Terrestrial Media Delivery Beyond DVB-T2

Transcription

1 Platzhalter für Bild, Bild auf Titelfolie hinter das Logo einsetzen Terrestrial Media Delivery Beyond DVB-T2 Ulrich Reimers, Madrid, 12 March 2013

2 What I want to talk about 1. DVB-T and DVB-T2 in Germany 2. A country without classical terrestrial TV? 3. Can cellular networks do the job? 4. A Tower Overlay over LTE-A 5. What shall we do with the UHF spectrum? 6. Conclusion 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 2/20

3 In Germany, classical terrestrial TV still uses DVB-T Mio. HH In %: IPTV DVB-T Satellite Cable Federal State DVB-T: between 3,0 % (SL) and 25,6 % (HB) Source: Digitalisierungsbericht March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 3/20

4 Our field trial with DVB-T2 in North Germany concluded that there are three scenarios how DVB-T2 could be introduced Szenario 1: Concentrate on portable and mobile reception. The net data rate is sufficient for 7 to 8 SDTV programs per channel Szenario 2: Deliver SDTV+ to stationary, portable and mobile receivers The net data rate is sufficient for 7 to 8 SDTV+ programs per channel. Alternatively, a mixture of HDTV and SDTV+ is possible Szenario 3: Concentrate on stationary HDTV receivers The net data rate is sufficient for 3 to 4 HDTV programs per channel In scenarios 1 and 2, the cost per program could be halved in comparison to DVB-T today But: DVB-T2 would require new receivers 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 4/20

5 Coming soon We donated a translation of the key sections of the final report of the field trial to DigiTAG for distribution to its members The report presents the results of field tests of even the most esoteric features of DVB-T2 such as: Multiple Physical Layer Pipes (MPLP) Rotated Constellations Time interleavers of different lengths Multiple Input Single Output (MISO) Portable reception In-car reception 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 5/20

6 In January 2013, RTL anounced that they will stop broadcasting DVB-T. RTL is the most important commercial broadcaster Other commercial broadcasters will decide by the end of March and may follow RTL The DVB-T audience even in the metropolitan areas will only receive public broadcast programs (? RTL will stop on 31 July 2013 in Munich, on 31 Dec in other regions) The audience will migrate to cable, satellite and/or IPTV The number of DVB-T customers will probably decrease sharply DVB-T2 in Germany? Forget it Eventually, even the public broadcasters will have to ask themselves: Is DVB-T still economically viable? 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 6/20

7 In January 2013, RTL anounced that they will stop broadcasting DVB-T. RTL is the most important commercial broadcaster Germany will become very popular (?) in the world of broadcasting. Is the German development going to initiate a domino effect? For portable and mobile reception (e.g. in cars) classical Live TV will no longer exist The UHF spectrum can be allocated to other uses in the medium term. International frequency co-ordination will be even more fun than in the past The broadcast network operators will be faced with signficant challenges Radio broadcast alone will have to pay for all the broadcast infrastructure such as towers and sites 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 7/20

8 In January 2013, RTL anounced that they will stop broadcasting DVB-T. RTL is the most important commercial broadcaster The various regulators (media and telecom) will have to think about creating qualitative and quantitative obligations for the new users of the UHF spectrum What about a must carry of Live TV on cellular networks? But before we start talking about obligations: Will there be an interest in the future to watch Live TV on Tablet PCs and other portable devices outside your own appartment? Remember: DVB-T will no longer be there By the way: In 2012, 4.4 mio. Tablet PCs were sold in Germany and for 2013, the industry expects more than 5 mio. 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 8/20

9 What I want to talk about 1. DVB-T and DVB-T2 in Germany 2. A country without classical terrestrial TV? 3. Can cellular networks do the job? 4. A Tower Overlay over LTE-A 5. What shall we do with the the UHF spectrum? 6. Conclusion 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 9/20

10 If LiveTV on Tablet PCs and other portable devices is required, then: One or more of the following network technologies will have to do the job: WiFi for all of us, this is an extremely important delivery network technology based on a fixed Internet connection. WiFi experiences congestion in many built-up areas Unfortunately, regulators and operators of infrastructure networks seem to ignore the technology Our system Dynamic Broadcast generates dynamically available WiFi spectrum With TV White Spaces more spectrum can be generated but if there is no more TV? UMTS / Long Term Evolution (LTE) in unicast mode LTE with embms (evolved Multimedia Broadcast Multicast Service) A Tower Overlay over LTE 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 10/20

11 evolved Multimedia Broadcast Multicast Service (embms) evolved MBMS is not yet in operation, but it was demonstrated several times for instance at the Mobile World Congress Verizon seems to introduce it in the US A lot is being published about embms for instance by Ericsson. Practical experience is missing. We hope to be testing it in Germany soon With embms up to 60% of the ressources of a carrier can be allocated to a broadcast mode. The remaining 40% are used for unicasting embms requires the network to operate at a robust and rather inefficient mode since all user terminals will have to be reached even those at the cell edge embms is specific to the cellular network of each operator. In Germany, this may lead to four parallel embms services delivering identical Live TV? 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 11/20

12 LTE in unicast mode why not go for such a solution? LTE is being rolled out as we speak. It is a wonderful system The number of LTE users is still quite limited and there is not a lot of experience with its performance in heavy traffic LTE flat rates are unknown in Germany. Volume tariffs with monthly limitations between 10 GByte (@ 43,95) and 30 GByte (@ 69,95) are available 10 GByte: 9 hours of 2.5 Mbit/s per month. Nothing else. In our recent study for the Federal Ministry of Economics and Technology we evaluated the capabilities of LTE assuming that LTE in unicast mode could be the solution of choice for delivering media content to people not only in metropolitan areas but even in rural regions 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 12/20

