Report ITU-R RA.2567-0 (03/2026) Methods to address the determination of the coordination area around existing Radio Astronomy Service stations from IMT stations in the frequency band 6 650-6 675.2 MHz
Foreword
Policy on Intellectual Property Right (IPR)
TABLE OF CONTENTS
1 Introduction
2 RAS systems
     2.1 RAS parameters
     2.2 RAS protection criteria
3 IMT systems
4 Propagation model and clutter loss model and polarization loss
     4.1 Basic propagation loss for terrestrial paths
     4.2 Clutter loss
     4.3 Polarization loss
5 Possible scenarios
     5.1 Single entry scenarios
          5.1.1 Generic (flat-terrain) calculation
          5.1.2 Considering terrain, clutter and other constraints
     5.2 Aggregation scenarios
          5.2.1 Generic studies (in absence of terrain profiles and other information)
          5.2.2 Simulation of actual deployments
     5.3 Mixed scenarios
6 Calculation of received power level at RAS receiver and coordination area
7 Summary
Annex 1  An example of calculation of coordination areas
     A1.1 Number of IMT Urban BS at 6 GHz considered in the study
     A1.2 IMT parameters
     A1.3 RAS parameters and protection criteria
     A1.4 Propagation modelling
     A1.5 Results from sharing studies
Annex 2  Example studies for generic and site-specific cases
     A2.1 IMT-2020 parameters
     A2.2 RAS parameters
     A2.3 Simulation methodology of aggregate interference
     A2.4 Propagation model
     A2.5 Generic case study
     A2.6 Sensitivity analysis study
     A2.7 Site specific study
     A2.8 Summary
Annex 3  Proposals on example studies
     A3.1 Introduction
     A3.2 Additional study parameters
          A3.2.1 Base stations
          A3.2.2 User equipment
          A3.2.3 Propagation and clutter models
     A3.3 Generic compatibility studies
          A3.3.1 Worst-case single interferer scenario
          A3.3.2 Aggregated scenario
               A3.3.2.1 Deployment of IMT equipment
               A3.3.2.2 Effective antenna gains and propagation losses
               A3.3.2.3 UE power control
               A3.3.2.4 Integrated power at the RAS receiver
               A3.3.2.5 Summary of aggregation calculations
     A3.4 Site-specific studies
          A3.4.1 Worst-case single interferer scenario
               A3.4.1.1 Study parameters
               A3.4.1.2 Singe-interferer scenario
               A3.4.1.3 Summary
     A3.5 Possible mitigation measures
          A3.5.1 Choice of RAS site and suppression of telescope side lobes
          A3.5.2 IMT site planning
          A3.5.3 AAS, beamforming, and antenna orientation
          A3.5.4 Network management