Backhaul Media & KPI Flashcards
a transport network that connects the macro cell to the small cells
1) fronthaul
2) backhaul
fronthaul
_____ became a necessary addition when a new link connected centralized BBU to individual RRH
1) fronthaul
2) backhaul
fronthaul
Front haul is connection in RAN infrastructure between the ___ and ____
1) BSC and BTS
2) BBU and RRH
Baseband Unit (BBU) and Remote Radio Head (RRH)
BBU and RRH stand for
Baseband Unit (BBU) and Remote Radio Head (RRH)
Backhaul links using the V-band or the E-band are well suited to supporting ____
1) 3G
2) 4G
3) 5G
suited to supporting 5G due to their 10 Gbps to 25 Gbps data throughput capabilities
Microwave can be used in ____ mode
a) LOS
b) NLOS
c) either a or b
d) none
either a or b
Microwave can be used in
a) chain
2) mesh
3) ring
4) all the above
all the above
____ provides a level of tolerance to multi-path fading not possible with LOS
1) QPSK
2) QAM
3) OFDM
4) TDM
OFDM
partitioning of physical network infrastructure into logical networks is
1) network slicing
2) multiplexing
network slicing
Architectures for mobile backhaul optimization
1) MEC (Multi-access edge computing)
2) Cloud RAN
3) both
4) none
both
heterogeneous networks with many
small cells would benefit from this architecture.
1) MEC (Multi-access edge computing)
2) Cloud RAN
3) both
4) none
Cloud RAN
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
Cloud RAN
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
low-level split
low-level split ______ (increases/decreases) fronthaul cost with _____ (higher/lower) complexity at cell site.
increases fronthaul cost
lower complexity at cell site
high-level split ______ (increases/decreases) fronthaul cost with _____ (higher/lower) complexity at cell site.
decreases fronthaul cost
higher complexity at cell site
_____ is used to extend the coverage of a BTS/NodeB/eNodeB like rural areas or tunnels
1) RAN
2) RRH
3) BBU
Remote Radio Head (RRH)
RRH is generally connected to the BTS/NodeB/eNodeB via a fibre optic cable using ___________ protocols
1) HDLS
2) CPRI
3) SSL
Common Public Radio Interface (CPRI)
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
all the above
RRHs will use the latest RF component technology including _________ RF power devices
1) Gallium nitride (GaN)
2) GaAs
Gallium nitride (GaN)
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
4) all the above
_____ 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
Key Performance Indicators (KPI) also called “Key Success Indicators
(KSI)”
The KPIs are available in report form through _______
1) BTS
2) BSC
3) OMC
OMC
RF Optimizer makes frequent use of statistical data for routine optimization activities
T
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
All the above
SMS is also sent/delivered through ______ channel
in idle mode
1) TCH
2) BCCH
3) SDCCH
SDCCH
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
All the above
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
All the above
congestion due to too much SMS traffic can be solved by
1) Implement dynamic SDCCH allocation mode
2) Increase SDCCH channels
3) both
both
Adjusting _____reduces frequent location update at LAC boundaries
1) Power level
2) Range
3) CRH
CRH (Cell Reselection Hysteresis)
The Main Reasons for High SDCCH Drop Rate are
1) improper Parameters Configuration
2) Bad RF & Environmental factors
3) both
both
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
all the above
SDCCH congestion rate day average value should be ≤ _%
1) 1%
2) 2%
3) 3%
4) 5%
1%
TCH congestion rate day average value should be ≤ _%
1) 1%
2) 2%
3) 3%
4) 5%
2%
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
both
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
Erlang-B table
_________ indicates the probability of successful calls initiated by MS
1) RLT
2) CSSR
3) FER
4) HOSR
CSSR (Call Setup Success Rate)
CSSR rate day average value should be __
1) >=90%
2) >=95%
3) >=99%
> =95%
CSSR (Call Setup Success Rate)
CSSR value depends on
1)SDCCH Assignment success Rate
2)SDCCH Drop Rate
3) TCH Assignment Success Rate
4)All
All
CSSR (Call Setup Success Rate)
Call drops are identified through _____ messages.
1) RACH
2) SACCH
3) TCH
SACCH messages
Calll drop rate should be ≤ _%
1) 1%
2) 2%
3) 3%
4) 5%
2%
If _________ is used in MSC then lower priority MS will face call drop.
1) pre-emption
2) post-emption
pre-emption
The overall handover process is implemented in the
1) MS
2) BSS
3) MSC
4) All
All
Paging Channel Congestion should be ≤ ____%.
1) 1%
2) 2%
3) 3%
4) 5%
1%
page response is sent to network through _____
1) TCH
2) BCH
3) SDCCH
4) RACH
SDCCH
_____is used by the MS on the “uplink” to request for allocation of an SDCCH
1) TCH
2) BCH
3) RACH
RACH: Random Access Channel
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
RACH Min.Access Level (dbm)
RACH success rate depends on
1) BTS sensitivity
2) Uplink Interference and quality
3) UL-DL imbalance
4) All
All
RACH: Random Access Channel
___________ 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
Temporary Block Flow (TBF)
TBF Success Rate is when during a data session, TBFs are successfully established on _____.
1) Uplink
2) Downlink
3) Both
Both UL and DL
TBF: Temporary Block Flow
TBF stands for
Temporary Block Flow
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
E-UTRAN’s E-RAB service
________ measures how many times a service was interrupted or dropped during use
1) Accessibility
2) Retainability
3) Integrity
4) Availability
Retainability
_________ measurement is performed through E-UTRAN’s delivery of IP packets
1) Accessibility
2) Retainability
3) Integrity
4) Availability
Integrity
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
Mobility
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
Accessibility KPI
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
Accessibility KPI
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
Retainability KPI
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
Mobility KPI
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
Integrity KPI
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
Availability KPI
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
Utilization KPI
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
Accessibility KPI
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
Retainability KPI
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
Mobility KPI
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
Integrity KPI
TCBH, CBBH stands for (related to busy hour)
Time consistent Busy Hour
Cell Bouncing Busy Hour
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
90 (ninety days)
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
Time consistent Busy hour
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
Cell Bouncing Busy Hour
Backhaul links using the V-band or the E-band are well suited to supporting ___
1) 2G
2) 3G
3) 4G
4) 5G
5G due to their 10 Gbps to 25 Gbps data throughput capabilities
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
True
