title: A Power-Optimized Cooperative MAC Protocol for Lifetime Extension in Wireless Sensor Networks.
abstract: In wireless sensor networks, in order to satisfy the requirement of long working time of energy-limited nodes, we need to design an energy-efficient and lifetime-extended medium access control (MAC) protocol. In this paper, a node cooperation mechanism that one or multiple nodes with higher channel gain and sufficient residual energy help a sender relay its data packets to its recipient is employed to achieve this objective. We first propose a transmission power optimization algorithm to prolong network lifetime by optimizing the transmission powers of the sender and its cooperative nodes to maximize their minimum residual energy after their data packet transmissions. Based on it, we propose a corresponding power-optimized cooperative MAC protocol. A cooperative node contention mechanism is designed to ensure that the sender can effectively select a group of cooperative nodes with the lowest energy consumption and the best channel quality for cooperative transmissions, thus further improving the energy efficiency. Simulation results show that compared to typical MAC protocol with direct transmissions and energy-efficient cooperative MAC protocol, the proposed cooperative MAC protocol can efficiently improve the energy efficiency and extend the network lifetime.
authors.affiliation: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China. liuk@buaa.edu.cn.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, Beijing 100191, China. liuk@buaa.edu.cn.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. liuk@buaa.edu.cn.
authors.forename: Kai
authors.initials: K
authors.lastname: Liu
authors.affiliation: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China. yufish2@163.com.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, Beijing 100191, China. yufish2@163.com.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. yufish2@163.com.
authors.forename: Shan
authors.initials: S
authors.lastname: Wu
authors.affiliation: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China. huangbo_7113@163.com.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, Beijing 100191, China. huangbo_7113@163.com.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. huangbo_7113@163.com.
authors.forename: Bo
authors.initials: B
authors.lastname: Huang
authors.affiliation: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China. liuf@buaa.edu.cn.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, Beijing 100191, China. liuf@buaa.edu.cn.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. liuf@buaa.edu.cn.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: School of Electronics and Information Engineering, Beihang University, Beijing 100191, China. xuzhen@buaa.edu.cn.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, Beijing 100191, China. xuzhen@buaa.edu.cn.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. xuzhen@buaa.edu.cn.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Xu
keywords: cooperative MAC protocol; cooperative node selection; energy efficiency; medium access control (MAC); network lifetime; transmission power optimization; wireless sensor networks