Communication apparatus and retransmission control method
First Claim
1. A communication apparatus comprising:
- a receiver which, in operation, receives a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from another communication apparatus, uses the PHICH received in a primary cell, and does not use the PHICH received in one or more secondary cells in extension carriers; and
a retransmission controller which, in operation, controls;
retransmission of data to the other communication apparatus in the primary cell based on the PHICH that is used and based on assignment control information received in the primary cell, andretransmission of data to the other communication apparatus in the one or more secondary cells based on the assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH.
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Accused Products
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.
27 Citations
20 Claims
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1. A communication apparatus comprising:
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a receiver which, in operation, receives a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from another communication apparatus, uses the PHICH received in a primary cell, and does not use the PHICH received in one or more secondary cells in extension carriers; and a retransmission controller which, in operation, controls; retransmission of data to the other communication apparatus in the primary cell based on the PHICH that is used and based on assignment control information received in the primary cell, and retransmission of data to the other communication apparatus in the one or more secondary cells based on the assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH. - View Dependent Claims (2, 3, 4, 5)
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6. A communication apparatus comprising:
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a receiver which, in operation, receives a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from another communication apparatus, uses the PHICH corresponding to a physical uplink shared channel (PUSCH) assigned to a primary cell, and does not use the PHICH corresponding to a PUSCH assigned to one or more secondary cells in extension carriers; and a retransmission controller which, in operation, controls; retransmission of data to the other communication apparatus in the primary cell based on the PHICH that is used and based on assignment control information received in the primary cell, and retransmission of data to the other communication apparatus in the one or more secondary cells based on the assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH. - View Dependent Claims (7, 8, 9, 10)
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11. A retransmission control method comprising:
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a first communication apparatus receiving a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from a second communication apparatus, the first communication apparatus using the PHICH received in a primary cell, and not using the PHICH received in one or more secondary cells in extension carriers; the first communication apparatus controlling retransmission of data to the second communication apparatus in the primary cell based on the PHICH that is used and based on assignment control information received in the primary cell; and the first communication apparatus controlling retransmission of data to the second communication apparatus in the one or more secondary cells based on the assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH. - View Dependent Claims (12, 13, 14, 15)
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16. A retransmission control method comprising:
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a first communication apparatus receiving a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from a second communication apparatus, the first communication apparatus using the PHICH corresponding to a physical uplink shared channel (PUSCH) assigned to a primary cell, and not using the PHICH corresponding to a PUSCH assigned to one or more secondary cells in extension carriers; the first communication apparatus controlling retransmission of data to the second communication apparatus in the primary cell based on the PHICH that is used and based on assignment control information received in the primary cell; and the first communication apparatus controlling retransmission of data to the second communication apparatus in the one or more secondary cells based on the assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH. - View Dependent Claims (17, 18, 19, 20)
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Specification