METHOD OF TRANSMITTING FEEDBACK DATA IN A MULTIPLE ANTENNA SYSTEM

• US 20120201165A1
• Filed: 04/20/2012
• Published: 08/09/2012
• Est. Priority Date: 08/10/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KO, Hyun Soo, IHM, Bin Chul, CHUN, Jin Young, LEE, Moon Il, LEE, Wook Bong
• Granted Patent: US 8,804,542 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0621 Feedback content
• CPC Class Codes: H04B 7/0623 Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0658 Feedback reduction
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• 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
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI

Abstract

A method of transmitting feedback data in a multiple antenna system comprises receiving a request message of feedback data on a downlink channel, the request message comprising uplink scheduling information, selecting a set of M (M≧1) subbands within a plurality of subbands, generating the feedback data, the feedback data comprising a frequency selective PMI (precoding matrix indicator), a frequency flat PMI, a best band CQI (channel quality indicator) and a whole band CQI, and transmitting the feedback data on a uplink channel allocated to the uplink scheduling information.

Claims

1. A transmitter for transmitting feedback data in a multiple antenna system, the transmitter comprising:

a processor configured to;

receive a request message of feedback data on a downlink channel, the request message comprising uplink scheduling information;

select a set of M subbands within a plurality of subbands, wherein M is greater than or equal to 1;

generate the feedback data, the feedback data comprising a frequency selective precoding matrix indicator (PMI), a frequency flat PMI, a best band channel quality indicator (CQI) and a whole band CQI, the frequency selective PMI indicating an index of a precoding matrix selected from a codebook over the M selected subbands, the frequency flat PMI indicating an index of a precoding matrix selected from the codebook over the plurality of subbands, the best band CQI indicating a CQI value over the M selected subbands, the whole band CQI indicating a CQI value over the plurality of subbands; and

transmit the feedback data on an uplink channel allocated to the uplink scheduling information.

2. The transmitter of claim 1, wherein the feedback data further comprises a rank indicator (RI), the RI corresponding to the number of useful transmission layers, and the best band CQI and the whole band CQI are calculated for each transmission layer.

3. The transmitter of claim 1, wherein the feedback data further comprises a resource indicator which represents positions of the M selected subbands.

4. The transmitter of claim 1, wherein the downlink channel is a physical downlink control channel (PDCCH).

5. The transmitter of claim 1, wherein the uplink channel is a physical uplink shared channel (PUSCH).

6. The transmitter of claim 1, wherein the best band CQI has a differential CQI value with respect to the whole band CQI.

7. The transmitter of claim 1, wherein the uplink scheduling information comprises an indicator indicating transmission of the feedback data and uplink radio resource assignment.

8. The transmitter of claim 1, wherein the set of M subbands is selected within the plurality of subbands according to a CQI for each subband.

9. The transmitter of claim 1, wherein the frequency flat PMI indicates the index of a precoding matrix selected from the codebook for all of the plurality of subbands.