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LTE eNB System Description v2.0 12
Copyright © 2017, All Rights Reserved.
Chapter 2 LTE eNB Overview
Introduction to System
In LTE system, eNB is located between UE and EPC. The eNB provides mobile
communications services to subscribers according to LTE air interface standard.
The eNB transmits/receives radio signals to/from UE and processes the
modulation and demodulation of packet traffic signals. The eNB is also
responsible for packet scheduling and radio bandwidth allocation and performs
handover via interface with EPC.
The eNB consists of Digital Unit (DU) and Radio Unit (RU).
The CDU is a digital unit (19-inch shelf) and can be mounted into indoor or
outdoor 19-inch commercial rack.
The RRH is a RF integration module consisting of a transceiver, power amplifier,
and filter. It transmits and receives traffic, clock information, and alarm/control
messages to and from the CDU. The RRH has 4Tx/4Rx, 2Tx/4Rx or 2Tx/2Rx
configurations supporting optic CPRI and can be installed on outdoor wall or pole.
The main features of eNB are as follows:
High Compatibility and Interoperability
The eNB complies with the specifications released based on the 3GPP standard.
So, it has high compatibility and interoperability.
High-Performance Modular Structure
The eNB has high-performance with the use of high-performance processors.
It is easy to upgrade hardware and software because of its modular structure.
Support for Advanced RF and Antenna Solutions
The eNB adopts the power amplifier to support wideband operation bandwidth and
Multiple Input Multiple Output (MIMO).
Separation of CDU and RRH
The eNB consists of CDU and RRH separately for easy installation and flexible
network configuration. In case of connection between CDU and RRH, data traffic
signals and OAM information are transmitted/received through the Digital I/Q and
C & M interface based on the Common Public Radio Interface (CPRI). Physically,
optic cables are used.
The CDU and RRH are supplied DC -48 V DC power from a rectifier respectively.
Flexible Network Configuration