Abstract
Time-division-multiplexed passive optical networks (TDM–PONs)
have been successful solutions for providing the huge bandwidth needed for
quadruple-play services in last-mile networks. In this paper, the effects
of excess bandwidth provisioning applied to a reservation-based TDM are analyzed
in detail, and noble adaptive excess timeslot provisioning (ETP) mechanisms
are proposed in the interoptical network unit (ONU) and intra-ONU domain in
the TDM–PONs. Using traffic load distribution information observed in
an optical line termination (OLT), a proposed deficit reservation-based dynamic
bandwidth allocation, called dr-DBA, controls the amounts of excess timeslot
bandwidths in order to efficiently serve the burst traffic of heavy-loaded
ONUs while guaranteeing strict fair link-sharing. The authors also introduce
a service work-based ETP bandwidth reservation as well as an optimal reservation
class selection mechanism to support prioritized service in an intra-ONU so
that serious node light-load penalty and bandwidth overbooking can be minimized.
The performance results achieved by numerical analysis and simulations prove
that proposed ETP mechanisms provide fair and optimal excess bandwidths to
the ONUs according to the changes in traffic load distribution, while compensating
the systematic weakness of each mechanism in both ONU domains.
© 2009 IEEE
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