Patent ID: 9337967
Filing Date: 2016-05-10
CPC Classification: H04J,H04L,H04W

Claim Text:
1. A method by a terminal in a wireless communication system supporting carrier aggregation, the method comprising: receiving a control message for activating a secondary cell from a base station in a first sub-frame; transmitting first channel status information (CSI) of the secondary cell in a second sub-frame that occurs at least 8 sub-frames after the first sub-frame; and transmitting a sounding reference signal (SRS) for the secondary cell no earlier than the second sub-frame, wherein, if the first CSI of the secondary cell is invalid, the first CSI of the secondary cell is set to 0, and wherein if the first CSI of the secondary cell is valid, the valid first CSI of the secondary cell is selected from 1 to 15 based on actual measurement of the secondary cell.