Abstract
In Ethernet passive optical networks (EPONs), dynamic bandwidth allocation
(DBA) has to provide efficient and statistical multiplexing between the optical
network units for better upstream use. Here a new burst-polling-based delta (DBA)
scheme is proposed for quality of service (QoS) using class of service (CoS) in
EPONs. The proposed scheme consists of two parts: one is inter-ONU scheduling, which
is a delta DBA based on burst polling, and the other is OLT-based intra-ONU
scheduling, a differentiated priority queuing method at egress, in which three kinds
of traffic classes have been considered, such as expedited forwarding (EF), assured
forwarding (AF), and best effort (BE). With the proposed scheme, it has been shown
that the network resources are optimally utilized and adaptively allocated to the
three traffic classes by guaranteeing the requested QoS. For the verification and
validation of the algorithm, experimental simulation results using OPNET have been
presented, and these show that the proposed scheme under varying offered loads gives
an improvement compared with the other DBA schemes in the content of (criteria)
packet delay, queue length, and channel utilization--especially when the offered
load is beyond the system's capacity. Specifically, packet-delay variations (PDV)
for different classes of traffic are demonstrated.
© 2004 Optical Society of America
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