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Proprietary and confidential. | 1
Connecting What’s Next
Connecting What’s Next
LTE Mobile Offload using DVB-T2 LS Telcom Summit 2015
10th June 2015 Lichtenau, Germany
Proprietary and confidential. | 2
Connecting What’s Next
About Gatesair GatesAir is former Harris Broadcast
US based company with unparalleled reliability for nearly 100 years
provides world-wide complete over-the-air Radio and Television solution supporting all TV & Radio Standards
High efficient, reliable, easy to serve premium quality for long term operation
Actively defining future of broadcasting as member of all large broadcast organization
www.gatesair.com
TV- - - - - - - - - - Transmitter - - - - - - Radio
DTMB FM, AM
CDR
IP Network
Audio over IP Studio
Proprietary and confidential. | 3
Connecting What’s Next
The Technische Universität Braunschweig’s Institute for Communications Technology specializes in System Theory and Technology of Electronic Media; Mobile Radio Systems and Digital Signal Processing
A combination of teaching and research is performed in Electrical and Electronic Engineering; Industrial, Electrical and Electronic Engineering; Computer Sciences; Computer Systems Engineering; Media Studies and Mobility and Traffic Engineering
The Institute currently employs 65 professors and staff, including 35 research assistants, many of which are financed via cooperative contracts with third parties spanning the globe.
www.ifn.ing.tu-bs.de/en/ifn/
About Technische Universität Braunschweig
Proprietary and confidential. | 4
Connecting What’s Next
Forecast for mobile data traffic
Increasing use of bandwidth from mobile phones
Studies from Ericsson and Cisco predict exponential growth of bandwidth need, driven largely from video consumption
Drivers i.e. are TV Anywhere and widely usage of tablet PC & smart phones
For Tablet PC using HEVC 1.4 Mbit/s required (1MB Video+ 0.4MB Audio)
1hour requires 630 Mbyte
1h every day requires 18.9 Gbyte/ month
http://www.cisco.com/c/en/us/solutions/collateral/service-provider/visual-networking-index-
vni/white_paper_c11-520862.pdf
Proprietary and confidential. | 5
Connecting What’s Next
If it comes to mobile & portable reception – which networks cando the job?
Terrestrial DTV
Limited success to include broadcast tuners in mobile devices failed
Remember MediaFLO and DVB-H
Experience shows that a separate DTV tuner seems to be “hard to do“!
The world of 3GPP and the world of broadcast still exist on different planets
WiFi
WiFi experiences congestion in many built-up areas, especially indoor
Cisco: ~ 30 % Wifi offloading today, ~ 50 % in 2018 important delivery technology
no predictable network with limited and fragmented coverage
UMTS / LTE
Long Term Evolution (LTE) in Unicast mode
Not with moderate costs
Proprietary and confidential. | 6
Connecting What’s Next
eMBMS = evolved Multimedia Broadcast Multicast Services
Point to Multi Point (P2M) broadcast and multicast in 4G LTE networks
Only 60% of LTE cell data rate can be used for eMBMS (6 of 10 Sub-Frames) because Unicast needs to be present too (fixed in the standard)
Bounded to cellular network structure (max. 10km cell size supported)
Allows Single Frequency Network (MBSFN) of multiple cells to cover larger areas
Carrier Aggregation up to 20MHz bandwidth for increased data rate
Interference protection needed on border of MBSFN area
For large areas it may become inefficient
Unicast;
Signaling;
Sync.;
Paging
#1
Broadcast/
Multicast
Service 1
#2
Broadcast/
Multicast
Service 1
#3
Broadcast/
Multicast
Service 1
#4
Unicast;
Paging
#5
Unicast;
Sync.;
Paging
#6
Broadcast/
Multicast
Service 2
#7
Broadcast/
Multicast
Service 2
#8
Broadcast/
Multicast
Service 3
#9
Unicast;
Paging
time
Is LTE eMBMS ready for this challange?
