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試験準備には最適なH35-580_V2.0試験問題2024年最新のHCIA-5G究極な62問があります
質問 # 24
The UPEU in the BBU5900 needs to be connected to two circuit breakers.
- A. True
- B. False
正解：B
解説：
Explanation
According to the BBU Quick Installation Guide (V100R005C10_04) (PDF)-EN, the UPEU in the BBU5900 needs to be connected to only one circuit breaker, not two. The UPEU is a universal power and environment interface unit that provides power supply and environment monitoring functions for other boards in a subrack.
The UPEU converts -48 V DC to +12 V DC and distributes the power to other boards. The UPEU also collects alarms from the subrack and reports them to the main processing board. The UPEU can be installed in slot 0 or slot 10 of the BBU5900 subrack. The UPEU needs to be connected to a -48 V DC power cable that is connected to a circuit breaker in the cabinet. The circuit breaker must have a rated current of 16 A or higher.
Therefore, the correct answer is B.
質問 # 25
In NSA networking, which of the following methods can be used to support X2 interconnection between an eNodeB and a gNodeB?(Select All that Apply)
- A. Interconnection via backplane in a subrack
- B. IPRAN interconnection between subracks
- C. Interconnection through HEI interfaces on the UBBP boards in different subracks
- D. Interconnection through CI interfaces on the UMPT boards in different subracks
正解：B、D
解説：
Explanation
According to the 5G EN-DC Architecture and Interfaces, there are two methods that can be used to support X2 interconnection between an eNodeB and a gNodeB in NSA networking:
Interconnection through CI interfaces on the UMPT boards in different subracks: The UMPT is a universal main processing and transmission unit that provides main processing and transmission functions for a subrack. The UMPT has two CI interfaces that can be used for X2 interconnection with other base stations. The CI interfaces support CPRI, OBSAI, and eCPRI protocols and can use optical fibers or electrical cables for transmission. The CI interfaces can be configured as master or slave interfaces depending on the network topology.
IPRAN interconnection between subracks: IPRAN is an IP-based radio access network that uses IP transport technologies to carry base station traffic over Ethernet or MPLS networks. IPRAN can support X2 interconnection betweendifferent base stations by using IP routers or switches. IPRAN can provide flexible networking, high bandwidth, low latency, and high reliability for X2 interconnection.
The other two methods are not valid for X2 interconnection between an eNodeB and a gNodeB:
Interconnection via backplane in a subrack: This method is only applicable for X2 interconnection between two eNodeBs or two gNodeBs that are installed in the same subrack. The backplane is the internal bus that connects different boards within a subrack. The backplane supports CPRI, OBSAI, and eCPRI protocols and can provide high-speed data transmission between boards.
Interconnection through HEI interfaces on the UBBP boards in different subracks: This method is not supported by Huawei base stations. The HEI interface is a high-speed Ethernet interface that is used for data transmission between base stations and core networks or transport networks. The HEI interface supports S1, Xn, F1, E1, and N2 protocols and can use optical fibers or electrical cables for transmission. The HEI interface cannot be used for X2 interconnection between base stations.
Therefore, the correct answer is A and D.
質問 # 26
Handover execution failures can use the counters to collect failure reasons in SA networking.
- A. False
- B. True
正解：B
解説：
Explanation
According to the HCIA-5G V2.0 Exam Outline, handover execution failures can use the counters to collect failure reasons in SA networking, which corresponds to option A. The counters include
N.HO.Exec.Fail.RadioResFail, N.HO.Exec.Fail.TAExceed, N.HO.Exec.Fail.NoRespFromUE, and
N.HO.Exec.Fail.Other.
質問 # 27
Which of the following events is used by the gNodeB to trigger a blind redirection procedure?
- A. A3
- B. A1
- C. A4
- D. A2
正解：A
解説：
Explanation
According to the Blind handover or blind redirection method and system, A3 is the event that is used by the gNodeB to trigger a blind redirection procedure. A3 is defined as "neighbour becomes offset better than serving" in 3GPP TS 38.331. When the gNodeB detects that the UE's signal quality on a neighbouring cell is better than that on the serving cell by a certain offset, it can initiate a blind redirection procedure to switch the UE to the neighbouring cell without requiring measurement reports from the UE.
