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					Dialling, Numbering &
      Addressing

      Pieter de Kruyff
 R&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

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

                ADDRESSING - Identity exchange
                mechanism over air- interface,
                provides the routing information
                for the network
   TETRA Dialling & MMI
     ID exchange between user and terminal
                         TR 102 300-5:
                          Leading Digit dialling
                          Relative and Shortened dialling
Display scrolling

     Soft keys           Number presentation (CLI & TPI)
                          Special numbers e.g. 999/ 112
                          Mode keys
                          Full dialling

        Man-Machine Interface MMI - ETR 294
TETRA Identity

MOBILE NETWORK ID           SHORT SUBSCRIBER ID

     24 BINARY BITS              24 BINARY BITS


  MOBILE       MOBILE       SHORT SUBSCRIBER
 COUNTRY      NETWORK
   CODE
                                IDENTITY
                CODE
  (MCC)         (MNC)              (SSI)

10 BITS        14 BITS      24 BINARY BITS
3/4 DIGITS     4/5 DIGITS   7/8 DECIMAL DIGITS
Family of TETRA Addresses
HOME NETWORK

  (ITSI) INDIVIDUAL TETRA SUBSCRIBER IDENTITY


   (GTSIs) GROUP TETRA SUBSCRIBER IDENTITIES


    (ATSI) ALIAS TETRA SUBSCRIBER IDENTITY

VISITING NETWORK
   (V)ATSI VISITING ALIAS TETRA SUBSCRIBER IDENTITY
 (V)GTSIs VISITING GROUP TETRA SUBSCRIBER IDENTITIES
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)
Numbering & Addressing
•   Numbering and Addressing Plans
•   Basic Numbering
•   Enhanced Numbering
•   Leading Digit Dialling
•   Call Scenarios
    – Home & Foreign Network
    – PABX & E.164
Linking TETRA Addressing &
Numbering
           TETRA NUMBER

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


  MOBILE        MOBILE       SHORT SUBSCRIBER
 COUNTRY       NETWORK
   CODE
                                 IDENTITY
                 CODE
  (MCC)          (MNC)              (SSI)


   TETRA ADDRESS
Basic TETRA Number SSI
• 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
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 during a call.
Leading Digit Dialling
• Leading Digit Dialling is the only dialling
  algorithm selection defined in TR 102 300-5
• 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.
Dialling methods

• Relative dialling
  The last digits of the own SSI are replaced with the
  dialled digits to form the identity of the subscriber to be
  called

• Shortened dialling

  The last digits of a predefined base address (SSI) are
  replaced with the dialled digits to form the identity of the
  subscriber to be called
Private Numbering Plans
A private numbering plan uses a number space which is
independent of TETRA SSI or E.164 numbering.
The TETRA MoU has prepared two specifications for private
numbering:
•Fleet Specific Short Number (FSSN, TTR001- 7)
•Radio User Number (RUN, TTR001 - 18)
The TETRA Standard describes Short Number Addressing
(SS-SNA, ETS 300 392-10-7), which provides a private
numbering space of 256 addresses.
Fleet Specific Short Number
FSSN uses one million addresses from the SSI addressing space
with a base address of 15.000.000. The calling user may dial the
FSSN of up to 6 digits, which are added to the base address.
The Air Interface provides the transposed number (15.nnn.nnn)
to the infrastructure where the number is translated to the real
SSI of the called subscriber.
The calling subscribers identity is translated to the associated
FSSN number and presented as CLI at the called terminal.
The FSSN numbering space may be re-used by several user
organisations.
Radio User Number
The RUN identifies the user rather than the radio terminal.
When the user authenticates himself (RUA, TTR001-17), part of
the process is entering his RUN, which is mapped by the system
to the ITSI of the used radio terminal.
The infrastructure resolves the called ITSI from the called RUN
for the routing of the call as well as the calling RUN from the
calling ITSI for display as the CLI at the called terminal.
The call setup message is addressed to the SSI identifying the
RUN application. The RUN is carried in the ESN field in the
same way as an E.164 number.
     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


                         12 3456 92
         MCC      MNC           SSI
TETRA




               1 2 3 4 5 6 7 1 Calling Subscriber
  MCC   MNC        SSI
 Scenario 2 - Foreign TETRA Net

TETRA (UK)

                    ISI

                           MCC         MNC      SSI

                                ISI    TETRA (UK)
              ISI



     MCC     MNC          SSI         TETRA (France)
            Scenario 3 - PABX

            PABX GW       PABX GW         PABX Subscriber
              MNI           SSI           Number (24 digits)

TETRA (A)                                                        TETRA (B )
                                    ISI
        PABX
         GW
                                                               PABX
                                                                GW




               PABX (A)                                               PABX (B)
             Scenario 4 - E.164 (PSTN,
             GSM)
     TETRA (UK)                    ISI
                                                     TETRA (Germany)



           E.164 GW    E.164 GW          External Subscriber    E.164
E.164                                                            GW
 GW           MNI         SSI             Number (24 digits)

                             E.164 (PSTN, GSM)


            E.164 GW    E.164 GW           E.164 Subscriber
               MNI         SSI             Number (24 digits)
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 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
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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posted:11/24/2011
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