Abstract
Dynamic Bandwidth Allocation (DBA) is an important problem for upstream
transmission in Fiber-to-the-Home (FTTH) systems. We propose a generalized
scheduling mechanism for bandwidth allocation with a view to dissolution of
the paradox between efficiency (utilization) and dynamism. Our scheme is shown
to work for both TDM PONs as well as hybrid TDM/WDM PONs and pure WDM PONs
as well as Next Generation PONs (NGPONs). While conventional bandwidth scheduling
schemes pose efficiency as well as fairness issues, our proposed algorithm
overcomes these. Three extensions as part of our scheduling technique include:
1) a <i>K</i>-out-of-<i>N</i> scheme to increase
efficiency, with a general choice of <i>K</i> being a performance driven parameter; 2) strategic scaling to promote
dynamism and reduce bandwidth starvation; and 3) a valuation based strategy
that is uniquely tailored to reflect different service requirements. A thorough
stochastic analysis based on a Markov-model is presented to compute the network-wide
parameters such as delay, optimality and throughput. A detailed simulation
model measures the performance of our scheme for latency, dynamism, efficiency
and blocking comparing the analytical results with other techniques for dynamic
bandwidth allocation in PONs.
© 2011 IEEE
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