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首页> 外文会议>International Conference on Computational Science and Its Applications(ICCSA 2004) pt.4; 20040514-20040517; Assisi; IT >A Hybrid Restoration Scheme Based on Threshold Reaction Time in Optical Burst-Switched Networks
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A Hybrid Restoration Scheme Based on Threshold Reaction Time in Optical Burst-Switched Networks

机译：光突发交换网络中基于阈值反应时间的混合恢复方案

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摘要

Optical Burst-Switched (OBS) networks usually employ one-way reservation by sending a burst control packet (BCP) with a specific offset time, before transmitting each data burst frame (BDF). Therefore, a fiber link failure may lead to loss of several BDFs as the ingress nodes sending these BDFs remain unaware of the failed link till they receive the failure indication signal (FIS). In this paper, we propose a hybrid restoration scheme, wherein we employ a novel combination of sub-path as well as path restoration schemes. In particular, the upstream node preceding the failed link employs sub-path restoration as soon as it detects the failure. Thereafter, when the source ingress node receives the FIS message, it (source ingress node) takes over the responsibility and employs path restoration. However, sub-path restoration is exercised by the upstream node only if the remaining time intervals left for the yet-to-arrive BDFs (for which BCPs have already left the upstream node) are less than a minimum time interval (called as threshold reaction time). Performance of the proposed scheme is evaluated through extensive computer simulation using OPNET. Our results indicate that the proposed restoration scheme significantly reduces burst losses due to link failure and, thus, outperforms the existing restoration schemes.
机译：光突发交换（OBS）网络通常在发送每个数据突发帧（BDF）之前通过发送具有特定偏移时间的突发控制包（BCP）来采用单向预留。因此，光纤链路故障可能导致几个BDF丢失，因为发送这些BDF的入口节点在收到故障指示信号（FIS）之前一直不知道发生故障的链路。在本文中，我们提出了一种混合恢复方案，其中我们采用了子路径以及路径恢复方案的新颖组合。特别是，出现故障的链接之前的上游节点一旦检测到故障，便会采用子路径还原。此后，当源入口节点接收到FIS消息时，它（源入口节点）接管责任并采用路径恢复。但是，只有当尚未到达的BDF（BCP已经离开上游节点）的剩余剩余时间间隔小于最小时间间隔（称为阈值反应）时，上游节点才执行子路径恢复。时间）。通过使用OPNET进行广泛的计算机仿真，可以评估所提出方案的性能。我们的结果表明，提出的恢复方案显着减少了由于链路故障而导致的突发损失，因此，其性能优于现有的恢复方案。

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