Achieving Flow Fairness in DiffServ Class: Per-Flow Fair Admission Control over Differentiated Service Network

Abstract

Differentiated Service Network (DiffServ) provides an architecture that is scalable and capable of differentiating applications' quality of service (QoS). However, it does not take account fairness issues among flows which belong to the same class. This paper suggests a solution to provide some fairness among flows without sacrificing scalability. Our solution involves a Edge-Aware Resource Discovery (RD)feedback loop and Fair Intelligent Admission Control (FIAC) scheme. Per-flow FIAC estimates flow fair share at the edge node and decides to admit or deny individual flow in terms of fairness. Simulation results demonstrate that FIAC over DiffServ is able to prevent uncontrolled UDP traffic from depriving TCP-controlled flows of bandwidth share when they are aggregated to the same class. Furthermore, it also can improve fairness among TCP flows which have different round trip time (R1T). We believe that our solution is scalable and can be deployed immediately.