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Computers 2018, 7(4), 48;

Performance Evaluation of HARQ Schemes for the Internet of Things

Department of Information Engineering, University of Padova, 35131 Padua, Italy
Author to whom correspondence should be addressed.
This paper is an extended version of the conference paper, Centenaro, M.; Ministeri, G.; Vangelista, L. A comparison of energy-efficient HARQ protocols for M2M communication in the finite block-length regime, 2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB), Montreal, QC, Canada, 4–7 October 2015.
Received: 20 August 2018 / Revised: 14 September 2018 / Accepted: 21 September 2018 / Published: 25 September 2018
Full-Text   |   PDF [371 KB, uploaded 25 September 2018]   |  


Hybrid Automatic Repeat reQuest (HARQ) techniques are widely employed in the most important wireless systems, e.g., the Long Term Evolution (LTE) cellular standard, to increase the reliability of the communication. Despite these schemes have been widely studied in literature in the past several years, the recent results obtained by Polyanskiy, Poor, and Verdú on the finite-blocklength regime disclosed new possibilities for the research on HARQ schemes. Indeed, new communications trends, which are usually part of the Internet of Things (IoT) paradigm, are characterized by very short packet sizes and a high reliability requirement and, therefore, they call for efficient HARQ techniques. In many scenarios, the energy efficiency of the communication plays a key role as well. In this paper, we aim at providing a comprehensive performance comparison of various kinds of HARQ schemes in the context of short-packet transmissions with energy constraints. We derive optimal power allocation strategies and we show that a minimum 50% energy saving can be achieved after very few transmission attempts if we enable packet combining at the receiver side. View Full-Text
Keywords: HARQ; energy-efficiency; finite-blocklength regime; M2M; reliable wireless communication; IoT HARQ; energy-efficiency; finite-blocklength regime; M2M; reliable wireless communication; IoT

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Vangelista, L.; Centenaro, M. Performance Evaluation of HARQ Schemes for the Internet of Things. Computers 2018, 7, 48.

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