H35-580_V2.0問題集合格保証付きの合格できるH35-580_V2.0試験2023年更新
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質問 # 21
In the cell search process in 5G SA, a UE completes frame synchronization after reading the SS.
- A. False
- B. True
正解：A
解説：
Explanation
According to the 5G SA Cell Search & Network Entry Matrix, a UE completes frame synchronization after reading the MIB, not the SS. The SS (Synchronization Signal) is used for initial detection and coarse timing synchronization, but it does not provide enough information for frame synchronization. The MIB (Master Information Block) is part of the SSB (Synchronization Signal Block) and contains essential system information, such as system frame number and subcarrier spacing, which are needed for frame synchronization.
質問 # 22
Which of the following counters can be measured at the board level?
- A. Number of paging messages
- B. Transmission interface measurement
- C. CCE usage
- D. CPU usage
正解：B、D
解説：
Explanation
According to the Career Certification - Huawei Enterprise, CPU usage and transmission interface measurement are counters that can be measured at the board level, which correspond to options A and B. They reflect the performance and status of the boards in a base station. Number of paging messages and CCE usage are counters that can be measured at the cell level, which correspond to options C and D. They reflect the utilization of radio resources in a cell.
質問 # 23
After gNodeB hardware is installed and commissioned, which of the following functions needs to be tested and verified in single site verification?
- A. Interoperability capability
- B. Equipment functions and coverage capability
- C. Call drop capability
- D. SON capability
正解：B
解説：
Explanation
According to the Career Certification - Huawei Enterprise, single site verification is used to test and verify the equipment functions and coverage capability after gNodeB hardware is installed and commissioned, which corresponds to option C.
質問 # 24
Under the same gNodeB, an NR TDD cell supports the same maximum number of RRC_CONNECTED UEs as an NR FDD cell.
- A. False
- B. True
正解：A
解説：
Explanation
According to the Radio Resource Control, the maximum number of RRC_CONNECTED UEs depends on the number of available C-RNTIs (Cell Radio Network Temporary Identifiers) in a cell. The number of C-RNTIs is limited by the size of the RNTI field in the DCI (Downlink Control Information) format. For NR TDD cells, the RNTI field size is 16 bits, which allows up to 65,536 C-RNTIs. For NR FDD cells, the RNTI field size is
14 bits, which allows up to 16,384 C-RNTIs. Therefore, an NR TDD cell can support more RRC_CONNECTED UEs than an NR FDD cell under the same gNodeB.
質問 # 25
Which of the following NR system indicators is at the base station level?
- A. PDCCH resource usage
- B. PRB usage
- C. Paging resource usage
- D. User capacity usage
正解：D
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 # 26
Which of the following statements about the advantages of the Rayce ray tracing model are correct?(Select All that Apply)
- A. It offers higher level prediction accuracy.
- B. It offers more accurate modeling for massive MIMO.
- C. It offers more accurate path searching, reflection, and diffraction energy calculation for electromagnetic wave propagation.
- D. It is applicable only to C-band, and not mmWave.
正解：A、C
解説：
Explanation
The Rayce ray tracing model is a propagation model that computes propagation paths using 3-D environment geometry 3. It is based on the shooting and bouncing rays (SBR) method, which launches rays from the transmitter and traces their reflections and diffractions until they reach the receiver or are attenuated below a threshold 4. The Rayce ray tracing model offers more accurate path searching, reflection, and diffraction energy calculation for electromagnetic wave propagation than other models, such as empirical models or deterministic models 5. It also offers higher level prediction accuracy, especially for massive MIMO systems that use beamforming techniques 6. The Rayce ray tracing model is not applicable only to C-band, but also to mmWave and other frequency bands 7.
質問 # 27
Which of the following problems may cause SCTP link disconnection over the N2 interface?(Select All that Apply)
- A. Routes are not configured.
- B. The SCTP port configuration is incorrect.
- C. PLMN configurations are incorrect.
- D. Physical ports are faulty.
正解：A、B、C、D
解説：
Explanation
According to the Troubleshooting Guide for Huawei 5G Base Stations, the possible causes of SCTP link disconnection over the N2 interface are as follows:
Routes are not configured: If the routes between the base station and the core network are not configured correctly, the SCTP link cannot be established or may be disconnected.
PLMN configurations are incorrect: If the PLMN configurations on the base station and the core network do not match, the SCTP link cannot be established or may be disconnected.
Physical ports are faulty: If the physical ports on the base station or the core network are faulty, such as damaged cables, loose connectors, or port errors, the SCTP link cannot be established or may be disconnected.
The SCTP port configuration is incorrect: If the SCTP port configuration on the base station or the core network is incorrect, such as using a reserved port number or a conflicting port number, the SCTP link cannot be established or may be disconnected.
