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Peak age of information in slotted ALOHA network

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posted on 2021-11-11, 07:03 authored by Sepehr AsvadiSepehr Asvadi, Farid Ashtiani

In this paper, we concentrate on the peak age of information (PAoI) in a discrete-time slotted ALOHA network comprised of M buffer-less nodes, capable of keeping just one packet at each time. In this network, whenever some nodes transmit their packets simultaneously, a collision happens, thus there is interaction among queues and transmission delay of a packet might prolong more than one slot. The packets are generated at each node stochastically and independently. The nodes follow preemptive queueing policy. In this network, we propose a new trellis-based analytical model to represent the interaction among queues and derive exact average PAoI in closed form. Furthermore, we find average PAoI-constrained regions and minimize average PAoI for a symmetric network, numerically. As a byproduct of our analysis, the achievable throughput region of two slotted ALOHA networks with unlimited buffer and buffer-less nodes are compared. We observe that the latter is superior not only in AoI, but also in achievable throughput region. Simulation results confirm our analysis.


Email Address of Submitting Author

ORCID of Submitting Author 0000-0002-1034-4515

Submitting Author's Institution

Sharif University of technology

Submitting Author's Country

  • Iran