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Terrestrial Frequently Asked Questions (FAQ): Browse by categories


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What is the purpose of frequency coordination in non-planned bands?

Coordination of frequency assignments is aimed at ensuring implementation of new radiocommunication systems while avoiding harmful interference with the other existing and planned users of other administrations. Coordination may be considered as a means of dynamic planning of the spectrum/orbit resource, allowing more efficient use and without unnecessary freezing of the resource.

What types of coordination do exist?

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.

What does the frequency coordination process consist of in case of mandatory coordination?

Coordination is a bilateral or multilateral process, conducted between administrations, which normally have two main steps:

Step 1: identification of the administrations with which  agreement needs to be obtained, i.e. establishment of coordination requirements. Quite often, for identification of affected administrations standardized methods of calculating interference and some unfavourable assumptions are used due to the absence of precise information on system parameters and terrain;

Step 2: detailed coordination between the administrations concerned. This step allows to take account of real parameters of specific stations, terrain profile and to use the bilaterally agreed protection criteria and calculation methods.

Both steps usually include the exchange of data between concerned administrations within a prescribed period, and publication of the results of the coordination in BRIFIC.