Abstract
Video/Audio packet transport over IP (ver. 4) networks is not guaranteed for real-time communication if network congestion occurs due to excessive traffic load. Congestion avoidance control is thus necessary for real-time video/audio communication over IP networks. An adaptive video bit rate control scheme that detects the onset of congestion is designed to achieve real-time visual communication and efficient data transport. Congestion over a CSMA/CD LAN is detected from the number of retransmissions caused by collisions. The packet delay is used to detect congestion over connected LANs. The effectiveness of the adaptive video bit rate control scheme is verified in experiments that use a number of video/audio communication terminals and data terminals on IP networks. The interaction of the adaptive video bit rate control and TCP congestion control schemes are investigated and suitable bit rate control scheme is discussed. The adaptive bit rate control scheme expands the possibility of visual communication over IP networks.
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