1、STD*ITU-R RECMN M*1389-EMGL 1777 9 4855232 0535415 553 W Rec. ITU-R M.1389 1 RECOMMENDATION ITU-R M. 1389 METHODS FOR ACHIEVING COORDINATED USE OF SPECTRUM BY MULTIPLE 1 GHZ AND SHARING WITH OTHER SERVICES IN EXISTING NON-GEOSTATIONARY MOBILE-SATELLITE SERVICE SYSTEMS BELOW MOBILE-SATELLITE SERVICE
2、ALLOCATIONS (Question -R 83/8) (1999) Summary This Recommendation concerns methods for achieving coordinated use of spectrum by multiple non-geostationary mobile-satellite service systems below 1 GHz and sharing with other services in existing mobile-satellite service allocations. A table indicates
3、the techniques to use for narrow band and wideband systems in connection with different services. The IT Radiocommunication Assembly, considering a) that WARC-92, WRC-95 and WRC-97 allocated the bands 137-138 MHz, 148-149.9MHz, 149.9-150.05 MHz (land mobile-satellite service (LMSS) only), 399.9-400.
4、05 MHz (LMSS only), 400.15-401 MHz, 454-455 MHz in certain countries, 455-456 MHz (Region 2 and in certain other countries) and 459-460 MHz (Region 2 and in certain other countries) to the MSS; b) that these allocations are shared by other space and terrestrial services; cl that Resolution 46 (Rev.W
5、RC-97) provides for coordination between these services; d) services, that various techniques have been developed to achieve the coordinated use of these allocations among these noting a) system (MSS) systems be taken into consideration when determining the coordinated use of spectrum, that the aggr
6、egate impact of transmissions from mobile earth station (MES) of multiple mobile satellite recommends 1 below 1 GHz with both space and terrestrial services; that the techniques indicated in Table 1 be used as a guide to the coordinated use of existing MSS allocations COPYRIGHT International Telecom
7、munications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECMN M*13BS-ENGL 1799 M 4855212 053541b 47T Ground level pfd per RR S5.208 1 (Resolution 46 (Rev.WRC-97). A2.1.1.1-3) 2 Rec. ITU-R M.1389 Space operations (137-138 MHz)* Space research Space research (400.15
8、-401 MHz) TABLE i Channel avoidance Combination: - Lowpfd - Cross polarization discrimination Channel avoidance Combination: - Lowpfd - Cross Dolarization discrimination Non-GSO MSS sharing summary Radio astronomy 3xed and mobile 148-149.9 MHz) 455-456 MHz ind 459-460 MHz n Region 2) Filterinflit sh
9、aping Filterinmit shaping 3xed and mobile :137-138 MHz)* :400.15-401 MHz) Narrow-band Combination: - Dynamic channel avoidance - Low duty cycle - Brief message duration - Geographical separation (Rec. -R M.1039) (Rec. ITU-R M.1185) Wideband Combination: - Low output power density - Brief message dur
10、ation - Low data rate - Filtering at satellite - Geographical separation Ground level pfd per RR S5.208 (Resolution 46 (Rev.WRC-97), A2.1.1. i -3) Meteorological iatellites :137-138 MHz)* :400.15-401 MHz) Assignment separation Combination: - Low pfd at ground level - Cross polarization discriminatio
11、n - Adaotive filter at satellite Meteorological aids (400.15-401 MHz) Radionavigation satellite (149.9-150.05 MHz) (399.9-400.05 MHz) Channel avoidance - pfd limit - Channel avoidance - Coordination distance - Antenna elevation limit Combination: - Cross polarization discrimination - LOW pfd Other M
12、SS systems (uplink) - Assignment separation for spread-spectrum systems - Channel avoidance for FDMA systems - Geographic separation - Controlled frequency avoidance - Assignment separation for FDMA systems - Spectrum sharing for other spread spectrum multiple access (SSMA) systems - Controlled freq
13、uency avoidance Other MSS systems (downlink) Other MSS systems (400.15-401 MHz) Combination: - Channel locations - Cross polarization discrimination - Assignment separation Assignment separation Combination: - Low satellite e.i.r.p. density - Cross polarization discrimination - Assignment separation
14、 - CDMA Assignment separation * See Radio Regulations (RR) Article S1. 2 following: that for uplink sharing, between non-GSO MSS and other services the sharing techniques include the - terrestrial services and frequency division multiple access (FDMA) MSS systems - dynamic channel assignment and/or
15、operational constraint on the MES transmissions (see Recommendation IT-R M. 1039); - terrestrial services and code-division multiple access (CDMA) MSS systems - low power density transmissions and/or operational constraints on the MES transmissions; - sharing between MSS systems may require separate
16、 spectrum assignments; COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services STD-ITU-R RECMN M-1389-ENGL 1779 m Li855212 0535417 32b m Rec. ITU-R M.1389 3 that for downlink sharing, principle techniques for sharing are the use of CDMAIFDMA
17、sharing through use of opposite senses of circular polarization is made possible with high axial ratio performance of the spacecraft antennas; pfd threshold to permit necessary coordination; frequency assignment separation; dynamic control of data rate to reduce interference to acceptable levels; th
18、at for uplink sharing between non-GSO, MSS (see RR S5.224A) and RNSS, MES controlled frequency avoidance techniques and coordination distance should be used to avoid transmission on the same frequency during specified periods of time. COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
