Abstract
A heterogeneous, optical/wireless dynamic bandwidth allocation framework is presented, exhibiting
intelligent traffic queuing for practically controlling the quality-of-service (QoS) of mobile traffic, backhauled via
orthogonal frequency division multiple access–PON (OFDMA-PON) networks. A converged data link layer is presented
between long term evolution-advanced (LTE-A) and next-generation passive optical network (NGPON) topologies, extending
beyond NGPON2. This is achieved by incorporating in a new protocol design, consistent mapping of LTE-A QCIs and
OFDMA-PON queues. Novel inter-ONU algorithms have been developed, based on the distribution of weights to allocate
subcarriers to both enhanced node B/optical network units (eNB/ONUs) and residential ONUs, sharing the same
infrastructure. A weighted, intra-ONU scheduling mechanism is also introduced to control further the QoS across the
network load. The inter and intra-ONU algorithms are both dynamic and adaptive, providing customized solutions to
bandwidth allocation for different priority queues at different network traffic loads exhibiting practical fairness in
bandwidth distribution. Therefore, middle and low priority packets are not unjustifiably deprived in favor of high
priority packets at low network traffic loads. In addition the protocol adaptability allows the high priority queues
to automatically over perform when the traffic load has increased and the available bandwidth needs to be rationally
redistributed. Computer simulations have confirmed that following the application of adaptive weights the fairness
index of the new scheme (representing the achieved throughput for each queue), has improved across the traffic load to
above 0.9. Packet delay reduction of more than 40 ms has been recorded as a result for the low priority queues,
while high priorities still achieve sufficiently low packet delays in the range of 20 to 30 ms.
© 2014 IEEE
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