COMMUNICATION APPARATUS AND COMMUNICATION METHOD

摘要

To improve throughput by reducing the resource used for transmitting a parameter relating to retransmission control and decreasing overhead of retransmission control signaling. Where a retransmission control method is employed with adaptive MCS control in which the encoding rate can be changed, the scheduling section sets the MCS in accordance with CQI notified from the communication counterpart apparatus. When transmission data is encoded, the RV parameter bit-number setting section sets the number of bits used for signaling the RV parameter to decrease as the encoding rate of the first transmission is decreased and sets the RV parameter based on the number of bits. For example, in a case where the encoding rate R is R>2/3, two bits are set. In a case where the encoding rate 1/3

主权项

1. A communication apparatus comprising:
a receiver, which, in operation, receives control information and transmission data, the control information including a MCS (Modulation and Coding Scheme) and RV information indicating a RV parameter, and the RV parameter indicating a start position of the transmission data in data that is encoded; and circuitry, which, in operation: determines the RV parameter that is set based on the RV information; and decodes the received transmission data based on the MCS and the RV parameter, wherein: a number of bits of the RV information is set according to a granularity of control; when a number of bits of the RV information is two, the RV parameter is set to any one among 0, 1, 2 and 3; and when a number of bits of the RV information is zero, the control information includes no RV information and the RV parameter is set to 0.