Mobile telecommunication system and channel handoff system between the mobile telecommunication systems

摘要

The telecommunication system has mobile telecommunication systems located with their coverage service areas overlapped with each other. Each of the mobile telecommunication systems provides a communication service to a mobile telephone terminal through a radio base station and a radio base station control unit. The radio base station control unit controls communication processing of the radio base station and the mobile telephone terminal. The radio base station control unit has a first means for providing a hard-handoff command signal to command the mobile telephone terminal to execute a hard handoff when the mobile telephone terminal is in the overlapped service area. The hard-handoff command signal is prescribed to become effective at a predetermined time after the mobile telephone terminal receives the hard-handoff command signal. The radio base station control unit has also a second means for providing a hard-handoff command cancellation signal to command the mobile telephone terminal to cancel the hard-handoff command signal when the hard-handoff command signal has not become effective yet. The mobile telephone terminal has means for executing cancellation of the hard-handoff command signal in response to the hard-handoff command cancellation signal.