LTE Radio frame
LTE cell with P2P unicast
and P2MP eMBMS
MBSFN
Proprietary and confidential. | 7
Connecting What’s Next
Cellular networks will probably not be able to cope with the growing demand for data like live video and will not be efficient to distribute live video and audio @ 1.4 Mbit/s or more in thousands of networks cells and possibly by several mobile network operators in parallel
LTE Mobile Offload
Regular LTE cells, unicast P2P carrier
Overlay LTE Megacell, broadcast/ multicast P2MP carrier
Let‘s define a LTE Megacell overlaying the cellular network and broadcast
high power from high tower to mobile receiver.
Proprietary and confidential. | 8
Connecting What’s Next
What is LTE Mobile Offload (LMO)?
Technology envisioned / created by the Technical University of Braunschweig. Also known as “Tower Overlay”
GatesAir has partnered with TUB to commercialize
Basic idea is to offload popular services, especially live video, from cellular networks
Utilizes High Tower, High Power (HTHP) transmitter sites so that…
HTHP transmitter coverage “over-lays” the many existing cellular towers
HTHP transmitters are typically operated by network operators or broadcasters
Provide native (i.e. LTE signal) to existing mobile receiver
Can we use existing broadcast infrastrucutre i.e. DVB-T2 broadcast sites?
Proprietary and confidential. | 9
Connecting What’s Next
DVB-T2 Future Extension Frames (FEF, defined in the DVB-T2 Standard) enable time domain spectrum sharing with other wireless networks, e.g. a mobile access network
Re-use of DVB-T2 as existing wireless carrier
Tower Overlay with DVB-T2 using Future Extension Frames (FEF)
Technical Fundamentals
DVB-T2-Superframe DVB-T2-Superframe DVB-T2-Superframe
T2-Frame
#0
T2-Frame
#1
T2-Frame
#2
T2-Frame
#NT2 - 1 FEF FEF
P1 P2
#0
P2
#NP2 - 1
Data
Symbol #0
DataSym.
#Ndata - 1
…
…
P1 FEF Symbol
#0
FEF Sym.
#NFEF - 1 …
P2MP-Subframe #0 P2MP-Subframe
#Nsubframe - 1 …
time
Proprietary and confidential. | 10
Connecting What’s Next
LTE-A+ formatted content is inserted into a broadcast DVB-T2 multiplex using the FEF,
in a format that is native to the LTE device.
Technical Fundamentals – Hybrid Modulator
A hybrid modulator / exciter can therefore be realized that broadcast DVB-T2 to fixed (home) receivers while video over LTE can be broadcast to mobile receiver
DVB-T2
Data
DVB-T2
Data
DVB-T2
Data
FEF-
P2MP
FEF-
P2MP
FEF-
P2MP
Hybrid Modulator
DVB-T2
Data
LTE-A+
P2MP
DVB-T2-
Modulator
LTE-A+ P2MP
Modulator
Standard DVB-T2 content
Time multiplexed DVB-T2 and LTE-A+ signal
Proprietary and confidential. | 11
Connecting What’s Next
Hybrid Modulator
The LTE in-band signaling (via unicast network) instructs the LTE receiver that a P2MP LTE carrier exists that it can receive and decode at the broadcast frequency being used.
Proprietary and confidential. | 12
Connecting What’s Next
The carrier aggregation concept of LTE enables a solution for sharing of ressources by multiple network operators to gain the most benefit out of the LTE Mobile Offload Tower Overlay
LTE-MO sharing with multiple Mobile Network Operator
DVB-T2
Data
DVB-T2
Data
DVB-T2
Data
FEF-
P2MP
FEF-
P2MP
FEF-
P2MP
Hybrid Modulator
DVB-T2
Data
LTE-A+
P2MP
DVB-T2-
Modulator
LTE-A+
P2MP
Modulator P2MP carrier signaling
frequency
time
LTE P2MP carrier
…
…
Primary carrier (Operator 4) …
Primary carrier (Operator 3) …
Primary carrier (Operator 2) …
Primary carrier (Operator 1) …
…
Users from different network operators access the same content through proper signaling
Proprietary and confidential. | 13
Connecting What’s Next
LTE Mobile Offload - RF spectrum example
554 MHz
8 MHz (DVB-T2)
5 MHz (LTE-A+)
Time Multiplex of DVB-T2 and LTE content over one transmitter
Proprietary and confidential. | 14
Connecting What’s Next
Receive Devices Operate Normally
DVB-T2
Modulator DVB-T2
Data
LTE-A+
Modulator
FEF
LTE-A+
MU
X / T
ran
sm
itter
Modified LTE-A+ Device
LTE-A+
reception
unaffected
by DVB-T2
Signal !
