Patent ID: 9723594
Date: 2017-08-01
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method for transmitting control information at a user equipment (UE) in a wireless communication system supporting carrier aggregation of a plurality of cells, the method comprising: spreading a control information block corresponding to one single carrier frequency division multiplexing (SC-FDMA) symbol, such that spread control information blocks correspond to a first plurality of SC-FDMA symbols, wherein the control information block includes HARQ-ACK (hybrid automatic repeat request acknowledgement) signals corresponding to downlink signals received via the plurality of cells; DFT (discrete Fourier transform)-precoding the spread control information blocks on an SC-FDMA symbol basis; generating a plurality of reference signal sequences corresponding to a second plurality of SC-FDMA symbols, wherein each of the plurality of reference signal sequences is generated by circular-shifting a base sequence; transmitting the DFT-precoded control information blocks through the first plurality of SC-FDMA symbols in a subframe through at least one antenna; and transmitting the plurality of reference signal sequences through the second plurality of SC-FDMA symbols in the subframe through the at least one antenna, wherein an orthogonal code is applied to the plurality of reference signal sequences in a time domain.