earticle

영어

The IP traffic explosion and the bandwidth demands which are in increase growth have all recently led research to the development of new network architectures and protocols. The optical burst switching is then expected to provide a broadband data transport, in both flexible and efficient manners [1]. OBS is a hybrid technique for optical circuit switching and for optical packet switching, combining their advantages by overcoming some of their drawbacks. However, OBS networks still suffer from data loss. These losses are not only due to the fact that two bursts want to take the same wavelength at the same time, or due to the insufficiency of "offset-time" but they are also due to the failure of routing information transmission. A recent variation of OBS models is the optical networks of slotted burst switching, whose smallest unit of data transport is the time interval of the burst. In this paper, we propose a new mechanism of burst construction by comparing the obtained results with the hybrid mechanism based on size and time. The obtained results show that the proposed techniques lead to better performance. Choosing a good number of control channels and data channels also allow reducing the loss rate in such type of networks.