1、 ETSI TS 102 550 V1.3.1 (2008-01)Technical Specification Satellite Earth Stations and Systems (SES);Satellite Digital Radio (SDR) Systems;Outer Physical Layer of the Radio InterfaceETSI ETSI TS 102 550 V1.3.1 (2008-01) 2 Reference RTS/SES-00300 Keywords digital, layer 1, radio, satellite ETSI 650 Ro
2、ute 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 can be downloade
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4、ll be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is avail
5、able 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 permission. The c
6、opyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2008. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM is
7、 a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 550 V1.3.1 (2008-01) 3 Contents Intellectual Property Rights5 Foreword.5 1 Scope 6 2 References 6 2.1 Informative references6 3 Symbols and abbreviations.7 3.1 Symbols7 3.2 Abbre
8、viations .7 4 Outer physical layer7 4.0 Number format definitions .7 4.0.1 Number format and transmission order 7 4.0.2 SI-Prefix Notation.8 4.0.3 Default Settings 8 4.1 Overview 8 4.2 Interfacing to Service Layer (SL).12 4.3 S-TS to OPL adaptation layer: S-TS encapsulation .12 4.3.1 PF infoword for
9、mat for S-TS stream type 0 (dummy packet) 13 4.3.2 PF infoword format for S-TS stream type 1 (transparent) 14 4.3.3 PF infoword format for S-TS stream type 2 (MPEG-TS).14 4.3.4 PF infoword format for S-TS stream type 3 (IP stream).15 4.4 PL FEC: turbo code17 4.4.1 Interface to OPL encapsulation.17 4
10、.4.2 Turbo encoder.17 4.4.3 Turbo code termination.21 4.4.4 Turbo Interleavers.23 4.4.5 Output of turbo encoder24 4.4.6 FEC Parameter signalling .24 4.4.7 Diversity combining .25 4.4.8 FEC Parameters for the signalling pipe 25 4.5 Mixer 25 4.6 Segmenter and Slot demultiplexer26 4.7 Disperser.27 4.8
11、Collector.28 4.9 C-TS multiplexer29 4.10 Configuration of the OPL.30 4.10.1 Signalling pipe30 4.10.1.1 Encoding and interleaving of signalling pipe30 4.10.1.2 SOF Preamble .30 4.10.1.3 Format of the signalling pipe infoword.30 4.10.2 Partitioning of the C-TS multiplex .36 4.10.3 S-TS schedule and sl
12、ot allocation.37 4.10.4 S-TS re-scheduling and slot re-allocation.38 4.10.5 Birth/death of S-TS.38 4.10.6 S-TS ID.38 4.10.7 Calculation of the disperser profile.39 4.10.8 Configuration of the tail pipe40 4.10.9 Unused pipes.40 4.10.10 Announcing reconfigurations and reschedulings 40 4.10.11 Pipe rec
13、onfiguration41 4.11 Void45 4.12 Network aspects .45 Annex A: Void 47 ETSI ETSI TS 102 550 V1.3.1 (2008-01) 4 Annex B (normative): Calculation of the CRC word .48 Annex C (informative): Bibliography.49 History 50 ETSI ETSI TS 102 550 V1.3.1 (2008-01) 5 Intellectual Property Rights IPRs essential or p
14、otentially 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 Essent
15、ial, 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. N
16、o 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 ETSI Technical Committee Satell
17、ite Earth Stations and Systems (SES). TC SES is producing standards and other deliverables for Satellite Digital Radio (SDR) systems. An SDR system enables broadcast to fixed and mobile receivers through satellites and complementary terrestrial transmitters. Functionalities, architecture and technol
18、ogies of such systems are described in TR 102 525 1. Several existing and planned ETSI standards specify parts of the SDR system, with the aim of interoperable implementations. The physical layer of the radio interface (air interface) is divided up into the outer physical layer, the inner physical l
19、ayer with a single carrier transmission, and the inner physical layer with multiple carriers transmission. These parts can be used all together in SDR compliant equipment, or in conjunction with other existing and future specifications. The present document specifies the outer physical layer. The in
20、ner physical layer with single carrier transmission is specified in TS 102 551-1 2, and with multiple carriers transmission in TS 102 551-2 3. The present document supersedes the previous version of the document and is recommended for new implementations. All changes from the previous version are ba
