In the current broadband access networks, Gigabit Ethernet passive optical networks (GE-PON) have emerged as
a promising candidate for next-generation broadband access networks. As this technology evolves, the
development of efficient dynamic bandwidth allocation (DBA) algorithms has become a key concern.
Bandwidth allocation based on the TDM mechanism has been discussed to a great deal. And the dynamics of
network load has been detected by the network designers and researchers, thus, different kinds of resource
distribution schemes are deployed in the broadband passive optical network (PON). Resources schemes are
mainly designed to fulfill the task of allocate the bandwidth according to the requirements from the end-users,
concerning the priority of service and traffic-load. However, the total dynamics of traffic-load's priority can't be
determined precisely and there need to be a dynamic priority group based scheduling. This paper proposes a
novel dynamic bandwidth allocation scheme that exploits diff-group to implement the timeslot assignment
among ONUs with two-stage priority queuing to yield a globally optimized QoS control.
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