Next-generation passive optical network (PON) has been widely considered as a cost-effective broadband access technology. In this project, we propose a novel sleep time sizing and scheduling framework for the implementation of green bandwidth allocation (GBA) in TDMA-Passive Optical Networks. The proposed framework leverages the batch-mode transmission feature of GBA to minimize the overhead due to frequent Optical Network Unit (ONU) on-off transitions. The optimal sleeping time sequence of each ONU is determined in every cycle without violating the maximum delay requirement. We propose a new sleep time sizing mechanism, namely Sort-And-Shift (SAS), in which the ONUs are sorted according to their expected transmission start times, and their sleep times are shifted to resolve any possible collision while ensuring maximum energy saving. We further decoupled the sleeping time from QoS delay constraints. This implies that sleeping time portion and consequently the energy saving ratio will only depend on the aggregated traffic load. Our solution can adaptively change the data threshold to maintain the required QoS without affecting the energy saving gain.

Funding

KAUST Baseline Funding

Software Packages

• DESEPON v1.0, 2014. Matlab code for computing the excess bandwidth distribution in EPONs

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