A novel robust and efficient dynamic bandwidth allocation scheme over a long-reach passive optical network

Long-Reach passive optical networks (LR-PONs) have been considered to be promising solutions for future access networks. In this paper, we proposed a decentralized medium access control (MAC) scheme over an LR-PON network architecture which provides direct inter-ONU communication through an (N+1)×(N+1) star coupler. In the proposed MAC scheme, a profit-weight-based-plus dynamic bandwidth allocation (P-DBA+) scheme is presented. P-DBA+ is a novel excess bandwidth distribution scheme with quality of service (QoS) provisioning. Simulation results indicate that the scheme attains exceptional system performance under various traffic loads and burstiness, providing fair, efficient and robust scheduling, and ensures the QoS requirements.