User's Manual

Mobile WiMAX RAS SPI-2213 System Description

CHAPTER 2. Overview of SPI-2213

2.1 Introduction to SPI-2213

The SPI-2213, RAS of Mobile WiMAX, is controlled by ACR and connects Mobile

WiMAX calls to MS.

The SPI-2213 interfaces with MS via a wireless channel observing the Mobile WiMAX

standard (IEEE 802.16) and provides high-speed data service and multimedia service in

wireless broadband.

To this end, the SPI-2213 provides the following functions: modulation/demodulation of

packet traffic signal, scheduling and radio bandwidth allocation to manage air resources

efficiently and ensure Quality of Service (QoS), Automatic Repeat request (ARQ)

processing, ranging function, connection control function to transmit the information on the

SPI-2213 and set/hold/disconnect the packet call connection, handover control and ACR

interface function and system operation management function.

Physically, the SPI-2213 consists of a Digital Unit (DU) and a Mobile WiMAX base station

Remote Radio Head (RRH).

The RRH is located remotely from the DU. The DU is a digital unit of 19 in. shelf form

and can be installed in an indoor or outdoor 19 in. rack. It supports a capacity up to

2Carrier/3Sector. The DU is operated in omni or sector mode depending on the features of

the installation location.

An RRH is a standalone RF unit. It is installed on an outdoor wall or pole.

The SPI-2213 supports up to 2Carrier/3Sector. The RRH can be operated as follows

depending on the type.

y RRH-2 (RRH-2LB/RRH-2UB): 2Tx/2Rx RF path, MIMO mode

y RRH-2WB: 4Tx/4Rx RF path, 4T4R with CDD (Matrix A/B + CDD) mode