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WIMAX

WiMAX (Worldwide Interoperability forMicrowave Access) is a technology that

focuses on providing data over long distancesin a wireless mode, very similar to the cellularmobile concept. WiMAX is capable of offeringspeeds up to 2 Mbps, which is approximately

25 times faster than the regular dial-upconnection and unlike a dial-up, a WiMAXconnection is switched on from the momentyou start your pc

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WIMAX

WIMAX (Worldwide Interoperability for Microwave Access ): Protocol of communication network without wire, based

on the standard IEEE 802.16

Allows communications over long distances than WiFi,

and a greater bandwidth. Cover approximately 40km.

Field of application:

Better price points for both home and business

customers.

WIMAX allow competitors joint access to any subscriberin areas without preexisting physical cable or telephone

networks

would allow gamers access to ad hoc local networks of

other players with the same gear- without any internet

access.

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WWAN802.20 (proposed)

IEEE Standards View of Wireless Network

Technologies

MAN70 Mbps

~50 Km

802.16a/e

WiMAXNew standard forFixed broadband

Wireless. Trying to dofor MAN what Wi-Fidid for LAN.

WLAN11-54 Mbps

~100m802.11a/b/g

Wi-Fi

Includes 802.11a/b/g.Products must beApproved for

Interoperability by theWi-Fi Alliance.PAN

~1.5 Mbps

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WIMAX

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Introduction

Goal of WIMAX:Provide high-speed Internet access to home and

business subscribers, without wires.

Frequency range:10-66 GHz and sub 11 GHz

Supports: Legacy voice systems

Voice over IP TCP/IP

Applications with different QoS requirements.

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Introduction

During a communication, all the information

coming from a SS go to the BS and are

retransmit to the right SS.

Base stations (BS) can handle thousands of

subscriber stations (SS).

Two type of link are defined:

The downlink: From the BS to the SS.

The uplink: From the SS to the BS.

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Introduction

Infrastructure of WIMAX

A WIMAX tower: similar in concept to a cell-phone

tower. A single WIMAX tower can provide coverage

to a very large area (~8,000 km).

A WIMAX receiver : The receiver and antenna could

be a small box or PCMCIA card, or could be built into

a laptop.

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Introduction

A WIMAX tower An example of WIMAX receiver

: PCMCIA card

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WiMAX System Parts

WiMAX tower

Similar in concept to a cell-phone tower

Can provide coverage to a very large area -- as big

as 3,000 square miles

A WiMAX receiver

The receiver and antenna could be a small

box or PCMCIA card, or they could be builtinto a laptop the way WiFi access is today

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WiMAX System Parts

A tower station can connect directly to the

Internet using a high-bandwidth, wired

connection

It can also connect to another WiMAX

tower using a line-of-sight, microwave link.

Often referred to as a backhaul

Allows WiMAX to provide coverage to remote

rural areas.

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Two forms of wireless service

Non-line-of-sight

A small antenna on your computer connects

to the tower

2 GHz to 11 GHz frequency range

Limited to a 4-to-6 mile radius

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Two forms of wireless service

Line-of-sight service

A fixed dish antenna points straight at the

WiMAX tower from a rooftop or pole.

66 GHz frequency range

Higher frequencies, there is less interference

and lots more bandwidth

30-mile radius

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Specifications

Range

30-mile radius from base station

Speed 70 megabits per second

Line-of-sight not needed between user

and base station

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In practical terms, WiMAX would operate

similar to WiFi but at higher speeds, over

greater distances and for a greater

number of users.

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WiFi hotspot replacement

Cities might pay to have WiMAX basestations set up in key areas for businessand commerce and then allow people to

use them for free. Similar to free WiFi hotspots, but wider range

Some companies might set up WiMAX

transmitters and then make people pay foraccess.

