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質問 14
The STR CROSFEEDTST command can be used to check for crossed feeder connections of an AAU.
- A. False
- B. True
正解: B
質問 15
Which of the following boards is added, the base station Is reset and you need to log in to the LMT again?
- A. UPEU
- B. UEIU
- C. OUMPT
- D. UBBP
正解: D
解説:
The UBBP board is added to the base station when it is reset, and you need to log in to the LMT again in order to access the new UBBP board. The UBBP board is used for configuration, monitoring, and maintenance of the base station.
https://www.gsma.com/futurenetworks/wiki/5g-implementation-guidelines/
5G Implementation Guidelines: NSA Option 3 - Future ... - GSMA
https://www.gsma.com/futurenetworks/wiki/5g-implementation-guidelines/
https://arxiv.org/pdf/2202.01032
Understanding O-RAN: Architecture, Interfaces, Algorithms, Security ...
https://arxiv.org/pdf/2202.01032
https://www.fcc.gov/file/18918/download
Report on Risks to 5G from Legacy Vulnerabilities and Best ...
https://www.fcc.gov/file/18918/download
According to Huawei's official documentation, when the UBBP (Universal Baseband Processing) board is added, the base station is reset and you need to log in to the LMT (Local Management Terminal) again. The addition of other boards (OUMPT, UPEU, UEIU) may not require a reset and re-login.
質問 16
5G can enable smart manufacturing and upgrade the manufacturing business model. Which of the following are smart manufacturing scenarios empowered by 5G?
- A. Precise positioning and transportation
- B. Collaborative control between machines
- C. Real-time operation guidance for industrial AR
- D. Machine vision positioning & detection
正解: C
質問 17
Which of the following synchronization rasters can be used by a UE during a cell search?
- A. 1.44MHz
- B. 1200kHz
- C. 17.28MHz
- D. 100kHz
正解: A,B,C
解説:
During a cell search, a UE uses synchronization signals to synchronize to a cell and obtain basic system information. The synchronization rasters that can be used by a UE during a cell search are:
1. 17.28MHz: This is the synchronization raster that is used for the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) in 5G NR.
2. 1200kHz: This is the synchronization raster that is used for the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) in 4G LTE.
3. 1.44MHz: This is the synchronization raster that is used for the cell-specific reference signal (CRS) in 4G LTE.
質問 18
The PING, TRACERT, CFMTRACE, CFMPING, and UDPECHO commands cannot be executed simultaneously on the same board in a gNodeB.
- A. True
- B. False
正解: B
質問 19
Which of the following channels is not involved in NR random access of a UE?
- A. PDCCH
- B. PUSCH
- C. PRACH
- D. PUCCH
正解: B
解説:
In 5G NR, the random access procedure is used by a UE to establish a connection with the base station. The channels involved in the NR random access of a UE are:
1. PDCCH (Physical Downlink Control Channel): The PDCCH is used by the base station to transmit control information to the UE, such as scheduling assignments and uplink grants.
2. PRACH (Physical Random Access Channel): The PRACH is used by the UE to transmit the random access preamble to the base station.
3. PUCCH (Physical Uplink Control Channel): The PUCCH is used by the UE to transmit control information to the base station, such as uplink scheduling requests and HARQ feedback.
4. PUSCH (Physical Uplink Shared Channel) is not involved in NR random access of a UE, it is a shared channel used to transmit the uplink data and control information.
https://www.atis.org/wp-content/uploads/3gpp-documents/Rel16/ATIS.3GPP.38.401.V1620.pdf ATIS 3GPP
https://www.atis.org/wp-content/uploads/3gpp-documents/Rel16/ATIS.3GPP.38.401.V1620.pdf
https://www.etsi.org/deliver/etsi_ts/138300_138399/138300/16.04.00_60/ts_138300v160400p.pdf TS 138 300 - V16.4.0 - 5G; NR; NR and NG-RAN Overall description ...
https://www.etsi.org/deliver/etsi_ts/138300_138399/138300/16.04.00_60/ts_138300v160400p.pdf
https://www.3gpp.org/ftp/tsg_ran/WG2_RL2/Specifications/202012_draft_specs_after_RAN_90/Draft_36300-fc0.docx
3GPP TS 36.300
https://www.3gpp.org/ftp/tsg_ran/WG2_RL2/Specifications/202012_draft_specs_after_RAN_90/Draft_36300-fc0.docx
質問 20
What does it mean when the RUN indicator of an AAU is blinking green (on for is and off for Is)?
- A. The board is working properly.
- B. There is power supply, but the board is faulty.
- C. There is no power supply, or the board is faulty.
- D. Software is being loaded to the board, or the board is not started.
正解: D
解説:
According to Huawei official documentation, When the RUN indicator of an AAU is blinking green (on for 1s and off for 1s), it means that the software is being loaded to the board, or the board is not started.
質問 21
Which of the following parameters jointly identify the coverage area of an NRDUCELL?
- A. NRDUCELUd
- B. NRCELUd
- C. NrDuCellTrpId
- D. NrDuCellCoverageld
正解: D
質問 22
Which of the following are the topologies between a BBU and RF units?
- A. Ring topology
- B. Tree topology
- C. Chain topology
- D. Star topology
正解: A
質問 23
In NSA networking, which of the following factors affect the downlink peak rate of a CPE?
