User's Manual

Mobile WiMAX RAS SPI-2213 System Description/Ed.02

3.2.2 RRH

The RRH is a remote RF device that supports Mobile WiMAX services.

It is installed at a remote location from the DU. It performs the function that connects

mobile WiMAX calls to an MS, as defined in the 802.16d/e standard.

Main Functions

Below are the major functions of the RRH.

y High-power amplification of RF transmission signal

y Interfaces optically with the MRA-F of the DU using ‘Digital I/Q and C & M’ and

carries out interfacing for traffic, alarms, control signals, and clock information.

y Upconversion/downconversion of frequency

y Gain control of RF Rx/Tx signal

y Rx/Tx RF signal from/to an antenna

y Suppression of out-of-band spurious wave emitted from RF Rx/Tx signal

y Low noise amplification of band-pass filtered RF Rx signal (Low Noise Amplifier,

LNA)

y TDD switching function for Tx/Rx path

y Includes the filter part connected to the antenna

y Remote Electrical Tilting (RET) function(option)

RET

The RET is an optional function that the vendor can select. Refer to 5.1.

RRH Description

The RRH is a RF module of the SPI-2213, and supports sending/receiving RF paths.

RRH of this system is as follows:

Category EA Capacity RF Path Antenna Output

RRH-

2LB/

RRH-2UB

Max. 3 2Carrier/1Sector

(Contiguous 2Carriers)

MIMO (2Tx/2Rx) Outputs 4W/Sector/Carrier at 2

antenna ports each

RRH-

2WB

Max. 3 2Carrier/1Sector

(Contiguous 2 Carrier)

4T4R with CDD

(4Tx/4Rx)

Outputs 5 W/Sector/Carrier at

4 antenna ports each