METHODS FOR RADIO SPECTRUM EVALUATION AND MONITORING

Abstract

Due to the extensive growth of wireless communications, the usage of radio bands requires a substantial optimized approach and rational treatment. Many new emerged communication scenarios necessitate techniques for optimal spectrum evaluation and monitoring. This paper discusses various such approaches and particularly focuses on spectrum sharing and coexistence presenting several case studies. It offers insights into simulation, modeling and measurement-based methodologies related to spectrum evaluation and utilization, focusing on the effects before and after the digital switchover (DSO) of the TV systems. We investigate the usability of the different propagation models in current wireless systems modeling, including the measurement-based validation of their precision for different scenarios. The article, furthermore, presents laboratory experiments on DVB-T and LTE-800 coexistence. Finally, it discuses a designed example of a nationwide monitoring system for intruder detection, comparing several applied methods and their precision. Key words: radio spectrum; measurement; modeling; LTE; DTV; intruder detection REFERENCES: [1] P. K. Agyapong, et al.: Design considerations for a 5G network architecture, IEEE Communications Magazine, 52, 11, 65–75 (2014). [2] Horizon 2020 Advanced 5G Network Infrastructure for Future Internet PPP – Creating a Smart Network that is Flexible, Robust and Cost Effective,http//ec.europa.eu/di-gital agenda/futurium/en/content/horizon-2020-advanced-5g-network-infrastructure-future-internet-ppp-creating- smart-network, accessed, Oct. 2014. [3] A. Ichkov, V. Atanasovski, L. Gavrilovska: Analysis of Two-Tier LTE Network with Randomized Resource Allocation and Proactive Offloading, Mobile Networks and Applications, 2016, pp. 1–8, DOI: 10.1007/s11036-016-0754-0. [4] ITU World Radiocommunications Conference 2015. http://www.itu.int/en/ITU-R/conferences/wrc/2015/Pages/default.aspx. [5] P. Latkoski,, J. Karamacoski,, L. Gavrilovska,: Availability assessment of TVWS for Wi-Fi-like secondary system: A case study, 7 th International Conference on Cognitive Radio Oriented Wireless Networks – CROWN-COM 2012, Stockholm, Sweden, June 18–20, 2012. [6] Method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3000 MHz, International Telecommunications Commission (ITU), Rec.ITU-R P. 1546–3, 2007. [7] P. Rice, A. Longley, K. Norton, A. Barsis: Transmission Loss Predictions for Tropospheric Communication Circuits, Volume I, National Bureau of Standards, Technical Note, vol. 101, 1967. [8] Bernard Pauchon: Digital Switch Over Experiences across Europe, ITU International Symposium – Digital Switchover, Geneva, June 17 th , 2015. [9] Universal Software Radio Peripheral 2 (USRP2). Information available: http://www.ece.umn.edu/users/ravi0022/class/ee4505/ettus_ds_usrp2_v5.pdf. [10] D. Denkovski, V. Atanasovski, L. Gavrilovska: Practical evaluation of LTE-800 and DVB-T coexistence, IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB), Ghent, Belgium, June 17–19, 2015. [11] OFCOM Technical Report: Technical analysis of interference from mobile network base stations in the 800 MHz band to digital terrestrial television, June, 2011. [12] A. Grambozov, V. Atanasovski, L. Gavrilovska: Practical evaluation of TDoA, AoA and hybrid methods for geolocation of wireless transmitters, IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB), Ghent, Belgium, June 17–19, 2015. [13] http://orca.feit.ukim.edu.mk