Performance of sleep-mode mechanisms under light-traffic conditions

Abstract

Modem standards for wireless telecommunication, such as IEEE 802. 16s (WiMAX"), foresee in several power-saving mechanisms. One of the main mechanisms is sleep-mode operation, which allows the mobile device to switch off the antenna during a negotiated time (it goes to sleep), thus reducing energy consumption. However, 1гаШс that arrives al the base station (BS) incurs an extra delay, because its delivery can only start after the sleep period has ended. The sleep-mode mechanism in WiMAX has provisions to vary the lengths of subsequent sleep periods, which allows to exploit correlation in the arriving traffic. We depart from our earlier analyses and study the mode! of the sleep-mode mechanists specifically under light-traffic conditions. This results in relatively short and simple formulas that give a lot of insight.