Investigation of the features of very high-density wireless local area network under high load

DOI: 10.31673/2518-7678.2019.0301930

Abstract

The possibility of taking into account some fundamental reasons affecting the performance of wireless networks with high density under heavy load is considered. It is shown that when building a wireless network with a high density, it is necessary to ensure the proper ratio of signal level to noise level throughout the service area (high signal power), efficient use of air time and sufficient bandwidth to serve a large number of subscribers. It was shown that the size of the collision domain is much larger than the cell size, and therefore the distant subscribers decode the preamble, still designate the channel as busy for the entire frame duration, even if the payload cannot be restored. The use of airtime significantly affects the operation of a wireless network under high load. With the increase in the number of subscribers, the transmission capabilities significantly decrease, since the payload takes less and less airtime to send, and the rest of the airtime is consumed by the overhead of the MAC protocol and framing. Thus, in essence, the channel has to work harder and harder to transmit less and less data..

Key words: Very High Density (VHD), Wireless Local Area Network (WLAN), Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA), Transmit Opportunity (TXOP).

References
1. Олифер В., Олифер Н. Компьютерные сети. Принципы, технологии, протоколы: Учебник для вузов. 5-е изд. — СПб.: Питер, 2016. — 992 с.
2. Смирнова Е.В., Пролетарский А.В. и др. Технологии современных беспроводных сетей Wi-Fi: учебное пособие под общей редакцией А.В. Пролетарского. — Москва : Издательство МГТУ им. Н.Э. Баумана, 2017. — 446 с.
3. Pejman Roshan, Jonathan Leary. 802.11 Wireless Local-Area Network Fundamentals. Publisher: Cisco Press. Pub Date: December 23, 2003. Pages: 312.
4. Викулов А.С., Парамонов А.И. Введение в сети Wi-Fi с высокой плотностью //Информационные технологии и телекоммуникации. 2018. Том 6. № 1. с. 12–20.
5. Викулов А. С., Парамонов А. И. Исследование нагрузки в сети стандарта IEEE 802.11//Информационные технологии и телекоммуникации. 2017. Т. 5. № 4. с. 1–7.
6. Chuck Lukaszewski. Very High Density 802.11ac Networks Validated Reference Design. 1344 CROSSMAN AVENUE, CALIFORNIA. Aruba Networks, Inc., 2015. Pages 110.