Wimax

WIMAX TECHNOLOGYBy

AbhishekMainak

VaibhavAshim

INTRODUCTION

WiMAX (Worldwide Interoperability for Microwave Access) A standards-based technology enabling the delivery of last mile wireless

broadband access as an alternative to cable and DS IEEE 802.16 standard To provide fixed, nomadic, portable and, eventually, mobile

wireless broadband connectivity without the need for direct line-of-sight (LOS) with a base station.

For fixed and portable access applications Up to 40 Mbps per channel, in a cell radius of 3 ~ 10 km

For mobile network deployments up to 15 Mbps per channel, in a cell radius up to 3 km

WiMAX Network: How It Works?

How WiMAX Works

2 forms of wireless service Non-LOS, Wireless LAN sort of service, where a small

antenna on a computer connects to the tower. Uses lower frequency range (2 to 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 upto 66 GHz. Through stronger LOS antennas, WiMAX transmitting stations would send data to WiMAX enabled computers or routers set up within 30 (3,600 square miles of coverage) mile radius.

Two types of connection1. Frequency Division Duplexing2. Time Division Duplexing

Types of Wi-Fi

Standard Throughput Range Frequency

802.11a Up to 54 Mbps Up to 300 ft Between 5 and 6 GHz

802.11b Up to 11Mbps Up to 300 ft 2.4 GHz

802.11g Up to 54 Mbps Up to 300 ft 2.4 GHz

Wireless LAN and WiMAX

WiMAX eliminates the constraints of Wireless LAN.

Unlike Wireless LAN, WiMAX is intended to work outdoors over long distances.

WiMAX is a more complex technology and has to handle issues of importance such as QoS guarantees, carrier-class reliability, NLOS.

WiMAX is not intended to replace Wireless LAN. Instead, the two technologies complement each other.

WiMax Speed & Mobility Ratio

Wi-max Vs Wi-fiWi-max Wi-fi

Range 4-5 miles 300ft

Frequency 70 Mbps 54 Mbps

Speed 2-11 GHz 2-11 GHz

Wiring Tower to Tower Required at Base

Wireless Device ContinuumPri

mary

Cap

ab

ility

Nomadic Portable Tablet Handheld Smart Phone Cell Phone

DATAVOICE

3G802.11 & 802.16

Highest speed processor Processor optimized for low powerLarger display consumption & small form factor

ComparisonWIMAX 3G

Lead to increased broadband penetration. Wimax scores for data

Download speed upto 70 Mbps

Initial cost is low Does not require

significant investment in software and services, because it is inherently open

Easy to compete for the service providers as low initial investment

3G scores for voice Download speed upto

15Mbps Initial cost and

maintenance cost is very high

Require special software and services

No of service providers are limited

WiMAX Applications

According to WiMAX Forum it supports 5 classes of applications:

1. Multi-player Interactive Gaming.2. Video Conference3. Streaming Media4. Web Browsing and Instant Messaging5. Media Content Downloads

WiMAX Advantages in a Nutshell

Robust, reliable carrier class “last-mile” technology with QoS

For many types of high-bandwidth applications at the same time, across long distances

WiMax service providers in India

Tata Communications Internet Services Intel Bharat Sanchar Nigam Ltd Bharti Airtel and Reliance Communications

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