1、STD-CEPT ERC REPORT LI-ENGL 111 232b4L4 0035047 C5T ei ERC REPORT 4 7 European Radiocommunications Committee (ERC) i -, _._, z . within the European Conference of Postai and Telecommunications Administrations (CEPT) % DESIGNATION OF A EUROPEAN HARMONISED FREQUENCY BAND FOR MOBILE DIGITAL TRUNKED RAD
2、IO SYSTEMS (MDTRS) Helsinki, June 1991 Reports are being issued from time to time by the European Radiocommunications Cormnittee (ERC) of CEPT to inform industry, operators, users and other interested parties of the work in hand, provisional conclusions and future activities in specific areas of rad
3、io frequency management. Such Reports give more details than is normally possible in a Recommendation and allow an opportunity for comment to be made on the work carried out so far. In most cases, it would be hoped that a fornial CEPT Recommendation could be issued on the subject of the Report in du
4、e course, taking into consideration any comments received on the Report. Reports are formally approved by, and issued in the name of, the Committee itself. In general the detailed preparation of Reports, and further work on the subject, will be done by Working Groups or Project Teams. Thus, any refe
5、rence in the Reports to the ERC should be taken to include the whole framework of the ERC, including its Working Groups, Project Teams, etc. MICHAEL GODDARD Chairman European Radiocommunications Committee (ERC) STD*CEPT ERC REPORT 4-ENGL 1993 232b434 OOLCOLCB 49b Copyright 1991 the European Conferen
6、ce of Postal and Telecommunications Administrations (CEPT) - STD.CEPT ERC REPORT Lt-ENGL 1995 2326454 0035049 322 ERC REPORT 4 Page 1 HARMONISATION OF A EUROPEAN HARMONISED FREQUENCY BAND FOR MOBILE DIGITAL TRUNKED RADIO SYSTEMS (MDTRS) INTRODUCTION User demand for Private Mobile Radio (FMR) has res
7、ulted in its continued expansion in parallel with Public Services, such as GSM. Current PMR services in Europe, including analogue trunking, today total around 4 million vehicle mobile and hand-portable subscriber units and within most CEPT countries are accommodated in a number of separate bands sp
8、read over the VHF and UHF frequency range from 47 MHz - 470 MHz. The tota amount of spectrum varies from country to country and is typically around 50 MHz - 70 MHz. in order to meet this growing requirement for PMR, MDTRS has been conceived and will use digital and Wing technology to enhance the spe
9、ctrum efficiencies and user features compared with the various PMR services in use today. The required spectrum will cater for both voice and data messages and will give the European user the benefit of volume production of identical equipment The frequency requirement for MDTRS for PMR is estimated
10、 by ETSI RES6 as 2 x 20 MHz, preferably below 500 MHZ. An initial 2 x 5 MHz is required by 1995 and the remainder is required from around the year 2000. It is, however, the opinion of CEPT that the total demand of 2 x 20 MHz of additional harmonised unocnipied spectrum cannot be met in the frequency
11、 bands below 500 MHz or even 1 GHz by the years 2000 or 2005 due to the presence of existing systems or systems which are currently being introduced. However, in some countries the possibilities of satisfying these needs are considerably better. Furthermore, it also became apparent that most Adminis
12、trations would be unable to free 2 x 5 MHz of spectrum by 1995. GENERAL APPROACH CEFT agreed on the need to provide frequencies for MTRS and considered all frequency bands which are allocated to the mobile service in the range 47 MHz-2100 MHz. CEPT was of the opinion that in the long term MDTRS requ
13、irements would be accommodated by UMTS. This Report considers the extent to which CEPT could meet the demand of ETSI RES6. BACKGROUND CEPT came to the conclusion that a solution could only be found by providing a frequency band or bands within which the tuning range of the equipment could be develop
14、ed and which could then enable Administrations to designate subbands for MDTRS on a national basis and according to market demand. In some countries certain frequency bands below 400 MHz may in the near future be available. By 1995 only small parts of the frequency band could probably be made availa
15、ble by Administrations but by deciding the duplex separation for the equipment from the outset CEPT believes that this may provide a basis for the gradual introduction of MDTRS by allowing for a later expansion as the spectrum becomes available. It is also essential that the technical characteristic
16、s and frequency allocation for MDTRS are compatible with systems in adjacent channels or bands which means that the relevant CEFT Recommendation T/R 24-01 E has to be fulfilled (adjacent channel selectivity of -76 dB). Although CEPT has in the past indicated preferred frequency bands for digital PMR
17、 systems at 900 MHz (CEPT Recommendation T/R 75-02 E) these are not preferred by ETSI because of propagation constraints and could not be used in some countries before the year 2000 or even longer. However, a significant number of countries did indicate that some spectrum in this band could be made
18、available for MDTRS. ERC REPORT 4 Page 2 Frequency ranges around 400 MHz seem to offer the most realistic chance for meeting most of the operational requirements of MDTRS. Although some Administrations are currently introducing analogue trunked networks in the band 410MHz - 430 MHz and others had mi
19、litary users it was felt that there may be possibilities for local networks to be gradually introduced although sharing conditions would have to be developed. There might then be a gradual move to digital systems according to demand. A few Administrations could provide spectrum for MDTRS in the band
20、 450 MHz - 470 MHZ although most felt that such a designation would be impossible before the year 2000 or even longer due to the large number of users in the band. However, by association with the band 410 MHz - 430 MHz it did give the possibility to introduce MDTRS to those countries not able to fr
21、ee spectrum in the kequency range 410 MHz - 430 MHz and would provide a possibility for some countries to use spectrum in both bands. It would, however, be necessary for ETSI RES6 to design equipment that is capable of operation in both frequency ranges 410 MHz - 430 MHz and 450 MHz - 470 MHz with a
22、 duplex separation of 10 MHz. Still wider ranges of operation, if technically feasible, could facilitate early implementation of digital trunked systems in some countries 4. CONCLUSION CEPT is prepared to designate spectrum for MDTRS in two separate bands, 410 MHz - 430 MHz and 450 MHz - 470 MHz, if
23、 ETSI RES6 can confirm that solutions to the various technical constraints can be found. It is believed that most Administrations would be able to provide some spectnun for MDTRS by 1995 but not of the magnitude of 2 x 5 MHz. It should be recognised that most Administrations would not be able to use the frequency band 450 MHz - 470 MHz for some considerable time while some Administrations would similarly not be able to use the 410 MHz - 430 MHz band. Further contact between ETSI RES6 and the European Radiocommunications Committee is necessary to evaluate this proposal.
