The article analyzes the evaluation of the success of the transmission of audio streams by means of the IEEE 802.11 wireless network. Considered the specifications IEEE 802.11a and IEEE 802.11n. The degree of success is considered to be the efficiency of the system in the process of achieving the goal. The 802.11 standard can provide acceptable quality services for streaming audio. In order to achieve this goal, the characteristics of audio streams transmitted using wireless channels, such parameters of flows and efficiency of the IEEE 802.11 network are analyzed, the characteristics of the network are investigated taking into account the algorithm of its operation. In order to assess the effectiveness of the 802.11 network for the transmission of audiovisual information, it is necessary to determine which transmission characteristics are critical for the provision of relevant information services. The following features of the 802.11 standard, such as n and a, are considered in this article. The research was conducted to work the network in saturated mode.
The study analyzed the case when each wireless station generates a competitive window in the standard scenario using a binary indicator mechanism. That is, after the collision with the transmission of a frame by a certain station, the number of windows of the competition doubles. In general, the wireless channel was seen as a quasi-stationary random process.
In the course of work analyzed the capabilities of wireless networks that operate in accordance with the specification IEEE 802.11a or IEEE 802.11n for voice traffic only for network subscribers. Experiments were performed for various network load values, namely 128 bytes, 256 bytes, and 1500 bytes. The bandwidth of IEEE 802.11a network in the mode of competitive access to the channel, taking into account collisions with the previous survey (RTS / CTS) in the absence of interruptions in the case of application of system speed 24 Mbps, and 54 Mbps and IEEE 802.11n network at system speed 72 Mbps. The paper presents the results of experimental studies.
Evaluating network performance by comparing the audiotransformation parameters generated by G711 and G 729 codecs with IEEE 802.11 wireless network performance at 24 Mbps and 54 Mbps and for IEEE 802.11 wireless network running at system speed 72 Mbps At each stage of the study, an analysis of the success of the transmission of sound streams by means of the network IEEE 802.11 provided different number of active stations, namely: 2, 4, 6, 8, 10, 12, 14. In the article we used the relationships we received in previous works, for Distributed Coordination Function (DCF) mode.
The performance of the network was estimated by comparing the required quality indicators and predicted parameters. The results obtained during the research are presented in the tables and described in detail in the article. Particular attention is paid to the peculiarities of the formation of audio streams using codecs of the most popular formats of audio data.
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Copyright (c) 2019 Інь Ченьлянь, Олександра Олександрівна Омелянець, Володимир Семенович Лозебний (Автор)
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