Communication apparatus and retransmission control method
First Claim
1. A communication apparatus comprising:
- a receiver, which, in operation, in case of carrier aggregation aggregating a primary cell and one or more secondary cells, receives a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from another communication apparatus in the primary cell and not in the one or more secondary cells;
a retransmission controller, which, in operation, controls retransmission of data to the other communication apparatus in the primary cell based on the PHICH and assignment control information received in the primary cell, andcontrols retransmission of data to the other communication apparatus in the one or more secondary cells based on assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH; and
a transmitter, which, in operation, transmits the retransmission data on a physical uplink shared channel (PUSCH).
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Abstract
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.
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Citations
14 Claims
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1. A communication apparatus comprising:
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a receiver, which, in operation, in case of carrier aggregation aggregating a primary cell and one or more secondary cells, receives a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from another communication apparatus in the primary cell and not in the one or more secondary cells; a retransmission controller, which, in operation, controls retransmission of data to the other communication apparatus in the primary cell based on the PHICH and assignment control information received in the primary cell, and controls retransmission of data to the other communication apparatus in the one or more secondary cells based on assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH; and a transmitter, which, in operation, transmits the retransmission data on a physical uplink shared channel (PUSCH). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A retransmission control method comprising:
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in case of carrier aggregation aggregating a primary cell and one or more secondary cells, a first communication apparatus receiving a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from a second communication apparatus in the primary cell and not in the one or more secondary cells; the first communication apparatus controlling retransmission of data to the second communication apparatus in the primary cell based on the PHICH and assignment control information received in the primary cell; the first communication apparatus controlling retransmission of data to the second communication apparatus in the one or more secondary cells based on assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH; and the first communication apparatus transmitting the retransmission data on a physical uplink shared channel (PUSCH). - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification