Patent ID: 7519029

Claim:
A radio communication system comprising a base station, a mobile station, and a relay station having a relaying function in multihop packet transmission, and configured to perform communication based on a wireless packet transmission system, wherein a receiver station in the multihop packet transmission comprises: interference level measuring means for measuring an interference level at the time of receiving a first packet; desired signal level calculating means for calculating a desired signal level on the basis of the interference level obtained in the measurement; and desired signal level notifying means for notifying a sender station of the desired signal level thus calculated; and wherein the sender station comprises: transmission power amount calculating means for calculating a transmission power amount of a second packet on the basis of the desired signal level notified of by the receiver station; and determining means for determining whether the second packet is transmissible to the receiver station, on the basis of the transmission power amount calculated by the transmission power amount calculating means.