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Channel Coding Versus Cooperative ARQ: Reducing Outage Probability in Ultra-Low Latency Wireless Communications
KTH, School of Electrical Engineering (EES), Communication Theory.
2015 (English)In: 2015 IEEE GLOBECOM WORKSHOPS (GC WKSHPS), 2015Conference paper (Refereed)
Abstract [en]

Nowadays wireless communications still lack the ability to provide high reliability and low latency, although mission-critical applications, such as found in industrial automation, rely on both requirements. The main challenge is that an improved reliability often comes at the price of an increased latency. It has been shown that cooperative schemes can effectively increase the reliability by leveraging spatial diversity. However, an important question remains how to integrate cooperative schemes when dealing with very short latency bounds and especially how much time should be reserved for potential retransmissions. In this work, we propose and evaluate a centralized communication system that uses cooperative ARQ to achieve high reliability under the constraint of a strict latency bound of 1 ms. We evaluate this system analytically, using an outage-capacity model with average channel state information, by varying the reserved time for retransmissions, where a shorter time for retransmissions allows to apply stronger channel codes in the original transmission. As a baseline, we use a system without cooperation mechanism, thus applying the given time for stronger channel codes in the direct transmission of a message. In case of cooperation, a third station may act as a relay if the original transmission failed. Our results reveal that an optimal size of the reserved retransmission time exists around 15% to 30% of the total frame time, increasing the reliability by several orders of magnitude, even for a large number of transmissions within a communication cycle.

Place, publisher, year, edition, pages
2015.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-192051DOI: 10.1109/GLOCOMW.2015.7414150ISI: 000380457400193ScopusID: 2-s2.0-84971268681ISBN: 978-1-4673-9526-7OAI: oai:DiVA.org:kth-192051DiVA: diva2:963035
Conference
IEEE Globecom Workshops (GC Wkshps), DEC 06-10, 2015, San Diego, CA
Note

QC 20160907

Available from: 2016-09-07 Created: 2016-09-05 Last updated: 2016-09-07Bibliographically approved

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Gross, James
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