Method and apparatus for transmitting control information in a wireless communication system
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method in which a terminal transmits control information in a wireless communication system, and to an apparatus for the method, wherein the method comprises the following steps: spreading a control information block corresponding to one single carrier frequency division multiplexing (SC-FDMA) symbol, such that the spread control information blocks correspond to a plurality of first SC-FDMA symbols; performing a discrete Fourier transform (DFT) precoding process on the spread control information blocks on an SC-FDMA symbol basis; transmitting, in the plurality of first SC-FDMA symbols in a subframe, the DFT precoded control information blocks; and transmitting, in a plurality of second SC-FDMA symbols in the subframe, a reference signal sequence, wherein an orthogonal code is applied to the plurality of second SC-FDMA symbols in a time domain.
1. A method for transmitting control information at a user equipment (UE) in a wireless communication system, 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 plurality of first SC-FDMA symbols;
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 plurality of second 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 plurality of first SC-FDMA symbols in a subframe through at least one antenna; and
transmitting the plurality of reference signal sequences through the plurality of second SC-FDMA symbols in the subframe through the at least one antenna,
wherein an orthogonal code is applied to the plurality of second SC-FDMA symbols in a time domain.
2. The method according to claim 1 , wherein the plurality of first SC-FDMA symbols and the plurality of second SC-FDMA symbols are transmitted through multiple antennas, and the orthogonal code applied to the plurality of second SC-FDMA symbols are differently configured for each of the multiple antennas.
3. The method according to claim 2 , wherein spreading codes used for the spreading the control information block are orthogonal between the multiple antennas.
4. The method according to claim 1 , wherein the orthogonal code is applied to the plurality of second SC-FDMA symbols at a slot level.
5. The method according to claim 4 , wherein an orthogonal code is additionally applied to the plurality of second SC-FDMA symbols at a subframe level.
6. A UE configured to transmit control information in a wireless communication system, comprising:
at least one antenna; and
a processor
configured to:
spread a control information block corresponding to one single carrier frequency division multiplexing (SC-FDMA) symbol such that spread control information blocks correspond to a plurality of first SC-FDMA symbols,
DFT-precode the spread control information blocks on an SC-FDMA symbol basis,
generate a plurality of reference signal sequences corresponding to a plurality of second SC-FDMA symbols, wherein each of the plurality of reference signal sequences is generated by circular-shifting a base sequence,
transmit the DFT-precoded control information blocks through the plurality of first SC-FDMA symbols in a subframe through the at least one antenna, and
transmit the plurality of reference signal sequences through the plurality of second SC-FDMA symbols in the subframe through the at least one antenna,
wherein an orthogonal code is applied to the plurality of second SC-FDMA symbols in a time domain.
7. The UE according to claim 6 , wherein the plurality of first SC-FDMA symbols and the plurality of second SC-FDMA symbols are transmitted through multiple antennas, and the orthogonal code applied to the plurality of second SC-FDMA symbols are differently configured for each of the multiple antennas.
8. The UE according to claim 7 , wherein spreading codes used for the spreading the control information block are orthogonal between the multiple antennas.
9. The UE according to claim 6 , wherein the orthogonal code is applied to the plurality of second SC-FDMA symbols at a slot level.
10. The UE according to claim 9 , wherein an orthogonal code is additionally applied to the plurality of second SC-FDMA symbols at a subframe level.