Optical network unit (ONU)'s wavelength tuning time is a key factor that cannot be ignored in ONU scheduling algorithm for multi-wavelengths passive optical network (PON). In this paper, we propose an adaptive scheduling algorithm for the coexistence of ONUs with different tuning time in virtual PON, which is called multi-tuning-time ONU scheduling (MOS) algorithm. The simulation shows that the MOS algorithm can effectively avoid the extra queue delay caused by ONUs' wavelength tuning and reduce the waste of bandwidth resources.
In this paper, a load model of ONUs is proposed under the condition of oneto-many mode matching scenario in multi-standard virtual passive optical network. By founding the load model of ONUs, the minimum number of loaded ONUs can be realized to reduce the total wavelength tuning times of MT-ONUs (Mode Transformation ONU). By integrating this model and the optimal combination algorithm, the maximum utilization of the target bandwidth can be carried out. By constructing an establishment and release mechanism of mode matching pairs, frequent switching of working mode of MT-ONUs can be avoided to effectively lift the operating efficiency and the stability of system and further reduce the number of MT-ONUs. Simulations show that when the matching bandwidth ratio is between 0.4 and 1, the utilization of total matching bandwidth is greater than 0.95. Finally, by comparison and analysis, the effectiveness of the proposed model is demonstrated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.