Patent ID: 8107418

Claim:
A mobile communication system comprising a base station apparatus and a mobile station apparatus, the base station apparatus transmitting a downlink signal comprising a downlink pilot channel, a downlink common control channel, a downlink shared control channel, and a downlink shared data channel, the mobile station apparatus setting an uplink control channel with the base station apparatus, measuring reception quality of the downlink signal, and transmitting downlink signal quality information CQI corresponding to the reception quality to the base station apparatus using the uplink control channel, the base station apparatus controlling transmission of data to the mobile station apparatus using the downlink signal quality information CQI, wherein the mobile station apparatus comprises a reception data judging means that judges whether data addressed to the own station contained in the downlink signal transmitted by the base station apparatus is present, and a reception control means that enters an intermittent reception mode that stops transmission of the downlink signal quality information CQI, that causes a receiving portion to operate during a pre-defined intermittent reception period, that stops the operation of the receiving portion in periods other than the pre-defined intermittent reception period, when the reception data judging means judges that no data addressed to the own station from the base station apparatus is present, and wherein the base station apparatus comprises a downlink signal quality information CQI judging means that judges whether the downlink signal quality information CQI transmitted from the mobile station apparatus is present, and a downlink signal control means that transmits the downlink signal to the mobile station apparatus during an intermittent receivable period when the downlink signal quality information CQI judging means judges that the downlink signal quality information CQI is not present and data addressed to the mobile station apparatus is present in an RLC packet data buffer.