Similar to paid WiFi hotspots, but wider range

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Evolution of Wireless Standards

The Wi-Fi Alliance is a nonprofit internationalassociation formed to certify interoperability ofWLAN products based on IEEE 802.11 specification.http://www.wi-fi.org

The WiMAX Forum is a non-profit corporation with agoal of promoting deployment of broadband wirelessaccess networks. Forum member companiessupport the industry-wide acceptance of the IEEE802.16 standard. http://www.wimaxforum.org

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WiMax VS. WiFi

WiMAX should be able to handle up to

70Mbps

The biggest difference isn't speed!!

WiFi's range is about 100 feet (30 m)

WiMAX range is about 30 miles (50 km) with

wireless access

WiMAX(10-66 GHz frequency)

WiFi(5GHz frequency maximum)

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Comparison betweenWi-Fi & WiMAX(IEEE 802.11 & IEEE 802.16a)

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Scalability

802.11 802.16a

Wide (20MHz) frequency

channels

MAC designed to support

10s of users

1.5 MHz to 20 MHz width

channels. Channel

bandwidths can be chosenby operator

MAC designed to support

thousands of users.

802.16a is designed for subscriber density

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Relative Performance

Channel

Bandwidth

Maximum

Data Rate

802.11

802.16a

20 MHz 54 Mbps

Selectable channel

bandwidths

between 1.25 and

20 MHz

70 Mbps*

*Assuming a 14 MHz channel

802.16a is designed for metropolitan performance

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Disadvantages of WiMAX

Line-of-sight (LOS) is required for long distance (5-30mile) connections

Certain conditions terrain, weather and large

buildingscan act to reduce the maximum range

Other wireless electronics can interfere with the WiMAXconnection & cause a reduction in data throughput

licensed airwave frequencies are limited availability.

Unlicensed airwaves are free but all can use them

difficult to control service quality as other users of thesame band could cause interference

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Advantages of WiMAX

Full support for WMAN service

Improved user connectivity

Longer Ranges

High Throughput Higher Quality of Service (QoS)

Ensures Interoperability

Line of sight not required

802.16e version allows for Mobility Easy Installation

lower cost CPE

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Wimax in Pakistan

Two wimax provider in pakistan

Mobilink infinity

Wateen telecom

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Wireless architecture: point-

to-point and point-to-

multipoint

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Point-to-Point(P2P)

Point to point is used where there are two points

of interest: one sender and one receiver. This isalso a scenario for backhaul or the transport from

the data source (data center, co-lo facility, fiber

POP, Central Office, etc) to the subscriber or fora point for distribution using point to multipoint

architecture. Backhaul radios comprise an

industry of their own within the wireless industry.

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WIMAX ANTENNEA

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WIMAX ANTENNEA

WiMAX antennas, just like the

antennas for car radio, cell phone,FM radio, or TV, are designed to

optimize performance for a given

application.

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Omni Directional Antenna

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Omni Directional Antenna

An omni-directional antenna broadcasts

360 degrees from the base station

Omni directional antennas are used forpoint-to-multipoint configurations. The

main drawback to an omni directional

antenna is that its energy is greatly

diffused in broad-casting 360 degrees

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Sector Antennas

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Sector Antennas

Sector antennas are focused on smaller

sectors

A sector antenna, by focusing the beam in

a more focused area, offers greater range

and throughput with less energy.

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Panel Antennas

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Panel Antennas

Panel antennas are most often used for

point-to-point applications

Panel antennas are usually a flat panel ofabout one foot square. They can also be a

configuration where potentially the WiMAX

radio is contained in the square antenna

enclosure.

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CONCLUSION

WiMAX is defined as Worldwide Interoperability forMicrowave

Access by the WiMAX Forum, formed in April 2001 to promote

conformance and interoperability of the standard IEEE

80

2.16.The Forum describes WiMAX as "a standards-based

technology enabling the delivery of last mile wireless

broadband access as an alternative to cable and DSL'.

With WiMAX, WiFi-like data rates are easily supported, but the

issue of interference is lessened. WiMAX operates on bothlicensed and non-licensed frequencies, providing a regulated

environment.

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