Patent ID: 8842561

Claim:
A user equipment terminal for communicating with a base station apparatus using HARQ for uplink, comprising: a transmission unit configured to transmit an uplink signal to the base station apparatus; a reception unit configured to receive a control signal indicating whether the uplink signal is to be retransmitted; a decoding unit configured to consider the control signal as ACK when an absolute value of reception quality of the control signal is low, and determine whether the control signal indicates ACK or NACK based on information in the control signal when the absolute value of reception quality of the control signal is high; wherein when the absolute value of reception quality of the control signal is high, the decoding unit considers the control signal as ACK when a sign of the information in the control signal is “+”, and considers the control signal as NACK when the sign of the information in the control signal is “−”; and the decoding unit defines a predetermined threshold, considers the control signal as ACK when the absolute value of reception quality of the control signal is below the predetermined threshold, and determines whether the control signal indicates ACK or NACK based on information in the control signal when the absolute value of reception quality of the control signal is above the predetermined threshold.