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Paper details
Number 1 - March 2021
Volume 31 - 2021
The IoT gateway with active queue management
Adam Domański, Joanna Domańska, Tadeusz Czachórski, Jerzy Klamka, Jakub Szyguła, Dariusz Marek
Abstract
As the traffic volume from various Internet of things (IoT) networks increases significantly, the need for adapting the quality
of service (QoS) mechanisms to the new Internet conditions becomes essential. We propose a QoS mechanism for the IoT
gateway based on packet classification and active queue management (AQM). End devices label packets with a special
packet field (type of service (ToS) for IPv4 or traffic class (TC) for IPv6) and thus classify them as priority for real-time
IoT traffic and non-priority for standard IP traffic. Our AQM mechanism drops only non-priority packets and thus ensures
that real-time traffic packets for critical IoT systems are not removed if the priority traffic does not exceed the maximum
queue capacity. This AQM mechanism is based on the PIα controller with non-integer integration order. We use fluid flow
approximation and discrete event simulation to determine the influence of the AQM policy on the packet loss probability,
queue length and its variability. The impact of the long-range dependent (LRD) traffic is also considered. The obtained
results show the properties of the proposed mechanism and the merits of the PIα controller.
Keywords
active queue management, PI controller, dropping packets, fractional calculus, IoT gateway