Wi max by pankaj jangid

INTRODUCTION
 Think about how you access the internet today.
 There are basically three different options:
 BROADBAND ACCESS
 WIFI ACCESS
 DIAL-UP ACCESS

 The main problems with broadband access are
that it is pretty expensive & it doesn’t reach all
areas.

 The main problem with WIFI is that hot spots are
very small, so coverage is sparse.

What if there were a new technology
that solved all of these problems?
This new Technology would provide:-

 High speed of broadband service
 Wireless rather than wired access
 That is less expensive than cable
 Much easier to extend to rural areas
 Broad coverage like cell phone networks.

Before WIMAX <---wi-fi
^
|
|
Infrared-Bluetooth
^
|
|
Cables -Optical Fiber

  

WHAT IS WIMAX?
 Worldwide Interoperability for Microwave Access.
 WIMAX is a wireless digital communications system also
known as IEEE 802.16.
 WiMAX was seen as more of a Metropolitan Area
Network (MAN) technology providing a much larger
coverage.
 WIMAX can provide broadband wireless access up to 30
miles(50 km) for fixed stations and 3-10 miles(5-15 km)
for mobile stations.
 Next generation of wi-fi.
 Wi- max is the fast emerging wide area wireless broad
band technology.

Why is it Interesting?
 Promise of potential low cost and flexibility in building
broadband networks.
 Scalability, as extra channels and base stations can be
added incrementally as bandwidth demand grows.
 Support for both voice and video as well as Internet
data.
 Broad Coverage
 High speed up to 70 Mb/sec.

How WIMAX Works?

 A WIMAX 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.

 This connection to a second tower, along with the ability of a
single tower to cover up to 3,000 square miles, is what
allows WIMAX to provide coverage to remote rural areas.

WiMAX Architecture

MIB – Management Information Base

WiMax can provide 2 forms of wireless service:

 Non-LOS, where a small antenna on your computer
connects to the tower in the low frequency range of 2-11
GHz.
 LOS, where a fixed antenna points straight at the WiMax
tower from a rooftop or pole. The LOS connection is
stronger and more stable, so it is able to send a lot of data
with fewer errors. Uses higher frequencies, with ranges
reaching a possible 66 GHz.
 Through stronger LOS antennas, WiMax transmitting
stations would send data to WiMax enabled computers or
routers set up within 30 mile radius.

TYPES OF WIMAX
FIXED WIMAX:
Wireless access application in which the location of the end-
user termination and the network access point to be connected
to the end-user are fixed.

MOBILE WIMAX:
Mobile WIMAX implementations can be used to deliver both
fixed & mobile services It offers superior building penetration
and improved security.

Characteristics of WiMax
Frequency Ranges
 10 - 66 GHz
 Short wavelength
 Line-of-sight (LOS) required
 Negligible multipath

 2 – 11 GHz
 Longer wavelength
 Improved range and in-building penetration
 LOS not required
 Multipath effects may be significant

 Cost Effective
 There are areas of the world-especially in rural areas-
where deploying wired broadband infrastructure is not
cost effective.
 In this case WIMAX is very cost effective.

 High speed of Broadband service
 Another benefit of WIMAX is the ability to get a higher
connection speeds farther away from the transmitter.

Wi-Fi

 Stands for Wireless Fidelity.
 Brand licensed by the Wi-Fi Alliance.
 Wi-Fi is a local area network technology that was
originally thought to replace the thousands of miles of
LAN cables.
 Wireless Local Area Networks (WLAN)
 Based on IEEE 802.11

Difference Between WiMAX and Wi-Fi
 Range:
802.11 802.16
 Optimized for ~100 meters  Optimized for up to 50 Km

 No “near-far” compensation.  Designed to handle many users
spread out over kilometers
 Designed to handle indoor multi-
path(delay spread of 0.8μ  Designed to tolerate greater
seconds). multi-path delay spread (signal
reflections) up to 10.0μ seconds
 Optimization centers around PHY
and MAC layer for 100m range.  PHY and MAC designed with multi-
mile range in mind
 Range can be extended by
cranking up the power – but MAC  StandardMAC;Sectoring/MIMO/AMC
may be non-standard. for Rate/Range dynamic tradeoff

Bit Rate: Relative Performance

Channel Maximum Maximum
Bandwidth Data Rate bps/Hz

802.11a 20 MHz 54 Mbps ~2.7 bps/Hz

10, 20 MHz;
802.16a 1.75, 3.5, 7, 14 MHz; 63 Mbps* ~5.0 bps/Hz
3, 6 MHz

802.16a is designed for metropolitan performance

Coverage
802.11 802.16
 Optimized for indoor performance  Optimized for outdoor NLOS
performance
 Standard supports mesh network
topology
 No mesh topology support within
ratified standards  Standard supports advanced antenna
techniques

802.16 is designed for market coverage

Will WiMAX displace WiFi?
 WiMAX will not replace WiFi
completely, but work
TOGETHER
 Intel is currently integrating
WiMAX and WiFi into a single
Centrino chip.
 WiFi’s primary role will always
be autonomous hotspot
service
 areas (indoor and outdoor 0 ft.
< cell radii <500 ft.).
 WiMax will ultimately replace
WiFi in large-scale in
commercial and public roles.

Wi-fi and WiMax Together

22

ADVANTAGES OF WIMAX

 Wimax Coverage
 Wimax High Speed
 Multi-functionality within Wimax Technology
 Potential and development
 Stay in touch with end user
 Wimax Infrastructure
 Wimax, cheap network
 Wimax Rich Features
 Wimax and Wifi
 Smart antenna and Mesh Topology

DISADVANTAGES
 Lack of Quality
 WiMAX range
 WiMAX Bandwidth
 WiMAX rich features
 Bad Weather
 Wireless equipments
 Power consuming
 Data Rate

FUTURE
 Anywhere, Anytime, Connectivity

 WIMAX offers the kind of service where you can get a
connection, wherever u may be.

 When WIMAX is fully developed, u will no longer be
limited to 300 feet within the WIFI hotspot, & u won’t
have to drive around looking for a connection….

CONCLUSION

 WiMAX could bring broadband access into the homes
and businesses of millions of people in rural and
developing markets.

 Portable Internet a reality

 End-users to enjoy an “Always Best Connected”

Wi max by pankaj jangid

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