TETRA ARCHITECTURE AND INTERFACES

Dr. M. NouriNew Technologies Senior Manager

SELEX Communications&

Chairman of TC TETRA WG4

Agenda

1. TETRA Architecture and Standard Interfaces

2. Description of Individual Interface

– Network Aspects and Scenarios

– Services

– Protocols

3. TETRA Standard Gateways

– Features

4. Network Management System

5. Control Room Gateway

6. Conclusions

Typical TETRA Network

TETRAInfrastructure

.

Line Station (Despatcher)

BSBS BSBS

BSBS BSBS BSBSBSBSAnother TETRA

Network

NMS

1a

1b3

6

5

4

2

ExternalNetworkManagement

PSTN, ISDN PDN

Control Room

Air Interface (AI) Variants

DMODMOAIR I/FAIR I/F

PEIPEI

TMOTMOAIR I/FAIR I/F

TM V+D Air Interface Air Interface

Uplink

DownlinkV

D

D

V

V

V

D

D

V

TDMAFRAME

TS 2

TS 3

TS 4

TS 1

TS = Time Slot

TETRAInfrastructure

TM V+D AI Services

• Speech• Data

– Circuit mode– Packet mode– Short data service

• Supplementary Services• Call Control• Mobility Management• Security Services

Number ofTimeslots 1 2 3 4

NoProtection 7.2 14.4 21.6 28.8

LowProtection 4.8 9.6 14.4 19.2

HighProtection 2.4 4.8 7.2 9.6

BANDWIDTH ON DEMAND

TM V+D AI Data Rate Capacities

(kbit/s)

TM V+D AI Protocol Stack

Layer 3

Layer 1

Layer 2

• Packet Data

• Mobility Management

• Call Control• Short Data• Supplementary Services

• Speech• Circuit Mode Data

MM

Mobile/Base Link Control Entity

CMCE PD

USER PLANECONTROL PLANE

Logical Link Control

Medium Access Control

Physical Layer

Direct Mode AI Scenarios

1. INDIVIDUAL CALL 2. GROUP CALL

3. DUAL WATCH

NETWORK

AUTHORIZINGMOBILE STATION

4. MANAGED DIRECT MODE

4

NETWORK

Direct Mode AI Scenarios (contd.)

REPEATER

5. DIRECT MODE REPEATER

NETWORK

GATEWAY

6. DIRECT MODE GATEWAY

NETWORK

REP/GW

7. DIRECT MODE REPEATER/ GATEWAY

NETWORK

REP/GW/AUTHORIZING

MOBILE

8. MANAGED REPEATER/ GATEWAY

DM AI Protocol Stack

Layer 1

Layer 2

Layer 3

Physical Layer

Data Link Layer

Direct Mode Call Control

Short Data

Intrinsic Services

Call Control

CONTROL PLANE USER PLANE

Speech

Circuit Mode Data

Legend

SCN: Switching Control Node

NMS: Network Management System

BS: Base Station

Services Supported by ISI

Regional To other Local SCN

ISIISI

To Other Regional SCNTo other TETRA

Networks

Example: ISI Group Call Configuration

CONTROLLING ANDPARTICIPATINGNETWORK

PARTICIPATING NETWORK

ISI

ISI

REQUESTING ANDPARTICIPATING NETWORK

ISI : Protocol Stack

TETRA INFRASTRUCTURE 2

TETRA INFRASTRUCTURE 1

ITU-T Rec. X.229

ISO/IEC 11582

ISO/IEC 11572

TETRA ANF

ton

c TETRA operation

ITU-T Rec. X.229

ISO/IEC 11582

ISO/IEC 11572

Layer 1

ETS 300 402-1 and 2

PRIVATE SIGNALLING SYSTEM 1 (PSS1) USED IN ISI STANDARD

Specific TETRA Operation

ETS 300 402-1 and 2

Layer 1

TETRA ANF

Specific TETRA Operation

IP Inter-working Interface

BGBGGGSN GGSN

Internal BackboneInternal Backbone

Gi Gp Gi

Packet Data Network

Inter-Network Backbone

HDB VDB

TETRAInfrastructure 2

HDB VDB

Gn Gn

Host

ISI

TETRAInfrastructure 1

Peripheral Equipment Interface (PEI)

MT2

TE2

PEI

TETRAINFRASTRUCTURE

PEI Protocol Layers

PPP

IP

APPLICATIONS

TO MOBILE STATION

UDP/IP

AT TNP1Circuit

Mode DataPD

V. 24/V. 28

Standard API and Applications

WAP

IP Packet Data

AVL Telemetry

CircuitMode Data

Internet Access

Proprietary

TETRA ADAPTATION LAYER

SDS

Applications

Standard API

Bearer Service

IP and TETRA Network

Internet

IP Switching/Routing Network

TETRA Infrastructure

CorporateIntranet

IP

IP

IP

Voice/IP

WAPTerminal

WAP GW

GPS

Bluetooth

IP

IP

IP

IP

Network Management System

ControlRoom

Server

Dispatcher

IP

LANServer

Database

ContentProvider

PSTN Gateway

PSTNGW PSTN

ISDN Gateway

ISDNGW

2B+D30B+2D

ISDN

Network Management (1)(Internal)

AuthenticationCentreNMS Client

LAN

LAN

SCN

Server ServerDisks

21” 21” 21” 21”

15” 15”

NMS

ROUTERROUTER

ROUTERROUTER21” LAN

Client

Network Management (2) (external)

Types of NM Functions

• Performance Management

• Fault or Maintenance Management

• Subscriber Management

• Accounting Management

• Security Management

TETRA 1

TETRA 3

TETRA 2

ENMENM

NMSNMS

NMS

ISIISI

ISIISI

ISIISI

ControlRoom

Gateway

GPS

Dispatchers

GSM

TETRA

ICCS

AVL Controller

Internet

CorporateIntranet

PSTN / ISDN

LegacyRadios

Databases

• IT System• Call Logging• CCTV• Paging• Fax / Email• Voice Recording•Others

Control Room Gateway (1)

InternetServer

Control Room Gateway (2)

• Not standardized because of different applications requirements from different user sectors • Current trend is to include Flexible Application Programming Interfaces (APIs) to facilitate communication with the API client

• Management of following functionalities through API using API libraries or through messages :

• Audio parameters• Individual and Group Users• Supplementary services• Alarms

Gateway

Engine Gateway

Engine

API ClientAPI Client

Application Server

Application Server

To TETRA Switch Interface

To control room application client

Conclusions TETRA Architectures and Interfaces allow:• Spectrally-efficient feature rich communication• Choice of trunked or direct modes• Interoperability between different TETRA networks• Multimedia services and Internet access • Extensive data applications capability• Inter-working with public networks• Use of control room gateways in public safety and other

sectors