Apparatus, system and method of hybrid beamforming training

A product comprising one or more tangible computer-readable non-transitory storage media comprising computer-executable instructions operable to, when executed by at least one processor, enable the at least one processor to cause a first wireless station to:

• during first hybrid beamforming training, simultaneously transmit, via a plurality of Radio Frequency (RF) chains of the first wireless station, a first plurality of spatially multiplexed Synchronization Signals (SS) beamformed in a plurality of wide beam directions, the first plurality of SS multiplexed in both space and frequency using digital baseband beamforming and RF beamforming;
• process a plurality of first feedback messages from a plurality of second wireless stations, respectively, to identify one or more reported wide beam directions of the plurality of wide beam directions;
• during a second hybrid beamforming training, simultaneously transmit, via the plurality of RF chains of the first wireless station, a second plurality of spatially multiplexed SS beamformed in a plurality of narrow beam directions, which correspond to the one or more reported wide beam directions, the second plurality of SS multiplexed in both space and frequency using the digital baseband beamforming and the RF beamforming;
• process a plurality of second feedback messages from the plurality of second wireless stations, respectively, to identify one or more reported narrow beam directions of the plurality of narrow beam directions;
• and
• transmit a Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) transmission to the plurality of second wireless stations according to a MU-MIMO beamforming scheme based on the reported narrow beam directions.

An apparatus comprising a processor and one or more computer-readable non-transitory storage media comprising computer-executable instructions operable to, when executed by the least one processor, enable the at least one processor to cause a first wireless station to:

• during first hybrid beamforming training, simultaneously process, via a plurality of Radio Frequency (RF) chains of the first wireless station, reception of one or more first spatially multiplexed Synchronization Signals (SS) from a second wireless station over a plurality of wide beam directions;
• select a reported wide beam direction of the plurality of wide beam directions, based on the one or more first SS;
• select a wide beam transmit direction based on the one or more first SS;
• transmit to the second wireless station a first feedback message via the wide beam transmit direction to identify the reported wide beam direction;
• during a second hybrid beamforming training, simultaneously process, via the plurality of RF chains of the first wireless station, reception of one or more second spatially multiplexed SS from the second wireless station over a plurality of narrow beam directions, which correspond to the reported wide beam direction;
• select a reported narrow beam direction of the plurality of narrow beam directions, based on the one or more second SS;
• select a narrow beam transmit direction within the wide beam transmit direction based on the one or more second SS;
• and
• transmit to the second wireless station a second feedback message via the narrow beam transmit direction to identify the reported narrow beam direction.

A product comprising one or more tangible computer-readable non-transitory storage media comprising computer-executable instructions operable to, when executed by at least one processor, enable the at least one processor to cause a first wireless station to:

• during first hybrid beamforming training, simultaneously process, via a plurality of Radio Frequency (RF) chains of the first wireless station, reception of one or more first spatially multiplexed Synchronization Signals (SS) from a second wireless station over a plurality of wide beam directions;
• select a reported wide beam direction of the plurality of wide beam directions, based on the one or more first SS;
• select a wide beam transmit direction based on the one or more first SS;
• transmit to the second wireless station a first feedback message via the wide beam transmit direction to identify the reported wide beam direction;
• during a second hybrid beamforming training, simultaneously process, via the plurality of RF chains of the first wireless station, reception of one or more second spatially multiplexed SS from the second wireless station over a plurality of narrow beam directions, which correspond to the reported wide beam direction;
• select a reported narrow beam direction of the plurality of narrow beam directions, based on the one or more second SS;
• select a narrow beam transmit direction within the wide beam transmit direction based on the one or more second SS;
• and
• transmit to the second wireless station a second feedback message via the narrow beam transmit direction to identify the reported narrow beam direction.