21、ckward compatible. ETSI ETSI TS 102 550 V1.3.1 (2008-01) 6 1 Scope The present document concerns the radio interface of SDR broadcast receivers. It specifies the functionality of the outer physical layer. It allows implementing this part of the system in an interoperable way. 2 References References
22、 are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions 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
23、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. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Referenc
24、e. For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably, the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the reference should, as far as possible, remain valid for the expe
25、cted 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 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 c
26、annot guarantee their long term validity. 2.1 Informative references The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (inc
27、luding any amendments) applies. 1 ETSI TR 102 525: “Satellite Earth Stations and Systems (SES); Satellite Digital Radio (SDR) service; Functionalities, architecture and technologies“. 2 ETSI TS 102 551-1: “Satellite Earth Stations and Systems (SES); Satellite Digital Radio (SDR) Systems; Inner Physi
28、cal Layer of the Radio Interface; Part 1: Single carrier transmission“. 3 ETSI TS 102 551-2: “Satellite Earth Stations and Systems (SES); Satellite Digital Radio (SDR) Systems; Inner Physical Layer of the Radio Interface; Part 2: Multiple carrier transmission“. 4 ISO/IEC 13818-1: “Information Techno
29、logy - Generic Coding of moving pictures and associated audio - Part 1: Systems“. 5 ISO/IEC 11172-1: “Information technology - Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s - Part 1: Systems“. ETSI ETSI TS 102 550 V1.3.1 (2008-01) 7 3 Symbols and
30、abbreviations 3.1 Symbols For the purposes of the present document, the following symbols apply: R Code rate 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AWGN Additive White Gaussian Noise BCH Bose, Ray-Chaudhuri, Hocquenghem code CRC Cyclic Redundan
31、cy Checksum C-TS Channel-Transport Stream CU Capacity Unit FEC Forward Error Correction ID IDentifier IP Internet Protocol IPL Inner Physical LayerIU Interleaving Unit LSB Least Significant Bit MPEG-TS MPEG Transport Stream MSB Most Significant Bit MTU Maximum Transfer Unit OPL Outer Physical Layer
32、PF Physical layer FEC PFIW Physical layer FEC Info Word PL Physical Layer QoS Quality of Service RFU Reserved for Future Use SL Service Layer SOF Start Of Frame S-TS Service-Transport Stream VBR Variable Bit Rate WER Word Error Rate 4 Outer physical layer 4.0 Number format definitions 4.0.1 Number f
33、ormat and transmission order Unless otherwise stated, all bit/symbol streams and values are transmitted with the following convention: In a stream, bits/symbols with a lower index are transmitted temporally earlier than those with a higher index. A prefix of a block of bits/symbols is transmitted te
34、mporally first, whereas a suffix is transmitted temporally last. Signed integer and signed fixed-point values are stored in twos complement format. If a value is represented by N bits, the Most Significant Bit (MSB), i.e. bit N-1, is transmitted temporally first followed by bits N-2 down to bit 0, t
35、he Least Significant Bit (LSB). This order is referred to as Big Endian. ETSI ETSI TS 102 550 V1.3.1 (2008-01) 8 For Bytes, the MSB, bit 7, is transmitted temporally first and the LSB, bit 0, last. Symbols of a BCH, Reed-Solomon or CRC-code are transmitted temporally in the following order: the symb
36、ol with highest degree in polynomial representation comes first and the symbol with degree 0 comes last. The format of integer and fix-point values are specified in the following way: the first letter is U for unsigned and S for signed values, the following value following that letter states the num
