Methods and apparatus for tunneling between different addressing domains
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04Q-007/24
H04L-012/28
출원번호
US-0413888
(2003-04-14)
등록번호
US-7366147
(2008-04-29)
발명자
/ 주소
O'Neill,Alan
출원인 / 주소
QUALCOMM Incorporated
대리인 / 주소
Straub & Pokotylo
인용정보
피인용 횟수 :
13인용 특허 :
28
초록▼
Methods and apparatus for enhancing Mobile IP (MIP) signaling and to support the use of a novel proxy Co-located Care-of Address (PCCoA) are described. The enhanced MIP signaling adds the ability for the Mobile Node (MN) to acquire a MN specific Foreign Agent (FA) CoA that provides the MN with a top
Methods and apparatus for enhancing Mobile IP (MIP) signaling and to support the use of a novel proxy Co-located Care-of Address (PCCoA) are described. The enhanced MIP signaling adds the ability for the Mobile Node (MN) to acquire a MN specific Foreign Agent (FA) CoA that provides the MN with a topologically correct local address yet whose tunnel encapsulation/decapsulation is provided by the FA. This address is called a proxy CCoA (PCCoA) and the associated processing in the MN and FA is called Proxy CCoA tunneling. This capability is applicable to any access technology but is especially useful for wireless systems where the access bandwidth is expensive and when point-to-point link-layer connectivity exists between the MN and the FA. A method is supported for reverse tunneling and smooth hand-off extensions based on the PCCoA that enables inter-FA forwarding even for CCoAs.
대표청구항▼
What is claimed is: 1. A communications method comprising; operating a first node to transmit a packet towards a second node using a first address of the first node as a source address and a second address, associated with the second node, as a destination address, operating a third node to interce
What is claimed is: 1. A communications method comprising; operating a first node to transmit a packet towards a second node using a first address of the first node as a source address and a second address, associated with the second node, as a destination address, operating a third node to intercept said packet and encapsulate it into a tunnel using a third address which serves as a source address for said tunnel, said third address having a first prefix, said first prefix being associated with the third node, said third address being assigned to said first node, and using a fourth address corresponding to a fourth node serving as a destination address of said tunnel, said first address corresponding to said first node including a second prefix corresponding to said fourth node, and transmitting said first encapsulated packet to said fourth node. 2. The communications method of claim 1 wherein said first node is a first mobile node, wherein said second node is a second mobile node, wherein said first address is a home address of said first mobile node and said third address is a co-located care of address. 3. The communications method of claim 1, wherein said first and second prefixes are different, each of said prefixes corresponding to a different addressing domain. 4. The communications method of claim 1, further comprising: operating the third node to receive a second encapsulated packet with a destination address equal to said third address and a source address equal to said fourth address, said second encapsulated packet including an inner packet having said second address as a source address and said first address as a destination address, operating the third node to decapsulate said inner packet and forward the inner packet to the first node. 5. The method of claim 4, further comprising: communicating at least one mobile IP signal to said third node to cause said third node to perform said decapsulating and forwarding steps. 6. The method claim 4, wherein the third node is a MIP Local Mobility Agent. 7. The method claim 6, wherein the MIP Local Mobility Agent is one of a MIP Foreign Agent and a MIP Mobility Attendant. 8. The method of claim 4, wherein the fourth node is one of a MIP Home Agent and a MIP Regional Mobility Agent. 9. The method of claim 5 wherein the first node is a MIP Mobile Node, and the second node is a MIP Correspondent Node. 10. The method of claim 4 wherein the forwarding of the inner packet to the first node additionally involves the step of comparing the third address in said encapsulated packet to a table of visitor list entries in the third node, said table including a visitor list entry for the first node including at least one mapping between said third address and a MAC layer destination address of said first node, and wherein said step of forwarding the inner packet includes constructing at least one MAC layer frame including said MAC layer destination address corresponding to said first node and at least a portion of said inner packet. 11. The method of claim 1, wherein the second address is a multicast group address representing a plurality of second nodes who are members of said multicast group, and a point to point mac-layer link exists between the first and third nodes. 12. The method of claim 4 wherein the first address is a multicast group address representing a plurality of first nodes who are members of said multicast group, and a point to point mac-layer link exists between the third and the first node. 13. The method of claim 5 wherein the first node sends said at least one MIP signal to the third node indicating that said decapsulation and forwarding steps are to be performed. 