6.0 ids in gsm

GSM ELEMENTS COMMUNICATION

MSISDN

MSISDN-to-IMSI-to-MSC address

MSISDN

MSRN

GMSC

PSTN

MSC/VLR

HLR

IMSI

MSRN

IMSI-to-MSRN

MSRN

MSISDN

• Mobile Station ISDN Number

• uniquely identifies a mobile telephone subscription (at most 15 digits)

• Number dialed when calling a mobile subscriber; actual telephone number

CC

COUNTRY

CODE

NDC

NATIONAL

DESTINATION

CODE

SN

SUBSCRIBER

NUMBER

NATIONAL NUMBER

INTERNATIONAL MS ISDN NUMBER

+ 63 917 000-0000

IMSI• International Mobile Subscriber Identity

• unique identity allocated to each subscriber (at most 15 digits) which facilitates correct subscriber information/identification

MCC

3 digits

MOBILE

COUNTRY

CODE

MNC

2-3 digits

MOBILE

NETWORK

CODE

MSIN

MS

IDENTIFICATION

NUMBER

NATIONAL MSI

IMSI

UNIQUE PER SIM

TMSI

• TEMPORARY MOBILE SUBSCRIBER IDENTITY

• half the size of IMSI

• used to protect the subscriber’s identity in the air interface

• it has a local significance, only within the MSC/VLR area

IMEI

• International Mobile Equipment Identity

• used to uniquely identify the mobile equipment

TAC

6 digits

TYPE

APPROVAL

CODE

FAC

2 digits

FINAL

ASSEMBLY

CODE

SNR

6 digits

SERIAL

NUMBER

INTERNATIONAL MS ISDN NUMBER

Spare

1 digit

SPARE

always = 0

MSRN

• Mobile Station Roaming Number

• used by the HLR to identify in what MSC/VLR service area the subscriber is currently located

CC

SPARE

Always = 0

NDC

NATIONAL

DESTINATION

CODE

SN

SUBSCRIBER

NUMBER

MSRN

0 917 000-0000

LAI

• Location Area Identity

• two purpose:– paging - informs the MSC w/c LA the MS is currently in

– used also for location updating

MCC

3 digits

MOBILE

COUNTRY

CODE

MNC

2-3 digits

MOBILE

NETWORK

CODE

LAC

16 bits

LOCATION

AREA

CODE

LAI

CGI• Cell Global Identity

• used for cell identification in the location area

MCC

3 digits

MOBILE

COUNTRY

CODE

MNC

2-3 digits

MOBILE

NETWORK

CODE

LAC

16 bits

LOCATION

AREA

CODE

LAI

CI

16 bits

CELL

IDENTITY

CGI

BSIC

• Base Station Identity Code

• makes it possible for the MS to distinguish different neighboring base stations

NCC

3 bits

NETWORK

COLOR

CODE

BSIC

BCC

3 bits

BASE STATION

COLOR

CODE

TRAFFIC CASE

HLR

BSCMSC/

VLRGMSC

PSTN

1

2

3

4

5 5

6 7

8

8

9

MSISDN

MSISDN

IMSI

MSC/VLR AREA

IMSI

MSRN

VLR:

IMSI - MSRN

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