Method of transmitting control signal in wireless communication system
A method of transmitting a control signal in a wireless communication system includes allocating a first sequence to spread a first control signal in a radio resource, allocating a second sequence to spread a second control signal in the radio resource, selecting one of the first control signal and the second control signal, generating a spread control signal by spreading the selected control signal, and transmitting the spread control signal in the radio resource, wherein the first sequence and the second sequence use different cyclic shifts of a base sequence.
1. A method of transmitting a control signal in a wireless communication system, performed by a user equipment, the method comprising:
determining a cyclic shift value for a first control signal in a multiplexed resource block, wherein the cyclic shift value for the first control signal is determined so that the first control signal and a second control signal are identified by different cyclic shift values of a base sequence in the multiplexed resource block;
generating a spread control signal by spreading the first control signal with a cyclic shifted sequence which is obtained by cyclically shifting the base sequence with the cyclic shift value for the first control signal; and
transmitting the spread control signal in the multiplexed resource block,
wherein the multiplexed resource block is defined by a plurality of subcarriers in a frequency domain and a slot in a time domain, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, and
wherein a number of OFDM symbols used for a reference signal of the first control signal in the multiplexed resource block is greater than a number of OFDM symbols used for a reference signal of the second control signal in the multiplexed resource block.
2. The method of claim 1 , wherein the OFDM symbols used for the reference signal of the first control signal in the multiplexed resource block are not overlapped with the OFDM symbols used for the reference signal of the second control signal in the multiplexed resource block.
3. The method of claim 1 , wherein the first control signal is spread with the cyclic shifted sequence in frequency domain.
4. The method of claim 1 , wherein a number of bits for the first control signal is different from a number of bits for the second control signal.
5. The method of claim 1 , wherein the first control signal is a ACK/NACK signal for hybrid automatic repeat request (HARQ) and the second control signal is a channel quality indicator (CQI).
6. The method of claim 1 , wherein the base sequence is a Zadoff-Chu (ZC) sequence.
7. A transmitter comprising a Inverse fast Fourier transform (IFFT) unit for performing IFFT on a frequency domain signal to generated a transmit signal, wherein the frequency domain signal is generated by:
determining a cyclic shift value for a first control signal in a multiplexed resource block, wherein the cyclic shift value for the first control signal is determined so that the first control signal and a second control signal are identified by different cyclic shift values of a base sequence in the multiplexed resource block; and
generating the frequency domain signal by spreading the first control signal with a cyclic shifted sequence which is obtained by cyclically shifting the base sequence with the cyclic shift value for the first control signal,
wherein the multiplexed resource block is defined by a plurality of subcarriers in a frequency domain and a slot in a time domain, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, and
wherein a number of OFDM symbols used for a reference signal of the first control signal in the multiplexed resource block is greater than a number of OFDM symbols used for a reference signal of the second control signal in the multiplexed resource block.
8. The transmitter of claim 7 , wherein the OFDM symbols used for the reference signal of the first control signal in the multiplexed resource block are not overlapped with the OFDM symbols used for the reference signal of the second control signal in the multiplexed resource block.
9. The transmitter of claim 7 , wherein the first control signal is spread with the cyclic shifted sequence in frequency domain.
10. The transmitter of claim 7 , wherein a number of bits for the first control signal is different from a number of bits for the second control signal.
11. The transmitter of claim 7 , wherein the first control signal is a ACK/NACK signal for hybrid automatic repeat request (HARQ) and the second control signal is a channel quality indicator (CQI).
12. The transmitter of claim 7 , wherein the base sequence is a Zadoff-Chu (ZC) sequence.