Abstract
Feature
Issue on Optical Access Networks (OAN)
The Ethernet passive optical
network (EPON) is a technology viewed as an attractive solution to the "last mile"
problem. The interleaved polling with adaptive cycle time (IPACT) is a remarkable medium
access control (MAC) protocol for EPONs. The IPACT scheme supports two stages of
scheduling. One is inter-optical network unit (ONU) scheduling. The other is intra-ONU
scheduling. In this paper, we propose a systematic adaptive scheduling scheme to enhance
the functions of the IPACT on both types of scheduling in order to achieve efficient
bandwidth utilization of EPONs under unbalanced traffic and to provide class-of-service
(COS) or differentiated services within an ONU. The simulation results show that our
proposed scheduling scheme can improve the performance of the EPON system under
unbalanced traffic loads and provide fair bandwidth allocation of the uplink to
different types of traffic.
© 2005 Optical Society of America
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