Browsing by Author "Mena, Juan P."

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    Age of information in IoT-based networked control systems: A MAC perspective
    (2023) Mena, Juan P.; Nunez, Felipe
    Timeliness of information is critical for accurate decision making in data-driven systems. As large-scale systems based on Internet of Things (IoT) technologies start populating shop floors, their performance in terms of timeliness must be assessed. This work analyzes age of information (AoI) in IoT-based control systems, where independent control loops share a wireless network. Analytical expressions for AoI under two typical MAC schemes used in IoT systems: CSMA/CA and TDMA are given and validated by simulations. The significance of the results is illustrated in the context of a design example.(c) 2022 Published by Elsevier Ltd.
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    On the Relation Between Peak Age and Stability in Control Loops Over Non-Beacon Enabled CSMA/CA
    (2021) Mena, Juan P.; Nunez, Felipe
    The proliferation of the Internet of Things has enabled implementing control loops using low-capable devices over non-deterministic networks. This letter addresses the use of non-beacon enabled CSMA/CA and motivates the need of minimizing the probability of peak age surpassing a bound, given in terms of two indicators of control over networks: the maximum allowable transmit interval and the maximum allowable delay. A concrete analytical result for calculating the probability is given, which represents an improvement of 50% with respect to a known bound at the optimal rate in a 5-loops control system.