GSM prep exam questions & answers 2024/2025
Explain FDMA - ANSWERSEach user occupies a private frequency, protected from user interference through physical seperation
Explain TDMA - ANSWERSEach user occupies a specific frequency but only during an assigned time slot, the frequency is used b...
Explain FDMA - ANSWERSEach user occupies a private frequency, protected from user interference
through physical seperation
Explain TDMA - ANSWERSEach user occupies a specific frequency but only during an assigned time slot,
the frequency is used by other users during other time slots
Explain CDMA - ANSWERSEach user occupies a signal on a particular frequency simultaneously with
many other users, but it is uniquely distinguishable by correlation with a special code used only by this
user
What access schemes does GSM use - ANSWERSTDMA and FDMA
Define RSSI - ANSWERSReceived signal strength indicator - a measurement of how well your device can
hear a signal
Does the GSM network use a half duplex or full duplex system - ANSWERSHalf duplex
How many time slots does GSM use and how are they numbered - ANSWERS8, 0-7
What type of modulation does GSM use - ANSWERSGaussian minimum shift keying
What is a physical GSM channel and what does it consist of - ANSWERSIt is a pair of frequencies, up link
(reverse) and down link (forward)
What are the sub channels of FCCH - ANSWERSPCH and SDCCH
, What are the sub channels of SCH - ANSWERSRACH and FACCH
What are the sub channels of BCCH - ANSWERSAGCH and SACCH
Define IMEI and explain two ways to retrieve it from handset - ANSWERSIt is a unique number for
identifying a device on a mobile network, under battery or *#06#
How many digits is an IMEI and how is it broken down (after 2003) - ANSWERS15, TAC 8 make and
model, SN 6 serial number, CD 1 not trans verified validity
Define SIM and name 5 things stored on it - ANSWERSStore network specific information used to
authenticate and identify subscribers on the network
Define IMSI, how many digits it is, and how it is broken down - ANSWERSIs a 15 digit number that
identifies ever subscriber of a cell network, MCC 3, MNC 2-3, and MSIN 9
Define TMSI why it is used and who assigns it - ANSWERSIs a randomly allocated temporary id number
that is used instead of the IMSI to ensure privacy of the MS, VLR
What is frequency reuse and why do providers use it - ANSWERSThe reuse of frequencies by a network
provider, provides only buy portions of the freq spectrum to high cost
Define sres and what three things do you need to generate it - ANSWERSSigned response, provides
authentication from the ms to the network, results of Ki and RAND through A3 algorithm
Define Kc and what three things do you need to generate it - ANSWERSSession key, result of RAND and Ki
through A8 algorithm
What two places are the Ki stored - ANSWERSSIM and AuC
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