Samsung Mobile WiMAX Outdoor RAS SPI-2331, Описание системы

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Mobile WiMAX Outdoor RAS SPI-2331 System Description
© SAMSUNG Electronics Co., Ltd. 1-1
CHAPTER 1. Overview of Mobile
WiMAX System
1.1 Introduction to Mobile WiMAX
The Mobile WiMAX system is the wireless network system that supports IEEE 802.16e-
2005 base service. The IEEE 802.16e-2005 standard is the basis of Mobile WiMAX, and
adds the technologies supporting mobility, which include handover, paging and others, to IEEE
802.16-2004 defining fixed wireless internet access service.
The wireless LAN(WLAN, Wireless Local Area Network) can provide high speed data
services, but its radio wave is short and covers only small areas, and also gives limited user
mobility. It is difficult for WLAN to ensure Quality of Service(QoS) for data service.
On the contrary, the present mobile communication networks support the mobility of the
users, but the service charge and the cost of system operations are high due to the limited
wireless resources. To provide faster service in the existing mobile communication
networks, it requires a separate wireless communication technology such as High Speed
Downlink Packet Access(HSDPA) for the data services.
Mobile WiMAX can, therefore, overcome the limitations of the WLAN and present mobile
communication networks, and accommodate only the advantages of the system.
Mobile WiMAX can ultimately provide the high speed wireless internet services with low
cost at any time and in anyplace.
Samsung Mobile WiMAX System provides high speed data services using the transmission
technology of Orthogonal Frequency Division Multiple Access(OFDMA) by the Time
Division Duplex(TDD), and can give wider coverage compared to the existing WLAN.
The system performance and the capacity have been expanded by the high performance
hardware, and thus, it can easily give various functions and services to the users.
The Mobile WiMAX system consists of Radio Access Station(RAS), Access Control
Router(ACR) and Mobile WiMAX System Manager(WSM). RAS manages 802.16
Medium Access Control(MAC)/Physical Layer(PHY) function for Mobile Station(MS),
ACR manages various control functions and interworking function between Mobile
WiMAX ASN system and CSN system.