Method and system for communicating feedback information in a multiple user multiple input multiple output (MU-MIMO) communication system

• US 8,738,085 B2
• Filed: 04/01/2013
• Issued: 05/27/2014
• Est. Priority Date: 12/30/2009
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kim, Joonsuk, Ariyavisitakul, Sirikiat Lek
• Primary Examiner(s): WASHINGTON, ERIKA ALISE
• Application Number:
  US13/854,342
• Publication Number:
  US 20130294533A1
• Time in Patent Office: 421 Days
• Field of Search: None
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

A method and system for communicating feedback information in a multiple user multiple input multiple output (MU-MIMO) communication system are presented. In one aspect of the method and system, a beamformer station may communicate a feedback information request to a plurality of beamformee stations. The feedback information request may request feedback data for a plurality of RF channel bands. The RF channel bands may form a multichannel. The beamformer may subsequently transmit a plurality of signals utilizing the RF channel bands within the multichannel. Each of the beamformees may receive the plurality of subsequently transmitted signals. A beamformee may generate the requested feedback data for each RF channel band within the multichannel. The beamformee may generate a beamforming report, which comprises the feedback data, which is generated across the plurality of RF channel bands in the multichannel. The beamformee may transmit the beamforming report to the beamformer.

Claims

1. A wireless communication device comprising:

a communication interface configured to;

transmit a sounding frame that includes a feedback information request to a plurality of other wireless communication devices;

receive first and second compressed beamforming report frames respectively from a first one and a second one of the plurality of wireless communication devices that are based on the feedback information request; and

transmit a multi-user multiple-input-multiple-output (MU-MIMO) frame to the first one and the second one of the plurality of wireless communication devices; and

a processor configured to;

generate a beamforming matrix based on the first and second compressed beamforming report frames; and

generate the MU-MIMO frame based on the beamforming matrix.

2. The wireless communication device of claim 1 further comprising:

the communication interface configured to receive the first and the second compressed beamforming report frames sequentially from the first one and the second one of the plurality of wireless communication devices.

3. The wireless communication device of claim 1 further comprising:

the communication interface includes a first antenna configured to transmit a first frame to the first one of the plurality of wireless communication devices; and

the communication interface includes a second antenna configured to transmit a second frame to the second one of the plurality of wireless communication devices.

4. The wireless communication device of claim 1, wherein at least one of the first and the second compressed beamforming report frames includes a multiband control field that includes a first index to indicate a number of columns of a beamforming matrix in the at least one of the first and the second compressed beamforming report frames, a second index to indicate a number of rows of the beamforming matrix in the at least one of the first and the second compressed beamforming report frames, and a multiple-input-multiple-output (MIMO) channel bandwidth field that indicates a bandwidth of a reported channel band.

5. The wireless communication device of claim 4, wherein the MIMO channel bandwidth field is a 3 bit field that indicates at least one of 20 mega-Hertz (MHz) channel bandwidth, a 40 MHz channel bandwidth, 80 MHz channel bandwidth, and a 120 MHz channel bandwidth.

6. The wireless communication device of claim 1, wherein at least one of the first and the second compressed beamforming report frames includes a multiband control field that includes a grouping field that indicates a number of transmit data stream groups that corresponds to a number of wireless communication devices within the plurality of wireless communication devices.

7. The wireless communication device of claim 1, wherein at least one of the first and the second compressed beamforming report frames includes a multiband control field that includes a field to indicate a number of quantization bits used to generate angle feedback information within the first and the second compressed beamforming report frames.

8. The wireless communication device of claim 1 further comprising:

an access point (AP), and wherein the plurality of wireless communication devices includes a plurality of wireless stations (STAs).