質問 # 28
Which of the following AAUs support vertical beamforming?(Select All that Apply)
- A. 8T8R
- B. 4T4R
- C. 64T64R
- D. 32T32R
正解：C、D
解説：
Explanation
According to the 5G Beamforming: An Engineer's Overview, 32T32R and 64T64R AAUs support vertical beamforming. AAU stands for Active Antenna Unit, which is a type of antenna that integrates RF and antenna functions in one unit. Vertical beamforming is a technique that uses multiple antenna elements in a vertical array to form beams in different elevation angles. 32T32R and 64T64R AAUs have enough antenna elements to support vertical beamforming, while 8T8R and 4T4R AAUs do not have enough antenna elements to support vertical beamforming effectively.
質問 # 29
How many RBs are included when a bandwidth of 100 MHz and a subcarrier spacing of 60 kHz are used in a
5G cell?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
Explanation
To find the number of RBs in a 5G cell, we need to know the bandwidth and the subcarrier spacing of the cell.
The bandwidth is the total frequency range allocated for the cell, while the subcarrier spacing is the frequency separation between adjacent subcarriers in the cell. A RB is a group of 12 consecutive subcarriers in the frequency domain 12. Therefore, the number of RBs in a 5G cell can be calculated by dividing the bandwidth by the product of the subcarrier spacing and 12.
Given that the bandwidth is 100 MHz and the subcarrier spacing is 60 kHz, we can use the following formula to find the number of RBs:
Number of RBs = Bandwidth / (Subcarrier spacing * 12) Number of RBs = 100 MHz / (60 kHz * 12) Number of RBs = 100000 kHz / 720 kHz Number of RBs = 138.888...
However, since the number of RBs must be an integer, we need to round it down to the nearest multiple of
3 3. This is because the NR standard defines different frequency ranges for different subcarrier spacings, and each frequency range has a minimum and maximum number of RBs that are multiples of 3 4. For example, for subcarrier spacing of 60 kHz, the frequency range is from 24250.08 MHz to 52600.08 MHz, and the minimum and maximum number of RBs are 66 and 273, respectively.
Therefore, the closest multiple of 3 to 138.888... is 135. However, this number is not valid because it is lower than the minimum number of RBs for subcarrier spacing of 60 kHz. The next valid multiple of 3 is 273, which is also the maximum number of RBs for subcarrier spacing of 60 kHz. Therefore, the correct answer is C. 273.
質問 # 30
In SA networking, which of the following is the first step for a UE to perform a cell search?
- A. Synchronize frames and obtain PCI group number.
- B. Synchronize half-frames and obtain the ID within a PCI group.
- C. Obtain the cell signal quality.
- D. Obtain other cell information.
正解：A
解説：
Explanation
According to the 5G SA Cell Search & Network Entry Matrix, the first step for a UE to perform a cell search in SA networking is to synchronize frames and obtain PCI group number. This step involves the following sub-steps:
The UE scans the available frequency range to detect the presence of Synchronization Signal Blocks (SSBs) from different base stations. SSBs are periodic signals that contain essential synchronization and system information for cell search and initial access.
The UE selects an SSB with the strongest signal strength and decodes its Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS). The PSS and SSS are part of the SSB and provide coarse timing synchronization and cell identity information.
The UE uses the PSS and SSS information to synchronize its internal clock with that of the base station and obtain the Physical Cell Identity (PCI) group number. The PCI group number is a 9-bit value that identifies a group of 8 cells that share the same PSS and SSS sequences. The PCI group number ranges from 0 to 1007.
