1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.205-1-1995-MSW-E.DOC 17.10.03 15.07.10 QUESTION ITU-R 205-1/4 Frequency sharing between non-geostationary satellite feeder links in the fixed-satellite service used by the mobile-satellite service (1993-1995) The ITU Radiocommunication
2、Assembly, considering a) that the World Administrative Radio Conference For Dealing With Frequency Allocations in Certain Parts of the Spectrum (Mlaga-Torremolinos, 1992) (WARC-92) adopted primary mobile-satellite service (MSS) allocations in the 1 to 3 GHz frequency range on a shared primary basis
3、with other radio services subject to coordination in accordance with Resolution 46; b) that there are other MSS allocations; c) that non-geostationary satellite orbit (non-GSO) networks implementing these MSS allocations may use the fixed-satellite service (FSS) allocations for feeder links; d) that
4、 the feeder links for these MSS non-GSO networks are considered part of the FSS; e) that the frequency and technical characteristics of such feeder links for the non-GSO MSS networks may depend on the technical characteristics of such systems using the MSS frequency bands; f) that several of these n
5、on-GSO MSS networks may use the same FSS frequency band for their feeder links; g) that studies of interference mechanisms between non-GSO networks in the respective MSS and the FSS allocated bands have commenced but are not complete; h) that the permissible interference criteria used for geostation
6、ary FSS networks may not be applicable to the FSS feeder links for non-GSO MSS networks, decides that the following Question should be studied 1 What are the updated technical characteristics of the FSS feeder link used by the non-GSO MSS networks? 2 What are the permissible interference criteria be
7、tween FSS feeder links used by the non-GSO MSS networks taking into account the impact on the MSS? 3 What are the other general constraints (including number of networks) under which sharing is feasible between the feeder-links of two or more non-GSO MSS networks? 4 What are the spectrum sharing pos
8、sibilities and technical solutions that are available to permit the sharing of frequencies between FSS feeder links used by non-GSO MSS networks? 5 What are the appropriate coordination methods for sharing between the feeder-links of two or more non-GSO MSS networks? further decides 1 that the results of these studies should lead to the formulation of appropriate Recommendations by 2006. - 2 - 4/1-E C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.205-1-1995-MSW-E.DOC 17.10.03 15.07.10 _
