WorksheetsWireless Communication
Total questions: 116
Worksheet time: 25hrs 54mins
A periodic signal is always:
A signal is periodic when:
The same signal pattern repeats every 1 second.
The same signal pattern repeats every 1 Hz.
The same signal pattern repeats over time.
The same signal pattern repeats over frequency.
Assuming two level signalling, what is the channel capacity if its frequency range is 100-400Hz according to Nyquist’s capacity measure in a noise free channel?
300bps.
600bps
500bps.
300Hz.
500Hz.
Select 3 of the below options that can describe a digital signal.
The signal may be discontinuous
The signal is discontinuous
The signal intensity maintains a constant value for some period of time.
The signal may be discrete.
The signal is discrete.
If the signal over noise ratio (S/N) is equal to 1000 what is the SNR in dB?
None of the above
20
40
30
Which one of the following cases is Digital data to digital signal?
Computer communication using telephone line
Computer communication using ISDN.
Home telephone system.
Digital mobile communication system
According to Shannon what is the formula to calculate the channel maximum capacity on a noisy channel in bps (where C the channel capacity in bps and B the channel bandwidth in Hz)?
C = SNRlog2(1+B).
C = Blog2(SNR+1).
C = SNRlog10(1+B).
C = Blog2(SNR).
Select 3 of the below signals you think are analogue.
Voice
Pressure
Video
.ASCII code
Wave length is measured in
Hz
Cycles per metre
Metres
Seconds
Which of the following are key factors that affect the transmission in any wireless communication system? (Multiple answers).
Attenuation
Delay distortion
Signal power
Interference
Quadrature amplitude modulation (QAM) is a combination of
ASK and FSK
ASK and PSK
PSK and FSK
None of the above
What is altered in "PSK" to represent 0s and 1s?
Average amplitude
Average phase
Phase
Peak amplitude
Which of the following cases is considered to be "analogue data to analogue signal"?
Digital mobile communication system
Computer communication using ISDN
Computer communication using telephone line
Home telephone system
Which of the following techniques is appropriate to transmit digital data using analogue signals (Choose 3 answers)?
ASK
FSK
PHSK
PSK
SSK
What is the name of a codec to be used when converting from analogue to digital
FDM
PSK
TDM
PCM.
In PCM how many levels does a 4-bit system produce?
64
32.
4.
16.
8.
According to Nyquist’s sampling theorem, how many samples per second are required to recreate a signal that has a frequency range 1-1000Hz?
999
1998
1001
2000
Which of the following is modulation techniques (Choose 2 answers
Alpha modulation
Packet code modulation
Delta modulation
Pulse code modulation
The function of multiplexing is
To reduce the bandwidth of the signal to be transmitted
To combine multiple data streams over a single data channel.
To allow multiple data streams over multiple channels in a prescribed format
To match the frequencies of the signal at the transmitter as well as the receiver
In QPSK what would be the carrier phase and amplitude when we try to transmit “11”?
45 & 1.0
135 & 1.0
225 & 1.0
315 & 1.0
Which of the following are not telephony services supported by GSM?
Dual-tone multifrequency
Call waiting
Voice mail
Fax mail
The authentication center (AC) provides authentication and encryption parameters that verify the user's identity and ensure the confidentiality of each call.
true
false
The location area is the area in which a subscriber can be paged
True
False
GSM utilizes the code division multiple access (CDMA) concept, rather than time division multiple access (TDMA)
True
False
What is the basic service unit of cellular telephony?
MSC/VLR service area
PLMN service area
Location area
Cell
The network subsystem in GSM is responsible for (Choose 3 answers)
Roaming between cells
Subscriber Management
QoS Management
Switching of calls
Mobility Management
The home location register (HLR) is a database used for storing and managing subscriptions.
true
false
Which area of the world first deployed cellular services for commercial use?
