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An aggregate marker for bandwidth fairness in DiffServ
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DOI：10.1016/j.jnca.2012.07.020.png)
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摘要
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Surveys and studies on DiffServ exhibit existence of unfairness between aggregates in the excess bandwidth region. Many researchers have proved that providing a proportional fair share of the bandwidth between aggregates solve this. Based on this, aggregate markers such as ItswTCM and I2tswTCM are found to improve bandwidth fairness in DiffServ network among aggregates, when the aggregates are responsive in nature. However, co-existence of non-responsive aggregates with responsive aggregates leads to unfairness. Hence, in this paper an attempt has been made to evade the above unfairness by a new TSW based marker; where the drop precedence of the packet is arrived at an adaptive manner based on its estimated rate and the availability of the network resource. The unique feature of this proposed algorithm is that it provides enhanced fairness not only among responsive aggregates but also between responsive and non-responsive aggregates. Further, simulations have been carried out in NS-2 with changes in RTT, target rate of the aggregates and the number of flows in the aggregate. The results show that the proposed marker reduces the influence of these factors on the fairness performance exhibiting the suitability of the marker for different network topologies. (c) 2012 Elsevier Ltd. All rights reserved.
Keyword:
Differentiated Services
Bandwidth fairness
Aggregate marker
Packet marking algorithms
Responsive flows
Target rate
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