37、ber of integer bits. In the case of fixed-point values, this value is followed by a dot“.“ and another value, which specifies the number of fractional bits. Examples: U8, S3.2. 4.0.2 SI-Prefix Notation The present document uses the prefix notation as defined by the “Systme International dUnits“, i.e
38、. M (mega) represents 1 000 000 units, k (kilo) represents 1 000 units and m (milli) represents 0,001 units. 4.0.3 Default Settings If not stated otherwise, the following default settings are used: - RFU bits have value 0. 4.1 Overview Figure 1 displays the position and the interfaces of the Outer P
39、hysical Layer (in the following denoted by OPL) inside a complete broadcast transmission chain. The OPL connects to the Service Layer, where the interface is Service Transport Streams (S-TS) on the one side, and on the other side to the Inner Physical Layer (IPL - described in TS 102 551), where the
40、 interfaces are Channel Transport Streams (C-TS). ETSI ETSI TS 102 550 V1.3.1 (2008-01) 9 Figure 1: Position and interfaces of the OPL inside the transmission chain The following table gives an overview about the terminology used for the data streaming through the system. Description Comments SC Ser
41、vice component E.g. source encoded audio or video or other data SC-TS Service component transport stream ES Elementary Stream ES: Elementary Stream, a generic term for one of the coded video, coded audio or other coded data bitstreams, cf. MPEG-1 standard ISO/IEC 11172-1 5. Program A program is a co
42、llection of program elements. Program elements may be elementary streams (ES, SC-TS). Inline with the definition used for MPEG standard ISO/IEC 13818-1 4. Service Set of programs and related auxiliary information S-TS Service transport stream Generalized term for transport stream. MPEG-TS is one exa
43、mple for a service transport stream. MPEG-TS Transport stream compliant to MPEG standard ISO/IEC 13818-1 4 C-TS Channel transport stream Data stream (bit stream) representing the input to the modulator = data stream including all redundancy added by the FEC encoder - possibly with time-interleaving
44、- and carrying configuration signalling information for the receiver. The content of the C-TS is referred to as a C-TS multiplex (a multiplex of encoded and interleaved S-TS plus signalling information). A bouquet of programs is carried by one or more C-TS multiplexes. ETSI ETSI TS 102 550 V1.3.1 (2
45、008-01) 10Description Comments Channel RF resource The meaning “RF resource” is aligned with the terminology used for DVB. The functionality of the Outer Physical Layer is to provide Forward Error Correction and time interleaving for resistance against a variety of transmission channel conditions. D
46、ifferent transport channels are used in the OPL to offer the requested performance for different types of services. These transport channels are called pipes in the scope of the present document. The OPL is configurable in terms of error protection, outage mitigation in case of signal losses, end-to
47、-end delay, zapping time, payload throughput and receiver complexity. Multiple pipes can be used as described above. Each of them contains FEC, Mixer and Disperser. One special pipe exists whose functionality is to transmit all relevant parameters to decode the other pipes. The so-called signalling
48、pipe is always transmitted at the lowest coderate which is 1/5. The modulation of the signalling pipe is equal to the modulation of the data pipes. The general block diagram of the OPL functionality is given in figure 2. ETSI ETSI TS 102 550 V1.3.1 (2008-01) 11Figure 2: General overview of the OPL f
49、unctionality ETSI ETSI TS 102 550 V1.3.1 (2008-01) 12The processing, multiplexing and demultiplexing of the data in the OPL is displayed in figure 3. An S-TS scheduler multiplexes together all S-TS contained in the pipe. The scheduler is controlled by an S-TS schedule, which determines the number of words taken from one S-TS before the multiplexer selects the next S-TS of the pipe. After an encapsulation, FEC encoding and mixing, the codewords (segmented into interleaver units) are demultiplexed codeword-wise to the slots of the consi
