A Fair QoS Architecture

In recent research works an emphasis on DiffServ’s inability to provide preferential treatment and fairness for aggregates of micro flows requiring premium and assured services. Responsive TCP traffic is unable to take advantage of the privileged treatment EF and AF classes provide, when QoS is configured. This is due to the performance degradation of TCP flows when integrated with nonresponsive UDP traffic. UDP flows are more likely to achieve their target rates than TCP flows under traffic congestion. In this paper we propose a design of a fair DiffServ-aware-MPLS TE architecture which protects responsive traffic from non-responsive traffic by assigning different drop precedence of the same EF class to TCP and UDP, and mapping TCP and UDP to different EF class-type queues. We also attempt to improve the fairness and guarantee the privileged treatment for the flows belonging to the assured services.