Analysis of Age of Information in Multisource Communication Networks

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Asavdi, Sepehr | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 54239 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Ashtiani, Farid
Abstract:
In this thesis, we investigate the age of information in multisource networks. To this end, in the first phase of this thesis, we evaluate the Age of Information (AoI) in slotted ALOHA network. Regarding the interactions among the nodes in such a network, we model the memory of this network with a Trellis and find the peak Age of Information (PAoI) by using this Trellis. Then, we evaluate Age of Information-constrained regions and achievable throughput regions in the slotted ALOHA network and optimize Age of information in a symmetric case. In the second phase, we propose an efficient prioritizing scheme from AoI point of view and find the distribution of AoI and PAoI in such a scheme with two different classes of packets. Then, by proposing an equivalent scheme from the point of view of a typical class, we find these distributions by a recursive approach. We show the efficiency of this prioritizing scheme by comparing its performance with another scheme and in a special case, we optimize a linear combination of different classes AoI
Keywords:
Queuing Theory ; Prioritizing Process ; Slotted ALOHA ; Information Age ; Information Peak Age

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