LTE Module 2 MCQ Answers

8/16/2019 LTE Module 2 MCQ Answers

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LTE RADIO INTERFACE



LTE Introduction, Architecture Overview and Protocol Stack

© Telecoms Academy 1

SECTION 1

LTE INTRODUCTION, ARCHITECTURE

OVERVIEW AND PROTOCOL STACK





Self Assessment Multiple Choice Questions

LTE Introduction.....

Q1

which one of the following can be attributed to the increase in data trafc observed by

many mobile operators?

at rate SMSa)

smart handsetsb)

increased market sharec)

decreased xed network trafcd)

Q2

common, access independent internet applications and web 2.0 will affect…

they way people communicate in coming yearsa)

mobile market penetrationb)

xed – mobile substitution ratesc)

is not thought to affect any aspect of the mobile marketd)

Q3

higher capacity networks, service continuity, single sign-in and competitive pricing are

enabled by….

battery longevitya)

the user experienceb)

network capability evolutionc)

inter-network service agreementsd)

Q4

which of the following are LTE eUTRAN objectives?

support for market penetration greater than 100%a)

voice over IPb)

low cost roamingc)

100Mbps peak downlink data ratesd)



10 © Telecoms Academy

LTE Radio Interface

Q5

spectral efciency for LTE eUTRAN is expected to be, how many times better than the

current release 6 HSPA ?

3-4 times better in the downlinka)

3-4 times better in the uplinkb)

2-3 times better in the downlinkc)

no signicant improvementd)






Architecture Overview.....

Q1

ll in the blanks in the statement below;

One of the main objectives of the LTE architecture is an overall _____________ of the

network with a _____________ of the number of network nodes

complication, reductiona)

simplication, increaseb)

simplication, reductionc)

complication, reductiond)

Q2

how many network nodes are dened within the eUTRAN ?

1a)

2b)

3c)

4d)

Q3

the eNB connects to the SGW using which interface?

X2a)

S1_MMEb)

S1_Uc)

S2d)

Q4

the S1_MME interface carries which type of information?

user data onlya)

user data and signallingb)

voip signalling and datac)

signalling onlyd)




LTE Radio Interface

Q5

which EPC node acts as an anchoring point for inter eNB handovers between UMTS and

LTE?

eNBa)

SGWb)

MMEc)

PGWd)

Q6

which EPC node acts as a router, provides transport level packet marking and some accounting

functions ?

eNBa)

SGWb)

MMEc)

PGWd)

Q7

which EPC node is the primary signalling node, terminating NAS signalling related to mobility

management and bearer management?

eNBa)

SGWb)

MMEc)

PGWd)

Q8

which EPC node is the entry and exit point for UE connectivity and provides deep packet

inspection, DL packet marking and service level charging ?

eNBa)

SGWb)

MMEc)

PGWd)






LTE Radio Interface

Q13

interfaces between the 2G/3G core and the EPC uses which protocol?

GTPa)

RLCb)

SS7c)

MTPd)

Q14

the S8 and S6 interfaces are used to support which service?

VoIPa)

WAP gateway accessb)

roamingc)securityd)

Q15

roaming connections will most likely be…

passed through the local PDNa)

routed back to the H-PLMNb)

handled by a 3c) rd party

roaming for LTE is not yet speciedd)






Spectrum Requirements for LTE.....

Q1

which of the following spectrum bands was identied as part of the IMT 2000 family?

1520 – 1590MHza)

2410 – 2490MHzb)

82 – 105MHzc)

450 – 470MHzd)

Q2

what future event will make more radio spectrum available particularly in the 470 –

862MHz band?

analogue TV switch off a)

2G networks being switched off b)

spectrum refarmingc)

use of LTE technologyd)

Q3

in band 13 (XIII) of the proposed LTE spectrum bands how much radio spectrum is

available?

60MHza)

2 x 45MHzb)

2 x 12 MHzc)

24MHzd)

Q4

what LTE radio spectrum does band II refer to?

2.1GHza)

800MHzb)

lower 700MHzc)

1900MHzd)




LTE Radio Interface

Q5

the 1700MHz LTE radio band available in Japan is also referred to as…

band Ia)

band IXb)

band XIVc)

band VId)






An Introduction to the LTE Protocol Stack.....

Q1

in the OSI 7 layer reference model the abbreviation OSI stands for…

Open Standards Interfacea)

Object Systems Integrationb)

Open Systems Integrationc)

Open Systems Interfacingd)

Q2

which layers of the OSI reference model may be considered as end to end protocols?

physical and datalink layersa)

datalink and network layersb)

transport and network layersc)

session and presentation layersd)

Q3

which of the OSI reference model layers is responsible for communicating with the

application and providing communication services for it?

application layer a)

presentation layer b)

session layer c)

transport layer d)

Q4

frame relay, ATM, and Ethernet are generally consider to be example of which OSI model

layer?



session layer c)

data link layer d)




LTE Radio Interface

Q5

in LTE architecture which service connects the UE to the peer entity ?

radio bearer a)

EPS bearerb)

external bearer c)

end to end serviced)

Q6 In LTE architecture the EPS bearer connects which network nodes?

UE and eNBa)

UE and SGWb)

UE and PGWc)

UE and peer entityd)

Q6 in LTE architecture which bearer service connects the SGW and PGW

EPS bearer a)

external bearerb)

S5/S6 bearer c)

radio bearer d)

Q7 in LTE protocol architecture which component carrier user data and signalling transparently

from the UE to the EPC?

ASa)

NASb)

DTAPc)

S1-MMEd)

Q8 the LTE protocol architecture is split into the Radio Network Layer and Transport Network

Layer, what is the general function of the Radio Network Layer?

basic functions of data transport including RLC and MACa)

E-UTRAN functions including RRC and NASb)

network access and mobility managementc)

bearer control and session managementd)

S5/S8 Bearer





Q9 in the LTE radio interface protocol stack which of the layers is responsible for header

compression, encryption and packet sequencing?

