ITU-R REPORT BS 2208-2010 Possible use of VHF band I for digital sound broadcasting services《数字声音广播业务甚高频(VHF)带I的可能性使用》.pdf
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1、 Report ITU-R BS.2208(10/2010)Possible use of VHF band I for digitalsound broadcasting servicesBS SeriesBroadcasting service (sound)ii Rep. ITU-R BS.2208 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spect
2、rum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication
3、Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent stateme
4、nts and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Reports (Also available o
5、nline at http:/www.itu.int/publ/R-REP/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite servic
6、es P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management Note: This ITU-R Report was approved in English by th
7、e Study Group under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2011 ITU 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rep. ITU-R BS.2208 1 REPORT ITU-R BS.2208 Possible use of VHF
8、 Band I for digital sound broadcasting services (2010) TABLE OF CONTENTS Page 1 Introduction 1 2 Why consider the use of these bands for digital sound broadcasting? . 2 3 What digital broadcasting systems might be considered in Band I? 3 4 Band I . 4 4.1 The existing use of Band I in Region 1 4 4.2
9、The regulatory conditions for Band I in Region 1 5 4.3 Technical considerations related to Band I in Region 1 . 6 5 Conclusions and proposals . 7 Annex 1 Extract from the ST61 Plan: Assignments in Band I . 8 Annex 2 Extract from Article 5 of the ITU Radio Regulations for Band I . 9 Annex 3 Extracts
10、from the ST61 Agreement: Modification and notification procedures 11 Annex 1 to the Regional Agreement for the European broadcasting area Tables of distances to be used in the application of Article 4 of the Agreement . 13 1 Introduction Radio and television broadcasting is in the process of migrati
11、ng to digital modulation schemes to better exploit the possibilities offered by existing and new delivery platforms. Digital modulation offers significant advantages in being able to give: consistent quality which is less dependent on variations in the channel; more effective use of channel capacity
12、 through resilient coding and advanced compression techniques; easier access through automatic or assisted tuning; versatility by including audiovisual and data information in the same channel. 2 Rep. ITU-R BS.2208 Recognizing that analogue broadcasting technologies still find significant use and wi
13、ll continue to do so for some time to come, this Report will restrict itself to consideration of digital systems. While the Internet and associated systems are playing an increasingly important role in the delivery of sound broadcasting services, conventional terrestrial radio still plays a very imp
14、ortant part in delivering radio to its audiences. Demand for services outstrips the channel capacity and so there is pressure to increase that capacity. More efficient digital formats play a major part in this quest. However, this document examines the possibility of using digital formats in parts o
15、f the spectrum that are, have been, or can be made available for broadcasting but are not very much used at the moment. VHF Band I is taken to include frequencies between 47 MHz and 68 MHz. From a technical point of view, there is no reason why this should not be extended to include the OIRT Bands (
16、see Article 5 of the Radio Regulations (RR) used in certain countries for FM analogue broadcasting. While this band may not be available in all locations it is a valuable broadcasting resource where it is available and the technical arguments are the same as for the frequency bands immediately below
17、 it. 2 Why consider the use of these bands for digital sound broadcasting? Traditionally sound broadcasting has been carried out in the LF, MF, HF and VHF (Band II) bands. More recently, digital (DAB) sound services in VHF (Band III) have been broadcast in certain parts of the world. With the except
18、ion of the HF bands, where the unique propagation characteristics are vital to long distance international sound services, VHF Band II has become predominant among them. So much so that in many parts of the world the 88 to 108 MHz band has become crowded and there is little or no opportunity for new
19、 services to be introduced. For various reasons not least, better use of spectrum some countries are considering, or are in the process of introducing, digital sound broadcasting systems. At the present time the majority of such services are located in VHF Band III using the DAB system. It has not b
20、een possible to introduce DAB services into Band II because the band is already heavily used and the introduction of a single DAB multiplex would require eight existing services to be switched off to make space. Past experience has shown that it can take a long time for a new broadcasting format to
21、establish itself. FM in Band II was around for a very long time before it became the predominant sound broadcasting system, AM in the MF band was displaced from this predominant role. It is therefore to be expected that any radio service will have to be simultaneously broadcast in both the old, anal
22、ogue, and new, digital, formats until such time as the bulk of the audience has migrated. Obviously this will make a further demand on spectrum and further inhibit the ability to introduce new services. The restricted quality of sound broadcasting in the LF and MF bands means that it has fallen from
23、 favour with a large part of its traditional users; both broadcasters and audiences. Despite this there is still a large residual use. In certain parts of the world, including Europe, the LF and MF bands are still crowded. Even if channels were available, their perceived low analogue quality and wid
24、e area propagation characteristics make them unattractive to local and community broadcasters. There is a high demand for radio services to small, local and even community service areas. Such service areas are usually limited to a radius of less than a few kilometres covering just a small part of a
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