| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 100 === Optical burst switching (OBS) is a promising switching paradigm that was proposed as a candidate transport solution for next generation optical Internet. Due to the bufferless transmission in OBS, the problem of burst resource contention at core nodes is inescapable, and the unresolved contention leads to burst losses. To prevent from selecting overloaded links and guarantee certain level of QoS, development of efficient routing and wavelength assignment (RWA) algorithms is important for OBS networks. In this thesis, a cross-layer routing and wavelength assignment (CROWN) scheme for OBS mesh networks is proposed. By using the cross-layer communication system, the CROWN scheme has the information of each layers and can determine appropriate route and bandwidth for data bursts. The proposed cross-layer architecture contents several components: physical entities (PE), abstraction entities (AE), cross-layer information provider (CIP), decision database (DDB), and decision engine (DE). In the networks, DE on edge node and core node is performed by the CROWN scheme. The CROWN scheme utilizes the cross-layer information stored in DDB, and the features of different service type traffics to determine the route and wavelength for each data burst. The simulation results show that the CROWN scheme can make better utilization of network resource, decrease the burst loss probability, and increase the system throughput.
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