REFWA plus: enhancement of REFWA to combat link errors in LEO satellite networks
REFWA plus: enhancement of REFWA to combat link errors in LEO satellite networks
复制标题
REFWA plus：增强 REFWA 以解决 LEO 卫星网络中的链路错误
DOI：
10.1109/hpsr.2005.1503217
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Y. Nemoto
中科院分区：
文献类型：
--
作者：
T. Taleb;Nei Kato;Y. Nemoto
作为卫星环境的一个显着特征，高误码率 (BER) 会损害卫星网络上传输控制协议 (TCP) 的性能。本文提出了一种错误恢复机制，以进一步提高递归、显式和公平窗口调整（REFWA）方案的性能[T. Taleb 等人，2004 年 2 月] [T. Taleb 等人，2004 年 6 月]在卫星 IP 网络中。提议的机制称为 REFWA plus。卫星网络丢失恢复的基本挑战在于区分拥塞引起的数据包丢失和链路错误引起的数据包丢失。在所提出的机制中，这种区别基于 REFWA 方案向 TCP 发送方发出的显式拥塞反馈的新旧值的比较。实际上，由于网络拥塞导致的数据包丢失之前可能会出现计算反馈的减少，而随后反馈增加的数据包丢失可能是由于链路错误造成的。进行了一组模拟来评估 REFWA plus 方案的性能。仿真结果表明，与TCP Newreno、TCP Westwood和REFWA相比，该方案提高了系统公平性，即使在高误码率环境下也能更好地利用瓶颈链路。
As a distinguished characteristic of satellite environments, high bit error rates (BER) impair the performance of the transmission control protocol (TCP) over satellite networks. In this paper, an error recovery mechanism is proposed to further improve the performance of the recursive, explicit, and fair window adjustment (REFWA) scheme [T. Taleb et al., Feb 2004] [T. Taleb et al., June 2004] in satellite IP networks. The proposed mechanism is called REFWA plus. The fundamental challenge in loss recovery over satellite networks consists in distinguishing between congestion induced packet drops from those due to link errors. In the proposed mechanism, this distinction is based on comparison of the new and old values of the explicit congestion feedback signaled by the REFWA scheme to TCP senders. Effectively, a packet drop due to network congestion is likely to be preceded by a decrease in the computed feedback, whereas packet drops that are followed by an increased feedback are likely to be due to link errors. A set of simulations is conducted to evaluate the performance of the REFWA plus scheme. Simulation results demonstrate that compared to TCP Newreno, TCP Westwood, and REFWA, the proposed scheme improves the system fairness and makes better utilization of the bottleneck link even in environments with high bit error rates.