Quasi-stationary workload in a L\'evy-driven storage system

TL;DR

This paper investigates the long-term behavior of workload in a Le9vy-driven storage system conditioned on the busy period not ending, providing explicit transforms and asymptotic results for spectrally one-sided jumps.

Contribution

It introduces a method to analyze the quasi-stationary workload distribution using double Laplace transforms and asymptotic techniques, specifically for spectrally one-sided Le9vy processes.

Findings

Workload distributions at times 0 and t are both Erlang(2) for Brownian input.

Explicit double Laplace transform formulas are derived for spectrally one-sided jumps.

Asymptotic analysis reveals the limiting behavior of the workload conditioned on the busy period.

Abstract

In this paper we analyze the quasi-stationary workload of a L\'evy-driven storage system. More precisely, assuming the system is in stationarity, we study its behavior conditional on the event that the busy period $T$ in which time 0 is contained has not ended before time $t$, as $t\to\infty$. We do so by first identifying the double Laplace transform associated with the workloads at time 0 and time $t$, on the event $\{T>t\}.$ This transform can be explicitly computed for the case of spectrally one-sided jumps. Then asymptotic techniques for Laplace inversion are relied upon to find the corresponding behavior in the limiting regime that $t\to\infty.$ Several examples are treated; for instance in the case of Brownian input, we conclude that the workload distribution at time 0 and $t$ are both Erlang(2).