1、 ETSI TS 102 759 V1.1.1 (2008-10)Technical Specification Digital Radio Mondiale (DRM);AMSS Distribution Interface (ASDI)European Broadcasting Union Union Europenne de Radio-Tlvision EBUUER ETSI Draft ETSI TS 102 759 V1.1.1 (2008-10)2Reference DTS/JTC-DRM-18 Keywords broadcasting, digital, DRM, radio
2、, AM ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document
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5、cuments is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written p
6、ermission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2008. European Broadcasting Union 2008. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI re
7、gistered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI Draft ETSI TS 102 759 V1.1.1 (2008-10)3Contents Intellectual Property Rights 4 Foreword . 4 Introduction 4 1 Scope 6 2 References 6 2.1 Norm
8、ative references . 6 2.2 Informative references 6 3 Definitions, symbols, abbreviations and conventions 7 3.1 Definitions 7 3.2 Symbols 8 3.3 Abbreviations . 8 3.4 Conventions 9 4 General description. 9 4.1 System overview 9 4.2 System architecture 9 5 TAG Items 10 5.1 Mandatory TAG Items . 11 5.1.1
9、 Protocol type and revision (*ptr) 11 5.1.2 ASDI Sequence Number (assn) 11 5.1.3 AMSS block (ablk) . 12 5.1.4 ASDI asynchronous reset (arst) 12 5.2 Optional TAG Items . 13 5.2.1 ASDI timestamp (atst) 13 5.3 Revision history 14 Annex A (informative): AMSS data structure . 15 Annex B (normative): ASDI
10、 Profiles 16 Annex C (normative): Muting Mechanism 17 C.1 Muting 17 Annex D (informative): ASDI Timestamps 18 D.1 Relationships 18 D.2 Rationale . 18 Annex E (normative): Physical presentation . 19 History 20 ETSI Draft ETSI TS 102 759 V1.1.1 (2008-10)4Intellectual Property Rights IPRs essential or
11、potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essen
12、tial, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
13、No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by Joint Technical Committee (JTC
14、) Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the specific field of b
15、roadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whos
16、e work includes the co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX
17、(Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 Introduction The frequency bands used for broadcasting below 30 MHz are: Low Frequency (LF) band - from 148,5 KHz to 283,5 KHz, in ITU Region 1 1 only; Medium Frequency (MF) band - from 526,5 KHz to 1 606,5 KHz, in ITU Regions 1 1 and
18、3 1 and from 525 KHz to 1 705 KHz in ITU Region 2 1; High Frequency (HF) bands - a set of individual broadcasting bands in the frequency range 2,3 MHz to 27 MHz, generally available on a Worldwide basis. These bands offer unique propagation capabilities that permit the achievement of: large coverage
19、 areas, whose size and location may be dependent upon the time of day, season of the year or period in the (approximately) 11 year sunspot cycle; portable and mobile reception with relatively little impairment caused by the environment surrounding the receiver. There is thus a desire to continue bro
20、adcasting in these bands, perhaps especially in the case of international broadcasting where the HF bands offer the only reception possibilities which do not also involve the use of local repeater stations. ETSI Draft ETSI TS 102 759 V1.1.1 (2008-10)5However, broadcasting services in these bands: us
21、e analogue techniques; are subject to limited quality; are subject to considerable interference as a result of the long-distance propagation mechanisms which prevail in this part of the frequency spectrum and the large number of users. As a direct result of the above considerations, there is a desir
22、e to effect a transfer to digital transmission and reception techniques in order to provide the increase in quality which is needed to retain listeners who, increasingly, have a wide variety of other programme reception media possibilities, usually already offering higher quality and reliability. In
23、 order to meet the need for a digital transmission system suitable for use in all of the bands below 30 MHz, the Digital Radio Mondiale (DRM) 2 consortium was formed in early 1998. The DRM consortium is a non-profit making body which seeks to develop and promote the use of the DRM system worldwide.
