Radio Frequency Training Test! Trivia Quiz
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Questions and Answers
- 1.
In SAE , which equipment is used to process the control plane of the S1 interface?
- A.
MME
- B.
SGW
- C.
PDN GATEWAY
- D.
PCRF
Correct Answer
A. MMEExplanation
The MME (Mobility Management Entity) is responsible for processing the control plane of the S1 interface in SAE (System Architecture Evolution). It handles tasks such as authentication, mobility management, and session management for mobile devices. Therefore, the MME is the equipment used to process the control plane of the S1 interface.Rate this question:
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- 2.
How many symbols in each time slot for extended CP?
- A.
5
- B.
6
- C.
7
- D.
8
Correct Answer
B. 6Explanation
For extended CP (Cyclic Prefix), there are 6 symbols in each time slot. The extended CP is used in wireless communication systems to mitigate the effects of multipath fading. It adds extra guard symbols at the beginning of each time slot, which helps in reducing inter-symbol interference caused by reflections of the transmitted signal. By having 6 symbols in each time slot for extended CP, the system can ensure better signal reception and improve overall communication performance.Rate this question:
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- 3.
Maximally how many symbols could be used for PDCCH in a sub frame？
- A.
1
- B.
3
- C.
5
- D.
7
Correct Answer
B. 3Explanation
In a subframe, the Physical Downlink Control Channel (PDCCH) is used to carry control information for resource allocation and scheduling. The maximum number of symbols that can be used for PDCCH in a subframe is 3. This means that out of the total number of symbols in a subframe, a maximum of 3 symbols can be allocated for PDCCH transmission.Rate this question:
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- 4.
Which of the following system information are not carried by PDSCH?
- A.
MIB
- B.
SIB1
- C.
SIB2
- D.
SIB3
Correct Answer
A. MIBExplanation
PDSCH (Physical Downlink Shared Channel) is a channel used for transmitting user data in LTE networks. It does not carry the MIB (Master Information Block), which is a broadcast message containing essential system information like the cell identity, system bandwidth, and frame structure. Instead, the MIB is transmitted on the PBCH (Physical Broadcast Channel). Therefore, the correct answer is MIB.Rate this question:
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- 5.
Which of the following channels is used to indicate on the numbers of OFDMA symbols reserved for control information?
- A.
PDSCH
- B.
PBCH
- C.
PCFICH
- D.
PHICH
Correct Answer
C. PCFICHExplanation
PCFICH (Physical Control Format Indicator Channel) is used to indicate the number of OFDMA symbols reserved for control information. This channel is responsible for informing the receiving device about the presence and location of control information within the OFDMA symbols. It is an essential channel in the LTE (Long-Term Evolution) system as it helps in efficient and accurate decoding of control information, allowing for proper communication and coordination between the base station and user equipment.Rate this question:
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- 6.
Which measurement quantity is used for UE idle measurement?
- A.
RSRP
- B.
RSRQ
- C.
SINR
- D.
Both RSRP and RSRQ
Correct Answer
D. Both RSRP and RSRQExplanation
Both RSRP (Reference Signal Received Power) and RSRQ (Reference Signal Received Quality) are measurement quantities used for UE (User Equipment) idle measurement. RSRP measures the power level of the received reference signal, while RSRQ measures the quality of the received reference signal, taking into account the power level and interference. Both RSRP and RSRQ are important metrics for evaluating the signal strength and quality in idle mode, helping to determine the signal coverage and potential for successful communication between the UE and the network.Rate this question:
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- 7.
Which of following procedure is not UE idle behavior?
- A.
System message reception
- B.
Paging reception
- C.
RS measurement
- D.
Measurement report
Correct Answer
D. Measurement reportExplanation
The measurement report is not considered UE idle behavior. UE idle behavior refers to the actions that a user equipment (UE) takes when it is not actively engaged in a communication session. System message reception, paging reception, and RS measurement are all examples of UE idle behavior as they involve the UE monitoring the network for any incoming messages or signals. However, a measurement report is typically generated by the UE when it is actively connected to the network and providing information about the quality of the signal or the surrounding environment. Therefore, it is not considered a part of UE idle behavior.Rate this question:
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- 8.
