Analysis of EMC problems with the purpose of developing an effective method of WLAN design on the basis of information systems considering electromagnetic

DOI: 10.31673/2412-9070.2020.054047

Abstract

The article analyzes the scope, technologies and principles of wireless local area networks, which allowed to mark the “bottlenecks” of these technologies, which need special attention when designing: the problem of hidden node; mutual interference between neighboring cells (intrasystem EMC); intersystem interference; providing QoS for responsible applications; expansion of wireless local area networks; the impact of network deployment features. The methods used to solve EMC problems in wireless local area networks are shown and their efficiency is analyzed: the mechanism of access to the transmission medium; IEEE 802.11e (QoS) standard; additional standards designed to reduce the impact of interference (802.11 h and k); coding and modulation. It is shown that the accounting of intrasystem and intersystem interference should be carried out in the early stages of design of wireless local area networks. It is shown that the existing mechanisms of access to the transmission medium are designed to organize the conflict-free operation of transceivers within a single access point and are vulnerable to interference created by transmission stations of neighboring access points. The dynamic sensitivity control algorithm is aimed at partially solving this problem, however, the main disadvantage of the DCC algorithm proposed for use in Wi-Fi 6 is that stations located near access points have a higher probability of access to the environment due to a higher signal level. Relative to electromagnetic interference, which leads to a shorter detection range of the carrier. That requires the development of advanced mechanisms to control the sensitivity of the service area of access points.
Based on the analysis, a conclusion is made about the need to develop a methodology for designing wireless local area networks based on information systems, taking into account electromagnetic interference. Which will reduce the time of their design and increase the efficiency of their further operation.

Keywords: Wi-Fi 6; access point; wireless local area networks; QoS; electromagnetic compatibility.

References
1. Wi-Fi 6: The Next Generation of Wireless [Електронний ресурс] // Cisco. URL: https://meraki.cisco.com/lib/pdf/meraki_whitepaper_wifi6.pdf
2. Perahia E., Stacey R. Next Generation Wireless LANs. Cambridge: Cambridge University Press, 2013. 478 p.
3. Wi-Fi certified 6 [Електронний ресурс] // Wi-Fi Alliance. URL: https://wi-fi.org/discover-wi-fi/wi-fi-certified-6
4. Розроблення удосконаленого алгоритму контролю чутливості зони обслуговування точок доступу стандарту IEEE 802.11ax / А. В. Лемешко, А. О. Макаренко, Н. В. Руденко [та ін.] // Зв’язок. 2020. №4. С. 50–56.
5. 802.11v-2011-IEEE Standard for Information technology [Електронний ресурс] // IEEE Xplore. URL: https://ieeexplore.ieee.org/document/8936379
6. M. Shahwaiz Afaqui. Evaluation of dynamic sensitivity control algorithm for IEEE 802.11ax [Електронний ресурс] // IEEE Xplore.
7. Kyu-Haeng Lee. Using OFDMA for MU-MIMO User Selection in 802.11ax-Based Wi-Fi Networks [Електронний ресурс] // IEEE Xplore.
8. A Practical IEEE 802.11ax BSS Color Aware Rate Control Algorithm [Електронний ресурс] // Springer Nature. URL: https://link.springer.com/article/10.1007/s10776-019-00439-6
9. Mangold S. IEEE 802.11k: improving confidence in radio resource measurements [Електронний ресурс] // IEEE Xplore.
10. Nirmala Shenoy. An improved IEEE 802.11 CSMA/CA medium access mechanism through the introduction of random short delays [Електронний ресурс] // IEEE Xplore. URL: https://ieeexplore.ieee.org/document/7151090
11. Wi-Fi Quality of Service Features Enable The Connected World [Електронний ресурс] // Wi-Fi Alliance. URL: https://www.wi-fi.org/news-events/newsroom/backgrounder-wi-fi-quality-of-service-featuresenable-the-connected-world