Barakat, Basel ORCID: https://orcid.org/0000-0001-9126-7613, Keates, Simeon, Wassell, Ian and Arshad, Kamran (2019) Is the Zero-Wait policy always optimum for information freshness (peak age) or throughput? IEEE Communications Letters, 23 (6). pp. 987-990. ISSN 1089-7798 (Print), 1558-2558 (Online) (doi:10.1109/LCOMM.2019.2907935)

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Abstract

The Zero-Wait (ZW) policy is widely held to achieve maximum information ‘freshness’, i.e., to achieve minimum Peak Age (PA) and maximum throughput, for real-time Internet-of-Things applications. In this paper, it was shown through a series of experiments that the ZW policy is not necessarily the optimum policy for freshness nor throughput in all real-world scenarios. Firstly, the effect of delay on the ZW policy was shown on a LAN. Afterwards, the server was located on the Internet, and it was shown that the ZW policy incurred a two-fold PA and throughput performance degradation compared with continuously sending status updates.

Item Type:	Article
Uncontrolled Keywords:	real-time systems, status update, information freshness, peak age of information, zero-wait policy
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG) Faculty of Engineering & Science > Future Technology and the Internet of Things
Last Modified:	31 Jul 2019 12:39
URI:	http://gala.gre.ac.uk/id/eprint/23413

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