Patent ID: 11924851
Assignee: SUN PATENT TRUST
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A communication apparatus comprising:
a transmitter, which, in operation, (a) transmits first downlink resource allocation information for a first downlink component carrier, (b) transmits second downlink resource allocation information for a second downlink component carrier, which is different from the first downlink component carrier, (c) transmits first downlink data on the first downlink component carrier in accordance with the first downlink resource allocation information, (d) transmits second downlink data on the second downlink component carrier in accordance with the second downlink resource allocation information, and (e) transmits uplink resource allocation information for an uplink component carrier on one out of the first downlink component carrier and the second downlink component carrier; and
a receiver, which, in operation, receives uplink data on the uplink component carriers in accordance with the uplink resource allocation information,
wherein the transmitter, in operation, transmits an Acknowledgement/Negative-acknowledgement (ACK/NACK) signal for the uplink data in a physical hybrid-ARQ indicator channel (PHICH) only on said one downlink component carrier on which the uplink resource allocation information is transmitted, and a resource of the PHICH is determined based on the uplink resource allocation information.