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From a regulatory point of view there are two types of coordination between administrations: mandatory and voluntary.
Mandatory coordination covers: (a) Coordination of terrestrial services in the frequency bands shared with the space services above 100 MHz under provisions RR9.16, RR9.18 and RR9.19;(b) Obtaining agreement under RR9.21. This is mandatory for those terrestrial services, which are indicated in the Article 5 footnotes making reference to RR9.21;(c) Coordination of stations of non-planned terrestrial services operating in the bands and areas subject to Regional Agreements (e.g. GE85-EMA) vis-à-vis planned services; and(d) Coordination required by some WRC Resolutions (e.g. Resolution 612 (WRC-12)).
Voluntary coordination: direct coordination between administrations concerned without involvement of the Radiocommunication Bureau, e.g. coordination of cellular networks in border areas.
RR9.18 applies to any transmitting station of a terrestrial service in frequency bands above 100 MHz allocated with equal rights to space and terrestrial services within the coordination area of an earth station, in respect of this earth station, with the exception of the coordination under RR9.16 and RR9.19.
RR9.19 applies to any transmitting station of a terrestrial service in a frequency band shared on an equal primary basis with the broadcasting-satellite service, with respect to typical earth stations included in the service area of a space station in the broadcasting-satellite service.
It applies to any station of a service for which the requirement to seek the agreement of other administrations is included in a footnote to the Table of Frequency Allocations referring to RR9.21 (e.g., RR5.316A, RR5.316B, etc.) in respect to all services which have allocations in the concerned frequency band of the same or a higher category of allocation.
