User's Manual

Mobile WiMAX Outdoor RAS SPI-2210 System Description

CHAPTER 2. Overview of Outdoor

SPI-2210

2.1 Introduction to Outdoor SPI-2210

The outdoor SPI-2210, RAS of Mobile WiMAX, is controlled by ACR and connects

Mobile WiMAX calls to MS.

The outdoor SPI-2210 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 outdoor SPI-2210 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 outdoor SPI-2210 and set/hold/disconnect the packet call

connection, handover control and ACR interface function and system operation

management function.

The outdoor SPI-2210 interfaces with ACR in one way of Fast Ethernet/Gigabit Ethernet

and can exchange various control signals and traffic signals stably.

The outdoor SPI-2210 is installed in the outdoor environment and managed in the omni or

sector method according to the property of the installed area. In addition, the outdoor SPI-

2210 supports the capacity of the maximum 3Carrier/3Sector and MIMO only with the

basic cabinet.

The characteristics of the outdoor SPI-2210 are as follows:

Application of the OFDMA Method

OFDMA is used to transmit data to several users simultaneously by using the sub-carrier

allocated to each user and transmit data by allocating one or more sub-carriers to a specific

subscriber according to the channel status and the transmission rate requested by a user.

In addition, since it can select the sub-carriers with excellent features for each subscriber

and allocate them to the subscribers when some subscribers divide and use the whole sub-

carrier, it can raise the data throughput by distributing the resources efficiently.