RLCa)

PDCPb)

MACc)

PHYd)

Q10 in the LTE radio interface protocol stack which of the layers is responsible for datalink layer

functions including segmentation and reassembly, sequenced delivery and duplicate detection?

RLCa)

PDCPb)

MACc)PHYd)





End-Of-Section 1 Multiple Choice Questions

Q1

higher capacity networks, service continuity, single sign-in and competitive pricing are

enabled by….

battery longevitya)

the user experienceb)

network capability evolutionc)

inter-network service agreementsd)

Q2

which of the following are LTE eUTRAN objectives?

support for market penetration greater than 100%a)

voice over IPb)

low cost roamingc)

100Mbps peak downlink data ratesd)

Q3

which SAE reference point provides a connection between the SAE anchor and an

external system?

S1a)

S7b)

S5c)

SGid)

Q4

in the LTE radio interface protocol stack which of the layers is responsible for header

compression, encryption and packet sequencing?

RLCa)

PDCPb)

MACc)

PHYd)




LTE Radio Interface

Q5

ll in the blanks in the statement below;

One of the main objectives of the LTE architecture is an overall _____________ of the

network with a _____________ of the number of network nodes

complication, reductiona)

simplication, increaseb)

simplication, reductionc)

complication, reductiond)

Q6

how many network nodes are dened within the eUTRAN ?

1a)

2b)

3c)

4d)

Q7

common, access independent internet applications and web 2.0 will affect…

they way people communicate in coming yearsa)

mobile market penetrationb)

xed – mobile substitution ratesc)

is not thought to affect any aspect of the mobile marketd)

Q8

which of the following spectrum bands was identied as part of the IMT 2000 family?

1520 – 1590MHza)

2410 – 2490MHzb)

82 – 105MHzc)

450 – 470MHzd)





Q9

which EPC node acts as an anchoring point for inter eNB handovers between UMTS and

LTE?

eNBa)

SGWb)

MMEc)

PGWd)

Q10

which EPC node is the primary signalling node, terminating NAS signalling related to

mobility management and bearer management?

eNBa)

SGWb)

MMEc)

PGWd)

Q11

the LTE protocol architecture is split into the Radio Network Layer and Transport Network

Layer, what is the general function of the Radio Network Layer?

basic functions of data transport including RLC and MACa)

E-UTRAN functions including RRC and NASb)

network access and mobility managementc)

bearer control and session managementd)

Q12

which of the following SAE reference points provides the user plane with control and

mobility support between trusted and non-trusted IP access networks and the SAE

anchor?

S1a)

S2a/bb)

S4c)

S5ad)




LTE Radio Interface

Q13

which SAE reference point the transfer of QoS policy and charging rules from the PCRF to

the PCEP?

S5aa)

S5bb)

S6c)

S7d)

Q14

which layers of the OSI reference model may be considered as end to end protocols?

physical and datalink layersa)

datalink and network layersb)

transport and network layersc)

session and presentation layersd)

Q15

what LTE radio spectrum does band II refer to?

2.1GHza)

800MHzb)

lower 700MHzc)

1900MHzd)

Q16

roaming connections will most likely be…

passed through the local PDNa)

routed back to the H-PLMNb)

handled by a 3c) rd party

roaming for LTE is not yet speciedd)





Q17

in band 13 (XIII) of the proposed LTE spectrum bands how much radio spectrum is

available?

60MHza)

2 x 45MHzb)

2 x 12 MHzc)

24MHzd)

Q18

the S1_MME interface carries which type of information?

user data onlya)

user data and signallingb)

voip signalling and datac)

signalling onlyd)

Q19

in the OSI 7 layer reference model the abbreviation OSI stands for…

Open Standards Interfacea)

Object Systems Integrationb)

Open Systems Integrationc)

Open Systems Interfacingd)

Q20

interfaces between the 2G/3G core and the EPC uses which protocol?

GTPa)

RLCb)

SS7c)

MTPd)




LTE Radio Interface

Q21

which of the OSI reference model layers is responsible for communicating with the

application and providing communication services for it?



session layer c)

transport layer d)

Q22

in LTE architecture which service connects the UE to the peer entity ?

radio bearer a)

EPS bearerb)

external bearer c)

end to end serviced)

Q23

In LTE architecture the EPS bearer connects which network nodes?

UE and eNBa)

UE and SGWb)

UE and PGWc)

UE and peer entityd)

Q24

in LTE architecture which bearer service connects the SGW and PGW

EPS bearer a)

external bearerb)

S5/S6 bearer c)

radio bearer d)





Q25

which EPC node is the entry and exit point for UE connectivity and provides deep packet

inspection, DL packet marking and service level charging ?

eNBa)

SGWb)

MMEc)

PGWd)

Q26

in the LTE radio interface protocol stack which of the layers is responsible for datalink

layer functions including segmentation and reassembly, sequenced delivery and duplicate

detection?

RLCa)

PDCPb)

MACc)

PHYd)



The LTE Physical Layer


SECTION 2

THE LTE PHYSICAL LAYER






OFDM Principles.....

Q1

what is one of the main features of the LTE physical layer that can be attributed to LTE

performance gains over release 6 HSPA?

higher power outputa)

advanced antenna systemsb)

lower power consumptionc)

faster CPUsd)

Q2

OFDM or multi-carrier technology provides resilience against what radio interface effect?

tropospheric scatteringa)

fresnel clearanceb)

multi path fadingc)

pathlossd)

Q3

ISI occurs when..

time shifted version of the same symbol arrive at the antennaa)

pathloss exceeds 120dBb)

when frequency distortion due to Doppler effects are presentc)

when the BER exceed 10-6d)

Q4

the RMS delay spread is dened as..

the maximum time taken for signals to arrive at the antennaa)

the minimum time taken for signals to arrive at the antennab)

the difference between the maximum and minimum timesc)

the amount by which the received frequency is shiftedd)




LTE Radio Interface

Q5

if the delay spread is 10nS and the symbol time is 1µS the radio channel is consider to

be..

narrowbanda)

widebandb)

Rayleigh fadedc)

Doppler shiftedd)

Q6

a radio channel that is considered to be wideband..

is more likely to suffer from Doppler shifta)

is more likely to experience at fadingb)

is more likely to experience frequency selective fadingc)

is less likely to experience frequency selective fadingd)

Q7

OFDM radio systems exhibit high performance in multipath fading environments due to ..

a higher FEC code ratea)

relatively high power transmissionb)

low complexity modulation schemesc)

use of multiple sub-carriers across the channel bandwidthd)

Q8

the insertion of the cyclic prex in the LTE symbol prevents loss of orthogonality due to..

