Wimax seminar topic

B.Rajashekar

ByIn charge

Sri. U . Nageshwar rao

DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING

ADAM’S ENGINEERING COLLEGE,PALONCHA-507115. (Accredited by NBA, Approved by AICTE, New Delhi, Affiliated to JNTUH)

A TECHNICAL REPORT ON

WiMAX is an emerging technology for broadband wireless access. It offers both fixed and mobile broadband wireless Internet access. It promises very high data rates, high reliability, good efficiency and low cost. WiMAX enjoys strong industry support and standardization. Because of its low cost, WiMAX can be used to provide broadband Internet access to suburban and rural areas and thus bridge the digital divide.

Abstract

Worldwide Interoperability for Microwave Access.

Introduction

WI MAX

WiMAX standards define formal specifications for deployment of broadband wireless metropolitan area networks (wireless MANs).

Wireless MANs as defined in WiMAX standards provide wireless broadband access anywhere, anytime, and on virtually any device. It is an access technology that promises high data rates and wide coverage at low cost.

WiMAX provides an impressive set of features like coverage radius of up to 50 km, datarates of up to 70 Mbps, ability to work in both licensed and license-exempt spectra and high spectral efficiency.

WiMAX standards enjoy wide support from the industry, which is very crucial for the success of any technology.

WiMAX technology is based on IEEE standard for high layer protocol such as TCP/IP, VoIP, and SIP etc. Wimax network is offering air link interoperability and vendor for roaming. The multi vendor access from Wimax focused on higher level networking specifications for fixed wimax, mobile wimax, and portable wimax. The Architecture of wimax technology based on all IP platforms.

Wimax architecture allowing decoupling and also sustained topologies for connectivity purpose like IEEE 802.16 radio specifics.

Wimax architecture offers various services and applications such as multimedia, Voice, mandated dogmatic services as emergency and lawful interception.

Wimax architecture providing a variety of functions such as ASP, mobile telephony, interface with multi internetworking, media gateway, delivery of IP broadcasting such as MMS , SMS, WAP over IP.

Wimax Architecture

Base station (BS):

The responsibility of Base station (BS) is to provide that the air interface to the MS. The other functionality of BS is micro mobility supervision functions.

Access service network (ASN):

The ASN (Access Service Network) used to describe an expedient way to explain

combination of functional entities and equivalent significance flows connected with the access services.

Connectivity Service Network (CSN) :

Connectivity Service Network (CSN) is a set of functions related to network offering IP services for connectivity to Wimax clients.

A CSN may include network fundamentals such as AAA, server, routers, and user database and gateway devices that support validation for the devices, services and user. The Connectivity Service Network also handled different type of task such as management of IP addresses.

The first WiMAX chip

HOW WIMAX WORKS

In its simplest form, a WiMAX network consists of a WiMAX base station and multiple WiMAX subscriber stations (fixed or mobile). Figure using one fixed subscriber (shown as house) and one mobile subscriber (shown as passenger in a car). WiMAX base station is mounted on a tower. WiMAX subscriber station is a WiMAX customer premise equipment (CPE) that is located inside the house.

WiMAX base station on the tower communicates wirelessly with the WiMAX subscriber station located inside the house.

WiMAX base station on the tower is physically wired to the Internet service provider's (ISP) network through fiber optic cables. At the ISP network terminus, data aggregated from all base stations are sent to the Internet backbone through high-speed high-capacity \thick" fiber-optic cables.

The transmission frequencies of Wimax technology from 2.3MHz to 3.5 GHz make it low price wireless network.

When a user sends data from one location to another the wireless connection is transferred from one cell to another cell. When signal transmit form user to wimax base station or base to user (wimax receiver).

WiMAX is a new wireless technology which provides Mobility, Coverage, Maintainability, Roaming Services etc. Wimax offers both point to point data transformation known as fixed Wimax. It also provide full cellular type mobile data services.

The Wimax family of standards (802.16) concentrate on two types of usage models a fixed wimax usage model and a mobile wimax usage model.

