Network Topology
The 5G indoor distributed base station system comprises a BBU, HUB and RRUs:
• Baseband Unit (BBU): installed in the equipment room, processes the complete 5G protocol stack and provides 4 downstream optical ports for HUBs or direct RRU connections.
• Expansion Unit (rHUB): increases the number of pRRUs connected to a BBU, forwards downlink digital signals, combines uplink digital signals and supplies power to indoor pRRUs.
• Remote Radio Unit (RRU): installed where coverage is required, transmits and receives radio signals and converts between RF and digital baseband data.
