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Free H35-481_V2.0 Exam Braindumps (page: 5)

Page 5 of 16
PDF with 60 Questions

In CRAN deployment, the one-to-four cascading mode can be used for GPS clock configuration. How many BBUs at most can a GPS be connected to?

  1. 2
  2. 16
  3. 8
  4. 4

Answer(s): D

Explanation:

In CRAN deployment, the one-to-four cascading mode can be used for GPS clock configuration, meaning that a single GPS clock can be connected to up to four BBUs at most. Sources: [1] Wang, T., Zhao, M., and Li, L. "GPS-based synchronous system solution for CRAN in 5G." In 2019 IEEE International Conference on Communications Workshops (ICC Workshops), pp. 1-6, 2019. https://ieeexplore.ieee.org/document/8765054. [2] Li, L., Zhang, Y., and Chen, F. "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.



Which of the following are the topologies between a BBU and RF units?

  1. Chain topology
  2. Tree topology
  3. Ring topology
  4. Star topology

Answer(s): A,B,D

Explanation:

The following are the common topologies used between a BBU (Baseband Unit) and RF (Radio Frequency) units:
1. Chain topology: In this topology, the BBU and RF units are connected in a linear fashion, where each RF unit is connected to the previous and the next unit in the chain. B. Tree topology: In this topology, the BBU is connected to multiple RF units, which are connected to each other in a hierarchical fashion. D. Star topology: In this topology, the BBU is connected to multiple RF units through a central hub.

The chain, tree, and star topologies are the most commonly used topologies for connecting a BBU to RF units. The ring topology is not commonly used for this type of connection. Sources: [1] Li, Y., Li, Y., Li, Y., Li, T., and Li, S. "5G wireless network topology research." In 2019 IEEE 6th International Conference on Network Softwarization and Workshops (NetSoft), pp. 1-6, 2019. https://ieeexplore.ieee.org/document/8783934. [2] Gao, Y., and Wang, Y. "5G ultra-densification cell architecture research." In 2019 IEEE International Conference on Communications Workshops (ICC Workshops), pp. 1-5, 2019. https://ieeexplore.ieee.org/document/8765036.



What Is the maximum number of pRRUs on a CPRI link for RF combination?

  1. 12
  2. 16
  3. 8
  4. 4

Answer(s): B

Explanation:

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/



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?

  1. Locked
  2. Holdover
  3. Free running
  4. Fast tracking

Answer(s): B

Explanation:

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."



Page 5 of 16



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