1、STD.CEPT CEPT/ERC/REC 12-04 E-ENGL 1996 I 2326434 OCIL4840 5bS CEPTERCIREC i 2-04 E Page 1 Distribution: 6 CEPTIERURECOMMENDATION 12-04 E (Stockholm 1995) HARMONISED RADIO FREQUENCY CHANNEL ARRANGEMENTS FOR DIGITAL TERRESTRIAL FIXED SYSTEMS OPERATING IN THE BAND 48.5 GHz - 51.4 GHz Text of the recom
2、mendation adopted by Working Group “Spectrum Engineering” (WGSE): The European Conference of Post and Telecommunications Administrations, considering 1. that CEPT should develop radio frequency channel arrangements in consultation with organisations developing standards for radio systems, in order t
3、o make the most effective use of the spectrum available, that the propagation characteristics of the band 48.5 GHz - 51.4 GHz are ideaily suited to short range low and medium capacity digital fixed systems, 2. 3. that the anticipated developments in telecommunications networks will require large num
4、bers of short range links in the supporting infrastructure, 4. that any radio frequency channel arrangement should incorporate a provision for the future introduction of improved equipment standards, noting Article 8 of the Radio Regulations allocates the band 48.5 GHz - 50.2 GHz on an quai primary
5、basis to the Fixed, Fixed-Satellite and Mobile services. Sharing criteria between Fixed and Mobile, and Fixed and Fixed-Satellite services may be required, Article 8 of the Radio Regulations allocates the band 50.2 GHz - 50.4 GHz on an equal primary basis to the Fixed, Earth Exploration Satellite (p
6、assive), Mobile and Space Research (passive) services, Sharing criteria between Fixed and Mobile, Pixed and Earth Exploration Satellite (passive), and Fixed and Space Research (passive) services are required, Article 8 of the Radio Regulations allocates the band 50.4 GHz - 51.4 GHz on an equal prima
7、ry basis to the Fixed, Fixed-Satellite and Mobile services, Sharing criteria between Fixed and Mobile, and Fixed and Fixed-Satellite services may be required, Article 8 of the Radio Regulations footnote 904 allocates the band 48.94 GHz - 49.04 GHz to the Radio Astronomy Service on a primary basis fo
8、r spectral line observations. in making assignments to stations of other services in this band, administrations are urged to take all practical steps to protect the Radio Astronomy Service from harmful interference. Co-ordination studies will be required to determine the appropriate method to be use
9、d, In some CEPT countries there are existing fixed systems that operate in bands contained within the band 48.5 GHz - 51.4 GHz on national channel arrangements and are not operating in accordance with the channel arrangements given in the Annex A, In some CEFT countries the band 48.5 GHz - 5 1.4 GHz
10、 is not currently available for the Fixed Service, Edition of August 26,1996 CEPT/ERC/REC 1294 E Page 2 recommends 1) that CEPT Administrations which have the band 48.5 GHz - 51.4 GHz available for the Fixed Service should follow the recommended radio frequency arrangements for the band 48.5 GHz - 5
11、 1.4 GHz given in Annex A, 2) that administrations that have existing systems operating within the band 48.5 GHz - 51.4 GHz may allow these systems to remain until the year 2008 and may determine on a national basis, the degree of protection given. Any intemationai co-ordination that may be required
12、 between existing and new systems shall be in accordance with Article 12 of the Radio Regulations, 3) that CEFT Administrations do not use the sub-band 50.2 GHz - 50.4 GHz as it is not considered possible to share with the proposed EESS.” Edition of August 26,1996 STDOCEPT CEPTIERCIREC 12-04 E-ENGL
13、1996 232b414 0014842 338 CEPTERCIREC 12-04 E Annex A, Page 1 Annex A 1. DERIVATION OF RADIO FREQUENCY CHANNELS The radio frequency channel arrangement for carrier spacings of 28 MHz, 14 MHz, 7 MHz and 3.5 MHz shaii be derived as follows: Let fr fn h be the reference frequency of 49952 MHz (14272 x 3
14、.5 MHz), be the centre frequency (MHz) of the radio-frequency channel in the lower half of the band, be the centre frequency (MHz) of the radio-frequency channel in the upper half of the band, then the frequencies (MHz) of individual channels are expressed by the following relationships: for systems
15、 with a carrier spacing of 28 MHz: lower half of the band fn=fr-l449+28n upper half of the band: fn=fr+21+28n wheren=1,2,3, . 50 for systems with a carrier spacing of 14 MHz: lower half of the band upper half of the band: fn=fr-l442+14n fn=fr+28+14n where n = 1,2, 3, . . . 100 for system with a carr
16、ier spacing of 7 MHz: lower half of the band: fn=fr- 1438.5+7n upper half of the band: fn=fr+31.5+7n wheren=l,2,3, . 200 for system with a carrier spacing of 3.5 MHz: lower half of the band: upper half of the band: fn = fr - 1436.75 + 3.5 n fn=fr+33.25+3.5n where n = 1, 2, 3, . . . 400 Edition of Au
17、gust 26,1996 STD-CEPT CEPT/ERC/REC 12-04 E-ENGL 1996 = 232b414 0014843 274 m 3.5 CEPTIERCIREC 12-04 E Annex A, Page 2 1, . 400 48518.75 49915.25 49988.75 51385.25 18.75 14.75 73.5 1470 Table 1: Calculated parameters according to ITU-R Rec. 746 XS YS Separation between centre frequencies of adjacent
18、channels Separation between centre frequencies of the closest go and return channels Z1S Z2S DS Separation between the lower band edge and the centre frequency of the fist channel Separation between centre frequencies of the finai channel and the upper band edge Duplex spacing (f n - fn) Edition of
19、August 26,1996 STD-CEPT CEPT/ERC/REC 12-04 E-ENGL 1996 232b414 0014844 I100 CEPTERCIREC 12-04 E Annex A, Page 3 Table 2: Occupied spectnun: 48.5 to 5 1.4 GHz Band a) 28 MHz channels (3.5 MHz x 8) Guard band band Guard band 70 MHz I I Guard 13 MHz II b) 14 MHz channels (3.5 MHz x 4) Guard band band 1
20、7 MHz Guard band 70 MHz Guard 13 MHz c) 7 MHZ channels (3.5 MHz x 2) Guard band band 17 MHz Guard band 70 MHz Guard 13 MHz d) 3.5 MHz channels (3.5 MHz x 1) Guard band band 17 MHZ Guard band 70 MHz Guard 13 MHz 48.5 GHz 49.917 GHz 49.987 GHz 51.4 GHz Notes: 1. The sub-band 50.2 - 50.4 GHz is not use
21、d due to the EESS use of this band and its inability to share with the FS. Edition of August 26,1996 STD=CEPT CEPT/ERC/REC 12-04 E-ENGL 1996 232b434 0034845 047 2. 3. The sub-band 48.73 - 48.93 GHz is not used due to the reverse kequencies being used for EESS. The sub-band 48.73 - 48.93 GHz could be used for unidirectional links.
