University of Oulu

Heikkilä, M, Koskela, P, Suomalainen, J, et al. Field trial with tactical bubbles for mission critical communications. Trans Emerging Tel Tech. 2022; 33( 1):e4385. doi:10.1002/ett.4385

Field trial with tactical bubbles for mission critical communications

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Author: Heikkilä, Marjo1; Koskela, Pekka2; Suomalainen, Jani2;
Organizations: 1Centria University of Applied Sciences, Ylivieska, Finland
2VTT Technical Research Centre of Finland, Espoo, Finland
3Centre for Wireless Communications, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.3 MB)
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Language: English
Published: John Wiley & Sons, 2022
Publish Date: 2022-03-08


Main research and development interest of 5G and beyond systems are focusing on solution for populated and hot spot areas, but public safety authorities need reliable communication solutions in rural and remote areas. Tactical bubbles—ad hoc-type nonpublic communications networks built with the 3rd Generation Partnership Project-based mobile technologies—offer mission critical communications services for public safety authorities in areas with bad mobile network coverage while also providing additional capacity in hot spot areas. In this experimental study, three interconnected bubbles acting on three different frequency bands—2.3 GHz (40), 2.6 GHz (7), and 3.5 GHz (n78)—are trialed. This article provides the analysis of different factors related to performance and user experience of tactical bubbles. Both ground-level and aerial trial measurements, as well as simulations, were utilized to verify our configuration for the tactical bubbles and their fulfillment of the quality requirements. The performance and coverage of the tactical bubbles are evaluated in a trial, which represents authorities’ search operations in a rural environment with hills, forests, and swamps. The achieved coverage range of the bubbles is more than 1000 m with the unmanned aerial system-based measurements, whereas by car, the coverage is less than 600 m. The effect of obstacles (ie, buildings and hills) on the coverage area and performance of bubbles is significant, especially on car-based measurements on the ground level.

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Series: Transactions on emerging telecommunications technologies
ISSN: 2161-5748
ISSN-E: 2161-3915
ISSN-L: 2161-5748
Volume: 33
Issue: 1
Article number: e4385
DOI: 10.1002/ett.4385
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the Business Finland and the consortium partners of the PRIORITY project.
Copyright information: © 2021 The Authors. Transactions on Emerging Telecommunications Technologies published by John Wiley & Sons, Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.