A robust WiMAX scheduler for EPON-WiMAX networks

The integration of WiMAX networks with EPON networks capitalizes on the large availability of bandwidth in optical access networks with the mobility provided by wireless technologies. In this integration, a WiMAX scheduler needs to take into account the variability of the channel capacity provided by the EPON scheduler. This paper evaluates the performance of the Deficit Based QoS Uplink Scheduler (DBQUS) mechanism, a standard-compliant WiMAX uplink scheduler designed to operate in ONU-BS, under different EPON service cycle durations. The evaluation is conducted using integrated simulators for the WiMAX and for the EPON components. Results show that the proposed scheduler is able to provide QoS to the subscriber stations under different EPON service cycles. As the traffic load increases, the bandwidth received by the BE service flow is reduced due to the service provided to classes of service with higher priority.