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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.
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.
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