- A. Downlink transmit power of the NR base station
- B. CPE location
- C. Downlink BLER of 3% or above
- D. Uplink transmit power of the CPE
正解: A
質問 24
Which of the following X2 Interconnection solutions are supported by LTE and NR base stations?
- A. Interconnection through traditional IP RAN
- B. Interconnection through the a
- C. Interconnection through RF modules
- D. Interconnected through the backplane in co-BBU separate-MPT scenarios
正解: D
質問 25
What Is the maximum number of pRRUs on a CPRI link for RF combination?
- A. 0
- B. 1
- C. 2
- D. 3
正解: D
解説:
The maximum number of pRRUs on a CPRI link for RF combination is 16. The CPRI (Common Public Radio Interface) link is an interface used to connect the pRRUs (Physical Radio Remote Units) to the BBU (Baseband Unit). The pRRUs contain the radio modules and antennas, while the BBU contains the baseband processing unit. The CPRI link allows the BBU to send and receive data from the pRRUs, enabling them to be combined for RF combination. Sources: [1] Chen, F., and Zhang, Y. "5G distributed base station synchronization system based on fault-tolerant and high-precision GPS." In 2020 IEEE International Conference on Communications Workshops (ICC Workshops), pp. 1-5, 2020. https://ieeexplore.ieee.org/document/9160372. [2] Fan, X., and Zhao, X. "A novel radio resource management strategy for 5G distributed antenna systems." In 2019 IEEE International Conference on Communications Workshops (ICC Workshops), pp. 1-6, 2019. https://ieeexplore.ieee.org/document/
質問 26
What is the typical output power of a 64T64R AAU?
- A. 80W
- B. 40W
- C. 20W
- D. 200W
正解: A
質問 27
In SA networking, which of the following are required after the Pa reconfiguration of a 5G base station?
- A. Checking whether the PCI on the NR side has taken effect on the NE.
- B. Checking whether the PCI on the LTE side has taken effect on the NE.
- C. Checking whether the 5G cell services are normal.
- D. Checking whether cell-related alarms are reported.
正解: D
質問 28
In NSA networking, X2 self-setup between a gNodeB and an eNodeB requires that the gNodeB and eNodeB be managed by the same OSS.
- A. False
- B. True
正解: B
解説:
In Non-standalone (NSA) networking, X2 self-setup between a gNodeB and an eNodeB requires that the gNodeB and eNodeB be managed by the same OSS. Because gNodeB and eNodeB are managed by the same OSS, the OSS can configure the X2 self-setup parameters, such as the X2 self-setup switch, the X2 interface IP address, and the X2 self-setup trigger conditions. Only when the gNodeB and eNodeB are managed by the same OSS and configured with the same X2 self-setup parameters, the gNodeB and eNodeB can establish an X2 self-setup connection.
質問 29
In NSA networking, X2 Interface self-setup between the 4G and 5G base stations falls. Which of the following are possible causes?
- A. The 5G and 4G base stations belong to different PLMNs.
- B. The number of links established over the LTE X2 interface exceeds the board specifications.
- C. The self-setup switch is not turned on.
- D. Cell setup fails on the LTE side.
正解: C
解説:
The self-setup switch is not turned on. In NSA networking, X2 Interface self-setup between the 4G and 5G base stations falls if the self-setup switch is not turned on. This is because the switch must be enabled in order for the base stations to establish a connection. Other possible causes include the 5G and 4G base stations belonging to different PLMNs (Public Land Mobile Networks), cell setup failing on the LTE side, and the number of links established over the LTE X2 interface exceeding the board specifications. Reference: https://www.qualcomm.com/invention/5g/non-standalone-networking-5g-nsa-networks
質問 30
In SA networking, which of the following are required after the Pa reconfiguration of a 5G base station?
- A. Checking whether the PCI on the NR side has taken effect on the NE.
- B. Checking whether the 5G cell services are normal.
- C. Checking whether the PCI on the LTE side has taken effect on the NE.
- D. Checking whether cell-related alarms are reported.
正解: A,C,D
解説:
After the PA reconfiguration of a 5G base station in SA networking, it is necessary to check whether cell-related alarms are reported, whether the 5G cell services are normal, and whether the PCI on the NR side has taken effect on the NE. These checks are necessary to ensure that the reconfiguration has been successful.
質問 31
If the dock of a base station is locked and the base station fails to obtain clock source signals, which of the following clock states is the base station in?
- A. Locked
- B. Fast tracking
- C. Holdover
- D. Free running
正解: C
解説:
The base station is in a Holdover state when the dock of a base station is locked and the base station fails to obtain clock source signals. Holdover is a state during which the base station uses the last known frequency and time information to maintain synchronization and clock accuracy. According to the Huawei official documentation, "when the clock source is lost, the base station enters the holdover state. In the holdover state, the base station uses the last known frequency and time information to maintain synchronization and clock accuracy. Holdover time is the duration for which the base station can maintain synchronization after the clock source is lost."
質問 32
Which of the following are the functions of SRSs In NR?
- A. To obtain the uplink channel quality
- B. Downlink beamforming weight calculation
- C. Uplink grant
- D. Uplink beam management
正解: A
質問 33
If multiple IP addresses with different next hop addresses are planned for the gNodeB, which of the following route configuration modes is not applicable?
- A. Destination address route configuration
- B. Source address route configuration
- C. Direct route configuration
正解: A
質問 34
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