Reliability-oriented Links Failure Probability Protection and Backup Reprovisioning Strategy for Elastic Optical Networks
LIU Huanlin① DU Jundan① YI Pengfei① CHEN Yong② ZHANG Mingjia①
①(Key Laboratory of Optical Communications and Networks, Chongqing University of Posts and Telecommunications, Chongqing 400065, China) ②(School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)
Abstract：Due to the high resource redundancy of full protection for request’s multi-link failure in elastic optical networks, a strategy of Reliability Oriented Probability Protection and Backup Reprovisioning (ROPP-BR) is proposed. In the ROPP-BR, an adaptive adjustment working and protection link cost functions are devised to effectively select the alternative working and protection light-paths respectively which have high reliability and consume a small amount of spectrum resources in the multi-link failure. The cost function sufficiently considers the spectrum resources consumption and the link failure probability for both working and protection paths. Meanwhile, in order to satisfy the differentiated reliability requirements, a reliability oriented probability protection mechanism is introduced. And a theoretical analysis model is established to estimate the service reliability for light- paths in optical networks with probability protection, so the probability protection path can be flexibly configured under the restriction of the reliability requirements of the request. Moreover, for further improving protection sharing efficiency, when the request will be blocked for shortage of idle spectrum resource, a backup reprovisioning method based on maximum clique, is put forward to reconfigure the protection paths and spectrum resources. The simulation results indicate that the proposed ROPP-BR strategy can synthetically consider the performance of bandwidth blocking probability and service reliability, and effectively reduce the redundancy of protection resources.
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