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Terrestrial Trunked Radio (TETRA) (formerly known
as Trans-European Trunked Radio) is a professional mobile
radio and two-way transceiver.
TETRA was specifically designed for use by government
agencies, emergency services for public safety networks, rail
transportation staff for train radios, transport services and
the military.
TETRA is an European Telecommunications Standards
Institute (ETSI) standard, first version published in 1995.
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TETRA is the first truly open digital PMR standard.
TETRA standard contains high functionality forEmergency services.
Provides individual, group and direct modecommunications between radios.
TETRA provides Voice and Data Services.
Packet data and fast data transfer services.
380 - 400 MHz for public safety systems.
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TETRA has some unique features:
Directpush-to-talk (PPT), to groups and with priority setting
Centralized call control, for priority and queuing Direct mode, portable to portable without central radio
coverage (DMO)
Relay mode, one portable can use another mobile device to
link to the central radio Use of one or several timeslots for (low speed) Data
Voice encryption, different algorithms available
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Fleet Management
Automatic Vehicle Location (AVL) via GPS
Wireless Database Enquires
Wireless Internet
SCADA applications
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Mobile Radio
(Group, Individual,
Priority,
Emergency, DMO)
Mobile
Telephony
(FullDuplex
Voice)
Mobile Data
(Status
Messaging, SDS,Packet Mode,
Circuit Mode)
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1.Voice
Excellent voice quality Fast call set-up Individual (one-to-one) calls Push to Talk (PTT)
group calls scanning of groups dynamic regrouping
group area selection broadcast groups Emergency calls Secure encrypted communications
Direct Mode Operation (DMO)
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2.DMO DMO Terminal to DMO Terminal
Dual Watch (DMO/TMO)
Mobile DMO Gateway (Example Shown)
Mobile DMO Repeater
Mobile DMO Repeater/Gateway
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1. Over the Air TETRA Encryption Algorithms(TEAs)
TEA 1: European commercial Use TEA 2: EU public Safety organizations TEA 3: Public safety organizations outside EU
TEA 4: Commercial organizations outside EU
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2.End to End Encryption
The Advanced Encryption Standard (EAS) isthe defaultinteroperability algorithm for end-to-end
encryption The International Data Encryption Algorithm(IDEA) is also astandard encryption solution
The TETRA standard is also able to supportencryptionmodules that are required by specificorganizations and nations
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3.Encryption keys
Multiple keys are supported in the TEA
standards toallow different organizationsuse the same encryption algorithm buthave their own unique key to preventeavesdropping Keys can be static and/or dynamicdependent onsecurity needs.
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Multi-carrier
platform with TDMAcarriers
Adaptive
selection of
modulation and coding
according to
propagation
Conditions
Turbo coding
together with thechosen parameters
provides highly
efficient channels
Channel
Type
Modulation
25 kHz 50 kHz 100 kHz
/4 DQPSK 36
/8 D8PSK 54
4-QAM 38 77 154 230
16-QAM 77 154 307 461
64-QAM 115 230 461 691
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The much lower frequency used gives longer range, thuscutting infrastructure costs.
High spectral efficiency - 4 channels in 25 kHz and no guard
bands, compared to GSM with 8 channels in 200 kHz andguard bands.
Very fast call set-up - a one to many group call is generally
set-up within 0.5 seconds.
Works at high relative speeds >400 km/h.
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Requires a linear amplifier to meet the stringent RF
specifications that allow it to exist alongside other radio
services.
Handsets are more expensive than cellular.
Data transfer is efficient and long range (many km), but slow
by modern standards at 7.2 Kbits/ per timeslot.
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TETRA also provides a point-to-point function that traditional
analogue emergency services radio systems did not provide.
TETRA is built to do one-to-one , one-to-many and many-to-many and are directly relevant to the public safety and
professional users.
Rapid deployment (transportable) network solutions areavailable for disaster relief and temporary capacity provision.
Recommended