Method and apparatus for transmitting control information in wireless communication system
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for transmitting control information through a PUCCH in a wireless communication system and an apparatus for same comprising the steps of: obtaining a plurality of second modulation symbol streams corresponding to a plurality of SC-FDMA (Single Carrier Frequency Division Multiplexing) symbols by diffusing a plurality of first modulation symbol streams to form the first modulation symbol streams corresponding to the SC-FDMA symbols within a first slot; obtaining a plurality of complex symbol streams by performing a DFT (Discrete Fourier Transform) pre-coding process for the plurality of second modulation symbol streams; and transmitting the plurality of complex symbol streams through the PUCCH wherein the plurality of second modulation symbol streams are scrambled in a SC-FDMA symbol level.
1. A method for performing a physical uplink control channel (PUCCH) transmission at a user equipment (UE) in a wireless communication system, the method comprising:
receiving at least one data;
multiplying c i *w i by a first modulation symbol sequence to generate a plurality of second modulation symbol sequences,
wherein the first modulation symbol sequence includes at least one acknowledgement/negative acknowledgement (ACK/NACK) information about the at least one data, c i is an i th scrambling value, w i is an i th element of an orthogonal code, and i is an integer;
circularly shifting each sequence of the plurality of second modulation symbol sequences to generate a plurality of circularly shifted second modulation symbol sequences;
performing a discrete fourier transform (DFT) operation on the plurality of circularly shifted second modulation symbol sequences to obtain a plurality of complex symbol sequences; and
transmitting the plurality of complex symbol sequences through the PUCCH for feedback of the at least one ACK/NACK information,
wherein each complex symbol sequence is mapped on a respective single carrier-frequency division multiplexing (SC-FDMA) symbol of the PUCCH.
2. The method of claim 1 , wherein c i is corresponds to a respective SC-FDMA symbol.
3. The method of claim 2 , wherein each second modulation symbol sequence corresponds to a respective SC-FDMA symbol.
4. The method of claim 2 , wherein c i is obtained using a value of the following expression:
Σ i=0 7 c (8 N symb UL ·n s +8 l+i )·2 i ,
wherein c( ) is a pseudo-random sequence generation function, N symb UL is the number of SC-FDMA symbols in a slot, n s is a slot index, and l denotes an SC-FDMA symbol index.
5. The method of claim 4 , wherein the pseudo-random sequence generation function is initialized using a cell ID.
6. The method of claim 1 , wherein the plurality of complex symbol sequences is transmitted through one of two slots of the PUCCH.
7. A user equipment (UE) configured to perform a physical uplink control channel (PUCCH) transmission in a wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor,
wherein the processor is configured to:
receive at least one data,
multiply c i *w i by a first modulation symbol sequence to generate a plurality of second modulation symbol sequences,
wherein the first modulation symbol sequence includes at least one acknowledgement/negative acknowledgement (ACK/NACK) information about the at least one data, c i is an i th scrambling value, w i is an i th element of an orthogonal code, and i is an integer,
circularly shift each sequence of the plurality of second modulation symbol sequences to generate a plurality of circularly shifted second modulation symbol sequences,
perform a discrete fourier transform (DFT) operation on the plurality of circularly shifted second modulation symbol sequences to obtain a plurality of complex symbol sequences, and
transmit the plurality of complex symbol sequences through the PUCCH for feedback of the at least one ACK/NACK information,
wherein each complex symbol sequence is mapped on a respective single carrier-frequency division multiplexing (SC-FDMA) symbol of the PUCCH.
8. The UE of claim 7 , wherein c i is corresponds to a respective SC-FDMA symbol.
9. The UE of claim 8 , wherein each second modulation symbol sequence corresponds to a respective SC-FDMA symbol.
10. The UE of claim 8 , wherein c i is obtained using a value of the following expression:
Σ i=0 7 c (8 N symb UL ·n s +8 l+i )·2 i ,
wherein c( ) is a pseudo-random sequence generation function, N symb UL is the number of SC-FDMA symbols in a slot, n s is a slot index, and l denotes an SC-FDMA symbol index.
11. The UE of claim 10 , wherein the pseudo-random sequence generation function is initialized using a cell ID.
12. The UE of claim 7 , wherein the plurality of complex symbol sequences is transmitted through one of two slots of the PUCCH.