dialling, numbering & addressing pieter der kruyff r&s bick mobilfunk gmbh
TRANSCRIPT
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