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Computer Science > Information Theory

Title: Optimizing Age of Information in Wireless Networks with Perfect Channel State Information

Abstract: Age of information (AoI), defined as the time elapsed since the last received update was generated, is a newly proposed metric to measure the timeliness of information updates in a network. We consider AoI minimization problem for a network with general interference constraints, and time varying channels. We propose two policies, namely, virtual-queue based policy and age-based policy when the channel state is available to the network scheduler at each time step. We prove that the virtual-queue based policy is nearly optimal, up to a constant additive factor, and the age-based policy is at-most factor 4 away from optimality. Comparing with our previous work, which derived age optimal policies when channel state information is not available to the scheduler, we demonstrate a 4 fold improvement in age due to the availability of channel state information.
Subjects: Information Theory (cs.IT); Networking and Internet Architecture (cs.NI)
Cite as: arXiv:1803.06471 [cs.IT]
  (or arXiv:1803.06471v1 [cs.IT] for this version)

Submission history

From: Rajat Talak [view email]
[v1] Sat, 17 Mar 2018 06:13:27 GMT (513kb,D)