship storage module according to an identifier corresponding to the address of the CN carried in the first IP packet, and obtain the CN from the association relationship The address of the first IP packet is replaced by the MN's care-of address CoA with the MN's home address HoA, and the destination address of the first IP packet is from the HA address. The HAA is replaced with the address of the CN;

The message sending module is configured to send the first IP packet that is address-converted by the address translation module to the CN that is the receiving end of the first IP packet.

[7] The HA according to claim 6, wherein the message receiving module is further configured to receive an address of the CN sent by the MN, where the HA further includes: An identifier allocation module, configured to allocate, to the address of the CN, a corresponding identifier, where the identifier is used to uniquely identify an address of the CN;

The message sending module is further configured to send an identifier corresponding to the address of the CN and the address of the CN to the MN.

[8] The HA according to claim 6, wherein the message receiving module is further configured to receive an identifier corresponding to an address of the CN sent by the MN and an address of the CN.

[9] The HA according to claim 6 or 7 or 8, wherein the HA is further used to forward a second IP packet sent by the CN to the MN,

The packet receiving module is further configured to receive the second IP packet;

The address conversion module is further configured to query an association relationship stored by the association relationship storage module according to the address of the CN carried in the second IP packet, and obtain the foregoing relationship from the association relationship. The identifier corresponding to the address of the CN, the source address of the second IP packet is replaced by the address of the CN by the address HAA of the HA, and the destination address of the second IP packet is used by the home of the MN. The address HoA is replaced with the care-of address CoA of the MN, and the identifier corresponding to the address of the CN is carried in the second IP packet;

The packet sending module is further configured to send the second IP packet that is address-converted by the address translation module to the MN that is the receiving end of the second IP packet.

[10] A mobile node MN, configured to communicate with a communication peer CN through a home agent HA, the H

The A is configured to forward the IP packet of the communication between the MN and the CN, where the IP packet includes the first IP packet sent by the MN to the CN, where the MN includes: a relationship storage module, configured to store an association relationship between an address of the CN and an identifier corresponding to an address of the CN;

a message sending module, configured to query, according to an address of the receiving end CN of the first IP packet, an association relationship stored in the association relationship storage module, and obtain an address corresponding to the CN address from the association relationship The identifier is used to add the identifier corresponding to the address of the CN to the first IP packet, and send the first IP packet that carries the identifier corresponding to the address of the CN to the HA.

[11] The MN according to claim 10, wherein the MN further comprises:

An identifier allocation module, configured to allocate a corresponding identifier to the address of the CN, where the address of the CN corresponds The identifier is used to uniquely identify the address of the CN;

The message sending module is further configured to send, to the HA, an address corresponding to the address of the CN and an address of the CN.

[12] The MN according to claim 10, wherein the IP packet further includes a second IP packet that is sent by the CN to the MN, and the MN further includes:

a packet receiving module, configured to receive a second IP packet that is forwarded by the HA and that carries an identifier corresponding to the address of the CN, and check the identifier corresponding to the address of the CN carried in the second IP packet Querying the association relationship stored in the association relationship storage module, and obtaining an address of the CN corresponding to the identifier from the association relationship, and replacing the source address of the second IP packet with the address of the CN And replacing the destination address of the second IP packet with the home address HoA of the MN.

[13] The MN according to claim 12, wherein the message receiving module is further configured to receive an identifier corresponding to an address of the CN sent by the HA and an address of the CN.

[14] The MN according to claim 10, wherein the message sending module is further configured to send the address of the CN to the HA.

[15] A system for transmitting mobile IP messages, characterized in that the system comprises a home agent HA

The home agent HA is configured to receive the first IP packet sent by the mobile node MN to the CN of the communication peer; and query the local storage according to the identifier corresponding to the address of the CN carried in the first IP packet The association between the address of the CN and the identifier corresponding to the address of the CN, and the address of the CN is obtained from the association relationship, and the source address of the first IP packet is used by the MN The care-of address CoA is replaced with the home address ΗοΑ of the MN, and the destination address of the first IP packet is replaced by the address HAA of the HA to the address of the CN, and the first address after the address conversion is performed. The IP packet is sent to the CN that is the receiving end of the first IP packet.

[16] The system for transmitting a mobile IP packet according to claim 15, wherein the HA is further configured to receive a second IP packet sent by the CN to the MN; The address of the CN carried in the second IP packet is used to query the association relationship, and the corresponding identifier is obtained from the association relationship, and the source address of the second IP packet is from the address of the CN. The address of the second IP packet is replaced by the home address HoA of the MN to the care-of address CoA of the MN, and the identifier corresponding to the address of the CN is carried in the address HAA of the HA. The first In the second IP packet, the second IP packet that is subjected to the address translation is sent to the MN that is the receiving end of the second IP packet.