Patent ID: 8396048

Claim:
A communication apparatus comprising: a first transfer unit for transferring a first packet received from a base station to a second home agent, wherein the first packet, to be sent from a first mobile station to a second mobile station as a destination, is being transferred to the second home agent, the first mobile station and the second mobile station being managed by a first home agent and the second home agent respectively, the first mobile station and the second mobile station being located in a region under control of the base station; a second transfer unit for transferring the first packet sent back from the second home agent to the base station, the first packet encapsulated at the second home agent so as to include an address of the second mobile station as a destination address; and a return instruction unit for issuing to the base station an instruction for directly transferring a second packet to the second mobile station when a predetermined condition is satisfied, the instruction being including information of a network address translation for resetting an address of the second home agent to an address of the first home agent, wherein the second packet to be sent from the first mobile station to the second mobile station as a destination is being transferred to the second home agent, wherein the return instruction unit does not issue the instruction to the base station when the predetermined condition is not satisfied.