Patent ID: 9602252
Date: 2017-03-21
CPC Classifications: H04L,H04W

Claim:
1. A radio communication terminal comprising: a receiver, which, in operation, receives, via an enhanced physical downlink control channel (E-PDCCH), a control signal including an ACK/NACK indicator, wherein the ACK/NACK indicator takes one of four possible values including a first value and a second value; and a controller, which, in operation, determines, based on the ACK/NACK indicator and an enhanced control channel element (eCCE) number of the received E-PDCCH, a resource number to transmit an ACK/NACK signal for downlink data using a dynamic ACK/NACK resource dynamically allocated in accordance with the control signal, wherein the controller, in operation, determines a first resource number as the resource number when the ACK/NACK indicator takes the first value and determines a second resource number as the resource number when the ACK/NACK indicator takes the second value, wherein a value of the difference between the first resource number and the second resource number is 1; and a transmitter, which, in operation, transmits the ACK/NACK signal using the dynamic ACK/NACK resource having the determined resource number when the ACK/NACK indicator takes the first value or the second value.