13 In Germany, the regulator wants everyone to be connected at 50 Mbit/s. Can LTE help? My colleagues in our department Mobile Radio Systems simulated a complete LTE network as follows: 19 enodeb (3 sectors each) in a hexagon grid Variation of the intersite distances from 500 m to 10 km Spectral efficiency 1,5 bit/s/hz (LTE Rel. 8 SISO) Calculation of path loss according to Okumura-Hata including an additional penetration loss of 20 db (TR Table A ) For the interference calculation we assumed that all ressource blocks of the neighbouring cells are busy We assumed 20 concurrent users per km 2 (rural areas in Germany are defined as having less than 150 people/km 2 ) For each scenario we generated 1000 snapshots for which the locations of the users were distributed randomly in the cell area 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 13/20

14 Example 1: Intersite distance only 500 m ISD 500 m Mbit/s P50 P40 P30 P20 P10 P5 P3 Perzentil P2 P Bandbreite Bandwidth [MHz] In order to deliver 50 Mbit/s to 20 concurrent users per km 2 on 50% of the locations inside the cell (perzentil P50), 140 MHz of spectrum is required But who will build networks with an intersite distance of 500 m outside metropolitan areas? 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 14/20

15 Example 2: Intersite distance 2500 m ISD 2500 m, SINR + 10 db 6 Mbit/s P50 P40 P30 P20 P10 P5 P3 Perzentil P2 P Bandbreite [MHz] Bandwidth [MHz] Here we assume a more realistic intersite distance of 2500 m. We also assume that users will operate an antenna with 10 db gain. Using 140 MHz of spectrum, 20 users per km 2 can expect 7,5 Mbit/s on 50 % of the locations 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 15/20

16 An interim conclusion If Live TV to Tablet PCs and similar devices will be an issue in an era in which classical terrestrial TV no longer exists, we have no technology that has proven that it can take over Some relief can be found in the Cisco VNI Mobile study 2013: In % of the mobile traffic will be offloaded to WiFi or femtocells (but what about congestion there?) My assumption is that Live TV on Tablet PCs and similar devices outside the home will be an issue and that neither LTE in unicast mode nor embms will be the solution of choice probably less for technical reasons but more for business reasons of the cellular network operators This is why my team not only works on Dynamic Broadcasting but also on a Tower Overlay over LTE-A - in which DVB-T2 as an LTE-carrier plays an important role 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 16/20

17 Tower Overlay over LTE-A In contrast to LTE embms, which is based on the dense cellular infrastructure, broadcast services will be provided on a dedicated carrier via a tower overlay LTE- A P2MP Point-to-multipoint The overlay becomes part of the LTE-A network by means of LTE-A carrier aggregation to ensure simultaneous reception of unicast and broadcast services The idea is for network operators to agree on a single overlay Secondary Carrier 10 MHz e.g. 700 MHz P2MP LTE-A cells: unicast services P2MP-Overlay: broadcast, multicast Primary Carrier 10 MHz e.g. 2.6 GHz LTE Carrier Example for non-contiguous carrier aggregation f 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 17/20

18 Tower Overlay for LTE DVB-T2 acting as LTE carrier By using the DVB-T2 Future Extension Frames we offer a solution for a time multiplex of DVB-T2 broadcast content and LTE P2MP services with variable ressource allocation up to the point where no broadcast content remains f LTE Local Unicast carrier e.g MHz DVB-T2/P2MP carrier e.g. 700 MHz DVB-T2- Modulator LTE- Modulator Hybrid Modulator T2-Data LTE- P2MP T2-Data FEF- P2MP T2-Data FEF- P2MP cross carrier signaling T2-Data FEF- P2MP t 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 18/20

19 ... But will there be spectrum left for such an approach? For Germany, we developed a number of band plans (with and without DVB-T2) This a band plan for the whole UHF band including some room for a Tower Overlay (size to be defined later) but no more spectrum for classical terrestrial TV 470 MHz 480 Mobilfunk 50 MHz UL MHz 530 Mobilfunk 50 MHz DL PMSE 26 MHz MHz 614 PMSE 20 MHz... PMSE: Program Making Special Events BOS: PPDR (Public Protection and Disaster Relief ) Mobilfunk: LTE networks... PMSE 26 MHz MHz 614 PMSE 20 MHz 634 Tower- Overlay 16 MHz 650 Mobilfunk 50 MHz UL BOS 15 MHz UL 10 MHz 725 Mobilfunk 50 MHz DL BOS 15 MHz DL Mobil DL... MHz March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 19/20

20 Conclusion Classical terrestrial broadcast plays an important role in many countries but no longer everywhere Whereas stationary TV receivers can easily be connected to cable, a satellite dish or broadband internet, portable and mobile receivers require wireless connectivity Will a world without classical terrestrial TV require Live TV on portable and mobile receivers outside the reach of a personal WiFi network? If so, then there is no technology which has proven that it can do the job We offer a Tower Overlay over LTE-A as one possible solution 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 20/20

21 Thank you very much for you interest in my talk. And thank you very much to my colleagues at home for their excellent contributions Prof. Dr.-Ing. Ulrich Reimers 12 March 2013 U. Reimers Terrestrial Media Delivery Beyond DVB-T2 21/20