GSM Theory Exam Questions & Answers 2024/2025
Intra-BTS handover - ANSWERSHandover between sectors on a single tower
Inter-BTS handover - ANSWERSHandover between towers within the same BSC
MSC Internal handover - ANSWERSHandover between towers within the same LAC
MSC External handover...
Intra-BTS handover - ANSWERSHandover between sectors on a single tower
Inter-BTS handover - ANSWERSHandover between towers within the same BSC
MSC Internal handover - ANSWERSHandover between towers within the same LAC
MSC External handover - ANSWERSHandover between different LACs
What's RXQUAL? - ANSWERSA 0-7 value that corresponds to a bit error rate, represents quality of the
signal during a TCH
What assigns the TCH? - ANSWERSThe SDCCH
What is the IMEI? - ANSWERS15 digit number assigned to an ME.
-Made up of the Type Allocation Code (TAC) which gives the make & model of a phone, is also 8 digits
long.
-Serial Number (SN): 6 digits denoting a unique number for each phone
-Check Digit (CD): Last digit of the IMEI, it's never transmitted, it's used to verify the validity of an IMEI
What is the ME? - ANSWERSA radio that communicates with the cellular network
-May have added functionality, from the basic phone book options, to a Personal Digital Assistant (PDA)
-Each ME is assigned a 15 digit IMEI, which can be located on the handset itself, usually under the
battery. It can also be retrieved by typing *#06#
What is the SIM? - ANSWERSSIM card is a "Smart Card" microprocessor used for various applications
, -It stores network specific information used to authenticate & identify subscribers on the network. It
includes:
-IMSI
-MSISDN
-TMSI
-Ki & Security Algorithms
-Last location information
-Phonebook, last ten sent, received & missed calls & SMSs
-PRL/BRL
What's the IMSI - ANSWERS15 digit number that's assigned to each SIM
-The IMSI is made up of the MCC, the MNC & the MSIN
-The MCC & MNC combine to make the PLMN
-The MSIN is a unique number assigned by the service provider to that SIM card
-The MNC can be represented as a two digit number & transmits a 0, as the first digit or the last digit,
e.g. 0## or ##0
What's the TMSI? - ANSWERSThe primary use for a TMSI is for security purposes; to mask the IMSI which
minimizes the number of times it's sent over the air
-A TMSI is specific to a Location Area Identity (LAI), & it'll change when the MS moves to another
Location Area (LA), or at other network determined intervals
-32 bit hexadecimal number assigned by a VLR
-TMSIs are unique within a VLR's managed area
What's the MSISDN - ANSWERSThe Mobile Subscriber Integrated Services Digital Network Number
(MSISDN) is the subscriber's phone number
-One SIM can have up to three MSISDNs, one each for Voice, Data, & Fax
-The Country Code (CC) is unique for each country
-The National Destination Code (NDC) & Subscriber Number (SN) are administered by each country
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