Real-Time Status Updates with Perfect Feedback over Erasure Channels

Bobbili, SC and Parag, P and Chamberland, JF (2020) Real-Time Status Updates with Perfect Feedback over Erasure Channels. In: IEEE Transactions on Communications, 68 (9). pp. 5363-5374.

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Abstract

Real-time decision making relies on the availability of accurate data and, therefore, delivering status updates in a timely fashion is of paramount importance. The topic of real-time status updates has received much attention in recent years. This article contributes new results to this research area by studying the interplay between average timeliness and design decisions made at the physical layer, for unreliable communication channels. Specifically, this study explores the tension between the fact that more reliable transmissions with lower probabilities of decoding failure tend to improve timely delivery, unless these improvements come at the expense of significantly longer codewords. The average timeliness is adopted as an evaluation criterion, and a framework to efficiently compute the performance of various transmission schemes for the binary erasure channel is developed. We show that the average timeliness decreases as we increase the feedback rate in a hybrid ARQ scheme for a range of codeword lengths. This article also provides design guidelines for the codeword length selection for an hybrid ARQ scheme to improve the average information timeliness. Numerical examples are included to further illustrate the applicability of our findings. © 1972-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Communications
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	copyright for this artilce belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Decision making; Error correction, Average information; Binary erasure channel; Evaluation criteria; Lower probabilities; Real time decision-making; Reliable transmission; Transmission schemes; Unreliable communication channels, Design
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	18 Nov 2020 09:27
Last Modified:	18 Nov 2020 09:27
URI:	http://eprints.iisc.ac.in/id/eprint/66914

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