Mobile Wimax :

The 802.16a extension, refined in January 2003, uses a lower frequency of 2 to 11 GHz, enabling NLOS connections. The latest 802.16e task group is capitalizing on the new capabilities this provides by working on developing a specification to enable mobile Wimax clients. These clients will be able to hand off between Wimax base stations, enabling users to roam between service areas.

Wimax backhaul:

Wimax backhaul is actually a connection system from the Access Point (AP) back to the provider and to the connection from the provider to the network.

Wimax Services

WiMAX is a great invention in wireless technology providing 30 miles broadband access to mobile users. Wimax technology based on IEEE 802.16 standard and it is a telecommunication protocol offering full access to mobile internet across cities and countries with a wide range of devices.

Wimax offer high speed of broadband service . Wimax technology is providing

easily scaling of data with possible bandwidth of channel. If the bandwidth of

channels may from 1.25MHz to 10MHz bandwidth.

Wireless rather than wired access, so it would be a lot less expensive than cable or

DSL and much easier to extend to suburban and rural areas .

Broad coverage like the cell phone network instead of small Wi-Fi hotspots.

Wimax Features

Wimax technology applications are a mean of service providers to present data, video, voice, mobile and internet access.

Wimax technology such as it provides simple based prospective cost saving and service efficiency but to be capable to allow VoIP calling, mobile devices, video making and high speed data transfer.

high bandwidth, high quality services, security, and its cost.

Wimax Applications

WiMAX base station Redline Communication’s WiMAX access point

Audio Beam forming device

Limitations of WiMAX Technology

WiMAX is a great technology for next generation with potential applications such as cellular backhaul, hotspot, VoIP mobiles and broadband connection.

The wimax other drawback is that any user closer to the tower can get high speed which is up to 30Mbit/s but if a user exist at the cell edge from the tower can obtain only 14Mbit/s speed.

Bandwidth is shared between users in a specified radio sector. Therefore functionality could go down if more than one user exists in a single sector. Mostly user have a range of 2- to 8 or 12 Mbit/s services so for better result additional radio cards added to the base station to boost the capability as necessary.

Wimax Coverage

The single station of Wimax can operate and provide coverage for hundred of users at a time and manage sending and receiving of data at very high speed with full of network security.

Wimax High Speed

The High speed of connectivity over long distance and high speed voice makes it more demanded in hardly populated areas plus compacted areas.

Advantages

Lack of Quality

The Wimax network has lack of quality service because there are hundreds of people trying to get access at the same tower so due to heavy traffic it is very hard to maintain high quality.

Disadvantages

Data Rate

The data rate of Wimax as compared to other network such as fiber optics, satellite, cables etc are very slow.

Range - 30-mile (50-km) radius from base station

Speed - 70 megabits per second

Line-of-sight not needed between user and base station

Frequency bands - 2 to 11 GHz and 10 to 66 GHz

Wimax Specifications

The basic difference between Wimax technology and Wi-Fi technology are cost, speed, distance and so on. Wimax coverage is about 30 miles and Wi-Fi coverage is very limited to some small area.

Wimax network just as an ISP without any cable because Wimax signal used to get access to internet to your home or business, while Wi-Fi will be used inside in your local area network (LAN) for access to the internet.

The Wimax architecture is design to make possible metropolitan area networking (MAN). The base station of Wimax capable to provide access to business and hundred of homes, While Wi-Fi is providing only local area networking (LAN).

WiMAX vs Wi-Fi

Framework for the evolution of wireless broadband.

Everything will be coordinated with Wimax .

WiMAX with all its challenges and opportunities is an unavoidable part of our future.

WiMAX has the potential to be a true business enabler.

The Possibilities with this technology are immense and numerous.

It will lead to great advance of commercial field. Even though it could face stiff competition from 3G technologies and metropolitan-scale deployments of Wi-Fi networks, WiMAX seems to have the necessary tech- technical capabilities and industry support to be a Success.

Conclusion

Thank You