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LDCE Wireless > LTE Advanced > Flashcards

LTE Advanced Flashcards

1
Q

IMT stands for

A

International Mobile telecommunication

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2
Q

International Telecommunication Union using Radio (ITU-R) defined 4G mobile technology as ________
1) IMT-2000
2) IMT-Advanced
3) IMT-2020

A

IMT-Advanced
(IMT-2000 is for 3G andIMT-2020 is for 5G)

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3
Q

IMT advanced requirement
data rate ______ for low mobility and _______ for high mobility
1) 100Mbps, 10Mbps
2) 100Mbps, 100Mbps
3) 1Gbps, 100Mbps
4) 1Gbps, 1Gbps

A

1 Gbps for low mobility and
100Mbps for high mobility

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4
Q

IMT advanced requirement
support for high mobility up to ____km/hr
1) 100 km/hr
1) 250 km/hr
1) 350 km/hr
1) 500 km/hr

A

350 km/hr

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5
Q

IMT advanced requirement
spectral efficiency ______ for downlink and ________ for uplink
1) 5bps/Hz, 1.5bps/Hz
1) 10bps/Hz, 3.2bps/Hz
1) 15bps/Hz, 6.7bps/Hz
1) 20bps/Hz, 9.8bps/Hz

A

15bps/Hz for downlink and
6.7bps/Hz for uplink

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6
Q

IMT advanced requirement
Low latency U-plane < __ms and C-plane < __ms
1) 100, 200
2) 10, 100
3) 100, 10
4) 200, 100

A

U-plane < 10ms and
C-plane < 100ms

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7
Q

IMT advanced requirement
___ VoIP users per sector/MHz
1) 20
2) 40
3) 60
4) 80

A

40 VoIP users per sector/MHz

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8
Q

IMT advanced requirement handover interruption ____ for intra-frequency and ____ for inter-frequency
1) 15.5ms, 30ms
1) 27.5ms, 40ms
1) 40ms, 60ms
1) 55ms, 65ms

A

<27.5ms for intra-frequency and
<40ms for inter-frequency

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9
Q

LTE multiple-access technologies are
1) downlink: SC-FDMA, uplink: SC-FDMA
2) downlink: SC-FDMA, uplink: SC-OFDMA
3) downlink: OFDMA, uplink: SC-FDMA
4) downlink: OFDMA, uplink: OFDMA

A

downlink: OFDMA,
uplink: SC-FDMA

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10
Q

choose correct
1) 1G/2G has circuit core only
2) 2.5G/3G has circuit and packet core
3) 4G has packet core only
4) all the above

A

All the above

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11
Q

LTE-Advanced in release 10 allows
1) frequency-selective scheduling in uplink
2) allowed carriers along contiguous block of spectrum

A

frequency-selective scheduling in uplink.
Release 10 introduces clustered SC-FDMA in uplink.

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12
Q

LTE in release 8 allows
1) frequency-selective scheduling in uplink
2) allowed carriers along contiguous block of spectrum

A

allowed carriers along contiguous block of spectrum

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13
Q

LTE-Advanced allows
1) downlink: 4X4 MIMO, uplink: 4X4 MIMO
2) downlink: 4X4 MIMO, uplink: 8x8 MIMO
3) downlink: 8x8 MIMO, uplink: 8x8 MIMO
4) downlink: 8x8 MIMO, uplink: 4X4 MIMO

A

downlink: 8x8 MIMO, uplink: 4X4 MIMO

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14
Q

_______ are used for extending the coverage of main eNB in low coverage environment
1) relay nodes
2) umbrella cells

A

The relay nodes or low power eNBs

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15
Q

The relay nodes are connected to Donor eNB (DeNB) through ___ interface
1) Un
2) Uu
3) Ur

A

Un interface

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16
Q

LTE-Advanced in release 10 introduces
1) relay nodes
2) eICIC
3) clustered SC-FDMA in uplink
4) carrier aggregation (CA)
5) Support for Heterogeneous Networks
6) all the above

A

all the above

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17
Q

_____introduced in 3GPP release 10 to deal with interference issues in
Heterogeneous Networks (HetNet)
1) relay nodes
2) eICIC
3) clustered SC-FDMA in uplink
4) carrier aggregation (CA)

A

eICIC

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18
Q

eICIC mitigates interference on
1) traffic channels
2) control channels
3) both

A

both

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19
Q

eICIC uses ______ to mitigate intra-frequency interference in heterogeneous networks
1) power
2) frequency
3) time domain
4) all the above

A

all the above

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20
Q

An eNB sends a “______” message to the neighbore NB about interference level per physical resource block.
1) interference imformation
2) load information
3) congestion imformation
4) resource information

