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4 - Controlling the Age of Information: Buffer Size, Deadlines, and Packet Management

Published online by Cambridge University Press:  02 February 2023

Nikolaos Pappas
Affiliation:
Linköpings Universitet, Sweden
Mohamed A. Abd-Elmagid
Affiliation:
Virginia Tech
Bo Zhou
Affiliation:
Nanjing University of Aeronautics and Astronautics, China
Walid Saad
Affiliation:
Virginia Tech
Harpreet S. Dhillon
Affiliation:
Virginia Tech
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Summary

The Age of Information metric, which is a measure of the freshness of a continually updating piece of information as observed at a remote monitor, has been studied for a variety of different update monitoring systems. In this chapter, we introduce three network control mechanisms for controlling the age, namely, buffer size, packet deadlines, and packet management. In the case of packet deadlines, we analyze update monitoring system for the cases of a fixed deadline and a random exponential deadline and derive closed-form expressions for the average age. We also derive a closed-form expression for the optimal average deadline for the random exponential case.

Type
Chapter
Information
Age of Information
Foundations and Applications
, pp. 89 - 114
Publisher: Cambridge University Press
Print publication year: 2023

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