Mobile communication system and mobile communication apparatus in which wait time is extended

A mobile communication apparatus comprising:

• a ratio unit including a transmission unit and a reception unit so as to perform transmission and reception with respect to a base station;
• a codec unit for encoding a speech signal and decoding an encoded signal;
• a speech signal processing unit for subjecting a speech signal to analog/digital conversion;
• a main control unit for controlling the entirety of the mobile communication apparatus;
• a power supply control unit for supplying an operating power from a battery to components of the mobile communication apparatus;
• and
• an intermittent reception ratio setting unit for setting an intermittent reception ratio between a period of calls from said base station to the mobile communication apparatus and a period of intermittent reception effected by associated periodic supply of the operating power from the battery, and for controlling said power supply control unit in accordance with the intermittent reception ratio;
• wherein said intermittent reception ratio setting unit comprises a memory for storing setting information containing a first bit indicating one of a permanently fixed setting and a fixed setting, a second bit indicating whether a basic intermittent reception ratio or an extended intermittent reception ratio is to be set, and a bit train indicating a factor by which the basic intermittent reception ratio is to be multiplied.