METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM

• US 20090059844A1
• Filed: 06/25/2008
• Published: 03/05/2009
• Est. Priority Date: 06/25/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Ihm, Bin Chul, Lee, Moon Il, Chung, Jae Hoon, Lee, Wook Bong
• Granted Patent: US 8,000,258 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/0413 MIMO systems
• 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 7/0656 at the transmitter, e.g. error detection at base station
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04B 7/0871 using different reception schemes, at least one of them being a diversity reception scheme
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0035 evaluation of received explicit signalling
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating preceding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined preceding scheme.

Claims

1. A method of transmitting data in a wireless communication system, the method comprising:

receiving feedback data on an uplink data channel, the feedback data comprising a preceding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook;

transmitting a preceding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating preceding according to the received PMI and a new PMI indicating that it is used in preceding downlink data to be transmitted; and

transmitting the downlink data on a downlink data channel after applying precoding according to the determined preceding scheme.

2. The method of claim 1, wherein the precoding scheme is determined as the transmit diversity when error in the feedback data is detected by using cyclic redundancy check (CRC) attached to the feedback data.

3. The method of claim 1, wherein the preceding scheme is determined as the new PMI indicating that it is used in precoding according to the latest received PMI.

4. The method of claim 1, wherein the transmit diversity includes a space frequency block code (SFBC) and a cyclic delay diversity (CDD).

5. The method of claim 1, wherein the feedback data comprise a plurality of PMIs, each of the plurality of PMIs being selected from the codebook for each subband.

6. The method of claim 1, wherein the feedback data comprise a frequency flat PMI on a plurality of subbands and a frequency selective PMI on selected subbands of the plurality of subbands.

7. A method of processing data in a wireless communication system, the method comprising:

configuring feedback data comprising at least one PMI, wherein the value of a PMI corresponds to an index in a codebook;

reporting the feedback data on an uplink data channel;

receiving a preceding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as a transmit diversity irrespective of the reported PMI or a preceding matrix which is used to precode the downlink data; and

receiving the downlink data on a downlink data channel.

8. The method of claim 7, wherein the feedback data comprise a plurality of PMIs on a plurality of subbands and one wholeband CQI on the plurality of subbands.

9. The method of claim 7, wherein the feedback data comprise a first PMI on a plurality of subbands, a second PMI on selected subbands of the plurality of subband, one wholeband CQI on the plurality of subbands and one CQI on the selected subbands of the plurality of subbands.