Dynamic end-to-end QoS support for video over the Internet

摘要

Streaming video over IP networks has become increasingly popular; however, compared to traditional data traffic, video streaming places different demands on Quality of Service (QoS) in a network, particularly in terms of delay, delay variation, and data loss. In response to the QoS demands of video applications, network techniques have been proposed to provide QoS within a network. Unfortunately, while efficient from a network perspective, most existing solutions have not provided end-to-end QoS that is satisfactory to users. In this paper, packet scheduling and end-to-end QoS distribution schemes are proposed to address this issue. The packet scheduling at routers consider the correlation between video characteristics, available local resources and the resulting visual quality. While the QoS distribution scheme performs inter-node adaptation, dynamically adjusting local loss constraints in response to network conditions in order to keep an end-to-end loss requirement. Experiments results show that using QoS distribution and packet scheduling together increases the probability of meeting end-to-end QoS requirements of networked video.