Subband decision method, base station, subscriber device and communication system for information feedback

The invention relates to a subband decision method, a base station, a subscriber device and a communication system for information feedback. In the invention, the size of a subband is calculated by the base station according to the system bandwidth so as to divide the subband, partial subbands are selected to form a subband group which is configured to the subscriber device, and the information of the subband group is notified to the subscriber device; the subscriber device recalculates the size of the corresponding subband and the subband number which needs to be fed back according to the size of the configured subband group to divide the subbands, and the information of the subbands with the corresponding number is fed back to the base station; the base station optimizes a transmitter according to the information fed back by the subscriber device, and consequently, under the precondition that the service quality of a wireless subdistrict is considered, the performance of the system is increased. The method effectively and simply feeds back the information of a down-link, reduces the expense of an up-link in the air and increases the feedback precision, and consequently, the frequency spectrum resources are saved, and the system performance is increased.