| Summary: | 碩士 === 元智大學 === 資訊工程學系 === 92 === The DWDM (Dense Wavelength Division Multiplex) technique can provide the high speed and high capacity transmission, and the multicast schemes can be efficiently applied in DWDM technique to support QoS guarantees and time-consuming many-to-many transmission services, such as video conference and video broadcasting. We propose a HRWA (Hybrid Routing and Wavelength Assignment) algorithm in optical mesh network with light-tree-based virtual topology. First, the HRWA try to connect all multicast group members with ring path as possible, and then join tree paths are considered when there is no such ring path available. Thereafter, the HRWA will proceed to many-to-many multicast transmission by reserving links and channels, and wavelengths will be assigned by LCC (Least Converter Counts) algorithm. The objective of the proposed HRWA algorithm is to improve system resource utilization, such as increasing the number of many-to-many multicast sessions with less reserved channels and lowering call blocking probability to support more user capacity.
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