Upload
douglas-jennings
View
228
Download
3
Tags:
Embed Size (px)
Citation preview
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
Man-Machine Interface MMI - ETR 294
Full dialling
Mode keys
Soft keys
Display scrolling
Number presentation (CLI & TPI)
Special numbers e.g. 999/ 112
ETSI doc. TR 102 300-5: Leading Digit dialling Relative and Shortened dialling
ID exchange between user and terminal
TETRA Identity
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
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
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
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
• Shortened dialling
The last digits of the own SSI are replaced with the dialled digits to form the identity of the subscriber to be called
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
TETRATETRA
9 2
MNCMNCMCCMCC SSISSI
1
MNCMNCMCCMCC SSISSI
1 2 3 4 5 6 7
1 2 3 4 5 6
Calling Subscriber
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