Abstract
Feature
Issue on Optical Access Networks (OAN)
As an inexpensive,
simple, and scalable solution for broadband access, Ethernet passive optical
networks (EPONs) have the capability of delivering integrated broadband services to
the end users. A critical issue of EPONs is the utility of a shared upstream channel
among the local users, and thus an efficient bandwidth allocation mechanism is
required to facilitate statistical multiplexing among the local network traffic. In
this paper we propose a dynamic bandwidth allocation scheme, i.e., limited sharing
with traffic prediction (LSTP), for upstream channel sharing over EPONs. LSTP
enables dynamic bandwidth negotiation between the optical line terminal (OLT) and
its associated optical network units (ONUs), alleviates data delay by predicting the
traffic arrived during the waiting time and prereserving a portion of bandwidth for
delivery, and avoids the aggressive bandwidth competition by upper bounding the
allocated bandwidth to each ONU. Theoretical analysis and simulation results verify
the feasibility of LSTP by showing that LSTP outperforms other existing schemes with
respect to QoS metrics of data delay and data loss.
© 2005 Optical Society of America
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