Fair Intelligent Congestion Control over DiffServ: A Resource Discovery and Control Scheme for DiffServ

Abstract

Current DiffServ architecture lacks mechanisms for network path discovery with specific service performance. It is recommended in RFC 2990 [I] that an admission control function be defined which can determine whether to admit a service differentiated flow along the nominated network path, This paper proposes Fair Intelligent Congestion Control over DiffServ (FICC-DS) for addressing this issue. The FICC-DS scheme involves a resource discovery (RD) loop, a fair share estimation algorithm. a congestion condition estimation algorithm, and a source admission control algorithm, Simulation results demonstrate that the FICC-DS achieves high network resource utilization and fairness performance than the standard DiffServ. In particular, the FICC-DS virtually eliminates the unfairness properties of TCP traffic class with respect to round trip time (RTT). It also allocates bandwidth fairly between TCP and UDP classes when they share a link over a DiffServ region.