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Wireless Broadband Service (Part II)

Another step of High Speed Broadband for ISPs.

Wi-Fi technology is developed and extended to support a higher level of data transfer. The deficiencies related to security and systems administration have been solved and announced as IEEE 802.11 standard. There are several specifications in the 802.11 family such as 802.11a, 802.11b, and 802.11g. While 802.11a and 802.11g are capable of providing up to 54 Mbps transmission in 5 GHz and 2.4 GHz bands respectively, 802.11b is capable of providing up to 11 Mbps transmission in 2.4 GHz band. As the public band allowed by Thai law is 2.4 GHz, the Wi-Fi standards commonly seen in Thailand are limited to 802.11b and 802.11g or 802.11b/g. However, the Wi-Fi has some limitations regarding the distance and strength of signal because it could only support the range of not more than 300 feet as the technology was originally developed for Wireless LAN applications.

Therefore, to meet the increasing demand for Broadband Internet which offers higher transmission rate and support a wider range of area, the idea to invent Wireless WAN emerged. However, expansion of HotSpot locations still requires a wired connection among locations and installation of a large number of wireless access point devices so that it could cover a designated area and accommodate the needs of users in that area. Due to this reason, the new standard called WiMAX was invented to support Wireless WAN applications.

The idea behind WiMAX was originated from the development of WiFi but the technology was further designed and improved in terms of transmission and connectivity to accommodate wider range and faster speed. The standard was created to support Broadband Internet and was determined to be the backbone for extending HotSpot locations in the near future. Although the newly developed WiFi can cover a wider range and deliver high speed, it needs a large and expensive antenna to send out the signals. To this moment, it is therefore, aimed at service providers and businesses, not for end consumers. The short-term objective of WiMAX is to replace the current wired services such as leased line or to extend the service to remote areas such as upcountry or islands where investment on wired infrastructure is not cost-effective. There is also a strong tendency to use WiMAX as the backbone for expanding HotSpot locations in the future so as to make sure the current WiFi users can still use WiFi supported devices.

ѹ 26 - 06 - 2006  

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