Communication apparatus and retransmission control method

摘要

Provided is a wireless communication device. A PHICH reception unit determines whether a received signal in a PHICH region is an ACK signal or a NACK signal. When doing so, the PHICH reception unit does not receive a PHICH in a subframe in which a terminal monitors an E-PDCCH. A control signal reception unit outputs a retransmission prompting signal to a signal allocation unit when the signal outputted from the PHICH reception unit is a NACK signal and when a UL grant was not detected. Meanwhile, when a UL grant was detected, the control signal reception unit outputs the detected UL grant to the signal allocation unit. The signal allocation unit maps the transmission signal in accordance with the retransmission prompting signal and the UL grant and transmits the transmission signal from a wireless transmission unit.

主权项

1. A communication apparatus comprising:
a physical HARQ indicator channel (PHICH) receiver that, when receiving a PHICH including an ACK or NACK transmitted from another communication apparatus without using cross-carrier scheduling, does not use the PHICH in one or more secondly cells, but uses the PHICH received in a primary cell; and a retransmission controller that, in operation, controls whether to perform retransmission to the other communication apparatus, based on the received and used PHICH and assignment control information.