ITU-R F 1249-5-2018 Technical and operational requirements that facilitate sharing between point-to-point systems in the fixed service and the inter-satellite service in the band 2.pdf
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1、 Recommendation ITU-R F.1249-5 (01/2018) Technical and operational requirements that facilitate sharing between point-to-point systems in the fixed service and the inter-satellite service in the band 25.25-27.5 GHz F Series Fixed service ii Rec. ITU-R F.1249-5 Foreword The role of the Radiocommunica
2、tion Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory an
3、d policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R
4、/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO
5、/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT B
6、roadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fix
7、ed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Public
8、ation Geneva, 2018 ITU 2018 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.1249-5 1 RECOMMENDATION ITU-R F.1249-5* Technical and operational requirements that facilitate sharing between point-to-point syste
9、ms in the fixed service and the inter-satellite service in the band 25.25-27.5 GHz (Question ITU-R 118/7) (1997-2000-2009-2013-2015-2018) Scope This Recommendation provides maximum e.i.r.p. density of transmitting point-to-point fixed service (FS) stations towards the direction of the geostationary-
10、satellite orbit to enable sharing with the inter-satellite service in the band 25.25-27.5 GHz. The reference e.i.r.p. density in this Recommendation takes into account the need for transmission at the minimum necessary level while taking into account use of automatic transmitter power control (ATPC)
11、 at the FS stations for precipitation events. Keywords Data relay satellites, orbital locations, e.i.r.p., spectral density Abbreviations ATPC Automatic transmitter power control DRS Data relay satellite e.i.r.p. equivalent isotropically radiated power FS Fixed service GSO Geostationary-satellite or
12、bit Related ITU Recommendations and Reports Recommendation ITU-R F.758 System parameters and considerations in the development of criteria for sharing or compatibility between digital fixed wireless systems in the fixed service and systems in other services and other sources of interference Recommen
13、dation ITU-R F.1333 Estimation of the actual elevation angle from a station in the fixed service towards a space station taking into account atmospheric refraction Recommendation ITU-R F.1404 Minimum propagation attenuation due to atmospheric gases for use in frequency sharing studies between system
14、s in the fixed service and systems in the broadcasting-satellite, mobile-satellite and space science services Recommendation ITU-R F.1509 Technical and operational requirements that facilitate sharing between point-to-multipoint systems in the fixed service and the inter-satellite service in the ban
15、d 25.25-27.5 GHz * This Recommendation was jointly developed by Radiocommunication Study Groups 7 and 5, and future revisions should be undertaken jointly. 2 Rec. ITU-R F.1249-5 Recommendation ITU-R P.526 Propagation by diffraction Recommendation ITU-R P.676 Attenuation by atmospheric gases Recommen
16、dation ITU-R SA.1155 Protection criteria related to the operation of data relay satellite systems Recommendation ITU-R SA.1276 Orbital locations of data relay satellites to be protected from the emissions of fixed service systems operating in the band 25.25-27.5 GHz Recommendation ITU-R SF.765 Inter
17、section of radio-relay antenna beams with orbits used by space stations in the fixed-satellite service The ITU Radiocommunication Assembly, considering a) that the frequency band 25.25-27.5 GHz is allocated to the inter-satellite service and the fixed service on a primary basis; b) that this frequen
18、cy band is used for space research and Earth exploration applications for return inter-satellite links to data relay satellites (DRSs) in the geostationary-satellite orbit (GSO); c) that some transmitting stations in the fixed service (FS) may be able to use automatic transmit-power control (ATPC) t
19、o reduce their equivalent isotropically radiated power (e.i.r.p.) during clear-weather conditions; d) that aggregate interference from the side lobes of the antennas of a large number of transmitting stations in the FS which do not point towards a DRS has been shown to be tolerable, but that main be
20、am coupling from a single transmitting station in the FS service which does point towards a DRS is considered to represent a potentially severe interference situation (see Annex 1); e) that, whereas exceptionally long FS links require operation at elevated e.i.r.p. densities, these usually operate n
21、ear or at zero elevation angles where atmospheric attenuation substantially reduces the potential interference; f) that, under certain circumstances, topography and man-made structures obstruct FS radiation into space, or introduce substantial attenuation into the potential interference path; g) tha
22、t interference mitigation techniques can be used by both services to minimize the interference from the emissions of FS systems into DRS systems, recognizing a) that Recommendation ITU-R SA.1155 recommends that the maximum aggregate interference power spectral density levels received in the 25.25-27
23、.5 GHz band by geostationary DRSs in the inter-satellite service should not exceed 178 dB(W/kHz) for more than 0.1% of the time; b) that a limited number of DRS networks are used in the GSO as listed in Recommendation ITU-R SA.1276 (see Note 1); c) that Recommendation ITU-R F.758 provides a large va
24、riety of fixed wireless system parameters generalized by representative systems for specific frequency ranges, Rec. ITU-R F.1249-5 3 recommends 1 that the maximum e.i.r.p. within the channel bandwidth of such an FS station should, where practicable, be the lowest necessary for satisfactory operation
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