Doppler shifta)

inter sub-carrier interferenceb)

inter symbol interferencec)

frequency selective fadingd)

Q9

what spacing is the sub-carrier spacing in LTE?

15KHza)

200KHzb)

1.25MHzc)

5MHzd)





Q10

one of the major issues with OFDM radio systems is..

coder complexitya)

physical size of the UEb)

high peak to average power c)

poor spectral efciencyd)

Q11

the high PAPR results in..

complex receiver designa)

poor multipath performanceb)

high power consumptionc)

potentially poor spectral efciencyd)






OFDMA Structure and Modulation.....

Q1

radio systems that make use of the OFDMA mechanism provide multiple access based

on..

time domain multiple access onlya)

frequency domain multiple access onlyb)

multiple access based on code divisionc)

both time and frequency domain multiple accessd)

Q2

in the LTE physical layer the resource block is made up of..

12 sub carriers and 6 or 7 symbolsa)

12 sub carriers and 12 or 14 symbolsb)

180 sub carriers and 0.5 symbolsc)

1 x 5MHz channels and 1mS symbolsd)

Q3

one sub carrier and one symbol create a..

resource blocka)

resource elementb)

tilec)

burstd)

Q4

which one of the following modulation schemes are supported by the LTE physical layer?

OQPSKa)

8PSKb)

32QAMc)

64QAMd)




LTE Radio Interface

Q5

in 16QAM modulation, how many bits per baud are there?

1a)

2b)

4c)

16d)

Q6

in order to counter the high power requirement of OFDM, LTE uses which scheme for the

uplink?

64QAMa)

OFDMAb)

SC-FDMAc)

SOFDMAd)

Q7

in the LTE physical layer, it is generally true that higher order modulation schemes such as

64QAM require…

higher transmitted power a)

greater FEC complexityb)

higher signal to noise ratioc)

multiple antennasd)






LTE Timing and Frame Structures.....

Q1

the LTE frame type 1 has a duration of..

1mSa)

10mSb)

66.67µSc)

0.5mSd)

Q2

an LTE symbol has a duration of..

1mSa)

10mSb)

66.67µSc)

0.5mSd)

Q3

an LTE TTI consists of how many resource blocks

1a)

2b)

10c)

100d)

Q4

how many slots are there in an LTE sub-frame?

1a)

2b)

10c)

100d)




LTE Radio Interface

Q5

what is the maximum number of FFT supported by the LTE physical layer?

512a)

1024b)

2048c)

4096d)

Q6

in an LTE radio channel of 5MHz bandwidth, how many occupied sub carriers are there?

72a)

300b)

600c)

1200d)

Q7

if the occupied bandwidth of an LTE radio channel is 9MHz, what is the nominal channel

bandwidth?

5MHza)

10MHzb)

20MHzc)

9MHzd)

Q8

which LTE physical channel provides a feedback mechanism for the HARQ process?

PDCCHa)

PCFICHb)

PDSCHc)

PFICHd)

Q9

the PBCCH carries basic system information and is transmitted every..

40mSa)

80mSb)

aperiodicallyc)

once per radio framed)





Q10

together the primary and secondary synchronisation channels carry one of, how many

physical layer identities?

3a)

504b)

168c)

1024d)

Q11

in the uplink the PUSCH carries user data and is assigned to the UE...

once per radio frame

once per sub-framee)

depends on application QoS and subscriber priorityf)

only on demand from the UEg)

Q12

the PBCH transport channel transmits the system information messages using which

modulation scheme?

BPSKa)

QPSKb)

16QAMc)

64QAMd)

Q13

which of the following LTE physical layer channels uses the Zadoff-Chu sequence?

PBCH and PPCHa)

PSS and SSSb)

PDSCHc)

PCFICHd)




LTE Radio Interface

Q14

how does the LTE UE detect the use of FDD or TDD transmission in LTE?

messages decoded from the MIB in the PBCHa)

precongured in the deviceb)

eNB pollingc)

blindly detect from the PSS and SSS locationd)

Q15

how does the LTE UE detect the system bandwidth in use?



eNB pollingc)


Q16

in LTE the physical layer power control, the parameter α determines what property of

power control?

the number of RB allocated to the UEa)

the transmit power control commandb)

the importance of the DL pathloss estimationc)

the allocated channel bandwidthd)

Q17

which physical layer process relives the upper layer CRC processing and can yield a

greater radio interface efciency?

modulationa)

adaptive modulation and codingb)

Hybrid ARQc)

ARQd)



LTE Procedures



Random Access.....

Q1

the procedure performed by the UE when moving from RRC_IDLE to RRC_CONNECTED

state is called?

UE registrationa)

TA updateb)

pagingc)

random accessd)

Q2

the random access procedure uses a 5 bit random preamble which is..

chosen by the UEa)

pre-coded in the UEb)

assigned by the EPCc)

calculated from the frame number d)

Q3

the random access response contains the RA-RNTI, what properties does this identity

have?

it is globally uniquea)

in contains the MAC address of the UEb)

it unambiguously identies the time-frequency resource used by the UE forc)

access

it contains and encrypted version of the subscriber IMSId)

Q4

when the random access procedure is used during the handover, it is likely to use..

non-contended accessa)

contended accessb)

special HO access procedurec)non-random accessd)




LTE Radio Interface

Q5

the random access procedure is likely to be used after which one of the following events?

UE registrationa)

data session setupb)

RRC reconnection after radio link failurec)

UE power switch off d)



LTE Procedures



Connection States and System Information.....

Q1

when the EPC has no specic knowledge of the UE or its location the UE is considered to

be in which mode?