The other steps for a UE to perform a cell search in SA networking are:
Synchronize half-frames and obtain the ID within a PCI group: The UE further synchronizes its timing with the base station by decoding its Narrowband Synchronization Signal (NSSS), which is also part of the SSB. The NSSS provides more precise timing information and the ID within a PCI group, which is a
3-bit value that identifies a specific cell within a PCI group. The ID within a PCI group ranges from 0 to
7. By combining the PCI group number and the ID within a PCI group, the UE can obtain the full PCI, which is a 10-bit value that uniquely identifies a cell.
Obtain other cell information: The UE decodes other signals and channels in the SSB to acquire other cell information, such as system bandwidth, subcarrier spacing, frame structure, etc. These signals and channels include Demodulation Reference Signals (DMRS), Master Information Block (MIB), System Information Block (SIB), etc.
Obtain the cell signal quality: The UE measures the cell signal quality based on various indicators, such as Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), etc. These indicators reflect the strength, quality, and interference level of the received signal.
質問 # 31
In which of the following areas is overlapping coverage unlikely to occur?
- A. Around areas with water
- B. Crossroads in dense urban areas
- C. High-rise buildings
- D. Inside a tunnel
正解：A
解説：
Explanation
According to the HCIA-5G - Huawei Enterprise Support Community, overlapping coverage is likely to occur in areas such as inside a tunnel, crossroads in dense urban areas, and high-rise buildings, which correspond to options A, B, and C. These areas have complex propagation environments and multiple paths for signals to reach the UE. Around areas with water, overlapping coverage is unlikely to occur because water can reflect signals and reduce interference from other cells, which corresponds to option D.
質問 # 32
Which of the following statements about throughput-related indicators are correct?(Select All that Apply)
- A. The actual cell throughput can be obtained by dividing the total data transmission throughput within a measurement period by the time when data is transmitted in the cell.
- B. The uplink/downlink average UE throughput is used to evaluate the user-perceived rate.
- C. Throughput is more accurate if the last small packet of each data transmission burst and its transmission duration are added.
- D. The average throughput of a single UE is obtained by dividing the data volume transmitted or received by the UE by the actual data transmission time.
正解：A、B、D
解説：
Explanation
According to the HCIA-5G V2.0 Exam Outline, the statements in options A, B, and C are correct descriptions of throughput-related indicators, which correspond to options A, B, and C. The statement in option D is incorrect because adding the last small packet of each data transmission burst and its transmission duration will reduce the accuracy of throughput measurement.
質問 # 33
What is the maximum bandwidth in mmWave bands as defined in 3GPP Release 16?
- A. 400MHz
- B. 60MHz
- C. 100MHz
- D. 20MHz
正解：A
解説：
Explanation
According to the 5G mmWave Frequency Bands, the maximum bandwidth in mmWave bands as defined in
3GPP Release 16 is 400MHz, which can be achieved without any carrier aggregation method.
質問 # 34
In an intra-frequency reselection procedure, which message contains the rangeToBestCell parameter?
- A. SIB3
- B. SIB1
- C. SIB4
- D. SIB2
正解：D
解説：
Explanation
According to the 38.331 RRC, SIB2 is the message that contains the rangeToBestCell parameter, which is used for intra-frequency cell reselection. The rangeToBestCell parameter defines a threshold for cell ranking based on RSRP (Reference Signal Received Power). A UE may only reselect to a cell if its RSRP exceeds that of the serving cell by at least rangeToBestCell dB.
質問 # 35
Which of the following NR system indicators is at the base station level?
- A. PRB usage
- B. User capacity usage
- C. Paging resource usage
- D. PDCCH resource usage
正解：B
解説：
Explanation
According to the HCIA-5G V2.0 Exam Outline, user capacity usage is an NR system indicator that is at the base station level, which corresponds to option C. It reflects the number of users that can be served by a base station. PRB usage, PDCCH resource usage, and paging resource usage are NR system indicators that are at the cell level, which correspond to options A, B, and D. They reflect the utilization of physical resources in a cell.
質問 # 36
Which of the following statements about downlink beamforming are correct?(Select All that Apply)
- A. Both broadcast channels and traffic channels support beamforming.
