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NEW QUESTION # 19
Which of the following protocols/data belong to Layer 3 of the Uu interface?(Select All that Apply)
- A. MAC protocol
- B. RRC protocol
- C. RLC protocol
- D. IP data
Answer: B
Explanation:
Explanation
According to the LTE user plane protocol stack, the Layer 3 of the Uu interface consists of the RRC protocol and the IP data. The RRC protocol is responsible for radio resource management, access control, handover and mobility, and encryption and integrity protection. The IP data is the payload of the user plane that is transmitted over the PDCP layer.
NEW QUESTION # 20
Which of the following counters can be measured at the board level?
- A. CCE usage
- B. Number of paging messages
- C. CPU usage
- D. Transmission interface measurement
Answer: C,D
Explanation:
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.
NEW QUESTION # 21
Which of the following AAUs support vertical beamforming?(Select All that Apply)
- A. 8T8R
- B. 32T32R
- C. 64T64R
- D. 4T4R
Answer: B,C
Explanation:
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.
NEW QUESTION # 22
Which of the following logical channels can be mapped to different transport channels?
- A. BCCH
- B. CCCH
- C. DCCH
- D. PCCH
Answer: B,C,D
Explanation:
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.
NEW QUESTION # 23
CU-DU Split of a base station means that the base station's control plane functions and user plane functions are separated.
- A. True
- B. False
Answer: A
Explanation:
Explanation
According to the China's Approach to Military 5G Networks and Related Military Applications, CU-DU Split of a base station means that the base station's control plane functions (CU) and user plane functions (DU) are separated, which can improve network flexibility and scalability.
NEW QUESTION # 24
Which of the following channels/signals require demodulation reference signals (DMRSs)?(Select All that Apply)
- A. DPOSCH
- B. DPDCCH
- C. DPBCH
- D. DCSI-RS
Answer: A,B,C
Explanation:
Explanation
According to the 5G NR Physical Layer Specifications, demodulation reference signals (DMRSs) are required for the following channels/signals in the downlink and uplink:
Downlink Physical Broadcast Channel (DPBCH)
Downlink Physical Downlink Control Channel (DPDCCH)
Downlink Physical Shared Channel (DPOSCH)
Uplink Physical Random Access Channel (PRACH)
Uplink Physical Uplink Control Channel (PUCCH)
Uplink Physical Uplink Shared Channel (PUSCH)
NEW QUESTION # 25
Which of the following is not covered by a site survey?
- A. Antenna installation space
- B. Models of hardware boards on base stations
- C. Equipment room space and load bearing capacity
- D. Site location
Answer: B
Explanation:
Explanation
A site survey is an inspection of an area where work is proposed, to gather information for a design or an estimate to complete the initial tasks required for an outdoor activity 1. A site survey can cover various aspects, such as antenna installation space, equipment room space and load bearing capacity, site location, and other environmental factors 2. However, a site survey does not cover the models of hardware boards on base stations, as this information is not related to the physical characteristics of the site. The models of hardware boards on base stations are determined by the network design and configuration, which are based on the network requirements and specifications 3. Therefore, the correct answer is C.
NEW QUESTION # 26
On a 5G network, the NAS layer uses 5G-GUTI to replace IMSI as the temporary ID of a UE for security reasons.
- A. True
- B. False
Answer: A
Explanation:
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).
NEW QUESTION # 27
The UPEU in the BBU5900 needs to be connected to two circuit breakers.
- A. True
- B. False
Answer: B
Explanation:
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.
NEW QUESTION # 28
Which of the following RF modules support 64T64R?(Select All that Apply)
- A. AAU5313
- B. AAU5613
- C. RRU3939
- D. AAU5612
Answer: A,B
Explanation:
Explanation
According to the Huawei Releases 5G Series Products, Huawei's AAU5313 and AAU5613 are both RF modules that support 64T64R. The AAU5313 is an ultra-wideband Massive MIMO product that supports both
64T64R and 400 MHz bandwidth on the C-band. The AAU5613 is a BladeAAU Pro product that supports 64T A+P integration on sub-3 GHz bands. The AAU5612 is a BladeAAU product that supports only 32T A+P integration on sub-3 GHz bands. The RRU3939 is not an AAU product but an RRU (Remote Radio Unit) product that supports only 8T8R on sub-3 GHz bands.
NEW QUESTION # 29
In downlink peak rate testing, the modulation and coding scheme (MCS) index must reach 32.
- A. True
- B. False
Answer: A
Explanation:
Explanation
According to the HCIA-5G V2.0 Exam Outline, in downlink peak rate testing, the modulation and coding scheme (MCS) index must reach 32, which corresponds to option A.
NEW QUESTION # 30
5G can meet service requirements in scenarios with a mobility speed of up to 500 km/h.
- A. True
- B. False
Answer: A
Explanation:
Explanation
According to the Huawei Career Certification Learning, 5G can meet service requirements in scenarios with a mobility speed of up to 500 km/h, which is much higher than the 4G limit of 350 km/h.
NEW QUESTION # 31
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 share both the downlink and uplink spectrums.
- B. 2.1 GHz NR and 2.1 GHz LTE share both the downlink and uplink spectrums.
