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WiMAX
WiMAX, or IEEE 802.16, is a wireless communication standard designed for metropolitan area networks, capable of covering areas up to 3,000 square miles with speeds up to 280 Mbps. It offers advantages over traditional internet connections such as dial-up, broadband, and Wi-Fi, including improved bandwidth, bit rate, and quality of service, though it has challenges like high equipment costs and power consumption. Current research aims to enhance WiMAX technology with WiMAX2, targeting speeds of 100 Mbps for mobile devices and 1 Gbps for fixed devices.
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WiMAX
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- 2. Internet Connections Three traditionalways to connect Internet: 1)Dial-up access – It is an Internet connection that will be established by using a modem which act as data transfer medium when user initiates dial up connection. 2)Broadband access -This refers to high-speed data transmission in which a single cable(DSL,cable modem) can carry a large amount of data at once. 3)WiFi access - Wi-Fi refers to wireless networking technology that allows computers and other devices to communicate over a wireless signal.
- 3. IEEE 802.16 Specifications •Range - 30-mile (50-km) radius from base station • Speed - 70 megabits per second • Line-of-sight not needed between user and base station • Frequency bands - 2 to 11 GHz and 10 to 66 GHz (licensed and unlicensed bands) • Defines both the MAC and PHY layers and allows multiple PHY-layer specifications. Visit www.seminarlinks.blogspot.com to download
- 4. What is WiMAX? • WiMAX is short for “Worldwide Interoperability for Microwave Access” • WiMAX is technically also known as “IEEE 802.16” • WiMAX is a wireless communications standard designed for creating Metropolitan Area Networks(MANs). • It is similar to the Wi-Fi standard, but it can broadcast as big as 3,000 square miles.
- 5. Architecture of WiMAX AWiMAX system consists of two parts: • WiMAX receiver: The receiver could be a small box or PCMCIA card, or they could be built into a laptop the way Wi-Fi access is today. • WiMAX tower: It can provide cover to a very large area as big as 3,000 square miles.
- 7. ISP Network Internet Backbone WiMAX 802.16 Transmitter HomeLocal Area Network Visit www.seminarlinks.blogspot.com to download
- 8. Wi-MAX Type 802.16802.16a/Rev d 802.16e Completed Dec 2001 802.16a Jan 2003 802.16 Rev d June 2004 Mid 2005 Spectrum 10 – 66 GHz 2 – 11 GHz 2 – 6 GHz Application Backhaul Wireless DSL and Backhaul Mobile Internet Channel Conditions Line of Sight only Non – Line of sight Non – Line of Sight Bit rate 32 – 134 Mbps at 28 MHz channelization Up to 75 Mbps at 20 MHz channelization Up to 15 Mbps at 5 MHz channelization Modulation QPSK 16 QAM and 64 QAM OFDM 256 sub carriers QPSK 16 QAM and 64 QAM Scalable OFDMA Mobility Fixed Fixed Pedestrian Mobility / Regional roaming Channel Bandwidth 20, 25 and 28 MHz Selectable channel between 1.5 and 20MHz Same as 802.16a with UL sub channels to conserve power Typical Cell Radius 1 – 3 miles. 4 – 6 miles. Maximum range 30 Miles based on tower height, antenna gain and power transmit. 1 – 3 Miles
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- 10. Maximum Speed Supported •WiMAX 802.16 - 280Mbps • 3G - up to 2 Mbps • Wi-Fi - up to 600 Mbps • Mobile-Fi -- up to 80 Mbps
- 11. Coverage Area • WiMAX802.16a/Rev d - 30 Miles Max • WiMAX 802.16 - 1 – 3 Miles • WiMAX 802.16e - 1-3 Miles. • 3G and Mobile-Fi - 5 Miles • Wi-Fi 802.11 - 300 feet • Wi-Fi router - 30 Feet
- 12. Airwave • 3G andMobile-Fi 802.20 are the licensed ones • WiMAX 802.16 can be either Licensed or Unlicensed • Wi-Fi 802.11 is an unlicensed one. Channel Condition • The WiMAX 802.16, 3G and Wi-Mobile 802.20 is optimized for Outdoor Non- Line of Sight • Wi-Fi 802.11 is Line of Sight based.
- 13. Quality of Service WiMAX802.16 • Grant request MAC • Designed to support voice and video from the start • supports differentiated service levels and centrally enforced QoS Wi-Fi 802.11 • Contention – based MAC • No guaranteed QoS • Standard Cannot guarantee latency for voice or video • No allowance for differential levels of service on a per user basis • Proposed 802.11e QoS standard is prioritization only
- 14. Bandwidth WiMAX 802.16 -20-28 MHz 802.16a/Rev d - 1.5 -210MHz 802.16e - 3.6MHz Wi-Fi 802.11 - 20MHz Wi-MAX 802.165 supports Maximum 5.0 bps/Hz Wi-Fi 802.11 Supports only up to a maximum 2.7 bps/Hz.
- 15. Scalability For WiMAX 802.16 •the channel bandwidths can be chosen by the operator for the sectorization and scalable independent of bandwidth with 1.5MHz to 20MHz width channels • MAC also supports thousands of users where as Wi-Fi 802.11 has only wide 20MHZ channels and MAC only supports tens of users.
- 16. Advantages • WiMAX 802.16is surely an advanced technology when compared with the other technologies with more Bandwidth Bit rate Coverage area Performance Quality of service and secure too.
- 17. Disadvantages • Interference withBluetooth wireless communication • The cost of equipment is really high and it has not yet widely used. • Power-consuming technology • High installation • Signal interruption in bad weather
- 18. Present research workon WiMAX • WiMAX2 is the present ongoing development in the WiMAX versions. • That is to increase the speed of existing WiMAX network. • Currently existing WiMAX versions provides minimum of 30 to 40 megabits per second of speed. • But the goal of the WiMAX2 is to get 100 Mbit/s for mobile devices and 1 Giga bits per second fixed type of WiMAX devices and 4G for next generation mobile network.
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