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LDCE Wireless > Backhaul Media & KPI > Flashcards

Backhaul Media & KPI Flashcards

1
Q

a transport network that connects the macro cell to the small cells
1) fronthaul
2) backhaul

A

fronthaul

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2
Q

_____ became a necessary addition when a new link connected centralized BBU to individual RRH
1) fronthaul
2) backhaul

A

fronthaul

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3
Q

Front haul is connection in RAN infrastructure between the ___ and ____
1) BSC and BTS
2) BBU and RRH

A

Baseband Unit (BBU) and Remote Radio Head (RRH)

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4
Q

BBU and RRH stand for

A

Baseband Unit (BBU) and Remote Radio Head (RRH)

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5
Q

Backhaul links using the V-band or the E-band are well suited to supporting ____
1) 3G
2) 4G
3) 5G

A

suited to supporting 5G due to their 10 Gbps to 25 Gbps data throughput capabilities

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6
Q

Microwave can be used in ____ mode
a) LOS
b) NLOS
c) either a or b
d) none

A

either a or b

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7
Q

Microwave can be used in
a) chain
2) mesh
3) ring
4) all the above

A

all the above

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8
Q

____ provides a level of tolerance to multi-path fading not possible with LOS
1) QPSK
2) QAM
3) OFDM
4) TDM

A

OFDM

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9
Q

partitioning of physical network infrastructure into logical networks is
1) network slicing
2) multiplexing

A

network slicing

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10
Q

Architectures for mobile backhaul optimization
1) MEC (Multi-access edge computing)
2) Cloud RAN
3) both
4) none

A

both

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11
Q

heterogeneous networks with many
small cells would benefit from this architecture.
1) MEC (Multi-access edge computing)
2) Cloud RAN
3) both
4) none

A

Cloud RAN

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12
Q

suitable in the small cell era, may not be suitable for traditional microcell base stations
1) MEC (Multi-access edge computing)
2) Cloud RAN
3) both
4) none

A

Cloud RAN

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13
Q

Cloud RAN The ___________ is where only the physical layer is processed at the cell site while all the electronics are concentrated in the edge site
1) low-level split
2) high-level split

A

low-level split

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14
Q

low-level split ______ (increases/decreases) fronthaul cost with _____ (higher/lower) complexity at cell site.

A

increases fronthaul cost
lower complexity at cell site

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15
Q

high-level split ______ (increases/decreases) fronthaul cost with _____ (higher/lower) complexity at cell site.

A

decreases fronthaul cost
higher complexity at cell site

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16
Q

_____ is used to extend the coverage of a BTS/NodeB/eNodeB like rural areas or tunnels
1) RAN
2) RRH
3) BBU

A

Remote Radio Head (RRH)

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17
Q

RRH is generally connected to the BTS/NodeB/eNodeB via a fibre optic cable using ___________ protocols
1) HDLS
2) CPRI
3) SSL

A

Common Public Radio Interface (CPRI)

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18
Q

1) RRH make MIMO operation easier
2) RRH uses GaN RF power devices
3) RRH uses envelope tracking technology within the RRH RF power amplifier (RFPA)
4) all the above

A

all the above

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19
Q

RRHs will use the latest RF component technology including _________ RF power devices
1) Gallium nitride (GaN)
2) GaAs

A

Gallium nitride (GaN)

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20
Q

Fourth generation (4G) and beyond infrastructure deployments will include Fiber to the Antenna (FTTA). It has
1) lower power requirements
2) distributed antenna sites
3) reduced base station footprint
4) all the above

A

4) all the above

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21
Q

_____ are set of quantifiable measures to gauge or compare performance in terms of meeting
mobile network’s strategic and operational goals
1) KPI
2) Power levels
3) call drop rate

A

Key Performance Indicators (KPI) also called “Key Success Indicators
(KSI)”

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22
Q

The KPIs are available in report form through _______
1) BTS
2) BSC
3) OMC

A

OMC

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23
Q

RF Optimizer makes frequent use of statistical data for routine optimization activities

A

T

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24
Q

MS usually seizes SDCCH to exchange signaling during
1) Location update
2) set up of MO and MT calls
3) SMS
4) All the above

