Patent ID: 6263200
Filing Date: 2001-07-17
Classification: H04W,Y02D

Abstract:
A radio terminal apparatus comprising:a signal receiving circuit for receiving an externally supplied signal;a power supply for supplying electric power;judging means for judging a reception signal field strength based on said externally supplied signal;a power supply control unit for selectively varying a duty cycle for supplying the electric power from said power supply to said signal receiving circuit, said power supplied during a predetermined frame of a power supplying period, said duty cycle based on the reception signal field strength judged by said judging means; and said radio terminal apparatus further comprising:a remaining power detecting unit for detecting remaining power of said power supply, andwherein said power supply control unit:intermittently supplies the electric power from said power supply to said signal receiving circuit for a predetermined time period irrelevant to the remaining power quantity detected by said remaining power detecting unit when said judging means judges that said reception signal field strength < a first predetermined value ""A"";intermittently supplies the electric power from said power supply to said signal receiving circuit only within a time duration determined based on the remaining power quantity detected by said remaining power detecting unit when said judging means judges that a second predetermined value ""B"".gtoreq. said reception signal field strength .gtoreq. said first predetermined value ""A"", said second predetermined value ""B"" being larger than said first predetermined value ""A""; andintermittently supplies the electric power from said power supply to said signal receiving circuit irrelevant to the remaining power detected by said remaining power detecting unit, based on a number of times of continuous reception of a call signal notified from a radio base station control apparatus via said radio base station apparatus when said judging means judges that said reception signal field strength > said second predetermined value ""B"".