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The Age of Information: Real-Time Status Updating by Multiple Sources | IEEE Journals & Magazine | IEEE Xplore

The Age of Information: Real-Time Status Updating by Multiple Sources


Abstract:

We examine multiple independent sources providing status updates to a monitor through simple queues. We formulate an age of information (AoI) timeliness metric and derive...Show More

Abstract:

We examine multiple independent sources providing status updates to a monitor through simple queues. We formulate an age of information (AoI) timeliness metric and derive a general result for the AoI that is applicable to a wide variety of multiple source service systems. For first-come first-served and two types of last-come first-served systems with Poisson arrivals and exponential service times, we find the region of feasible average status ages for multiple updating sources. We then use these results to characterize how a service facility can be shared among multiple updating sources. A new simplified technique for evaluating the AoI in finite-state continuous-time queuing systems is also derived. Based on stochastic hybrid systems, this method makes AoI evaluation to be comparable in complexity to finding the stationary distribution of a finite-state Markov chain.
Published in: IEEE Transactions on Information Theory ( Volume: 65, Issue: 3, March 2019)
Page(s): 1807 - 1827
Date of Publication: 20 September 2018

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