IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0323712
(2005-12-30)
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등록번호 |
US-7509123
(2009-03-24)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
30 |
초록
▼
Extending Mobile IP to support both local and remote access by using two MIP client stacks in the end node, a roaming Node in the local access network, a standard Home Agent in the remote network. Messages between the AR and the MN, and between the internal modules of the MN, are then used to contr
Extending Mobile IP to support both local and remote access by using two MIP client stacks in the end node, a roaming Node in the local access network, a standard Home Agent in the remote network. Messages between the AR and the MN, and between the internal modules of the MN, are then used to control hand-off for each MIP client and to enable backwards compatibility with legacy remote access clients.
대표청구항
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What is claimed is: 1. A method of operating a mobile node including a local mobility agent module and a remote mobility agent module to interoperate with a communications network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being ass
What is claimed is: 1. A method of operating a mobile node including a local mobility agent module and a remote mobility agent module to interoperate with a communications network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being associated with at least one of said roaming nodes in said communications network, different ones of said access nodes from those included in said set being associated with different roaming nodes, the method comprising: operating said local mobility agent module to handle a handoff between two of said access nodes, said two of said access nodes including a first access node and a second access node; and operating said remote mobility agent module to handle handoff between two of said roaming nodes, said two of said roaming nodes including a first roaming node and a second roaming node. 2. The method of claim 1, further comprising: operating said local mobility agent module to communicate information from said local mobility agent module indicating assignment of a new roaming address to said remote mobility agent module, said information indicating assignment of a new roaming address to said mobile node. 3. The method of claim 2, wherein said new roaming address is assigned in response to a roaming node handoff, the method further comprising: operating said remote mobility agent module to send registration information to a remote home agent to bind a home address associated with said end node to said new roaming address. 4. The method of claim 3, wherein said mobile node further comprises an interface between said local mobility agent module and said remote mobility agent module; and wherein said step of communicating information includes resetting said interface. 5. The method of claim 3, wherein said step of communicating information includes transmitting said new roaming address from said local mobility agent module to said remote mobility agent module. 6. The method of claim 2, further comprising: receiving from one of said two access nodes, handoff information used to control handoff procedures at said mobile node, said handoff information including the address of a roaming node associated with one of said two access node. 7. The method of claim 6, wherein said step of communicating information includes transmitting a modified version of said handoff information received from one of said two access nodes from said local mobility agent module to said remote mobility agent module. 8. The method of claim 2, wherein said step of operating said local mobility agent module to handle a handoff includes: operating said local mobility agent module to receive mobile node handoff information from at least one of said first and second access nodes, said mobile node handoff information including the address of at least one roaming node assigned to said second access node. 9. The method of claim 6, further comprising: comparing at least some of said received handoff information to previously received information to determine whether there has been a change in which roaming node is associated with an access node used to couple said mobile device to said communications network. 10. The method of claim 9, wherein said communications network further includes a DHCP server coupled to said access nodes, said mobile node further including a DHCP client module, the method further comprising: operating the DHCP client module to configure said interface. 11. The method of claim 10, wherein operating the DHCP server client module to configure said interface includes: transmitting a DHCP message to said DHCP server; receiving the new roaming address in a DCHP message from said DCHP server; and using the new roaming address as an interface address for a second mobile IP client included in said mobile node. 12. The method of claim 11, further comprising, prior to operating said DHCP client module to configure said interface, loading the DHCP server module with the new roaming address. 13. The method of claim 3, wherein the local and remote mobility agent modules each include: at least one mobile IP client. 14. The method of claim 1, wherein said access nodes are access routers. 15. The method of claim 14, wherein said roaming nodes are network nodes coupled to said access routers. 16. The method of claim 14, wherein said communications network includes more access routers than roaming nodes. 17. The method of claim 6, wherein said handoff information is transmitted in a mobile IP foreign agent advertisement message. 18. The method of claim 1 wherein said plurality of access nodes and said plurality of roaming access are located in the same network, said same network being a visited network. 19. The method of claim 18, wherein said access nodes and said roaming nodes are arranged in a hierarchal relationship with roaming nodes being located in said hierarchy above access nodes; and wherein operating said local mobility agent module to handle a handoff between two of said access nodes, said two of said access nodes including a first access node and a second access node includes operating the local mobility agent module to implement a handoff between two access nodes located in said hierarchy under the said first roaming node. 20. The method of claim 18, wherein said first and second roaming nodes are located at the same level in said hierarchy. 21. A method of operating a mobile node including a local mobility agent module and a remote mobility agent module to interoperate with a communications network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being associated with at least one of said roaming nodes in said communications network, different ones of said access nodes from those included in said set being associated with different roaming nodes, the method comprising: operating said local mobility agent module to handle a handoff between two of said access nodes, said two of said access nodes including a first access node and a second access node; operating said remote mobility agent module to handle handoff between two of said roaming nodes, said two of said roaming nodes including a first roaming node and a second roaming node; operating said local mobility agent module to communicate information from said local mobility agent module indicating assignment of a new roaming address to said remote mobility agent module, said information indicating assignment of a new roaming address to said mobile node; wherein said step of operating said local mobility agent module to handle a handoff includes: operating said local mobility agent module to receive mobile node handoff information from at least one of said first and second access nodes, said mobile node handoff information including the address of at least one roaming node assigned to said second access node; comparing at least some of said received handoff information to previously received information to determine whether there has been a change in which roaming node is associated with an access node used to couple said mobile device to said communications network; and operating the local mobility agent module in said mobile node to send a registration message to the roaming node, associated with said access node, to request a new roaming node address, said registration message being sent in response to determining that there has been a change in which roaming node is associated with an access node used to couple said mobile device to said communications network. 