CONCURRENT MIMO BEAMFORMING TRAINING IN mmW WLAN SYSTEMS

• US 20190123798A1
• Filed: 03/08/2017
• Published: 04/25/2019
• Est. Priority Date: 03/10/2016
• Status: Active Application

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Lou, Hanqing, Oteri, Oghenekome, Sahin, Alphan
• Application Number:
  US16/083,170
• Publication Number:
  US 20190123798A1
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/0897 using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Systems, methods, and instrumentalities are disclosed for concurrent multiple input multiple output (MIMO) beamforming training. A first station (STA) may send a training announcement frame to a second STA. The training announcement frame may indicate a training period and/or a concurrent transmit and receive training. The first STA may send a first set of training frames via a first set of transmit beams and a second set of training frames via a second set of transmit beams to the second STA. The second STA may send feedback, associated with the first and second transmit beams, to the first STA. The first STA may perform a down selection training, for example, when the feedback includes a down selection request. The down selection training may be performed during the down selection training period. The down-selected set of transmit beams may be determined based on the received feedback.

Claims

1. A first station (STA) comprising:

a processor configured to;

send, to a second STA, a training announcement frame that indicates a training period and a concurrent transmit and receive training;

send, to the second STA during a training transmit opportunity (TXOP), a first set of training frames via a first set of transmit beams in a first time slot of the training period, wherein each of the training frames comprises a header, a MAC body, and one or more training fields;

send, to the second STA during the training TXOP, a second set of training frames via a second set of transmit beams in a second time slot of the training period;

receive, from the second STA during the training TXOP, feedback associated with one or more transmit beams of the first and second set of transmit beams, wherein the feedback includes one or more of channel state information (CSI) or one or more beam identifications (IDs); and

perform a down selection training during the training TXOP, wherein the down selection training comprises sending a set of down selection training frames via a down-selected set of transmit beams, and wherein the down-selected set of transmit beams are a subset of the first set and second set of transmit beams and are determined based on the received feedback.

2. The first STA of claim 1, wherein the processor is further configured to:

send one or more acknowledgment (ACK) frames, to the second STA, in response to the received feedback; and

send a down selection indication to the second STA, wherein the down selection indication indicates a need to perform down selection.

3. The first STA of claim 2, wherein the down selection indication is included in an ACK frame of the one or more ACK frames.

4. The first STA of claim 2, wherein the down selection indication is a multiple input multiple output (MIMO) beamforming request indication.

5. The first STA of claim 1, wherein the processor is further configured to send the first and second set of training frames to one or more other STAs.

6. The first STA of claim 1, wherein the down-selected set of transmit beams are determined based on one or more of beam combinations used in the training period or the one or more beam IDs indicated in the received feedback.

7. The first STA of claim 1, wherein the first set of training frames and the second set of training frames each comprise one respective training frame.

8. The first STA of claim 1, wherein the first STA is an access point (AP) STA.

9. The first STA of claim 1, wherein the feedback is received during a feedback period that follows the training period.

10. The first STA of claim 1, wherein the one or more beam IDs are associated with one or more best beams selected by the second STA.

11. The first STA of claim 1, wherein one or more of the training frames are sent multiple times.

12. A method performed by a first station (STA), the method comprising:

sending, to a second STA, a training announcement frame that indicates a training period and a concurrent transmit and receive training;

sending, to the second STA during a training transmit opportunity (TXOP), a first set of training frames via a first set of transmit beams in a first time slot in the training period, wherein each of the training frames comprises a header, a MAC body, and one or more training fields;

sending, to the second STA during the training TXOP, a second set of training frames via a second set of receive beams in a second time slot in the training period;

receiving, from the second STA during the training TXOP, feedback associated with one or more transmit beams of the first and second set of transmit beams, wherein the feedback includes one or more of channel state information (CSI) or one or more of beam identifications (IDs);

send, to the second STA during the training TXOP, a feedback frame that includes the feedback;

and

performing a down selection training during the training TXOP, wherein the down selection training comprises sending a set of down selection training frames via a down-selected set of transmit beams, wherein the down-selected set of transmit beams are a subset of the first set and second set of transmit beams and are determined based on the received feedback.

21. The method of claim 12, further comprising:

sending one or more acknowledgment (ACK) frames, to the second STA, in response to the received feedback; and

sending a down selection indication to the second STA, wherein the down selection indication indicates a need to perform down selection.

22. The method of claim 21, wherein the down selection indication is included in an ACK frame of the one or more ACK frames.

23. The method of claim 21, wherein the down selection indication is a multiple input multiple output (MIMO) beamforming request indication.

24. The method of claim 12, further comprising:

sending the first and second set of training frames to one or more other STAs.

25. The method of claim 12, wherein the down-selected set of transmit beams are determined based on one or more of beam combinations used in the training period or the one or more beam IDs indicated in the received feedback.

26. The method of claim 12, wherein the first STA is an access point (AP) STA.

27. The method of claim 12, wherein the feedback is received during a feedback period that follows the training period.

28. The method of claim 12, wherein the one or more beam IDs are associated with one or more best beams selected by the second STA.

13-20. -20. (canceled)