Patent ID: 9270399
Filing Date: 2016-02-23
CPC Classification: H04B,H04J,H04L,H04W

Claim Text:
1. A method of transmitting positive-acknowledgement (ACK)/negative-acknowledgement (NACK) by a user equipment (UE) in a time division duplex (TDD)-based wireless communication system, the method comprising: receiving, by the UE from a base station (BS), M downlink subframes in each of a primary serving cell and a secondary serving cell, where M is an integer greater than two, and the M downlink subframes are associated with an uplink subframe n; and transmitting, by the UE to the BS in the uplink subframe n, an ACK/NACK response for the received M downlink subframes by using one resource selected from four candidate resources based on the received M downlink subframes, wherein, among the four candidate resources,