1、 ETSI TR 102 768 V1.1.1 (2009-04)Technical Report Digital Video Broadcasting (DVB);Interaction channel for Satellite Distribution Systems;Guidelines for the use of EN 301 790 in mobile scenariosETSI ETSI TR 102 768 V1.1.1 (2009-04) 2Reference DTR/JTC-DVB-237 Keywords digital, DVB, satellite, TV ETSI
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6、. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2009. 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. 3G
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8、the GSM Association. ETSI ETSI TR 102 768 V1.1.1 (2009-04) 3Contents Intellectual Property Rights 6g3Foreword . 6g3Introduction 6g31 Scope 8g32 References 8g32.1 Normative references . 8g32.2 Informative references 8g33 Definitions, symbols and abbreviations . 11g33.1 Definitions 11g33.2 Symbols 11g
9、33.3 Abbreviations . 11g34 Reference model . 13g34.1 Line-Of-Sight Scenarios . 14g34.1.1 Maritime . 14g34.1.2 Aeronautical 14g34.2 Non-LOS Scenarios 14g34.2.1 Railway . 14g34.2.2 Vehicular 15g35 Forward link . 16g35.1 Spectrum Spreading in the Forward Link . 16g35.1.1 Spectrum Spreading in the Forwa
10、rd Link: code acquisition sub-system . 17g35.1.1.1 Acquisition performances in the railway scenario 19g35.1.1.1.1 Cold start code acquisition design . 20g35.1.1.1.2 Acquisition after a short interruption . 23g35.1.1.1.3 Warm Start Acquisition . 24g35.2 Fast re-synchronization in mobile scenarios 25g
11、35.2.1 Forward link re-synchronization issues in the Railway scenario 25g35.2.1.1 System assumptions for the analysis . 25g35.2.1.2 Forward link carrier stability analysis . 26g35.2.1.3 Forward link timing instability analysis 26g35.2.1.3.1 Timing instabilities due to terminal acceleration . 26g35.2
12、.1.3.2 Timing instabilities due to residual frequency jitter 26g35.2.1.3.3 Conclusions on timing instabilities 26g35.2.1.4 Forward link frame acquisition analysis . 26g35.2.1.5 Conclusions on Forward link re-synchronization 27g35.3 Forward link countermeasures for Non-LOS mobile scenarios . 27g35.3.
13、1 Proactive retransmission on the forward path for TCP traffic in Railway scenarios 27g35.3.2 Link layer FEC protection 28g35.3.2.1 General LL-FEC architecture 28g35.3.2.2 Guidelines on Link Layer FEC parameters selection 29g35.3.2.3 Guidelines for the selection of the LLFEC profile 32g35.3.2.4 Sele
14、ction of an elementary stream carrying LL-FEC 34g35.3.2.4.1 Assignment of LL-FEC TS elementary stream to RCST 35g35.3.2.4.2 Assignment of LL-FEC stream gse_fec_id to RCST 35g35.3.2.5 Use of LL-FEC on GSE generic streams 35g35.3.2.5.1 Application data transfer over GSE-FEC streams . 35g35.3.2.5.2 Car
15、riage of parity data over GSE-FEC streams . 36g35.3.2.5.3 Use of the CRC_32 extension header 37g35.3.3 Protection of the signalling . 38g35.4 Guidelines for the use of VCM/ACM in mobile scenarios 38g36 Return link 39g36.1 Doppler drift and time correction . 39g3ETSI ETSI TR 102 768 V1.1.1 (2009-04)
