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There given to discuss the study results about one of three deployment scenarios performance (in-band deployment mode) of the narrow-band internet of things (NB-IoT) technology. The study is carrying out with help of simulation modeling and experimental testing of the main network parameters, namely: radio coverage, network capacity, user experience, and their dependencies on each other. Comparison of the results of a physical experiment and simulation modeling shows their high convergence and confirms the adequacy of the applied testing methodology. As a case scenario provided an example of NB-IoT implementation on a 4G mobile network in the 800 MHz band, in a suburban area for remote metering applications. The article presents the applying testing methodology of NB-IoT that adapted to the local conditions of radio network planning. Based on the obtained data, adducing the main conclusions about the feasibility of using an in-band scenario for deploying NB-IoT on a 4G network in a suburban environment.

Narrow-band Internet of Things is a new promising radio technology standard that addresses the requirements of the IoT. The technology provides improved indoor coverage, support of massive number of low data rate devices, low delay sensitivity, ultra-low device cost, low device power consumption and optimized network architecture. The technology can be deployed in three different operational modes: (1) in-band, (2) guard-band, or (3) standalone in dedicated spectrum. The choice of NB-IoT deployment scenario has a significant impact on the quality and performance of the network.In this article, presented the results of an experimental study of the performance of all three scenarios for NB-IoT deploying in a real working cellular network under equal operating conditions for consideration. The following parameters chosen as an assessment measure: radio coverage, network capacity and user experience. The research shown that exact the standalone mode provide the best performance for these parameters. In addition, we have confirmed that all three NB-IoT scenarios coexist perfectly on 2G/4G networks and satisfy the original requirements of 3GPP's in deep coverage and robust quality of network service.

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