Age of Information Aware Cache Updating with File-and Age-Dependent Update Durations

Haoyue Tang, Philippe Ciblat, Jintao Wang, Michele Wigger, Roy Yates

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We consider a system consisting of a library of time-varying files, a server that at all times observes the current version of all files, and a cache that at the beginning stores the current versions of all files but afterwards has to update these files from the server. Unlike previous works, the update duration is not constant but depends on the file and its Age of Information (AoI), i.e., of the time elapsed since it was last updated. The goal of this work is to design an update policy that minimizes the average AoI of all files with respect to a given popularity distribution. Actually a relaxed problem, close to the original optimization problem, is solved and a practical update policy is derived. The update policy relies on the file popularity and on the functions that characterize the update durations of the files depending on their AoI. Numerical simulations show a significant improvement of this new update policy compared to the so-called square-root policy that is optimal under file-independent and constant update durations.

Original languageEnglish (US)
Title of host publication2020 18th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, WiOPT 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9783903176294
StatePublished - Jun 2020
Event18th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, WiOPT 2020 - Volos, Greece
Duration: Jun 15 2020Jun 19 2020

Publication series

Name2020 18th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, WiOPT 2020

Conference

Conference18th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, WiOPT 2020
Country/TerritoryGreece
CityVolos
Period6/15/206/19/20

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Information Systems and Management
  • Control and Optimization
  • Modeling and Simulation

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