Mobile Basics Flashcards
Cells with particular shape
1)Pico cells
2) umbrella cells
pico cells
_____ cell covers several micro cells
1)Pico cells
2) umbrella cells
umbrella cell
When the speed of the mobile is too high, the mobile is handed over to the ______ cell
1) neighbour cells
2) umbrella cells
umbrella cell
Sectorisation
1) 120 deg
2) 60 deg
3) both
both 60 deg and 120 deg
The three sector case is generally used with a _____ cell pattern
1) three
2) seven
3) twelve
seven
The three sector case results in _____ channel sets
1) 12
2) 21
3) 24
The three sector case is generally used with a seven cell pattern, giving an overall requirement for 21 channel sets.
________ allows a much higher subscriber density per MHz of spectrum
than other systems
1) frequency reuse
2) frequency hoping
3) higher bandwidth
frequency reuse
____________ requires the mobile to change frequencies under control of the cellular network
1) frequency reuse
2) handover
handover
HSDPA stands for ____
1) High Speed Downlink Packet Access
2) High Speed Data Packet Access
High Speed Downlink Packet Access
No duplexer is required for
1) FDD
2) TDD
TDD
uses different time slots for transmission and reception paths. . Only a fast switching synthesizer, RF filter path and fast antenna switch are
needed
It increases the battery life of mobile phones
1) FDD
2) TDD
TDD
GSM-900 (P-GSM) uplink
1) 895 - 920 Mhz
2) 890 - 915 Mhz
3) 880 - 915 Mhz
4) 880 - 905 Mhz
890 - 915 Mhz
25MHz width
GSM-900 (P-GSM) downlink
1) 920 - 945 Mhz
2) 925 - 950 Mhz
3) 930 - 955 Mhz
4) 935 - 960 Mhz
935 - 960 Mhz
25MHz width
GSM-900 (P-GSM) Duplex Distance
1) 25 MHz
2) 45 MHz
3) 75 MHz
4) 95 MHz
45 MHz
935-890=45
960-915=45
GSM-900 (P-GSM) Frequency Channels
1) 128
2) 124
3) 200
4) 374
124
DSC-1800 uplink
1) 1790 - 1865 MHz
1) 1720 - 1795 MHz
1) 1710 - 1785 MHz
1) 1705 - 1780 MHz
1710 - 1785 MHz
75MHz width
DSC-1800 downlink
1) 1805 - 1880 MHz
2) 1815 - 1890 MHz
3) 1795 - 1870 MHz
4) 1805 - 1880 MHz
1805 - 1880 MHz
75MHz width
DSC-1800 Duplex Distance
1) 25 MHz
2) 45 MHz
3) 75 MHz
4) 95 MHz
95 MHz
1805-1710=95
1880-1785=95
DSC-1800 Frequency Channels
1) 128
2) 124
3) 200
4) 374
374
GSM-900 and 1800 Carrier separation
1) 25MHz
2) 200MHz
3) 100KHz
4) 200KHz
200 KHz
GSM-900 and 1800 Voice coder bit rate
1) 4 kbps
2) 9 kbps
3) 13 kbps
4) 16 kbps
13 Kbps
GSM-900 and 1800 Modulation
1) QPSK
2) GMSK
3) QAM
GMSK
GSM-900 and 1800 Air transmission Rate
1) 120 kbps
2) 270 kbps
3) 320 kbps
270.8333 Kbps
GSM-900 and 1800 Access Method
1) FDMA
2) TDMA
3) CDMA
1 and 2
FDMA/TDMA
??? GSM-900 and 1800 Speech Coder
1) RPE-LTP
2) REP-LTP
3) REP-LPT
4) RPE-LPT
RPE-LTP
GSM-900 and 1800 Duplexing
1) TDD
2) FDD
FDD
GSM subsystems
1) BSS
2) NSS
3) OSS
4) All
All
Base Station Subsystem (BSS)
Network Switching Subsystem (NSS)
Operation Support Subsystem (OSS)
Four databases associated with MSC
1) HLR
2) ___
3) ___
4) ___
HLR, VLR, EIR and AUC
MS-BTS interface
1) Un
2) Abis
3) A
2) B
Un
BTS-BSC interface
1) Un
2) Abis
3) A
2) B
Abis
BSC-MSC interface
1) Un
2) Abis
3) A
2) B
A
MSC-VLR interface
1) Un
2) Abis
3) A
2) B
B
MSC-HLR interface
1) A
2) B
3) C
2) D
C
MSC-EIR interface
1) E
2) F
3) G
2) H
F
MSC-other MSC interface
1) E
2) F
3) G
2) H
E
VLR-HLR interface
1) A
2) B
3) C
2) D
D
VLR-other MSC’s VLR interface
1) E
2) F
3) G
2) H
G
Upon request, the MS sends
IMEI number over the signalling channel to the MSC (T/F)
T
MSISDN stands for___
Mobile Subscriber ISDN Number
Mobile Station ISDN Number
_______ is used by the land network to route calls toward an appropriate MSC
1) IMEI
2) MSISDN
3) IMSI
4) TMSI
MSISDN
IMSI stands for___
international mobile subscriber identity
______ 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
IMSI
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
TMSI
Five different categories of mobile telephone units
20W, ______
20W, 8W, 5W, 2W, and 0.8W
SIM card PIN is stored ____
1) within the SIM
2) in the network
within the SIM
______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
BTS
A single transceiver within BTS supports
______ basic radio channels of the same TDM frame.
1) four
2) eight
3) two
eight
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
BSC
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
three to five
TRAU in BSS stands for
Transcoder/Rate Adapter Unit
TRAU (sub part of BTS) is situated at
a) BTS
b) BSC
c) between the BSC and the MSC
d) All of the above
All of the above
TRAU is a subpart of
1) BTS
2) BSC
3) MSC
BTS
TRAU: Transcoder/Rate Adapter Unit
MSC and the BSS is a
1) V2
2) SS7
standardized SS7 interface
A interface is
1) V2
2) SS7
standardized SS7 interface
The _____ performs the Radio Resource (RR) management for the cells under its
control.
