Systems and methods for beamforming feedback in mmWAVE wireless local area networks

1. A method implemented by a wireless transmit/receive unit (WTRU) having multiple antennas, the method comprising:

determining information that is associated with a baseband channel, the information indicating any of: measurement information and channel information; and

transmitting a signal for requesting baseband beam tracking, the signal transmission based on a determination that system performance is degraded in a beamforming transmission and re-estimation of the baseband channel is part of a current link adaptation procedure.

2. The method of claim 1 , wherein the signal for requesting baseband beam tracking includes a training packet including information indicating a beam tracking type to be any of analog beam tracking and digital beam tracking.

3. The method of claim 1 , wherein the signal for requesting baseband beam tracking includes a non-precoded training signal within a beam-formed signal.

4. The method of claim 3 , wherein the non-precoded training signal comprises training sequences.

5. The method of claim 3 , wherein the beam-formed signal includes a use parameter that indicates maintaining a current configuration for the beam-formed signal.

6. The method of claim 3 , wherein the non-precoded training signal comprises a channel estimation field (CEF).

7. The method of claim 6 , wherein the CEF is transmitted after a padding interval of a training packet.

8. The method of claim 3 , wherein the CEF is contained in a setup header of a training packet.

9. A method implemented by a wireless transmit/receive unit (WTRU) having multiple antennas, the method comprising:

determining information that is associated with a baseband channel, the information indicating any of: measurement information and channel information; and

transmitting a signal for requesting baseband beam tracking, the signal transmission based on a determination that detailed baseband channel information was not part of a multiple-in multiple-out (MIMO) setup procedure.

10. The method of claim 9 , wherein transmitting a signal for requesting baseband beam tracking occurs in an instance when analog beams have been identified but information for the baseband channel is still needed.

11. A wireless transmit/receive unit (WTRU) comprising a processor, a transmitter, and a receiver, wherein the processor, the transmitter, and the receiver are configured to:

determine information that is associated with a baseband channel, the information indicating any of: measurement information and channel information; and

transmit a signal for requesting baseband beam tracking, the signal transmission based on a determination that system performance is degraded in a beamforming transmission and re-estimation of the baseband channel is part of a current link adaptation procedure.

12. The WTRU of claim 11 , wherein the signal for requesting baseband beam tracking includes a training packet including information indicating a beam tracking type to be any of analog beam tracking and digital beam tracking.

13. The WTRU of claim 11 , wherein the signal for requesting baseband beam tracking includes a non-precoded training signal within a beam-formed signal.

14. The WTRU of claim 13 , wherein the non-precoded training signal comprises training sequences.

15. The WTRU of claim 13 , wherein the beam-formed signal includes a use parameter that indicates maintaining a current configuration for the beam-formed signal.

16. The WTRU of claim 13 , wherein the non-precoded training signal comprises a channel estimation field (CEF).

17. The WTRU of claim 16 , wherein the CEF is transmitted after a padding interval of a training packet.

18. The WTRU of claim 16 , wherein the CEF is contained in a setup header of a training packet.