3. TETRA History
• Early 1990s – Proposal to ETSI
– Initially for shared commercial
– Later to include Public Safety user needs
• Mobile Digital Trunked Radio System (MDTRS)
• TErrestrial Trunked RAdio (TETRA)
6. Core Technology
• 4 slot TDMA in 25kHz channels
(6.25 equivalent)
• /4 DQPSK Modulation
• Gross data rate 36kbit/s, Net 28kbit/s
• Circuit and packet mode data
• Low bit rate ACELP codec (4.6kbit/s)
• Fast call setup <300ms typical
• Air Interface and End to End Encryption
12. dPMR
• Replacement for PMR 446
• Unlicensed bands
• Low Power (500mW)
• 6.25kHz channel spacing
• Set to Set only
• Suitable for on‐site, low functionality
systems
13. DMR
• Tier 1
– Un‐licensed, low power, set to set
• Tier 2
– Licensed set to set and set to base station
• Tier 3
– Licensed
– Simple trunked systems
14. DMR
• All tiers are 12.5kHz 2‐slot TDMA
• Basic functionality
– Individual Call (point to point)
– Group Call (point to multipoint)
– All Call (one‐way voice call to all users)
– Broadcast (one‐way group call).
• Limited standardisation
• Data typically 1.8kbit/s per slot*
* Source – Analysis Mason
18. ETSI Broadband Initiative
• Establishing
User Requirements
• Evaluating Technologies
• Joint Workshop with TETRA Association
19. Market Reach
• Currently not accessible
• Presence at IWCE
• Meetings with
TETRA now present in more than 100
– APCO countries
– NPSTC
• Pilot Systems are underway
• Utilities Telecom Council (UTC)
35. Airports
Amsterdam Cologne Heathrow
Cape Town
Doha Bangalore
Delhi
Paris Madrid
Oslo Beijing
Hyderabad
Barcelona Munich
Athens
Shanghai
Hanover Zaragoza
Suvarnabhumi
Brussels
Bangkok
Granada Jersey.
Malaga
Birmingham
Stuttgart
Hong Kong Leipzig.
Seville
Saltzburg Copenhagen