1) BTS
2) BSC
3) MSC
BSC
It assigns and release frequencies and timeslots for all MSs in its own area
1) BTS
2) BSC
3) MSC
BSC
It performs the inter-cell handover for MSs moving between BTS in its control
1) BTS
2) BSC
3) MSC
BSC
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
BSC
controls the power transmission of both BSSs and MSs in its area
1) BTS
2) BSC
3) MSC
BSC
The minimum power level for a mobile unit is broadcast over the ___channel
1) SCCH
2) BCCH
BCCH
It measures the time delay of received MS signals relative to the BTS clock
1) BTS
2) BSC
BSC
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
both
the time and frequency synchronization reference signals broadcast by BTS is provided by
1) BTS
2) BSC
3) MSC
BSC
MSC performs functions
1) paging
2) resource allocation
3) location registration and encryption
4) all the above
all the above
The dynamics allocation of access resources is done by ____ in coordination with the ____.
1) BTS, BSC
2) MSC, BSS
3) BSS, MSC
MSC in coordination with the BSS
____ decides when and which types of channels should be assigned to which MS.
1) BTS
2) BSC
3) MSC
MSC
The channel identity and related radio parameters are the responsibility of the _____
1) BTS
2) BSS
3) MSC
BSS
The MSC performs billing on calls
for _______ based in its areas.
1) home subscribers
2) all subscribers
all subscribers
When the subscriber is roaming elsewhere, the MSC obtains data for the call billing from the _____
1) home MSC
2) visited MSC
visited MSC
Encryption parameters transfers
from VLR to BSS to facilitate ciphering on the radio interface are done by ___
1) BTS
2) BSS
3) MSC
MSC
It acts as a message mailbox and delivery system
1) BTS
2) BSS
3) MSC
MSC
When a MS appears in a _____, it starts a registration procedure
1) BTS Area
2) LA
3) MSC area
LA
____ is the reference database for subscriber parameters.
1) HLR
2) VLR
HLR
______ is the reference database for various identification numbers and addresses as well as authentication parameters
1) HLR
2) VLR
HLR
______ is the reference database for various services subscribed, and special routing information
1) HLR
2) VLR
HLR
______ is the reference database for subscriber’s temporary roaming number and associated VLR if the mobile is roaming
1) HLR
2) VLR
HLR
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
HLR
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
HLR
The VLR is collocated with an MSC
T/F
True
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
HLR
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
both
Authentication information and ciphering keys are stored in a database within the ________
1) HLR
2) VLR
3) AUC
AUC
the mobile must provide the correct ________ in answer to a random number (RAND) generated by AUC
1) SSRE
2) SRES
3) RESS
Signed Response (SRES)
Ki and the cipher key Kc are _____ across the air interface between the BTS and the MS
1) never transmitted
2) sometimes transmitted
never transmitted
The cipher key is transmitted on the ____ between the home HLR/AUC and the visited MSC
1) DLS
2) HLS
3) SS7
SS7 link
The cipher key is transmitted on the SS7 link between the home HLR/AUC and the ________
1) home MSC
2) visited MSC
visited MSC
cipher key is supposed to change with each phone call (T/F)
T
AUC will often be physically included with the ___
1) HLR
2) VLR
HLR
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
both
_____ is a database that stores the IMEI numbers for all registered ME units
1) HLR
2) VLR
3) EIR
EIR
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
both
EIR class contains all MEs with faults not important enough for barring
1) White
2) Grey
3) Black
Grey List
a part of MSC, which provides the subscriber with access to data rate and protocol conversion facilities
1) EC
2) IWF
Interworking Function (IWF)
data can be transmitted between GSM Data Terminal Equipment (DTE) and a land-line DTE with the help of ____
1) EC
2) IWF
Interworking Function (IWF)
EC is used on the ___ side of the MSC
1) PLMN
2) PSTN
PSTN
_______ 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
EC
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
180 ms
The standard EC cancels about ___ ms
of delay.
1) 70 ms
2) 180 ms
3) 10 ms
70 ms
The _____ also keeps track of the different software versions running on different subsystems of the
GSM.
1) OMC
2) MSC
3) HLR
OMC
IMSI consists of
1) MCC a mobile country code
2) MNC mobile network code
3) MSIN mobile subscriber identification number
4) All
All
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
TMSI
MSISDN consists of
1) CC country code
2) NSN National Significant Number
4) both
both
NSN shall not exceed _____ digits
1) 10
2) 15
3) 7
15
________ is assigned upon demand by the HLR on a per-call basis.
1) TMSI
2) MSRN
is used to determine authorized (white), unauthorized (black), and malfunctioning (gray) GSM hardware
1) TMSI
2) MSRN
3) IMEI
IMEI
___ is never sent in cipher mode by MS
1) TMSI
2) MSRN
3) IMEI
IMEI