DVB-T2
reception
unaffected
by LTE-A+
Signal !
Standard DVB-T2 TV
Reference: A Software Defined Radio based Implementation of the “Tower Overlay over LTE-A+” System, Daniel Rother, Stefan Ilsen, Frieder
Juretzek - Institute for Communications Technology (IfN) Technische Universitaet Braunschweig
Hybrid Modulator/Tx Transmission Path
Proprietary and confidential. | 15
Connecting What’s Next
Reduces significant the potential capacity gap
No new network build-out required.
No (or less) spectrum to pursue at auctions.
Relieve network congestion, especially in dense populated areas.
Pay-as-you-go or pay-per-use.
Launch new services
• e-book, e-magazine or e-newspaper downloads.
Mobile network operator still gets revenue from customer even though content is delivered “out of band”. The experience should be seamless to the user.
Benefits for Mobile Network Operators
Proprietary and confidential. | 16
Connecting What’s Next
New revenue stream via capacity lease / rent.
On demand or bits per unit time
Similar to datacasting business models
Expand reach to ever-growing nomadic viewing public with existing standards technology.
Create synergistic partnerships with mobile network operators.
Coverage within dense metro areas may be most important since there are fewer users outside of that where the broadcast signal strength is diminshed and the LTE network may handle the load with ease.
Benefits for Broadcast Network Operators
Proprietary and confidential. | 17
Connecting What’s Next
Mile stones to LTE-Mobile Offload with DVB-T2
Demonstrator
Future Zone Demonstrator
Gatesair Booth
Prototype Hybrid Modulator
Gatesair Booth
Live Test Paris
2015 Since 2015-04
Proprietary and confidential. | 18
Connecting What’s Next
On Eiffel Tower transmission of LTE-MO with DVB-T2
UHF Channel 54 (738 MHz, 8MHz)
Gatesair Transmitter 500W (2,7kW ERP)
LTE-MO reception to mobile & portable receiver (tablets, cars)
LTE-MO mobile coverage
Different modulation parameter for both T2 and LTE-MO
Different bandwidth share between T2 and LTE-MO (i.e. 50/ 50)
LTE- MO with DVB-T2 tests in Paris
Proprietary and confidential. | 19
Connecting What’s Next
Summary
The Concept of High Power High Tower Megacell has been developed at the Technische Universität Braunschweig in their Institute of Communications Technology (IfN).
The GatesAir and Technische Universität Braunschweig solution modulates the DVB-T2 and LTE-A+ signals, using a hybrid exciter platform and over-the-air transmitters to deliver simultaneous digital TV and LTE content to all devices from a traditional broadcast tower
This potentially eliminates cellular network congestion from multiple peer-to-peer connections, and instead uses the broadcaster's signal to deliver multi-user requested content — a win-win for broadcasters and mobile network operators!
Proprietary and confidential. | 20
Connecting What’s Next
Summary
The LTE Mobile Offload model is proven to work using the DVB-T2 broadcast standard today
Similar possibilities exist for incorporation into ATSC 3.0
Mobile operators can reduce costs while expanding reach and conserving bandwidth.
Broadcast operators can leverage existing infrastructure and spectrum and cultivate new revenue models and business relationships.
Consumers and the public benefit from optimal spectrum utilization and optimized services.
LMO maximizes the use of existing spectrum and revenue opportunities for both broadcasters (network operators) and telecom operators
Proprietary and confidential. | 21
Connecting What’s Next
Jens Stockmann Product Specialist Transmission
GatesAir
Thank you very much!