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Fairness Guarantees and Achievable QoS in Differentiated Services

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2 Author(s)
Adegboyega, Abiola ; Broadband Networks Laboratory, Carleton University, Ottawa, Ontario, Canada, K1S 5B6. phone: 403-975-3738; e-mail: ; Lambadaris, I.

Achievable quality of service (QoS) among flows with disparate metrics in Differentiated Services (Diffserv) presents challenges for network edge traffic conditioners. A fair traffic conditioner was presented by M. El-Gendy and K. Shin in [1]. It provides fairness guarantees by inverting a form of the TCP rate equation as an edge conditioner. It achieves fairness by conditioning all flows regardless of the individual characteristics. We analyzed this conditioner in [2] for effectiveness and provided an enhancement in the area of packet loss rate estimation. We have continued our research and our new contributions are two fold. We present a trend factor in TCP loss rate dynamics and its effect on traffic conditioning. Here, we employed the Holt-Winters algorithm which integrates trend measurement in loss rate estimation. We also investigated the effect of the Time Sliding Window algorithm as a rate estimator on the trend factor and how it affects packet marking. We have analyzed the effectiveness of these two working in tandem in the achievement of fairness in Diffserv.

Published in:

Military Communications Conference, 2007. MILCOM 2007. IEEE

Date of Conference:

29-31 Oct. 2007