- B. Dynamic beams are used for traffic channels.
- C. Only the PDSCH supports beamforming.
- D. Static beams are used for broadcast channels.
正解：A、B、D
解説：
Explanation
According to the Beamforming techniques for massive MIMO systems in 5G, these statements are correct about downlink beamforming. Beamforming is a technique that uses multiple antennas to steer the transmitted signal toward the intended user or direction. Static beams are used for broadcast channels, such as MIB and SIB, which are transmitted to all UEs in a cell. Dynamic beams are used for traffic channels, such as PDSCH and PDCCH, which are transmitted to specific UEs based on their channel conditions and locations. Both broadcast channels and traffic channels support beamforming, but with different beamforming methods and performance requirements.
質問 # 37
Which of the following logical channels can be mapped to different transport channels?
- A. DCCH
- B. PCCH
- C. CCCH
- D. BCCH
正解：A、B、C
解説：
Explanation
According to the 5G NR Channels, the following logical channels can be mapped to different transport channels in the downlink and/or uplink:
Common Control Channel (CCCH): It can be mapped to Downlink Shared Channel (DL-SCH) or Uplink Shared Channel (UL-SCH).
Dedicated Control Channel (DCCH): It can be mapped to DL-SCH or UL-SCH.
Paging Control Channel (PCCH): It can be mapped to Paging Channel (PCH) or DL-SCH.
Broadcast Control Channel (BCCH): It can be mapped to Broadcast Channel (BCH) or DL-SCH.
質問 # 38
Which of the following channels/signals is used by the UE to measure and obtain the CQI?
- A. PDCCH
- B. PDSCH
- C. CSI-RS
- D. OSSB
正解：C
解説：
Explanation
According to the 5G NR Downlink CSI Reporting, CSI-RS is the channel/signal that is used by the UE to measure and obtain the CQI. CSI-RS stands for Channel State Information Reference Signal, which is a downlink reference signal transmitted by the gNodeB to enable the UE to estimate the channel quality and feedback the CQI to the gNodeB. The CQI is an indicator of how good or bad the channel quality is, and it can be used by the gNodeB to adjust the modulation and coding scheme for data transmission.
質問 # 39
On a 5G network, the NAS layer uses 5G-GUTI to replace IMSI as the temporary ID of a UE for security reasons.
- A. False
- B. True
正解：B
解説：
Explanation
According to the 5G-GUTI - 5G Globally Unique Temporary Identity, the NAS layer uses 5G-GUTI to replace IMSI as the temporary ID of a UE for security reasons. The 5G-GUTI is allocated by the AMF (Core Access and Mobility Management Function) at the time of network registration, and it is composed of the GUAMI (Globally Unique AMF ID) and the 5G-TMSI (5G Temporary Mobile Subscriber Identity).
質問 # 40
Which of the following common messages need to be scheduled?(Select All that Apply)
- A. RA Response
- B. SIB
- C. MIB
- D. Paging
正解：B、C、D
解説：
Explanation
According to the 5G NR Physical Layer Specifications, Paging, SIB, and MIB are common messages that need to be scheduled. Paging is a message that is used to notify a UE of incoming data or system information when it is in idle mode or connected mode inactive state. SIB stands for System Information Block, which is a message that contains various system parameters and configuration information for UEs. MIB stands for Master Information Block, which is a message that contains essential system information such as system frame number and subcarrier spacing. These common messages need to be scheduled because they are transmitted periodically and have fixed time-frequency resources.
質問 # 41
In SA networking, which of the following messages is used to deliver PRACH power control parameters to UEs?
- A. SIB1
- B. RRC reconfiguration
- C. SIB2
- D. MIB
正解：C
解説：
Explanation
According to the 5G NR Uplink Power Control Procedure, SIB2 is the message that contains the PRACH power control parameters, such as msg3-Alpha, p0-NominalWithoutGrant, and p0-AlphaSets. These parameters are used by the UE to determine the transmit power of the PRACH preamble.
質問 # 42
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