WAP uplink optimization by selection of MIMO antennas spatial states
A method to operate a wireless access point (WAP) that includes identifying multiple stations from uplink statistics of a plurality of uplinks and determining an optimal spatial state of an antenna array for reception of the plurality of uplinks. Channel state information (CSI) is evaluated for each antenna in the antenna array. Determining the optimal spatial state of the antenna array includes using the CSI for each antenna to extrapolate the optimal spatial state of the antenna array for the plurality of uplinks. The method further includes changing a spatial state of the antenna array to the optimal spatial state.
1 . A method, comprising:
sending a trigger frame to a station, the trigger frame indicating a spatial state for one or more spatial streams in a multiple input, multiple output (MIMO) configuration;
establishing an uplink with the station;
identifying uplink statistics related to the uplink with the station;
determining, for the uplink, an updated spatial state for the uplink; and
changing a spatial state for the station to correspond to the updated spatial state.
2 . The method of claim 1 , the trigger frame including time information and frequency information.
3 . The method of claim 2 , the frequency information includes an allocated frequency range.
4 . The method of claim 3 , wherein the allocated frequency range includes a group of subcarriers or a group of tones.
5 . The method of claim 1 , the trigger frame including resource unit information.
6 . The method of claim 1 , the trigger frame including power control information.
7 . The method of claim 1 , the trigger frame indicating a duration.
8 . The method of claim 1 , the trigger frame indicating a type of uplink.
9 . The method of claim 8 , wherein one or both of the spatial state or the updated spatial state are determined based on the type of uplink.
10 . The method of claim 8 , wherein the type of uplink includes Orthogonal Frequency Division Multiple Access (OFDMA) and/or multi-user, multiple input, multiple output (MU-MIMO).
11 . The method of claim 1 , the spatial state being determined in response to a receipt of a request to send (RTS) packet.
12 . The method of claim 11 , further comprising extracting an identifier of the station from a source field of the RTS packet, and wherein the uplink is established with the station using the identifier of the station.
13 . The method of claim 10 , further comprising, responsive to establishing the uplink with the station, transmitting a clear to send (CTS) response to the station.
14 . The method of claim 10 , further comprising, responsive to changing the spatial state for the station to correspond to the updated spatial state, transmitting a clear to send (CTS) response to the station.