Patent ID: 8885530
Filing Date: 2014-11-11
Classification: H04W,Y02D

Abstract:
1. A method comprising: during an announcement traffic indication message (ATIM) window of a beacon interval, transmitting an ATIM frame from a first station to a second station, and receiving at the first station an acknowledgement frame from the second station; during a time period following said ATIM window within said beacon interval, querying at said first station whether or not there is only one data frame to be transmitted to said second station; if there is more than one data frame to be transmitted, transmitting to the second station a data frame including an end of service period (EOSP) field including a first predefined value and repeating said querying; if there is only one data frame to be transmitted, transmitting to the second station the one data frame including the EOSP field including a second predefined value, different from said first value, prior to the end of the beacon interval; receiving at the first station a data frame from the second station including the EOSP field including the second predefined value, prior to the end of the beacon interval; and entering a sleep state at said first station after receiving said data frame from said second station including the EOSP field including the second predefined value, and prior to the end of the beacon interval.