24、Its members include broadcasters, network providers, receiver and transmitter manufacturers and research institutes. More information is available from their website (http:/www.drm.org/). The AM Signalling System (AMSS) 3 adds a limited amount of service information to analogue broadcasts in the fre
25、quency bands below 30 MHz in a complementary way to the Digital Radio Mondiale (DRM) system. It is intended to be used by broadcasters in the transition to all digital transmission by providing labelling and frequency information for a better user experience. ETSI Draft ETSI TS 102 759 V1.1.1 (2008-
26、10)61 Scope The present document gives the specification of the link between an AMSS generator and an AMSS modulator. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revision
27、s do not apply. Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document; - for informative references
28、. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably, the primary source of the reference
29、d document should be cited, in order to ensure traceability. Furthermore, the reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the method of access to the referenced document and the full network address, with the same punctuation
30、and use of upper case and lower case letters. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are indispensable for the application of the present docu
31、ment. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. 1 ITU-R Radio Regulations. 2 ETSI ES 201 980: “Digital Radio Mondiale (DRM); System Specification“. 3 ETSI TS 102 386: “Digital R
32、adio Mondiale (DRM); AM Signalling System (AMSS)“. 4 ETSI TS 102 820: “Digital Radio Mondiale (DRM); Multiplex Distribution Interface (MDI)“. 5 ETSI TS 102 821: “Digital Radio Mondiale (DRM); Distribution and Communications Protocol (DCP)“. 6 ETSI TS 102 358: “Digital Radio Mondiale (DRM); Specific
33、Restrictions for the use of the Distribution and Communication Protocol (DCP)“. 2.2 Informative references The following referenced documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific references, the lates
34、t version of the referenced document (including any amendments) applies. Not applicable. ETSI Draft ETSI TS 102 759 V1.1.1 (2008-10)73 Definitions, symbols, abbreviations and conventions 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Alternative
35、Frequency Signalling (AFS): feature of the DRM multiplex which allows receivers to automatically re-tune to a frequency offering more reliable reception without a break in the decoded audio AMSS block: 47 bits containing AMSS data AMSS group: 94 bits consisting of the two types of AMSS blocks, Block
36、 1 and Block 2 byte: collection of 8 bits Coordinated Universal Time (literally Universel Temps Coordonn) (UTC): time format counting in standard SI seconds with periodic adjustments made by the addition (or removal) of leap seconds to keep the difference between UTC and Astronomical Time less than
37、0,9 s NOTE: TAI and UTC were defined as having an initial offset of 10 s on January 1st 1972 (TAI prior to this date had a variable fractional offset to UTC as the two times did not use the same definition of the second). As at November 2007 there have been 23 leap seconds, all positive, making TAI
38、= UTC + 33. Data Entity Group: collection of DRM SDC data entities, protected by a 16-bit Cyclic Redundancy Check Distribution and Communication Protocol (DCP): transport layer communications protocol providing fragmentation, addressing and/or reliable data transmission over errored channels using a
39、 Reed Solomon code to provide Forward Error Correction (FEC) dynamic information: AMSS information that cannot be sensibly cached by an AMSS modulator for later transmission because it would be out of date, for example the time and date Global Position System (GPS): constellation of satellites provi
40、ding accurate time and position information to receivers GPS Time: time signal broadcast by the GPS satellites using an epoch of January 6th 1980 with no leap seconds and a “week number“ (actually a modulo-604 800 seconds number) that wraps every 1 024 weeks (approximately 19,7 years) Greenwich Mean
41、 Time (GMT): historically the standard time for all international applications, now superseded by UTC International Atomic Time (literally Temps Atomique International) (TAI): time format counting in standard SI seconds NOTE: TAI and GPS Time have a constant offset of 19 s. Modified Julian Date (MJD
42、): date format based on the number of days since midnight GMT on 17thNovember 1858 AD NOTE: Time can be represented as a fraction of a day, however as MJD is subject to leap seconds, the fractional part corresponding to an SI second is of variable size and hence complex to implement in a fixed width
43、 bit-field. Multi-Frequency Network (MFN): network of transmitters serving a large geographic area using different radio frequencies to achieve improved reliability of reception Offset Word: sequence of bits applied to a Cyclic Redundancy Check which breaks the cyclic property of the check and allow
44、s an AMSS receiver to perform Block synchronization SDC Data Entity: part of the SDC which contains a specific type of information such as alternative frequency or region information Service Description Channel (SDC): channel within the DRM multiplex that gives information necessary to decode the se
45、rvices included in the multiplex. ETSI Draft ETSI TS 102 759 V1.1.1 (2008-10)8Single Frequency Network (SFN): network of transmitters sharing the same radio frequency to cover an area static information: AMSS information that could be cached by an AMSS modulator for later transmission as it is gener
46、ally static in nature such as the service label or the language TAG Item: DCP elemental type combining in a single logical data the name, length and value of the data TAG Name: name field within an individual TAG Item used to identify an individual piece of information TAG Packet: collection of TAG
47、Items with a header carrying a cohesive and self-contained block of data TAG Value: payload of a TAG Item 3.2 Symbols For the purposes of the present document, the following symbols apply: n An item that can be repeated multiple, n, times 3.3 Abbreviations For the purposes of the present document, t
48、he following abbreviations apply: AFS Alternative Frequency Signalling AM Amplitude ModulationAMSS AM Signalling System ASDI AMSS Distribution Interface BOOTP BOOT Protocol CRC Cyclic Redundancy Check DCP Distribution and Communication Protocol DEG Data Entity Group DHCP Dynamic Host Configuration P
49、rotocol DRM Digital Radio Mondiale FEC Forward Error Correction GMT Greenwich Mean Time GPS Global Positioning SystemHF High Frequency IP Internet Protocol LF Low Frequency LSb Least Significant bit MDI Multiplex Distribution Interface MF Medium Frequency MFN Multi-Frequency Network MJD Modified Julian Date MSb Most Significant bit RF Radio Frequency rfu reserved for future use SDC Service Description Channel SFN Single Frequency NetworkSMFN Synchronized Multi-Frequency Network TAG Tag, Length, Value TAI International Atom
