H35-481_V2-0 Practice Questions

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.

According to Huawei official documentation, the following are possible causes of NRDUCELL

unavailability:

A. RF fault

B. BBP fault

C. Insufficient CPRI bandwidth

D. Clock exception. The RF, BBP,

and CPRI bandwidth are all important factors that contribute to the availability of the NRDUCELL. If

there is a problem with any of these components, it can cause the NRDUCELL to become unavailable.

Additionally, a clock exception, such as an issue with the timing or synchronization of the cell, can

also cause the NRDUCELL to become unavailable.

NRDUCELL unavailability can be caused by an RF fault, a BBP fault, insufficient CPRI bandwidth, or a

clock exception. According to this page, these are all possible causes of NRDUCELL unavailability.

The statement "The start symbol of a front-loaded DMRS of a type B PDSCH is always the first symbol

of PDSCH" is incorrect. In 5G NR, the start symbol of a front-loaded DMRS of a type B PDSCH can be

configured as the first symbol of PDSCH or as the second symbol of PDSCH.

You can refer to the Huawei official documentation for HCIP-5G-RAN V2.0 certification and the 3GPP

5G NR standard (38.211, 38.212, 38.213) for more information on PDSCH DMRS, including the

configurations of the front-loaded DMRS, the DMRS symbols and the optional and mandatory nature

of it.

Here are some official

Huawei HCIP-5G-RAN V2.0 certification page: https://e.huawei.com/en/certifications/hcip-5g-ranv2-0

3GPP 5G NR standard: https://www.3gpp.org/specifications/5g-nr-specifications

The segmentation method is the most important method for isolating faults on the transport

network. Different methods are used for different fault types, such as Optical Time Domain

Reflectometry (OTDR) for fiber faults, Radio Frequency Interference Measurement (RFI) for radio

interference, and Signal-to-Noise Ratio (SNR) for signal noise. By segmenting the network, faults can

be

easily

identified

and

isolated.

Reference:

https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/L2L3_VPN_Optimiza

tion_Solution/2-1_L2L3_VPN_Optimization_Solution_Chapter.html

The BLK BRD command can be used to block the BBP, DUPEU and AAU boards. This command is used

to temporarily block the boards and prevent them from being used for any purpose. The RRU board

cannot be blocked by running this command.

In 5G NR, the Master Information Block (MIB) message is transmitted on the Physical Broadcast

Channel (PBCH) and contains information that is used by the UEs to synchronize to the cell and

obtain basic system information. The parameters in the NR MIB message that indicate the time-

domain position of CORESET 0 are the least significant four bits of PDCCH-configSIBl.

One of the challenges of 5G network construction is to provide Indoor coverage in large stadiums,

where Indoor interference severely affects network coverage and capacity. One of the solutions that

can effectively mitigate the interference caused by Indoor coverage with high-density site

deployment is sector splitting. This solution involves dividing the cell into multiple smaller cells, each

with its own set of antennas and RF parameters. By reducing the number of users and devices in

each cell, sector splitting can significantly reduce the amount of interference and improve network

coverage and capacity.

According to the official 3GPP specification, the DCI of NR does not carry PUSCH power control

information. It carries scheduling information for the PUSCH and PDSCH and a PMI report.

Reference: https://www.3gpp.org/DynaReport/38-series.htm

According to Huawei's documentation, the STR CROSFEEDTST command can be used to check for

crossed feeder connections of an AAU. It is used to check whether the feeder cables of different

antennas are connected to the correct ports. The command can be executed on the AAU to detect

crossed feeder connections and ensure that the feeder cables are connected to the correct ports.

The statement A is incorrect. The larger the subcarrier spacing [1], the shorter the symbol duration

on each subcarrier, not the larger number of symbols. Statement B is also incorrect. The larger the

subcarrier spacing [1], the larger the CP length and the more suitable it becomes for wide coverage.

Statement C is correct. The smaller the subcarrier spacing, the lower the power spectral density.

Statement D is incorrect. The larger the subcarrier spacing [1], the shorter the slot length.

https://asp-eurasipjournals.springeropen.com/articles/10.1186/s13634-020-00696-1

1. A novel timing and frequency offset estimation algorithm for filtered ...

https://asp-eurasipjournals.springeropen.com/articles/10.1186/s13634-020-00696-1

https://www.sciencedirect.com/topics/engineering/extended-cyclic-prefix

Extended Cyclic Prefix - an overview | ScienceDirect Topics

https://www.sciencedirect.com/topics/engineering/extended-cyclic-prefix

http://www.techplayon.com/5g-nr-numerology-subcarrier-spcaing-scs/

5G NR Numerology - Subcarrier Spcaing (SCS) - Techplayon

http://www.techplayon.com/5g-nr-numerology-subcarrier-spcaing-scs/