Patent ID: 9100154
Filing Date: 2015-08-04
Classification: H04B,H04L,H04W

Abstract:
1. An access point comprising: a plurality of antennas; a plurality of radio circuitries configured to transmit and receive signals via the plurality of antennas; and a baseband processor configured to monitor the signals received by the radio circuitries and generate a list of neighboring co-channel access points, each neighboring co-channel access point having a plurality of antennas and each being located within a clear channel assessment (CCA) range of the access point, wherein the baseband processor is further configured to instruct the radio circuitries to transmit a sounding sequence to the list of neighboring co-channel access points, and receive Channel State Information (CSI), wherein the baseband processor is further configured to set weights on the radio circuitries to produce a null at one or more antennas of the listed neighboring co-channel access point which currently transmits on a same frequency channel and downloads of a packet to a station (STA), or a group of STAs, wherein null weights are determined via an explicit sounding process invoked between the access point and each of the listed neighboring co-channel access points, based on a null data packet (NDP) announcement by a nulling AP and response by a nulled AP, wherein the access point sounding set (APSS) NDP announcement and NDP comprise an access point sounding set ID field replacing an STA ID field in a MU MIMO protocol.