Patent ID: 9204371
Filing Date: 2015-12-01
Classification: H04W

Abstract:
1. An access point comprising: a restricted access window module configured to define a restricted access window during which stations that belong to a same infrastructure basic service set as the access point are not allowed to transmit data frames; a beacon creation module configured to generate a beacon announcing the restricted access window, wherein the restricted access window is contained within a following beacon interval; a transmitter module configured to transmit the beacon to the stations that belong to the same infrastructure basic service set as the access point, wherein the following beacon interval begins upon transmission of the beacon and ends upon transmission of a second beacon, wherein the transmitter module is configured to transmit the second beacon subsequent to the beacon without transmitting any intervening beacons; a downlink tracking module configured to, during the restricted access window, receive a poll frame from a first station of the stations that belong to the same infrastructure basic service set as the access point; and a data transmission module configured to, subsequent to the poll frame, transmit a data frame to the first station, wherein the beacon includes a delivery traffic indication map and includes an indication that the data frame is queued for transmission to the first station, wherein during the restricted access window, the stations that belong to the same infrastructure basic service set as the access point are permitted to transmit frames having a first value of a transmission characteristic, and wherein during a second restricted access window, the stations that belong to the same infrastructure basic service set as the access point are permitted to transmit frames having a second value of the transmission characteristic.