WiMAX

1
WiMAX

• By
• Omkar KiraniSridhara
• Chaitanya Sannapureddy
• Vivek Gupta

2
Overview

• Introduction
• Definition of WiMAX
• Working of WiMAX
• WiMAX Scenario
• Technical Details
• MAC Layer

• Architecture
• Features
• Benefits
• Limitations
• Uses of WiMAX
• Conclusion

3
Introduction

• THINK ABOUT INTERNET
• A worldwide, publicly accessible series of
  inter-connected computer networks.
• Main uses
• Transmit data
• Communication
• Web applications
• Three ways to access Internet
• Broadband Uses DSL or cable modem
• Dial up Connection Uses modem
• WiFi Uses WiFi routers and hotspots

4
Introduction

• THINK ABOUT WIRELESS ACCESS
• Accessing networks without any wires.
• Convenient and ease of access.
• Ex WiFi
• Low data transfer
• less coverage
• New wireless technology should promise
• High speed
• Broad Coverage

5
Definition of WiMAX

• WiMAX Worldwide Interoperability for Microwave
  Access.
• It is a new telecommunication technology aimed at
  providing wireless data over long distances.
• This wireless technology is designed to provide
  the last mile of high speed internet access as
  well as nomadic service.
• It is based on IEEE 802.16-WirelessMAN

6
WiMAX System consists of
WiMAX TOWER
WiMAX RECEIVER
7
Working of WiMAX
8
Scenario

• Consider a scenario where a WiMAX-enabled
  computer is 10 miles away from the WiMAX base
  station.
• A special encryption code is given to computer to
  gain access to base station
• The base station would beam data from the
  Internet required for computer (at speeds
  potentially higher than today's cable modems)

9
Scenario

• The user would pay the provider monthly fee for
  using the service. Lower cost better speed.
• The WiMAX protocol is designed to accommodate
  several different methods of data transmission,
  one of which is Voice Over Internet Protocol
  (VoIP)
• Almost anyone with a laptop could make VoIP calls

10
Technical Details

• WiMAX is a term coined to describe standard,
  interoperable implementations of IEEE 802.16
  wireless networks.
• Standards
• Range- 30 miles from base station
• Speed- 70 Megabits per second
• Frequency bands- 2 to 11 GHz for licensed band
  and 10 to 66 GHz for unlicensed bands.
• Defines both MAC and Physical (PHY) layer and
  allows multiple PHY layer specifications.

11
MAC layer/ data link layer

• WiMAX uses a scheduling algorithm for which the
  subscriber station need to compete only once for
  initial entry into the network.
• A time slot is allocated to the subscriber by the
  base station.
• The time slot can change but remains assigned to
  the subscriber station
• Stability is achieved by allowing the base
  stations to control QoS parameters by balancing
  the time-slot assignments wrt application needs.

12
Architecture

• Fixed WiMAX has two types of architectures
• Point-to-Point (P2P) Architecture
• Point-to-Multipoint (P2MP) Architecture.

13
Architecture Point-to-point
14
ArchitecturePoint-to-Multipoint
15
Features

• Scalability
• Quality of Service
• Range
• Coverage

16
Advantages

• Speed
• Wireless
• Broad Coverage

17
Uses

• Wi-Fi hotspots can be interconnected without any
  wires.
• It provides a wireless alternative to cable and
  DSL connection for last mile broadband access
• It can provide high-speed data and
  telecommunications services.
• Providing nomadic connectivity.

18
Limitations

• Error rate is increased when operated over
  maximum range and capacity.
• Lower shared bandwidth in case of too many active
  users.
• System up-gradation for current computers is
  required to receive WiMAX transmissions.

19
Future Development

• Long term goal for WiMAX is to achieve 100 MBPS
  mobile and 1 GBPS fixed-nomadic bandwidth.

20
(No Transcript)
21
Conclusion

• Speed, broad coverage, mobility, portability are
  the major concerns for a wireless network.
• WiMAX has all these properties, hence it has the
  potential to substitute 3G and become a promising
  4G.

22
References

• http//en.wikipedia.org/wiki/WiMAX
• students.csci.unt.edu/srj0062/WIMAXf.ppt
• http//standards.ieee.org/getieee802/802.16.html
• http//www.palowireless.com/i802_16/tutorials.asp
• http//www.wimax-industry.com/ar/12y.htm
• http//www.apricot.net/apricot2005/slides/C5-1_3.p
  df
• http//www.wimax-industry.com/wimaxnews.htm
• http//abhi.taralekar.googlepages.com/architecture
  
• http//standards.ieee.org/getieee802/download/802.
  16e-2005.pdf
• http//ezinearticles.com/?WiMAx-VS-Wifiid118819

23
Questions Answers
24
1. Do Service Providers need License to use
Wi-MAX? Justify your answer?

• Yes / No

25
2. Will WiMAX replace DSL and Cable?

• The question of whether or not it could replace
  either DSL or Cable will vary from region to
  region. Many developing countries simply do not
  have the infrastructure to support either cable
  or DSL broadband technologies. In fact, many such
  countries are already widely using proprietary
  broadband wireless technologies. Even in such
  regions however, it is very unlikely that either
  Cable or DSL technologies would disappear. So it
  may be cheaper to deploy Cable and DSL in the
  cities, whereas WiMAX will dominate outside of
  major towns.

26
2. Will WiMAX replace DSL and Cable?

• In US, both Cable and DSL are growing extremely
  fast, but are not available for all customers.
  Rural and remote areas often lack broadband
  choices if any are available at all. When they
  are available, the DSL or cable plant may only
  exist within the town limits with no service
  outside the city limits. This offers a compelling
  argument that low-cost WiMAX gear can leverage
  access to many new customers. WiMAX also promises
  a whole new level of data access flexibility that
  will be much less location specific for customers.

27
3. In WiMAX technology, is it realistic to
provide a service affordable on price and
competitive compared to others? What is the
outlook for the future?

• Same as discussed earlier

28
4. How different is Mobile Wi-MAX from a Fixed
one? Are they compatible, if so How?

• Fixed WiMAX deployments do not cater for handoff
  between Base Stations, therefore the service
  provider cannot offer mobility.
• In contrast handoffs take place between base
  stations offering mobility in mobile WiMAX.
• "Mobile WiMAX" implementations can be used to
  deliver both fixed and mobile services.

29
Thank You !

• Questions ?