User's Manual

Confidential

Chapter 2 LTE eNB Overview

LTE eNB System Description v2.0 14

Main Functions

The main functions of LTE eNB are as follows:

 Physical Layer Processing

 Call Processing Function

 IP Processing

 SON Function

 Interfacing with Auxiliary Devices

 Easy Operation and Maintenance

In case of availability and provision schedule of the features and functions

described in the system manual, refer to separate documentations.

Physical Layer Processing

The eNB transmits/receives data through the radio channel between EPC and UE.

To do so, eNB provides the following functions:

 OFDMA/SC-FDMA Scheme

 Downlink Reference Signal Creation and Transmission

 Downlink Synchronization Signal Creation and Transmission

 MBSFN Reference Signal Creation and Transmission

 Channel Encoding/Decoding

 Modulation/Demodulation

 Resource Allocation and Scheduling

 Link Adaptation

 HARQ

 Power Control

 ICIC

 MIMO

OFDMA/SC-FDMA Scheme

The eNB performs downlink OFDMA/uplink SC-FDMA channel processing that

supports LTE standard physical layer. The downlink OFDMA scheme allows the

system to transmit data to multiple users simultaneously using the subcarrier

allocated to each user. Depending on the channel status and transmission rate

requested by the user, downlink OFDM can allocate one or more subcarriers to a

specific subscriber to transmit data.