Download - Lt Erail Critical Comms
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LTE for critical communications
in rail.
How and when?
Iain Sharp – Director, Netovate
@netovate
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Ancient
History
* in telecoms terms
*
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between expectations
and reality
-R
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• Critical communications/public safety
communications evolution outside rail
• Applicability to rail
• Rail industry actions
Structure
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Benefits of vast success:
• Huge R&D investment and innovation
• Network capacity
• High speed, multimedia
But:
• Not optimized for critical communications
• (Generally) no strong coverage obligations
Commercial cellular
Image: Sascha Pohflepp
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Features:
• Robust
• Excellent group operation
• Priority control
• Direct mode
But:
• Expensive due to limited
volume
• Slower evolution than
commercial cellular
Critical communications
..etc…
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Vision
Critical
Communications
Consumer Commercial
Rail
Critical
Comms?
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Commitment to LTE
National Public Safety
Telecommunications Council
Spectrum and US$7bn funding for national US
public safety network at 700MHz
Started standards process in 3GPP
Tetra + Critical Communications Association
Committed to LTE for broadband critical
communication systems
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Public safety scope in 3GPP
Radio Layer Features
Frequency band/Power support
High speed rail support
Radio enablers for system features
System Features
Proximity services (ProSE)
Group call on LTE enablers (GCSE_LTE)
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• Devices in close
proximity communicate
directly
• Reduce network load
• Increase radio efficiency
• Communication in areas
without network coverage
Proximity services
Coach – Coach
Shunting, Depots
Critical
communication
only
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Group calling enablers
Dispatcher
Cell
Site
Group
Members
Proximity Service
Relay
Cell
Site
Group Call Enabled
LTE Network
Group Call
application
sever
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3GPP Release 12 roadmap
2013 2014 2015
June
Requirements freeze
(Postponed from March
for public safety work)
December
Architecture freeze
June
Signalling freeze Release 12
Implementations
available?
Requirements
Architecture
Protocols
Bug fixing
Later phase enhancements….
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Application/enabler split
Critical Communications
Network Application
Critical Communications
Handset Application
3GPP LTE
Network Layers
3GPP LTE
Handset Layers
Open
Interface
Open
Interface
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GSM-R/ERTMS architecture
• Interface is implicit and GSM-R dependent
MORANE /
EIRENE
GSM-R
Voice
ERTMS MORANE /
EIRENE ERTMS
GSM-R
Voice
GSM-R
Data
GSM-R
Data
Operational &
Critical
Voice
Signalling
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Open architecture
MORANE /
EIRENE
“Rail Enabled” Radios
GSM-R / LTE / Other
ERTMS MORANE /
EIRENE ERTMS
“Rail Enabled” Radios
GSM-R / LTE / Other
Network
Interface Mobile equipment
Interface
• Technically viable
• Derisk future radio technology changes
• Enables common platform for safety critical and non safety critical apps
Operational &
Critical
Voice
Signalling
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What is a rail enabled radio?
Voice Data
Group calling Yes
Functional
addressing
platform
Yes
Direct mode Yes ?
High speed train
support
Yes Yes
Priority services Yes Yes
In other words, the LTE
critical communications requirements!
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• Spectrum
• Regulation
• Product end of life
• New build
• Critical broadband apps
(CCTV)
Transition triggers
Beyond our control
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BUT
• Open interfaces decouple apps
from infrastructure
• Don’t need dedicated radio
network
• Lots of questions arise
• Utilizes 3rd party spectrum
Use commercial networks
Cab radio
NOT REAL!
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On train system
Radio Modules
MORANE /
EIRENE ERTMS
User WiFi
IP Bus
Security
… etc.
Comms Gateway
Operational &
Critical
Voice
Signalling
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Critical comms, multi radio LTE
GSM-R
Track side
• Transition scenarios
• Adapt to local circumstances:
• Spectrum
• Physical geography
• Human geography
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• Not ready to influence LTE technology
• Define GSM-R lifecycle: regionally, nationally
• Given realistic spectrum assumptions
• Understand what LTE can deliver for
operational/critical communications
• Evaluate commercial networks use
Rail industry actions
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• LTE standards for critical communications also enable GSM-R like applications
• Becoming available from 2014….
• Decoupling applications from radio network infrastructure is technically desirable
• GSM-R is not forever!
Take away
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• www.3gpp.org/Public-Safety
• Netovate training event in December,
See: netovate.com
More information
Iain Sharp
Director, Netovate
• Cellular applications consultancy
• Training