Patent ID: 8130716

Claim:
A radio base station for a radio communication system that employs adaptive rate control where a communication rate is changed according to the quality of a radio channel, the radio base station comprising: a radio receiver for receiving an upstream signal that includes request rate information, from a radio terminal; a radio base station controller for comparing the request rate information, included in the upstream signal received by the radio receiver, with a threshold determined in advance, when the request rate information is equal to or larger than the threshold, for determining that the quality of a radio channel with the radio terminal is relatively high, and for performing scheduling such that packet data is to be sent with a short slot, which means a slot length used is short or the number of slots used is small, and when the request rate information is smaller than, the threshold, for determining that the quality of the radio channel with the radio terminal is relatively low, and for determining whether, if a part of packet data to be sent is discarded prior to the transmission, the part will be recovered and for performing scheduling, when the part will be recovered such that the part is discarded and a corresponding slot is assigned to another packet data to be sent to another radio terminal; and a radio transmitter for transmitting the packet data to the radio terminal or the another packet data to the another radio terminal according to the scheduling performed by the radio base station controller.