Technical Program

Paper Detail

Paper Title Age-Delay Tradeoffs in Single Server Systems
Paper IdentifierMO3.R2.4
Authors Rajat Talak, Eytan Modiano, Massachusetts Institute of Technology, United States
Session Age of Information I
Location Saint Germain, Level 3
Session Time Monday, 08 July, 14:30 - 16:10
Presentation Time Monday, 08 July, 15:30 - 15:50
Manuscript  Click here to download the manuscript
Abstract Information freshness and low latency communication is important to many emerging applications. While Age of Information (AoI) serves as a metric of information freshness, packet delay is a traditional metric of communication latency. We prove that there is a natural tradeoff between the AoI and packet delay. We consider a single server system, in which at most one update packet can be serviced at a time. The system designer controls the order in which the packets get serviced and the service time distribution, with a given service rate. We analyze two tradeoff problems that minimize packet delay and the variance in packet delay, respectively, subject to an average age constraint. We prove a strong age-delay and age-delay variance tradeoff, wherein, as the average age approaches its minimum, the delay and its variance approach infinity. We show that the service time distribution that minimizes average age, must necessarily have an unbounded-second moment.