A midterm DBA algorithm for quality of service on aggregation layer EPON networks
Photonic Network Communications
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A new burst-polling based delta dynamic bandwidth allocation (DBA) scheme is proposed for quality of services (QoS) using class of services (CoS) in Ethernet passive optical networks (E-PON). The proposed scheme consists of two parts: one is inter scheduling, which is a difference (delta) DBA with burst polling, and the other is intra scheduling, a differentiated priority queuing method at ingress/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 with guaranteeing the requested quality of services. For the verification and validation of the algorithm, the experimental simulation results of OPNET has been presented and these show that the proposed scheme gives an improvement compared with the other DBA schemes in deploying with some criteria: packet delay, queue length and channel utilization, especially when the offered load is beyond the system's capacity.