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A spectrally efficient service apportionment method for sharing and compatibility studies

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Abstract

A key aspect of radio spectrum sharing and compatibility studies is the modelling of interference levels seen by the receivers of one service from the transmitters of another service. In general, calculated interference levels must be below predetermined interference thresholds for sharing or compatibility to be considered feasible. Sometimes, the modelling must take account of interference sourced from services operating in the spectrum but not directly under investigation in the study. This may be done by apportioning the interference thresholds for a particular service between other radio services using, or with potential to use, the spectrum; a method termed service apportionment. Traditionally, equal apportionments for those services with the same regulatory status has been assumed. This is very simple but not necessarily spectrally efficient and may overestimate or underestimate the contribution to aggregate interference. This paper sets out an alternative approach. The apportionment assigned to the emerging IMT service is based on an analysis of the established radio interference environment. Specifically: the aggregate interference sourced from a deployment of fixed service (FS) links incident to a satellite receiver. Our analysis shows that the FS links under-utilise the conventional equal apportionment allowing for an inequality between the service apportionments assigned to IMT and FS and greater potential for a solution to this particular compatibility problem.

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Acknowledgements

This study was sponsored by GSMA in preparation for discussions on sharing and compatibility within the International Telecommunication Union.

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Authors and Affiliations

  1. Transfinite Systems, London, UK

    I. D. Flood & J. R. Parker

  2. GSMA, London, UK

    G. D. Carter

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  1. I. D. Flood
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  2. J. R. Parker
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  3. G. D. Carter
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Correspondence to I. D. Flood.

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Flood, I.D., Parker, J.R. & Carter, G.D. A spectrally efficient service apportionment method for sharing and compatibility studies. Wireless Netw 27, 2383–2390 (2021). https://doi.org/10.1007/s11276-021-02577-3

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