Patent ID: 9572138
Date: 2017-02-14
CPC Classifications: H04L,H04W

Claim:
1. A method for transmitting control information to a base station by a user equipment in a wireless communication system supporting aggregation of a plurality of serving cells, the user equipment being configured with the plurality of serving cells including a primary cell and a secondary cell operating in time division duplex (TDD), the method comprising: receiving each of a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) from the base station in a downlink subframe through a respective one of the primary cell and secondary cell; and transmitting control information regarding the received PDSCH to the base station in an uplink subframe of the primary cell or the secondary cell, wherein, when the primary cell has a first uplink-downlink (UL-DL) configuration and the secondary cell has a second UL-DL configuration different from the first UL-DL configuration, an UL-DL timing relation of each of the primary cell and secondary cell is selected to be equal to a timing relation of the one of the first UL-DL configuration or the second UL-DL configuration having a smallest number of uplink subframes, and wherein each of the first UL-DL configuration and the second UL-DL configuration includes at least one uplink subframe.