Patent ID: 7437152

Claim:
A CDMA mobile communication system including a mobile station communicating with a plurality of base stations, each of said base stations comprising: perch channel transmitting means for transmitting a perch channel to the mobile station; and paging signal transmitting means for transmitting a paging signal to the mobile station, and said mobile station comprising: base station decision means for deciding a base station said mobile station waits for or communicates with through the perch channel by receiving a plurality of perch channels transmitted by said perch channel transmitting means; paging signal reception decision means for deciding in an idle mode as to whether the paging signal transmitted from one of the plurality of based stations to a mobile station group which includes said mobile station by said paging signal transmitting means is received or not by intermittent reception; and receiving quality measurement means for measuring the receiving quality of the perch channels, wherein said receiving quality measurement means carries out the measurement of the receiving quality of the plurality of perch channels in synchronization with timing of receiving the paging signal when said paging signal reception decision means decides that the paging signal is received.