14. A communications method, comprising: operating a first node to transmit a packet towards a second node using a first address of the first node as a source address and a second address, associated with the second node, as a destination address, operating a third node to: i) intercept said packet and encapsulate it into a tunnel using a third address which serves as a source address for said tunnel, said third address having a first prefix, said first prefix being associated with the third node, said third address being assigned to said first node, and using a fourth address corresponding to a fourth node serving as a destination address of said tunnel, said first address corresponding to said first node including a second prefix corresponding to said fourth node; ii) transmit said first encapsulated packet to said fourth node; iii) receive a second encapsulated packet with a destination address equal to said third address and a source address equal to said fourth address, said second encapsulated packet including an inner packet having said second address as a source address and said first address as a destination address; iv) decapsulate said inner packet and forward the inner packet to the first node; and v) receive, prior to receiving said second encapsulated packet, at least one mobile IP (MIP) signal used to cause said third node to perform said decapsulating and forwarding steps; and wherein the at least one MIP signal is a MIP hand-off signal sent towards the third node, said signal indicating that the third node should temporarily undertake said decapsulating and forwarding steps and that said forwarding of the inner packets should involve forwarding said inner packet towards a fifth address at a fifth node, said fifth address being assigned to the first node. 15. The method of claim 14, wherein said fifth node is an access node. 16. The method of claim 15, wherein the forwarding of the inner packet towards the fifth node involves the step of comparing the third address in said encapsulated packet to a table of visitor list entries in the third node, said table including a visitor list entry for the first node including at least one mapping between said third address of the first node and said fifth address of the first node and wherein said step of forwarding the inner packet includes encapsulating the inner packet in a tunnel with a source address equal to the third node address and the destination address corresponding to said fifth address from the fifth node. 17. The method of claim 4 further comprising: operating the third node to receive encapsulated packets including the third address as a source or destination address and to forward said packet to the destination address included in said packet. 18. A third node for use in a communications system including a first node and a second node, the first node transmitting a packet towards the second node using a first address, of the first node as a source address and a second address, associated with the second node, as a destination address the third node comprising: means for intercepting said packet and encapsulating said packet into a tunnel using a third address which serves as a source address for said tunnel, said third address having a first prefix, said first prefix being associated with the third node, said third address being assigned to said first node, and using a fourth address corresponding to a fourth node serving as a destination address of said tunnel, said first address corresponding to said first node including a second prefix corresponding to said fourth node, and means for transmitting said first encapsulated packet to said fourth node. 19. The third node of claim 18 wherein said first node is a first mobile node, wherein said second node is a second mobile node, wherein said first address is a home address of said first mobile node and said third address is a co-located care of address. 20. The third node of claim 19, wherein said first and second prefixes are different, each of said prefixes corresponding to a different addressing domain. 21. A computer readable medium including computer executable instructions for controlling a third node in a communications system to implement a communications method, the communications system including a first node and a second node, the first node transmitting a packet towards the second node using a first address of the first node as a source address and a second address, associated with the second node, as a destination address the communications method comprising: intercepting said packet and encapsulating said packet into a tunnel using a third address which serves as a source address for said tunnel, said third address having a first prefix, said first prefix being associated with the third node, said third address being assigned to said first node, and using a fourth address corresponding to a fourth node serving as a destination address of said tunnel, said first address corresponding to said first node including a second prefix corresponding to said fourth node, and transmitting said first encapsulated packet to said fourth node. 22. A third node in a communications system, the communications system including a first node and a second node, the first node transmitting a packet towards the second node using a first address of the first node as a source address and a second address, associated with the second node, as a destination address, the third node comprising a processor configured to control the third node to perform the steps of: intercepting said packet and encapsulating said packet into a tunnel using a third address which serves as a source address for said tunnel, said third address having a first prefix, said first prefix being associated with the third node, said third address being assigned to said first node, and using a fourth address corresponding to a fourth node serving as a destination address of said tunnel, said first address corresponding to said first node including a second prefix corresponding to said fourth node, and transmitting said first encapsulated packet to said fourth node.
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이 특허에 인용된 특허 (28)
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