LTE_Detacheda)

LTE_Attachedb)

LTE_Idlec)

LTE-Actived)

Q2

which type of system information block carries critical information and is retransmitted

every 40mS

SIB 1a)

SU 1b)

SIB 3c)

MIBd)

Q3

SIB 1, sometimes called the scheduling unit -1, is retransmitted every…

40mSa)

80mSb)

10mSc)

depends on the scheduling parametersd)

Q4

which of the following information is contained within the master information block, MIB

downlink system bandwidtha)

access classesb)

cell identityc)

one bit call barringd)




LTE Radio Interface

Q5

in which system information block would you nd information relating to the number of

transmit antennas supported by the eNB?

MIBa)

SIB1b)

SIB2c)

SIB3d)

Q6

how long is the system information received by the UE considered to be valid for?

1 hour a)

2 hoursb)

6 hoursc)

24 hoursd)





Q18

in HARQ processing any errored data is..

discarded and repeat data is requesteda)

buffered and combined with repeated datab)

discarded and no repeat data is requestedc)

passed to higher layer processes with out correctiond)






LTE Antenna Techniques.....

Q1

which of the following antenna techniques is likely to yield the greatest performance

improvement?

SISOa)

SIMOb)

MISOc)

MIMOd)

Q2

in closed loop MIMO the transmitter must..

transmit at a higher power across all antenna portsa)

have “knowledge” of the channel in order to apply some pre-codingb)

transmit only from a single antenna portc)

use higher order modulation schemes in order to scramble the data pathd)

Q3

using 4x4 MIMO what is the theoretical data rate that is possible with a 20MHz LTE radio

channel?

100Mbpsa)

172Mbpsb)

326Mbpsc)

1Gbpsd)

Q4

in a SISO conguration how many transmit and receive antennas are there?

1 Tx 1 Rxa)

1 Tx 2 Rxb)

2 Tx 1 Rxc)

2 TX 2 Rxd)




LTE Radio Interface

Q5

a MISO antenna conguration is better known as

spatial multiplexinga)

receive diversityb)

transmit diversityc)

polarisation diversityd)

Q6

transmit diversity is also known as..


receive diversityb)

spatial diversityc)

polarisation multiplexingd)

Q7

spatial diversity used in LTE radio systems improve the performance of the radio link in

what way?

increased throughput due to spatial multiplexinga)

increased coverage through higher SNRb)

increased capacity through lower SNRc)

increased spectral efciency through higher coding gainsd)

Q8

which of the following MIMO modes does not increase individual UE throughputs but offer

a higher cell capacity?

MISOa)

SU-MIMOb)

Co-MIMOc)

MU-MIMOd)






Q1

in an LTE radio channel of 5MHz bandwidth, how many occupied sub carriers are there?

72a)

300b)

600c)

1200d)

Q2

ISI occurs when..

time shifted version of the same symbol arrive at the antennaa)

pathloss exceeds 120dBb)

when frequency distortion due to Doppler effects are presentc)

when the BER exceed 10-6d)

Q3

a radio channel that is considered to be wideband..

is more likely to suffer from Doppler shifta)

is more likely to experience at fadingb)

is more likely to experience frequency selective fadingc)

is less likely to experience frequency selective fadingd)

Q4

the insertion of the cyclic prex in the LTE symbol prevents loss of orthogonality due to..

Doppler shifta)

inter sub-carrier interferenceb)

inter symbol interferencec)

frequency selective fadingd)




LTE Radio Interface

Q5

what spacing is the sub-carrier spacing in LTE?

15KHza)

200KHzb)

1.25MHzc)

5MHzd)

Q6

the high PAPR results in..

complex receiver designa)

poor multipath performanceb)

high power consumptionc)

potentially poor spectral efciencyd)

Q7

one sub carrier and one symbol create a..

resource blocka)

resource elementb)

tilec)

burstd)

Q8

OFDM or multi-carrier technology provides resilience against what radio interface effect?

tropospheric scatteringa)

fresnel clearanceb)

multi path fadingc)

pathlossd)

Q9

transmit diversity is also known as..


receive diversityb)

spatial diversityc)

polarisation multiplexingd)





Q10 which one of the following modulation schemes are supported by the LTE physical

layer?

OQPSKa)

8PSKb)

32QAMc)

64QAMd)

Q11

in order to counter the high power requirement of OFDM, LTE uses which scheme for the

uplink?

64QAMa)

OFDMAb)

SC-FDMAc)

SOFDMAd)

Q12

in HARQ processing any errored data is..

discarded and repeat data is requesteda)

buffered and combined with repeated datab)

discarded and no repeat data is requestedc)

passed to higher layer processes with out correctiond)

Q13

in the LTE physical layer, it is generally true that higher order modulation schemes such as

64QAM require…

higher transmitted power a)

greater FEC complexityb)

higher signal to noise ratioc)

multiple antennasd)




LTE Radio Interface

Q14

an LTE symbol has a duration of..

1mSa)

10mSb)

66.67µSc)

0.5mSd)

Q15

an LTE TTI consists of how many resource blocks

1a)

2b)

10c)

100d)

Q16

how many slots are there in an LTE sub-frame?

1a)

2b)

10c)

100d)

Q17

if the delay spread is 10nS and the symbol time is 1µS the radio channel is consider to

be..

narrowbanda)

widebandb)

Rayleigh fadedc)

Doppler shiftedd)





Q18

if the occupied bandwidth of an LTE radio channel is 9MHz, what is the nominal channel

bandwidth?

5MHza)

10MHzb)

20MHzc)

9MHzd)

Q19

the PBCCH carries basic system information and is transmitted every..

40mSa)

80mSb)

aperiodicallyc)

once per radio framed)

Q20

radio systems that make use of the OFDMA mechanism provide multiple access based

on..

time domain multiple access onlya)

frequency domain multiple access onlyb)

multiple access based on code divisionc)

both time and frequency domain multiple accessd)

Q21

together the primary and secondary synchronisation channels carry one of, how many

physical layer identities?

