Patent ID: 9077533
Filing Date: 2015-07-07
Classification: H04L,H04W

Abstract:
1. A base station apparatus comprising: a transmitter which, in operation, transmits downlink data to a communication partner apparatus on a first component carrier, for which a transmission mode is set to support up to two transport blocks; a receiver which, in operation, receives from the communication partner apparatus a response signal indicative of a plurality of error detection results of the downlink data, wherein, when a semi-persistent scheduling (SPS) is activated for the first component carrier to periodically assign resources, the response signal is mapped to either one of a first physical uplink control channel (PUCCH) resource and a second PUCCH resource respectively indicated by a first PUCCH resource index and a second PUCCH resource index, the first PUCCH resource index is selected from a plurality of PUCCH resource indices by selecting a PUCCH resource index corresponding to a value of a transmission power control (TPC) command for an uplink control channel, and the second PUCCH resource index is selected from the plurality of PUCCH resource indices by selecting another PUCCH resource index which is a value generated by adding 1 to the selected first PUCCH resource index; and a retransmission controller which, in operation, determines necessity of retransmission of the downlink data based on the received response signal and to retransmit the downlink data.