An Adaptive Rate-Based Congestion Control with Weighted Fairness for Large Round Trip Time Wireless Access Networks

In contrast with wired networks the time varying capacity in a wireless network makes the queue management more complicated than that in the wired ones. Moreover, any bit error in the acknowledgement packet sounds as the packet loss which may be misinterpreted as the congestion occurrence. Th erefore, the window size will be reduced seriously which results in the resource wasting. In addition, large delay which is an ordinary aspect in a wireless network causes instability. On the other hand in a TCP connection the sources with small RTT value allocate the bottleneck link unfairly. Th e main contribution of our study is to design an adaptive robust rate-based queue management (ARRQM) based on the gradient projection internal model control for a large-delay wireless network to avoid the congestion contemporary with weighted fairness, maximum utilization and robustness against packet error rate and fading phenomena. To the authors’ knowledge this is the first time that a queue management is designed for a wireless network with the mentioned advantages, simultaneously. Th e simulation results obtained via NS2 and Simulink confirm the analytical consequences.