METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20130022017A1
• Filed: 04/04/2011
• Published: 01/24/2013
• Est. Priority Date: 01/17/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Seung Hee, Chung, Jae Hoon, Lee, Moon II, Kwon, Yeong Hyeon, Moon, Sung Ho
• Granted Patent: US 8,855,076 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/2697 in combination with other modulation techniques
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

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.

Claims

1. A method for, at a user equipment (UE), transmitting control information through a physical uplink control channel (PUCCH) in a wireless communication system, the method comprising:

spreading a first modulated symbol sequence such that the first modulated symbol sequence corresponds a plurality of single carrier-frequency division multiplexing (SC-FDMA) symbols in a first slot, to obtain a plurality of second modulated symbol sequences corresponding to the plurality of SC-FDMA symbols;

performing a discrete Fourier transform (DFT) precoding on the plurality of second modulated symbol sequences to obtain a plurality of complex symbol sequences; and

transmitting the plurality of complex symbol sequences through the PUCCH,

wherein scrambling is applied to the plurality of second modulated symbol sequences at SC-FDMA symbol level.

2. The method of claim 1, wherein the scrambling at SC-FDMA symbol level is performed using a product of an orthogonal code and a scrambling code for the spreading.

3. The method of claim 1, wherein the scrambling at SC-FDMA symbol level is performed using [wi*c], wherein wi is a value of an i-th element of an orthogonal code for the spreading and c is a scrambling value for a corresponding SC-FDMA symbol.

4. The method of claim 1, wherein a value for the scrambling is obtained using the following equation:

n_cs^cell(n_s,l)=Σ

_i=0⁷c(8N_symb^UL·

n_s+8l+i)·

2ⁱ

, wherein n_cs^cell(n_s,l) is a cell-specific cyclic shift value, 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. A UE configured to transmit control information through a PUCCH in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to spread a first modulated symbol sequence such that the first modulated symbol sequence corresponds a plurality of SC-FDMA symbols in a first slot, to obtain a plurality of second modulated symbol sequences corresponding to the plurality of SC-FDMA symbols, to perform a DFT precoding on the plurality of second modulated symbol sequences to obtain a plurality of complex symbol sequences, and to transmit the plurality of complex symbol sequences through the PUCCH,

wherein scrambling is applied to the plurality of second modulated symbol sequences at SC-FDMA symbol level.

7. The UE of claim 6, wherein the scrambling at SC-FDMA symbol level is performed using a product of an orthogonal code and a scrambling code for the spreading.

8. The UE of claim 6, wherein the scrambling at SC-FDMA symbol level is performed using [wi*c], wherein wi is a value of an i-th element of an orthogonal code for the spreading and c is a scrambling value for a corresponding SC-FDMA symbol.

9. The UE of claim 6, wherein a value for the scrambling is obtained using the following equation:

n_cs^cell(n_s,l)=Σ

_i=0⁷c(8N_symb^UL·

n_s+8l+i)·

2ⁱ

, wherein n_cs^cell(n_s,l) is a cell-specific cyclic shift value, 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 is an SC-FDMA symbol index.

10. The UE of claim 9, wherein the pseudo-random sequence generation function is initialized using a cell ID.