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

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.
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https://hal.archives-ouvertes.fr/hal-02940587
Contributor : Mustapha Hamad <>
Submitted on : Wednesday, September 16, 2020 - 1:45:48 PM
Last modification on : Thursday, December 10, 2020 - 4:49:11 PM
Long-term archiving on: : Thursday, December 3, 2020 - 8:12:33 AM

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Haoyue Tang, Philippe Ciblat, Jintao Wang, Michèle Wigger, Roy Yates. Age of Information Aware Cache Updating with File-and Age-Dependent Update Durations. 18th IEEE WiOPT, Jun 2020, Volos, Greece. ⟨hal-02940587⟩

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