An energy-efficient opportunistic relay assignment in wireless cooperative networks

Authors:
Yindong Zhang;Liusheng Huang;Henan Zhao;Hongli Xu
Affiliations:
School of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China/ Suzhou Institute for Advanced Study, University of Science and Technology of China, S ...;School of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China/ Suzhou Institute for Advanced Study, University of Science and Technology of China, S ...;School of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China/ Suzhou Institute for Advanced Study, University of Science and Technology of China, S ...;School of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China/ Suzhou Institute for Advanced Study, University of Science and Technology of China, S ...
Venue:
International Journal of Sensor Networks
Year:
2013

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Abstract

It is very important to assign proper relays to transmission pairs so as to explore the efficiency of cooperative communication CC. Most of the previous protocols were designed for ideal circumstances, where the Packet Drop Loss Ratio PDLR on each communication link is 0. Moreover, in hazardous surroundings, channel state is unstable, which is ignored by many algorithms. In this paper, we investigate an Opportunistic Relay Assignment Problem ORAP in a wireless cooperative network where channel state is unstable. We take into consideration the PFLR, while still guaranteeing energy-efficiency. We prove that this problem ORAP is NP-hard. A distributed algorithm, called DORAA, is proposed to solve this problem. We analyse the approximate performance ratio of DORAA. Our numerical results show that DORAA can reduce expected transmission time by 15.44% and save energy by 19.45% on average.