Abstract.It is widely known that network bandwidth is easily monopolized by distributed multimedia applications due to their greedy UDP traffic. In this paper, we propose TCP-friendly MPEG-4 video transfer methods which enable realtime video applications to fairly shares the bandwidth with conventional TCP data applications. We consider how video applications should regulate video quality to adjust video rate to the desired sending rate which is determined by TCP-friendly rate control algorithm. Carelessly applying TCP-friendly rate variation to the video application would seriously degrade the application-level QoS. For example, the control interval should be long enough to avoid the fluctuation of video quality caused by too frequent rate control. However, popular TCP-friendly rate control algorithms recommend that a non-TCP session regulates its sending rate more than once a RTT. Through simulation experiments, it is shown that high-quality and stable video transfer can be accomplished by our proposed methods.
When a considerable amount of UDP traffic is injected into the Internet by distributed multimedia applications, the Internet is easily driven congested. Consequently, bandwidth available to TCP connections is oppressed and their performance significantly deteriorates. In order that both multimedia applications and TCP-based ones fairly co-exist in the Internet, it becomes increasingly important to consider the inter-protocol fairness.In this paper, we propose a video quality adjustment mechanism which accomplishes the high-quality, stable, and TCP-friendly video transfer under a lossy environment in cooperation with the FEC (Forward Error Correction) technique. Our mechanism adjusts the video quality in accordance with the TFRC (TCP-Friendly Rate Control) rate, the packet loss probability, and the resultant video quality. Through simulation experiments, we show that our proposed method can provide high-quality, stable and TCP-friendly video transfer even in the unstable and lossy Internet.
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