CPC H04W 72/21 (2023.01) [H04L 1/1678 (2013.01); H04L 1/1861 (2013.01); H04W 72/00 (2013.01); H04W 72/0446 (2013.01); H04W 72/23 (2023.01); H04W 88/02 (2013.01); H04W 88/08 (2013.01)] | 12 Claims |
1. A communication apparatus comprising:
a receiver, which, in operation, receives downlink control information (DCI) mapped in a search space set of a physical downlink shared channel (PDSCH); and
a transmitter, which, in operation, transmits a response signal on a physical uplink control channel (PUCCH) resource, the PUCCH resource being determined based on a control channel element (CCE) index to which the DCI is mapped and a first offset value,
wherein
the first offset value is determined from a plurality of offset values including a variable offset, the variable offset being calculated using a formula that includes a parameter relating to a size of the search space set,
the size of the search space set for a special subframe is smaller than the size of the search space set for a non-special subframe,
the variable offset is a negative value, and
the first offset value is determined based on information relating to an ACK/NACK resource of the DCI.
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