Abstract
Dynamic Bandwidth Allocation (DBA) is a major research challenge in
the migration of Passive Optical Networks (PON) systems towards Long Reach
PON, especially when hybrid WDM/TDM is used (LR WDM/TDM PON). New solutions
for Dynamic Bandwidth and Wavelength Assignment (DBWA) are sought to address
two main critical issues of such PON systems: how to schedule the transmissions
over multiple wavelengths and how to efficiently exploit the bandwidth in
presence of long propagation delays of long reach scenarios. In this work,
for the first time, we investigate the Multi-thread polling in a LR WDM/TDM
PON. Then, we propose a new DBWA scheme, called EFT-partial-VF Multi-threaded,
which effectively combines some of the features of, the Earliest Finish Time
with Void Filling (EFT-VF) algorithm, with the Multi-thread algorithm. The
two proposed solutions, namely the MT algorithm and the EFT-partial-VF Multi-threaded
algorithm, provide significant improvement in terms of average delay, if compared
with existing algorithms such as the EFT and the EFT-VF. Besides this, we
extend the definition of polling cycle to hybrid WDM/TDM PON and we provide
a method to calculate it.
© 2013 IEEE
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