Western Africa
Central Asia
Eastern Europe
Scandinavia
The base station subsystem in GSM is responsible for
Providing the network with redundancy
Roaming subscriber between cells
Wirelessly connecting mobile subscribers to the network
Monitoring the condition of the network and producing alert messages
In order to have a Mobile Station we need to put together the following (Choose 2 answers)
Band processor
SIM card
BTS
Mobile device
Right now, GSM is the accepted cellular standard in
Europe
South America
North America
Southeast Asia
All of the above
Which subsystems are included in GSM network? (Multiple answers)
Network Management Subsystem (NMS)
Core Information Subsystem (CIS)
Base Station Subsystem (BSS)
Central Switching Subsystem (CSS)
Network Switching Subsystem (NSS)
Which of the following are NSS subcomponents (Choose 2 answers)?
VLR
MSC
BSC
SLR
In GSM, the NMS is responsible for (Choose 3 answers)
Performance management
Mobility management
Connection management
Configuration management
Fault management
The first cellular systems were
Digital
Analog
EDGE added further
Speed
Mobility
Latency
All of the above
GPRS enhanced the GSM standard in order to (Choose 2 answers)
Improve roaming between cells
Transport data
Enable wireless devices to access the internet
Handle more subscribers
In GPRS, multiple SGSNs may connect to a single GGSN
true
false
In GPRS network data is sent as
Frame
Circuits.
Cells.
Packets.
GPRS is typically installed as an upgrade to
AMPS network
CDMA network
GSM network
IS-95 network
It also provides support for WCDMA based networks which is called
3GPP Long Term Evolution
Universal Mobile Telecommunication System
WiMAX
3G
The Um interface in GPRS connects
The mobile device to the BG
The mobile device to the SGSN
The mobile device to the GGSN
None of the above
In GPRS, the SGSN is responsible for (Choose 2 answers)
Performance management
Connections management
User management
Signalling management
What are the three main components that were added when GPRS was introduced?
Transcoder
Serving GPRS Support Node
Base Station Controller
Packet Control Unit
Gateway GPRS Support Node
In GPRS, the PCU is responsible to
Separate the circuit switched from the packet switched traffic
Maintain and update subscribers’ information
Manage mobility of users between different BTSs
Monitor the performance of the core network
The connection speed enhancements introduced by UMTS are referred to as
High Speed Access
High Speed Connection Access
High Speed Access Packet
High Speed Packet Access
In UMTS, what the multiplexing technique is used?
CDMA
TDMA
FDMA
All of the above
In UMTS release 8, what is the successor of UTRAN?
16UTRAN
eUTRAN
iUTRAN
8UTRAN
In UMTS, what is the name of the parameter responsible for describing how good or bad the channel is?
Channel Performance Ratio
Channel Quality Index
Channel Quality Ratio
Signal over Noise Ratio
What modulation technique is used in UMTS release 8?
FSK
QPSK
QAM-64
QAM-128
In UMTS, Media Gateway is responsible for
Handling only media traffic
Handling all user traffic
Handling all user traffic except media traffic
None of the above
Which of the following statements is true in UMTS?
An RNC can control multiple Node-Bs
A Nobe-B can cover a single cell
An RNC can cover multiple cells
None of the above
What is the limitation of CDMA?
Not all users can transmit at the same time
If many users connect at the same time, speed is decreased
Users use only a small portion of the bandwidth
If SNR is not very good, communication is affected much faster
In UMTS, user data is exchanged between the RNC and Node-B using what protocol?1
FR
FP
ATM
SS7
In UMTS and from the point of view of the MSC, what the 3 possible mobility management states a mobile device can be in?
Detached
Disconnected
Idle
Connected
5G transceivers will incorporate full-duplex technology for data transmission to double the capacity of wireless networks. What does full-duplex mean?
The ability to transmit and receive data at the same time and frequency
The ability to become compatible with all types of IoT devices
The ability to utilize the full capacity of transmission at all times
The ability to incorporate twice the number of transceivers into one base station
The eNode-B is responsible for (Choose 3 answers)
User management
Routing of traffic
Interface management
Billing control
Mobility management
The limitation of TDD is that
It cannot transmit over a single frequency band
It cannot send and receive at the same time
It needs to use “guard band” for separation
None of the above
In 5G, Standalone network architecture is made of:
4G air interface and 5G core network
4G air interface and 4G core network
5G air interface and 5G core network
5G air interface and 4G core network
In LTE, the Mobility Management Entity is responsible for (Choose 3 answers)
SMS and voice support
Mobility management
Handover support
QoS
User authentication
What are the bands range used in NR of Frequency Range 2 (FR2)?