3a)

504b)

168c)

1024d)




LTE Radio Interface

Q22

MIMO systems make use of what type of overhead information in order to measure the

channel response?

reference signalsa)

training sequencesb)

synchronisation signalsc)

system information messagesd)

Q23

which of the following LTE physical layer channels uses the Zadoff-Chu sequence?

PBCH and PPCHa)

PSS and SSSb)

PDSCHc)

PCFICHd)

Q24

how does the LTE UE detect the use of FDD or TDD transmission in LTE?



eNB pollingc)


Q25

in LTE the physical layer power control, the parameter α determines what property of

power control?

the number of RB allocated to the UEa)

the transmit power control commandb)

the importance of the DL pathloss estimationc)

the allocated channel bandwidthd)





Q26

which of the following antenna techniques is likely to yield the greatest performance

improvement?

SISOa)

SIMOb)

MISOc)

MIMOd)

Q27

using 4x4 MIMO what is the theoretical data rate that is possible with a 20MHz LTE radio

channel?

100Mbpsa)

172Mbpsb)

326Mbpsc)

1Gbpsd)

Q28

a MISO antenna conguration is better known as


receive diversityb)

transmit diversityc)

polarisation diversityd)

Q29

which of the following MIMO modes does not increase individual UE throughputs but offer

a higher cell capacity?

MISOa)

SU-MIMOb)

Co-MIMOc)

MU-MIMOd)




LTE Radio Interface

Q30

which of the following best denes the operation of Co-MIMO

two eNB collaborating to transmit multiple streams to a single UEa)

one eNB exploiting the DL multipath to transmit to multiple UEsb)

one eNB exploiting the DL multipath to transmit to a single UEc)

two eNB exploiting the DL multipath to transmit to multiple UEsd)

Q31

what is the theoretical capacity gain of a 4 x 2 MIMO antenna conguration?

x 2a)

x 3b)

x 4c)

x 8d)





Q9

which of the following best denes the operation of Co-MIMO

two eNB collaborating to transmit multiple streams to a single UEa)

one eNB exploiting the DL multipath to transmit to multiple UEsb)

one eNB exploiting the DL multipath to transmit to a single UEc)

two eNB exploiting the DL multipath to transmit to multiple UEsd)

Q10

antenna systems that direct the radiated energy directly toward a UE location are referred

to as..

MIMOa)

diversity systemb)

beamformingc)

omni-directionald)

Q11

what is the theoretical capacity gain of a 4 x 2 MIMO antenna conguration?

x 2a)

x 3b)

x 4c)

x 8d)

Q12

in closed loop MIMO the transmitter must..

transmit at a higher power across all antenna portsa)

have “knowledge” of the channel in order to apply some pre-codingb)

transmit only from a single antenna portc)

use higher order modulation schemes in order to scramble the data pathd)



The LTE Protocols Layer 2 MAC, RLC and PDCP



Logical, Transport and Physical Channels in LTE.....

Q1

which of the following LTE protocol stack layers is responsible for mapping logical

channels to transport channels?

PHYa)

MACb)

RLCc)

PDCPd)

Q2

which of the following LTE protocol stack layers is responsible for error correction using

HARQ?

PHYa)

MACb)

RLCc)

PDCPd)

Q3

LTE channels that are dened by the type of information that they carry are referred to as?

logical channels

transport channelse)

physical channelsf)

radio bearersg)

Q4

LTE channels that dene the way in which information is transmitted are known as?

logical channelsa)

transport channelsb)

physical channelsc)

radio bearersd)




LTE Radio Interface

Q5

BCCH, PCCH and DCCH are all…

logical channelsa)


physical channelsc)

radio bearersd)

Q6

PDSCH, PDCCH and PBCH are all..

logical channelsa)


physical channelsc)

radio bearersd)

Q7

which logical channel is used to exchange signalling information between the UE and eNB

where no RRC connection is in place?

BCCHa)

MCCHb)

CCCHc)

DCCHd)

Q8

application level signalling such as SIP messages would be transferred using which

logical channel?

DCCHa)

CCCHb)

DTCHc)

MTCHd)





Q9

which of the following transport channels allow the dynamic use of resources, HARQ and

adaptive modulation and coding?

BCHa)

DL-SCHb)

PCHc)

RACHd)

Q10

which of the following transport channels has a xed format largely dened by the

requirement to ensure the signalling content can be decoded across the entire radio cell?

BCHa)

DL-SCHb)

PCHc)

RACHd)

Q11

which of the following physical channels are not mapped above the physical layer?

PBCHa)

PDSHb)

PRACHc)

PUCCHd)






MAC Layer Functions.....

Q1

in the MAC header which information element carries information relating to the round trip

delay in the channel?

logical channel identity elda)

buffer sizeb)

DRX command eldc)

timing advance eldd)

Q2

what is the name given to the MAC layer function that manages the packet data queues?

QoSa)

priority handlingb)

buffer controlc)

contention resolutiond)

Q3

CQI, QoS, MIMO rank and subscriber priority are all used by which MAC layer process?

QoSa)

priority handlingb)

buffer controlc)


Q4

incremental redundancy and chase combining are methods used by which MAC layer

function ?

forward error correctiona)


priority handlingc)

HARQd)




LTE Radio Interface

Q5

in the HARQ process retransmission in the downlink are..

synchronousa)

asynchronousb)

autonomousc)

automaticd)





SECTION 3

THE LTE PROTOCOLS LAYER 2 MAC,

RLC AND PDCP






RLC Functions.....

Q1

which of the following functions is carried out by the LTE RLC protocol layer?

logical to transport channel mappinga)

transport to physical channel mappingb)

acknowledged mode transfer of datac)

hybrid ARQ processesd)

Q2

which one of the following RLC data transfer modes is supported?

error control modea)

transport modeb)

unsequenced modec)

transparent moded)

Q3

when the LTE RLC protocol operates in acknowledged mode, which of the following

functions is supported?

unacknowledged data transfer a)

error checkingb)

retransmission requestsc)

header compressiond)

Q4

which RLC data transfer mode supports all of the following functions; segmentation,

reassembly, packet retransmission, packet sequencing?

