一种基于反馈调节的无线体域网功率控制算法

摘要

无线体域网中节点功率控制需要根据当前链路状况动态调节,信号强度反映的链路状况和固定的函数模型在人体环境变化下能耗较大.针对上述问题,提出一种反馈调节算法,以合理选择功率等级.采用链路质量均值表征链路状况,用比例、积分、微分算法进行反馈控制.实验结果表明,与传统乘增加减算法和动态姿势推测算法相比,在保证97.6%包接收率的前提下,该算法的节点平均能耗分别减少17.3 mW和13.7 mW,网络生存期平均提高28.7%和23.4%.%The node power control in Wireless Body Area Network(WBAN) needs to be dynamically adjusted according to the current link state.Energy consumption is great under the change of human body environment when it is based on fixed function model and link quality reflected by the Received Signal Strength Indicator(RSSI).To solve this problem,this paper designs a feedback algorithm to select the transmission power level reasonably.It uses a mean value of Link Quality Indicator(LQI) to reflect the link quality and Proportional,Integral,Differential(PID) for feedback control.Experimental results show that,on the premise of gaining 97.6%packet reception rate,and the average energy consumption of the algorithm is reduced by 17.3 mW and 13.7 mW respectively,the average network lifetime is increased by 28.7% and 23.4% as compared with traditional methods like Multiplicative Increase Additive Decrease(MIAD) and Dynamic Postural Position Inference(DPPI).