16、46.1.1 Carrier Frequency Doppler Shift 40g36.1.1.1 Log-On 40g36.1.1.2 Carrier Frequency Synchronisation Maintenance . 40g36.1.2 Symbol Rate Doppler Shift . 40g36.1.3 Burst Timing . 40g36.1.3.1 Log-On 40g36.1.3.2 Timing Synchronisation Maintenance. 42g36.2 Spectrum spreading in the return link. 43g36
17、.2.1 Spreading description . 43g36.2.2 Despreading description . 43g36.3 Return link countermeasures for Non-LOS mobile scenarios 45g36.3.1 Proactive retransmission technique . 45g36.3.1.1 Proactive retransmission performance in the railway scenario . 46g36.3.2 Link Layer FEC protection in the retur
18、n link 48g36.3.3 Protection of signalling in the return link . 48g37 Synchronization procedures . 48g37.1 Logon in the presence of a large timing uncertainty 48g37.2 Logoff procedure 48g38 Control and management 48g38.1 Control and monitoring functions for mobile terminals . 48g38.1.1 Interference S
19、cenarios . 49g38.1.1.1 FSS Interference Environment 49g38.1.1.2 Terrestrial and Scientific Interference Environment . 50g38.1.2 CMF and Interference Mitigation Techniques 50g38.1.2.1 Antenna Pointing and EIRP 51g38.1.2.2 Exclusion Zones 51g38.1.2.3 Fault Detection 52g38.2 Handover in Mobile Systems
20、. 52g38.2.1 Reference Network . 52g38.2.2 Beam Handover in Mobile Systems . 53g38.2.2.1 Handover Strategy . 53g38.2.2.2 Position Based Detection/Recommendation . 54g38.2.2.2.1 Position Measurement . 55g38.2.2.2.2 Geometrical Considerations 56g38.2.2.2.3 Data Structures 58g38.2.2.2.4 Signalling of Ha
21、ndover Recommendation . 58g38.2.2.3 Centralized Handover Detection . 59g38.2.2.4 Example Handover Decision . 59g38.2.2.5 Handover Execution 60g38.2.2.5.1 Key Architectural Features / Assumptions 60g38.2.2.5.2 Overall Handover Procedure . 61g38.2.2.5.3 Forward Link Handover 62g38.2.2.5.4 Return Link
22、Handover . 62g38.2.2.5.5 Beam Handover: Event Synchronisation / Handover Signalling . 64g38.3 Gateway Handover in Mobile satellite systems 73g38.3.1 Handover Detection 75g38.3.2 Handover Decision . 75g38.3.3 Handover Execution . 75g39 Continuous Carrier Operation 77g39.1 Architecture and Modes of Op
23、eration 77g39.2 Bandwidth Management . 78g39.3 Signalling . 79g39.3.1 Forward Link Signalling . 79g39.3.1.1 Carrier Description 79g39.3.1.2 Carrier Assignment and Release . 82g39.3.1.3 Other Forward Link Signalling . 82g39.3.2 Return Link Signalling 82g39.4 Physical Layer 83g39.4.1 Synchronisation 8
24、3g39.4.2 Encapsulation 83g3ETSI ETSI TR 102 768 V1.1.1 (2009-04) 59.4.3 Modulation and Coding 83g39.4.4 Adaptive Operation . 84g39.4.4.1 Transmit Power Control 84g39.4.4.2 VCM Controlled by the NCC 84g39.4.4.3 VCM with Distributed Control . 84g39.4.5 Spectrum Spreading 84g39.4.5.1 Return link contin
25、uous carrier code synchronization 85g39.4.5.1.1 Phase noise sensitivity assessment 86g39.4.5.1.2 ROC performance in AWGN 86g39.4.5.1.3 Mean Acquisition Time performance in AWGN 87g39.4.5.1.4 Performance in Rice Fading Channels 89g39.4.6 Phase Noise impact . 90g39.4.6.1 Simulation conditions 90g39.4.