UMa)

TMb)

AMc)

PMd)




LTE Radio Interface

Q5

in the RLC transparent mode data transfer which of the following frame headers are

present?

sequence number elda)

re-segmentation agb)

extension bitc)

there are no headersd)

Q6

the RLC function that assembles multiple SDUs in to a single RLC frame is known as?

segmentationa)

re-assemblyb)

concatenationc)

retransmissiond)

Q7

the size of the RLC frame is determined by…

the underlying layers, MAC and PHYa)

the applicationb)

QoS settingsc)

negotiated by the UEd)




LTE Radio Interface

Q13

MIMO systems make use of what type of overhead information in order to measure the

channel response?

reference signalsa)

training sequencesb)

synchronisation signalsc)


Q14

the UE reports the quality of the radio channel to the eNB via a..

PMIa)

rank indicationb)

measurement reportc)

CQId)






RRC Layer Functions.....

Q1

which of the following services are supported by the RRC layer?

establishment and released of radio resourcesa)

transport channel mappingb)

header compression and encryptionc)

authentication and admission controld)

Q2

which state is the UE RRC layer said to be in, when there is no RRC connection with the

network?

RRC_CONNECTEDa)

RRC_ACTIVEb)

RRC_IDLEc)

RRC_DETACHEDd)

Q3

if the UE is performing PLMN selections, monitoring paging channels, performing cell

reselections and decoding system information messages, which RRC state is being used?

RRC_CONNECTEDa)

RRC_ACTIVEb)

RRC_IDLEc)

RRC_DETACHEDd)

Q4

if the UE is considered to be in the LTE_DETATCHED state, what RRC state will the UE

be in?

RRC_IDLEa)

RRC_CONNECTEDb)

RRC_DETACHEDc)there is no RRC state denedd)




LTE Radio Interface

Q5

if the UE has a communication context with the network and is able to transmit or receive

data, what RRC state is the UE in?

RRC_CONNECTEDa)

RRC_ACTIVEb)

RRC_IDLEc)

RRC_DETACHEDd)

Q6

the LTE UE RRC states can be mapped to 2.5G/3G states, RRC_CONNECTED state can

be mapped to..

GSM_IDLE/GPRS packet_idlea)

CELL_PCHb)

CELL_FACHc)

GSM_CONNECTED/GPRS packet transfer moded)

Q7

Which SRB is used by the RRC to transfer low priority NAS messages?

SRB0a)

SRB1b)

SRB2c)

SRB2ad)

Q8

which SRB would be used to carry RRC messages and some piggybacked NAS

messages?

SRB0a)

SRB1b)

SRB2c)

SRB2ad)





Q9

what type of messages may be transferred using SRB0?

messages sent using the CCCH logical channela)

RRC messages sent in the DCCH logical channelb)

low priority NAS messages sent on the DCCHc)


Q10

a RB (not SRB) would be used to transfer what kind of data?




user plane trafc mapped to the DTCH logical channeld)






Q1

in the MAC header which information element carries information relating to the round trip

delay in the channel?

logical channel identity elda)

buffer sizeb)

DRX command eldc)

timing advance eldd)

Q2

a RB (not SRB) would be used to transfer what kind of data?




user plane trafc mapped to the DTCH logical channeld)

Q3

which of the following LTE protocol stack layers is responsible for error correction using

HARQ?

PHYa)

MACb)

RLCc)

PDCPd)

Q4

which of the following functions is carried out by the LTE PDCP protocol layer?

sequencing and duplicate detectiona)

error detection and retransmissionb)

logical channel mappingc)

packet reassemblyd)




LTE Radio Interface

Q5

LTE channels that dene the way in which information is transmitted are known as?

logical channelsa)


physical channelsc)

radio bearersd)

Q6

which one of the following RLC data transfer modes is supported?

error control modea)

transport modeb)

unsequenced modec)

transparent moded)

Q7

PDSCH, PDCCH and PBCH are all..

logical channelsa)


physical channelsc)

radio bearersd)

Q8

which logical channel is used to exchange signalling information between the UE and eNB

where no RRC connection is in place?

BCCHa)

MCCHb)

CCCHc)

DCCHd)





Q9

which of the following transport channels has a xed format largely dened by the

requirement to ensure the signalling content can be decoded across the entire radio cell?

BCHa)

DL-SCHb)

PCHc)

RACHd)

Q10

which of the following physical channels are not mapped above the physical layer?

PBCHa)

PDSHb)

PRACHc)

PUCCHd)

Q11

which of the following LTE protocol stack layers is responsible for mapping logical

channels to transport channels?

PHYa)

MACb)

RLCc)

PDCPd)

Q12

CQI, QoS, MIMO rank and subscriber priority are all used by which MAC layer process?

QoSa)

priority handlingb)

buffer controlc)





LTE Radio Interface

Q13

incremental redundancy and chase combining are methods used by which MAC layer

function ?

forward error correctiona)


priority handlingc)

HARQd)

Q14

which of the following functions is carried out by the LTE RLC protocol layer?

logical to transport channel mappinga)

transport to physical channel mappingb)

acknowledged mode transfer of datac)

hybrid ARQ processesd)

Q15

BCCH, PCCH and DCCH are all…

logical channelsa)


physical channelsc)

radio bearersd)

Q16

when the LTE RLC protocol operates in acknowledged mode, which of the following

functions is supported?

unacknowledged data transfer a)

error checkingb)

retransmission requestsc)

header compressiond)





Q17

which state is the UE RRC layer said to be in, when there is no RRC connection with the

network?

RRC_CONNECTEDa)

RRC_ACTIVEb)

RRC_IDLEc)

RRC_DETACHEDd)

Q18

in the RLC transparent mode data transfer which of the following frame headers are

present?

sequence number elda)

re-segmentation agb)

extension bitc)

there are no headersd)

Q19

the RLC function that assembles multiple SDUs in to a single RLC frame is known as?

segmentationa)

re-assemblyb)

concatenationc)

retransmissiond)

Q20

what header compression mechanism is supported by the ROHC function?

