University of Oulu

M. Palola et al., "Field trial of the 3.5 GHz citizens broadband radio service governed by a spectrum access system (SAS)," 2017 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN), Piscataway, NJ, 2017, pp. 1-9. doi: 10.1109/DySPAN.2017.7920760

Field trial of the 3.5 GHz citizens broadband radio service governed by a spectrum access system (SAS)

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Author: Palola, Marko1; Höyhtyä, Marko1; Aho, Pekka1;
Organizations: 1VTT Technical Research Centre of Finland Ltd, Oulu, Finland
2Centria University of Applied Sciences, Ylivieska, Finland
3Nokia Networks, Oulu, Finland
4Turku University of Applied Sciences, Turku, Finland
5Centre for Wireless Communications, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2017
Publish Date: 2020-03-20


In this paper, we describe a spectrum access system (SAS) based Citizens Broadband Radio Service (CBRS) field trial using a live LTE network in the 3.5 GHz band. The latest WInnForum specification guided the implementation of the relevant protocols for SAS operation. Here, we evaluate the performance of a CBRS field trial by using one of the most important performance indicators in a spectrum sharing scenario — the evacuation time. It indicates how rapidly the secondary user relinquishes the shared spectrum band to the primary user. Following the applied protocols, we measure and analyze the time scales for the evacuation and frequency change procedures in a field trial environment. Our work shows that the set time limits for the protection of primary users against interference are realistic when using commercially available mobile networks and equipment. Finally, utilizing knowledge of the latest base station models, we propose ways to reduce the evacuation and reconfiguration time by up to 70%.

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ISBN Print: 978-1-5090-2830-6
Pages: 1 - 9
DOI: 10.1109/DySPAN.2017.7920760
Host publication: 2017 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)
Conference: IEEE International Symposium on Dynamic Spectrum Access Networks
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The CORE++ research project [4] is funded by the 5thGear program of the Finnish Funding Agency for Technology and Innovation (Tekes) and the project consortium: VTT Technical Research Centre of Finland, University of Oulu, Centria University of Applied Sciences, Fairspectrum, Turku University of Applied Sciences, Nokia, PehuTec, Bittium, KeySight, Finnish Defence Forces. The project is also supported by the Finnish Communications Regulatory Authority.
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