A Novel Offline-Based DWBA Algorithm with Sorting REPORT for WDM-EPON System

Broadband access networks using passive optical network technology can extend the transmission distance and increase the transmission capacity of carrier networks, but the bandwidth capacity of single channel will be unable to offer the enough demand for the digital life of the future. Therefore, to build the WDM-EPON architecture to satisfy huge bandwidth request is a perfect choice. This paper proposes a WDM-EPON with sort-based dynamic wavelength and bandwidth allocation (Sort-DWBA) algorithm that sorts all REPORT messages by the request length at the next transmission cycle in channel to fully utilize the idle time between cycles as long as at least one ONU requests a long enough transmission window. Alternately, when no grant length is long enough, then some of ONUs requests are laid out together in the idle period to utilize the otherwise wasted idle time. Moreover, the proposed algorithm also includes a queue management scheme which improves efficiency further by decreasing the number of REPORT messages when ONU queues are long. By the simulation results show that Sort-DWBA can significantly improve the network performance in terms of packet delay and throughput, as compared with the well-known online-based DWBA-IPACT and offline-based - DWBA and DWBA2 with fair-excess algorithms.