IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0705093
(2007-02-12)
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등록번호 |
US-7830788
(2010-11-25)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
4 |
초록
▼
If a trouble, which occurred in a node managing positional information, has been solved, the positional information can be restored only by transmitting a position registration request addressed to one multicast address without need to transmit multiple position registration requests addressed to mu
If a trouble, which occurred in a node managing positional information, has been solved, the positional information can be restored only by transmitting a position registration request addressed to one multicast address without need to transmit multiple position registration requests addressed to multiple mobile terminals (MN). There are included a home agent, a mobile anchor point and a communication node, each of which is a node connected to a network. Each node receives a position registration from a mobile terminal, copies a binding cache to produce a backup binding cache, and maintains and manages the backup binding cache. When recovering from a trouble, each of the home agent, mobile anchor point and communication node searches for the backup binding cache to acquire the binding cache held before occurrence of the trouble; then designates an already registered multicast address for a mobile terminal stored in the acquired binding cache; sends a packet of position registration request to the mobile terminal; regards the acquired binding cache as being valid when a response to the position registration request packet is received from the mobile terminal; and then continues to maintain and manage the acquired binding cache.
대표청구항
▼
The invention claimed is: 1. A mobile communication network system, comprising: a home agent and a mobile anchor point which are nodes each connected to a network, wherein each of the nodes receives a position registration from a mobile terminal, creates a backup binding cache by copying the bindin
The invention claimed is: 1. A mobile communication network system, comprising: a home agent and a mobile anchor point which are nodes each connected to a network, wherein each of the nodes receives a position registration from a mobile terminal, creates a backup binding cache by copying the binding cache, and maintains and manages the backup binding cache; and the home agent searches the backup binding cache in the event of fault recovery and acquires a binding cache that has been held prior to the fault, designates a pre-registered multicast address for the mobile terminal stored in the acquired binding cache and sends a position registration request packet to the pre-registered multicast address of the mobile terminal, renders the acquired binding cache valid when there is a response from the mobile terminal with respect to the position registration request packet sent to the pre-registered multicast address and continues to maintain and manage the acquired binding cache, and when there is no response from the mobile terminal to the position registration request packet sent to the multicast address, the home agent sends the position registration request packet to a unicast address of the mobile terminal, and, when there is no response from the mobile terminal to the position registration request sent to the unicast address, renders the acquired binding cache invalid and deletes the acquired binding cache. 2. The mobile communication network system according to claim 1, wherein the registration of position information is transmitted from the mobile terminal to the multicast address by way of response to the registration of the position information from the home agent. 3. The mobile communication network system according to claim 1, wherein the home agent uses Mobile Internet Protocol. 4. The mobile communication network system according to claim 1, wherein the home agent uses Hierarchical Mobile Internet Protocol. 5. A mobile communication network system, comprising: a home agent and a mobile anchor point which are nodes each connected to a network, wherein each of the nodes receives a position registration from a mobile terminal, creates a backup binding cache by copying the binding cache, and maintains and manages the backup binding cache; and the mobile anchor point searches the backup binding cache in the event of fault recovery and acquires a binding cache that has been held prior to the fault, designates a pre-registered multicast address for the mobile terminal stored in the acquired binding cache and sends a position registration request packet to the pre-registered multicast address of the mobile terminal, renders the acquired binding cache valid when there is a response from the mobile terminal with respect to the position registration request packet sent to the pre-registered multicast address and continues to maintain and manage the acquired binding cache, and when there is no response from the mobile terminal to the position registration request packet sent to the multicast address, the home agent sends the position registration request packet to a unicast address of the mobile terminal, and, when there is no response from the mobile terminal to the position registration request sent to the unicast address, renders the acquired binding cache invalid and deletes the acquired binding cache. 6. The mobile communication network system according to claim 5, wherein the registration of position information is transmitted from the mobile terminal to the multicast address by way of response to the registration of the position information from the mobile anchor point. 7. The mobile communication network system according to claim 6, wherein the mobile anchor point uses Mobile Internet Protocol. 8. The mobile communication network system according to claim 6, wherein the mobile anchor point uses Hierarchical Mobile Internet Protocol. 9. A mobile communication network system, comprising: a home agent, a mobile anchor point, and a correspondent node which are nodes each connected to a network, wherein each of the nodes receives a position registration from a mobile terminal, creates a backup binding cache by copying the binding cache, and maintains and manages the backup binding cache; and the correspondent node searches the backup binding cache in the event of fault recovery and acquires a binding cache that has been held prior to the fault, designates a pre-registered multicast address for the mobile terminal stored in the acquired binding cache and sends a position registration request packet to the pre-registered multicast address of the mobile terminal, renders the acquired binding cache valid when there is a response from the mobile terminal with respect to the position registration request packet sent to the pre-registered multicast address and continues to maintain and manage the acquired binding cache, and when there is no response from the mobile terminal to the position registration request packet sent to the multicast address, the home agent sends the position registration request packet to a unicast address of the mobile terminal, and, when there is no response from the mobile terminal to the position registration request sent to the unicast address, renders the acquired binding cache invalid and deletes the acquired binding cache. 10. The mobile communication network system according to claim 9, wherein the registration of position information is transmitted from the mobile terminal to the multicast address by way of response to the registration of the position information from the correspondent node. 11. The mobile communication network system according to claim 9, wherein the correspondent node uses Mobile Internet Protocol. 12. The mobile communication network system according to claim 9, wherein the correspondent node uses Hierarchical Mobile Internet Protocol. 13. The mobile communication network system according to claim 1, wherein the mobile terminal uses Mobile Internet Protocol and, by means of a multicast address contained in a position information registration response, performs registration of a multicast group identifier (GRP-ID) by using a Multicast Listener Report of Internet Management Protocol (IGMP: Internet Group Management Protocol) in a neighboring router. 14. The mobile communication network system according to claim 5, wherein the mobile terminal uses Mobile Internet Protocol and, by means of a multicast address contained in a position information registration response, performs registration of a multicast group identifier (GRP-ID) by using a Multicast Listener Report of Internet Management Protocol (IGMP: Internet Group Management Protocol) in a neighboring router. 15. The mobile communication network system according to claim 9, wherein the mobile terminal uses Mobile Internet Protocol and, by means of a multicast address contained in a position information registration response, performs registration of a multicast group identifier (GRP-ID) by using a Multicast Listener Report of Internet Management Protocol (IGMP: Internet Group Management Protocol) in a neighboring router. 16. The mobile communication network system according to claim 1, wherein a router by which the position registration request packet is sent to the pre-registered multicast address of the mobile terminal does not support multicast addresses.
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