What is the period of system message update?
- A.
1 hour
- B.
2 hours
- C.
3 hours
- D.
4 hours
Correct Answer
C. 3 hoursExplanation
The period of system message update is 3 hours. This means that the system messages are updated every 3 hours.Rate this question:
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- 9.
What is the possible scenario to trigger cell selection?
- A.
After UE handovers in a new cell
- B.
After UE selects a new PLMN
- C.
After UE establishes RRC connection
- D.
After UE establishes RRC reconfiguration
Correct Answer
B. After UE selects a new PLMNExplanation
After UE selects a new PLMN, it is possible for cell selection to be triggered. This is because when the UE selects a new PLMN, it needs to search for and connect to a suitable cell within that PLMN. Cell selection is the process by which the UE scans and evaluates the available cells in order to determine the best cell to connect to. Therefore, selecting a new PLMN can trigger cell selection as the UE searches for a suitable cell within the chosen PLMN.Rate this question:
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- 10.
What modulation does LTE support for PBCH？
- A.
BPSK
- B.
QPSK
- C.
16QAM
- D.
64QAM
Correct Answer
B. QPSKExplanation
LTE supports QPSK modulation for PBCH (Physical Broadcast Channel). QPSK stands for Quadrature Phase Shift Keying, which is a modulation scheme that uses four different phase shifts to represent digital data. QPSK allows for the transmission of two bits per symbol, making it more efficient than BPSK (Binary Phase Shift Keying). 16QAM and 64QAM are higher order modulation schemes that can transmit more bits per symbol, but they are not supported for PBCH in LTE. Therefore, the correct answer is QPSK.Rate this question:
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- 11.
Which of following parameters are not included in UE measurement report?
- A.
Measurement ID
- B.
Target cell PCI
- C.
Event ID
- D.
Measurement result
Correct Answer
C. Event IDExplanation
The UE measurement report includes parameters such as Measurement ID, Target cell PCI, and Measurement result. However, the Event ID is not included in the UE measurement report.Rate this question:
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- 12.
For Enhanced Blind Handover, which of the followings are incorrect?
- A.
In order to avoid the failures of blind handover
- B.
UE is configured with A1 to measure the service cell before handover
- C.
In the CSFB based on enhanced Blind Handover, UE is configured with B1 to measure the target system before handover
- D.
Option 4
Correct Answer
C. In the CSFB based on enhanced Blind Handover, UE is configured with B1 to measure the target system before handoverExplanation
In the CSFB based on enhanced Blind Handover, UE is not configured with B1 to measure the target system before handover. This statement is incorrect because in the CSFB procedure, the UE is actually configured with B2 to measure the target system before handover, not B1. B2 is used to measure the target system's signal quality and determine if it is suitable for handover.Rate this question:
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- 13.
What is maximum measurement result number that can be contained in one measurement report?
- A.
2
- B.
4
- C.
6
- D.
8
Correct Answer
D. 8Explanation
The maximum measurement result number that can be contained in one measurement report is 8. This means that the measurement report can include measurement results ranging from 1 to 8.Rate this question:
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- 14.
After detect abnormal handover between cell A and cell B, which parameter should be modify?
- A.
Ocn
- B.
Ocs
- C.
Ofn
- D.
Ofs
Correct Answer
A. OcnExplanation
After detecting an abnormal handover between cell A and cell B, the parameter that should be modified is Ocn.Rate this question:
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- 15.
Which of following is the Necessary Handover?
- A.
Coverage-based
- B.
Service-based
- C.
Frequency Priority-based
- D.
Speed-based
Correct Answer
A. Coverage-basedExplanation
A coverage-based handover is necessary when a mobile device moves out of the coverage area of one base station and needs to be handed over to another base station that can provide better coverage. This type of handover ensures that the connection is maintained and the user experiences uninterrupted service. It is essential in areas where the coverage of a single base station is limited, such as in rural or remote locations.Rate this question:
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- 16.
For measurement based CSFB, after which event does the eNodeB trigger CSFB execution?
- A.
A1
- B.
A3
- C.
B1
- D.
