5G NR Base Station types

BS type 1-H 

BS type 1-H requirements are defined for two points of reference, signified by radiated requirements and conducted requirements. 

Radiated characteristics are defined over the air (OTA), where the operating band-specific radiated interface is referred to as Radiated Interface boundary (RIB). Radiated requirements are also referred to as OTA requirements. The characteristics in which the OTA requirements apply are detailed for each requirement. The transceiver unit array is part of the composite transceiver functionality generating modulated transmit signal structures and performing receiver combining and demodulation.

BS type 1-O and BS type 2-O

For BS type 1-O and BS type 2-O, the radiated characteristics are defined over the air (OTA), where the operating band-specific radiated interface is referred to as the Radiated Interface Boundary (RIB). Radiated requirements are also referred to as OTA requirements. For a BS type, 1-O the transceiver unit array must contain at least 8 transmitter units and at least 8 receiver units. Transmitter units and receiver units may be combined into transceiver units. The transmitter/receiver units have the ability to transmit/receiver parallel independent modulated symbol streams.

Base station classes

It covers Wide area base stations, Medium range base stations, and local area base stations. The Associated deployment scenarios for each class are exactly the same for BS with and without connectors. 

For BS type 1-O and 2-O, BS classes are defined as: 

Wide area base stations are characterized by requirements derived from Macrocell scenarios with a BS to UE minimum distance along the ground equal to 35m. 

Medium range base stations are characterized by requirements derived from microcell scenarios with a BS to UE minimum distance along the ground equal to 5m. 

Local area base stations are characterized by requirements derived from picocell scenarios with a BS to minimum coupling loss equal to 45dbB. 

Operating bands and channel arrangement

Requirements throughout the RF specifications are in many cases defined separately for different frequency ranges (FR). 

• FR1: 450 MHz - 6000 MHz
• FR2: 24250 MHz - 52600 MHz  

Minimum coupling loss requirements

• Wide Area Base station: MCL of 70 dB
• Medium range base station: MCL of 53 dB
• Local area base station: MCL of 45dB

The minimum distance between the base station and UE

• Wide Area Base station: 35m
• Medium range base station: 5m
• Local area base station: 2m