Patent ID: 7502593

Claim:
A communication system having a base station apparatus that is controlled by a base station control apparatus and that performs data transmission to and reception from a mobile station apparatus by way of a high speed downlink packet access mode or a dedicated downlink physical channel mode, said communication system comprising: said base station apparatus, which comprises: a first data transmission section that performs data transmission by way of said high speed downlink packet access mode; a second data transmission section that performs data transmission by way of said dedicated downlink physical channel mode; a quality deficiency signal generation section that generates a quality deficiency signal when reception quality at the mobile station apparatus that performs data transmission by way of said high speed downlink packet access mode is lower than a predetermined threshold value; a quality deficiency signal reporting section that reports the quality deficiency signal to the base station control apparatus; and a control section that controls the first data transmission section and the second data transmission section to perform data transmission by way of a transmission scheme determined by said base station control apparatus based on the quality deficiency signal, and said base station control apparatus comprises a control signal transmission section that transmits a control signal to the base station apparatus so that when the number of times said quality deficiency signal is reported per unit time is greater than a predetermined number of times, data transmission for the mobile station apparatus is switched from the high speed downlink packet access mode to the dedicated downlink physical channel mode.