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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.

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