To improve the continuity of communication service in handover between different kinds of networks.
The radio terminal apparatus 1 obtains, based on a beacon signal transmitted from a base station 2 of a radio network system; information associated with a communication environment when it is connected with the radio network system via the base station 2, and stores the communication environment information in the observation database 13, and further transmits communication environment information in the observation database 13 to a basestation 2 (AP-c) during connection. The radio terminal apparatus 1 obtains communication environment information associated with an adjacent base station from the base station 2 (AP-c) during connection in handover request generation and determines a base station that is a handover destination candidate based on the obtained communication environment information and the communication environment information in the observation database 13.
INAMURA KATSUKI
TANAKA TOSHIAKI
JAPAN BROADCASTING CORP
JP2003259433A | 2003-09-12 | |||
JP2007143165A | 2007-06-07 | |||
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WO2007029881A2 | 2007-03-15 |