B2
Correct Answer
C. B1Explanation
For measurement based CSFB, the eNodeB triggers CSFB execution after the B1 event.Rate this question:
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- 17.
If target inter-RAT doesn't support VoIP service, what is the solution for LTE VoIP inter-RAT handover?
- A.
SRVCC
- B.
CSFB
- C.
PS handover
- D.
CCO
Correct Answer
A. SRVCCExplanation
The solution for LTE VoIP inter-RAT handover when the target inter-RAT doesn't support VoIP service is SRVCC (Single Radio Voice Call Continuity). SRVCC allows for the seamless handover of a VoIP call from LTE to a legacy circuit-switched network, such as GSM or UMTS, without interrupting the call. This ensures that the call remains connected and the user experiences a smooth transition between different network technologies.Rate this question:
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- 18.
Which of following technologies are not used only on uplink scheduling?
- A.
TTI bundling
- B.
64QAM
- C.
Pre-allocation scheduling
- D.
Virtual MIMO scheduling
Correct Answer
B. 64QAMExplanation
64QAM is a modulation scheme that is used to increase the data transmission rate in both the uplink and downlink directions. It is not specific to uplink scheduling only. Therefore, it is not a technology that is used only on uplink scheduling.Rate this question:
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- 19.
Which interface used for TAI and LAI mapping?
- A.
S3
- B.
SGs
- C.
S1
- D.
S8
Correct Answer
B. SGsExplanation
SGs stands for Serving Gateway, which is an interface used for TAI (Tracking Area Identity) and LAI (Location Area Identity) mapping in cellular networks. The Serving Gateway is responsible for routing data packets between the base station (eNodeB) and the core network. It handles mobility management functions such as tracking the location of a mobile device and mapping it to the appropriate tracking area or location area. Therefore, SGs is the correct answer for the interface used for TAI and LAI mapping.Rate this question:
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- 20.
Which solution required the RIM?
- A.
PS Redirection
- B.
PS Blind Redirection
- C.
Flash CSFB
- D.
PS Handover
Correct Answer
C. Flash CSFBExplanation
Flash CSFB (Circuit Switched Fallback) is a solution that is used in LTE networks when a device needs to make a voice call but there is no VoLTE (Voice over LTE) coverage available. In this case, the device falls back to the legacy circuit-switched network (2G or 3G) to establish the voice call. The RIM (Radio Interface Module) is required in the Flash CSFB solution to facilitate the handover from LTE to the circuit-switched network for voice calls. Therefore, the solution that requires the RIM is Flash CSFB.Rate this question:
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- 21.
Which PLMN will be selected by UE to attach to the network?
- A.
OPLMN
- B.
UPLMN
- C.
RPLMN
- D.
HPLMN
Correct Answer
C. RPLMNExplanation
The UE will select the RPLMN (Registered PLMN) to attach to the network. RPLMN refers to the home network or the network that the UE is currently registered with. When the UE is in its home network, it will prioritize connecting to the RPLMN for better network quality and services. If the RPLMN is not available, the UE will then search for other PLMNs such as OPLMN (Operator PLMN) or UPLMN (User Preferred PLMN) based on the network selection criteria. However, the RPLMN is the preferred choice for attachment to the network.Rate this question:
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- 22.
Which signalling message is Msg3?
- A.
RRC Connection Request
- B.
RRC Connection Setup
- C.
RRC Connection Setup Complete
- D.
RRC Connection Reconfiguration
Correct Answer
A. RRC Connection RequestExplanation
Msg3 refers to the RRC Connection Request signalling message.Rate this question:
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- 23.
Which channel is used to transmit SRB0?
- A.
CTCH
- B.
DTCH
- C.
DCCH
- D.
CCCH
Correct Answer
D. CCCH -
- 24.
What is the difference between UE Initial Attach Procedure and Service Request Procedure?
- A.
No RRC Connection Setup in Service Request Procedure
- B.
No UE Capabilities Enquiry and Info in Service Request Procedure
- C.
No S1AP Initial UE message in UE Initial Attach Procedure
- D.
