Performances Evaluation of Enhanced Basic Time Space Priority combined with an AQM

TL;DR

This paper evaluates a combined time-space priority mechanism with Active Queue Management (AQM) for multimedia traffic in HSDPA networks, demonstrating improved performance for non-real-time packets.

Contribution

It introduces a mathematical model for a combined EB-TSP and AQM scheme and compares its performance to a simple EB-TSP, highlighting the benefits of the combined approach.

Findings

Enhanced performance for NRT packets with AQM addition

Positive impact of AQM on delay and throughput

Mathematical model validated through numerical results

Abstract

Active Queue Management(AQM) is an efficient tool in the network to avoid saturation of the queue by warning the sender that the queue is almost full to reduce its speed before the queue is full. The buffer management schemes focus on space management, in the other hand scheduling priorities (focusing on time management) attempt to guarantee acceptable delay boundaries to applications for which it is important that delay is bounded. Combined mechanisms (time and space management) are possible and enable networks to improve the perceived quality for multimedia traffic at the end users. The key idea in this paper is to study the performance of a mechanism combining an AQM with a time-space priority scheme applied to multimedia flows transmitted to an end user in HSDPA network. The studied queue is shared by Real Time and Non Real Time packets. We propose a mathematical model using Poisson and MMPP processes to model the arrival of packets in the system. The performance parameters are analytically deducted for the Combined EB-TSP and compared to the case of Simple EB-TSP. Numerical results obtained show the positive impact of the AQM added to the EB-TSP on the performance parameters of NRT packets compared to the Simple EB-TSP.