Patent ID: 8305973

Claim:
A mobile communication system in which a base station device and a plurality of mobile station devices perform communications by using a frame containing a downlink frame consisting of a plurality of sub-channels, wherein the base station device comprises: a downlink intra-frame region specifying unit configured to specify a region in the downlink frame to be specified by at least the sub-channel, for each of the plurality of mobile station devices, wherein the downlink intra-frame region specifying unit specifies the region in the downlink frame, depending on communication quality of each of the sub-channels; a downlink intra-frame region information transmitter configured to transmit downlink intra-frame region information to each of the mobile station device, the downlink intra-frame region information indicating a region in the downlink frame specified by the downlink intra-frame region specifying unit; a communication data region specifying unit configured to specify a region in the frame that is to contain communication data, for each of the plurality of mobile station devices; an intra-frame region specifying information generator configured to generate intra-frame region specifying information indicating the intra-frame region specified by the communication data region specifying unit; and a downlink frame transmitter configured to transmit a downlink frame containing the intra-frame region specifying information, which is generated by the intra-frame region specifying information generator, in all or a part of the downlink intra-frame region specified by the downlink intra-frame region specifying unit; each of the mobile station devices comprises: a downlink intra-frame region information receiver configured to receive the downlink intra-frame region information transmitted by the downlink intra-frame region information transmitter; and an intra-frame region specifying information acquisition unit configured to receive the downlink frame transmitted by the downlink frame transmitter on the basis of the downlink intra-frame region information received by the downlink intra-frame region information receiver, and to acquire the intra-frame region specifying information contained in the downlink frame, and the base station device performs communications with each of the mobile station devices by using a frame containing communication data in the intra-frame region specified by the intra-frame region specifying information.