A method is provided for a device in a wireless communication network including a base station. The method includes sending a sleep mode request to the base station; and receiving a sleep mode response including negotiating parameters from the base station. The method also includes entering a sleep mode determined by a single power saving class applicable to all traffic conditions between the device and the base station; and communicating with the base station based on the sleep mode. Further, the single power saving class is used to define a frame structure for configuring frames to form alternating listening windows and sleep windows, to define an initial sleep window, and to define a default listening window.