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Open AccessArticle

A Throughput and Energy Efficiency Scheme for Unlicensed Massive Machine Type Communications

by 1,*,‡, 1,‡, 2,‡ and 1,‡
1
Centre for Wireless Communications, University of Oulu, 90570 Oulu, Finland
2
School of Energy Systems, LUT University, 53850 Lappeenranta, Finland
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Ramezanipour, I., Nardelli, P. H., Alves, H., and Pouttu, A. Increasing the throughput of an unlicensed wireless network through retransmissions. In Proceedings of the 2018 IEEE 87th Vehicular Technology Conference (VTC Spring), Porto, Portugal, 3–6 June 2018. pp. 1–5.
These authors contributed equally to this work.
Sensors 2020, 20(8), 2357; https://doi.org/10.3390/s20082357
Received: 19 February 2020 / Revised: 29 March 2020 / Accepted: 18 April 2020 / Published: 21 April 2020
(This article belongs to the Section Communications)
In this paper, the throughput and energy efficiency of an unlicensed machine type communications network is studied. If an outage event happens in the network, there is a possibility for packet retransmission in order to obtain a lower error probability. The concept of spectrum sharing is used here for modeling the network, which allows the two types of licensed and unlicensed users to share the same uplink channel allocated to the licensed users. However, it is done in a way that no harm is done to the licensed nodes’ transmission for sharing the same channel with the unlicensed users, while licensed nodes’ transmission causes interference on the unlicensed network. Poisson point process is used here to model the location of the nodes and the effect of interference on the network. We study how different factors such as the number of retransmissions, SIR threshold and outage can affect the throughput and energy efficiency of the network. Throughput and energy efficiency are also both studied in constrained optimization problems where the constraints are the SIR threshold and the number of retransmission attempts. We also show why it is important to use limited transmissions and what are the benefits. View Full-Text
Keywords: energy efficiency; massive machine type communications; poisson point process; spectrum sharing; unlicensed spectrum access energy efficiency; massive machine type communications; poisson point process; spectrum sharing; unlicensed spectrum access
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MDPI and ACS Style

Ramezanipour, I.; Alves, H.; J. Nardelli, P.H.; Pouttu, A. A Throughput and Energy Efficiency Scheme for Unlicensed Massive Machine Type Communications . Sensors 2020, 20, 2357. https://doi.org/10.3390/s20082357

AMA Style

Ramezanipour I, Alves H, J. Nardelli PH, Pouttu A. A Throughput and Energy Efficiency Scheme for Unlicensed Massive Machine Type Communications . Sensors. 2020; 20(8):2357. https://doi.org/10.3390/s20082357

Chicago/Turabian Style

Ramezanipour, Iran; Alves, Hirley; J. Nardelli, Pedro H.; Pouttu, Ari. 2020. "A Throughput and Energy Efficiency Scheme for Unlicensed Massive Machine Type Communications " Sensors 20, no. 8: 2357. https://doi.org/10.3390/s20082357

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