A New Polling Algorithm for Dynamic Data Transmission Sequence of Cluster-based PON

Abstract

Online polling-based passive optical network (PON) effectively reduces the ideal time between two successive time cycles and large grant delay for optical network units (ONUs) than the offline polling-based PON. However, it introduced some other draw backs like unfair bandwidth allocation to the ONUs in different traffic load conditions and absent of priority scheduling to early serve the mostly busy ONUs. In this paper, we propose a new dynamic data transmission sequence algorithm for cluster-based PON that accommodate the advantages of both the existing offline and online polling-based schemes. In the proposed cluster-based PON, in each time cycle, optical line terminal divides all the active ONUs in a number of clusters and unused bandwidth of a cluster is added as a surplus bandwidth to the next cluster. Computer simulated results is obtained in the case of three different performance parameters where the proposed scheme outperforms than the existing offline and online poling-based schemes.