Dialling, Numbering & Addressing

Pieter der KruyffR&S BICK Mobilfunk GmbH

Agenda

• Definition of terms

• Dialling & Man Machine Interface (MMI)

• Addresses and Identities

• Numbering and Addressing

• Call Scenarios

Definition of terms(as used in this presentation)

DIALLING - Identity exchange mechanism between User and Terminal

ADDRESSING - Identity exchange mechanism over air- interface

NUMBERING - decimal representation of air-interface addresses as seen by the user i.e. user visible numbering

TETRA Dialling & MMI

Man-Machine Interface MMI - ETR 294

Full dialling

Mode keys

Soft keys

Display scrollingNumber presentation (CLI & TPI) with mnemonics

Special numbers e.g. 999/ 112

Leading Digit dialling - ETR 300-5

ID exchange between user and terminal

TETRA Addressing

MOBILE NETWORK ID SHORT SUBSCRIBER ID

SHORT SUBSCRIBER IDENTITY

(SSI)

MOBILECOUNTRY

CODE(MCC)

MOBILE NETWORK

CODE(MNC)

24 BINARY BITS7/8 DECIMAL DIGITS

10 BITS3/4 DIGITS

14 BITS4/5 DIGITS

24 BINARY BITS 24 BINARY BITS

Family of TETRA Addresses

(ITSI) INDIVIDUAL TETRA SUBSCRIBER IDENTITY

(ATSI) ALIAS TETRA SUBSCRIBER IDENTITY

(GTSIs) GROUP TETRA SUBSCRIBER IDENTITIES

HOME NETWORK

(V)ATSI VISITING ALIAS TETRA SUBSCRIBER IDENTITY

(V)GTSIs VISITING GROUP TETRA SUBSCRIBER IDENTITIES

VISITING NETWORK

TETRA Addressing Plan

X.121

ITU Recommendation X.121 Numbering Plan for Data Networks

E.212

ITU Recommendation E.212 Numbering Plan for Public Land Mobile Terminals, e.g. GSM

Numbering & Addressing

• Numbering and Addressing Plans• Basic Numbering• Enhanced Numbering• Leading Digit Dialling• 4 Scenarios

•Home & Foreign Network•PABX & E.164

Linking TETRA Addressing & Numbering

SHORT SUBSCRIBER IDENTITY

(SSI)

MOBILECOUNTRY

CODE(MCC)

MOBILE NETWORK

CODE(MNC)

3/4 DIGITS 4/5 DIGITS 7 / 8 DECIMAL DIGITS

TETRA ADDRESSTETRA ADDRESS

TETRA NUMBERTETRA NUMBER

How many numbers for a TETRA Terminal?

• One Family of Home Network TSIs•One Individual TETRA Number ITSI•One Alias of individual Number ATSI•One or more TETRA Group Numbers GTSIs

• One or more Families of Visiting Network TSIs •Unassigned SSI (USSI)•One Visiting Alias (V)ATSI•One or more Visiting Group Numbers (V)GTSIs

• One telephone number E.164.

Basic TETRA Number

• Communication within home TETRA Network• No need for algorithm selection• Home dialling algorithm applies

•decimal value range from 0 to 16,777,215 (224)•User may dial between 1 and 8 digits •7 digit with max value 9 999 999 recommended

• Decimal digits are converted to binary SSI• Incorrect numbers are rejected.

Enhanced TETRA Numbering

• Communication beyond home TETRA Network e.g.

another TETRA, PABX, PSTN, ISDN• Need for algorithm selection• Selection of Dialling Plan

•Direct number entry via keypad, Mode selection buttons, Soft key menu

selection, Leading Digit Dialling

• DTMF can be used to access services outside TETRA

networks.

Leading Digit Dialling

• Leading Digit Dialling is the only dialling algorithm

selection defined in ETR 300-5• Recommended way to achieve commonality

between manufacturers’ implementations•Predefined value for E.164 gateway access

is 16,777,184•Predefined value for ISDN gateway access

is 16,777,185•14 more values reserved for future use.

Call Scenarios

• Call originating and terminating on same Network,

• Call originating and terminating on different

Networks

• Calls between TETRA and PABX

• Calls between TETRA and E.164

(PSTN, GSM, TETRA!)

Scenario 1 - Home Network

TETRATETRA

9 2

MNCMNCMCCMCC SSISSI

1

MNCMNCMCCMCC SSISSI

Scenario 2 - Foreign TETRA Net

TETRA (UK)TETRA (UK)

TETRA (UK)TETRA (UK)

TETRA (France)TETRA (France)MCCMCC MNCMNC SSISSI

MCCMCC MNCMNC SSISSI

ISIISI

ISI

PABX GWMNI

PABX GWSSI

PABX Subscriber Number (24 digits)

Scenario 3 - PABX

TETRA (A)TETRA (A) TETRA (B )TETRA (B )ISIPABXGW

PABX (A)

PABXGW

PABX (B)

Scenario 4 - E.164 (PSTN, GSM)

E.164 GWMNI

E.164 GWSSI

External Subscriber Number (24 digits)

E.164 GWMNI

E.164 GWSSI

E.164 Subscriber Number (24 digits)

TETRA (UK)TETRA (UK) TETRA (Germany)TETRA (Germany)

E.164 (PSTN, GSM)E.164 (PSTN, GSM)

ISI

E.164GW

E.164GW

UK Phone German Phone

TETRA IP

• TETRA uses IP numbers in the same way as any other IP network

• Individual TETRA user can have a fixed IP number or the number can be allocated dynamically

• In order to do the air interface signalling, TETRA IP numbers need to be mapped to TETRA ITSIs

Conclusions

• TETRA dialling plans TETRA dialling plans provide the benefits of

flexibility and interoperability to meet the

huge variety of needs of professional users

• TETRA numbering plans TETRA numbering plans have flexibility to

efficiently deal both with simple fleet numbers

& full E.164 international numbers

• TETRA addressingTETRA addressing alignment allows for future

interoperability/ roaming with GSM