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Sensors 2017, 17(4), 697; doi:10.3390/s17040697

Energy Efficiency of D2D Multi-User Cooperation

1,2
,
1
and
1,*
1
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2
Chongqing Key Laboratory of Mobile Communication, Chongqing 400065, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 15 January 2017 / Revised: 18 March 2017 / Accepted: 26 March 2017 / Published: 28 March 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1350 KB, uploaded 28 March 2017]   |  

Abstract

The Device-to-Device (D2D) communication system is an important part of heterogeneous networks. It has great potential to improve spectrum efficiency, throughput and energy efficiency cooperation of multiple D2D users with the advantage of direct communication. When cooperating, D2D users expend extraordinary energy to relay data to other D2D users. Hence, the remaining energy of D2D users determines the life of the system. This paper proposes a cooperation scheme for multiple D2D users who reuse the orthogonal spectrum and are interested in the same data by aiming to solve the energy problem of D2D users. Considering both energy availability and the Signal to Noise Ratio (SNR) of each D2D user, the Kuhn-Munkres algorithm is introduced in the cooperation scheme to solve relay selection problems. Thus, the cooperation issue is transformed into a maximum weighted matching (MWM) problem. In order to enhance energy efficiency without the deterioration of Quality of Service (QoS), the link outage probability is derived according to the Shannon Equation by considering the data rate and delay. The simulation studies the relationships among the number of cooperative users, the length of shared data, the number of data packets and energy efficiency. View Full-Text
Keywords: D2D communication; multiple user cooperation; energy efficiency; outage probability D2D communication; multiple user cooperation; energy efficiency; outage probability
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Zhang, Z.; Wang, L.; Zhang, J. Energy Efficiency of D2D Multi-User Cooperation. Sensors 2017, 17, 697.

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