A

“load information”.
message to the neighbore NB about
interference level per physical resource block. The neighbor adjusts DL power levels at those blocks

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21
Q

Only control channels and cell-specific pilots, no user data. Allows UEs in CRE region to mitigate macro-cell interference
1) ABS
2) CA
3) SDCCH

A

Almost Blank Subframes (ABS)

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22
Q

a cost effective way for operators to utilize their fragmented spectrum spread across different or same bands in order to improve end
user throughput
1) relay nodes
2) eICIC
3) clustered SC-FDMA in uplink
4) carrier aggregation (CA)

A

carrier aggregation (CA)

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23
Q

Each individual RF carrier in carrier aggregation is known as a
1) sub carrier
1) component carrier
1) traffic carrier
1) multiplexed carrier

A

Component Carrier

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24
Q

The release 10 version of the 3GPP specifications defines signalling to support up to
1) 4 Component Carriers (Bandwidth:80MHz)
2) 5 Component Carriers (Bandwidth:100MHz)
3) 10 Component Carriers (Bandwidth:200MHz)
4) 3 Component Carriers (Bandwidth:60MHz)

A

5 Component Carriers (Bandwidth:100MHz)

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25
Q

The release 10 version of the 3GPP specifications defines individual
Component Carriers to be
1) backwards compatible
2) forward compatible

A

backwards compatible, so they can be used by release 8 and release 9 devices

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26
Q

Component Carriers
1) need to be adjacent
2) can be located in different operating bands

A

can be located in different operating bands.
need not to be adjacent.

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27
Q

The combination of large macro cells with small cells results in _____networks.
1) homogeneous networks
2) heterogeneous networks

A

heterogeneous networks

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28
Q

CoMP transmission stands for

A

Coordinated multi-point transmission

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29
Q

CoMP is used in
1) uplink (reception)
2) downlink (transmission)
3) both

A

both

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30
Q

Joint transmission from multiple cells (like soft handover)
1) carrier aggregation (CA)
2) eICIC
3) CoMP
4) none

A

CoMP transmission
(Coordinated multi-point)

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31
Q

Central eNodeB combines received
signals (like soft handover)
1) carrier aggregation (CA)
2) eICIC
3) CoMP
4) none

A

CoMP reception
(Coordinated multi-point)

32
Q

DPS (Dynamic Point Selection)
1) carrier aggregation (CA)
2) eICIC
3) CoMP transmission
4) CoMP reception

A

CoMP transmission
(Coordinated multi-point)

33
Q

SSPS (semi-static point selection)
1) carrier aggregation (CA)
2) eICIC
3) CoMP transmission
4) CoMP reception

A

CoMP reception
(Coordinated multi-point)

34
Q

Transmission to a UE from one point only; suchpoint is changed semi-statically
1) SSPS
2) eICIC
3) CA

A

SSPS (semi-static point selection)

35
Q

eICIC stands for

A

enhanced inter-cell interference coordination

36
Q

eICIC introduced in 3GPP release 10 to deal with interference issues in 1)
1) Homogeneous networks
2) Heterogeneous Networks

A

Heterogeneous Networks (HetNet)

37
Q

Release ___ will mark the start of 5G work in 3GPP
1) Release 13
2) Release 14
3) Release 15

A

Release 14

38
Q

SON stands for

A

Self Organizing Network

39
Q

SON involves
1) Self configuration
2) Seld optimization
3) Self-healing
4) all the above

A

all the above

40
Q

LTE advanced considers SON feature
1) Self configuration
2) Seld optimization
3) Self-healing

A

Self-healing

41
Q

With CoMP transmission, the transmitter can share data load even if they are not collocated

A

T
CoMP: Coordinated Multi-Point

42
Q

_______ introduced in 3GPP release 11 to increase control channel capacity
1) carrier aggregation (CA)
2) eICIC
3) CoMP
4) ePDCCH

A

ePDCCH (enhanced PDCCH)
ePDCCH uses PDSCH resources for transmitting control information unlike
release 8 PDCCH which can only use control region of subframes

43
Q

In LTE release 11, support for ____is added
1) uplink positioning
2) downlink positioning

A

uplink positioning

44
Q

____ wireless systems can be viewed as a logical extension to the smart antennas
1) MIMO
2) CoMP
3) Carrier aggregation

A

MIMO

45
Q

Previously these multiple paths only served to introduce interference. By using _______, these additional paths can be used to advantage
1) MIMO
2) CoMP
3) Carrier aggregation

A

MIMO

46
Q

MIMO wireless technology is able to
considerably increase the capacity of a given channel while still obeying Shannon’s law.

