METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION OF MULTI-CHANNEL IN WIRELESS LOCAL AREA NETWORK SYSTEM

• US 20120026909A1
• Filed: 07/29/2011
• Published: 02/02/2012
• Est. Priority Date: 07/30/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SEOK, Yong Ho
• Granted Patent: US 9,088,393 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/0687 Full feedback
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for reporting channel state information (CSI), performed by a beamformee, in a wireless local area network system using multi-channels is provided. The method includes receiving, from a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame, receiving the NDP frame from the beamformer, estimating a channel from a training symbol of the NDP frame and transmitting to the beamformer a CSI report frame containing a result obtained by estimating the channel, wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, and wherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.

Claims

1. A method for reporting channel state information (CSI), performed by a beamformee, in a wireless local area network system using multi-channels, the method comprising:

receiving, from a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame;

receiving the NDP frame from the beamformer;

estimating a channel from a training symbol of the NDP frame; and

transmitting to the beamformer a CSI report frame containing a result obtained by estimating the channel,

wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, and

wherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.

2. The method of the claim 1, the method further compring:

being assigned an associaton identifier(AID) indentifying the beamformee by the beamformer;

wherein the NDPA frame comprises the AID indicating the beamformee that recieves the NDP frame.

3. The method of the claim 2,

wherein a bandwidth of the first channel is 80 MHz and a bandwidth of the second channel is 80 MHz.

4. The method of the claim 1,

wherein the NDPA frame comprises one or more station information fields indicating a destination staion of the NDP frame,

wherein the NDPA frame is broadcasted if the NDPA frame comprises a plurality of the station information fields, and the NDPA frame is unicasted if the NDPA frame comprises one station information field.

5. The method of the claim 4, the method further compring:

receving a data frame from the beamformer,

wherein the data frame is beamformed by the steering matrix.

6. A method for acquring channel state information (CSI), performed by a beamformer, in a wireless local area network system using multi-channels, the method comprising:

transmitting, to a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame;

transmitting the NDP frame to the beamformer; and

receving to the beamformer a CSI report frame containing a result obtained by estimating the channel,

wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, and

wherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.

7. The method of the claim 6, the method further compring:

assigning the beamformee an associaton identifier(AID) indentifying the beamformee;

wherein the NDPA frame comprises the AID indicating the beamformee that recieves the NDP frame.

8. The method of the claim 7,

wherein a bandwidth of the first channel is 80 MHz and a bandwidth of the second channel is 80 MHz.

9. The method of the claim 6,

wherein the NDPA frame comprises one or more station information fields indicating a destination staion of the NDP frame,

wherein the NDPA frmae is broadcasted if the NDPA frame comprises a plurality of the station information fields, and the NDPA frame is unicasted if the NDPA frame comprises one station information field.

10. The method of the claim 9, the method further compring:

transmitting a data frame to the beamformer by using multi-user multiple input multiple output tranmission technique,

wherein the data frame is beamformed by the steering matrix.

11. An apparatus for reporting channel state information (CSI) in a wireless local area network system using multi-channels, the apparatus comprising a processor configured to:

receive, from a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame;

receivie the NDP frame from the beamformer;

estimate a channel from a training symbol of the NDP frame; and

transmit to the beamformer a CSI report frame containing a result obtained by estimating the channel,

wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, and

wherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.