No RRC Connection Reestablishment in UE Initial Attach Procedure
Correct Answer
B. No UE Capabilities Enquiry and Info in Service Request ProcedureExplanation
The difference between UE Initial Attach Procedure and Service Request Procedure is that the Service Request Procedure does not involve UE Capabilities Enquiry and Info. In the Service Request Procedure, there is no need to gather information about the capabilities of the UE. On the other hand, the UE Initial Attach Procedure includes the UE Capabilities Enquiry and Info, where the network requests and receives information about the capabilities of the UE.Rate this question:
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- 25.
Which type of Random Access will be used for Handover process?
- A.
Contention based
- B.
Contention free
- C.
Connection free
- D.
Connection based
Correct Answer
B. Contention freeExplanation
Contention free random access is used for the handover process. In contention free random access, the resources are allocated in advance, ensuring that there is no contention or competition for the resources. This type of random access is suitable for the handover process as it guarantees a seamless and uninterrupted transfer of the ongoing call or data session from one base station to another without any interference or conflicts.Rate this question:
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- 26.
Preamble format 0 will be applied for large cell coverage
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement suggests that "Preamble format 0 will be applied for large cell coverage." However, the correct answer is False. This means that the statement is incorrect, and Preamble format 0 will not be applied for large cell coverage.Rate this question:
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- 27.
If no TMA in eNodeb, attenuation should be set as 11 dB.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
If there is no TMA (Tower Mounted Amplifier) in the eNodeB, the attenuation should not be set as 11 dB. The correct answer is False.Rate this question:
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- 28.
VSWR value can be checked by using STR VSWRTEST command but this command will interrupt service.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the VSWR value can indeed be checked using the STR VSWRTEST command. However, it is mentioned that this command will interrupt the service, implying that using this command will temporarily disrupt the normal operation of the system. Therefore, it is important to consider the potential impact on service before using the STR VSWRTEST command.Rate this question:
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- 29.
After VSWR value is higher than VSWR post-processing threshold, eNodeB will shutdown Tx port and Tx port will be automatically turned on after VSWR value back to normal.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement given in the answer is incorrect. After the VSWR value is higher than the VSWR post-processing threshold, the eNodeB will not shutdown the Tx port. Instead, it will initiate corrective measures to reduce the VSWR value, such as adjusting the antenna system or power levels. The Tx port will not be automatically turned on after the VSWR value returns to normal, as it was never shut down in the first place.Rate this question:
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- 30.
PIM 3 causes highest interference to the wanted signal.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
PIM (Passive Intermodulation) is a phenomenon that occurs when two or more signals mix together and create additional unwanted signals. PIM 3 refers to the third-order intermodulation product, which is the most significant and highest in magnitude compared to other intermodulation products. Therefore, it causes the highest interference to the wanted signal, making the statement true.Rate this question:
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- 31.
1 CCE consists of 40 Resource Elements.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because CCE (Control Channel Element) is a resource used in LTE (Long-Term Evolution) networks for transmitting control information. It is a part of the physical layer and is composed of 40 Resource Elements (REs). These REs are used to carry control signals and messages between the base station and the user equipment. Therefore, the given statement is correct.Rate this question:
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- 32.
Which parameter in Event A3 is used to prevent Ping-Pong handover
- A.
Ocn
- B.
Ofn
- C.
Ofs and Ocs
- D.
Hysteresis
Correct Answer
D. HysteresisExplanation
Hysteresis is the parameter in Event A3 that is used to prevent Ping-Pong handover. Hysteresis is a technique used in cellular networks to avoid frequent handovers between adjacent cells. It introduces a small delay in the handover decision, allowing the mobile device to stay connected to the current cell even if the signal strength of the target cell momentarily exceeds the serving cell. This prevents unnecessary handovers and improves the overall network performance and user experience.Rate this question:
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- 33.
What is the impact for handover when setting large value of Ofn?
- A.
If this parameter is set to a larger value, there is a higher probability of handing over UEs to cells on the neighboring E-UTRAN frequency, but these UEs may fail to access the target cells because of poor signal quality in the target cells
- B.
If this parameter is set to a larger value, there is a lower probability of handing over UEs to cells on the neighboring E-UTRAN frequency, but these UEs may fail to access the target cells because of poor signal quality in the target cells
- C.
