METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CHANNEL STATUS INFORMATION (CSI) FOR SUPPORTING 256QAM IN WIRELESS ACCESS SYSTEM

• US 20140169300A1
• Filed: 12/19/2013
• Published: 06/19/2014
• Est. Priority Date: 12/19/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Bonghoe, SEO, Dongyoun, YI, Yunjung, AHN, Joonkui
• Granted Patent: US 9,432,168 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0005 applied to payload information
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 25/03898 codebook-based design selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A method and apparatus for transmitting and receiving channel status information (CSI) for supporting 256QAM in a wireless access system are disclosed. A method for transmitting a Channel Quality Indication (CQI) index for 256QAM (Quadrature Amplitude Modulation) in a wireless access system includes: receiving, by a user equipment (UE), a message including a 256QAM indicator indicating use of a 256QAM scheme; performing channel measurement of a downlink channel through which downlink data is transmitted; and transmitting a CQI index in response to the channel measurement result to a base station (BS), wherein the UE simultaneously manages a first CQI feedback table for supporting a legacy modulation scheme and a second CQI feedback table for supporting the 256QAM scheme.

Claims

1. A method for transmitting a Channel Quality Indication (CQI) index for 256QAM (Quadrature Amplitude Modulation) in a wireless access system, comprising:

receiving, by a user equipment (UE), a message including a 256QAM indicator indicating use of a 256QAM scheme;

performing channel measurement of a downlink channel through which downlink (DL) data is transmitted; and

transmitting a CQI index in response to the channel measurement result to a base station (BS),

wherein the UE simultaneously manages a first CQI feedback table for supporting a legacy modulation scheme and a second CQI feedback table for supporting the 256QAM scheme.

2. The method according to claim 1, wherein:

if the 256QAM scheme is used, the CQI index is always selected from the second CQI feedback table,

wherein the CQI index is transmitted through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

3. The method according to claim 1, wherein:

if the CQI index is selected from the first CQI feedback table, the CQI index is always transmitted through a physical uplink control channel (PUCCH), and

if the CQI index is selected from the second CQI feedback table, the CQI index is always transmitted through a physical uplink shared channel (PUSCH).

4. The method according to claim 3, wherein the transmission of the CQI index includes:

transmitting, by the user equipment (UE), a CQI table identifier (ID) indicating which CQI feedback table is used

5. The method according to claim 1, wherein the first CQI feedback table is 4 bits long, and the second CQI feedback table is 5 bits long.

6. A method for receiving a Channel Quality Indication (CQI) index for 256QAM (Quadrature Amplitude Modulation) in a wireless access system, comprising:

transmitting, by a base station (BS), a message including a 256QAM indicator indicating use of a 256QAM scheme;

receiving a CQI index; and

transmitting downlink (DL) data which is modulated in consideration of the CQI index,

wherein the BS simultaneously manages a first CQI feedback table for supporting a legacy modulation scheme and a second CQI feedback table for supporting the 256QAM scheme.

7. The method according to claim 6, wherein:

if the 256QAM scheme is used, the CQI index is always associated with the second CQI feedback table,

wherein the CQI index is received through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

8. The method according to claim 6, wherein:

if the CQI index is associated with the first CQI feedback table, the CQI index is always received through a physical uplink control channel (PUCCH), and

if the CQI index is associated with the second CQI feedback table, the CQI index is always received through a physical uplink shared channel (PUSCH).

9. The method according to claim 8, wherein the reception of the CQI index includes:

receiving, by the base station (BS), a CQI table identifier (ID) indicating which CQI feedback table is used.

10. The method according to claim 6, wherein the first CQI feedback table is 4 bits long, and the second CQI feedback table is 5 bits long.

11. A user equipment (UE) for transmitting a Channel Quality Indication (CQI) index for 256QAM (Quadrature Amplitude Modulation) in a wireless access system, comprising:

a transmitter;

a receiver; and

a processor configured to support the 256QAM scheme,

wherein the processor controls the receiver to receive a message including a 256QAM indicator indicating use of the 256QAM scheme, performs channel measurement of a downlink channel through which downlink (DL) data is transmitted, and controls the transmitter to transmit a CQI index in response to the channel measurement result to a base station (BS),

wherein the processor simultaneously manages a first CQI feedback table for supporting a legacy modulation scheme and a second CQI feedback table for supporting the 256QAM scheme.

12. The user equipment (UE) according to claim 11, wherein:

if the 256QAM scheme is used, the CQI index is always selected from the second CQI feedback table,

wherein the CQI index is transmitted through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

13. The user equipment (UE) according to claim 11, wherein:

if the CQI index is selected from the first CQI feedback table, the CQI index is always transmitted through a physical uplink control channel (PUCCH), and

if the CQI index is selected from the second CQI feedback table, the CQI index is always transmitted through a physical uplink shared channel (PUSCH).

14. The user equipment (UE) according to claim 13, wherein the processor is configured to transmit the CQI index and a CQI table identifier (ID) indicating which CQI feedback table is used.

15. The user equipment (UE) according to claim 11, wherein the first CQI feedback table is 4 bits long, and the second CQI feedback table is 5 bits long.

16. A base station (BS) for receiving a Channel Quality Indication (CQI) index for 256QAM (Quadrature Amplitude Modulation) in a wireless access system, comprising:

a transmitter;

a receiver; and

a processor configured to support the 256QAM scheme,

wherein the processor controls the transmitter to transmit a message including a 256QAM indicator indicating use of a 256QAM scheme, controls the receiver to receive a CQI index, and controls the transmitter to transmit downlink (DL) data which is modulated in consideration of the CQI index,

wherein the processor simultaneously manages a first CQI feedback table for supporting a legacy modulation scheme and a second CQI feedback table for supporting the 256QAM scheme.

17. The base station (BS) according to claim 16, wherein:

if the 256QAM scheme is used, the CQI index is always associated with the second CQI feedback table,

wherein the CQI index is received through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

18. The base station (BS) according to claim 16, wherein:

if the CQI index is associated with the first CQI feedback table, the CQI index is always received through a physical uplink control channel (PUCCH), and

if the CQI index is associated with the second CQI feedback table, the CQI index is always received through a physical uplink shared channel (PUSCH).

19. The base station (BS) according to claim 18, wherein the processor is configured to receive the CQI index and a CQI table identifier (ID) indicating which CQI feedback table is used.

20. The base station (BS) according to claim 16, wherein the first CQI feedback table is 4 bits long, and the second CQI feedback table is 5 bits long.