The Internet of Things is changing the approach to data transmission and protocol design as well as network services. That is why it is considered to be another technological revolution. The challenge faced by designers of IoT solutions is to determine the scalability of a given technology, with particular emphasis on unlicensed bandwidth (ISM) transmission in highly urbanized areas. Because the construction and implementation of a wireless network for Internet of Things in each of the presented technologies is expensive and time consuming, it must be preceded by an assessment of performance using computer simulations. The literature contains various approaches to modeling the mechanisms of the MAC layer of LoRa technology and implementation in the LoRaWAN network. The article provides an overview of representative LoRa MAC network simulators. It presents and comments the most important research results obtained by the authors of the mentioned simulators.
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