Wireless TCP-Friendly Rate Control over the DCCP Transport Protocol

TCP-Friendly Rate control (TFRC) is a Loss based rate control mechanism. It uses TCP equation throughput for calculating the sending rate. This equation is a function of loss event rate. TFRC assumes any lost packet as a signal of network congestion and correspondingly reduces its transmission rate. But in wireless links the packet may be lost by handoffs and error prone wireless links. So there should be a way to distinguish congestion loss from wireless loss for improving performance of TFRC flows in wireless networks. In this paper, we detect real congestion by ECN marking capability of RED routers and we update the new loss interval length for measuring the loss event rate only when we detect real congestion. Simulation results show that our technique effectively alleviates the throughput degradation caused by wireless losses and they show better performance for our proposal. Also our proposal maintains TCP-Friendliness.