Energy Efficiency Optimization in Relay-Assisted Networks with Energy Harvesting Relay Constraints  

作　　者：ZHAO Ming ZHAO Jing ZHOU Wuyang ZHU Jinkang ZHANG Sihai 

机构地区：[1]Key Laboratory of Wireless-Optical Communications,Chinese Academy of Sciences,University of Science and Technology of China

出　　处：《China Communications》2015年第2期84-94,共11页中国通信（英文版）

基　　金：supported by National programs for High Technology Research and Development(2012AA011402);National Basic Research Program of China(2012CB316002);National Nature Science Foundation of China(61172088)

摘　　要：In this paper we consider data transmission in a decode-and-forward(DF)relay-assisted network in which the relay is energy harvesting(EH) powered while the base station(BS) is power-grid powered.Our purpose is to maximize the BS's energy efficiency(EE) while making full use of the relay's renewable energy and satisfying the specific average throughput requirements.In contrast to existing literature on energy harvesting system which only considers the radio transmission power,we take the static circuit power into account as well.We formulate the EE optimization problem and prove that the EE of the BS and relay are both quasiconvex in the instantaneous transmission rate.Then we divide the complex optimization problem into two point-to-point link level optimization parts and propose an energyefficient resource allocation(EERA) scheme in which power control and sleep mode management are jointly used.The simulation results demonstrate that EERA may achieve good energy saving effects.We also compare the EE of an energy harvesting relay system with a power-grid powered one and provide more insight into the EE problem of energy harvesting relay system.In this paper we consider data transmission in a decode-and-forward（DF）relay-assisted network in which the relay is energy harvesting（EH） powered while the base station（BS） is power-grid powered.Our purpose is to maximize the BS＇s energy efficiency（EE） while making full use of the relay＇s renewable energy and satisfying the specific average throughput requirements.In contrast to existing literature on energy harvesting system which only considers the radio transmission power,we take the static circuit power into account as well.We formulate the EE optimization problem and prove that the EE of the BS and relay are both quasiconvex in the instantaneous transmission rate.Then we divide the complex optimization problem into two point-to-point link level optimization parts and propose an energyefficient resource allocation（EERA） scheme in which power control and sleep mode management are jointly used.The simulation results demonstrate that EERA may achieve good energy saving effects.We also compare the EE of an energy harvesting relay system with a power-grid powered one and provide more insight into the EE problem of energy harvesting relay system.

关 键 词：energy efficiency energy harvesting relay sleep mode 

分 类 号：TM58[电气工程—电器]