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首页> 外文会议>Information Networking: Advances in Data Communications and Wireless Networks; Lecture Notes in Computer Science; 3961 >Dropping Policy for Improving the Throughput of TCP over Optical Burst-Switched Networks
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Dropping Policy for Improving the Throughput of TCP over Optical Burst-Switched Networks

机译：通过光突发交换网络提高TCP吞吐量的丢弃策略

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摘要

Burst loss due to contention in Optical Burst-Switched (OBS) networks significantly degrades the throughput of TCP sources in the local access networks because TCP congestion control mechanism makes a TCP source enter a slow start phase regardless of the congestion degree of OBS networks. In this paper, to improve TCP throughput over OBS networks, we first introduce a dropping policy (DP) with retransmission of the bursts dropped due to contention, by the ingress node. Then, we extend the DP with retransmission to drop a burst that has experienced fewer retransmissions in the event of contention in order to reduce the number of events that a TCP source enters the slow start phase due to contention. Additionally, we propose to limit the number of retransmissions of each burst to prevent severe congestion. For the performance evaluation of the proposed schemes, we provide an analytic model of TCP throughput over OBS networks. It is shown via numerical and simulation results that the proposed schemes can achieve better TCP throughput performance than an existing DP without retransmission.
机译：由于光突发交换（OBS）网络中的争用而导致的突发丢失会大大降低本地访问网络中TCP源的吞吐量，因为TCP拥塞控制机制使TCP源进入慢启动阶段，而不管OBS网络的拥塞程度如何。在本文中，为了提高OBS网络上的TCP吞吐量，我们首先介绍了一种丢弃策略（DP），其中重入了由于争用而由入口节点丢弃的突发。然后，我们使用重传扩展DP，以丢弃发生争用时经历较少重传的突发，以减少TCP源由于争用进入慢启动阶段的事件数量。此外，我们建议限制每个突发的重传次数，以防止严重的拥塞。为了评估所提出方案的性能，我们提供了OBS网络上TCP吞吐量的解析模型。通过数值和仿真结果表明，与不进行重传的现有DP相比，所提出的方案可以实现更好的TCP吞吐量性能。

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