Wimax

WIMAX

PRESENTED BY-

SHAKIL MUHAMMAD

UET PESHAWAR

Contents

Introduction

Working of WIMAX

Features of WIMAX

Advantages of WIMAX over WIFI

Future of WIMAX

What is WIMAX?

WIMAX stands for Worldwide Interoperability for Microwave Access

WiMAX refers to broadband wireless networks that are based on the IEEE 802.16 standard, which ensures compatibility and interoperability between broadband wireless access equipment

primarily aimed

To get rid of expense of stringing wires (as in cable-access broadband)

and the distance limitations of Digital Subscriber Line

Wide availability of network access

NEW TECHNOLOGY

Broadband access is too expensive and WiFi coverage is very sparse.

The new technology promises

High speed of broadband service

Wireless rather than wired access

Broad Coverage

1) A WiMAX tower- similar in concept to a cell-phone tower .it transmits signals and gives coverage to a very large area

2) A WiMAX receiver - The receiver and antenna could be a small box or Personal Computer Memory card, or they could be built into a laptop the way WiFi access is.

A WIMAX system consists of

WIMAX TOWER WIMAX RECEIVER

HOW WIMAX works?

WIMAX CHIPS

FEATURES OF WIMAX

Scalability

Quality of Service

Range

Coverage

Scalability

The 802.16 standard supports flexible radio frequency (RF) channel bandwidths.

The standard supports hundreds or even thousands of users within one RF channel

As the number of subscribers grow , the spectrum can be reallocated with process of sectoring.

Quality of Service

Primary purpose of QoS feature is to define transmission ordering and scheduling on the air interface

These features often need to work in conjunction with mechanisms beyond the air interface in order to provide end to end QoS or to police the behaviour.

RANGE

Optimized for up to 50 Km

Designed to handle many users spread out over kilometres

Designed to tolerate greater multi-path delay spread (signal reflections) up to 10.0μ seconds

Coverage

Standard supports mesh network topology

Optimized for outdoor performance

Standard supports advanced antenna techniques

BENEFITS OF WIMAX

Speed

Faster than broadband service

Wireless

Not having to lay cables reduces cost

Easier to extend

Broad Coverage

Much wider coverage than WiFi hotspots

Benefits to Customers

DSL-like services at DSL prices but with portability

Rapidly declining fixed broadband prices

No more DSL “installation” fees from incumbent

Why not WIFI

Scalability

Relative Performance

Quality of Service

Range

Coverage

Security

Scalability

• Channel bandwidths can be

chosen by operator (e.g. for

sectorization)

• designed to support thousands

of users.

• Wide (20MHz) frequency

channels

• designed to support 10’s of

users

WIMAXWIFI

5.0 bps/Hz100 Mbps1.5 – 20 MHzWIMAX

2.7 bps/Hz54 Mbps20 MHzWIFI

Maximum

bps/Hz

Maximum

Data Rate

Channel

Bandwidth

RELATIVE PERFORMANCE

Quality of Service

• Designed to support Voice and

Video from ground up

• Supports differentiated service

levels: e.g. T1 for business

customers; best effort for

residential.

• Standard cannot currently

guarantee latency for Voice, Video

• Standard does not allow for

differentiated levels of service on a

per-user basis

•

WIMAXWIFI

Range

• Optimized for up to 50 Km

• Designed to handle many users

spread out over kilometers

• Designed to tolerate greater

multi-path delay spread (signal

reflections) up to 10.0μ seconds

• Optimized for ~100 meters

• No “near-far” compensation

• Designed to handle indoor multi-

path delay spread of 0.8μ seconds

WIMAXWIFI

Coverage

• Optimized for outdoor

performance

• Standard supports mesh network

topology

• Standard supports advanced

antenna techniques

• Optimized for indoor

performance

• No mesh topology support within

ratified standards

WIMAXWIFI

USES OF WIMAX

FUTURE

WiMax will be deployed in three stages

In the first phase provides fixed wireless connections

In the second phase WiMaX will be available as a cheap and self-installing Subscriber Terminal (ST), linked to PC and to antenna

The third phase enables portability, thus WiMAX will be integrated into commercial laptops

Any question?