Resource allocation method for reliable transmission of requests based on shared backup path protection and fragmentation-aware in elastic optical networks

Abstract

Elastic optical networks can effectively adapt to complex and dynamic network conditions, improving spectrum resource utilization. However, if the link fails, it will cause significant data loss or interruption to the network operator. Therefore, we propose a reliable routing, modulation, and spectrum allocation (SBPP-FA-RRMSA) algorithm based on shared backup path protection (SBPP) and fragmentation-aware to guarantee reliable transmission of requests and solve spectrum fragmentation problem. In order to save resources, we adopt the SBPP method, we design the reliability of requests based on path failure probability, and also design a path cost function combined with the path resources to select the transmission path. Then, we propose a dynamic spectrum partitioning method to guarantee non-interference of the working resources and the backup resources. Finally, in terms of resource allocation, we design a path fragmentation ratio to allocate working resources, and a spectrum fitness function to allocate backup resources. Simulation results show that under the premise of considering link failures, the proposed SBPP-FA-RRMSA has lower bandwidth blocking probability and fragmentation ratio compared with the algorithms that do not consider the probability of failures, fragmentation, and shared backup path protection, and it also makes full use of the sharing of backup resources.