ITU-R M 818-2-2003 Satellite operation within International Mobile Telecommunications-2000 (IMT-2000)《国际移动通信-2000(IMT-2000)内的卫星操作》.pdf
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1、 Rec. ITU-R M.818-2 1 RECOMMENDATION ITU-R M.818-2 Satellite operation within International Mobile Telecommunications-2000 (IMT-2000) (Question ITU-R 229/8) (1992-1994-2003) The ITU Radiocommunication Assembly, considering a) that the ITU-R has been studying International Mobile Telecommunications-2
2、000 (IMT-2000) and has issued Recommendation ITU-R M.687; b) that the ITU-R studies are continuing; c) the need for a flexible system structure able to match investment to the revenue growth, to adapt readily to environmental factors and to respond to new developments without restricting innovation;
3、 d) the relevant ITU-T Recommendations and on-going studies; e) that satellite operation within IMT-2000 will enhance the overall coverage and attractiveness of the services; f) that satellite systems are by nature well suited to provide distribution services mentioned in Recommendation ITU-R M.816;
4、 g) that satellite operation within IMT-2000 could facilitate the development of telecommunication services in developing countries; h) that the technical characteristics of land mobile satellite systems are being studied, and some systems are coming into operation; j) that in order for IMT-2000 to
5、be available to users anywhere on land, ships and aircraft, a satellite component of IMT-2000 will be required; k) that satellite systems using the geostationary orbit or a non-geostationary orbit (e.g. highly inclined elliptical orbit, or low-earth orbit), or combinations thereof, may provide IMT-2
6、000 services; l) that satellite systems (including the satellite component of IMT-2000) could be useful for the provision of services in emergency and disaster relief situations; m) that the World Administrative Radio Conference for Dealing with Frequency Allocations in Certain Parts of the Spectrum
7、 (Mlaga-Torremolinos, 1992) (WARC-92) has identified the bands 1 885-2 025 MHz and 2 110-2 200 MHz as being available on a worldwide basis for use by the terrestrial component of IMT-2000 and that within these bands the portions 1 980-2 010 MHz and 2 170-2 200 MHz as being available on a worldwide b
8、asis for use by the satellite component of IMT-2000; n) that the World Radiocommunication Conference 2000 (Istanbul, 2000) (WRC-2000) has identified, in addition to the frequency bands indicated in considering m), the frequency bands 1 525-1 544 MHz, 1 545-1 559 MHz, 1 610-1 626.5 MHz, 1 626.5-1 645
9、.5 MHz, 1 646.5-1 660.5 MHz, 2 483.5-2 500 MHz, 2 500-2 520 MHz and 2 670-2 690 MHz for possible use by the satellite component of IMT-2000 according to Resolution 225 (WRC-2000); 2 Rec. ITU-R M.818-2 o) that in addition to the use of the bands identified in considering m) and n), above, for the sat
10、ellite component of IMT-2000, the FSS bands may be used for feeder links and other network connections in support of IMT-2000; p) that a pocket-sized IMT-2000 personal station (PS) used for terrestrial communication may also be configured to operate directly with satellites as personal earth station
11、s (PES) or indirectly via a mobile earth station (MES); q) that users may want to be able to use the same terminals and procedures as in the fixed network integrated services digital network (ISDN) to access similar telecommunication services in IMT-2000; r) that particularly for an integrated PES/P
12、S, certain design, operating, and economic advantages may be realized through adoption of features that enable use of the same hardware for the terrestrial and satellite components; s) that the design of the terrestrial component of the IMT-2000 should not be adversely affected by the satellite comp
13、onent; t) that the maximum compatibility of hardware and software between the satellite and terrestrial components of IMT-2000 will benefit the users and facilitate international roaming; u) that the satellite component of IMT-2000 will need to support universal personal telecommunication (UPT); v)
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