The Research On Contention Resolution Simulative Algorithm Of OBS

Nowadays, the scale of the Internet enlarges rapidly, and the demand for network width has been scaling up to an unbelievable degree. Dramatically increased amount of the World Wide Web users have brought more information servers online. Furthermore, the types of the network services have been largely increased, and the proportion of the multimedia technologies integrated by video and audio becomes larger. All these reasons have made the Internet traffic increase exponential times per year, and the demand for network width and network capacity become more urgent than ever.The deployment of DWDM technology in existing optical transport network meets the bandwidth requirement of Internet traffic. In network switching domain, optical burst switching offers all-optical, high-speed data rate, format transparent switching, which are essential characteristics to support future networks.We deeply research one key technology about OBS: Contention Resolution in Optical Burst Switching Network, for this topic is pivotal to OBS commercial application. Firstly, this thesis made a comprehensive and systematic research on the architecture of optical burst switching. Then, we analyze several data scheduling algorithms. The result of the competition shows FAFA-VF is the best algorithms. In order to improve the performance of the network, an improved wavelength scheduling algorithm is put forward. Then we perform simulation analysis, and the result shows that after adding priority weight to the bursts with more network which they have already reserved resources the burst can rob the wavelength resource reserved for the burst which has smaller priority weight. This wavelength scheduling algorithm can enhance justice of the network effectively. Then we do a deep research about existing contention resolution schemes, and lay out working elements, advantage and disadvantage of these schemes. We introduce the BECN, EWC and scheduling to deflecting routing algorithm to resolve contention resolution. Then we perform simulation analysis; and the result shows that combined schemes can resolve OBS contention, improve the system capability.