On the Impact of HARQ on the Throughput and Energy Efficiency Using Cross-Layer Analysis

Burich, M. E., Souza, R. D., Brante, G., Onireti, O. and Imran, M. A. (2017) On the Impact of HARQ on the Throughput and Energy Efficiency Using Cross-Layer Analysis. In: Wireless Days 2017, Porto, Portugal, 29-31 Mar 2017, pp. 146-151. ISBN 9781509058563 (doi: 10.1109/WD.2017.7918131)

Abstract

This paper studies the potential improvements in terms of energy efficiency and system throughput of a hybrid automatic retransmission request (HARQ) mechanism. The analysis includes both the physical (PHY) and medium access (MAC) layers. We investigate the trade-off provided by HARQ, which demands reduced transmit power for a given target outage probability at the cost of more accesses to the channel. Since the competition for channel access at the MAC layer is very expensive in terms of energy and delay, our results show that HARQ leads to great performance improvements due to the decrease in the number of contending nodes – a consequence of the reduced required transmit power. Counter-intuitively, our analysis leads to the conclusion that retransmissions may decrease the delay, improving the system performance. Finally, we investigate the optimum values for the number of allowed retransmissions in order to maximize either the throughput or the energy efficiency.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Imran, Professor Muhammad and Onireti, Oluwakayode
• Authors: Burich, M. E., Souza, R. D., Brante, G., Onireti, O., and Imran, M. A.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• ISBN: 9781509058563
• Copyright Holders: Copyright © 2017 IEEE
• First Published: First published in Wireless Days 2017:146-151
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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