Patent ID: 7885652

Claim:
A mobile station comprising: a retransmission control section configured to perform retransmission control of user data in a physical layer and a MAC sublayer with one or more radio base stations; and a threshold setting section configured to set a threshold used for determining presence or absence of an acknowledgement signal of the user data, according to the number of the radio base stations to which the mobile station connects, and wherein the threshold setting section is configured to set the threshold so that a probability of a DTX appearing as an ACK when the mobile station connects to a plurality of radio base stations is lower than the probability of the DTX appearing as an ACK when the mobile station connects to one radio station, wherein the DTX appearing as an ACK is a situation where a transmitting apparatus detects the acknowledgement signal even if a receiving apparatus does not transmit the acknowledgement signal when the receiving apparatus is not aware of a data transmission from the transmitting apparatus.