Sharing of inter-satellite link bands around 23, 32.5 and 64.5 GHz between non-geostationary/geostationary inter-satellite links and geostationary/geostationary inter-satellite links
The ITU Radiocommunication Assembly considering a) that inter-satellite links (ISLs) within geostationary (GSO) satellite systems use, or are planned to use, the inter-satellite service (ISS) frequency allocations 22.55-23.55 GHz, 24.45- 24.75 GHz, 32.0-33.0 GHz and 59.3-71.0 GHz; b) that ISLs between GSO and non-GSO satellites use, or are planned to use, the ISS frequency allocations 22.55-23.55 GHz, 24.45-24.75 GHz, 32.0-33.0 GHz and 59.3-71.0 GHz; c) that the ITU-R needs criteria and methods of calculation in order to assess the potential for ISLs of the type mentioned in considering b) to share frequencies with ISLs of the type mentioned in considering a); d) that the criteria and calculation methods mentioned in considering c) could possibly enable the Radiocommunication Bureau (BR) to process notices submitted in accordance with Appendix 4 of the Radio Regulations (RR) for spectrum for ISLs of the type mentioned in considering b); e) that the simulations described in Annex 1 show that instances of significant interference between co-frequency ISLs of the types mentioned in considerings a) and b) occur in only a small proportion of cases, and in those cases for only small percentages of the time; f) that Annex 1 also verifies that the maximum levels of interference occur when the non-GSO/GSO ISL is instantaneously in the Equatorial plane, and that those levels may therefore be calculated manually; g) that considerings e) and f) make it convenient for frequency sharing between the two types of ISL to be facilitated by coordination, and that coordination would not be needed in many cases; h) that the need to coordinate may be checked by calculating the minimum carrier-tointerference, C/I, ratios and comparing them with a simple threshold C/I.