Information Freshness Analysis of Slotted ALOHA in Gilbert-Elliot Channels

03/24/2021

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by   Andrea Munari, et al.

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This letter analyzes a class of information freshness metrics for large IoT systems in which terminals employ slotted ALOHA to access a common channel. Considering a Gilbert-Elliot channel model, information freshness is evaluated through a penalty function that follows a power law of the time elapsed since the last received update, generalizing the age of information metric. By means of a signal flow graph analysis of Markov processes, we provide exact closed form expressions for the average penalty and for the peak penalty violation probability.