Mobile Basics

Question 1

Cells with particular shape
1)Pico cells
2) umbrella cells

Answer 1

pico cells

Question 2

_____ cell covers several micro cells
1)Pico cells
2) umbrella cells

Answer 2

umbrella cell

Question 3

When the speed of the mobile is too high, the mobile is handed over to the ______ cell
1) neighbour cells
2) umbrella cells

Answer 3

umbrella cell

Question 4

Sectorisation
1) 120 deg
2) 60 deg
3) both

Answer 4

both 60 deg and 120 deg

Question 5

The three sector case is generally used with a _____ cell pattern
1) three
2) seven
3) twelve

Answer 5

seven

Question 6

The three sector case results in _____ channel sets
1) 12
2) 21
3) 24

Answer 6

The three sector case is generally used with a seven cell pattern, giving an overall requirement for 21 channel sets.

Question 7

________ allows a much higher subscriber density per MHz of spectrum
than other systems
1) frequency reuse
2) frequency hoping
3) higher bandwidth

Answer 7

frequency reuse

Question 8

____________ requires the mobile to change frequencies under control of the cellular network
1) frequency reuse
2) handover

Answer 8

handover

Question 9

HSDPA stands for ____
1) High Speed Downlink Packet Access
2) High Speed Data Packet Access

Answer 9

High Speed Downlink Packet Access

Question 10

No duplexer is required for
1) FDD
2) TDD

Answer 10

TDD
uses different time slots for transmission and reception paths. . Only a fast switching synthesizer, RF filter path and fast antenna switch are
needed

Question 11

It increases the battery life of mobile phones
1) FDD
2) TDD

Answer 11

TDD

Question 12

GSM-900 (P-GSM) uplink
1) 895 - 920 Mhz
2) 890 - 915 Mhz
3) 880 - 915 Mhz
4) 880 - 905 Mhz

Answer 12

890 - 915 Mhz
25MHz width

Question 13

GSM-900 (P-GSM) downlink
1) 920 - 945 Mhz
2) 925 - 950 Mhz
3) 930 - 955 Mhz
4) 935 - 960 Mhz

Answer 13

935 - 960 Mhz
25MHz width

Question 14

GSM-900 (P-GSM) Duplex Distance
1) 25 MHz
2) 45 MHz
3) 75 MHz
4) 95 MHz

Answer 14

45 MHz
935-890=45
960-915=45

Question 15

GSM-900 (P-GSM) Frequency Channels
1) 128
2) 124
3) 200
4) 374

Answer 15

124

Question 16

DSC-1800 uplink
1) 1790 - 1865 MHz
1) 1720 - 1795 MHz
1) 1710 - 1785 MHz
1) 1705 - 1780 MHz

Answer 16

1710 - 1785 MHz
75MHz width

Question 17

DSC-1800 downlink
1) 1805 - 1880 MHz
2) 1815 - 1890 MHz
3) 1795 - 1870 MHz
4) 1805 - 1880 MHz

