WLC17-6: An Enhanced Energy Saving Mechanism in IEEE 802.16e

In IEEE 802.16e, the energy saving mechanism is an important problem. Excessive listening operations in sleep-mode will waste a lot of energy and shorten the lifetime of a Mobile Subscriber Station (MSS). In this paper, we propose an enhanced energy saving mechanism to overcome this problem. An embedded Markov chain model is adopted to analyze the enhanced energy saving mechanism analytically. Meanwhile, a closed-form expression of the average energy consumption in the sleep-mode for the suggested mechanism is presented. We evaluate and validate the suggested scheme via analytical results and simulation results. Simulation results illustrate that the proposed mechanism can obtain better effects of energy conservation to minimize MSS power usage and to extend the lifetime of MSS effectively while not compromise the performance of Service Data Unit (SDU) response time.