Report ITU-R F.2471-0 (09/2019) Sharing and compatibility studies of HAPSsystems in the fixed service in the21.4-22 GHz frequency range for Region 2
Foreword
Policy on Intellectual Property Right (IPR)
1 Introduction
2 Allocation information in the 21.4-22 GHz frequency range
3 Technical characteristics
     3.1 Technical and operational characteristics of HAPS systems operating in the 21.4-22 GHz frequency range
     3.2 Technical and operational characteristics of fixed service operating in the 21.4-22 GHz frequency range
     3.3 Technical and operational characteristics of Mobile service operating in the 21.4-22 GHz frequency range
     3.4 Technical and operational characteristics of Earth Exploration-Satellite/Space Research (passive) service operating in the adjacent band 21.2-21.4 GHz and near adjacent band 22.21-22.5 GHz
          3.4.1 EESS (passive) characteristics
          3.4.2 Performance and Interference criteria for EESS (passive) systems adjacent to the 21.4-22 GHz frequency band
     3.5 Technical and operational characteristics of Radio Astronomy service operating in the 22.21-22.5 GHz frequency range
          3.5.1 Relevant ITU-R Recommendations and Reports
          3.5.2 Protection criteria
          3.5.3 Percentage of data-loss (Recommendation ITU-R RA.1513)
          3.5.4 Radio astronomy stations operating at 22.21-22.5 GHz in Region 2
     3.6 Propagation models for sharing and compatibility studies in the 21.4-22 GHz frequency range
4 Sharing and compatibility studies
5 Abbreviations and acronyms
Annex 1 (FS)  Sharing and compatibility of fixed service and HAPS systems operating in the 21.4-22 GHz frequency range
1 Technical Analysis
     1.1 Summary
     1.2 Analysis
          1.2.1 Impact from transmitting HAPS into FS receiving stations
               1.2.1.1 Transmitting HAPS impact into FS receiving station: single entry
               1.2.1.2 Aggregate impact from transmitting HAPSs into FS receiving station
          1.2.2 Impact from transmitting FS stations into HAPS receiving ground station and comparison with the FS to FS scenario
               1.2.2.1 Impact from transmitting FS station into HAPS receiving ground station
               1.2.2.2 Impact from transmitting FS station into FS receiving station
               1.2.2.3 Results
2 Summary and analysis of the results of studies
Annex 2 (MS)  Sharing and compatibility of mobile service and HAPS systems operating in the 21.4-22 GHz frequency range
1 Technical analysis
     1.1 Study A
          1.1.1 Introduction
          1.1.2 Technical analysis
               1.1.2.1 Static Analysis
               1.1.2.2 Results of static analysis
               1.1.2.3 Statistical analysis
               1.1.2.4 Results of statistical analysis
               1.1.2.5 Adjacent channel analysis
               1.1.2.6 Results of adjacent channel analysis
          1.1.3 Summary and analysis of the results of study A
     1.2 Study B
          1.2.1 Impact from a single HAPS transmission into AMS receiver
          1.2.2 Impact from a single HAPS ground station transmission into AMS receiver
          1.2.3 Summary and analysis of the results of study B
2 Summary and analysis of the results of studies
Annex 3  (EESS (Passive) in 21.2-21.4 GHz)  Compatibility of Earth exploration-satellite system (passive) in the adjacent band 21.2-21.4 GHz and HAPS systems operating in the 21.4-22 GHz frequency
     1.1 Technical analysis
     1.2 Study A: HAPS to HAPS ground station
          1.2.1 Off-nadir angle
          1.2.2 Maximum system 2 HAPS antenna gain towards EESS satellite (HAPS to GW)
          1.2.3 Maximum system 2 HAPS antenna gain towards EESS satellite (HAPS to CPE)
          1.2.4 Maximum system 2 HAPS station e.i.r.p. density above −4.5  elevation
          1.2.5 Proposed maximum HAPS e.i.r.p. density towards EESS satellite receivers
     1.3 Study B: HAPS ground CPE to HAPS
          1.3.1 Methodology used
          1.3.2 EESS (passive) parameters used
          1.3.3 HAPS parameters used
          1.3.4 Calculation results
          1.3.5 Summary and analysis of the results of study B
     1.4 Study C: HAPS ground GW to HAPS
          1.4.1 Methodology used
          1.4.2 EESS (passive) parameters used
          1.4.3 HAPS parameters used
          1.4.4 Calculation results
          1.4.5 Summary and analysis of the results of study C
2 Summary and analysis of the results of studies
Annex 4  Compatibility of HAPS systems and EESS (passive)  operating in the adjacent band 22.21-22.5 GHz
1 Technical analysis
2 Background
     2.1 Earth exploration-satellite service (passive) protection criteria
     2.2 Description of analysis methodology and simulation parameters
     2.3 Uplink analysis of HAPS System 6 and EESS (passive) sensor
          Analysis of 4 CPE/(100 km × 100 km) and 1 GW/(100 km × 100 km)
          Analysis of 16 CPE/(100 km × 100 km) and 2 GW/(100 km × 100 km)
     2.4 Downlink analysis of HAPS system 6 and EESS (passive)
     2.5 Uplink and downlink analysis results for study A
3 Summary and analysis of the results of studies
     3.1 HAPS station transmitting towards the HAPS GW/CPE stations
     3.2 HAPS GW/CPE stations transmitting towards the HAPS station
Annex 5  Compatibility of Radio Astronomy service in the adjacent band 22.21-22.5 GHz and HAPS systems operating in the 21.4-22 GHz frequency range
1 Technical analysis
     1.1 Study A
          1.1.1 The HAPS system
               1.1.1.1 Out-of-band HAPS transmitter output filter
               1.1.1.2 HAPS transmitter baseband modulation
          1.1.1.3 Adaptive power control
          1.1.2 Analysis
     1.2 Study B
          1.2.1 Introduction
          1.2.2 Background
          1.2.3 Technical characteristics
          1.2.4 Methodology
          1.2.5 Results
               1.2.5.1 HAPS CPE link in the 21.4-22 GHz to RAS in the 22.21-22.5 GHz band
               1.2.5.2 HAPS GW link in the 21.4-22 GHz to RAS in the 22.21-22.5 GHz band
          1.2.6 Summary and analysis of the results
2 Summary and analysis of the results of studies