METHOD OF TRANSMITTING CONTROL SIGNALS IN WIRELESS COMMUNICATION SYSTEM

• US 20100067461A1
• Filed: 06/13/2008
• Published: 03/18/2010
• Est. Priority Date: 06/14/2007
• 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
• Granted Patent: US 7,929,415 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04J 11/0026 of multi-user interference
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 27/20 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/22 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/262 Reduction thereof by selection of pilot symbols
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• 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: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network

Abstract

A method of transmitting control signals in a wireless communication system includes multiplexing a first control signal with a second control signal in a slot, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, wherein the first control signal is mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain, the RS is mapped to the plurality of RS OFDM symbols, the second control signal is mapped to at least one of the plurality of RS OFDM symbols, and transmitting the first control signal and the second control signal in the slot.

Claims

1. A method of transmitting control signals in a wireless communication system,

the control signals being contained in a subframe comprising two consecutive slots, each slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, the plurality of data OFDM symbols being used to transmit a first control signal (CQI) and at least one of the plurality of RS OFDM symbols being used to transmit a second control signal, wherein the method comprises:

mapping the first control signal to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain;

mapping the second control signal to at least one of the plurality of RS OFDM symbols; and

simultaneously transmitting the first control signal and the second control signal in the subframe.

2. The method of claim 1, wherein mapping the control signals comprises performing cyclic shifts on the base sequences in the frequency domain.

3. The method of claim 1, wherein the number of information bits for the first control signal is larger than the number of information bits of the second control signal.

4. The method of claim 1, wherein the first control signal is a channel quality indicator (CQI) which represents a downlink channel condition and the second control signal is a positive acknowledgement (ACK) or negative-acknowledgement (NACK) signal for a hybrid automatic repeat request (HARQ).

5. The method of claim 1, wherein the number of data OFDM symbols is larger than the number of RS OFDM symbols.

6. The method of claim 5, wherein the slot comprises five data OFDM symbols and two RS OFDM symbols, and the two RS OFDM symbols are not contiguous with each other.

7. The method of claim 1, wherein the second control signal is mapped to the last RS OFDM symbol in the slot.

8. The method of claim 1, wherein the second control signal is a single modulated symbol.

9. The method of claim 1, wherein the first control signal uses quadrature phase shift keying (QPSK) modulation and the second control signal uses QPSK or binary phase shift keying (BPSK) modulation.

10-13. -13. (canceled)

14. A transmission equipment configured for operating in a wireless communication system and for transmitting control signals, the control signals being contained in a subframe comprising two consecutive slots, each slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, the plurality of data OFDM symbols being used to transmit a first control signal (CQI) and at least one of the plurality of RS OFDM symbols being used to transmit a second control signal, wherein the equipment comprises a transmission processor configured for:

mapping the first control signal to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain;

mapping the second control signal to at least one of the plurality of RS OFDM symbols; and

simultaneously transmitting the first control signal and the second control signal in the subframe.

15. A reception equipment, configured for operating in a wireless communication system and for receiving control signals, the control signal being contained in a subframe comprising two consecutive slots, each slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, the plurality of data OFDM symbols being used to transmit a first control signal (CQI) and at least one of the plurality of RS OFDM symbols being used to transmit a second control signal, wherein the equipment is configured for receiving simultaneously in the subframe:

the first control signal mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain; and

the second control signal mapped to at least one of the plurality of RS OFDM symbols.

16. A wireless communication system wherein control signals are transmitted between a transmission equipment and a reception equipment, the control signals being contained in a subframe comprising two consecutive slots, each slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, the plurality of data OFDM symbols being used to transmit a first control signal (CQI) and at least one of the plurality of RS OFDM symbols being used to transmit a second control signal, wherein the equipments are configured for exchanging simultaneously in the subframe:

the first control signal mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain; and

the second control signal mapped to at least one of the plurality of RS OFDM symbols.