Answer 17

1805 - 1880 MHz
75MHz width

Question 18

DSC-1800 Duplex Distance
1) 25 MHz
2) 45 MHz
3) 75 MHz
4) 95 MHz

Answer 18

95 MHz
1805-1710=95
1880-1785=95

Question 19

DSC-1800 Frequency Channels
1) 128
2) 124
3) 200
4) 374

Answer 19

374

Question 20

GSM-900 and 1800 Carrier separation
1) 25MHz
2) 200MHz
3) 100KHz
4) 200KHz

Answer 20

200 KHz

Question 21

GSM-900 and 1800 Voice coder bit rate
1) 4 kbps
2) 9 kbps
3) 13 kbps
4) 16 kbps

Answer 21

13 Kbps

Question 22

GSM-900 and 1800 Modulation
1) QPSK
2) GMSK
3) QAM

Answer 22

GMSK

Question 23

GSM-900 and 1800 Air transmission Rate
1) 120 kbps
2) 270 kbps
3) 320 kbps

Answer 23

270.8333 Kbps

Question 24

GSM-900 and 1800 Access Method
1) FDMA
2) TDMA
3) CDMA

Answer 24

1 and 2
FDMA/TDMA

Question 25

??? GSM-900 and 1800 Speech Coder
1) RPE-LTP
2) REP-LTP
3) REP-LPT
4) RPE-LPT

Answer 25

RPE-LTP

Question 26

GSM-900 and 1800 Duplexing
1) TDD
2) FDD

Answer 26

FDD

Question 27

GSM subsystems
1) BSS
2) NSS
3) OSS
4) All

Answer 27

All
Base Station Subsystem (BSS)
Network Switching Subsystem (NSS)
Operation Support Subsystem (OSS)

Question 28

Four databases associated with MSC
1) HLR
2) ___
3) ___
4) ___

Answer 28

HLR, VLR, EIR and AUC

Question 29

MS-BTS interface
1) Un
2) Abis
3) A
2) B

Answer 29

Un

Question 30

BTS-BSC interface
1) Un
2) Abis
3) A
2) B

Answer 30

Abis

Question 31

BSC-MSC interface
1) Un
2) Abis
3) A
2) B

Answer 31

A

Question 32

MSC-VLR interface
1) Un
2) Abis
3) A
2) B

Answer 32

B

Question 33

MSC-HLR interface
1) A
2) B
3) C
2) D

Answer 33

C

Question 34

MSC-EIR interface
1) E
2) F
3) G
2) H

Answer 34

F

Question 35

MSC-other MSC interface
1) E
2) F
3) G
2) H

Answer 35

E

Question 36

VLR-HLR interface
1) A
2) B
3) C
2) D

Answer 36

D

Question 37

VLR-other MSC’s VLR interface
1) E
2) F
3) G
2) H

Answer 37

G

Question 38

Upon request, the MS sends
IMEI number over the signalling channel to the MSC (T/F)

Answer 38

T

Question 39

MSISDN stands for___

Answer 39

Mobile Subscriber ISDN Number
Mobile Station ISDN Number

Question 40

_______ is used by the land network to route calls toward an appropriate MSC
1) IMEI
2) MSISDN
3) IMSI
4) TMSI

Answer 40

MSISDN

Question 41

IMSI stands for___

Answer 41

international mobile subscriber identity

Question 42

______ is the primary identity of the subscriber within the mobile network and is permanently assigned to him
1) IMEI
2) MSISDN
3) IMSI
4) TMSI

Answer 42

IMSI

Question 43

This number can be periodically changed by the system and protect the
subscriber from being identified by those attempting to monitor the radio channel
1) IMEI
2) MSISDN
3) IMSI
4) TMSI

Answer 43

TMSI

Question 44

Five different categories of mobile telephone units
20W, ______

Answer 44

20W, 8W, 5W, 2W, and 0.8W

Question 45

SIM card PIN is stored ____
1) within the SIM
2) in the network

Answer 45

within the SIM

Question 46

______compares radio transmission and reception devices, up to and including the antennas, and also all the
signal processing specific to the radio interface
1) BTS
2) BSC

Answer 46

BTS

Question 47

A single transceiver within BTS supports
______ basic radio channels of the same TDM frame.
1) four
2) eight
3) two

Answer 47

eight

Question 48

A ______is a network component in the
PLMN that function for control of one or more BTS. It is a functional entity that handles common control functions within a BTS.
1) BTS
2) BSC
3) MSC

Answer 48

BSC

Question 49

BTS is typically able to handle _________ radio carriers, carrying between 24 and 40 simultaneous communication.
1) one to three
2) three to five
3) five to seven

Answer 49

three to five

Question 50

TRAU in BSS stands for

Answer 50

Transcoder/Rate Adapter Unit

Question 51

TRAU (sub part of BTS) is situated at
a) BTS
b) BSC
c) between the BSC and the MSC
d) All of the above

Answer 51

All of the above

Question 52

TRAU is a subpart of
1) BTS
2) BSC
3) MSC

Answer 52

BTS
TRAU: Transcoder/Rate Adapter Unit

Question 53

MSC and the BSS is a
1) V2
2) SS7

Answer 53

standardized SS7 interface

Question 54

A interface is
1) V2
2) SS7

Answer 54

standardized SS7 interface

Question 55

The _____ performs the Radio Resource (RR) management for the cells under its
control.
1) BTS
2) BSC
3) MSC

