Beamforming feedback format

Patent metadata

Field	Value
Publication number	US-9876542-B2
Application number	US-201514718537-A
Country	US
Kind code	B2
Filing date	May 21, 2015
Priority date	Nov 3, 2010
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

Certain aspects of the present disclosure propose transmitting a feedback message to an access point. The feedback may comprise a beamforming extension field, which may carry per tone signal to noise ratio of a station. For certain aspects, the station transmitting the per-tone SNR may be a single user (SU)-capable device. For certain aspects, the station may indicate to the access point whether or not it has a maximum likelihood (ML) receiver.

First claim

The invention claimed is:

1. An apparatus for wireless communications, comprising:
at least one receiver;
a circuit configured to generate a message comprising at least one bit indicating performance of the at least one receiver would deteriorate when beamformed to; and
a transmitter configured to transmit the message to a device, wherein after transmitting the message, the at least one receiver is configured to receive a non-beamformed signal from the device.

2. The apparatus of claim 1 , wherein the at least one bit comprises a capability bit.

3. The apparatus of claim 1 , wherein the at least one bit comprises a bit of a multiple-input multiple-output (MIMO) control field.

4. The apparatus of claim 1 , wherein the at least one bit causes the device receiving the message to refrain from beamforming when transmitting to the apparatus.

5. The apparatus of claim 1 , wherein the at least one receiver comprises a maximum-likelihood (ML) receiver.

6. The apparatus of claim 1 , wherein the circuit is configured to generate the message comprising the at least one bit to prevent the device from using beamforming when transmitting to the apparatus.

7. An apparatus for wireless communications, comprising:
a receiver configured to receive a message, from a device, comprising at least one bit indicating the device comprises at least one receiver, the performance of which deteriorates when beamformed to; and
a circuit configured to refrain from beamforming when transmitting to the device in response to detecting the at least one bit.

8. The apparatus of claim 7 , wherein the at least one bit comprises a capability bit.

9. The apparatus of claim 7 , wherein the at least one bit comprises a bit of a multiple-input multiple-output (MIMO) control field.

10. The apparatus of claim 7 , wherein the apparatus is configured to transmit to the device using beamforming prior to receiving the message.

11. A method for wireless communications by an apparatus, comprising:
generating a message comprising at least one bit indicating performance of at least one receiver of the apparatus would deteriorate when beamformed to;
transmitting the message to a device; and
after transmitting the message, receiving a non-beamformed signal from the device.

12. The method of claim 11 , wherein the at least one bit comprises a capability bit.

13. The method of claim 11 , wherein the at least one bit comprises a bit of a multiple-input multiple-output (MIMO) control field.

14. The method of claim 11 , wherein the at least one bit causes the device receiving the message to refrain from beamforming when transmitting to the apparatus.

15. The method of claim 11 , wherein the at least one receiver comprises a maximum-likelihood (ML) receiver.

16. The method of claim 11 , wherein the message comprising the at least one bit is generated to prevent the device from using beamforming when transmitting to the apparatus.

17. A method for wireless communications, comprising:
receiving a message, from a device, comprising at least one bit indicating the device comprises at least one receiver, the performance of which deteriorates when beamformed to; and
refraining from beamforming when transmitting to the device in response to detecting the at least one bit.

18. The method of claim 17 , wherein the at least one bit comprises a capability bit.

19. The method of claim 17 , wherein the at least one bit comprises a bit of a multiple-input multiple-output (MIMO) control field.

20. The method of claim 17 , further comprising transmitting to the device using beamforming prior to receiving the message.

21. An apparatus for wireless communications, comprising:
means for generating a message comprising at least one bit indicating performance of at least one receiver of the apparatus would deteriorate when beamformed to;
means for transmitting the message to a device; and
means for, after transmitting the message, receiving a non-beamformed signal from the device.

22. The apparatus of claim 21 , wherein the at least one bit comprises a capability bit.

23. The apparatus of claim 21 , wherein the at least one bit comprises a bit of a multiple-input multiple-output (MIMO) control field.

24. The apparatus of claim 21 , wherein the at least one bit causes the device receiving the message to refrain from beamforming when transmitting to the apparatus.

25. The apparatus of claim 21 , wherein the at least one receiver comprises a maximum-likelihood (ML) receiver.

26. The apparatus of claim 21 , wherein the message comprising the at least one bit is generated to prevent the device from using beamforming when transmitting to the apparatus.

27. An apparatus for wireless communications, comprising:
means for receiving a message, from a device, comprising at least one bit indicating the device comprises at least one receiver, the performance of which deteriorates when beamformed to; and
means for refraining from beamforming when transmitting to the device in response to detecting the at least one bit.

28. The apparatus of claim 27 , wherein the at least one bit comprises a capability bit.

29. The apparatus of claim 27 , wherein the at least one bit comprises a bit of a multiple-input multiple-output (MIMO) control field.

30. The apparatus of claim 27 , further comprising means for transmitting to the device using beamforming prior to receiving the message.

31. A non-transitory computer-readable medium comprising instructions executable to:
generate, by an apparatus, a message comprising at least one bit indicating performance of at least one receiver of the apparatus would deteriorate when beamformed to;
transmit, by the apparatus, the message to a device; and
after transmitting the message, receive, by the apparatus, a non-beamformed signal from the device.

32. A non-transitory computer-readable medium comprising instructions executable to:
receive, by an apparatus, a message, from a device, comprising at least one bit indicating the device comprises at least one receiver, the performance of which deteriorates when beamformed to; and
refrain, by the apparatus, from beamforming when transmitting to the device in response to detecting the at least one bit.

33. An access terminal, comprising:
at least one antenna;
at least one receiver;
a circuit configured to generate a message comprising at least one bit indicating performance of the at least one receiver would deteriorate when beamformed to; and
a transmitter configured to transmit, via the at least one antenna, the message to a device, wherein after transmitting the message, the at least one receiver is configured to receive a non-beamformed signal from the device.

34. An access point, comprising:
at least one antenna;
a receiver configured to receive a message, via the at least one antenna from a device, comprising at least one bit indicating the device comprises at least one receiver, the performance of which deteriorates when beamformed to; and
a circuit configured to refrain from beamforming when transmitting to the device in response to detecting the at least one bit.

Assignees

• Qualcomm Inc
• Qualcomm Inc

Inventors

• Sampath Hemanth
• Vermani Sameer
• Van Zelst Albert
• Van Nee Didier Johannes Richard

Classifications

• H04B7/0689

  using different transmission schemes, at least one of them being a diversity transmission scheme · CPC title

• H04B7/0643 Primary

  Feedback on request · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H04B7/0617

  for beam forming · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title