Communication system using network base ip mobility protocol, control apparatus, router and communication method thereof

Abstract

There are provided a communication system, a control apparatus, a router, and communication method thereof, there are capable of eliminating loss in packets during a handover and effectively releasing a resource of a router in a network base IP mobility protocol in which a mobile mode is movable without mounting a special protocol. When an MN 1 as a mobile terminal is moved, a router at a movement destination, a mobile access gateway (MAG)b 3 that has received a router solicitation from the MN 1 sends a location registration to a control apparatus, a local mobility anchor (LMA) 4 , and when the LMA 4 determines as a handover, the LMA 4 instructs a router at a movement source, an MAGa 2 or an MAGb 3 to transfer a buffer from the MAGa 2 to the MAGb 3.

1 . A communication system using a network base IP mobility protocol, in which a mobile terminal sends and receives data from a router belonging in a same link with a uniquely applied address to perform communication, and when the mobile terminal moves to another network, communication is switched by control of a control apparatus, wherein
 the router in a network at a movement destination of the mobile terminal receives a notification including an identifier of the mobile terminal from the mobile terminal and sends a notification including the identifier of the mobile terminal and an identifier of the router to the control apparatus, and   the control apparatus sends a transfer instruction notification to the router at a movement source or the movement destination of the mobile terminal so that data is transferred from the router at the movement source to the router at the movement destination.   
     
     
         2 . The communication system using the network base IP mobility protocol according to  claim 1 , wherein the router at the movement destination sends the identifier of the mobile terminal to an information management apparatus that performs an authentication and receives information including address setting information of the mobile terminal and the control apparatus from the information management apparatus. 
     
     
         3 . The communication system using the network base IP mobility protocol according to  claim 1 , wherein, when the mobile terminal is moved, data is sent from the control apparatus through the router at the movement source and the router at the movement destination to the mobile terminal, and after communication of the control apparatus and the router at the movement destination and communication of the router at the movement destination and the mobile terminal are established, data is sent from the control apparatus only through the router at the movement destination to the mobile terminal. 
     
     
         4 . The communication system using the network base IP mobility protocol according to any one of  claims 1  to  3 , wherein, when the router at the movement source has received data addressed to the mobile terminal from another router by transfer, the control apparatus sends a transfer cancel instruction notification for instructing cancel of setting for the transfer. 
     
     
         5 . The communication system using the network base IP mobility protocol according to any one of  claims 1  to  3 , wherein, when it is detected that there is no data in a buffer for transferring with respect to the mobile terminal, the router at the movement source sends a transfer cancel instruction notification for canceling transfer setting to the router at the movement destination. 
     
     
         6 . The communication system using the network base IP mobility protocol according to any one of  claims 1  to  3 , wherein, when a communication termination notification is received from the mobile terminal or when an abnormal communication termination of the mobile terminal is detected, the router at the movement destination sends a transfer cancel instruction notification for canceling transfer setting to the router at the movement source. 
     
     
         7 . A control apparatus in a system where, using a network base IP mobility protocol, a mobile terminal sends and receives data from a router belonging in a same link with a uniquely applied address to perform communication, that performs control to switch communication when the mobile terminal moves to another network, comprising:
 a communication means for receiving a notification including an identifier of the mobile terminal and an identifier of the router from the router in a network at a movement destination of the mobile terminal;   a storage means for holding communication information of the router that performs relaying and the mobile terminal; and   a control means for referring to the storage means with respect to communication information of the mobile terminal from the identifier of the mobile terminal included in the notification from the router and updating information of the router at the movement destination to generate a transfer instruction notification for instructing transfer of data from the router at the movement source to the router at the movement destination, wherein   the communication means sends the transfer instruction notification to the router at the movement source or the movement destination of the mobile terminal.   
     
     
         8 . The control apparatus according to  claim 7 , wherein the control means extracts an identifier of the router at the movement source of the mobile terminal from the identifier of the mobile terminal included in the notification from the router at the movement destination by the storage means, and the transfer instruction notification to the router at the movement source or the movement destination includes the identifier of the router at the movement destination or the identifier of the router at the movement source, and the identifier of the mobile terminal. 
     
     
         9 . The control apparatus according to  claim 8 , wherein the control means generates a deletion instruction notification for instructing to the router at the movement source to delete communication information of the router and the control apparatus concerning the mobile terminal and sends it to the router at the movement source through the communication means. 
     
     
         10 . The control apparatus according to  claim 9 , wherein the control means synthesizes the deletion instruction notification and the transfer instruction notification and sends to the router at the movement source through the communication means. 
     
     
         11 . The control apparatus according to any one of claims  7  to  10 , wherein, after communication of the control apparatus and the router at the movement destination and communication of the router at the movement destination and the mobile terminal are established, the control means sends data to the router at the movement destination. 
     
     
         12 . The control apparatus according to any one of  claims 7  to  10 , wherein, when the router at the movement source has received data addressed to the mobile terminal from another router by transfer, the control means generates a transfer setting cancel notification including the identifier of the mobile terminal and the identifier of the another router to delete setting for the transfer, and the communication means sends the transfer instruction notification to the router at the movement source and further sends the transfer setting cancel notification to the router at the movement source. 
     
