WiMAXPresented ByCh.Srinivas Koundinya118T1A0435

Internet ConnectionsThree traditional ways 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.

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.

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.

Architecture of WiMAX

A WiMAX 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.

ISP Network

Internet Backbone

WiMAX 802.16

Transmitter

Line of Sight

Backhaul

Non Line of Sight Transmission

Home Local Area Network

Comparison with other Wireless Technologies

Maximum Speed Supported

• WiMAX 802.16 - 280Mbps

• 3G - up to 2 Mbps

• Wi-Fi - up to 600 Mbps

• Mobile-Fi -- up to 80 Mbps

Coverage Area• WiMAX 802.16a/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

Airwave• 3G and Mobile-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.

Quality of Service

WiMAX 802.16

• 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

Bandwidth WiMAX

802.16 - 20-28 MHz802.16a/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.

ScalabilityFor 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.

Advantages

• WiMAX 802.16 is surely an advanced technology when compared with the other technologies with more Bandwidth Bit rate Coverage area Performance Quality of service and secure too.

Disadvantages

• Interference with Bluetooth 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

Present research work on 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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