22. A communications system comprising: a communications network including a plurality of access nodes and a plurality of roaming nodes, a set of access nodes including multiple access nodes being associated with at least one of said roaming nodes in said communications network, different ones of said access nodes from those included in said set being associated with different roaming nodes; a mobile node coupled to one of said access nodes, the mobile node including: a local mobility agent module including means for handling a handoff between two of said access nodes; and a remote mobility agent module including means for handling a handoff between two of said roaming nodes. 23. The communication system of claim 22, wherein the local and remote mobility agent modules each include, internal to said mobile node: at least one mobile IP client. 24. The communication system of claim 22, wherein said plurality of access nodes and said plurality of roaming access are located in the same network, said network being a visited network; wherein said visited network is coupled to a home network in which a home agent corresponding to said mobile node is located, said home network and said visited network being compatible networks both of which use Mobile IP signaling to support mobile node mobility within the home and visited networks, respectively. 25. The communication system of claim 22 wherein said plurality of access nodes and said plurality of roaming access are located in the same network. 26. The communication system of claim 25, wherein said access nodes and said roaming nodes are arranged in a hierarchal relationship with roaming nodes being located in said hierarchy above access nodes; and wherein said local mobility agent module supports handoffs between two of said access nodes located in said hierarchy under the same roaming node. 27. The communication system of claim 26, wherein said first and second roaming nodes are located at the same level in said hierarchy; and wherein said remote mobility agent module supports handoffs between two of said roaming nodes located at the same level in said hierarchy. 28. The communications system of claim 25, wherein said same network is visited network, said communications system further including a home network which includes a Home Agent corresponding to said mobile node, the visited network and home network using compatible data routing mechanisms. 29. A computer readable medium including computer executable instructions for controlling a mobile node including a local mobility agent module and a remote mobility agent module to implement a method of interoperating with a network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being associated with at least one of said roaming nodes in said network, different access nodes from those included in said set being associated with another roaming node, the method comprising: operating said local mobility agent module to handle a handoff between two of said access nodes, said two of said access nodes including a first access node and a second access node; operating said remote mobility agent module to handle handoff between two of said roaming nodes, said two of said roaming nodes including a first roaming node and a second roaming node; and wherein said network is a visited network and wherein said visited network is coupled to a home network of said mobile node in which a home agent corresponding to said mobile node is located. 30. A mobile node including a processor configured to control the mobile node including a local mobility agent module and a remote mobility agent module to implement a communications method of interoperating with a network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being associated with at least one of said roaming nodes in said network, different access nodes from those included in said set being associated with another roaming node, the method comprising: operating said local mobility agent module to handle a handoff between two of said access nodes, said two of said access nodes including a first access node and a second access node; operating said remote mobility agent module to handle handoff between two of said roaming nodes, said two of said roaming nodes including a first roaming node and a second roaming node; and wherein said network is a visited network and wherein said visited network is coupled to a home network of said mobile node in which a home agent corresponding to said mobile node is located. 31. A mobile node for use in a communications network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being associated with at least one of said roaming nodes in said communications network, different ones of said access nodes being associated with different roaming nodes, the mobile node comprising: a memory storing a first address that is associated with a home agent of said mobile node and a second address associated with a roaming node, said home agent being located in a home network, said roaming node being located in a visited network; a local mobility agent module for handling a handoff between two access nodes located in said visited network; and a remote mobility agent module for handling handoff between two of said roaming nodes in said visited network. 32. The mobile node of claim 31, wherein said memory further stores a third address to originate a packet towards said home agent and a fourth address used to originate a packet towards said roaming node. 33. A mobile node for use in a communications network including a plurality of access nodes and a plurality of roaming nodes, a set including multiple access nodes being associated with at least one of said roaming nodes in said communications network, different ones of said access nodes being associated with different roaming nodes, the mobile node comprising: storage means for storing a first address that is associated with a home agent of said mobile node and a second address associated with a roaming node, said home agent being located in a home network, said roaming node being located in a visited network; local mobility agent means for handling a handoff between two access nodes located in said visited network; and remote mobility agent means for handling handoff between two of said roaming nodes in said visited network. 34. The mobile node of claim 33, wherein said storage means further stores a third address to originate a packet towards said home agent and a fourth address used to originate a packet towards said roaming node.
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