1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.231-1995-MSW-E.DOC 17.10.03 15.07.10 QUESTION ITU-R 231/4 Sharing between networks of the fixed-satellite service using non-geostationary satellites and other networks of the fixed-satellite service (1995) The ITU Radiocommunication Ass
2、embly, considering a) that satellite networks involving non-geostationary orbit (GSO) satellites and the associated earth stations may become feasible in the fixed-satellite service (FSS) using the existing frequency allocations with uplinks in the 27.5-29.5 GHz band and downlinks in the 17.7-19.7 G
3、Hz band; b) that current uses of the FSS frequency bands include FSS networks using geostationary satellites, non-geostationary satellite feeder links used by the mobile-satellite service, and broadcasting-satellite service feeder links; c) that the satellite networks in considering a) will introduc
4、e new sharing situations with other FSS systems which have not been fully studied; d) that sharing criteria used for interference between geostationary FSS networks and other FSS systems may not be applicable to the sharing situation referred to in considering c), decides that the following Question
5、 should be studied 1 What are the technical characteristics likely to be used in non-GSO FSS networks? 2 What are the permissible interference criteria (both long term and short term) between non-GSO FSS networks and other FSS uses of the same frequency bands? 3 What are the interference calculation
6、 methods needed to analyse the potential interference between non-GSO FSS networks and other FSS uses of the same frequency bands? 4 What are the spectrum sharing possibilities and technical solutions that are available to permit the sharing of frequencies between non-GSO FSS networks and other FSS uses of the same frequency bands? further decides 1 that the results of these studies should lead to the formulation of appropriate Recommendations by 2006. NOTE 1 See Recommendations ITU-R S.1255, ITU-R S.1257, ITU-R S.1323, ITU-R S.1325 and ITU-R S.1328. _