If this parameter is set to a larger value, there is a lower probability of handing over UEs to cells on the neighboring E-UTRAN frequency, but these UEs may success to access the target cells because of poor signal quality in the target cells
- D.
If this parameter is set to a larger value, there is a higher probability of handing over UEs to cells on the neighboring E-UTRAN frequency, but these UEs may success to access the target cells because of poor signal quality in the target cells
Correct Answer
A. If this parameter is set to a larger value, there is a higher probability of handing over UEs to cells on the neighboring E-UTRAN frequency, but these UEs may fail to access the target cells because of poor signal quality in the target cellsExplanation
When the parameter Ofn is set to a larger value, there is a higher probability of handing over UEs to cells on the neighboring E-UTRAN frequency. However, these UEs may fail to access the target cells due to poor signal quality in the target cells. In other words, increasing the value of Ofn increases the likelihood of handover to neighboring cells, but it also increases the risk of unsuccessful handover due to signal quality issues in the target cells.Rate this question:
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- 34.
What is the meaning of Ocs
- A.
It does not take any effect in handover.
- B.
It affects the probability of triggering handovers from the neighboring cell to serving cell
- C.
It affects the probability of triggering handovers when setting this parameter to 0
- D.
It affects the probability of triggering handovers from the serving cell to its neighboring cells.
Correct Answer
D. It affects the probability of triggering handovers from the serving cell to its neighboring cells.Explanation
The correct answer is "It affects the probability of triggering handovers from the serving cell to its neighboring cells." This means that the Ocs parameter has an impact on the likelihood of initiating handovers from the current serving cell to the neighboring cells.Rate this question:
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- 35.
To check cross feeder or cross antenna, query command MOD TXBRANCH
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is false. The correct query command to check cross feeder or cross antenna is not "MOD TXBRANCH". Therefore, the explanation for the correct answer is that the statement provided is incorrect.Rate this question:
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- 36.
High Modulation scheme will be applied when LTE network has good channel quality
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In LTE networks, modulation scheme refers to the method of encoding data onto the radio waves. A high modulation scheme means that more data can be transmitted in a given time period, resulting in higher data rates. Good channel quality means that the radio waves are able to travel without significant interference or degradation. When the channel quality is good, the LTE network can support higher modulation schemes to achieve higher data rates. Therefore, it is true that a high modulation scheme will be applied when the LTE network has good channel quality.Rate this question:
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- 37.
RANK0 for 2*2 MIMO means 1 of 2 antennas is used to transmit data.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because in a 2*2 MIMO system, there are two antennas available for transmission. However, only one of the antennas is used at a time to transmit data. This means that the system switches between the two antennas to transmit data, enhancing the overall performance and reliability of the wireless communication.Rate this question:
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- 38.
Spatial Multiplexing can gain more reliability and diversity can gain more data rates.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Spatial multiplexing is a technique used in wireless communication systems to transmit multiple data streams simultaneously over the same frequency band. It improves data rates by transmitting different parts of a data stream over multiple antennas. However, spatial multiplexing does not provide reliability or diversity. Reliability refers to the ability to maintain a stable and consistent connection, while diversity refers to the use of multiple paths to improve signal quality. Therefore, the statement that spatial multiplexing can gain more reliability and diversity is false.Rate this question:
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- 39.
RRC reconfiguration message is used for reestablishing connection after HO failure and RLF.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The RRC reconfiguration message is not used for reestablishing connection after handover (HO) failure and radio link failure (RLF). It is actually used to modify the configuration of the radio resource control (RRC) connection between the mobile device and the network. It can be used to add or remove radio bearers, change radio bearer parameters, or modify measurement configurations.Rate this question:
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- 40.
TTI bundling feature can increase probability to transmit data on PUSCH successfully.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The TTI (Transmission Time Interval) bundling feature is designed to increase the probability of successfully transmitting data on the Physical Uplink Shared Channel (PUSCH). By bundling multiple TTI intervals together, more data can be transmitted in a single transmission, reducing the chances of errors or interference. This feature improves the efficiency and reliability of data transmission on the PUSCH, making the statement true.Rate this question:
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