Congestion Control for Multimedia Flows in Multihop Wireless Networks: Case of Chain Topology

Tremendous efforts have been conferred towards the congestion control concern in mobile wireless networks while dealing with maximizing both throughput and fair bandwidth allocation. Unfortunately, this is made limited by the variable and unpredictable behaviour of such networks. In this paper we propose a new congestion control mechanism for multimedia traffic in mobile wireless networks. Our proposed scheme, called PRDR, uses an explicit rate feedback control drawn by the intermediate routers along a connection path and based on a proportional and derivative controller to compute the supported rate at every router. We explicitly present the router model and propose some improvement to overcome the problem of the unknown capacities of contending multihop links. Moreover, we show through extensive simulations that our proposed scheme insures both robustness and fairness. Moreover, it guarantees the convergence and the stability of the system.