Analysis of the Performance of Cellular Mobile Networks for the Remote-Control Systems of Unmanned Aerial Vehicles. Summary of the Doctoral Thesis

The Thesis is concerned with assessing the suitability of LTE (4G) cellular networks for the remote control of low-flying UAVs. To solve this problem, an approach to the analysis of the delay values in cellular networks has been developed, which makes it possible to estimate the delays of individual cells and overall cellular network. Requirements for delays in the UAV control channel were developed, conclusions were drawn about the suitability of the LTE network as a communication solution for the UAV remote control. A method for calculating the effect of parallel redundancy is proposed, and an experimental assessment of the possibility of using two existing solutions for parallel redundancy in LTE networks is carried out. In addition, a compact technical solution for analyzing the level of base station signals was demonstrated.

Towards a Sustainable City for Cyclists: Promoting Safety through a Mobile Sensing Application

Riding a bicycle is a great manner to contribute to the preservation of our ecosystem. Cycling helps to reduce air pollution and traffic congestion, and so, it is one of the simplest ways to lower the environmental footprint of people. However, the cohabitation of cars and vulnerable road users, such as bikes, scooters, or pedestrians, is prone to cause accidents with serious consequences. In this context, technological solutions are sought that enable the generation of alerts to prevent these accidents, thereby promoting a safer city for these road users, and a cleaner environment. Alert systems based on smartphones can alleviate these situations since nearly all people carry such a device while traveling. In this work, we test the suitability of a smartphone based alert system, determining the most adequate communications architecture. Two protocols have been designed to send position and alert messages to/from a centralized server over 4G cellular networks. One of the protocols is implemented using a REST architecture on top of the HTTP protocol, and the other one is implemented over the UDP protocol. We show that the proposed alarm system is feasible regarding communication response time, and we conclude that the application should be implemented over the UDP protocol, as response times are about three times better than for the REST implementation. We tested the applications in real deployments, finding that drivers are warned of the presence of bicycles when closer than 150 m, having enough time to pay attention to the situation and drive more carefully to avoid a collision.

The millimeter frequency range as a perspective for 5G networks

The currently widely used 4G cellular networks face many challenges. The growing demand for high-resolution mobile multimedia applications is bringing these networks to their practical limits. 5G networks, the next generation of wireless communications, are standardized to ease the burden on current infrastructure by offering significantly higher data rates through increased channel bandwidth. Given the lack of accessible frequencies traditionally used for mobile communications, millimeter bandwidths (mmWave) are quite a challenging alternative. This technology is a cornerstone of upcoming 5G networks, allowing faster data speeds and much higher bandwidth than ever before, but not every 5G network will necessarily use this frequency band, at least not all the time. As with any new technology, there are unavoidable problems that need to be overcome. The purpose of the research and analysis in this article is to systematize issues and solutions related to the potential problems of spectrum sharing in mmWave frequency range, its suitability for long-distance communications, indoors, in bad weather conditions, as well as biological aspects, and relevant conclusions have been done to meet these challenges.

A Research on QoS Optimization in 4G Cellular Networks

cellular system conveys sight and sound website online traffic productively during ongoing transmission. in view that this device transmits blended media information, there may be a prerequisite to adjust the management price as indicated via the gadget situations an excellent manner to hold up fruitful device hobby. in the end, there is a need to allot the assets capably. Nature of provider (QoS) improvement within the sort of system is additionally trying out specially in 4G cellular systems. severa plans were proposed for QoS development in cellular structures which be a part of name Admission control (CAC) and electricity control Scheme. Be that as it is able to, CAC with electricity control isn't always sufficient to offer the most ideal asset use. alongside the ones lines, it is straightforward to build up an powerful QoS primarily based definitely resource Allocation and Scheduling Scheme for normal sight and sound site visitors. The primary objective of proposed studies paintings is to build up a nice of provider based resource Allocation and Adaptive rate Scheduling (QRAAS) plot in cellular systems to improve prepare dependability, boom the framework limit and enhance framework proficiency and therefore to improve best of service in cell systems. To execute the formerly stated QRAAS conspire, resource Allocation based definitely call Admission manage (RACAC) plan and Adaptive price Scheduling (ARS) plot were created.