Abstract: A method includes generating a first traffic indication map that announces a restricted access window. The method includes transmitting a first beacon, including the first traffic indication map, over a wireless medium and then transmitting a second beacon. The restricted access window begins after the first beacon and ends before the second beacon. The method includes, during the restricted access window, accessing the wireless medium using first channel access parameters; and after the restricted access window but before the second beacon, accessing the wireless medium using second channel access parameters. The first channel access parameters include a first short interframe space and a first slot time. The second channel access parameters include a second short interframe space equal to the first short interframe space and a second slot time. The second slot time and the first slot time are related by an integer multiple that is greater than one.