Patent ID: 8553613

Claim:
A mobile communication system comprising: a plurality of mobile station devices; and a base station device for performing communication with each of the mobile station devices by orthogonal frequency division multiplexing in a predetermined frequency band, wherein the base station device includes: a frequency band storage unit configured to store a plurality of fixed communication bandwidth frequency bands for a subchannel allocatable to each of the mobile station devices, in association with predetermined conditions related to communication quality; a communication quality acquisition unit configured to acquire communication quality in communication with each of the mobile station devices; and a frequency allocator configured to select a frequency band from among the plurality of fixed communication bandwidth frequency bands to be allocated as the subchannel to each of the mobile station devices from the frequency band storage unit on the basis of the communication quality acquired by the communication quality acquisition unit, and to notify the mobile station device of channel information indicating the selected frequency band, and each of the mobile station devices communicates with the base station device in the frequency band indicated by the channel information notified by the frequency allocator, wherein guard bands are provided between the fixed communication bandwidth frequency bands stored in the frequency band storage unit, wherein the guard bands vary in width from each other according to the communication quality such that the guard band width is independent of the fixed communication bandwidth, and the guard bands are stored in the frequency band storage unit.