A

All the above

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25
Q

SMS is also sent/delivered through ______ channel
in idle mode
1) TCH
2) BCCH
3) SDCCH

A

SDCCH

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26
Q

SDCCH congestion reasons
1) Too many location update at LAC boundaries
2) Too much SMS traffic
3) Hardware fault in TRX or transmission system (Abis link etc.)
4) Unreasonable setting of system parameters and RACH parameters
5) All the above

A

All the above

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27
Q

congestion due to too many location update at LAC boundaries can be solved by
1) Adjust LAC selection and/or modify LAC boundaries
2) Adjust CRH (Cell Reselection Hysteresis)
3) Adjust parameter setting of periodic location update timer (T3212)
4) All the above

A

All the above

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28
Q

congestion due to too much SMS traffic can be solved by
1) Implement dynamic SDCCH allocation mode
2) Increase SDCCH channels
3) both

A

both

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29
Q

Adjusting _____reduces frequent location update at LAC boundaries
1) Power level
2) Range
3) CRH

A

CRH (Cell Reselection Hysteresis)

30
Q

The Main Reasons for High SDCCH Drop Rate are
1) improper Parameters Configuration
2) Bad RF & Environmental factors
3) both

A

both

31
Q

High SDCCH Drop Rate can be caused by
1) High VSWR due to feeders
2) interference from repeaters (Intra-Network & Inter-Network)
3) Low coverage
4) improper neighbor Relations
5) all the above

A

all the above

32
Q

SDCCH congestion rate day average value should be ≤ _%
1) 1%
2) 2%
3) 3%
4) 5%

A

1%

33
Q

TCH congestion rate day average value should be ≤ _%
1) 1%
2) 2%
3) 3%
4) 5%

A

2%

34
Q

TCH congestion optimization includes
1) increase no. of TRX in the cell (If possible)
2) Implement Half Rate/AMR-Half Rate if already maximum no. of TRX is equipped
3) both

A

both

35
Q

No. of TCH required according to traffic can be
analyzed from ________ table
1) Traffic analyzer table
2) Erlang-B table
3) Erlang-A table
4) Erlang-traffic table

A

Erlang-B table

36
Q

_________ indicates the probability of successful calls initiated by MS
1) RLT
2) CSSR
3) FER
4) HOSR

A

CSSR (Call Setup Success Rate)

37
Q

CSSR rate day average value should be __
1) >=90%
2) >=95%
3) >=99%

A

> =95%
CSSR (Call Setup Success Rate)

38
Q

CSSR value depends on
1)SDCCH Assignment success Rate
2)SDCCH Drop Rate
3) TCH Assignment Success Rate
4)All

A

All
CSSR (Call Setup Success Rate)

39
Q

Call drops are identified through _____ messages.
1) RACH
2) SACCH
3) TCH

A

SACCH messages

40
Q

Calll drop rate should be ≤ _%
1) 1%
2) 2%
3) 3%
4) 5%

A

2%

41
Q

If _________ is used in MSC then lower priority MS will face call drop.
1) pre-emption
2) post-emption

A

pre-emption

42
Q

The overall handover process is implemented in the
1) MS
2) BSS
3) MSC
4) All

A

All

43
Q

Paging Channel Congestion should be ≤ ____%.
1) 1%
2) 2%
3) 3%
4) 5%

A

1%

44
Q

page response is sent to network through _____
1) TCH
2) BCH
3) SDCCH
4) RACH

A

SDCCH

45
Q

_____is used by the MS on the “uplink” to request for allocation of an SDCCH
1) TCH
2) BCH
3) RACH

A

RACH: Random Access Channel

46
Q

RACH _______ (dbm) is an especially important parameter for low coverage rural areas
1) Min.PowerLevel
2) Max.PowerLevel
3) Min.Access Level
4) Max.Access Level

A

RACH Min.Access Level (dbm)

47
Q

RACH success rate depends on
1) BTS sensitivity
2) Uplink Interference and quality
3) UL-DL imbalance
4) All