Answer 55

BSC

Question 56

It assigns and release frequencies and timeslots for all MSs in its own area
1) BTS
2) BSC
3) MSC

Answer 56

BSC

Question 57

It performs the inter-cell handover for MSs moving between BTS in its control
1) BTS
2) BSC
3) MSC

Answer 57

BSC

Question 58

It reallocates frequencies to the BTSs in its area to meet locally heavy demands during peak
hours or on special events
1) BTS
2) BSC
3) MSC

Answer 58

BSC

Question 59

controls the power transmission of both BSSs and MSs in its area
1) BTS
2) BSC
3) MSC

Answer 59

BSC

Question 60

The minimum power level for a mobile unit is broadcast over the ___channel
1) SCCH
2) BCCH

Answer 60

BCCH

Question 61

It measures the time delay of received MS signals relative to the BTS clock
1) BTS
2) BSC

Answer 61

BSC

Question 62

BSC
1) measures the time delay of received MS signals
2) performs traffic concentration to reduce the number of transmission lines from the BSC to its BTS
3) both

Answer 62

both

Question 63

the time and frequency synchronization reference signals broadcast by BTS is provided by
1) BTS
2) BSC
3) MSC

Answer 63

BSC

Question 64

MSC performs functions
1) paging
2) resource allocation
3) location registration and encryption
4) all the above

Answer 64

all the above

Question 65

The dynamics allocation of access resources is done by ____ in coordination with the ____.
1) BTS, BSC
2) MSC, BSS
3) BSS, MSC

Answer 65

MSC in coordination with the BSS

Question 66

____ decides when and which types of channels should be assigned to which MS.
1) BTS
2) BSC
3) MSC

Answer 66

MSC

Question 67

The channel identity and related radio parameters are the responsibility of the _____
1) BTS
2) BSS
3) MSC

Answer 67

BSS

Question 68

The MSC performs billing on calls
for _______ based in its areas.
1) home subscribers
2) all subscribers

Answer 68

all subscribers

Question 69

When the subscriber is roaming elsewhere, the MSC obtains data for the call billing from the _____
1) home MSC
2) visited MSC

Answer 69

visited MSC

Question 70

Encryption parameters transfers
from VLR to BSS to facilitate ciphering on the radio interface are done by ___
1) BTS
2) BSS
3) MSC

Answer 70

MSC

Question 71

It acts as a message mailbox and delivery system
1) BTS
2) BSS
3) MSC

Answer 71

MSC

Question 72

When a MS appears in a _____, it starts a registration procedure
1) BTS Area
2) LA
3) MSC area

Answer 72

LA

Question 73

____ is the reference database for subscriber parameters.
1) HLR
2) VLR

Answer 73

HLR

Question 74

______ is the reference database for various identification numbers and addresses as well as authentication parameters
1) HLR
2) VLR

Answer 74

HLR

Question 75

______ is the reference database for various services subscribed, and special routing information
1) HLR
2) VLR

Answer 75

HLR

Question 76

______ is the reference database for subscriber’s temporary roaming number and associated VLR if the mobile is roaming
1) HLR
2) VLR

Answer 76

HLR

Question 77

The ____ provides the current location data needed to support searching for and paging the MS-SIM for incoming calls, wherever the MS-SIM may be.
1) HLR
2) VLR

Answer 77

HLR

Question 78

The ____ is responsible for
storage and provision of SIM authentication and encryption parameters needed by the MSC where the MS-SIM is operating. It obtains these parameters from the AUC.
1) HLR
2) VLR

Answer 78

HLR

Question 79

The VLR is collocated with an MSC
T/F

Answer 79

True

Question 80

The ___ stores the identification of
SMS gateways that have messages for the subscriber under the SMS until they can be transmitted to the subscriber and receipt is knowledge
1) HLR
2) VLR

