Method of transmitting control signal in wireless communication system

• US 7,852,959 B2
• Filed: 05/30/2008
• Issued: 12/14/2010
• Est. Priority Date: 05/30/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Dong Cheol, Kwak, Jin Sam, Noh, Min Seok, Han, Seung Hee, Kwon, Yeong Hyeon, Lee, Hyun Woo
• Primary Examiner(s): PHU, PHUONG M
• Application Number:
  US12/602,320
• Publication Number:
  US 20100177804A1
• Time in Patent Office: 928 Days
• Field of Search: 375/260, 375/132, 375/133, 375/135, 375/140, 375/141, 375/146, 370/320, 370/319, 370/335, 370/344
• US Class Current: 375/260
• CPC Class Codes: H04J 13/0059 CAZAC [constant-amplitude and zero auto-correlation]
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04L 1/1692 Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

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.

Claims

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.