1、 STD-CEPT ERC REPORT 79-ENGL 2000 II 232b4L4 OOLb8L4 258 ERC REPORT 79 European Radiocommunications Committee (ERC) within the European Conference of Postal and Telecommunications Administrations (CEPT) IMPLEMENTATION OF THE CHESTER AGREEMENT Naples, January 2000 STD=CEPT ERC REPORT 79-ENGL 2000 W 2
2、32b414 00LbB15 194 ERC REPORT 79 Copyright 2OW the European Conference of Postal and Teiecummutiicatioiis Administrations (CEPT) STD.CEPT ERC REPORT 79-ENGL 2000 Ia 232b434 DOlb8Lb 020 ERC REPORT 79 Implementation of the Chester Agreement This report contains information on the implementation of the
3、 Chester 97 Agreement (CH97). It shows the collective experience of CEPT administrations in applying the Chester procedures and resolutions from mid 1997 to the end of 1999 together with outline plans regarding developments expected during the following years. Additional information is given regardi
4、ng ideas which have been developed to assist in the interpretation of certain parts of CH97. Further monitoring of the implementation of the CH97and the preparation of a conference to revise the Stockholm Agreement of 1961 will take place in project team FM PT24. STD.CEPT ERC REPORT 79-ENGL 2000 232
5、6414 0016817 Tb7 W ERC REPORT 79 Contents I 1 SUMMARY OF MAIN ISSUES IN THE REPORT . 1 2 PLANNING CRITERIA . 2 2.1 Recommendation ITU-R BT.1368 . 2 2.2 Receiver design . 2 INFORMATION ON METHODS OF COVERAGE ANALYSIS 3 3.1 Planning parameters 3 3.2 Closely spaced analogue stations . 3 3.3 Low power a
6、nalogue stations 3 3.4 Minimum coverage radius 3 3.5 Effective antenna height 3 3.6 Field strength predictions at short distances . 3 3.7 Offset on analogue stations . 4 3.8 Use of Country boundary test points . 4 3.9 Transmitter sites outside country boundary . 4 3.1 O Use of terrain data . 5 3.1 1
7、 SFN coverage 5 3.1 2 Initial assessments of DVB-T coverage . 5 Annex 1 to Section 3: Predictions using Rec . 370 for path lengths less than 15 km in cases where terrain data are not available 6 Annex 2 to Section 3: Calculation of effective transmitting antenna height in cases where terrain data ar
8、e available . 7 3 Annex 3 to Section 3: Use of terrain data to improve propagation predictions . 8 Annex 4 to Section 3: Implementation of DTM server . 9 History 9 Data availability 9 DTM Server concept 9 Supported data formats . 10 G1 format . 10 HCM data . 10 Results . 11 Implementation 11 Applica
9、tions 11 CTP2 11 Conclusions . 11 4 APPLICATION OF THE PROCEDURES OF CHESTER 97 AGREEMENT (CH 97) . 12 4.1 Introduction 12 4.2 Experience in co-ordination . 12 4.2.1 Countries within co-ordination distance . 12 4.2.2 Protection of a conversion . 12 4.2.3 Protection of new DVB-T stations 12 4.2.4 The
10、 0.3 dB rule . : . 12 4.2.5 SFNs 13 4.2.6 Time scale for co-ordination . 13 4.2.7 Co-ordination of new analogue stations 13 4.3 Receiver issues 13 4.4 Planning criteria . 14 4.4.1 Minimum field strength and implementation margin 14 4.4.2 Implementation Margin 14 4.4.3 Protection criteria for televis
11、ion 14 4.4.4 Spectrum Mask 14 4.4.5 Protection criteria for other services 14 4.5 Practical experience . 14 4.5.1 Tests 14 4.5.2 Frequency Offset . 14 4.5.3 System variants 14 4.6.1 Rec . 370 . 15 4.6.2 4.6 Prediction methods Detailed Coverage Predictions 15 STD=CEPT ERC REPORT 79-ENGL 2000 O 232b4L
12、4 001b8L8 9T3 4.7 Location of Country boundary test points . : 15 4.8 4.8.1 Databases 15 4.8.2 Software . 15 4.8.3 Calculation of Reference Interference Situation 15 Annex 1 to Section 4: List of Administrations that have signed or acceded to Chester 97 Multilateral Agreement for DVB-T 16 Annex 2 to
13、 Section 4: Software for data management and compatibility analysis 18 5 IMPLEMENTATION OF CH97 RESOLUTIONS 22 5.1 Television station data collection . 22 5.2 Differences of opinion between administrations concerning the data for television stations . 22 5.2.1 Background 22 5.2.2 Action proposed to
14、assist in the resolution of differences of opinion . 23 5.2.3 Agreements between administrations concerning test point data . 24 5.3 Supply of data for DVB-T stations . 24 5.4 ITU-BR forms of notice 24 Annex 1 to Section 5: Generator of ITU Forms of Notice 25 INFORMATION ON DVB-T IMPLEMENTATION IN E
