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Wi-Fi and Wi-max

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Wi-Fi and WiMax Presented By, S.J. VIT University, Chennai.
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Page 1: Wi-Fi and Wi-max

Wi-Fi and WiMax

Presented By,S.J.

VIT University, Chennai.

Page 2: Wi-Fi and Wi-max

Both the technology

- work on wireless networks.- have their own standards specified by IEEE.

The evolution of wireless LAN started with the introduction of the 802.11b standard in 1999.

In the same year, the 802.11a started introduced the Orthogonal Frequency Division Multiplexing (OFDM).

In 2003, "the best" of both standards were joined to the 802.11g standard

Wi-MAX was standardized as 802.16 by Wi-MAX forum, in 2001.

Standard’s Overview

Page 3: Wi-Fi and Wi-max

Wi-Fi is wireless networking technology that uses

radio waves to provide wireless high-speed Internet and network connections.

A common misconception is that the term Wi-Fi is short for "wireless fidelity," however this is not the case. Wi-Fi is simply a trademarked phrase that means IEEE 802.11x.

It is wireless LAN technology which provides narrow range of connectivity.

Establishes a standard for interoperability and backward compatibility.

Wi-Fi Overview

Page 4: Wi-Fi and Wi-max

Wi-Fi technology used ratio technologies that

transmits and receive data at high speed. Standards specified by IEEE.

•IEEE 802.11b•IEEE 802.11a

•IEEE 802.11g•IEEE 802.11n

Wi-Fi’s-IEEE standard

Page 5: Wi-Fi and Wi-max

Comparison of Wi-Fi

Standards

Page 6: Wi-Fi and Wi-max

Introduced in 2009. Improve network throughput over 802.11a and

802.11g 300 Mbps speed. Multi input and multiple output (MIMO) added. 40MHz channel to the PHY, and frame

aggregation to the MAC layer. 2.4/5GHz radio frequencies.

IEEE 802.11n

Page 7: Wi-Fi and Wi-max

AP based technology (Infrastructure mode)

Peer-to-Peer technology (Ad-Hoc mode)

Point-to-Multipoint Bridge topology.

Wi-Fi Network Architecture

Page 8: Wi-Fi and Wi-max

Wi-Fi setup contains one or more

access point and client AP broadcasts SSID via beacons, every 100ms. Beacons transmitted at 1Mbps. Client can communicate at least at 1Mbps. Connections to AP(same SSID) is decided on basis

of signal strength. Connection criteria and roaming is open to client. Wi-Fi has same properties as that of non switched

Ethernet network.

How Wi-Fi Works?

Page 9: Wi-Fi and Wi-max

There are two signaling frequencies currently used by Wi-Fi

networks: 2.4 GHz - Comprises of

- 14 channels - bandwidth 20 to 22 MHz (ISM band)- Bluetooth, microwaves, telephones, garage door openers,

etc. 5 GHz - Comprises of

- 13 channels- bandwidth 20 MHz (U-NII band)- Less crowded as compared to 2.4GHz.

The "Wi-Fi CERTIFIED" trademark can only be used by Wi-Fi products range of about 20 meters in indoor and greater at outdoor. It uses WEP, WPA, WPA2

Salient Features

Page 10: Wi-Fi and Wi-max

Convenience Mobility Productivity Deployment Expandability Cost

Advantages

Page 11: Wi-Fi and Wi-max

Security Range Reliability Speed

Disadvantages

Page 12: Wi-Fi and Wi-max

WIMAX is an IP based, wireless broadband access

technology that provides performance similar to 802.11/Wi-Fi networks with the coverage and QOS of cellular networks.

WI-MAX refers to “Worldwide Interoperability for Microwave Access”.

It is wireless MAN technology which provides broadband range of connectivity.

A standard based technology that enable the delivery of last mile wireless broadband access as an alternative to cable and DSL

Establishes standard that provides fixed and mobile Internet Access.

Wi-MAX Overview

Page 13: Wi-Fi and Wi-max

Standards specified by IEEE.

•IEEE 802.16•IEEE 802.16a

•IEEE 802.16e

Wi-MAX’s-IEEE standards

Page 14: Wi-Fi and Wi-max

Comparison of Wi-MAX

standards

Page 15: Wi-Fi and Wi-max

Wi-MAX Architecture

Page 16: Wi-Fi and Wi-max

When a user send data from a subscriber device to a base station then

that base station broadcast the wireless signal into channel which is called uplink and base station transmit the same or another user is called downlink.

The base station of WiMAX has higher broadcasting power, antennas and enhanced additional algorithms.

When signal transmit form user to WiMAX base station or base to user (WiMAX receiver) the wireless channel faces many attenuation such as fraction, reflection, refraction, wall obstruction etc.

OFDMA that prohibit interfering and be multiplexed also makes possible power prioritization for various sub carriers according to the link quality.

WiMAX is providing quality of service (WiMAX QoS) which enables high quality of data like VoIP or TV broadcasts.

WiMAX technology support various protocol such as VLAN, ATM, IPv4 Ethernet etc.

How Wi-MAX works

Page 17: Wi-Fi and Wi-max

Two forms of wireless services

Non line of Sight. Line of Sight.

OFDM based physical layer Very high field data rates-74Mbps Scalable bandwidth(1.25,5,10MHz) and data rate Adaptive modulation and coding. Link Layer retransmission. Robust Security. Support for advance antenna techniques

Salient Features

Page 18: Wi-Fi and Wi-max

Single station can serve hundreds of users. Much faster deployment of new users

comparing to wired networks. Speed of 10 Mbps at 10 kilometers with line-

of-site. It is standardized, and same frequency

equipment should work together.

Advantages

Page 19: Wi-Fi and Wi-max

Line of site is needed for longer connections Weather conditions like rain could interrupt

the signal. 0ther wireless equipment could cause

interference. Multiplied frequencies are used. WiMAX is very power intensive technology and

requires strong electrical support. Big installation and operational coast.

Disadvantages

Page 20: Wi-Fi and Wi-max

Yota is the largest WiMAX network operator in the

world. By the end of 2008 there were 350,000 WiMAX

subscribers in Korea. As of October 2010, the WiMAX Forum claimed

over 592 WiMAX networks deployed in over 148 countries, covering over 621 million subscribers.

By February 2011, the WiMAX Forum cited coverage of over 823 million people, and estimate over 1 billion subscribers by the end of the year.

Current Deployments

Page 21: Wi-Fi and Wi-max

Comparison Between Wi-Fi and WiMAX

Page 22: Wi-Fi and Wi-max

THANK YOU


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