Radio communication system, base station, gateway, and radio communication method

Abstract

The radio communication system of the present invention includes a base station ( 10 ), a mobility management node ( 20 ), and a gateway ( 30 ). The base station ( 10 ) transmits to the mobility management node ( 20 ) information of the origination addresses of neighboring base stations of the base station ( 10 ). The mobility management node ( 20 ) receives information of the origination addresses of the neighboring base stations from the base station ( 10 ) and transmits the information of the origination addresses of the neighboring base stations to the gateway ( 30 ). The gateway ( 30 ) receives information of the origination addresses of the neighboring base stations from the mobility management node ( 20 ).

What is claimed is: 
     
       1. A radio communication system comprising a base station, a mobility management node, and a gateway, wherein:
 said base station transmits information of origination addresses of one or more neighboring base stations of said base station to said mobility management node; 
 said mobility management node receives the information of the origination addresses of said one or more neighboring base stations from said base station, and transmits the information of the origination addresses of said one or more neighboring base stations to said gateway; and 
 said gateway receives the information of the origination addresses of said one or more neighboring base stations from said mobility management node; saves the information of the origination addresses of said one or more neighboring base stations; and collates an origination address of packet data transmitted to the gateway from a movement destination base station with which a radio communication apparatus has performed handover with said saved origination addresses and verifies safety of the packet data received by the gateway; and 
 wherein when said base station becomes said movement destination base station, the base station transmits to said mobility management node the information of the origination addresses of said one or more neighboring base stations of said base station. 
 
     
     
       2. The radio communication system as set forth in  claim 1 , wherein said base station, at times of attach to said base station by a radio communication apparatus, transmits to said mobility management node the information of origination addresses of said one or more neighboring base stations. 
     
     
       3. The radio communication system as set forth in  claim 1 , wherein said base station, at times of call origination of a radio communication apparatus, transmits to said mobility management node the information of origination addresses of said one or more neighboring base stations. 
     
     
       4. The radio communication system as set forth in  claim 1 , wherein said base station, at times of location updating to said base station by a radio communication apparatus, transmits to said mobility management node the information of origination addresses of said one or more neighboring base stations. 
     
     
       5. The radio communication system as set forth in  claim 1 , wherein said base station, at times of startup of said base station, transmits to said mobility management node the information of origination addresses of said one or more neighboring base stations. 
     
     
       6. The radio communication system as set forth in  claim 1 , wherein:
 said base station, when said base station becomes said movement destination base station, transmits to said mobility management node information of the origination address of said base station; and 
 said gateway, when an origination address that matches the origination address of packet data received from said movement destination base station is not stored, collates the origination address of said received packet data with the origination address received from said movement destination base station. 
 
     
     
       7. The radio communication system as set forth in  claim 6 , wherein said gateway:
 after detection that an origination address that matches the origination address of packet data received from said movement destination base station is not saved, saves in a buffer packet data received from said movement destination base station within a fixed interval; and 
 when the origination address received from said movement destination base station matches an origination address of said received packet data within said fixed interval, transfers to a host node packet data that were saved in said buffer. 
 
     
     
       8. The radio communication system as set forth in  claim 6 , wherein said gateway after detection that an origination address that matches the origination address of packet data received from said movement destination base station is not saved, transfers to a host node the packet data that were received from said movement destination base station within a fixed interval. 
     
     
       9. The radio communication system as set forth in  claim 1 , wherein said base station, when said base station becomes said movement destination base station, transmits to said mobility management node information indicating that the origination address and termination address of said base station are identical. 
     
     
       10. A radio communication system comprising a base station, a mobility management node, and a gateway; wherein:
 said base station transmits to said mobility management node information of the origination address of a movement destination base station to which a radio communication apparatus has performed handover from said base station; 
 said mobility management node receives the information of the origination address of said movement destination base station from said base station, and transmits to said gateway information of the origination address of said movement destination base station; and 
 said gateway receives the information of the origination address of said movement destination base station from said mobility management node; saves the information of the origination address of said movement destination base station; and collates the origination address of packet data received from said movement destination base station with said saved origination addresses and verifies safety of the packet data received from said movement destination base station; and 
 wherein, when said base station becomes said movement destination base station, the base station transmits to said mobility management node information of the origination addresses of one or more neighboring base stations of said base station. 
 
     
     
       11. The radio communication system as set forth in  claim 10 , wherein said base station:
 when said base station becomes said movement destination base station, in response to a handover request from the movement origin base station, transmits to said movement origin base station the information of the origination address of said base station; and 
 when said base station becomes said movement origin base station, transmits to said mobility management node the information of the origination address of said movement destination base station that was received from said movement destination base station. 
 
     
     
       12. The radio communication system as set forth in  claim 10 , wherein said base station, before transmitting to said radio communication apparatus a message commanding handover, transmits origination address information of said gateway to said gateway by way of said mobility management node. 
     
     
       13. A base station comprising:
 a control unit that generates a message that comprises information of the origination addresses of one or more neighboring base stations of said base station; and 
 a transmission unit that transmits said message by way of a mobility management node to a gateway configured to receive the information of the origination addresses of said one or more neighboring base stations from said mobility management node, save the information of the origination addresses of said one or more neighboring base stations, and collate an origination address of packet data transmitted to the gateway from a movement destination base station with which a radio communication apparatus has performed handover with said saved origination addresses and verifies safety of the packet data received by the gateway. 
 
     
     
       14. A base station comprising:
 a control unit that generates a message comprising information of the origination address of a movement destination base station to which a radio communication apparatus has performed a handover from said base station; and 
 a transmission unit that transmits said message by way of a mobility management node to a gateway configured to receive the information of the origination address of said movement destination base station from said mobility management node, save the information of the origination address of said movement destination base station, and collate the origination address of packet data received from said movement destination base station with said saved origination addresses and verifies safety of the packet data received from said movement destination base station. 
 
     
     
       15. A radio communication method for a base station, the method comprising transmitting information of the origination addresses of one or more neighboring base stations of said base station to a gateway by way of a mobility management node;
 wherein, said transmitting information of the origination addresses of the one or more neighboring base stations of said base station to a gateway by way of a mobility management node is performed when said base station becomes a movement destination base station, and 
 wherein the gateway receives the information of the origination addresses of said one or more neighboring base stations from said mobility management node, saves the information of the origination addresses of said one or more neighboring base stations, and collates an origination address of packet data transmitted to the gateway from a movement destination base station with which a radio communication apparatus has performed handover with said saved origination addresses and verifies safety of the packet data received by the gateway. 
 
     
     
       16. A radio communication method for a base station, the method comprising transmitting, to a gateway by way of a mobility management node, information of the origination address of a movement destination base station with which a radio communication apparatus has performed handover from said base station;
 wherein, when said base station becomes a movement destination base station, said base station transmits, to said mobility management node, information of the origination addresses of neighboring base stations of said base station, and 
 wherein the gateway receives the information of the origination address of said movement destination base station from said mobility management node, saves the information of the origination address of said movement destination base station, and collates the origination address of packet data received from said movement destination base station with said saved origination addresses and verifies safety of the packet data received from said movement destination base station.