 Deliverable D2.1
Deliverable D2.1
Report on DVB-NGH System architecture
29th March 2012
Editor: Tero Jokela
University of Turku, Finland
Executive Summary
In ENGINES work package two (WP2), individual system architecture components are studied, and the results from these studies are forwarded to standardization work (DVB-T2 Lite, DVB-NGH). Additionally there is work on overall architectures, especially issues not covered by direct standardization that are novel access technologies and end-to-end system integration.
WP2 can be further divided into three main directions: system concepts and receiver algorithms for DVB-NGH, novel access technologies such as hybrid networks and cognitive radios and end-to-end system integration.
This deliverable collects the system architectural work performed by ENGINES partners for the DVB-T2 Lite and DVB-NGH. The topics considered here are:
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T2-4-NGH proposal
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Definition of ”T2-Lite”
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“Flexible Time Division Multiplex based on DVB-T2” proposal
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Proposal of a DVB-T2 Future Extension Frame based on 3GPP LTE broadcast mode (E-MBMS) for DVB-NGH
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Proposal of a NGH satellite Super Frame structure
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NGH Hybrid network architectures
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System Architecture Proposals for DVB-NGH Integrating MIMO Schemes
The advanced component techniques that have been devised or refined in order to solve fundamental issues for reaching required capacity and performance for DVB-NGH are presented in deliverable 2.3. “Report on advanced concepts for DVB-NGH”.
Table of Contents
1Introduction 6
2T2-4-NGH proposal 6
2.1General overview 6
2.2System architectural model 7
2.3Overview of the NGH protocol stack 9
2.3.1OMA-BCAST 10
2.3.2Encapsulation and multiplexing 10
2.3.3Signalling 10
2.3.4DVB-NGH physical layer 11
2.4Network elements and interfaces 11
3Definition of ”T2-Lite” 11
4Flexible Time Division Multiplex based on DVB-T2 13
4.1Rationale of the system concept 13
4.2NGH as a flexible “Time Division Multiplex” 14
5The CORE T2 service carried in one category of DVB-T2 frame, 14
6“Something else” carried in the “Future Extension Frame” (FEF). 14
6.1Is a unique “DVB-NGH frame” able to satisfy every CR needs? 15
6.2A set of NGH-Frame to optimise NGH-Services 17
6.3Conclusion 18
7Proposal of a DVB-T2 Future Extension Frame based on 3GPP LTE broadcast mode (E-MBMS) for DVB-NGH 18
7.1Use cases 18
7.2E-MBMS overview 19
7.2.1Spectrum allocations 19
7.2.2Duplex modes 19
7.2.3Frame structure 19
7.2.4Downlink parameters, resource definition and allocation 19
7.2.5Channel coding 21
7.2.6Constellations 21
7.2.7Synchronisation, sounding and signalling 21
7.3Performance overview and comparison with DVB systems 23
7.3.1Coverage 23
7.3.2Time interleaving 23
7.3.3Doppler resistance 23
7.3.4Channel estimation limits 23
7.3.5Throughput 25
7.4E-MBMS embedded in DVB-T2 FEF 25
7.4.1Bandwidths 25
7.4.2Frame size 25
8Proposal of a NGH satellite Super Frame structure 26
8.1Future extension frame for the satellite component 26
8.2DVB-T2 Super Frame structure 26
8.3Description of the proposed NGH Super Frame structure 26
8.4Mixed T2/NGH terrestrial Super Frame 27
8.5NGH satellite Super Frame 28
8.6Super Frame modification management 28
8.7Conclusion 29
9NGH Hybrid network architectures 29
9.1Hybrid network frame structure 30
9.2Hybrid SFN network 34
9.3Hybrid MFN network 36
9.4Hybrid network configurations 39
10System Architecture Proposals for DVB-NGH Integrating MIMO Schemes 40
10.1Single-tower MIMO Transmission 41
10.2Distributed MISO Transmission 41
10.3Two-tower MIMO Transmission 42
10.4MIMO Architecture including Satellite Link 43
11Summary 43
12References 44
List of Contributors
The following ENGINES members, listed in alphabetical order, have contributed to this deliverable:
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BBC
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CNES
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DiBcom
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Hispasat
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INSA-IETR
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MERCE
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Nokia
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Orange Labs/France Telecom
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Teamcast
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Telecom Bretagne
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Teracom
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Thomson Broadcast
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Universidad Politécnica de Valencia/ iTEAM
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University of Turku (as editor)
1Introduction
Most of the early work performed towards the definition of the new DVB-NGH system was dedicated to the definition of an overall architecture for the system. All the devised architectures assume that DVB-NGH services should be deployable on an existing DVB-T2 network infrastructure. In addition to terrestrial network, an optional satellite component for the DVB-NGH is considered. In this deliverable, the architectural studies and proposals made by ENGINES partners are presented.
The T2-4-NGH proposal, described in Chapter 2 is mainly a subset of DVB-T2, suited for mobile reception with an optional satellite component, inspired from the DVB-S2 [1] or DVB-SH [2] standards. This proposal was partly used for the definition of the so-called ”T2-Lite” profile of DVB-T2, intended primarily for reception of broadcast services in mobile environments (see Chapter 3).
The “Flexible Time Division Multiplex based on DVB-T2” system concept described in Chapter 4 takes advantage of the Future Frame Extension (FEF) concept embedded in DVB-T2 to alternate transmissions of several type of waveforms, each optimised for a specific population of receivers. A set of frames is designed to serve efficiently several network structures (broadcast, wireless broadband, mobile telecommunications networks).
Based on the DVB-T2 structure, two particular NGH frame structures have been studied. Chapter 7 deals with embedding a 3GPP E-MBMS frame in a DVB-T2 FEF, which could be seen as the cornerstone of the convergence of the E-MBMS and NGH mobile broadcasting standards. Section 8 presents a super frame structure, compliant with both terrestrial and satellite requirements, and based on a flexible position of NGH frames to address terrestrial mixed T2/NGH transmission and NGH-only transmission.
Hybrid satellite-terrestrial network scenarios for DVB-NGH are presented in Chapter 9. Frame structures envisaged for hybrid networks are considered. Also the concepts of SFN and MFN hybrid network and their constraints are described. Finally, in Chapter 10 MIMO network architectures for DVB-NGH are presented in detail.
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