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S-HOS: a self-adaptive hybrid optical switching

Hybrid optical switching (HOS) combines the advantages of optical circuit switching (OCS) and optical burst switching (OBS). But HOS can not dynamically change the optical switching paradigm according to the traffic fluctuation. it can not efficiently support burst traffic. And the utilization of some lightpath in HOS networks is low. To solve the problems, a self-adaptive hybrid optical switching (S-HOS) is proposed in the paper. In S-HOS networks, ingress edge nodes monitor the traffic between a pair of an ingress node and an egress node, and based on the monitor results edge nodes self-adaptively adjust optical switching paradigm. Based on minimum burst length maximum assembly period algorithm, a new assembly algorithm of S-HOS is proposed to improve the lightpath utilization and efficiently support burst IP traffic. And a data channel scheduling is proposed to assign data channel resources for the lightpaths and data bursts by regarding lightpath as a huge data burst. And it can decrease the complexity of hybrid optical switching and improve the network performance. Simulation results show that S-HOS outperforms OBS in term of IP packet dropping probability and end-to-end delay.