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      • Department of Electrical and Electronics Engineering
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      Discrete-time queueing model of age of information with multiple information sources

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      Author(s)
      Akar, Nail
      Doğan, Ozancan
      Date
      2021-01-22
      Source Title
      IEEE Internet of Things Journal
      Electronic ISSN
      2327-4662
      Publisher
      IEEE
      Volume
      8
      Issue
      19
      Pages
      14531 - 14542
      Language
      English
      Type
      Article
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      Abstract
      Information freshness in IoT-based status update systems has recently been studied through the Age of Information (AoI) and Peak AoI (PAoI) performance metrics. In this article, we study a discrete-time server arising in multisource IoT systems, which accepts incoming information packets from multiple information sources so as to be forwarded to a remote monitor for status update purposes. Under the assumption of Bernoulli information packet arrivals and a common general discrete phase-type service time distribution across all the sources, we numerically obtain the exact per-source distributions of AoI and PAoI in matrix-geometric form for three different queueing disciplines: 1) nonpreemptive bufferless; 2) preemptive bufferless; and 3) nonpreemptive single buffer with replacement. The proposed numerical algorithm employs the theory of discrete-time Markov chains of quasi-birth-death type and is matrix analytical. Numerical examples are provided to validate the accuracy and effectiveness of the proposed queueing model. We also present a numerical example on the optimum choice of the Bernoulli parameters in a practical IoT system with two sources with diverse AoI requirements.
      Keywords
      Age of Information (AoI)
      Discrete-time queues
      Peak AoI (PAoI)
      Markov chains of quasi-birth-death (QBD) type
      Permalink
      http://hdl.handle.net/11693/76779
      Published Version (Please cite this version)
      https://doi.org/10.1109/JIOT.2021.3053768
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      • Department of Electrical and Electronics Engineering 4011
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