Abstract
In this paper, the effects of optical traffic-sharing on the performance
of multicast video delivery in terms of the efficiency of bandwidth allocation
and the fairness of link-sharing are discussed for the downstream direction
of a time-division-multiplexed passive optical network (TDM-PON). We analyze
the practical issues associated with multicast packet switching and transmission
control in a TDM-PON and also propose a fair bandwidth allocation mechanism,
called share-based proportional bandwidth allocation (S-PBA), to effectively
support multicast services. In order to provide an optical network unit with
a fair amount of link bandwidth and high throughput independent of traffic
type, S-PBA arbitrates the amount of unicast timeslot by using effective multicast
traffic share, which is determined based on multicast traffic load distribution
and traffic-sharing density. Analytic and simulation results clearly validate
the effectiveness of the proposed mechanism. This work is applicable to multicast
video delivery or multicast traffic transmission in general, such as voice
traffic, or a combination of both in the case of video conferencing, for example.
© 2008 IEEE
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