eNodeB
byRahul Kaundalon
eNodeB
The eNodeB is logically composed of two types of units:
- one or more BaseBand Units (BBU) perform the following functions:
- OA&M control of the eNodeB subunits
- backhaul
- clocking and network synchronization
- baseband processing
- communication to Radio Frequency (RF) Modules (RFM).
- one or more RFMs perform the following functions:
- conversion between a digital In-phase/Quadrature (I/Q) data stream from the BBU and RF signals transmitted or received via the RFM antenna ports
- local control of tower mounted amplifiers and antenna tilt units.
A specific grouping of BBUs and RFMs is referred to as an eNodeB configuration.
Radio Frequency Module (RFM)
The RF Module (RFM) provides conversion between I/Q baseband data and RF air interface signals. RFMs differ by:
- supported band class
- maximum RF output power
- number of transmit paths
- number of receive paths
- cabinet mounted TRDUs vs. outdoor RRHs.
