H35-481_V2.0 – HCIP-5G-RAN V2.0

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  Chain topology
  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.
  

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  Tree topology

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  Ring topology

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  Star topology

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  High signal attenuation is caused due to improper GPS remote distance.
  High signal attenuation is caused due to improper GPS remote distance. B. The antenna feeder between the base station and the GPS is faulty, for example, the cable is disconnected. C. The GPS is not installed in the correct position, and the number of locked satellites is less than 4. D. The GPS satellite card Is faulty.
  Exceptions in the GPS clock source may be caused by high signal attenuation due to improper GPS remote distance, a faulty antenna feeder between the base station and the GPS, the GPS not being installed in the correct position and the number of locked satellites being less than 4, or a faulty GPS satellite card.
  
  

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  The antenna feeder between the base station and the GPS is faulty, for example, the cable is disconnected.

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  The GPS is not installed in the correct position, and the number of locked satellites is less than 4.

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  The GPS satellite card Is faulty.

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  The 5G and 4G base stations belong to different PLMNs.

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  Cell setup fails on the LTE side.

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  The number of links established over the LTE X2 interface exceeds the board specifications.

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  The self-setup switch is not turned on.