Multicast protection and grooming scheme in survivable WDM optical networks
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- 作者：Ashok Kumar Pradhan ; Sayan Ghose ; Tanmay De
- 关键词：Backup tree ; Grooming ; Light-tree ; Shared protection ; Working tree ; Wavelength division multiplexing (WDM)
- 刊名：Optical Switching and Networking
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：19
- 期：part_P2
- 页码：42-57
- 全文大小：2978 K
文摘
Network survivability is an important factor in the design of WDM optical networks. In dynamic provisioning context, a typical connection request may require bandwidth less than a wavelength channel capacity and it may also require protection from network failure, typically fiber cuts. In this paper, we investigate the multicast traffic protection with grooming in WDM mesh network under single link failure and propose a novel multicast protection algorithm called shared segment protection with grooming (SSPG) that constructs the primary or working light-tree and corresponding link disjoint backup light-tree for each dynamic multicast connection request. In this approach, a backup segment can efficiently share the wavelength channel capacity of its working segments and simultaneously use the common network resources at the backup light-tree. In order to efficiently utilize the network resources (such as wavelength, transceivers, optical splitters and wavelength channels), the sub-wavelength demands are groomed to protect multicast requests against single link failure. The main objective of this work is to minimize the blocking probability of client calls or bandwidth blocking probability of a dynamically changing multicast request of WDM optical networks and efficiently utilize the network resources, respectively. The performances of various algorithms are evaluated based on extensive simulations to study dynamic provisioning of survivable multicast sessions in standard WDM mesh networks. The simulation results reveal that the proposed SSPG produces better performance in terms of blocking probability (in terms of requests), bandwidth blocking probability (in terms of bandwidth capacity), wavelength channel utilization and cost which is associated with the network resources such as transceivers, splitters and wavelengths than existing standard link shared protection with grooming (LSPG) and path-pair shared protection with grooming (PSPG) algorithms.