Patent ID: 9706539
Date: 2017-07-11
CPC Classifications: H04L,H04W

Claim:
1. A radio communication terminal comprising: a receiver which, in operation, receives a control signal including an ACK/NACK Resource Indicator (ARI) via an Enhanced Physical Downlink Control Channel (E-PDCCH) set among one or a plurality of E-PDCCH sets; a controller which, in operation, determines an ACK/NACK resource offset value based on the ARI and on a number of Enhanced Control Channel Elements (ECCEs) included in the E-PDCCH set via which the control signal including the ARI is received, and determines an ACK/NACK resource for transmitting an ACK/NACK signal based on the determined ACK/NACK resource offset value; and a transmitter which, in operation, transmits the ACK/NACK signal using the determined ACK/NACK resource, wherein the ARI has two bits and the ACK/NACK resource offset value takes four possible values based on the two bits including a first value associated with 0, a second value associated with a fixed offset, and third and fourth values associated with dynamic offsets that depend on the number of ECCEs.