Bandwidth allocation based on priority and excess-bandwidth-utilized algorithm in WDM/TDM PON

WDM/TDM passive optical network (PON) is being viewed as a promising solution for delivering multiple services and applications, such as high-definition video, video conference and data traffic. This paper introduces a novel bandwidth allocation scheme to efficiently utilize the bandwidth and support QoS (Quality of Service) guarantees in WDM/TDM PON. We develop the priority-based transmission windows and investigate the fair bandwidth allocation by using linearly proportional algorithm. Specially, the proposed scheme can increase the bandwidth-utilized rate (BUR) by collecting and allocating the excess bandwidths from both light-loaded ONUs (time domain) and wavelength domain. Besides, the performance of delay-sensitive services is greatly improved without degrading QoS guarantees for other services due to our priority-based scheme. Finally, we conduct detailed simulation experiments to research the performance and demonstrate the effectiveness of the proposed scheme.