15、UROPE . 26 6.1 Introduction 26 6.2 DVB-T implementation progress overview 28 6.2.1 Introductory notes 28 6.2.2 Additional notes for individual countries: . 30 6.3 Commercial Interests . 36 7.1 Introduction 38 7.2 Planning Conference . 38 7.2.1 Background 38 7.2.2 Considerations . 39 7.3.1 Migration
16、issues . 40 7.3.2 Analogue channel assignment in Europe 40 7.3.3 Planning Issues 40 7.3.4 ST61 conversion studies 40 7.4 Planning Options 41 7.4.1 General 41 7.4.2 SFN planning issues 41 Initial estimates of spectrum requirements for DVB-T . 41 7.5.1 Number of multiplexes required . 41 7.5.2 Number
17、of channels required per multiplex for area coverage 42 7.5.3 Spectrum sharing . 42 7.5.4 Release of spectrum . , 42 7.5.5 Requirement for Band III 43 7.6 Interim conclusions 43 Annex 1 to Section 7: Results of an EBU survey on planning requirements for digital terrestrial television services 44 Ann
18、ex 2 to Section 7: Analysis of analogue television assignments in Europe 47 Annex 3 to Section 7: Results of study into coverage achieved from ST61 conversions (using COCOT5 software) for nine main stations in the south east of the UK . 48 Annex 4 to Section 7: Spectrum requirement evaluation for a
19、theoretical network approach . 49 Availability of Information and Software . 15 Annex 3 to Section 4: Country boundary considerations . 20 6 7 IDEAS ON THE APPROACH TO AN ALL-DIGITAL PLAN . 38 7.3 Migration from analogue to digital television 39 7.5 STD-CEPT ERC REPORT 79-ENGL 2000 W 232b4L4 001bBL9
20、 83“ ERC REPORT 79 Page 1 1 SUMMARY OF MAIN ISSUES IN THE REPORT Section 2: Proposals for modifications of planning criteria No changes to the Chester Agreement should be considered for the time being. Section 3: Information on coverage and network planning methods The way to deal with closely space
21、d stations, low power stations, stations with very small coverage radius and predictions over distances less than 15 km have been clarified as has the location of coverage boundary test points in those cases where a transmitter is situated outside its own country boundary. Terrain data with a resolu
22、tion of 30-arc sec are now freely available on internet. These data can be used to improve the field strength prediction accuracy by means of the terrain clearance angle in co- ordination on a bilateral basis. This facility has been incorporated in the ER0 software (COCOT). Frequency offset conditio
23、ns have been clarified. It is explained that reception is possible at some locations outside the planned service area for some percentage of the time. Section 4: Application of CH97 procedures A great number of points which arise in the application of the CH97 procedures are pointed out. In general
24、there are no great difficulties in applying CH97 procedures, however strict application leads to severe restrictions on proposed digital stations. A number of administrations are applying more relaxed criteria. The non-availability of reliable reference values (see section 5) may cause problems for
25、early co- ordinations. The Chester Agreement is currently signed by 34 administrations, 5 administrations still need to ratify or confirm the signature. A considerable amount of available software produced by ER0 and EBU has been listed. The software is available on the COCOT CD-ROM (last version CO
26、COT 5). Section 5: Implementation of CH97 resolutions Television station data have been received from 36 CEPT administrations. Data for a further 6 CEPT administrations were derived by the ER0 from ST61 data. Data for 12 countries neighbouring CEPT countries were derived by the ER0 from ST61 data. T
27、he data will be used for calculating. the reference values for co-ordination. An amended procedure has been adopted for sending in corrected and missing stations; the final results of coverage calculations using the corrected data will be available on 19/5/2000. This procedure includes provisions of
28、 dealing with disputed stations. The television data is contained on the COCOT CD-ROM (latest version COCOT 5). Section 6: Information on DVB-T implementation Three countries have now launched DVB-T services and several others are currently expected to launch services in the next two to three years.
