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Future Internet 2016, 8(1), 1; doi:10.3390/fi8010001

Priority Queues with Fractional Service for Tiered Delay QoS

Department of EECS, Northwestern University, Evanston, IL 60201, USA
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Fernando Cerdán
Received: 28 October 2015 / Revised: 4 December 2015 / Accepted: 14 December 2015 / Published: 29 December 2015
(This article belongs to the Special Issue Managing QoS and QoE Levels in Wired and Wireless Data Networks)
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Packet scheduling is key to quality of service (QoS) capabilities of broadband wired and wireless networks. In a heterogeneous traffic environment, a comprehensive QoS packet scheduler must strike a balance between flow fairness and access delay. Many advanced packet scheduling solutions have targeted fair bandwidth allocation while protecting delay-constrained traffic by adding priority queue(s) on top of a fair bandwidth scheduler. Priority queues are known to cause performance uncertainties and, thus, various modifications have been proposed. In this paper, we present a packet queueing engine dubbed Fractional Service Buffer (FSB), which, when coupled with a configurable flow scheduler, can achieve desired QoS objectives, such as fair throughputs and differentiated delay guarantees. Key performance metrics, such as delay limit and probability of delay limit violation, are derived as a function of key FSB parameters for each delay class in the packet queueing engine using diffusion approximations. OPNET simulations verify these analytical results. View Full-Text
Keywords: quality of service; modeling; simulation; diffusion approximation; broadband routers quality of service; modeling; simulation; diffusion approximation; broadband routers

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chang, G.; Lee, C.-C. Priority Queues with Fractional Service for Tiered Delay QoS. Future Internet 2016, 8, 1.

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