Radio Coverage and Device Capacity Dimensioning Methodologies for IoT LoRaWAN and NB-IoT Deployments in Urban Environments

This paper focuses on the study of IoT network deployments, in both unlicensed and licensed bands, considering LoRaWAN and NB-IoT standards, respectively. The objective is to develop a comprehensive and detailed network planning and coverage dimensioning methodology for assessing key metrics related to the achieved throughput and capacity for specific requirements in order to identify tradeoffs and key issues that are related to the applicability of IoT access technologies for representative use case types. This paper will provide a concise overview of key characteristics of IoT representative IoT access network standards that are considered for being deployed in unlicensed and licensed bands and will present a methodology for modeling the characteristics of both access network technologies in order to assess their coverage and capacity considering different parameters.

SIMULATION OF ULTRA DENSE 5G RADIO ACCESS NETWORKS WITH BEAMFORMING

In this paper, we investigate the connectivity and probability of successful radio reception in the Poisson model of a 5G ultra-dense radio access network formed by devices with the possibility of location aware beamforming. The difference be-tween the proposed model and the existing prototypes is the complex account for the gains of devices, as well as the influence of radio wave propagation losses, slow and fast fading in the radio channel on the performance of the radio access network. The study is carried out for sessions of directional and omni-directional radio communication, and the beamforming mode is based on the preliminary positioning of neighboring devices. Mathematical modeling of a set of simultaneously operating radio lines in the Poisson model of an ultra-dense 5G radio access network makes it possible to estimate the gain in connectivity and the probability of successful radio reception when forming a beam based on preliminary positioning of devices in comparison with the case of omnidirectional antennas. The results of mathematical modeling of a ultra-dense radio access network with devices equipped with six-element circular antenna arrays showed a significant increase in connectivity indicators and the probability of successful radio reception in comparison with the case of omnidirectional antennas and confirmed the possibility of spatial multiplexing of simultaneous transmissions with a territorial separation of devices on 20% of the range of radio coverage based on the signal-to-noise ratio criterion. The result of the study is the establishment of the dependences of the connectivity and the probability of successful radio reception for an ultra-dense 5G radio access network, built on the basis of devices operating in the adaptive diagramming mode, as well as confirmation of the possibilities of spatial multiplexing of simultaneously operating transceiver devices with their territorial separation by 20% of the range of radio coverage based on the signal-to-interference ratio criterion. The obtained dependences of connectivity and the probability of successful radio reception allows to scientifically substantiate construction of an initial approximation of ultra-dense 5G radio access network from devices with the possibility of beamforming based on positioning, taking into account practical recommendations for their territorial diversity with an ultra-dense distribution.

Siberian Radio Communication during the Great Patriotic War

The article examines the technical modernization of Siberian radio communications and broadcasting during the war period. Under the conditions of a large-scale evacuation of industrial facilities and the population to the Siberian region as well as the organization of new telephone and telegraph highways in the eastern direction wire telecommunications worked at the limit of its capabilities and could not cope with the load. In these conditions radio communication was often the only means of communication. Among the evacuated enterprises deployed on the territory of Siberia most of them were the enterprises of the radio industry. One of the main problems faced by the Siberian radio communications, in addition to the shortage of qualified personnel, was the lack of backup equipment, which the front desperately needed. Another difficulty was the restructuring of the radial telecommunication system which entailed the modernization of the transmitters of the main radio communication. In the conditions of an acute shortage of material resources for civil radio communications radio communication activities had to be seriously limited. In general, it was necessary to temporarily abandon the program of continuous radio coverage of the country developed in the pre-war period. First of all, the radio stations were set up at enterprises, city and rural streets and squares, in clubs, libraries, etc. At the same time, as far as possible, the park of radio points was expanded and the operability of radio centers was maintained. Thanks to the mobilization of internal reserves and measures of an administrativerepressive nature in Siberian radio communications it was possible to strengthen the material and technical basis. The industrial production of radio products (mainly for military purposes) was launched in Siberia. However, the quality level of radio communication was low. Since the main efforts were aimed at meeting the needs of the front and the liberated regions the total power of the Siberian radio network has not yet been able to match a large territory of the region and the average power of broadcast transmitters has also remained low. Development of broadcast networks was primarily happened in cities. So, a significant disproportion between the density of radio coverage in urban and rural areas preserved and increased.

Optimizing Radio Coverage Based on Cellular Automata

Autonomous surveillance systems based on wireless sensor networks have brought many benefits for understanding, protecting, and preserving biodiversity thanks to the latest sensor and telecommunication technologies. For example, in archipelagoes with many rocks of various shapes and elevations interleaved with water, it is hard to deploy wireless sensing systems for covering all these given areas. In these sensing systems, coverages are defined as where information is accessible. In this article, a new approach is proposed, adopting cellular automata and massively parallel processing on GPUs. This work relates to the development of parallel algorithms and CAD tools to optimize coverage oriented to efficient deployment of wide-range wireless networks for various purposes such as environmental surveillance, early warning systems for natural hazards and risks, taking into account turbulence in topology. Some experiments on radio coverage were done in different complex terrain areas given positive results in terms of performance and functional requirements.