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INDIA’S FIRST TETRA NETWORK by Delhi Metro Railway Corporation(DMRC)
TETRA Delhi Seminar September 2008
Prashant Rao Chief Signal & Telecomm Engineer
Delhi Del hi – the nee need d for for a mass mass tra transi nsitt system system • As cities grow in size, the number of vehicular trips on road system goes up. This requires a pragmatic policy shift to discourage private modes and encourage public transport. • Delhi has experienced phenomenal growth in population in the last few decades. Its population has increased from 6 million in 1981 to almost 15 million today. • For want of an efficient mass transport tr ansport system, the number of motor vehicles had increased from 0.5 million in 1981 to more than 4 million today. • The result is extreme congestion on Delhi roads, ever slowing speeds, increase in road accidents fuel wastage and environmental pollution with motorized vehicles alone contributing to about two thirds of the atmospheric pollution.
DMRC today • DMRC was then given a mandate to construct >50 kms of Metro Rail tracks in Delhi by 2005 • Work started in 1998, and the first section of Line 1 opened on 25 Dec 2002 • DMRC today consists of 3 operational lines, which concluded the Phase1 of the Project • Proven to be a tremendous success in meeting its aims of reducing road congestion, stimulating economic development within the proximity of the stations . • The success of Delhi Metro has inspired greater support for mass transit systems in India (e.g. Mumbai, Bangalore, Hyderabad)
DMRC phase 2 lines - by 2010
Metro Rails Major Building Blocks
• The Structures-Stations, Tunnels, Elevated Via-Duct • The Rail Track • The Rolling Stock • Electrical Systems- Traction and Low Voltage Supply • Train Control & Signaling Systems • Telecommunication Systems • Ticketing Systems
Radio system Requirement
• Train to Controller Communication • Operations & Maintenance Personnel • Security Staff
Why TETRA • TETRA was selected as the radio technology for the following reasons: – Open Standards • • • •
Guaranteed minimum performance (~ 500 ms setup time) Provides evolutionary growth Sourcing from more than one vendor Competitive pricing
– Frequency efficient – Group & Private Call – Integrated voice and data – Full Duplex – Resilience • Site Trunking • DMO
DMRC Radio System •
Operational from 2002
• Digital Trunked Radio System operating in 380-400 MHz conforming to ETSI TETRA standard – – – –
Calling of Train by Train Identity Number (TID) Customized GUI Screen for Dispatch Operator Train Radio Control Panel for train drivers Interfaces to other Telecommunication Subsystems • • • •
FOTS (fibre optic transmission system), PA (public address), EPABX TC&S (Train Control & Signalling).
• Thales (Line 1&2) and Siemens (Line 3) supplied the telecommunication system including the radio system. – Motorola was selected as the sub-supplier to provide the TETRA integrated digital radio system for these Lines.
• Further for Phase 2 Network also Motorola is contracted to supply the TETRA radio system for the upcoming 100 km
System Sizing • Phase 1 – Central Network Equipment (SwMi) at Master Site – 15 Radio Base Stations – 12 Customized GUI Dispatchers – 120 Trainborne Mobile Radios • Mobile Radio, Train Control Interface, Radio Control Panel – 60 Fixed Radios • Standard Mobile Radio installation – 500 Portable Radios
Phase 2 – Standby Central Network Equipment (SwMi) – 19 Radio Base Stations – 17 Customized GUI Dispatchers – 248 Trainborne Mobile Radios • Mobile Radio, Train Control Interface, Radio Control Panel – 122 Fixed Radios • Standard Mobile Radio installation – 600 Portable Radios
Radio Dispatch sub-system • The radio dispatch application was customized according to DMRC’s operational requirements. • The development of application is based on Application Program Interfaces • The required functionalities are performed from the customized GUI of the dispatch terminals. Key functions include: – Calling of trains by their assigned Train Identity Number or RakeID – Full duplex private calls between Dispatcher and Train Drivers. – PA announcement to trains from Dispatcher at OCC.
Trainborne equipment • Implemented in front and rear cab • Operating in main and standby • Direct PA announcement from OCC to train passengers
Radio Panel
Handset
Display
– In case of Emergency (e.g. driver incapacitated), Controller can make direct announcement inside Train – Implemented by interfacing onboard radio to on-board PA • Radio to station PA announcement – In Emergencies - Portable to Station PA announcement facility (Fire, Evacuation, etc) – Good quality Voice due to inherent improved quality of TETRA – Can select a Particular Station Number and a particular Zone – Implemented by radio Interface to EPABX and further EPABX interface to PA
Trainborne Radio Equipment Architectur TRIU MR
MR CPU
TRIU CPU
TRCP
TRCP I/O
I/O
DC/DC
DC/DC
Fall Back Link •
Trainborne Radio Equipment consists of Mobile Radio Train Radio Control Panel Train Radio Interface Unit
•
Implemented in the Front and Rear cab
•
Fall Back connection to Rear cab
•
Operating in the standby mode to the Front cab
Radio Coverage in Underground
• Is by Leaky Coaxial (LCX) Cables and Indoor Antennas • Bi-directional Amplifiers(BDA)/ RF-Optical Repeaters provided at every station ,feeding cables into tunnels and station areas. • LCX cables are also provided of GSM/CDMA operators for Mobile coverage
Further ext
Station1
Station2
Station 3
BDA
CN
Station N
BDA
BDA PS
BDA
BDA DC Blocs
DC Blocs Station Network
BTS
BDA DC Blocs
Station Network
Station Network
Power Splitter 1:2
Radio CNE
Radio Tower (50 m)
Remote Base Station (BTS)
STATION RADIO PHONE
Conclusion • TETRA communication system has been implemented successfully • The signals are clear • The voice clarity is excellent • The TETRA technology effectively meets DMRC’s operational and functional expectations
