A Novel Adaptive Energy Saving Mode in Ieee 802.16E System

Minimizing energy consumption is crucial for portable wireless devices because they operate on a limited battery supply. In this paper, an adaptive energy consumption mechanism for the IEEE 802.16e broadband wireless access (BWA) network was proposed. A mobile subscriber station goes to sleep mode after negations with the base station and temporarily wake-up periodically for a short interval to check whether there is downlink traffic to it to decide whether it goes to awake mode or continues to be in the sleep-mode. The sleep interval is increased exponentially if there is no incoming or outgoing packet during that period. Moreover, the initial sleep interval and maximum interval is adaptive according to the traffic condition. We analytically model the sleep-mode scheme and compare the performance of our scheme with that of traditional energy saving mode by simulations. The result shows that our scheme not only reduces the power consumption dramatically, but also decreases the packet response time