A

T

47
Q

Where there are more than one antenna at either end of the radio link, this is termed
1) MIMO
2) CoMP
3) Carrier aggregation

A

MIMO

48
Q

MIMO provides improvements in
1) channel robustness
2) channel throughput
3) both

A

both channel robustness as well as channel throughput.

49
Q

In any case for MIMO spatial multiplexing the number of receive antennas must be ____ the number of transmit antennas.
1) equal to or greater than
2) equal to or less than
3) both

A

equal to or greater than

50
Q

_______ codes are used for MIMO systems to enable the transmission of multiple copies of a data stream across a number of antennas
1) carrier-time block codes
2) carrier-space block codes
3) space-time block codes
4) frequency-time block codes

A

Space-time block codes (STBC)

51
Q

A space time block code is usually represented by a matrix. Each row represents a ______ and each column represents _________
1) one antenna’s transmissions over time, time slot
2) time slot, one antenna’s transmissions over time

A

time slot, one antenna’s transmissions over time

52
Q

The _______ scheme is an ingenious transmit diversity scheme for two transmit antennas that does not require transmit channel knowledge
1) MIMO Alamouti
2) Adaptive array systems
3) Phased array systems

A

MIMO Alamouti

53
Q

Alamouti scheme performs beamforming in time by adjusting the weights in ______ domain
1) time
2) space

A

time domain instead of the usual spatial domain.

54
Q

Beamforming van be used with _______
1) MIMO only
2) any antenna system

A

2) any antenna system

55
Q

Smart antennas can be divided into two groups
1) Phased array systems
2) __________

A

Adaptive array systems (AAS)

56
Q

Smart antennas can be divided into two groups
1) _________
2) Adaptive array systems (AAS)

A

Phased array systems

57
Q

This smart antenna has a number of pre-defined patterns
1) Phased array systems
2) Adaptive array systems (AAS)

A

Phased array systems

58
Q

This smart antenna has an infinite number of patterns
1) Phased array systems
2) Adaptive array systems (AAS)

A

Adaptive array systems (AAS)

59
Q

______ move the beam in real time
1) Phased array systems
2) Adaptive array systems (AAS)

A

Adaptive array systems (AAS)

60
Q

MU-MIMO stands for

A

Multi-user MIMO

61
Q

_______ is often considered as an extension of Space Division Multiple Access, SDMA
1) SU-MIMO
2) CP-OFDM
3) MU-MIMO
4) SC-FDMA

A

MU-MIMO

62
Q

________ provides capacity gain
1) SU-MIMO
2) MU-MIMO

A

MU-MIMO

63
Q

_____ provides increased data rate for the single user
1) SU-MIMO
2) MU-MIMO

A

SU-MIMO

64
Q

Multiplexing gain referes to
1) SU-MIMO
2) MU-MIMO

A

MU-MIMO

65
Q

Interference reduction referes to
1) SU-MIMO
2) MU-MIMO

A

SU-MIMO

66
Q

MU-MIMO provides a higher throughput when the signal to noise ratio is_______ as compared to SU-MIMO
1) low
2) high

A

high

67
Q

SU-MIMO provides a higher throughput when the signal to noise ratio is_______ as compared to MU-MIMO
1) low
2) high

A

low

68
Q

Perfect CSI (Channel State Information) is required for
1) SU-MIMO
2) MU-MIMO

A

MU-MIMO

69
Q

No CSI (Channel State Information) is needed for
1) SU-MIMO
2) MU-MIMO

A

SU-MIMO

70
Q

MIMO-MAC stands for

A

Multiple Access Channel (uplink)

71
Q

MIMO-BC stands for

A

Broadcast Channel (downlink)

72
Q

MU-MIMO uplink is
1) Multiple Access Channel (MAC)
2) Broadcast Channel (BC)

A

Multiple Access Channel

73
Q

MU-MIMO downlink is
1) Multiple Access Channel (MAC)
2) Broadcast Channel (BC)

A

Broadcast Channel

74
Q

MU-MIMO pre-interference cancellation techniques known as _________
1) Dirty Paper Coding
2) space time block coding
3) Beamforming

A

Dirty Paper Coding (DPC)
The technique consists of precoding the data in order to cancel the interference.

75
Q

some propagation issues like channel rank loss and antenna correlation affects less in
1) SU-MIMO
2) MU-MIMO

A

MU-MIMO

76
Q

CSI (Channel State Information) requires the use of the available bandwidth which is a disadvantage for
1) SU-MIMO
2) MU-MIMO

A

MU-MIMO

77
Q

_____ is used to mitigate macro-cell interference
1) ABS
2) CA
3) SDCCH

A

Almost Blank Subframes (ABS)

LDCE Wireless (15 decks)

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