A

All
RACH: Random Access Channel

48
Q

___________ is a physical connection used by the two Radio Resource entities to support the unidirectional transfer of PDUs on packet data physical channels.
1) Block Flow
2) Temporary Block Flow
3) Trasnsport Block Flow

A

Temporary Block Flow (TBF)

49
Q

TBF Success Rate is when during a data session, TBFs are successfully established on _____.
1) Uplink
2) Downlink
3) Both

A

Both UL and DL
TBF: Temporary Block Flow

50
Q

TBF stands for

A

Temporary Block Flow

51
Q

4G Accessibility and Retainability measurements are performed through _________ service
1) E-UTRAN’s E-TBF service
2) E-UTRAN’s E-RAB service
3) E-UTRAN’s E-RRH service
4) E-UTRAN’s E-BBU service

A

E-UTRAN’s E-RAB service

52
Q

________ measures how many times a service was interrupted or dropped during use
1) Accessibility
2) Retainability
3) Integrity
4) Availability

A

Retainability

53
Q

_________ measurement is performed through E-UTRAN’s delivery of IP packets
1) Accessibility
2) Retainability
3) Integrity
4) Availability

A

Integrity

54
Q

The measurement is performed in the E-UTRAN and will include Intra E-UTRAN and Inter RAT handovers
1) Accessibility
2) Retainability
3) Mobility
4) Availability
5) Integrity

A

Mobility

55
Q

refers to the quality of being available when users needed. eg. user request to access the network, access the voice call
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Accessibility KPI

56
Q

used to measure properly of whether services requested by users can be accessed in given condition
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Accessibility KPI

57
Q

used to measure how the network keep user’s possession or
able to hold and provide the services for the users
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Retainability KPI

58
Q

used to measure the performance of network which can handle the movement of users and still retain the service for the user, such as handover
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Mobility KPI

59
Q

used to measure the character or honesty of network to its user, such as what is the throughput, latency which users were served
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Integrity KPI

60
Q

used to measure how the network keep user’s possession or able to hold and provide the services for the users
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Availability KPI

61
Q

used to measure the utilization of network, whether the network capacity is reached its resource
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Utilization KPI

62
Q

These indicators denote
● RRC setup success rate
● ERAB setup success rate
● Call Setup Success Rate
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Accessibility KPI

63
Q

These indicators denote
● Call drop rate
● Service Call drop rate
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Retainability KPI

64
Q

These indicators denote
● Intra-Frequency Handover Out Success Rate
● Inter-Frequency Handover Out Success Rate
● Inter-RAT Handover Out Success Rate (LTE to WCDMA)
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Mobility KPI

65
Q

These indicators denote
● E-UTRAN IP Throughput
● IP Throughput in DL
● E-UTRAN IP Latency
1) Accessibility KPI
2) Retainability KPI
3) Mobility KPI
4) Availability KPI
5) Integrity KPI
6) Utilization KPI

A

Integrity KPI

66
Q

TCBH, CBBH stands for (related to busy hour)

A

Time consistent Busy Hour
Cell Bouncing Busy Hour

67
Q

Time Consistent Busy Hour shall be established on the basis of analysis of traffic data for a period of
____ days;
1) 30
2) 60
3) 90
4) 120

A

90 (ninety days)

68
Q

One hour period starting at the same time each day for which the average traffic of the resource group concerned is greatest over the days under consideration
1) Time consistent Busy Hour
2) Cell Bouncing Busy Hour

A

Time consistent Busy hour

69
Q

one hour period in a day during which a cell in cellular mobile telephone network experiences the
maximum traffic
1) Time consistent Busy Hour
2) Cell Bouncing Busy Hour

A

Cell Bouncing Busy Hour

70
Q

Backhaul links using the V-band or the E-band are well suited to supporting ___
1) 2G
2) 3G
3) 4G
4) 5G

A

5G due to their 10 Gbps to 25 Gbps data throughput capabilities

71
Q

Microwave backhaul solutions in the 7 GHz to 40
GHz bands, in addition to higher microwave bands such as V-band (60 GHz) and the E-band (70/80 GHz) can be relied

A

True

LDCE Wireless (15 decks)

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