Transcript TWC05_5_DNA_Pieter

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
Display scrolling
Soft keys
ETSI doc. TR 102 300-5:
Leading Digit dialling
Relative and Shortened dialling
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
COUNTRY
CODE
(MCC)
10 BITS
3/4 DIGITS
MOBILE
NETWORK
CODE
(MNC)
14 BITS
4/5 DIGITS
SHORT SUBSCRIBER
IDENTITY
(SSI)
24 BINARY BITS
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
MOBILE
COUNTRY
CODE
(MCC)
4/5 DIGITS
MOBILE
NETWORK
CODE
(MNC)
7 / 8 DECIMAL DIGITS
SHORT SUBSCRIBER
IDENTITY
(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
ISI
ISI
MCC
MNC
SSI
MNC
SSI
TETRA (UK)
TETRA (France)
Scenario 3 - PABX
PABX GW
MNI
TETRA (A)
PABX GW
SSI
PABX Subscriber
Number (24 digits)
ISI
TETRA (B )
PABX
GW
PABX
GW
PABX (A)
PABX (B)
Scenario 4 - E.164 (PSTN,
GSM)
TETRA (UK)
E.164
GW
E.164 GW
MNI
ISI
E.164 GW
SSI
TETRA (Germany)
External Subscriber
Number (24 digits)
E.164
GW
E.164 (PSTN, GSM)
UK Phone
E.164 GW
MNI
E.164 GW
SSI
E.164 Subscriber
Number (24 digits)
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