Patent ID: 7486634

Claim:
A transmission apparatus adapted to retransmit data to a terminal for receiving data based on a Hybrid Automatic repeat ReQuest system, said transmission apparatus comprising: differential information calculating means for calculating differential information regarding a difference in received signal qualities at said terminal; control means for controlling a transmission parameter upon transmitting said data to said terminal based on said differential information; first generating means for generating an energy per bit value based on a current received signal quality and an increased power amount; second generating means for generating updated signal quality data based on the previous received signal quality and said current received signal quality and said increased power amount; and transmitting means for transmitting said data to said terminal in accordance with said transmission parameter and the energy per bit value, wherein when the current received signal quality is lower than the previous received signal quality by a predetermined amount and the increased power amount to improve the received signal quality is smaller than or equal to a maximum transmission power allowed to be assigned to a single user at that time, the previous received signal quality is replaced by the addition of the previous received signal quality, the current received signal quality, and the increased power amount.