Energy-Efficient Relay Selection for Cooperative Relaying in Wireless Multimedia Networks

• Published in: IEEE transactions on vehicular technology Vol. 64; no. 3; pp. 1156 - 1170
• Main Authors: Zhengguo Sheng, Jun Fan, Liu, Chi Harold, Leung, Victor C. M., Xue Liu, Leung, Kin K.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.03.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Diversity reception; Energy conservation; Fading; Gain; Multimedia; Multimedia communication; Networks; Power consumption; Power demand; Quality of service; Relay; Relaying; Relays; Simulation; Wireless communication; Wireless networks; multimedia; Energy efficiency; quality-of-service (QoS); relaying; reliability
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2014.2322653

In existing wireless networks, supporting multimedia services are becoming more popular and important. In general, wireless multimedia networks should require energy efficiency and reliable transmission while keeping satisfactory quality of services. In this respect, cooperative communications have been considered as an efficient approach to address these demands by offering significant diversity gains over single-antenna systems without increasing requirements on radio resources. In this paper, we propose a power-allocation method to optimize the decode-and-forward (DF) cooperative transmission for source and relay nodes as a means to reduce the total power consumption, while maintaining the required quality of services, and investigate fundamental characteristics of cooperative transmission in terms of power efficiency. Moreover, for a network with multiple cooperative nodes, we also propose an energy-efficient relay selection rule to offer fairness at each node and implement it into a practical routing protocol. Our performance analysis is supplemented by simulation results to illustrate significant energy savings of the proposed methods.