Analysis and simulation of a novel energy saving mechanism based on IEEE802.16e
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Abstract:
The arrival time of data received by a mobile station in IEEE 802.16e is stochastic. When the arrival rate is low, the shorter initial sleep time (Tmin) and the maximal sleep time (Tmax) will lead to the mobile station being awakened frequently, which increases the average listening times and consumes more energy. On the other hand, when the arrival rate is high, longer Tmin and Tmax lead to longer response times. To address these problems, a novel adaptive energy saving mechanism is proposed. Firstly, Tmin and its corresponding Tmax are initialized. The mumber of Tmax which the mobile station lasted in a sleep mode is denoted as J. The realtime Tmin is defined as R(Tmin) when the mobile station is in a sleep mode. R(Tmin) is determined by J which representd the Tmax of the former sleep mode. As a result, Tmin is adjusted adaptively, and the average listening times are reduced. A Markov chain is adopted to analyze the above adaptive energy saving mechanism. The simulation results demonstrate the effectiveness of the proposed energy saving mechanism.
