Method, apparatus and system of spatial division multiple access communication in a wireless local area network
First Claim
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1. A method of performing simultaneous downlink transmission over a wireless medium to a plurality of wireless stations, the method comprising:
- selecting a set of the plurality of wireless stations according to one or more ranking criteria; and
reserving the wireless medium for a duration sufficient for completing the simultaneous downlink transmission to the wireless stations of said set,wherein selecting said set comprises selecting a preliminary subset based on channel state estimation received during a first learning interval, and selecting a main subset based on channel state estimation received during a second learning interval including said first learning interval,wherein said method further comprises performing simultaneous downlink transmission to stations of said main subset after performing simultaneous downlink transmission to stations of said preliminary subset,wherein said main and preliminary subsets are defined by a set of beamforming vectors, associated with the corresponding subset, andwherein a rate of each frame in the subset is changeable during a lifetime of the subset.
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Abstract
Some demonstrative embodiments of the invention include a method, apparatus for concurrently transmitting data to two or more wireless stations.
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Citations
19 Claims
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1. A method of performing simultaneous downlink transmission over a wireless medium to a plurality of wireless stations, the method comprising:
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selecting a set of the plurality of wireless stations according to one or more ranking criteria; and reserving the wireless medium for a duration sufficient for completing the simultaneous downlink transmission to the wireless stations of said set, wherein selecting said set comprises selecting a preliminary subset based on channel state estimation received during a first learning interval, and selecting a main subset based on channel state estimation received during a second learning interval including said first learning interval, wherein said method further comprises performing simultaneous downlink transmission to stations of said main subset after performing simultaneous downlink transmission to stations of said preliminary subset, wherein said main and preliminary subsets are defined by a set of beamforming vectors, associated with the corresponding subset, and wherein a rate of each frame in the subset is changeable during a lifetime of the subset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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10. The method of 7 comprising computing beamforming vectors based on said channel state, and the selected subset.
Specification