RFC 1142a)

V.42bisb)

ROHCc)

bit puncturingd)




LTE Radio Interface

Q21

which of the following protocol headers can be compressed by the PDCP compression

function?

TCP and IPa)

MAC and RLCb)

HTTP and SMTPc)

FTP and DHCPd)

Q22

if the UE has a communication context with the network and is able to transmit or receive

data, what RRC state is the UE in?

RRC_CONNECTEDa)

RRC_ACTIVEb)

RRC_IDLEc)

RRC_DETACHEDd)

Q23

the PDCP protocol layer provides encryption functions but which of the following

information will be encrypted?

RLC and MACa)

PHY signalsb)

SIP and RTPc)


Q24

application level signalling such as SIP messages would be transferred using which

logical channel?

DCCHa)

CCCHb)

DTCHc)

MTCHd)





Q25

fully compressed packets are exchanged by the PDCP compression function when both

peer layer are in which mode?

no contexta)

initial contextb)

full contextc)

packet actived)

Q26

when RTP, UDP and IP are used there can be up to 40 bytes of information in the header,

ROHC compression could reduce this information to…

6 bitsa)

6 bytesb)

40 bitsc)

40 bytesd)

Q27

which of the following services are supported by the RRC layer?

establishment and released of radio resourcesa)

transport channel mappingb)

header compression and encryptionc)

authentication and admission controld)

Q28

if the UE is performing PLMN selections, monitoring paging channels, performing cell

reselections and decoding system information messages, which RRC state is being used?

RRC_CONNECTEDa)

RRC_ACTIVEb)

RRC_IDLEc)

RRC_DETACHEDd)




LTE Radio Interface

Q29

if the UE is considered to be in the LTE_DETATCHED state, what RRC state will the UE

be in?

RRC_IDLEa)

RRC_CONNECTEDb)

RRC_DETACHEDc)

there is no RRC state denedd)

Q30

the PDCP function that allows detection of message manipulation and “man-in-the-middle”

attacks is known as?

encryptiona)

message integrity checkingb)

ARQc)

authorisationd)

Q31

which RLC data transfer mode supports all of the following functions; segmentation,

reassembly, packet retransmission, packet sequencing?

UMa)

TMb)

AMc)

PMd)

Q32

which SRB is used by the RRC to transfer low priority NAS messages?

SRB0a)

SRB1b)

SRB2c)

SRB2ad)





Q33

which SRB would be used to carry RRC messages and some piggybacked NAS

messages?

SRB0a)

SRB1b)

SRB2c)

SRB2ad)

Q34

what type of messages may be transferred using SRB0?







LTE Procedures


SECTION 4

LTE PROCEDURES



LTE Procedures



Cell Selection and Reselection.....

Q1

a UE may make a PLMN selection based on..

signalling from the EPCa)

information stored on the SIM and/or best cell rankingb)

cell identityc)

user identityd)

Q2

which of the following cell ranking is consider the highest (best) by the UE?

suitable cella)

acceptable cellb)

reserved cellc)

barred celld)

Q3

UE will rank cells for selection based on which calculated parameter?

Qrxlevmina)

Pcompensationb)

Qrxlevmeasc)

Srxlevd)

Q4

the calculated parameters or Rs and Rn are use by the UE during which process

cell selectiona)

handover b)

measurement reportingc)

cell re-selectiond)




LTE Radio Interface

Q5

cell re-selection will take place when..

Rs > Rna)

Rn > Rsb)

Rn = Rsc)

a new PLMN is detectedd)

Q6

the re-selection parameters Tre-selection

and Qhyst scaled according the..

number of cells in the neighbour cell lista)

relative received signal strength of the serving and neighbour cellsb)

mobility state of the UE, high, med, lowc)

level of trafc in the neighbour cellsd)

Q7

when the UE is in the RRC_CONNECTED state the radio access network knows where

the UE is on a…

system level basisa)

RNC level basisb)

tracking area basisc)

cell level basisd)

Q8

the EPC records the location of the user down to a…

cell areaa)

location areab)

tracking areac)

registration aread)

Q9

the UE will perform tracking area updates…

when battery level is lowa)

on request by the user b)

at initial registrationc)

before establishing an EPS bearer d)






PDCP Layer Functions.....

Q1

which of the following functions is carried out by the LTE PDCP protocol layer?

sequencing and duplicate detectiona)

error detection and retransmissionb)

logical channel mappingc)

packet reassemblyd)

Q2

what header compression mechanism is supported by the ROHC function?

RFC 1142a)

V.42bisb)

ROHCc)

bit puncturingd)

Q3

which of the following protocol headers can be compressed by the PDCP compression

function?

TCP and IPa)

MAC and RLCb)

HTTP and SMTPc)

FTP and DHCPd)

Q4

the PDCP protocol layer provides encryption functions but which of the following

information will be encrypted?

RLC and MACa)

PHY signalsb)

SIP and RTPc)




LTE Procedures


Q10

when the UE is registered to multiple tracking areas…

it must perform TA updates when ever it changes TAa)

will not perform TA updates whilst moving between the register areasb)

will perform TA updates only when instructed by the EPCc)

will only perform periodic TA updatesd)



LTE Procedures



RRC Connections, Security and Handover.....

Q1

after the UE and eNB have exchanged the RRC Connection Request, RRC connection

Setup and RRC connection Setup Complete messages, what RRC state will the UE be in?

RRC_CONNECTEDa)

RRC_IDLEb)

LTE_IDLEc)

EMM_REGISTEREDd)

Q2

which of the following purposes does the Registration procedure serve?

exchange of user dataa)

mutual UE-EPC authenticationb)

conguration of QoS parametersc)

setup of VoIP connectionsd)

Q3

the registration procedure messages are exchanged between..

the UE and eNBa)

the UE and SGWb)

the UE and MMEc)

the UE and PGWd)

Q4

during the registration procedure the UE establishes a data connection with the SWG and

PGW, what is the name given to this connection.

data sessiona)

PDP contextb)

initial bearer c)

packet data connectiond)




LTE Radio Interface

Q5

what is the purpose of the initial bearer setup during the registration of the UE?

allows immediate access to the interneta)

higher layer applications use this to register their services, e.g. email, SIPb)

to allow the negotiation of further RRC resourcesc)

to allow registration on the 2G/3G networkd)

Q6

the security mechanisms used in LTE registration are similar to the procedures used in?

