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CHAPTER 2.
SPI-2331
2.1 Introduction to Outdoor SPI-2331
As an ultra-small RAS of Mobile WiMAX, the outdoor SPI-2331 connects Mobile
WiMAX to MS under ACR control.
The outdoor SPI-2331 interfaces with MS via a wireless channel observing the Mobile
WiMAX standard(IEEE 802.16e) and provides high-speed data service and multimedia
service in wireless broadband.
To this end, the outdoor SPI-2331 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-2331 and set/hold/disconnect the packet call
connection, handover control and ACR interface function and system operation
management function.
The outdoor SPI-2331 is connected to the ACR via Fast Ethernet and it can send/receive
diverse control signals and traffic signals using a stable and fast process.
The outdoor SPI-2331 is installed in the outdoor environment and managed in the omni
method. In addition, the outdoor SPI-2331 supports the capacity of the maximum 1Carrier/
Omni and MIMO only with the basic cabinet.
The characteristics of the outdoor SPI-2331 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.
© SAMSUNG Electronics Co., Ltd.
Mobile WiMAX Outdoor RAS SPI-2331 System Description
Overview of Outdoor
2-1
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