Worst case age of information in wireless sensor networks : a multi-access channel
Moltafet, Mohammad; Leinonen, Markus; Codreanu, Marian (2019-11-14)
M. Moltafet, M. Leinonen and M. Codreanu, "Worst Case Age of Information in Wireless Sensor Networks: A Multi-Access Channel," in IEEE Wireless Communications Letters, vol. 9, no. 3, pp. 321-325, March 2020.
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https://urn.fi/URN:NBN:fi-fe2019121348054
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Abstract
Freshness of status update packets is essential for enabling a wide range of applications in wireless sensor networks (WSNs). Accordingly, we consider a WSN where sensors communicate status updates to a destination by contending for the channel access based on a carrier sense multiple access (CSMA) method. We analyze the worst case average age of information (AoI) and average peak AoI from the view of one sensor in a system where all the other sensors have a saturated queue. Numerical results illustrate the importance of optimizing the contention window size and the packet arrival rate to maximize the information freshness.
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