CLAIMS
What is claimed is:
1. An apparatus comprising logic and circuitry configured to cause a first
wireless station to:
perform a Transmit Sector Sweep (TXSS) protocol with a second wireless station over a directional frequency band using a plurality of antennas of the first wireless station, an antenna of the plurality of antennas of the first wireless station comprising a plurality of sectors;
perform a Receive Sector Sweep (RXSS) protocol with the second wireless station over the directional frequency band using the plurality of antennas of the first wireless station; and
based on the TXSS and RXSS protocols, configure the plurality of antennas of the first wireless station to communicate a Single-User (SU) Multiple-Input-Multiple-Output (MIMO) transmission with the second wireless station.
2. The apparatus of claim 1, wherein the TXSS protocol comprises a TXSS initiator sector sweep (ISS) phase of an initiator station, and a TXSS responder sector sweep (RSS) phase of a responder station, and wherein the RXSS protocol comprises an RXSS ISS phase of the initiator station and an RXSS RSS phase of the responder station.
3. The apparatus of claim 2 configured to cause the first wireless station to operate as the initiator station.
4. The apparatus of claim 3 configured to cause the first wireless station to, during the TXSS ISS phase, perform a sequence of a plurality of TXSS via the plurality of antennas of the first wireless station, respectively; and to repeat the sequence of the plurality of TXSS based on a number of antennas of the responder station.
5. The apparatus of claim 3 configured to cause the first wireless station to, during the TXSS RSS phase, operate the plurality of antennas of the first wireless station at an omni-receive mode to receive a plurality of responder Sector Sweep (SSW) frames from the responder station.

6. The apparatus of claim 5 configured to cause the first wireless station to determine, based on the responder SSW frames, a plurality of responder transmit sectors of a plurality of antennas of the responder station, and, subsequent to the TXSS RSS phase, to transmit to the responder station a feedback frame comprising an indication of the plurality of responder transmit sectors.
7. The apparatus of claim 6, wherein the plurality of responder transmit sectors correspond to a respective plurality of different combinations of one of the plurality of antennas of the first wireless station and one of the plurality of antennas of the responder station.
8. The apparatus of claim 3 configured to cause the first wireless station to, during the RXSS ISS phase, sequentially transmit a plurality of initiator Sector Sweep (SSW) transmission sequences via respective antennas of the plurality of antennas of the first wireless station, an initiator SSW transmission sequence via the antenna of the first wireless station comprises transmitting a plurality of initiator SSW frames via a first selected initiator transmit sector of the antenna, and repeating transmission of the initiator SSW frames via at least a second selected initiator transmit sector of the antenna based on a number of antennas of the responder station.
9. The apparatus of claim 3 configured to cause the first wireless station to, during the RXSS RSS phase, sequentially perform a plurality of RXSS via respective antennas of the plurality of antennas of the first wireless station, and repeat the plurality of RXSS based on a number of antennas of the responder station.
10. The apparatus of claim 2 configured to cause the first wireless station to operate as the responder station.
11. The apparatus of claim 10 configured to cause the first wireless station to, during the TXSS ISS phase, operate the plurality of antennas of the first wireless station at an omni-receive mode to receive a plurality of initiator Sector Sweep (SSW) frames from the initiator station.
12. The apparatus of claim 11 configured to cause the first wireless station to determine, based on the initiator SSW frames, a plurality of initiator transmit sectors of a plurality of antennas of the initiator station, and, during the TXSS RSS phase, to

transmit to the initiator station a plurality of responder SSW frames comprising an indication of the plurality of initiator transmit sectors.
13. The apparatus of claim 12, wherein the plurality of initiator transmit sectors correspond to a respective plurality of different combinations of one of the plurality of antennas of the first wireless station and one of a plurality of antennas of the initiator station.
14. The apparatus of claim 10 configured to cause the first wireless station to, during the TXSS RSS phase, perform a sequence of a plurality of TXSS via the plurality of antennas of the first wireless station, respectively; and to repeat the sequence of TXSS based on a number of antennas of the initiator station.
15. The apparatus of claim 14, wherein a TXSS via the antenna of said plurality of antennas of the first wireless station comprises transmitting a plurality of responder Sector Sweep (SSW) frames via respective sectors of the antenna.
16. The apparatus of claim 15, wherein a responder SSW frame transmitted from an antenna of the responder station to an antenna of the initiator station comprises an indication of an initiator transmit sector of the antenna of the initiator station to transmit to the antenna of the responder station.
17. The apparatus of claim 10 configured to cause the first wireless station to, during the RXSS ISS phase, sequentially perform a plurality of RXSS via respective antennas of the plurality of antennas of the first wireless station, and repeat the plurality of RXSS based on a number of antennas of the initiator station.
18. The apparatus of claim 10 configured to cause the first wireless station to, during the RXSS RSS phase, sequentially transmit a plurality of responder Sector Sweep (SSW) transmission sequences via respective antennas of the plurality of antennas of the first wireless station, a responder SSW transmission sequence via the antenna of the first wireless station comprises transmitting a plurality of responder SSW frames via a first selected responder transmit sector of the antenna, and repeating transmission of the responder SSW frames via at least a second selected responder transmit sector of the antenna based on a number of antennas of the initiator station.

19. The apparatus of any one of claims 1-18 comprising a radio, a memory and a
processor.
20. A method to be performed at a first wireless station, the method comprising:
performing a Transmit Sector Sweep (TXSS) protocol with a second wireless
station over a directional frequency band using a plurality of antennas of the first wireless station, an antenna of the plurality of antennas of the first wireless station comprising a plurality of sectors;
performing a Receive Sector Sweep (RXSS) protocol with the second wireless station over the directional frequency band using the plurality of antennas of the first wireless station; and
based on the TXSS and RXSS protocols, configuring the plurality of antennas of the first wireless station to communicate a Single-User (SU) Multiple-Input-Multiple-Output (MIMO) transmission with the second wireless station.
21. The method of claim 20, wherein the TXSS protocol comprises a TXSS initiator sector sweep (ISS) phase of an initiator station, and a TXSS responder sector sweep (RSS) phase of a responder station, and wherein the RXSS protocol comprises an RXSS ISS phase of the initiator station and an RXSS RSS phase of the responder station.
22. The method of claim 21 comprising operating the first wireless station as the initiator station.
23. The method of claim 22 comprising, during the RXSS ISS phase, sequentially transmitting a plurality of initiator Sector Sweep (SSW) transmission sequences via respective antennas of the plurality of antennas of the first wireless station, an initiator SSW transmission sequence via the antenna of the first wireless station comprises transmitting a plurality of initiator SSW frames via a first selected initiator transmit sector of the antenna, and repeating transmission of the initiator SSW frames via at least a second selected initiator transmit sector of the antenna based on a number of antennas of the responder station.
24. The method of claim 21 comprising operating the first wireless station as the responder station.

25. A product including one or more tangible computer-readable non-transitory
storage media comprising computer-executable instructions operable to, when executed by at least one computer processor, enable the at least one computer processor to perform the method of any one of claims 20-24.