Terminal apparatus and communication method thereof

摘要

This invention is directed to a terminal apparatus capable of preventing the degradation of reception quality of control information even in a case of employing SU-MIMO transmission system. A terminal (200), which uses a plurality of different layers to transmit two code words in which control information is placed, comprises: a resource amount determining unit (204) that determines, based on a lower one of the encoding rates of the two code words or based on the average value of the reciprocals of the encoding rates of the two code words, resource amounts of control information in the respective ones of the plurality of layers; and a transport signal forming unit (205) that places, in the two code words, the control information modulated by use of the resource amounts, thereby forming a transport signal.

主权项

1. A terminal apparatus, comprising:
a receiver which, in operation, receives downlink data; detection circuitry, which, in operation, performs error detection of the received downlink data and generates ACK/NACK information indicating the error detection results; resource amount determination circuitry, which, in operation, determines an amount of resource per layer for transmitting the ACK/NACK information on all of a plurality of layers corresponding to a first code word and a second code word, the amount of resource per layer being determined by dividing a number of bits of the ACK/NACK information by a sum of first coding rate for the first code word and second coding rate for the second code word and by multiplying the divided result with an offset amount for a physical uplink shared channel (PUSCH), with the first coding rate for the first code word being acquired by dividing a number of bits of the first code word by a product of a PUSCH transmission bandwidth for the first code word and a number of transmission symbols on each layer for the first code word, and the second coding rate for the second code word being acquired by dividing a number of bits of the second code word by a product of a PUSCH transmission bandwidth for the second code word and a number of transmission symbols on each layer for the second code word; and a transmitter which, in operation, maps the ACK/NACK information on respective PUSCH of all of the plurality of layers corresponding to the first code word and the second code word and transmits the mapped ACK/NACK information using the determined amount of resource per layer.