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In this paper, we propose and evaluate the optical time-slot switching (OTS) technology, in which the fixed size time-slot is adopted as the basic switching granularity, and switching is done in the time domain, rather than wavelength domain. Subsequently, the routing, wavelength and time-slot assignment (RWTA) problem is studied. An adaptive weight function is introduced to the routing and wavelength selection algorithm, and several useful approaches, such as the train approach, wagon approach and p-distribution approach, are presented for the time-slot assignment and scheduling. The results show that our scheme can perform better than conventional OBS in the aspect of blocking performance, quality of service and class of service.