The Study Of Energy-saving Algorithm For Wireless MAN In Sleep Mode

WiMAX can be divided into fixed broadband wireless access air interface standard and mobile broadband wireless access air standard based on whether it supports mobility or not. In order to reduce the MS power consumption and the number of access base station interface, IEEE 802.16e proposed the sleep mode and the idle mode. For different types of business, the protocol defines three different sleep patterns, and each mode has its own power parameters.This paper studies the first sleep mode. The protocol IEEE802.16e provides the minimum sleep interval parameter and maximum parameter by double-index-increase algorithm. But in the low-business situation, the response time would be too long, which affects the quality of service. To address this issue, based on double-index-increase and linear-growth algorithm this paper proposes Power-function growth sleep algorithm based on the traditional Poisson distribution. We tested the algorithm with the help of MATLAB. Better performances achieved compared to the double-index-increase algorithm and linear-growth algorithm in the case of low business. Experiments also show the impact various parameters have on performance.We often assume that packet arrival process follows Poisson distribution, but numerous studies and experiments show that the packet arrival process subject to self-similar distribution. Therefore, according to the distribution of self-similarity theory, this paper proposes a double-index-decrease sleep algorithm. Firstly, by theoretical analysis build model, and then use the simulation software OPNET to conduct simulation test at different flow, such as Poisson stream flow and self-similarity flow. Experimental results show that the algorithm using double-index-decrease, at the expense of a certain time delay can save much more energy. At last, papers makes a conclusion formula under different circumstances.