1、CEPT T/R*25-07*E 91 2326414 0031672 531 TIR 25-07 E Page 1 Recommendation T/R 25-07 E (Lecce 1989, revised in Athens 1990) FREQUENCY COORDINATION FOR THE ECROPEAN RADIO LESSAGE SYSTEM (ERMES) Recommendation proposed by Working Group T WG 19 “Radio Regulatory“ IRR) Text of the Recommendation adopted
2、bj the “Eirropemi Ratiiocomniiitiiciitian.r Cornmittee” f ERC; . “The European Conference of Postal and Telecommunications Administrations. considering a) that the ERMES system being developed by ETSI will require frequency spectrum for the implementation of the system by 1992, and also for the expe
3、cted expansion of the system. b) that the ERMES system will require 1. and. in some countries. probably 3 or 3 channels per countq for the implementation of the system. and further channels as required by the trafic expansion. c) that in border areas, between more than 7 countries. up to 8 channels
4、will probably be required for the implementation of the system, and in the most congested areas the traffic load will probably require up to 16 channels by 1995, d) that the frequency band 169.6-169.8 iMHz has been chosen as the band from which frequencies are selected for the implementation and exp
5、ansion of the system. e) that in congested areas, the frequencies from the band 169.4-169.6 MHz may be assigned in addition to the frequency band 169.6-169.8 MHz. f) that the frequency bands in question are heavily used by other land mobile services in all the CEPT member countries, and in neighbour
6、ing countries outside CEPT. g) that it takes up to 5 years to free frequencies in this frequency area. O noting 1. that the ERMES system will be developed based on frequency agile receivers. and. thus. common European channels are not required for the operation of the system. 2. that in the light of
7、 the high e.r.p. and protection required for the ERMES system compared aith the parameters for other land mobile applications in the same band. use of common channels all oker CEPT would ease the frequency coordination, 3. that if common European frequencies are not used for ERMES in all countries.
8、it is necessary that countries using the common channels. for other land mobile applications. give some degree of protection to the use of the frequencies for ERMES in neighbouring countries. O recommends 1. as from 1.1.1992 the following frequencies are designated as European channels for the ER-ME
9、S system in all CEPT member countries : 169.6 MHz, 169.65 MHz. 169.7 MHz, if these designated channels cannot be used as from the implementation of the ER-MES system in a certain border area, the countries involved shall. in common agreement. make a selection of appropriate channels from the band 16
10、9.4-169.8 MHz. that the remaining channels in the band 169.6-169.8 ,MHz be designated for further expansion of the ER-MES system, if necessary. the use of ERMES stations on both sides of the borders of the countries concerned. on the channels mentioned in recommends 1 to 3. shall be coordinated if t
11、he interfering field strength from the ERMES stations exceeds 30 dBpVjm at the border line. 169.75 MHz, 2. 3. 4. Edition of April 15, 1991 T/R 25-07 E Page 2 CEPT T/R*25-07*E 91 M 232b414 0012673 47tl W 5. that until 1995, in areas where land mobile stations otherthan ERMES stations are used on the
12、frequencies designated for ERMES, the interfering field strength from the ERMES stations in ncighbouring countries shall not exceed 12 dBpV/m at the border line unless otherwise agreed in accordance with recommends 2, that if the frequencies in recommends i arc not used for ERMES, thc interfering fi
13、eld strength from the other land mobile applications shall not exceed 30 dBpV/m at the border line to neighbouring countries, that Administrations may agree, on a bilateral basis, that other channels than those mentioned in recom- mends 1 and 2 be designated for ERMES from the band 160.4-169.8 MHz.
14、Those channels shall be available on the same conditions as mentioned under recommends 1 to 4. that frequencies for the ERMES system from the band 160.4-169.6 are subject to coordination with neighbour- ing countries when the interfering field strength from the ERMES stations exceeds 12 dBpV/m at th
15、e border line, 9. that propagation criteria as described in Annex 2 are used far calculating the interfering field strength, 10. that, in coordinating frequencies for the ERMES system, the twhnical criteria as given in Annex 1 are used, and that the following procedure is applied: 10.1. when request
16、ing coordination the rclevunt characteristics of the base station (see Annex 3) shall be forwarded to the Administration affected, 10.2. the Administration affected shall evaluate the request for coordination and shall within 30 days notify the result of the evaluation to the Administration requesti
17、ng coordination. 10.3. if in the course of the coordination procedure, the Administration affected requires additional information, it may request such information, 10.4. if no reply is received by the Administration requesting coordination within 30 days it may send a reminder to the Administration
18、 affected. An Administration not having responded within 30 days shall be deemed to have given its consent and the frequency may be put into use with characteristics given in the request for coordination, 6. 7. 8. 10.5. the periods mentioned above may be extended by common consent.“ Edition of April
19、 15. 1991 rm 25-07 E Page 3 Annex 1 TECHNICAL PARAMETER FOR COORDINATION OF ERMES STATIONS 1. Carrier spacing: 25 kHz 2. Centre frequency of each channel: 169.425 MHz + n x 25 kHz (n=0,1 , 15) 52 dB (pV/m) (50% of locations. 50% of time)* 3. Minimum field strength to be protected: 4. Protection rati
20、o: 20 dB 5. Propagation curve: see Annex 2 6. Antenna height for receiving stations: 3 m above ground * For a frequency offset between wanted and interfering Signdl the field strength value will be increased according to the table contained in Annex 4. O Edition of April 15, 1991 CEPT T/R*25-07*E 91
21、 M 23iJbq14 0051b75 240 m TIR 25-07 E Page 4 Annex 2 PROPAGATION CRITERIA FQR CALCULATING INTERFACING FIELD STRENGTH Propqcition ciirws The curves attached to this annex should he used to determine the interfering field strength. For special cases including sea path propagation, Administrations may
22、agree upon other curves. Correction Lfac U d 23261134 0031678 TST z c 5 + v) rn 0 I- Lu I- U I U vi a a a s I a O F355 CEPT T/R*25-07*E 95 2326454 005Lb79 9qb W TIR 25-07 E Page a Annex 4 INCREASE OF PERMITTED INTERFERENCE FIELD STRENGTH AT DIFFERING NOMINAL FREQUENCIES, CHANNEL SPACING OF INTERFERING TRANSMITIXR O: 12.5 kHz -I-: 20 kHz *: 25 kHz IN Edition of January 15, 1990
