1、STD-CEPT CEPT/ERC/REC 12-09-ENGL 1998 m 232b414 0013562 596 = CEPTIERCIREC 12-09 Page 1 Distribution: B CEPT/ERC/RECOMMENDATION 12-09 (The Hague 1998) RADIO FREQUENCY CHANNEL ARRANGEMENT FOR FIXED SERVICE SYSTEMS OPERATING IN THE BAND 57.0 - 59.0 GHz WHICH DO NOT REQUIRE FREQUENCY PLANNING Recommend
2、ation proposed by the Working Group “Spectrum Engineering” (WGSE) Text of the Recommendation adopted by the “European Radiocommunications Committee” (ERC): “The European Conference of Postal and Telecommunications Administrations, considering that CEPT should develop radio frequency channel arrangem
3、ents in consultation with organisations developing standards for radio systems, in order to make the most effective use of the spectrum available; that the propagation characteristics of the 57.0 - 59.0 GHz are ideally suited for use of short range radio links in high density networks; that the high
4、 frequency reuse achievable in the oxygen absorption band reduces the requirement for frequency planning techniques and offers the possibility of deregulated telecommunications environment within CEPT for various low power, low cost and short range radio-relays; that the uses envisaged in this band
5、include digital and analogue systems; that a number of new and existing systems could operate adequately on an unprotected basis in the range of 57.0 - 59.0 GHz, relieving congestion in the lower frequency bands, noting a) that Radio Regulations allocate the band 57.0 - 58.2 GHz on a primary basis f
6、or Earth Exploration Satellite (passive), Fixed, Inter-Satellite, Mobile and Space Research services, and 58.2 - 59.0 GHz on a primary basis for Earth Exploration Satellite (passive), Fixed, Mobile and Space Research (passive) services; b) that in the frequency range of 57.0 - 59.0 GHz oxygen gas ab
7、sorption attenuation is more than 1 O dBkm at sea level; c) that the high attenuation effectively limits the achievable path length and interference level; d) that in the frequency range 57.0 - 59.0 GHz high antenna directivity is achievable even with small size antennas, further reducing the risk o
8、f Co-channel interference; e) that equipment may listen for a free channel before transmission to recognise existing transmissions in order to minimise interference problems and to ensure continued operation of existing transmissions, Edition of8 October 1998 STDOCEPT CEPT/ERC/REC 32-09-ENGL 1998 23
9、26434 0033563 422 CEPTIERCIREC 12-09 Page 2 recommends 1) that the equipment operating in this frequency range should have only minimum restrictions for future technical enhancements, but the necessary requirements to ensure reliable operation; 2) that the CEPT Administrations should follow the reco
10、mmended channel arrangements for the frequency range 57.0 - 59.0 GHz given in Annex A, Table 1 and Table 2; 3) that channels within the frequency ranges 57.0 - 57.100 GHz and 58.900 - 59.0 GHz should not be used for traffic, until satisfactory coexistence studies with Fixed Service in adjacent bands
11、 are completed; these channels could be used for equipment alignment and propagation tests; 4) that the EIRP should be limited to +15 dBW; 5) that the maximum allowable radio frequency tolerance should not exceed k.50 ppm. Edition of 8 October 1998 STD*CEPT CEPT/ERC/REC 22-09-ENGL Lqqfl 2326424 0013
12、564 369 D CEPTIERCIREC 12-09 Page 1 Annex A ANNEX A RADIO-FREQUENCY CHANNEL ARRANGEMENTS IN THE BAND 57.0 - 59.0 GHz Let Sr be the reference frequency of 56 950 MHz, fn be the centre frequency of a radio-frequency channel in the band 57.0 - 59.0 GHz, then the centre frequencies of individual channel
13、s are expressed by the following relationships: a) for systems with a channel separation of i O0 MHz: fn=L+ 100n MHz where: n = 1, 2, 3, . 20 b) for systems with a channel separation of 50 MHz: MHz fn =L+ 25 + 50 n where: n = 1, 2, 3, . 40 Calculated parameters according to ITU-R Rec. 746 TABLE 1 MH
14、z MHz MHz MHz 57025 58975 57050 58950 50 50 XS Separation between centre frequencies of adjacent channels Z1S Separation between the lower band edge and the centre frequency of the first channel Z2S Separation between centre frequencies of the final channel and the upper band edge Edition of 8 October 1998 STD.CEPT CEPT/ERC/REC 12-09-ENGL 1998 2326434 00135b5 2T5 CEPTIERCIREC 12-09 Page 2 Annex A a) 1 O0 MHz channels *) Occupied spectrum: 57 to 59 GHz Band Figure 1 5j.i GHZ 58.9 GHz b) 50 MHz channels 40 x 50 MHz 57 GHz 59 GHz I Channels referred to in recommends 3
