Wireless Fair Intelligent Congestion Control -- A QoS Performance Evaluation

In WiMAX architecture to avoid congestion at the base station, a mechanism namely WiMAX Fair Intelligent Congestion Control (WFICC) was proposed in [11]. WFICC ensures that the traffic is scheduled in such a way that the base station output buffer operates around a target operating point, without violating the Quality of Service (QoS) requirements of connections. However, only preliminary results were presented in [11]. The aim of this paper is to investigate WFICC thoroughly and evaluate its performance in terms of throughput, delay and jitter for various Class of Services (CoSs) under various parameter settings of the algorithm. A detailed and comprehensive simulation study on various settings of parameters is performed in ns-2. The results show that WFICC performs extremely well in allocating resources fairly among Class of Services (CoSs), yet preserving their QoS requirements. Furthermore, WFICC is robust and easily adapted to various traffic conditions.