Overview of TETRA Functionality

Presentation on behalf of the TETRA + Critical Communications Association

Robert Jastram

Director, Americas, 3T Communications

1

Overview of TETRA Functionality


Mature and proven Standard

Implemented by largest number of system, terminal, accessory and application OEMs

With certified interoperability

Fast, Spectrum efficient, secure, reliable & resilient,

And a rich functional feature set

To serve demanding critical communication users . . .

What is TETRA?


Content

TETRA Basics

Security

Resilience

Modes of Operation

Functionality:

Basic Services

Supplementary Services

Data Services


TETRA Basics

300ms


TETRA Basics

25KHz Carriers 4 slots per carrier 32 comm Paths/200KHz

12.5KHz Channels 1 dedicated Control Ch 15 comm Paths/200KHz

25KHz Channels No trunking 8 comm Paths/200KHz

TDMA Based Modulation: p/4 DQPSK @ 36 kbit/s

4 Channels TDMA per 25 kHz Carrier

Control Channel Based

Capacity 4 Voice Channels per 25 kHz channel

4 Data Channels (total data rate: 28.8 kbit/s) per 25 kHz channel

Simultaneous Voice and Data - No interruption of essential data by

voice transmissions

- No need to build separate data system

200KHz Bandwidth

6.25KHz per talkpath


Multi-layer Security


Resilience/Redundancy Schemes

Repeater and switch internal redundancy Transmission link redundancy Base station fallback Standalone switching center Network management/dispatch

redundancy

Direct Mode


TETRAs Rich Feature set


TETRA Modes of Operation

5. DMO Gateway

DMO Channel

Trunked Channel

3. Dual Watch

2. DMO

4. DMO Repeater

1. TMO


Key Voice Services and Facilities

Radio Identification Group Call Pre-Emptive Priority Call (Emergency Call) Call Retention Priority Call Busy Queuing Direct Mode Operation (DMO) Dynamic Group Number Assignment (DGNA) Ambience Listening & Discrete listening Call Authorised by Dispatcher Area Selection Late Entry Voice Encryption


Additional Voice Services

Acknowledged group call

Broadcast

Access Priority

Priority Call

Talking Party Identification Individual call (Full

and Half duplex) Telephone

Interconnect (Full duplex)

Barring Incoming Calls

Barring Outgoing Calls

Short Number Addressing

Calling Line Identification Presentation

Calling/ Connected Line Identification Restriction

Connected Line Identification Presentation

Advice of Charge

Call Completion to Busy Subscriber

Call Completion on No Reply

Include Call

Call Report

Call Forwarding on Busy

Call Forwarding on No Reply

Call Forwarding on Not Reachable

Call Forwarding Unconditional

List Search Call

Transfer of Control

Call Waiting

Call Retention

Call Hold


Data Features

Data bandwidth on demand

- wide range of data rates available Status service

16 bit integer data, fixed length 32768 values free for application use Fast delivery with minimum load to radio path Group addressing

Short Data service, SDS 4 types of SDS messages. 16/32/64 bits and 126 bytes. Fast delivery (less than 0.5 sec), small load to radio path Group addressing SDS-TL, Transport layer

IP Packet Data Standard TCP/IP protocol layer (winsock) for applications Fast connection setup Economic radio path usage automatic disconnection at inactive periods


Recap

Fast

Proven

Spectrum Efficient

Interoperable

Secure

Mature

Resilient

Feature Rich


Audio

Norway-TETRA_Test.wmv


Any questions ? Thank you

Overview of TETRA Functionality

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