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Computer Science > Information Theory

arXiv:2009.14439 (cs)
[Submitted on 29 Sep 2020 (v1), last revised 5 Feb 2021 (this version, v2)]

Title:Moment Generating Function of the AoI in a Two-Source System With Packet Management

Authors:Mohammad Moltafet, Markus Leinonen, Marian Codreanu
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Abstract:We consider a status update system consisting of two independent sources and one server in which packets of each source are generated according to the Poisson process and packets are served according to an exponentially distributed service time. We derive the moment generating function (MGF) of the age of information (AoI) for each source in the system by using the stochastic hybrid systems (SHS) under two existing source-aware packet management policies which we term self-preemptive and non-preemptive policies. In the both policies, the system (i.e., the waiting queue and the server) can contain at most two packets, one packet of each source; when the server is busy and a new packet arrives, the possible packet of the same source in the waiting queue is replaced by the fresh packet. The main difference between the policies is that in the self-preemptive policy, the packet under service is replaced upon the arrival of a new packet from the same source, whereas in the non-preemptive policy, this new arriving packet is blocked and cleared. We use the derived MGF to find the first and second moments of the AoI and show the importance of higher moments.
Comments: 15 pages, 3 figures. arXiv admin note: text overlap with arXiv:2001.03959
Subjects: Information Theory (cs.IT)
Cite as: arXiv:2009.14439 [cs.IT]
  (or arXiv:2009.14439v2 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.2009.14439

Submission history

From: Mohammad Moltafet [view email]
[v1] Tue, 29 Sep 2020 11:54:25 UTC (108 KB)
[v2] Fri, 5 Feb 2021 09:39:31 UTC (145 KB)
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