Is the Zero-Wait Policy Always Optimum for Information Freshness (Peak Age) or Throughput?

Barakat, Basel; Keates, Simeon; Wassell, Ian; Arshad, Kamran

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. Afterward, the server was located on the Internet, and it was shown that the ZW policy incurred a twofold PA and throughput performance degradation compared with continuously sending status updates.

Citation

Barakat, B., Keates, S., Wassell, I., & Arshad, K. (2019). Is the Zero-Wait Policy Always Optimum for Information Freshness (Peak Age) or Throughput?. IEEE Communications Letters, 23(6), 987-990. https://doi.org/10.1109/LCOMM.2019.2907935

• Journal Article Type: Article
• Acceptance Date: Mar 6, 2019
• Online Publication Date: Apr 11, 2019
• Publication Date: 2019-06
• Deposit Date: Mar 27, 2019
• Publicly Available Date: Apr 11, 2019
• Journal: IEEE Communications Letters
• Print ISSN: 1089-7798
• Electronic ISSN: 1558-2558
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 23
• Issue: 6
• Pages: 987-990
• DOI: https://doi.org/10.1109/LCOMM.2019.2907935
• Keywords: Real-Time Systems; Status Update; Information Freshness; Peak Age of information; Zero-Wait Policy
• Public URL: http://researchrepository.napier.ac.uk/Output/1692317