Methodology for Assessing the Level of Operatioal Compatibility between Fixed Wireless Access and Radiolocation Systems When Sharing the Band 3.4-3.7 GHz
The ITU Radiocommunication Assembly,
considering
a) that the frequency band 3 400-3 700 MHz is allocated on a primary basis to the fixed service (FS) and the fixed-satellite service (FSS), amongst other services;
b) that this band, amongst others, is used for terrestrial systems operating in the FS for providing fixed wireless access (FWA) in a variety of situations, and that this use is growing rapidly in many countries, in particular developing
countries;
c) that the characteristics of FWA and radiolocation systems can make compatibility difficult to achieve,
noting
a) that there is interest in harmonizing the use of FWA systems in this band;
b) that, according to RR. No. S5.433, the radiolocation service is also allocated on a primary basis in Regions 2 and 3 and on a secondary basis in Region 1 in the band 3 400-3 700 MHz;
c) that generally FWA applications use multipoint architectures, comprising a multiplicity of base and user terminals over an area;
d) that there is a need to protect co-primary services and to assess further the sharing conditions between FWA
systems and these services;
e) that Recommendation ITU-R M.1461 provides calculation procedures which may be used when performing
sharing studies between FWA and radiolocation systems,
recommends
1 that when performing frequency sharing studies between FWA and radiolocation systems, the methodology
contained in Annex 1 should be considered;
2 that the information gathered from studies performed using this methodology may be applied to determine
whether or not intended FWA operations are sufficiently distant from routine or frequent operating areas of radiolocation
systems, so as to not receive interference, and/or to determine suitable mitigation techniques that could be implemented
(see Note 1);
3 that administrations should make the relevant studies, including those that used other methodologies, available
to the appropriate Radiocommunication Study Groups whenever possible;
4 that sharing criteria needed to ensure compatible operation between FWA and radiolocation systems should be
developed, taking into account available mitigation techniques and the results of assessment methodologies, such as in
Annex 1.
NOTE 1 – Mitigation options for ensuring the compatibility between digital radio-relay systems and radar systems are
given in Recommendation ITU-R F.1097.
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* This Recommendation was jointly developed by experts of Radiocommunication Study Groups 8 and 9, and future revisions
should be undertaken jointly.
** This Recommendation should be brought to the attention of Radiocommunication Study Groups 4 and 8.