When to Preempt in a Status Update System?

Subhankar Banerjee; Sennur Ulukus

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arXiv · 2402.00845

When to Preempt in a Status Update System?

Subhankar Banerjee·Sennur Ulukus

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Abstract

We consider a time-slotted status update system with an error-free preemptive queue. The goal of the sampler-scheduler pair is to minimize the age of information at the monitor by sampling and transmitting the freshly sampled update packets to the monitor. The sampler-scheduler pair also has a choice to preempt an old update packet from the server and transmit a new update packet to the server. We formulate this problem as a Markov decision process (MDP) and find the optimal sampling policy. We find a sufficient, and also separately a necessary, condition for the always preemption policy to be an optimal policy. We show that it is optimal for the sampler-scheduler pair to sample a new packet immediately upon the reception of an update packet at the monitor. We propose a double-threshold sampling policy which we show to be an optimal policy under some assumptions on the queue statistic.

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Subhankar Banerjee, Sennur Ulukus. 2024-05-20. When to Preempt in a Status Update System?. https://arxiv.org/abs/2402.00845

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