Congestion control in real time applications over Wireless networks

The amount of traffic generated by Real Time Applications has increased substantially over the years. RTA will face congestion where there is any form of bottleneck restricting traffic. This will result in packet loss or delayed traffic which is unacceptable for RTAs. Therefore it is desirable for RTAs to implement congestion control mechanism to improve the stability of networks.

TCP Friendly Rate Control (RFC 3448) is a congestion control algorithm that provides a smooth transmission rate for continuous flow of data is available at sender. So it does not suitable for RTAs where data rate changes abruptly. RFC 5348 works based on variable bit rate for RTAs. TFRC RFC5348 has been proven to be fair when competing with TCP flows over congested links, but it lacks quality-of-service parameters to improve the performance of real-time traffic. In this work we use NS2, the network simulator for simulation of TFRC. TFRC is simulated in wireless environment, limitations are identified and modifications are proposed.