Answer 80

HLR

Question 81

select true
1) Both the HLR and the VLR can be implemented in the same equipment
in an MSC (collocated)
2) A PLMN may contain one or several HLRs.
3) both
4) none

Answer 81

both

Question 82

Authentication information and ciphering keys are stored in a database within the ________
1) HLR
2) VLR
3) AUC

Answer 82

AUC

Question 83

the mobile must provide the correct ________ in answer to a random number (RAND) generated by AUC
1) SSRE
2) SRES
3) RESS

Answer 83

Signed Response (SRES)

Question 84

Ki and the cipher key Kc are _____ across the air interface between the BTS and the MS
1) never transmitted
2) sometimes transmitted

Answer 84

never transmitted

Question 85

The cipher key is transmitted on the ____ between the home HLR/AUC and the visited MSC
1) DLS
2) HLS
3) SS7

Answer 85

SS7 link

Question 86

The cipher key is transmitted on the SS7 link between the home HLR/AUC and the ________
1) home MSC
2) visited MSC

Answer 86

visited MSC

Question 87

cipher key is supposed to change with each phone call (T/F)

Answer 87

T

Question 88

AUC will often be physically included with the ___
1) HLR
2) VLR

Answer 88

HLR

Question 89

Choose correct
a) AUC will use separate processing equipment for the
AUC database functions.
b) AUC will often be physically included with the HLR
1) a
2) b
3) both
4) none

Answer 89

both

Question 90

_____ is a database that stores the IMEI numbers for all registered ME units
1) HLR
2) VLR
3) EIR

Answer 90

EIR

Question 91

Choose correct
a) There is generally one EIR per PLMN
b) EIR keeps track of all ME units in the
PLMN
1) a
2) b
3) both
4) none

Answer 91

both

Question 92

EIR class contains all MEs with faults not important enough for barring
1) White
2) Grey
3) Black

Answer 92

Grey List

Question 93

a part of MSC, which provides the subscriber with access to data rate and protocol conversion facilities
1) EC
2) IWF

Answer 93

Interworking Function (IWF)

Question 94

data can be transmitted between GSM Data Terminal Equipment (DTE) and a land-line DTE with the help of ____
1) EC
2) IWF

Answer 94

Interworking Function (IWF)

Question 95

EC is used on the ___ side of the MSC
1) PLMN
2) PSTN

Answer 95

PSTN

Question 96

_______ is required at the MSC PSTN interface to reduce the effect of GSM delay when the mobile is connected to the PSTN circuit
1) EC
2) IWF

Answer 96

EC

Question 97

The total round-trip delay introduced by the GSM system, which is the result of speech encoding, decoding and signal processing, is of the order of
_____ ms
1) 1 ms
2) 18 ms
3) 180 ms

Answer 97

180 ms

Question 98

The standard EC cancels about ___ ms
of delay.
1) 70 ms
2) 180 ms
3) 10 ms

Answer 98

70 ms

Question 99

The _____ also keeps track of the different software versions running on different subsystems of the
GSM.
1) OMC
2) MSC
3) HLR

Answer 99

OMC

Question 100

IMSI consists of
1) MCC a mobile country code
2) MNC mobile network code
3) MSIN mobile subscriber identification number
4) All

Answer 100

All

Question 101

The correlation of a ____ to an IMSI only occurs during a mobile subscriber’s initial transaction with an MSC
1) TMSI
2) MSRN
3) IMEI

Answer 101

TMSI

Question 102

MSISDN consists of
1) CC country code
2) NSN National Significant Number
4) both

Answer 102

both

Question 103

NSN shall not exceed _____ digits
1) 10
2) 15
3) 7

Answer 103

15

Question 104

________ is assigned upon demand by the HLR on a per-call basis.

Answer 104

1) TMSI
2) MSRN

Question 105

is used to determine authorized (white), unauthorized (black), and malfunctioning (gray) GSM hardware
1) TMSI
2) MSRN
3) IMEI

Answer 105

IMEI

Question 106

___ is never sent in cipher mode by MS
1) TMSI
2) MSRN
3) IMEI

Answer 106

IMEI