Centralized control message transmission by using multicast burst polling scheme for QoS in EPONs

Abstract

In this paper, we present a dynamic bandwidth allocation scheme for Ethernet Passive Optical Networks (EPONs). This scheme is based on multicast-burst polling and provides quality of service (QoS) to different classes of packets. It is shown that an interleaved polling scheme severely decreases downstream channel capacity for user traffic when the upstream network load is low (avalanche gate frequency). To overcome this problem, we have proposed a multicast burst polling scheme which shows impressively lower downstream bandwidth consumption compare to IPACT and moreover it did not show the light load penalty problem. Simulation results using OPNET show that the mul-ticast burst polling eliminates light-load penalty and minimizes downstream bandwidth consumption under avalanche gate frequency.