In this paper, for learn the peculiarities of the distribution of information video streams with 802.11 networks, we studied the peculiarities of different methods of audio-visual content presentation. To analyze the efficiency of using 802.11 networks in the process of audio-visual information transmission, we have found out which features of the transfer process have the greatest impact on the quality of the provision of information services. To obtain these ratings, the characteristics of the streams of audiovisual information transmitted using wireless networks were analyzed, the relationship between the performance of wireless networks IEEE 802.11 and the parameters of the audiovisual stream were analyzed. Requirements for the parameters of the transmission of audio-visual information in IP-networks (jitter, delay, probability of packet loss, connection time, probability of communication breakdown, etc.) are considered. Permissible values of the parameters for the quality of the content where transmitted over the network are selected in accordance with international standards and recommendations. A feature of the study is a network modeled in such a way as to connect with each subscriber - this type of network shows the most accurate picture of the quality of service. During the analysis, the wireless channel modeling was implemented through the ADS software system. Thus, a message bound to the cause of such a lack of behavior, the 802.11 standard can be provided through the service provided by audiovisual streams. Flow characteristics are analyzed for differentiation of characteristics, and they are transmitted using wireless measures, and flow parameters are analyzed using IEEE 802.11 parameters of such flows. During the study, the characteristics of video streams generated by the most popular codecs were analyzed. In order to evaluate the level of video stream parameters, a scenario in which the source generates an SPT (traffic flow of one program) with an intensity of 4 Mbps (load intensity) is considered. The article describes in detail the results of the experimental study of the characteristics of audiovisual traffic. Thus, the data received for the transmission of audiovisual content in real time is transmitted using RTP, UDP, as well as data in the case of transmission and playback of content in a file format using TCP, SMB protocols. It has been found that under ideal conditions, one spatial channel of an IEEE 802.11n wireless network in a mixed mode can provide simultaneous transmission to three video streams with the intensity of 4-5 Mb / s. According to the results of the work, it is clear that the most likely scenario of the transmission of audiovisual information over the 802.11 network is a scenario that uses one spatial channel, due to the presence of only one antenna in subscriber devices. Research is the basis for assessing the effectiveness of determining the priorities of traffic in wireless networks with a large number of users.
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Copyright (c) 2019 Інь Ченьлянь, Омелянець Олександра Олександрівна, Володимир Семенович Лазебний (Автор)
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