Abstract
At present, there is an exponential increase in the total data traffic of mobile networks. Implementation of new technologies, implementation of innovative infrastructure solutions, as well as optimization and increase of efficiency of use of existing networks are necessary to prevent failures and congestion. The most promising way, from a mobile operator's perspective, is to develop a macro level and use Wi-Fi to offload LTE-A (Wi-Fi Offloading). However, the efficiency of the conflict resolution algorithms used in modern Wi-Fi systems is significantly reduced with increasing number of subscribers. Features of the family of the latest Wi-Fi standards (IEEE 802.11n, IEEE 802.11ac, IEEE 802.11ax), which are intended for unloading mobile networks and quality provision of Internet of Things, are considered in the article. A review and comparison of the protocols of the latest IEEE 802.11 standards showed that, technically, Wi-Fi 6 has a data rate that is 37% faster than 802.11ac, but more importantly, the updated specification offers 4 times more bandwidth per user in crowded places, as well as higher energy efficiency, which should increase the battery life of the devices. To achieve these improvements, 802.11ax has made many changes, including several multi-user technologies borrowed from the cellular industry, namely MU-MIMO and OFDMA technologies, which greatly increase bandwidth and productivity through more concurrent connections and more careful use of the spectrum. The results of simulation modeling of the delay in packet transmission, average access point bandwidth and data loss values using different modes of collective access to the IEEE 802.11n network channels: distributed (DCF) and centralized (PCF) access coordination functions. OPNET Modeler, which is radio-oriented and allows you to build models without programming, has been selected to develop the network simulation model.
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