LTE Advanced Flashcards by Prabhash K P

IMT stands for

International Mobile telecommunication

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

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

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

1 Gbps for low mobility and
100Mbps for high mobility

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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

350 km/hr

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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

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

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

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

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

40 VoIP users per sector/MHz

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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

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

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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

downlink: OFDMA,
uplink: SC-FDMA

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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

All the above

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

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

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

allowed carriers along contiguous block of spectrum

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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

downlink: 8x8 MIMO, uplink: 4X4 MIMO

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

The relay nodes or low power eNBs

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

Un interface

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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

all the above

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_____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)

eICIC

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

both

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

all the above

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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

“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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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

Almost Blank Subframes (ABS)

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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)

carrier aggregation (CA)

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

Component Carrier

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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)

5 Component Carriers (Bandwidth:100MHz)

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

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

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

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

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

heterogeneous networks

CoMP transmission stands for

Coordinated multi-point transmission

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

both

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

CoMP transmission (Coordinated multi-point)

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

CoMP reception (Coordinated multi-point)

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

CoMP transmission (Coordinated multi-point)

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

CoMP reception (Coordinated multi-point)

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

SSPS (semi-static point selection)

eICIC stands for

enhanced inter-cell interference coordination

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

Heterogeneous Networks (HetNet)

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

Release 14

SON stands for

Self Organizing Network

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

all the above

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

Self-healing

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

T CoMP: Coordinated Multi-Point

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

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

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

uplink positioning

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

MIMO

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

MIMO

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

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

MIMO

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

both channel robustness as well as channel throughput.

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

equal to or greater than

_______ 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

Space-time block codes (STBC)

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

time slot, one antenna's transmissions over time

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

MIMO Alamouti

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

time domain instead of the usual spatial domain.

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

2) any antenna system

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

Adaptive array systems (AAS)

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

Phased array systems

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

Phased array systems

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

Adaptive array systems (AAS)

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

Adaptive array systems (AAS)

MU-MIMO stands for

Multi-user MIMO

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

MU-MIMO

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

MU-MIMO

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

SU-MIMO

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

MU-MIMO

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

SU-MIMO

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

high

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

low

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

MU-MIMO

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

SU-MIMO

MIMO-MAC stands for

Multiple Access Channel (uplink)

MIMO-BC stands for

Broadcast Channel (downlink)

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

Multiple Access Channel

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

Broadcast Channel

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

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

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

MU-MIMO

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

MU-MIMO

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

Almost Blank Subframes (ABS)