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NEW QUESTION # 22
Which of the following boards support CPU usage query?(Select All that Apply)
- A. FAN
- B. UPEU
- C. UMPT
- D. UBBP
Answer: B,C,D
Explanation:
Explanation
According to the Huawei 5G Base Station Product Description, the following boards support CPU usage query:
UPEU (Universal Power and Environment Interface Unit): It provides power supply and environment monitoring functions for other boards in a subrack. It supports CPU usage query through commands or web pages.
UMPT (Universal Main Processing and Transmission Unit): It provides main processing and transmission functions for a subrack. It supports CPU usage query through commands or web pages.
UBBP (Universal Baseband Processing Unit): It provides baseband processing functions for a subrack.
It supports CPU usage query through commands or web pages.
The FAN (Fan Unit) does not support CPU usage query because it does not have a CPU.
NEW QUESTION # 23
Which of the following is not a function of the 5G RRC layer?
- A. Encryption, decryption, and integrity protection
- B. Radio resource management
- C. Handover and mobility
- D. Access control
Answer: A
Explanation:
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.
NEW QUESTION # 24
In the uplink rate test for NR users, which of the following values is the recommended uplink maximum MIMO layers for 2T4R UEs?
- A. Layer2
- B. Layer4
- C. Layer1
- D. Layer3
Answer: A
Explanation:
Explanation
According to the HCIA-5G V2.0 Exam Outline, the uplink maximum MIMO layers for 2T4R UEs is 2, which corresponds to option B.
NEW QUESTION # 25
Which of the following protocol layers has been added to the 5G air interface protocol stack compared with
4G?
- A. RRC
- B. POCP
- C. SDAP
- D. MAC
Answer: C
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 # 26
Which of the following statements about the space principles for 5G BBU installation are correct?(Select All that Apply)
- A. If the remaining space of an existing cabinet is greater than 4 U, the BBU can be installed directly.
- B. If the installation space is insufficient, install 5G boards directly into the existing 4G B8U.
- 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, the BBU can be installed on a wall. Ensure that the wall meets the load bearing requirements.
Answer: A,C,D
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 # 27
Which of the following protocols/data belong to Layer 3 of the Uu interface?(Select All that Apply)
- A. MAC protocol
- B. IP data
- C. RLC protocol
- D. RRC protocol
Answer: D
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 # 28
What is the maximum bandwidth in mmWave bands as defined in 3GPP Release 16?
- A. 100MHz
- B. 60MHz
- C. 20MHz
- D. 400MHz
Answer: D
Explanation:
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.
NEW QUESTION # 29
Which of the following statements about the advantages of the Rayce ray tracing model are correct?(Select All that Apply)
- A. It offers more accurate path searching, reflection, and diffraction energy calculation for electromagnetic wave propagation.
- B. It is applicable only to C-band, and not mmWave.
- C. It offers more accurate modeling for massive MIMO.
- D. It offers higher level prediction accuracy.
Answer: A,D
Explanation:
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.
NEW QUESTION # 30
In order to achieve ideal coverage, what is the clearance requirement around an antenna?
- A. 5-10m
- B. 50-100m
- C. 1-5m
- D. 5000-10000m
Answer: A
Explanation:
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.
NEW QUESTION # 31
Which of the following logical channels can be mapped to different transport channels?
- A. CCCH
- B. PCCH
- C. BCCH
- D. DCCH
Answer: A,B,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 # 32
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
Answer: B
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 # 33
Which of the following are common causes of overshoot coverage?(Select All that Apply)
- A. Signals travel far along a street due to the waveguide effect.
- B. Reflection in a large amount of water.
- C. The height of the antenna or AAU is too low.
- D. The transmit power of a base station is too high.
Answer: A,B
Explanation:
Explanation
According to the HCIA-5G - Huawei Enterprise Support Community, reflection in a large amount of water and signals traveling far along a street due to the waveguide effect are common causes of overshoot coverage, which correspond to options A and C.
NEW QUESTION # 34
In an intra-frequency reselection procedure, which message contains the rangeToBestCell parameter?
- A. SIB3
- B. SIB2
- C. SIB1
- D. SIB4
Answer: B
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 # 35
Handover execution failures can use the counters to collect failure reasons in SA networking.
- A. False
- B. True
Answer: B
Explanation:
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.
NEW QUESTION # 36
Which of the following RF modules support 64T64R?(Select All that Apply)
- A. AAU5612
- B. AAU5613
- C. RRU3939
- D. AAU5313
Answer: B,D
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 # 37
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