Abstract
In recent years, wireless technologies become more and more important in our daily life. Di erent from IEEE 802.3 wired network, wireless signal is more sensitive with the variation of environment, resulting violent round trip time (RTT) and packet loss rate variation. In this paper, we consider a video streaming over environment with unstable connection quality. In order to improve the throughput and reliability in video streaming, we consider streaming content le delivery and combine Forward Error Correction (FEC) with feedback mechanism. With Application-Layer FEC (AL-FEC), we depart a object (e.g., a le) into many blocks and use encoding/decoding algorithm to repair the lost part of the blocks. Then a feedback mechanism for each block makes the sender knows if the receiver possess enough symbols to decode. We investigate RTT and Iperf throughput between sender and receiver as our basis to determine the quality of connection. To simulate various RTT and bandwidth environments, we connect WiFi APs with Wireless Distribution System (WDS). Because of unstable connection quality, the disconnection handling mechanisms is also a very important issue. In this paper, we propose four Reliable-FLUTE (R-FLUTE) schemes with various ACK channel (TCP or UDP) and sending flow (single fi le or multiple fi les). The experiment result shows that in comparison with FTP, R-FLUTE protocol have 10% to 80% throughput gain in unstable environment cases.