Load-balanced adaptive routing flexible grouping spectrum and core assignment in SDM-EONs based on mixed super-channel

摘要

With the significant increasing of network bandwidth demands, the development of spatial division multiplexing elastic optical networks (SDM-EONs) attracts much attention from both academic and industry. Due to the continuity and contiguity constraints in spectrum allocation, the generation of spectrum fragments causes serious impacts on the performance of SDM-EONs. Meanwhile, the load imbalance is a main negative factor of SDM-EONs' performance. In this paper, we focus on the issues of spectrum fragmentation and load imbalance. Specifically, we first design a genetic algorithm-assisted offline weight modulation and an online dynamic weight adjustment strategy to realize load-balanced adaptive routing. Then, we introduce a flexible-grouping mechanism to suppress the generation of spectrum fragments. Finally, we propose a weight-updating and flexible-grouping routing, spectrum and core assignment (WUFG RSCA) algorithm based on mixed super-channel for SDM-EONs. Our simulation results confirm that the proposed algorithm obtains effective reduction in spectrum fragments and network service blocking probability. In addition, the results prove that the WUFG RSCA algorithm can improve the spectrum resource utilization and enhance the quality of service for transmission requests with high priority.