CPC H04W 74/006 (2013.01) [H04L 5/001 (2013.01); H04L 5/0032 (2013.01); H04L 5/0053 (2013.01); H04L 5/0094 (2013.01); H04W 72/23 (2023.01); H04L 1/1635 (2013.01); H04L 1/1835 (2013.01); H04L 5/0044 (2013.01); H04L 5/0055 (2013.01); H04L 5/0064 (2013.01); H04W 72/0453 (2013.01); H04W 84/042 (2013.01)] | 12 Claims |
1. A communication apparatus, comprising:
a transmitter, which, in operation, transmits downlink assignment information indicating a resource in a primary cell, first downlink data on the resource in the primary cell, and second downlink data in a secondary cell; and
a receiver, which, in operation, receives a response signal for the first downlink data and the second downlink data, wherein
in response to transmitting, via the transmitter, the downlink assignment information in a first control channel on a Control Channel Element (CCE) of a Physical Downlink Control Channel (PDCCH) region, the receiver, in operation, receives the response signal on one of a first set of uplink resources including a first resource, the first resource determined by a first method, wherein the first method determines the first resource based on an index of the CCE of the PDCCH region on which the downlink assignment information is transmitted; and
in response to transmitting, via the transmitter, the downlink assignment information in a second control channel different from the first control channel, the receiver, in operation, receives the response signal on one of a second set of uplink resources including a second resource, the second resource determined by a second method different from the first method.
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