Based On The Gmpls Obs Optical Layer Multicast Technology And Research

Recently regarded as a viable switching technology to transport IP traffic directly over WDM networks, Optical Burst Switching (OBS) has received a lot of attentions because it combines the benefits of Optical Circuit Switching (OCS) and Optical Packet Switching (OPS), and overcomes their shortcomings, is more efficient in the bandwidth statistical multiplexing, and the reservation scheme. Meanwhile, multicast (as a group communication scheme from a source to a set of destinations) services are becoming increasingly popular and placing growing demands on bandwidth with the applications such as video-conferencing, video-on-demand services and content distribution. It is more eminent to implement efficient multicast in WDM optical networks. Optical layer multicast is more efficient because first of all it can avoid"electronic bottle-neck"and take full advantage of WDM bandwidth, and can also make optical network to support more multicast applications. Therefore, the research of optical mulaticast in OBS network has been a hotspot.According to the research status of OBS multicast, the following two aspects are the key technology of optical layer multicast and are needed more study: one is the implementation architecture of OBS multicast, the other is construction and maintenance of optical multicast tree. In this paper, both of the two aspects are studied, and new node models supporting OBS multicast are proposed, which are constructed under General Multi-protocol Label Switching (GMPLS) framework. Then based on the models, the function and performance of OBS multicast are simulated. Main contents of this dissertation are listed as follows:1. The switching machanism and network performance of OBS are analyzed deeply. The OBS based on GMPLS framework is investigated in detail, which is take advantage of the idea of LOBS(MPLS-based OBS). Then new functional models of core and edge nodes supporting OBS multicast are proposed, which named as Multicast-aware OBS node models.2. The machanism of proposed models is analyzed in detail, which maps an IP multicast-tree onto a multicast LSP that are connected to form a WDM light-tree. Two...