ByOmkar KiraniSridhara

Chaitanya Sannapureddy

Vivek Gupta1

Introduction Definition of

WiMAX Working of WiMAX WiMAX Scenario Technical Details MAC Layer

Architecture Features Benefits Limitations Uses of WiMAX Conclusion

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THINK ABOUT INTERNETA 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

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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

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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

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WiMAX TOWER WiMAX RECEIVER

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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)

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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

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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.

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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.

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Fixed WiMAX has two types of architectures:

◦Point-to-Point (P2P) Architecture

◦Point-to-Multipoint (P2MP) Architecture.

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ScalabilityQuality of ServiceRangeCoverage

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SpeedWirelessBroad Coverage

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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.

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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.

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

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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.

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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.pdf 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-Wifi&id=118819

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Yes / No

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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.

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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.

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Same as discussed earlier…

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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.

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Questions ?

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