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This article provides a survey and a general methodology for coexistence studies between digital terrestrial television (DTT) and mobile broadband (MBB) systems in the ultra high frequency (UHF) broadcasting band. The methodology includes characterization of relevant field measurement scenarios and gives a step-by-step guideline on how to obtain reliable field measurement results to be used in conjunction with link budget analyses, laboratory measurements, and simulations. A survey of potential European coexistence scenarios and regulatory status is given to determine feasible future use scenarios for the UHF television (TV) broadcasting band. The DTT reception system behavior and performance are also described as they greatly affect the amount of spectrum potentially available for MBB use and determine the relevant coexistence field measurement scenarios. Simulation methods used in determining broadcast protection criteria and in coexistence studies are briefly described to demonstrate how the information obtained from field measurements can be used to improve their accuracy. The presented field measurement guidelines can be applied to any DTT-MBB coexistence scenarios and to a wide range of spectrum sharing and cognitive radio system coexistence measurements.

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This paper describes the design of a testbed for experimental validation and trialing of 5G vertical applications. The paper introduces the challenges that 5G aims to solve with regard to the spectrum demand and the convergence of different wireless communication services. The European-level 5G research program 5G Public Private Partnership (5G-PPP) is a coordinated European approach to secure European leadership in 5G. The 5G-PPP has developed a 5G Pan-European Trials Roadmap, which includes a comprehensive strategy for coordinated international preliminary and pre-commercial trials. The objective in designing Turku University of Applied Sciences (TUAS) testbed infrastructure in Turku, Finland, has been in building a testbed that can be used to contribute to the development, standardization and trialing of wireless communications in a diverse selection of scenarios and vertical applications. In addition, the paper describes the spectrum monitoring capabilities at TUAS facilities.

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This paper investigates key stakeholders' incentives for the hybrid use of the Ultra High Frequency (UHF) spectrum for broadcasting and mobile broadband using novel Supplemental Downlink (SDL) Carrier Aggregation (CA) technique from the dynamic capabilities perspective of strategic management. So far broadcaster (BC) community has lacked true incentives for sharing the spectrum they currently use and have seen sharing only as unilateral repurposing act from regulatory bodies and Mobile Network Operators (MNO). In this paper we focus on key stakeholders capability to deal with combined internal and external resources and capabilities in doing business, refered as Dynamic Capability (DC). Spectrum sharing introducing a rapid change in the stakeholders business environments requires dynamic capabilities of hybrid use from both spectrum offering and spectrum utilization perspectives. We focus on identifying and discussing broadcaster incumbents' and MNO licensees' key antecedents, processes, and outcomes related to hybrid use of UHF spectrum using the supplementary downlink (SDL) carrier aggregation (CA) concept. Based on our DC analysis, we found incentives that could motivate both the incumbents and licensees to consider the hybrid use of UHF spectrum as a co-creation opportunity, and provide viewponts for the regulatory bodies to be considered when developing new regulatory models for accessing UHF spectrum.

Private wireless networks have recently gained interest in many business applications. Use of 4G and 5G technologies for private network deployments has become feasible recently. Finnish Transport and Communications Agency Traficom began to grant licenses for private mobile Time Division Duplex (TDD) networks on frequency band 2300-2320 MHz in 2020. In this study, the coexistence of two 4G TDD networks is investigated through an extensive measurement campaign. The laboratory test setup developed to conduct the interference measurement campaign can be used to study 4G and 5G TDD technologies in frequency bands below 4 GHz. Networks using TDD technology are recommended to use synchronized frame configurations to avoid interference. Private network applications and requirements differ between user organisations and hence the uplink and downlink data rate requirements are different and may need different TDD frame configurations. This paper studies interference between adjacent private networks, which have same or different TDD frame configurations. Measurement results indicate that non-synchronized networks produce interference and significant decrease in data throughput in neighboring networks.