     
         13 . The control apparatus according to  claim 11 , wherein, when the router at the movement source has received data addressed to the mobile terminal from another router by transfer, the control means generates a transfer setting cancel notification including the identifier of the mobile terminal and the identifier of the another router to delete setting for the transfer, and the communication means sends the transfer instruction notification to the router at the movement source and further sends the transfer setting cancel notification to the router at the movement source. 
     
     
         14 . The control apparatus according to  claim 12 , wherein the control means synthesizes the transfer instruction notification and the transfer setting cancel notification and sends to the router at the movement source. 
     
     
         15 . The control apparatus according to  claim 13 , wherein the control means synthesizes the transfer instruction notification and the transfer setting cancel notification and sends to the router at the movement source. 
     
     
         16 . The control apparatus according to  claim 12 , wherein the control means synthesizes a notification for instructing cancel of communication with the control apparatus and the transfer setting cancel notification and sends to the router at the movement source. 
     
     
         17 . The control apparatus according to  claim 13 , wherein the control means synthesizes a notification for instructing cancel of communication with the control apparatus and the transfer setting cancel notification and sends to the router at the movement source. 
     
     
         18 . A router that uses a network base IP mobility protocol to perform transmission and reception of data to and from a mobile terminal belonging in a same link that performs communication with a uniquely applied address by control of a control apparatus, comprising:
 a communication means for receiving a notification from a mobile terminal that has moved; and   a control means for generating a notification including an identifier of the mobile terminal and an identifier of the router to be sent to the control apparatus, wherein   the communication means sends the notification to the control apparatus, and   the control means transfers data received from the router at a movement source to the mobile terminal by a transfer instruction notification from the control apparatus or a notification from the router at the movement source.   
     
     
         19 . The router according to  claim 18 , wherein, when a transfer instruction notification of the mobile terminal that has moved to another network is received from the control apparatus, the control means transfers data addressed to the mobile terminal to the router at the movement destination. 
     
     
         20 . The router according to  claim 19 , wherein the control means transfers data addressed to the mobile terminal with an address of the router at the movement destination added as a header. 
     
     
         21 . The router according to  claim 20 , wherein the communication means sends the received identifier of the mobile terminal to an information management apparatus that performs an authentication and receives information including address setting information of the mobile terminal and the control apparatus from the information management apparatus. 
     
     
         22 . The router according to  claim 21 , further comprising a storage means for holding communication information of the mobile terminal,
 wherein, when a deletion instruction notification is received from the control apparatus, the control means deletes communication information of the router and the control apparatus concerning the mobile terminal from the storage means.   
     
     
         23 . The router according to any one of  claims 18  to  22 , wherein by a notification from the control apparatus that has received, by transfer, data addressed to the mobile terminal from another router to instruct cancel of transfer setting, the control means sends a transfer setting cancel notification including the identifier of the mobile terminal and the identifier of the router to the another router. 
     
     
         24 . The router according to  claim 23 , wherein the communication means receives the transfer instruction notification from the control apparatus with which the transfer setting cancel notification is synthesized. 
     
     
         25 . The router according to  claim 23 , wherein the communication means receives a notification for instructing cancel of communication with the control apparatus from the control apparatus, with which the transfer setting cancel notification is synthesized. 
     
     
         26 . The router according to  claim 24 , wherein, when it is detected that there is no data in a buffer to be transferred with respect to the mobile terminal, the control means sends a notification for canceling transfer setting to the router at the movement destination. 
     
     
         27 . The router according to  claim 24 , wherein, when a communication termination notification is received from the mobile terminal or when an abnormal communication termination of the mobile terminal is detected, the control means sends a notification for canceling transfer setting to the router at the movement destination. 
     
     
         28 . A communication method that, using a network base IP mobility protocol, causes a mobile terminal to send and receive data from a router belonging in a same link with a uniquely applied address, and when the mobile terminal moves to another network, causes a control apparatus to perform control to switch communication of the mobile terminal, wherein
 the mobile terminal is caused to execute:   a step of generating a notification including an identifier of the mobile terminal; and   a step of sending the notification to the router at a movement destination;   the router at the movement destination is caused to execute:   a step of generating a notification including the identifier of the mobile terminal and an identifier of the router; and   a step of sending the notification to the control apparatus; and   the control apparatus is caused to execute:   a step of generating a transfer instruction notification for instructing transfer of data from the router at a movement source to the router at the movement destination; and   a step of sending the transfer instruction notification to the router at the movement source or the movement destination.   
     
     
         29 . The communication method according to  claim 28 , wherein the router at the movement destination is caused to send the identifier of the mobile terminal to an information management apparatus that performs an authentication, and the router at the movement destination receives information including address setting information of the mobile terminal and the control apparatus from the information management apparatus. 
     
     
         30 . The communication method according to  claim 28 , wherein, when the mobile terminal is moved, the control apparatus is caused to send data through the router at the movement source and the router at the movement destination to the mobile terminal, and after communication of the control apparatus and the router at the movement destination and communication of the router at the movement destination and the mobile terminal are established, the control apparatus is caused to send data only through the router at the movement destination to the mobile terminal. 
     
     
         31 . The communication method according to  claim 29  or  30 , wherein, when the router at the movement source has received by transfer data addressed to the mobile terminal from another router, the control apparatus is caused to send to the router at the movement source a transfer cancel instruction notification for instructing cancel of setting for the transfer.