GSMa)

GPRSb)

UMTSc)

TETRAd)

Q7

what two values are compared in the EPC to process the authentication of the UE?

AUTN and RANDa)

RAND and RESb)

RES and AUTNc)

RES and XRESd)

Q8

in LTE, which network node will make the handover decisions?

MMEa)

UEb)

SGWc)

eNBd)

Q9

LTE handover are likely to use which network interface ?

S1-MMEa)

S1-Ub)

X2c)

S6d)



LTE Procedures


Q10

gap assisted measurements to assist with the LTE handover are likely to be used under

which scenario?

intra-frequency measurement where channel bandwidths are the samea)

intra-frequency measurements where channel bandwidths are differentb)

inter-frequency measurements where channel bandwidths are the samec)

intra-frequency measurements on adjacent sectorsd)



LTE Procedures



Q1

the EPC records the location of the user down to a…

A cell areaa)

B location areab)

C tracking areac)

D registration aread)

Q2

which of the following cell ranking is consider the highest (best) by the UE?

A suitable cella)

B acceptable cellb)

C reserved cellc)

D barred celld)

Q3

when the EPC has no specic knowledge of the UE or its location the UE is considered to

be in which mode?

A LTE_Detacheda)

B LTE_Attachedb)

C LTE_Idlec)

D LTE-Actived)

Q4

which of the following information is contained within the master information block, MIB

A downlink system bandwidtha)

B access classesb)

C cell identityc)

D one bit call barringd)




LTE Radio Interface

Q5

how long is the system information received by the UE considered to be valid for?

A 1 hour a)

B 2 hoursb)

C 6 hoursc)

D 24 hoursd)

Q6

when the random access procedure is used during the handover, it is likely to use..

non-contended accessa)

contended accessb)

special HO access procedurec)

non-random accessd)

Q7

the calculated parameters or Rs and Rn are use by the UE during which process

cell selectiona)

handover b)

measurement reportingc)

cell re-selectiond)

Q8

gap assisted measurements to assist with the LTE handover are likely to be used under

which scenario?

intra-frequency measurement where channel bandwidths are the samea)

intra-frequency measurements where channel bandwidths are differentb)

inter-frequency measurements where channel bandwidths are the samec)

intra-frequency measurements on adjacent sectorsd)

Q9

the re-selection parameters Tre-selection

and Qhyst scaled according the..

number of cells in the neighbour cell lista)

relative received signal strength of the serving and neighbour cellsb)

mobility state of the UE, high, med, lowc)

level of trafc in the neighbour cellsd)



LTE Procedures


Q10

SIB 1, sometimes called the scheduling unit -1, is retransmitted every…

40mSa)

80mSb)

10mSc)

depends on the scheduling parametersd)

Q11

the procedure performed by the UE when moving from RRC_IDLE to RRC_CONNECTED

state is called?

UE registrationa)

TA updateb)

pagingc)

random accessd)

Q12

cell re-selection will take place when..

Rs > Rna)

Rn > Rsb)

Rn = Rsc)

a new PLMN is detectedd)

Q13

the random access procedure uses a 5 bit random preamble which is..

chosen by the UEa)

pre-coded in the UEb)

assigned by the EPCc)

calculated from the frame number d)




LTE Radio Interface

Q14

the random access response contains the RA-RNTI, what properties does this identity

have?

it is globally uniquea)

in contains the MAC address of the UEb)

it unambiguously identies the time-frequency resource used by the UE forc)

access

it contains and encrypted version of the subscriber IMSId)

Q15

after the UE and eNB have exchanged the RRC Connection Request, RRC connection

Setup and RRC connection Setup Complete messages, what RRC state will the UE be in?

RRC_CONNECTEDa)

RRC_IDLEb)

LTE_IDLEc)

EMM_REGISTEREDd)

Q16

a UE may make a PLMN selection based on..

signalling from the EPCa)

information stored on the SIM and/or best cell rankingb)

cell identityc)

user identityd)

Q17

during the registration procedure the UE establishes a data connection with the SWG and

PGW, what is the name given to this connection.

data sessiona)

PDP contextb)

initial bearer c)

packet data connectiond)



LTE Procedures


Q18

which of the following purposes does the Registration procedure serve?

exchange of user dataa)

mutual UE-EPC authenticationb)

conguration of QoS parametersc)

setup of VoIP connectionsd)

Q19

what is the purpose of the initial bearer setup during the registration of the UE?

allows immediate access to the interneta)

higher layer applications use this to register their services, e.g. email, SIPb)

to allow the negotiation of further RRC resourcesc)

to allow registration on the 2G/3G networkd)

Q20

the security mechanisms used in LTE registration are similar to the procedures used in?

GSMa)

GPRSb)

UMTSc)

TETRAd)

Q21

in LTE, which network node will make the handover decisions?

MMEa)

UEb)

SGWc)

eNBd)

Q22

the UE will perform tracking area updates…

when battery level is lowa)

on request by the user b)

at initial registrationc)

before establishing an EPS bearer d)



LTE Radio Interface

Q5

the PDCP function that allows detection of message manipulation and “man-in-the-middle”

attacks is known as?

encryptiona)

message integrity checkingb)

ARQc)

authorisationd)

Q6

the ROHC is a 3 state machine, which of the following are the 3 possible states?

sleep, idle and activea)

off, idle and onb)

no context, initial context, full contextc)

null, unregistered and registeredd)

Q7

fully compressed packets are exchanged by the PDCP compression function when both

peer layer are in which mode?

no contexta)

initial contextb)

full contextc)

packet actived)

Q8

when RTP, UDP and IP are used there can be up to 40 bytes of information in the header,

ROHC compression could reduce this information to…

6 bitsa)

6 bytesb)

40 bit)

LTE Module 2 MCQ Answers

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