Research On The Traffic Engineering Algorithm Based On QoS Routing In OBS Network

Though the development of DWDM technology has offered enormous bandwidth resources for the explosive growth of data service, the multi-layer network structure and the independent control mechanism cannot meet the demand for speed and capacity. With the research and development of OADM, dynamical distribution of bandwidth in optical network has realized to some extent, however, mixing and multiplexing of each network layer which needs unnecessary photo-electricity conversion increased the cost and the complexity of the operation. So, from the long-term point of view, in order to meet the demand for switching speed of the data service, IP over WDM is imperative.In recent years, OBS has been considered to be a promising switching paradigm which aspires to provide a flexible infrastructure for carrying future Internet traffic in an effective yet practical manner. OBS separates the control and data plane functions in the network in a way that exploits the distinct advantages of optical and electronic technologies. Signaling messages are processed electronically at every node in the network, while bursts are transmitted transparently end-to-end, without OEO conversion at intermediate nodes. Moreover, OBS transport is positioned between wavelength routing and optical packet switching. All-optical circuits tend to be inefficient for traffic that has not been groomed or statistically multiplexed, whereas optical packet switching requires practical, cost-effective, and scalable implementations of optical buffering and optical header processing, which are several years away. In one word, the main advantages of OBS are dynamic, flexible, oriented-connectionless, transparent wavelength bandwidth provision on demand.