Dynamic Restoration in WDM Mesh Networks under Dynamic Traffic

Abstract

Network survivability is a crucial requirement in WDM optical networks. In this paper, we consider the issue of dynamic restoration in WDM networks with dynamic traffic demands, in which path-based restoration (PR) and link-based restoration (LR) are investigated in detail. Besides, we propose a more practical single-link failure model, in which the link-failure-interarrival time and link-failure-holding time are considered as two independent parameters. Based on this link-failure model, extensive numerical simulations are done to observe the dynamic survivable performance of WDM networks for path restoration scheme and link restoration scheme. The effective blocking probability, average path length, and restoration efficiency are employed as performance metrics to evaluate the survivable performance of PR and LR versus network traffic load, link failure frequency and link failure reparation time.