26、6.1.1 Phase noise generation and synchronization circuits . 91g39.4.6.2 Performance results . 92g39.4.6.3 Conclusion 93g310 System and performance requirements 93g310.1 QoS requirements for user traffic . 93g310.2 Analysis and recommendations for Signalling QoS . 93g310.2.1 QoS requirement for the f
27、orward link signalling 94g310.2.2 QoS requirement for the return link signalling . 94g311 Simulation results and performance . 95g311.1 Simulation scenarios. 95g311.1.1 Channel model: Doppler Spectrum . 95g311.2 Performance in LOS channels 96g311.2.1 Forward link PER performance 96g311.2.2 Forward l
28、ink spectrum spreading performances . 98g3Annex A: Rate of Beam Roll-Off 100g3A.1 Basics . 100g3A.1.1 Rate of change 100g3A.1.2 Practical Example . 100g3Annex B: Continuous carrier mode vs. MF-TDMA mode comparison 102g3B.1 Introduction 102g3B.2 Hypothesis 102g3B.2.1 Satellite hypothesis . 102g3B.2.2
29、 Terminal hypothesis . 102g3B.2.3 Regulation constraints 102g3B.2.4 System Scenario definition . 103g3B.2.5 Return link budget hypothesis 103g3B.2.6 Traffic scenarii . 104g3B.3 Return link overall efficiency . 104g3B.3.1 MF-TDMA . 104g3B.3.2 Continuous Carrier spectral efficiency . 105g3B.4 Capacity
30、 Analysis . 106g3B.4.1 Methodology 106g3B.4.2 Capacity comparison results . 107g3B.4.2.1 ETSI Context (European scenario) . 107g3B.4.2.2 FCC Context (North American scenario) . 108g3B.5 Conclusions 110g3History 111g3ETSI ETSI TR 102 768 V1.1.1 (2009-04) 6Intellectual Property Rights IPRs essential o
31、r 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 Ess
32、ential, 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
33、. 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 Report (TR) has been produced by Joint Technical Committee (JTC) Bro
34、adcast 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 broadc
35、asting 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 whose wor
36、k 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 (Gene
37、va) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 Founded in September 1993, the DVB Project is a market-led consortium of public and private sector organizations in the television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television servi
38、ces. Now comprising over 200 organizations from more than 25 countries around the world, DVB fosters market-led systems, which meet the real needs, and economic circumstances, of the consumer electronics and the broadcast industry. Introduction The present document gives guidelines for the implement
39、ation of Digital Video Broadcasting (DVB) interaction channel for Satellite Distribution System (also known as DVB RCS: DVB Return Channel via Satellite) in mobile scenarios. DVB RCS specification i.1 describes several mandatory and optional features for geostationary satellite interactive system in
40、 mobile scenarios. Annex L of TR 101 790 i.3 already defines guidelines for some mobility scenarios characterized by Line-Of-Sight conditions with a channel that can be characterized as AWGN. This present document draws attention to the technical questions that need to be answered in setting up a DV
41、B RCS network that supports mobility in Line of Sight and Non Line of Sight scenarios in different channel conditions and offers some guidance in finding answers to them. The present document considers the DVB-S2 standard i.2 for the forward link transmission with the features to support mobility de
42、scribed in the DVB-RCS specification. ETSI ETSI TR 102 768 V1.1.1 (2009-04) 7Outline of the present document The present document provides some examples of implementation details related either with the physical layer (e.g. spreading, frame length, link budget), the link layer (MPE-FEC) or the mediu
43、m access control layer (e.g. use of continuous carrier operation versus MF-TDMA, handover). In order to ease the use of the present document, it shall be noted that from up to clause 8, the clause numbering is similar to the one used in EN 301 790 i.1. Clause 9 maps with clause 10 in EN 301 790 i.1
44、and clause 11 presents performance results based on simulations The present document only covers the extension to systems operating in mobile scenarios, guidelines for fixed scenarios are found in TR 101 790 i.3. ETSI ETSI TR 102 768 V1.1.1 (2009-04) 81 Scope The present document should be read in c
45、onjunction with EN 301 790 i.1 in order to assist network operators, systems integrators, and equipment manufacturers in the realization of satellite based interactive services in mobile scenarios. The present document should be interpreted as recommendations or good practices, but not as mandatory
46、requirements. It is anticipated, however, that future procurement documents may reference elements of the present document as part of their system specification. The present document is applicable to satellite systems as defined in EN 301 790 i.1 that target the provision of interactive services in
47、mobile scenarios (maritime, aeronautical, railway and land-vehicular). In such a system, the RCSTs receive a Forward Link signal based on the DVB-S2 (EN 302 307 i.2) specifications with the mobile extensions defined in EN 301 790 i.1. The system as defined in EN 301 790 i.1 may be used in all freque
48、ncy bands allocated to FSS or BSS services. 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 revisions do not apply. Non-specific reference may be made only to a complete docu
49、ment 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. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 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 referen
