IEEE 802.16e睡眠模式的自适应算法

An Adaptive Algorithm for Sleep Mode Based on IEEE 802.16e

IEEE 802.16e标准中使用了睡眠模式以达到降低移动台的功率消耗和基站接口资源的使用。本文将使用马尔可夫模型对IEEE 802.16e睡眠模式的功率消耗和时延进行分析。通过分析得知在功率消耗和时延之间有一个权衡,其中的关键因素就是初始的睡眠周期。为此提出一个根据传输速率调整初始睡眠周期大小的自适应算法。仿真结果表明与802.16e标准相比自适应算法能节约20%的功率,仅仅损失了一点时延。

In order to minimize the MS power consumption and decrease the occupation of interface resources in BS, the sleep mode is introduced in the standard IEEE 802. 16e. This paper analyses the power consumption and the delay of IEgE 802. 16e sleep mode operation with a theoretical Markov chain model. The analytical results show that there is a tradeoff between the power consumption and the delay, and the key of the tradeoff is the initial sleep window. Then an adaptive algorithm to adjust the initial sleep window dynamically according to the traffic load is presented . Simulation shows that the power of the proposed algorithmcan save 2 0 % compared to the IEEE 802. 16e standard, the price is lust little increase of the delay.