Exploratory beamforming training techniques for 60 GHz devices

1. An apparatus, comprising:

a station (STA) comprising logic, at least a portion of which is in hardware, the logic to:

identify an exploratory link quality associated with an exploratory beamforming configuration for a directionally-beamformed wireless link,

determine whether to revert to a previous beamforming configuration for the directionally-beamformed wireless link by comparing a link quality associated with the previous beamforming configuration to the exploratory link quality associated with the exploratory beamforming configuration,

in response to a determination to revert to the previous beamforming configuration, send a frame comprising a rollback notification for the directionally-beamformed wireless link,

receive a second frame comprising an acknowledgment of the rollback notification for the directionally-beamformed wireless link; and

revert to a previous beamforming configuration for a second directionally-beamformed wireless link in response to a determination that the second frame comprises a rollback notification for the second directionally-beamformed wireless link.

2. The apparatus of claim 1 , the logic to initiate an exploratory beamforming training procedure, the exploratory beamforming training procedure to comprise generating the exploratory beamforming configuration for the directionally-beamformed wireless link.

3. The apparatus of claim 2 , the logic to initiate the exploratory beamforming training procedure by sending a sector sweep frame.

4. The apparatus of claim 2 , the logic to initiate the exploratory beamforming training procedure by sending a grant frame.

5. The apparatus of claim 4 , the grant frame to comprise a beamforming control field containing a bit set to a value to indicate exploratory beamforming.

6. The apparatus of claim 1 , comprising:

at least one radio frequency (RF) transceiver; and

at least one RF antenna.

7. An apparatus, comprising:

a station (STA) comprising logic, at least a portion of which is in hardware, the logic to

revert from an exploratory beamforming configuration for a directionally-beamformed wireless link to a previous beamforming configuration for the directionally-beamformed wireless link in response to receipt of a first frame comprising a rollback notification for the directionally-beamformed wireless link,

send a second frame comprising an acknowledgment of the rollback notification,

communicate over the directionally-beamformed wireless link according to the previous beamforming configuration, the first frame to comprise a sector sweep feedback frame, and the second frame to comprise a sector sweep acknowledgement frame,

determine whether to revert to a previous beamforming configuration for a second directionally-beamformed wireless link based on an exploratory link quality associated with an exploratory beamforming configuration for the second directionally-beamformed wireless link;

include a rollback notification for the second directionally-beamformed wireless link in the second frame in response to a determination to revert to the previous beamforming configuration for the second directionally-beamformed wireless link.

8. The apparatus of claim 7 , the first frame to comprise a rollback notification for a second directionally-beamformed wireless link, the second frame to comprise an acknowledgment of the rollback notification for the second directionally-beamformed wireless link.

9. The apparatus of claim 7 , the second frame to comprise a directional multi-gigabit (DMG) link acknowledgment element comprising a beamforming rollback activity value set to acknowledge the rollback notification for the directionally-beamformed wireless link.

10. At least one non-transitory computer-readable medium comprising a set of instructions that, in response to being executed at a station (STA), cause the STA to:

identify an exploratory link quality associated with an exploratory beamforming configuration for a directionally-beamformed wireless link;

determine whether to revert to a previous beamforming configuration for the directionally-beamformed wireless link by comparing a link quality associated with the previous beamforming configuration to the exploratory link quality associated with the exploratory beamforming configuration; and

in response to a determination to revert to the previous beamforming configuration, send a frame comprising a rollback notification for the directionally-beamformed wireless link; wherein the frame comprises a sector sweep feedback frame, the rollback notification to comprise a rollback bit in a Sector Sweep (SSW) Feedback field of the sector sweep feedback frame.

11. The at least one non-transitory computer-readable medium of claim 10 , comprising instructions that, in response to being executed at the STA, cause the STA to initiate an exploratory beamforming training procedure, the exploratory beamforming training procedure to comprise generating the exploratory beamforming configuration for the directionally-beamformed wireless link.

12. The at least one non-transitory computer-readable medium of claim 10 , the frame to comprise a beam refinement frame, the rollback notification to comprise a rollback bit in a Directional Multi-Gigabit (DMG) Beam Refinement element of the beam refinement frame.

13. The at least one non-transitory computer-readable medium of claim 10 , the frame to comprise a link measurement response frame, the rollback notification to comprise a beamforming rollback activity value in an Activity field of a Directional Multi-Gigabit (DMG) Link Margin element of the link measurement response frame.

14. The at least one non-transitory computer-readable medium of claim 10 , comprising instructions that, in response to being executed at the STA, cause the STA to:

receive a second frame comprising an acknowledgment of the rollback notification for the directionally-beamformed wireless link; and

revert to a previous beamforming configuration for a second directionally-beamformed wireless link in response to a determination that the second frame comprises a rollback notification for the second directionally-beamformed wireless link.

15. The at least one non-transitory computer-readable medium of claim 10 , comprising instructions that, in response to being executed at the STA, cause the STA to include a rollback notification for a second directionally-beamformed wireless link in the sent frame in response to a determination to revert to a previous beamforming configuration for the second directionally-beamformed wireless link.