Redundancy Setting Method for TCP Congestion Control Based on FEC over Wireless LAN

With the rapid increase of mobile device users, the number of streaming services used over wireless LANs has increased. UDP is often used as a transport layer protocol in real-time communication. However, communication using UDP may be rejected by some network devices, thus, the number of streaming services that use TCP has increased. However, for TCP communication, throughput is unstable due to congestion control caused by packet loss. Thus, TCP control to secure a required transmission rate for streaming communications using forward error correction (FEC) technology (TCP-AFEC) has been proposed. TCP-AFEC can control the appropriate transmission rate according to network conditions using a combination of TCP congestion control and FEC. However, TCP-AFEC was not developed for wireless LAN environments, thus, it requires a certain time to set the appropriate redundancy and cannot obtain the required throughput. In this paper, we demonstrate the drawbacks of TCP-AFEC and propose a redundancy setting method that can secure the required throughput. Simulation results indicate that the proposed method can secure more stable throughput than TCP-AFEC.