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FORMATION OF EQUIVALENT SIMULATION MODEL OF AN REAL-TIME VIDEO STREAM GENERATOR USED IN PACKET-ORIENTED COMMUNICATION NETWORKS, TAKING INTO ACCOUNT THE STRUCTURE OF THE H.264 COMPRESSION ALGORITHM
Mikhail M. Lukichev, St.Petersburg state transport university of the emperor Alexander I, St.Petersburg, Russia, mixailspbpy@mail.ru
Abstract
At present time, the need for transmitting video traffic in packet-oriented communication networks with a set quality is growing rapidly. If the telecommunication network does not meet the requirements of video devices, then digital distortions and even loss of video frames occur. However, assessing the requirements for communication networks is a complex, multi-criteria task, especially at the stage of network design. The most rational way to assess the behavior of a communication network is to build a simulation model. This model allows you to define the performance indicators of the telecommunications network for each load flow passing through it. Such indicators include: delays, delay deviations, packet loss, and distortion [1]. Delay deviation is one of the most difficult to formalize parameters, but its role in high-quality video image transmission is very important. Accurate definition of the delay deviation, when building simulation models, it is not enough to use the known laws of the distribution of time between IP packets, because this approach does not take into account the structure of the real-time video stream. To solve the problem of accurately building an equivalent real-time video traffic generator, we analyzed the parameters of time intervals between the moments of receiving IP packets received from a network video camera. The analysis showed that the probability density function of the time intervals between neighboring IP packets, in this example, consists of seven independent functions, as well as five additional functions that form the structure of the video stream. Based on the analysis, we constructed an algorithm for the interaction of the considered generators, each of which is based on the unique parameters of various distribution functions, which together form the equivalent real-time video traffic. Also, in the simulation environment, a simulation model is built that has the characteristics of the studied traffic obtained experimentally. The resulting model more accurately displays the structure of video traffic and can be used as a tool for analyzing the properties of a video stream during its aggregation and movement over a telecommunication network. In addition, the approach to the formation of an equivalent network load generator considered in the article can be presented as a methodical for constructing traffic generators from various sources, allowing you the best accuracy at describing the properties of the object under study.
Keywords:telecommunication Networks, the simulation model, probabilistic-temporal characteristics of video traffic, delay time variation, traffic-sniffer, video traffic H.264.
References
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Information about author:
Mikhail M. Lukichev, St.Petersburg state transport university of the emperor Alexander I,
Postgraduate of the department «Electrical Communication», St.Petersburg, Russia