Abstract: A mobile station for a CDMA communication system which comprises a transmitting section that transmits a location registration request signal to a base station, and a receiving section that receives an acknowledge signal transmitted from the base station after the location registration request signal from the transmitting section is received by the base station. A control section prohibits the power supply to the receiving section for a predetermined period of time if the acknowledge signal from the base station is not received within a predetermined period of time after the location registration request signal has been transmitted.

Abstract: A mobile station for a CDMA communication system which comprises a transmitting section that transmits a location registration request signal to a base station, and a receiving section that receives an acknowledge signal transmitted from the base station after the location registration request signal from the transmitting section is received by the base station. A control section prohibits the power supply to the receiving section for a predetermined period of time if the acknowledge signal from the base station is not received within a predetermined period of time after the location registration request signal has been transmitted.

Abstract: A mobile station for a CDMA communication system which comprises a transmitting section that transmits a location registration request signal to a base station, and a receiving section that receives an acknowledge signal transmitted from the base station after the location registration request signal from the transmitting section is received by the base station. A control section prohibits the power supply to the receiving section for a predetermined period of time if the acknowledge signal from the base station is not received within a predetermined period of time after the location registration request signal has been transmitted.

Abstract: According to the present invention, one antenna (10b) receives a signal, and a handoff determination means (100a) monitors Ec/Io obtained by a searcher (16a) and determines whether a handoff condition is met or not. When the handoff condition is met, a switching control means (100b) switches the antenna used for reception to the other remaining antenna (18) to receive a signal. When a further handoff condition is met or only when a handoff condition is met in response to signals received by the two antennas (10 and 18), handoff control is performed.

Abstract: A control section comprises receiving energy estimating means for estimating Ec/Io of a receiving signal and switch change control means for changing antennas, in order to implement new control functions. If Ec/Io of the signal received via a selected antenna is lower than a preset level at the incoming or outgoing call time or at the communication time, reception is temporarily executed via the other antenna to detect Ec/Io. After that, the antenna having preferable Ec/Io is employed for the reception.

Abstract: In idle handover control, the reception quality of a synchronized pilot channel is classified into quality class “1” with which data can be received without any error, quality class “2” with which data can be received within an allowable error range, or quality class “3” with which data is difficult to receive with high quality, and different thresholds, i.e., 6 dB, 4 dB, and 2 dB, are respectively set for these quality classes. It is checked whether the reception quality of another pilot channel as a synchronization establishment candidate is higher than that of the synchronized pilot channel by a threshold corresponding to a quality class into which the synchronized pilot channel is classified or more. If it is determined that the reception quality of the synchronization establishment candidate is higher by the threshold or more, handover processing is performed. Otherwise, synchronization with the synchronized pilot channel is maintained without handover processing.

Abstract: A dual mode cellular radio communication apparatus having a received signal strength measuring function is disclosed. The measured strength of the signal may be corrected when the apparatus operates in the digital mode. The value of corrected strength may be used for indicating the received signal strength to a user of the apparatus and for reporting the received signal strength to a base station. Similarly, the measured strength of the signal may be corrected for indicating the received signal strength to a user of the apparatus when the apparatus operates in the analog mode.