Экспериментальное исследование автокорреляции и качества обслуживания сетевого трафика

This article presents an experimental assessment of the network traffic autocorrelation impact on the quality of video streaming under controlled load conditions. The experiment involved streaming 720p video content via RTP, RTSP, and UDP protocols over a university local area network, with parallel generation of background HTTP traffic at four distinct intensity levels. The methodology included packet capture followed by the calculation of the general delay, packet loss ratio (according to ITU-T Y.1540), and the autocorrelation function of inter-packet intervals on the client side. The results revealed a consistent relationship between increased network load, a rise in the autocorrelation coefficient, and the degradation of the critical QoS parameters. The highest autocorrelation and the most significant performance deterioration (delay up to 75 ms, packet loss up to 10,4% for UDP) were observed under maximum load, which also led to the emergence of visual artifacts. A comparative analysis has demonstrated that the UDP protocol has the highest sensitivity to autocorrelation and the resulting decline in QoS metrics. The obtained data suggest that autocorrelation in inter-packet arrival times can be considered as a potential negative factor for quality of service. This substantiates the relevance of traffic decorrelation tasks aimed at ensuring stable multimedia transmission within a local area network.