CONTENTS

RECOMMENDATION  ITU-R  P.1410-4     2
Propagation data and prediction methods required for the design of terrestrial broadband radio access systems operating in a frequency range from 3 to 60 GHz     2
Scope     2
Annex 1     2
 1     Introduction  2
 2     Area coverage  3
        2.1     Building blockage  3
                  2.1.1     Ray-tracing requirements  3
                  2.1.2 Dealing with reflections and scattering  4
                  2.1.3      Transmission through buildings  9
                  2.1.4     Statistical model 9
                  2.1.5     Algorithm and computation  11
                  2.1.6     Examples of coverage predictions  13
                  2.1.7     Coverage increase using two or more base stations  14
        2.2 Vegetation attenuation  14
        2.3 Propagation mechanisms case study  15
                  2.3.1 Description of terrain  15
                  2.3.2 Propagation mechanisms modelled  15
                  2.3.3 Coverage with varying propagation mechanisms  16
                  2.3.4 Coverage with varying frequency  16
                  2.3.5 Summary of case study results  18
        2.4 General advice  19
3 Effects of precipitation on availability  19
        3.1 Simultaneous area coverage  19
        3.2 Route diversity improvement 22
4 Propagation channel distortion  25
        4.1 Frequency selective vegetation attenuation  25
        4.2 Multipath from reflections  26
                  4.2.1 Results from ray-tracing  26
                  4.2.2 Results from measurements  27
 5     Interference  29