Title:	A NOVEL RESOURCE REUSE ALGORITHM FOR DEVICE TO DEVICE COMMUNICATIONS
Author(s):	Shahriar Shirvani Moghaddam
ISBN:	978-989-8533-72-2
Editors:	Piet Kommers, Tomayess Issa, Pedro Isaías and Ana Hol
Year:	2017
Edition:	Single
Keywords:	Device-to-device, communications, Overlay, Underlay, Outage probability, Throughput
Type:	Full Paper
First Page:	35
Last Page:	42
Language:	English
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Full Contents:	click to dowload
Paper Abstract:	Device to device (D2D) pairs in a D2D communications orthogonally or non-orthogonally reuse radio resources overlaying or underlaying the cellular network. In order to achieve maximum spectral efficiency, it is needed to find new resource allocation scheme. The main goal of this paper is to optimize the reuse of radio primary resources and increase the number of active D2D pairs in a cell. In this regard, firstly, underlay, overlay, and underlay/overlay schemes are introduced. Then, in order to increase the number of D2D users, a new scheme is proposed which reuses orthogonal resources assigned to a D2D pair k times to D2D pairs in a random access manner. It is clear that by increasing the reuse factor, the number of active D2D pairs increases, which results in an increase in the throughput and spectral efficiency, as well as effective radio reuse factor. The main drawback of the proposed random access method is a dramatic increase in the outage probability. In this research, by proposing a non-random resource reuse underlay/overlay scheme based on a non-overlap scenario, while having the benefits of the proposed random access approach, we decrease the outage probability. In addition to proposing the new resource reuse scheme, new formulations for determining the number of active radio resources, the effective resource reuse ratio, the outage probability and total throughput of D2D users have been extracted that are valid in Rayleigh fading channels.
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