Direct congestion control scheme (DCCS) for differentiated services IP networks

IETF proposes the differentiated services (DiffServ) architecture to implement QoS in the Internet. However, recent studies have shown that under various conditions, the existing DiffServ mechanism may have problems of unfairness and inefficient resource utilization, thereby failing to achieve the desired QoS for TCP flows running over assured services. This paper considers that the idea of TCP friendly congestion control should be used in traffic conditioning (TC) for AF PHB (assured forwarding per-hop behavior), especially when the customer expects to achieve better performance by out-of-profile traffic. This paper also proposes using a direct congestion control scheme (DCCS) and dynamic traffic conditioning (DTC) to achieve fairness between responsive and unresponsive aggregates as well as better allocations for responsive flows (TCP) with different packet lengths, micro-flow number, round trip time (RTT) etc. Moreover, a better resource utilization can be achieved at the same time