• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optical fiber technology >Quasi Path Restoration: A post-failure recovery scheme over pre-allocated backup resource for elastic optical networks
【24h】

Quasi Path Restoration: A post-failure recovery scheme over pre-allocated backup resource for elastic optical networks

机译：准路径还原：弹性光网络上预分配备份资源的故障后恢复方案

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spectrum conflict during primary and backup routes assignment in elastic optical networks results in increased resource consumption as well as high Bandwidth Blocking Probability. In order to avoid such conflicts, we propose a new scheme, Quasi Path Restoration (QPR), where we divide the available spectrum into two: (1) primary spectrum (for primary routes allocation) and (2) backup spectrum (for rerouting the data on link failures). QPR exhibits three advantages over existing survivable strategies such as Shared Path Protection (SPP), Primary First Fit Backup Last Fit (PFFBLF), Jointly Releasing and re-establishment Defragmentation SPP (JRDSSPP), and Path Restoration (PR): (1) the conflict between primary and backup spectrum during route assignment is completely eliminated, (2) upon a link failure, connection recovery requires less backup resources compared to SPP, PFFBLF, and PR, and (3) availability of the same backup spectrum on each link improves the recovery guarantee. The performance of our scheme is analyzed with different primary backup spectrum partitions on varying connection-request demands and number of frequency slots. Our results show that QPR provides better connection recovery guarantee and Backup Resources Utilization (BRU) compared to bandwidth recovery of PR strategy. In addition, we compare QPR with Shared Path Protection and Primary First-Fit Backup Last Fit strategies in terms of Bandwidth Blocking Probability (BBP) and average frequency slots per connection request. Simulation results show that BBP of SPP, PFFBLF, and JRDSPP varies between 18.59% and 14.42%, while in QPR, BBP ranges from 2.55% to 17.76% for Cost239, NSFNET, and ARPANET topologies. Also, QPR provides bandwidth recovery between 93.61% and 100%, while in PR, the recovery ranges from 86.81% to 98.99%. It is evident from our analysis that QPR provides a reasonable trade-off between bandwidth blocking probability and connection recoverability.
机译：弹性光网络中主路由和备用路由分配期间的频谱冲突会导致资源消耗增加以及带宽阻塞概率较高。为了避免此类冲突，我们提出了一种新方案，即准路径恢复（QPR），其中将可用频谱分为两部分：（1）主频谱（用于主路由分配）和（2）备用频谱（用于重新路由链接失败数据）。与现有的生存策略相比，QPR具有三个优势，例如共享路径保护（SPP），主要优先选择后备优先选择（PFFBLF），联合释放和重建碎片整理SPP（JRDSSPP）和路径恢复（PR）：（1）完全消除了路由分配过程中主频谱和备用频谱之间的冲突；（2）发生链路故障时，与SPP，PFFBLF和PR相比，连接恢复所需的备份资源更少；（3）每个链路上相同备份频谱的可用性得到改善恢复保证。我们根据不同的连接请求需求和频率时隙数量，使用不同的主备用频谱分区来分析我们方案的性能。我们的结果表明，与PR策略的带宽恢复相比，QPR提供了更好的连接恢复保证和备份资源利用率（BRU）。此外，我们在带宽阻塞概率（BBP）和每个连接请求的平均时隙方面，将QPR与共享路径保护和首选的First-Fit Backup Last Fit策略进行了比较。仿真结果表明，SPP，PFFBLF和JRDSPP的BBP在18.59％和14.42％之间变化，而在QPR中，对于Cost239，NSFNET和ARPANET拓扑，BBP的范围从2.55％到17.76％。此外，QPR可提供93.61％和100％之间的带宽恢复，而在PR中，恢复范围为86.81％至98.99％。从我们的分析中可以明显看出，QPR在带宽阻塞概率和连接可恢复性之间提供了合理的权衡。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号