| The traffic grooming problem in multi-granularity optical networks and the joint-survivability problem in multi-layer networks are analyzed in this dissertation. Minor-granularity traffics are groomed into major-granularity by properly designed routing scenarios. The ratio of cross-connects between layers is optimized. Introducing traffic grooming can realize the reasonable occupation of network resources by traffics, then the network performance is improved and the QoS of traffics are also improved. Putting the protection and restoration of sub-wavelength, wavelength and waveband together, routing schemes between layers are coordinated. The simulation model of SRLG-disjoint survivability is proposed by utilizing the property information of TE links. Chapter II describes the working mechanism of GMPLS control plan based on traffic engineering and analyzes the layer model of multi-granularity networks. The node structure and its cost model are offered as basis of performance simulation in next chapter. The increase of bandwidth brings the fast increase of cross-connect size in switching nodes in the network, and the cost of node and the complexity of management and control are also increased. Bypass traffics can be switched by establishing a waveband or fiber layer cross-connect when the multi- granularity switching technology is introduced. Therefore, the number of ports in switching nodes and the cost can be greatly decreased. The decrease of node cost is on the cost of losing flexibility. Designing fine RRA algorithms is very important to improve the utilization of network resources. |
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