質問 # 28
Which of the following is not a function of the 5G RRC layer?
- A. Radio resource management
- B. Encryption, decryption, and integrity protection
- C. Handover and mobility
- D. Access control
正解：B
解説：
Explanation
According to the HCIA-5G V2.0 Exam Outline, encryption, decryption, and integrity protection are functions of the PDCP layer, not the RRC layer. The RRC layer is responsible for radio resource management, access control, handover and mobility, among other functions.
質問 # 29
Which of the following is not the cause of cell unavailability due to system faults (specified using
N.Cell.Unavail.Dur.System)?
- A. Blocking cells by using MML commands
- B. Faults on an RF module's TX or RX channels
- C. CPRI link faults
- D. Board faults
正解：A
解説：
Explanation
According to the HCIA-5G V2.0 Exam Outline, cell unavailability due to system faults (specified using
N.Cell.Unavail.Dur.System) is caused by factors such as CPRI link faults, board faults, and faults on an RF module's TX or RX channels, which correspond to options A, C, and D. Blocking cells by using MML commands is not a system fault, but a manual operation, which corresponds to option B.
質問 # 30
Which of the following channels is used to send uplink power control commands?
- A. PUSCH
- B. POSCH
- C. PUCCH
- D. PDCCH
正解：D
解説：
Explanation
According to the Uplink Power Control, PDCCH is the channel that is used to send uplink power control commands, also known as TPC commands. These commands indicate how much power should be increased or decreased by the UE for PUSCH or PUCCH transmissions.
質問 # 31
In order to achieve ideal coverage, what is the clearance requirement around an antenna?
- A. 1-5m
- B. 50-100m
- C. 5000-10000m
- D. 5-10m
正解：D
解説：
Explanation
In order to achieve ideal coverage, there should be a clearance zone around an antenna of at least d, where d is the Fraunhofer or Rayleigh distance at which the near/far-field transition zone exists 17. This distance depends on the largest dimension of the antenna, D, and the operating wavelength, \uF06C. Ideally, D should be at least a half of a wavelength, which gives a minimum clearance zone of a half-wavelength. For example, at 2.4 GHz, the wavelength is about 0.125 m, so the minimum clearance zone is about 0.0625 m. However, in practical situations, this clearance zone is often compromised and the effects must be determined through simulation or empirical measurement 18. A general guideline is to have a clearance zone of 5-10 m around an antenna to avoid significant degradation of performance 19. Therefore, the best answer is C.
質問 # 32
Which of the following statements about downlink beamforming are correct?(Select All that Apply)
- A. Only the PDSCH supports beamforming.
- B. Both broadcast channels and traffic channels support beamforming.
- C. Dynamic beams are used for traffic channels.
- D. Static beams are used for broadcast channels.
正解：B、C、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 # 33
In a Huawei base station, which of the following bearers can only be configured as an MCG bearer?
- A. QQ1
- B. QCI6
- C. QCI9
- D. QCI2
正解：D
解説：
Explanation
According to the LTE-NR tight-interworking and the first steps to 5G, in a Huawei base station, QCI2 can only be configured as an MCG (Master Cell Group) bearer. QCI2 is a voice bearer that requires low latency and high reliability. Therefore, it cannot be configured as an SCG (Secondary Cell Group) bearer or a split bearer that may introduce additional delay or packet loss. QCI6, QCI9, and QQ1 can be configured as either MCG bearers, SCG bearers, or split bearers depending on the service requirements and network conditions.
質問 # 34
Which of the following spectrum sharing technologies can be used in the 3.5 GHz+2.1 GHz uplink and downlink decoupling/super uplink architecture?
- A. 3.5 GHz NR and 2.1 GHz LTE only share the uplink spectrums.
- B. 2.1 GHz NR and 2.1 GHz LTE only share the uplink spectrums.
- C. 2.1 GHz NR and 2.1 GHz LTE share both the downlink and uplink spectrums.
- D. 3.5 GHz NR and 2.1 GHz LTE share both the downlink and uplink spectrums.
正解：A
解説：
Explanation
According to the HCIA-5G V2.0 Exam Outline, the 3.5 GHz+2.1 GHz uplink and downlink decoupling/super uplink architecture uses spectrum sharing technologies such as Dynamic Spectrum Sharing (DSS) and Spectrum Sharing (SS) to enable 3.5 GHz NR and 2.1 GHz LTE to share only the uplink spectrums, while the downlink spectrums are used exclusively by each technology.
質問 # 35
Which of the following logical channels can be mapped to different transport channels?
- A. BCCH
- B. DCCH
- C. CCCH
- D. PCCH
正解：B、C、D
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 # 36
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