9. A wireless communication device comprising:

a communication interface configured to;

transmit a sounding frame that includes a feedback information request to a plurality of other wireless communication devices;

receive a first compressed beamforming report frame from a first one of the plurality of wireless communication devices that is based on the feedback information request, wherein the first compressed beamforming report frame includes a first multiband control field that includes a first multiple-input-multiple-output (MIMO) channel bandwidth field that indicates a first bandwidth of 20 mega-Hertz (MHz), 40 MHz, 80 MHz, or 120 MHz of a first reported channel band; and

receive a second compressed beamforming report frame from a second one of the plurality of wireless communication devices that is based on the feedback information request, wherein the second compressed beamforming report frame includes a second multiband control field that includes a second MIMO channel bandwidth field that indicates a second bandwidth of 20 MHz, 40 MHz, 80 MHz, or 120 MHz of a second reported channel band; and

a processor configured to;

generate a beamforming matrix based on the first and second compressed beamforming report frames; and

generate a multi-user multiple-input-multiple-output (MU-MIMO) frame based on the beamforming matrix.

10. The wireless communication device of claim 9 further comprising:

the communication interface configured to receive the first and the second compressed beamforming report frames sequentially from the first one and the second one of the plurality of wireless communication devices.

11. The wireless communication device of claim 9, wherein at least one of the first and the second MIMO channel bandwidth field is a 3 bit field that indicates at least one of 20 mega-Hertz (MHz) channel bandwidth, a 40 MHz channel bandwidth, 80 MHz channel bandwidth, and a 120 MHz channel bandwidth.

12. The wireless communication device of claim 9, wherein at least one of the first and the second compressed beamforming report frames includes a multiband control field that includes a grouping field that indicates a number of transmit data stream groups that corresponds to a number of wireless communication devices within the plurality of wireless communication devices and that includes a field to indicate a number of quantization bits used to generate angle feedback information within the first and the second compressed beamforming report frames.

13. The wireless communication device of claim 10 further comprising:

an access point (AP), and wherein the plurality of wireless communication devices includes a plurality of wireless stations (STAs).

14. A method for execution by a wireless communication device, the method comprising:

transmitting a sounding frame that includes a feedback information request to a plurality of other wireless communication devices;

receiving a first compressed beamforming report frame from a first one of the plurality of wireless communication devices, wherein the first compressed beamforming report frame is based on the feedback information request;

receiving a second compressed beamforming report frame from a second one of the plurality of wireless communication devices, wherein the second compressed beamforming report frame is based on the feedback information request;

generating a beamforming matrix based on the first and second compressed beamforming report frames;

generating a multi-user multiple-input-multiple-output (MU-MIMO) frame based on the beamforming matrix; and

transmitting the MU-MIMO frame to the first one and the second one of the plurality of wireless communication devices.

15. The method of claim 14 further comprising:

firstly receiving the first compressed beamforming report frame from the first one of the plurality of wireless communication devices; and

secondly receiving the second compressed beamforming report frame from the second one of the plurality of wireless communication devices.

16. The method of claim 14 further comprising:

transmitting a first frame to the first one of the plurality of wireless communication devices using a first antenna of the wireless communication device; and

transmitting a second frame to the second one of the plurality of wireless communication devices using a second antenna of the wireless communication device.

17. The method of claim 14, wherein at least one of the first and the second compressed beamforming report frames includes a multiband control field that includes a first index to indicate a number of columns of a beamforming matrix in the at least one of the first and the second compressed beamforming report frames, a second index to indicate a number of rows of the beamforming matrix in the at least one of the first and the second compressed beamforming report frames, and a multiple-input-multiple-output (MIMO) channel bandwidth field that indicates a bandwidth of a reported channel band.

18. The method of claim 17, wherein the MIMO channel bandwidth field is a 3 bit field that indicates at least one of 20 mega-Hertz (MHz) channel bandwidth, a 40 MHz channel bandwidth, 80 MHz channel bandwidth, and a 120 MHz channel bandwidth.

19. The method of claim 14, wherein at least one of the first and the second compressed beamforming report frames includes a multiband control field that includes a field to indicate a number of quantization bits used to generate angle feedback information within the first and the second compressed beamforming report frames.

20. The method of claim 14, wherein the wireless communication device is an access point (AP), and the plurality of wireless communication devices includes a plurality of wireless stations (STAs).