Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete-time Queueing Model of Age of Information with Multiple
  Information Sources   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 paper, we study a discrete-time server arising in multi-source
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 geometric 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: i)
Non-Preemptive Bufferless (NPB) ii) Preemptive Bufferless (PB) iii)
Non-Preemptive Single Buffer with Replacement (NPSBR). The proposed numerical
algorithm employs the theory of Discrete-Time Markov Chains (DTMC) of
Quasi-Birth-Death (QBD) type and is matrix analytical, i.e, the algorithm is
based on numerically stable and efficient vector-matrix operations.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.

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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: econ