29、 Test transmissions and pilot projects are underway in 16 countries. A total of 20 countries are undertaking DVB-T planning and have provided information on the current situation regarding the introduction of DVB-T. Sixteen of them have Co-ordination in progress. STD.CEPT ERC REPORT 79-ENGL 2000 I 2
30、32b4L4 00Lb820 551 ERC REPORT 79 Page 2 Section 7: Ideas on the approach to an all digital plan It is considered that a Planning Conference is necessary to migrate from analogue to digital television. The ERC has agreed that the Secretary-General of the ITU should be requested by a sufficient number
31、 of CEPT countries in accordance with Article 27 of the ITU Convention to apply the relevant procedure for the convening of a regional conference at the request of Member States. Initial estimates indicate that to provide for six multiplexes per area in Europe will require access to at least 42 chan
32、nels. The success of an all-digital plan will be dependent on finding an acceptable means to migrate from the pre existing situation. 2 PLANNING CRITERIA 2.1 Recommendation ITU-R BT.1368 ITU-R S.G 11 has proposed a draft revision of Recommendation ITU-R BT.1368-1 for adoption by correspondence by th
33、e end of 1999. In this draft revision the planning parameters for planning digital terrestrial television are incorporated including protection ratios to and from analogue services. The protection ratios for analogue systems are incorporated in Rec.655. In the draft revision of Rec. 1368-1 the Co-ch
34、annel and adjacent channel protection ratios values for analogue TV interfered with by DVB-T are proposed to be the same for both 7 and 8 MHz DVB-T systems. Protection ratios for wanted SECAM systems interfered with by DVB-T systems have been harmonise to 35 dB which is now in line with the Chester
35、97 reference reception conditions. Some changes are proposed for protection ratios for the overlapping channel cases. Increased production of consumer receivers is expected in the near future. It will then be possible to verify some existing protection ratios values. Working Party FM-PT24 is therefo
36、re of the opinion that no changes to Chester Agreement should be considered for the time being. Consolidated tables will be produced in the course of next year when data become available. 2.2 Receiver design Due to the frequency spectrum needs for DVB-T, services in VHF Band III will also be used in
37、 a number of European countries (see also Section 7.5.5). It is therefore extremely important to draw to the attention of television receiver manufacturers the need for DVB-T receivers to be capable of operation in 7 MHz channel also. In this case special care should be taken to guarantee suitable r
38、ejection of adjacent channel signals. Receiver manufacturers have indicated that they are able to produce receivers which can deal with both 7 and 8 MHz channel rasters in Band III but such receivers will have a somewhat higher cost than receivers with only an 8 MHz bandwidth. In the future the rece
39、iver manufacturers would prefer to have a single bandwidth, either 7 or 8 MHz (and preferably the latter) in Band III. Receiver manufacturers have also indicated that 100% of receiver production would achieve a noise figure no greater than 8 dB. Project Team FM 24 agreed to continue to base planning
40、 on a noise figure of 7 dB. STD-CEPT ERC REPORT 79-ENGL 2000 = 232b414 001b82L 498 ERC REPORT 79 Page 3 3 INFORMATION ON METHODS OF COVERAGE ANALYSIS 3.1 Planning parameters The planning parameters used are those given in CH97. It is recognised that Rec. ITU-R BT.1368 contains protection ratios and
41、other planning parameters to be used in connection with DVB. At present, however, the differences between the values given in the Final Acts of CH97 and Rec. ITU-R BT.1368 are few and mainly insignificant. Therefore the values to be used remain those given in CH97. 3.2 Closely spaced analogue statio
42、ns It appears from the data sent in to the ER0 that in a number of cases Co-channel or adjacent channel stations are located close to each other within one and the same country. Generally, this leads to a higher than expected usable field strength for these stations. In the case of Co-channel or adj
43、acent channel stations located closer than 25 km from each other mutual interference is disregarded if both stations belong to the same administration. However, for all other stations (Co-channel and adjacent channel) both transmitters are treated as interferers, increasing the usable field strength
44、 for these other stations. 3.3 Low power analogue stations In order to save time during initial coverage calculations, simple rules are applied to low power stations. A station is regarded as a low power station if the maximum e.r.p. in both of the two planes of polarisation is lower than 20 dBW. In
45、 such cases, only a single test point is created (in place of the 36 test points for higher power stations) and this is situated at the transmitter site. 3.4 Minimum coverage radius During initial coverage calculations, the minimum coverage radius has been set to 1 km. 3.5 Effective antenna height I
46、n Rec. ITU-R P.370 the definition of the effective antenna height involves the ground height in the distance range 3 to 15 km. This leads to unsatisfactory results for stations with a coverage radius less than 15 km. In order to overcome this problem an interpolation formula for the effective antenn
47、a height has been derived and implemented for distances up to 15 m. This formula (given in Annex 1 to Section 3) is applicable to calculations where the effective transmitting antenna height and the transmitting antenna height above ground level are known and where terrain data are not used (see als
48、o Section 3.8). 3.6 To carry out field strength predictions at shorter distances than 10 km the propagation curves given in ITU-R Rec. 370 have been extended to less than 1 km by extrapolation. Field strength predictions at short distances 3.7 Offset on analogue stations When calculating the coverag
49、e area for a given analogue station the information about the offsets is used as follows: If either the wanted or the unwanted stations: uses the offset type “U; the protection ratio for non-precision non-offset is used. If either the wanted or the unwanted stations: uses the offset type “N; and, neither of them uses offset type “U; the protection ratios for non-precision offset are used. If both the wanted and the unwanted stations: use the offset type Y; the protection ratios for precision offset are used. It should be noted that in the case where the two s
