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Wireless Broadband Service (Part I)

History of Wireless Network

It is not surprising that wireless technology nowadays has an important role in our daily life. Limitations of wired technology in terms of required installation period, budget in creation and maintenance of network give wireless technology an advantage over wired technology. Despite recent development in speed of wired technology which can be applied over existing infrastructure such as DSL, it is estimated that the future needs for high speed network will increase dramatically and will consequently lead to expansion of backbone network in order to meet increasing demand of end users. However, backbone network cannot extend to some areas as it is not cost-effective in terms of investment. In some cases, there is some inconvenience in accessing the area or it is not possible to lay the wire across that area. Wireless technology, therefore, becomes the only solution to these constraints.

With physical constraints of wired network, especially copper-wire network which is not convenient and does not fit users who need a mobile lifestyle, wireless technology is developed to answer this problem. The application of wireless technology started with the introduction of mobile phone network which connected between service providers and users. At starting period, we used AMPS, TDMA and GSM or 1G (First Generation) technologies with maximum speed at 9.6 Kbps. The technologies were further developed and became 2G, 2.5G, 2.75G at speed of 14.4 - 20 Kbps, 115 Kbps and 384 Kbps respectively through the use of GPRS and EDGE over GSM network. It was around that period that CDMA technology with enhanced speed was introduced and it marked the beginning of 3G with 1xEV (CDMA2000) and 1xEVDO (CDMA2000) technologies which the ability to provide the connection bandwidth of 2,000 Kbps and 2,500 Kbps respectively.

While there is an effort to develop and make use of mobile phone network for high speed applications, computer and communication industry also tries to develop some other types of wireless network to make it possible for computer to communicate with adjacent devices and connect with LAN without using a wire. Infared and Bluetooth technologies are developed to connect between computer and its accessories as well as between computers or computer and PDA. This is where PAN (Personal Area Network) is originated. However, PAN still supports quite a limited speed and distance. To further meet the demand for mobile lifestyle, Wi-Fi or IEEE 802.11 technology is developed to support connection between computer and LAN. This facilitates the use of computer devices with high level of portability such as notebook computers or PDAs.

ѹ 25 - 06 - 2006  

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