1.2-10MHz
4250-52600MHz
400-7125MHz
20MHz
Select the 3 major elements of eNode-B
Antenna
Digital modules
Access modules
Radio modules
What multiplexing technique is used in LTE?
FDM
CDMA
OFDMA
TDM
Which of the following components are introduced by LTE (Choose 3 answers)?
Home Subscriber Server
Visitor Location Register
Serving Gateway
Home Location Register
Packet Data Network Gateway
In LTE, what is the name of the interface that connects the base stations with each other?
X1
S2
X2
S1
Which of the following use cases provide faster data speed?
Massive machine to machine communication
Ultra-reliable low latency communication
Enhanced mobile broadband
All of the above
Network slicing is a network management feature that 5G will allow. What does this mean users can have?
The ability to create multiple virtual networks within a single 5G network
The ability to designate multiple passwords for one 5G network
The ability to utilize connections from other nearby networks
The ability to set up multiple connection points to one 5G network
In 5G network, new radio (NR) is called:
Core network
Real-time spectrum
Radio-frequency band
Air interface
Which of the following statements is correct?
OFDMA splits time into time slots
OFDMA uses a unique code to distinguish between different users
OFDMA splits the data stream into many slower data streams
None of the above
In LTE, what is the name of the interface that connects the base station to the core network?
X2
X1
S2
S1
RELEASE 4 UMTS OFFERS :
circuit switching
packet switching
message switching
none of the above
The enhancements in connection speed that umts brought about have been identifies as
High speed Qos
High speed packet access
high speed connection speed
none of the above
what multiplexing technique is employed in UMTS?
CDMA
FDMA
TDM
WFDMA
What is the name of the UMTS parameter that determines the quality of the channel?
Channel Quality Index
Channel data ratio
Channel performance ratio
none of the above
User mobility , distance between user and call centre and interference level are 3 factors which influences the QoS in UMTS?
TRUE
FALSE
What is the total number of implementations of UTMS ?
11
10
9
5
In the UMTS, which of the following claims is true ?
Radio network controller can control multiple Node-Bs
Radio network controller can control single Node-Bs
Multiple radio controller can control single Node-Bs
none of the above
FP protocol is used in UMTS for user data exchange between the RNC and Node-B
True
False
What is the UTRANS successor (repalcement) in UMTS release 8
iUTRAN
eUTRAN
gUTRAN
999UTRAN
Which GPRS component has been replaced by Node-B in UMTS?
BSC
BSS
BTS
RTT
Which WAN technology does UMTS employ ?
ATM
ADSL
VDSL
Frame Relay
What are the three possible mobility management states that a mobile device can be in under UMTS and from the perspective of the MSC?
Idle,connected , detached
wait , until , disconnected
running . walking , sleeping
All three states are idle 1 2 and 3
Which component was removed in UMTS release 7 to reduce the processing burden ?
HLR
SGSN
VLR
GGSN
What modulation technique is used in UMTS release 7 ?
16QAM
64QAM
QAM
PSK
Which GPRS element was replaced by RNC in UMTS?
BTC
BSC
MSC
HLR
TRUE OR FALSE
TRUE
FALSE
TRUE OR FALSE ?
TRUE
FALSE
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
TRUE
FALSE
A
B
C
D
TRUE
FALSE
A
B
C
D
A
B
C
D
TRUE
FALSE
A
B
C
D
MIMO STANDS FOR ?
(a)
true
false
OFDMA splits the data stream into many slower data streams
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
AIR INTERFACE
RADIO CONNECT
A
B
C
TRUE
FALSE
A
B
C
D
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
A
B
A
B
C
D
TRUE
FALSE
TRUE
FALSE
