Power Allocation for Energy Harvesting in Wireless Body Area Networks

• Published in: China communications 2017-06, Vol.14 (6), p.22-31
• Main Authors: Liu, Xiaolan, Hu, Fengye, Meiqi Shao, Dan Sui, He, Gengxin
• Format: Article
• Language: English
• Subjects: Body area networks; Energy harvesting; Fading channels; Optimization; outage probability; reliability; Resource management; Sensors; wireless body area networks (WBANs); Wireless communication; 中断概率; 优化问题; 功率分配; 区域网; 拉格朗日乘子法; 无线; 瑞利衰落信道; 能量收集
• ISSN: 1673-5447
• DOI: 10.1109/CC.2017.7961360

Wireless Body Area Networks（WBANs） are expected to achieve high reliable communications among a large number of sensors.The outage probability can be used to measure the reliability of the WBAN.In this paper,we optimize the outage probability with the harvested energy as constraints.Firstly,the optimal transmit power of the sensor is obtained while considering a single link between an access point（AP） located on the waist and a sensor attached on the wrist over the Rayleigh fading channel.Secondly,an optimization problem is formed to minimize the outage probability.Finally,we convert the non-convex optimization problem into convex solved by the Lagrange multiplier method.Simulations show that the optimization problem is solvable.The outage probability is optimized by performing power allocation at the sensor.And our proposed algorithm achieves minimizing the outage probability when the sensor uses energy harvesting.We also demonstrate that the average outage probability is reduced with the increase of the harvested energy.