- C. 3.5 GHz NR and 2.1 GHz LTE only share the uplink spectrums.
- D. 2.1 GHz NR and 2.1 GHz LTE only share the uplink spectrums.
Answer: C
Explanation:
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.
NEW QUESTION # 32
Which of the following factors does not affect downlink coverage?
- A. Base station receive diversity gain
- B. Antenna gain
- C. Downlink path loss
- D. Downlink transmit power
Answer: A
Explanation:
Explanation
According to the HCIA-5G V2.0 Exam Outline, base station receive diversity gain is a factor that affects uplink coverage, not downlink coverage. Downlink coverage is affected by factors such as downlink path loss, downlink transmit power, and antenna gain, which correspond to options B, C, and D.
NEW QUESTION # 33
In the NSA DC architecture, which of the following procedures is triggered when a UE moves to a neighboring gNodeB?
- A. SgNB release procedure
- B. SgNB change procedure
- C. MeNB release procedure
- D. MeNB change procedure
Answer: B
Explanation:
Explanation
According to the HCIA-5G V2.0 Exam Outline, in the NSA DC architecture, when a UE moves to a neighboring gNodeB, the SgNB change procedure is triggered, which corresponds to option D.
NEW QUESTION # 34
Which of the following statements about the space principles for 5G BBU installation are correct?(Select All that Apply)
- A. If the installation space is insufficient, the BBU can be installed on a wall. Ensure that the wall meets the load bearing requirements.
- B. If the remaining space of an existing cabinet is greater than 4 U, the BBU can be installed directly.
- C. If the space is greater than 600 mm, a cabinet can be added to install the BBU.
- D. If the installation space is insufficient, install 5G boards directly into the existing 4G B8U.
Answer: A,B,C
Explanation:
Explanation
According to the Hardware Description: Bbu5900 V100r013c10, these statements are correct about the space principles for 5G BBU installation:
If the installation space is insufficient, the BBU can be installed on a wall. Ensure that the wall meets the load bearing requirements: The BBU can be installed on a wall using wall-mounted brackets. The wall must be able to bear at least four times the weight of the BBU and must be flat and vertical. The installation height of the BBU must not exceed 2 m.
If the space is greater than 600 mm, a cabinet can be added to install the BBU: The BBU can be installed in a cabinet that meets the requirements of Huawei base stations. The cabinet must have a width of 19 inches and a depth of at least 600 mm. The cabinet must also provide sufficient ventilation, grounding, and lightning protection for the BBU.
If the remaining space of an existing cabinet is greater than 4 U, the BBU can be installed directly: The BBU can be installed in an existing cabinet that has enough space for it. The BBU has a height of 2 U, so it requires at least 4 U of space in a cabinet. The existing cabinet must also meet the requirements of Huawei base stations.
The other statement is incorrect about the space principles for 5G BBU installation:
If the installation space is insufficient, install 5G boards directly into the existing 4G B8U: This statement is not supported by Huawei base stations. The 5G boards cannot be installed directly into the existing 4G B8U because they have different slot distributions and board types. The 5G boards can only be installed in a BBU5900 subrack that supports both LTE and NR modes.
NEW QUESTION # 35
Which of the following protocol layers has been added to the 5G air interface protocol stack compared with
4G?
- A. POCP
- B. SDAP
- C. RRC
- D. MAC
Answer: B
Explanation:
Explanation
According to the HCIA-5G V2.0 Exam Outline, SDAP is a new protocol layer added to the 5G air interface protocol stack compared with 4G. SDAP stands for Service Data Adaptation Protocol, and it is used to map QoS flows to data radio bearers and perform header compression and decompression.
NEW QUESTION # 36
In an intra-frequency reselection procedure, which message contains the rangeToBestCell parameter?
- A. SIB3
- B. SIB1
- C. SIB2
- D. SIB4
Answer: C
Explanation:
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.
NEW QUESTION # 37
Which of the following factors does not need to be considered during PUSCH power calculation?
- A. Number of PUSCH RBs
- B. MCS index of the PUSCH
- C. SCS configuration for the PUSCH
- D. Number of PUSCH symbols in the time domain
Answer: B
Explanation:
Explanation
According to the 5G NR Uplink Power Control Procedure, MCS index of the PUSCH is not a factor that needs to be considered during PUSCH power calculation. The MCS index determines the modulation and coding scheme of the PUSCH, but it does not affect the transmit power. The other factors, such as number of PUSCH RBs, SCS configuration for the PUSCH, and number of PUSCH symbols in the time domain, are all involved in the PUSCH power calculation formula.
NEW QUESTION # 38
In SA networking, which of the following is the first step for a UE to perform a cell search?
- A. Obtain other cell information.
- B. Obtain the cell signal quality.
- C. Synchronize frames and obtain PCI group number.
- D. Synchronize half-frames and obtain the ID within a PCI group.
Answer: C
Explanation:
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.
NEW QUESTION # 39
Under the same gNodeB, an NR TDD cell supports the same maximum number of RRC_CONNECTED UEs as an NR FDD cell.
- A. True
- B. False
Answer: B
Explanation:
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.
NEW QUESTION # 40
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