Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Age of Information in Multi-Source Queueing Models   Freshness of status update packets is essential for enabling services where a
destination needs the most recent measurements of various sensors. In this
paper, we study the information freshness of single-server multi-source
queueing models under a first-come first-served (FCFS) serving policy. In the
considered model, each source independently generates status update packets
according to a Poisson process. The information freshness of the status updates
of each source is evaluated by the average age of information (AoI). We derive
an exact expression for the average AoI for the case with exponentially
distributed service time, i.e., for a multi-source M/M/1 queueing model.
Moreover, we derive three approximate expressions for the average AoI for a
multi-source M/G/1 queueing model having a general service time distribution.
Simulation results are provided to validate the derived exact average AoI
expression, to assess the tightness of the proposed approximations, and to
demonstrate the AoI behavior for different system parameters.

10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph