A traffic grooming mechanism is proposed based on virtual burst for OBS network(TG-VB).As a multi-granularity dynamic traffic grooming mechanism,TG-VB increases the traffic granularity by "logic-assembly" the normal burst;at the same time,considering the virtual burst′s whole transmitting and whole scheduling,TG-VB chooses a best common transmission routes for the assembling normal burst.The simulation results indicate that comparing with OBS using normal traffic grooming,TG-VB can reduce the co...