Fairness Evaluation of a DSCP Based Scheduling Algorithm for Real-Time Traffic in Differentiated Service Networks
Keywords:
FIFO, PQ, WFQ, DSCP, PHB, QoS, differentiated services, OPNETAbstract
It is a very vital factor to allocate the resources for
improving the QoS (Quality of service) for any network
carrying various types of traffic. Real-time applications, such as
video conferences, are in the most important to get the benefit of
QoS adaptation. Several scheduling disciplines are employed at
the router to guarantee the QoS of the network. Each
scheduling discipline has its pros and cons. DiffServ
(Differentiated Services) is an IP based QoS support framework
that differentiates between different classes of traffic. The
function of the core router of the network is to forward packets
as per the per-hop behavior associated with the DSCP
(Differentiated services code point) value.
Weighted Fair Queuing scheduling discipline when merged
with DSCP for traffic classification, maintain fairness of Qos.
The common scheduling mechanisms are first-in-first-out
(FIFO), priority queuing (PQ), and weighted fair queuing
(WFQ). In this paper performance of various scheduling
disciplines for real-time traffic like video was simulated using
OPNET IT Guru, and it was concluded that, WFQ when
merged with DSCP is a better method of queuing.
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