Integrated Bandwidth Allocation and Wavelength Assignment in WDM-PON Networks

WDM-based passive optical network upgrades from traditional single wavelength TDM-PON to satisfy the growing traffic demands in the access network. Various dynamic wavelength and bandwidth allocation algorithms (DWBA) for WDM-PON have been studied. These DWBA algorithms always separate the bandwidth allocation from wavelength assignment. In our previous work , we introduced a SLA (service level agreement) based dynamic resource allocation scheme where ONUs are formed into different groups, and the limited inter-wavelength multiplexing is used. In this article, we present a new algorithm, which relaxes the restriction to further increase the statistical multiplexing opportunities among different ONUs. We also improve early allocation scheme to support the network under heavy load, further improving network utilization. In addition, we enhance excess bandwidth allocation scheme to further improve network performance. We use extensive simulations to compare the proposed algorithm with the algorithms from previous works. The results have shown that the newly-proposed algorithm outperforms the existing algorithms.