Interlayer Mapping Mechanism And Algorithm Research In Flex-Grid Optical Networks

In the promotion of the flourishing Internet technology, more bandwidth demanding, dynamic and heterogeneous services such as cloud computing, HD/UHD video on demand streaming and live VM migration continue to spring up. These kinds of service challenge the optical network infrastructure in transmission capacity and bandwidth flexibility. Since the fix grid Wavelength Division Multiplexing (WDM) network cannot provide ultra-high bandwidth transmission and flexible bandwidth allocation, the researches proposed the Flex-Grid network. Meanwhile the network virtualization technology which is to optimize the rigid traditional network architecture mature, the virtual network becomes an important network application. A reasonable mechanism of interlayer mapping between physical layer and network application layer, including end-to-end services and virtual networks, in the characteristic of Flex-Grid network, make fully use of the network spectrum resource.This topic studies the interlayer mapping mechanism and algorithm in Flex-Grid network, and the network architecture supports interlayer mapping. The major contribution of this paper includes:1. To solve the problem of Spectrum Fragment, this paper proposed Service Mapping Algorithms based on Spectrum Fragment Concatenation including First Fit, Best Fit and Worst Fit. The result of experiment shows that the Service Mapping Algorithms based on Spectrum Fragment Concatenation reduces the service blocking rate and the bandwidth blocking rate, and improve the utilization of network resources, these three algorithms achieve a similar effect in improving the performance of network (the difference of algorithms in service blocking rate is no more than0.4%).2. In inter-datacenter Flex-Grid network virtualization scenario, this paper puts forward virtual optical network embedding algorithm based on node classification under the Spectrum Continuity of Virtual Optical Network (SCVON) constraint. The result of simulation shows that the proposed algorithm saves32%substrate network resources, reduces virtual network blocking rate and improves the max virtual network number coexists in substrate network compared with the embedding algorithm based on subgraph isomorphism detection.3. Extend Openflow Protocol according to the property of Flex-Grid network, design and implement the Openflow Switch which can control optical network device, build the experimental platform of Flex-Grid network based on Software Define Network (SDN) to support network virtualization.