Dialling, Numbering

1
Dialling, Numbering Addressing

• Pieter der Kruyff
• RS BICK Mobilfunk GmbH

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Agenda

• Definition of terms
• Dialling Man Machine Interface (MMI)
• Addresses and Identities
• Numbering and Addressing
• Call Scenarios

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Definition of terms(as used in this presentation)
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TETRA Dialling MMI
ID exchange between user and terminal
Leading Digit dialling - ETR 300-5
Display scrolling
Number presentation (CLI TPI) with mnemonics
Soft keys
Special numbers e.g. 999/ 112
Mode keys
Full dialling
Man-Machine Interface MMI - ETR 294
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TETRA Addressing
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Family of TETRA Addresses
(ITSI) INDIVIDUAL TETRA SUBSCRIBER IDENTITY

(GTSIs) GROUP TETRA SUBSCRIBER IDENTITIES
(ATSI) ALIAS TETRA SUBSCRIBER IDENTITY
HOME NETWORK
(V)ATSI VISITING ALIAS TETRA SUBSCRIBER IDENTITY
(V)GTSIs VISITING GROUP TETRA SUBSCRIBER
IDENTITIES
VISITING NETWORK
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TETRA Addressing Plan
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Numbering Addressing

• Numbering and Addressing Plans
• Basic Numbering
• Enhanced Numbering
• Leading Digit Dialling
• 4 Scenarios
• Home Foreign Network
• PABX E.164

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Linking TETRA Addressing Numbering
TETRA NUMBER
TETRA ADDRESS
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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.

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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.

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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.

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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.

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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!)

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Scenario 1 - Home Network
TETRA
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Scenario 2 - Foreign TETRA Net
TETRA (UK)
TETRA (UK)
TETRA (France)
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Scenario 3 - PABX
TETRA (A)
TETRA (B )
ISI
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Scenario 4 - E.164 (PSTN, GSM)
TETRA (UK)
TETRA (Germany)
E.164 (PSTN, GSM)
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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

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Conclusions

• TETRA dialling plans provide the benefits of
  flexibility and interoperability to meet the huge
  variety of needs of professional users
• TETRA numbering plans have flexibility to
  efficiently deal both with simple fleet numbers
  full E.164 international numbers
• TETRA addressing alignment allows for future
  interoperability/ roaming with GSM