【摘要】 IEEE802.16e的移动站点接收到的数据是随机到达的,在到达率较小时,较小的Tmin(初始睡眠长度)和Tmax(最大睡眠长度)将使移动站点不断被唤醒,使平均侦听次数增大,导致移动站点的能耗过大;在到达率较大时,较大的Tmin、Tmax将使响应时间变长。为改进这种情况,提出了一种新的自适应节能机制,首先对Tmin以及与之对应的Tmax赋值,一个睡眠模式里Tmax持续的个数定义为J;当进入一个睡眠模式时,其实时Tmin定义为R(Tmin),由上一个睡眠模式的Tmax持续个数J决定,从而达到动态调节Tmin、减少平均侦听次数的目的,采用马尔可夫链模型对上述机制进行了分析。仿真结果验证了该节能机制的有效性。更多还原

【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 real-time 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.更多还原