08-02-2013, 03:44 PM
SEMINAR REPORT ON WiMAX
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ABSTRACT
IEEE 802.16 is the standard to state the radio frequency of fixed Broadband Wireless Access. WiMAX is the trade name of “IEEE 802.16 Standard”. IEEE 802.16 was first planned to offer the last mile for Wireless Metropolitan Area Network (WMAN) with the line of sight (LOS) of 30 – 50 km.
Basically the goal of WIMAX is to provide high speed internet access to home and business subscribers without wires. It supports legacy voice systems, voice over IP, TCP/IP, Application with different QOS requirements. 802.16 consist of the access point, base station and subscriber station. During a communication, all the information coming from a subscriber station go to the base station and retransmitted back to subscriber station. Base station can handle multiple of subscriber station. Two types of links are defined in this:-
• The downlink: From base station to the subscriber station.
• The uplink: From subscriber station to the base station.
Wi-Fi is the most popular and successful broadband wireless IP network standard to date. Popular Wi-Fi standards – like 802.11b and 802.11g – are used in many homes and businesses and enable internet access with high data throughput for computer notebooks, PCs, and more recently, for Smartphone users. 802.11n, the upcoming Wi-Fi standard, (currently in draft state) can double the data throughput of Wi-Fi for heavy demanding applications. A number of cities around the world are in the process of building city-wide Wi-Fi networks to allow citizens to enjoy wireless data transfer across the city (also known as a metropolitan area network). While Wi-Fi operates over a free unlicensed spectrum and is simple to install and operate, it has some major disadvantages. One of the main drawbacks is poor signal coverage; only 30 meters indoors and 200 meters outdoors.
INTRODUCTION
Worldwide Interoperability for Microwave Access, or WiMAX for short, is a next generation open standard that seeks to serve users' increasing demands for high data throughput (broadband) services such as streaming media on the internet, live video conferencing, and mobile TV on computers as well as handsets and PDAs. WiMAX is expected to be integrated into the next generation mass market consumer devices and to offer something that does not exist today – speeds similar to cable and metropolitan area coverage while on the move, all for a much lower cost than we are used to today. WiMAX already offers broadband services in many emerging and rural markets which are not supported by wireline-based technologies and started its first deployment in developed countries replacing both commonly used Wi-Fi on one hand and traditional cellular standards such as 3G.
IEEE 802.16 is the standard to state the radio frequency of fixed Broadband Wireless Access. WiMAX is the trade name of “IEEE 802.16 Standard”. IEEE 802.16 was first planned to offer the last mile for Wireless Metropolitan Area Network (WMAN) with the line of sight (LOS) of 30 – 50 km.
Background
Historically, the main usage of wireless data-transfer was voice communication. As wireless communication standards evolved to become digital (Wi-Fi or GSM), voice has become one among several more bandwidth consuming (broadband) applications such as high definition video or games. Many wireless IP (internet protocol) network standards try to satisfy the increasing demand for more bandwidth in more locations while on the move.
Wi-Fi is the most popular and successful broadband wireless IP network standard to date. Popular Wi-Fi standards – like 802.11b and 802.11g – are used in many homes and businesses and enable internet access with high data throughput for computer notebooks, PCs, and more recently, for Smartphone users. 802.11n, the upcoming Wi-Fi standard, (currently in draft state) can double the data throughput of Wi-Fi for heavy demanding applications. A number of cities around the world are in the process of building city-wide Wi-Fi networks to allow citizens to enjoy wireless data transfer across the city (also known as a metropolitan area network). While Wi-Fi operates over a free unlicensed spectrum and is simple to install and operate, it has some major disadvantages. One of the main drawbacks is poor signal coverage; only 30 meters indoors and 200 meters outdoors. Wi-Fi as a fixed broadband standard cannot support broadband services while on the move and does not support continuous connectivity between Wi-Fi hotspots which could enable, for instance, a person going from his office to a cafe while having a continuous wireless conversation, Wi-Fi is exposed to other interferers on the same band since it runs over an unlicensed spectrum, is considered relatively insecure since it does not use enhanced encryption, is very power inefficient, and does not guarantee quality of service.
What is WiMAX?
WiMAX combines the familiarity of Wi-Fi with the mobility of cellular that will deliver personal mobile broadband that moves with you. It will let you get connected to the Internet, miles from the nearest Wi-Fi hotspot. Soon, Mobile WiMAX will blanket large areas— metropolitan, suburban, or rural—delivering mobile broadband Internet access at speeds similar to existing broadband. WiMAX is built for the future with advanced, efficient wireless technology that provides higher speeds than today’s wide area wireless technologies. It will be able to completely transform your mobile Internet lifestyle, enabling you to connect in ways you’ve only dreamed about.
Comparison with Wi-Fi
Comparisons and confusion between WiMAX and Wi-Fi are frequent because both are related to wireless connectivity and Internet access.
WiMAX is a long range system, covering many kilometers, that uses licensed or unlicensed spectrum to deliver a point-to-point connection to the Internet.
Different 802.16 standards provide different types of access, from portable (similar to a cordless phone) to fixed (an alternative to wired access, where the end user's wireless termination point is fixed in location.)