Patent ID: 8380199

Claim:
A mobile communication system, comprising: a first wireless base station connected to a superior apparatus and serving as a handover source station for a mobile station; and a second wireless base station connected to the superior apparatus and serving as a handover target station for the mobile station, the mobile station establishing a wireless connection with one of the first and second wireless base stations by use of a wireless channel shared between or among a plurality of mobile stations, wherein the first wireless base station forwards data received from the superior apparatus and addressed to the mobile station to the mobile station in a case of receiving none of a handover request message from the mobile station keeping the wireless connection with the first wireless base station itself, and the first wireless base station forwards a part or a whole of data addressed to the mobile station and received from the superior apparatus after receiving the handover request message to the second wireless base station in a case of receiving the handover request message from the mobile station and transmitting a handover process request message in response to this handover request message to the second wireless base station, the second wireless base station forwards, through a handover process corresponding to the handover process request message sent from the first wireless base station, both of the data forwarded from the first wireless base station and the data transmitted from the superior apparatus and addressed to the mobile station by switching over a data transmission destination in the superior apparatus through the handover process to the mobile station of which the wireless connection with the first wireless base station is switched over to the wireless connection with the second wireless base station itself, and the first wireless base station notifies the second wireless base station of information used for the second wireless base station to determine a reception allowable period of the part of or the whole of data addressed to the mobile station, received from the superior apparatus and forwarded by the first wireless base station, wherein the reception allowable period is determined on the basis of a data forwarding period, of which the first wireless base station notifies of as the information, used for the first wireless base station forwarding data to the second wireless base station.