In order to improve the assembly performance of optical burst switching (OBS) network

the assembly modular for the edge node of OBS is studied in this paper and the design scheme of a novel assembly controller (AC) is proposed. By means of introducing the feedback of BDP size

the modular proposed in this paper makes the time-threshold based modular a closed-loop system

which is different from former assembly modules that can be considered as an open-loop system. The novel modular measures the network traffic flow and chooses a suitable timer-threshold for the timer according to the control curve. Moreover

the control curve can be modified according to the BDP size feedback. Simulation results show that the novel modular can improve the distribution of BDP size by 4.95% compared with the time-threshold based modular. In addition

the assembly delay can also be improved by 15％. Therefore

the novel modular not only can adjust the timer threshold according to the traffic flow

but also can control the distribution of Burst size.