6 research outputs found
Peak Age of Information Distribution for Edge Computing with Wireless Links
Age of Information (AoI) is a critical metric for several Internet of Things
(IoT) applications, where sensors keep track of the environment by sending
updates that need to be as fresh as possible. The development of edge computing
solutions has moved the monitoring process closer to the sensor, reducing the
communication delays, but the processing time of the edge node needs to be
taken into account. Furthermore, a reliable system design in terms of freshness
requires the knowledge of the full distribution of the Peak AoI (PAoI), from
which the probability of occurrence of rare, but extremely damaging events can
be obtained. In this work, we model the communication and computation delay of
such a system as two First Come First Serve (FCFS) queues in tandem,
analytically deriving the full distribution of the PAoI for the M/M/1 - M/D/1
and the M/M/1 - M/M/1 tandems, which can represent a wide variety of realistic
scenarios.Comment: Preprint version of the paper accepted for publication in the
Transactions on Communication
Towards AoI-aware Smart IoT Systems
Age of Information (AoI) has gained importance as a Key Performance Indicator
(KPI) for characterizing the freshness of information in information-update
systems and time-critical applications. Recent theoretical research on the
topic has generated significant understanding of how various algorithms perform
in terms of this metric on various system models and networking scenarios. In
this paper, by the help of the theoretical results, we analyzed the AoI
behavior on real-life networks, using our two test-beds, addressing IoT
networks and regular computers. Excessive number of AoI measurements are
provided for variations of transport protocols such as TCP, UDP and web-socket,
on wired and wireless links. Practical issues such as synchronization and
selection of hardware along with transport protocol, and their effects on AoI
are discussed. The results provide insight toward application and transport
layer mechanisms for optimizing AoI in real-life networks
Measuring age of information on real-life connections
Age of Information (AoI) is a relatively new metric to measure freshness of networked application such as real-time monitoring of status updates or control. The AoI metric is discussed in the literature mainly in a theoretical way. In this work, we want to point out the issues related to the measuring AoI-related values, such as synchronization and calculation of the values. We discussed the effect of synchronization error in the measurement and a solution for calculating an estimate of average AoI without any synchronization