Time quantum based online scheduler (TQOS) for WDM EPON

We work to solve the problem of efficient wavelength utilization in WDM EPON. This problem is highlighted because it plays an important role for the up-gradation of WDM EPON implemented in the access. In WDM EPON we have multiple channels available. Channel utilization is dependent on the supportability of the channel by ONUs. Each ONU want to transmit its data to OLT as soon as it is queued at the ONU. This problem is dissolved into two sub-problems. First sub-problem is of Grant Sizing and the other is Grant Scheduling. We explore the sub-problem of Grant Scheduling (when and on which available channel an ONU transmits it data). A scheduler is developed to solve the grant scheduling problem. Our scheduler is hybrid online/offline having the benefits of both online and offline scheduling frameworks. Our scheduler provides efficient wavelength utilization in WDM EPON by reducing average delays involved as compared to the online interval scheduler and online NASC. We conclude by providing some future research guidelines for efficient wavelength utilization in WDM EPON.