Dynamic RMSA in spectrum-sliced elastic optical networks for high-throughput service provisioning

We propose several novel dynamic routing, modulation and spectrum assignment (RMSA) algorithms for high-throughput service provisioning in spectrum-sliced elastic optical networks. The proposed algorithms can be applied to network provisioning, where a network operator needs to figure out an efficient way to serve each dynamic connection request based on current network status. The proposed algorithms can be categorized into two categories, dynamic RMSA using online path computation and dynamic RMSA using path-set updates. The former one updates link metrics based on their spectrum utilization status dynamically, and performs RMSA with online routing path computation for each request. The latter one pre-computes K shortest routing paths as the path-set for each source-destination pair in the network topology, performs RMSA based on different path-selection policies during dynamic provisioning, and updates a path-set by adding a new path in when a path in the set is not available for a request. We evaluate the proposed algorithms with simulations using the Poisson traffic model in a 14-node NSFNET topology. Simulation results indicate that the proposed algorithms outperform existing dynamic RMSA algorithm by providing lower bandwidth blocking probability, and reduce the blocking probability by one magnitude or more when the traffic load is light (≤ 700 Erlangs). The comparisons on network resource utilization also indicate that the proposed algorithms achieve larger resource utilization and hence provide higher throughput for network operations.