Patent ID: 8190208

Claim:
A base station in which a terminal is accommodated and the terminal is voice communicated with another terminal by VoIP, the base station comprising: a data rate operation/management unit which operates and stores a time-averaged data rate Rave of the terminal; a threshold value operation/management unit which obtains a current communication data rate R of the terminal to operate and store R/Rave; and a delay management unit which determines whether delay occurs or not on the basis of comparison of the R/Rave to a threshold level Th, and controls to reduce the delay, wherein the base station assigns voice packets to a plurality of slots and transmits the plurality of slots to a terminal, wherein a number of the slots is determined by a data rate for the terminal, and wherein the delay management unit, in a case where the delay is determined to occur, discards one or more voice packet to be modulated or one or more slot to be transmitted according to a predetermined discarding scheme, to reduce the delay.