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Mesh WDM optical network survivability protection algorithm

Author: WeiXueTao
Tutor: LiLeMin
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: WDM Optical Network Survivability Protection Restoration
CLC: TN929.1
Type: Master's thesis
Year: 2007
Downloads: 47
Quote: 1
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Abstract

With the rapid growth of Internet traffic brought on the huge demand for bandwidth and capacity, wavelength division multiplexing WDM (Wavelength Division Multiplexing) technology has become the core of the next generation backbone network transmission technology. WDM transmission technology and the use of a wavelength routing network architecture in the physical or virtual topology optical layer, providing high-capacity and high-rise structure variable transmission channel, will become the next generation of the core backbone network transmission. However, due to the transmission of each wavelength carrying capacity can be high Dajibite per second, network failures (eg fiber link breakage, node failure, etc.) can cause a lot of business interruption. Therefore, WDM optical network survivability design becomes extremely important. Survivability strategies include protection and restoration of two categories. Protection means, reserved in advance for the protection of business good distribution of resources, when a fault occurs, the business can be protected by a reserved resource carrying. Recovery is not reserved in advance for the protection of resources allocated business, when a fault occurs, and then dynamically find the network to carry the surplus resources affected by the failure of the business. Based on survivability design ideas, we study mesh WDM network design issues invulnerability, focus on these aspects: single link failure mixed protection mechanism to ensure the availability of time-varying, and three of three WDM networks connectivity link failure protection issues. Previous literature are based on a single business and single survivability mechanisms discussed, along with the increase in business, priority services appear inevitable. Used for high-priority traffic protection mechanism for low-priority traffic using recovery mechanisms, and high-priority traffic backup path with low priority work path shared network resources. Mixed protective efficient use of network resources for anti-crash protection design business. Hybrid Protection combines the protection mechanisms and characteristics of recovery mechanisms, which can be on resource utilization and congestion rate achieved good performance. At present, some research literature is only used to protect mixed integer linear programming problem to describe and optimize network resources, but no specific heuristic algorithms. In response to these problems, this paper studied the second chapter of invulnerability WDM mesh hybrid optical network protection algorithm design problems, the main contributions include: 1) presented a detailed priority-based heuristic algorithms. 2) propose a new backup resource sharing strategies to further improve resource utilization and reduce congestion rate. Therefore, this chapter has proposed a strengthening of resources shared protection algorithm, which uses a new routing strategy to try to find low-priority business resources as a high priority backup path resources. Finally, the author analyzed by simulation performance of the algorithm. Usability is defined as a period of time, the system or connect the probability of working. Depending on the level of availability to provide protection for the user, can be more rational allocation of network resources, so this third chapter of the WDM mesh optical networks to support usability assurance mechanisms, the main contributions include: 1) analysis of the time- does not change the usability problems and their computational model assurance mechanisms. 2) presents a dynamic network environments varying availability guarantee mechanism, which is the core idea of ??the duration of the connection from the business point of view, for the duration of the operations occur within different availability requirements, through the adjustment of backup resources to achieve customer requirements to ensure availability. Simulation results show that the mechanism is unchanged compared usability assurance mechanisms can save more network resources, reduce congestion and improve network throughput rate. In the current network, along with the gradual expansion of the network size, the optical backbone network bearer type of business is growing increasingly diverse. Dual-link failure protection can no longer be satisfied with some customers. These customers need to be able to three link failures survivability. Existing literature has been proposed for the dual-link failure, the usual approach is to first calculate the working path, then put all the links on the working path removed, and then the rest of the network computing two separate risk protection path. Similarly, for the three link failure problem, we work to find a way and three way protection. But it has three WDM network connectivity is not feasible, because we can not in a three-connected graph link to find out four completely separate paths. This chapter studies this problem, the main contribution: Through analysis, we found that children with the backup path can effectively solve this problem by calculating the source node and the destination node to the intermediate node of several backup sub-path, to communicate on the three waves division multiplexing of the three network link failures for protection. Simulation results show that the protection method is to protect three connectivity link failure WDM network three a practical and effective method.

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