User's Manual

Confidential

Chapter 2 LTE eNB Overview

LTE eNB System Description v2.0 13

The RRH is not a standalone device; it operates interfacing with CDU. The

RRH is highly flexible in its installation, and helps with setting up a network

in a variety of configurations depending on the location and operation method.

 Easy Installation

The optic interface component that interfaces with CDU and RF signal

processing component is integrated into RRH, which becomes a very small

and very light single unit. The RRH can be installed on a wall, pole, or floor.

In addition, as the distance between RRH and antenna is minimized, the loss

of RF signals due to the antenna feeder line can be reduced so that the line can

provide more enhanced RF receiving performance than the existing rack-type

eNB.

 Natural Convection Cooling

The RRH is designed to discharge heat effectively through natural convection

cooling without an additional cooling device. No additional maintenance cost

is needed for cooling the RRH.

 Support for Loopback Test between CDU and RRH

The eNB provides loopback test function to check whether communication is

normal on a Digital I/Q and C & M interface between the CDU and RRH.

 Remote Firmware Downloading

By replacing its firmware, RRH can be upgraded by service and performance.

The operator can download firmware to RRH remotely using a simple

command from LSM without visiting the local site. As a result, the number of

visits is minimized, leading to reduced maintenance costs and system

operation with ease.

MBSFN Transmission Support

Since eNB supports Multimedia Broadcast multicast service over a Single

Frequency Network (MBSFN) transmission, same data stream of the time

synchronized cells are transmitted to the same subcarriers at the same time so that

UE can recognize the data transmitted from multiple cells as the data transmitted

from a single cell and the interference among the cells can be reduced. The sub-

frame of the data stream always uses extended Cyclic Prefix (CP) to prevent

interference to the delay spread.