PPT on Wi-fi, WLAN, UMTS

7/30/2019 PPT on Wi-fi, WLAN, UMTS

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SEMINAR ONWI-FI , WLAN AND UMTS

Presented By:

Hemant Kumar(1705433)


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What is Wi-Fi? Wi-Fi i.e. Wireless Fidelity is a wireless

technology that uses radio frequency to transmit

data through the air.

Wi-Fi refers to a type of Ethernet specified underthe IEEE 802.11a and IEEE 802.11b Standards

operating in the 5-and 2.4-GHz frequency bands

respectively.


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History

IEEE established the 802.11 Group in 1990.

Initial speeds were 1 and 2 Mbps

IEEE modified the standard in 1999 to include

802.11 a and b

802.11g was added in 2003

802.11b equipment was first available, thena,followed by g


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Why Wi-Fi?

Setup CostReduced cabling required

FlexibilityQuick and easy to setup in

temprorary or permanent space

FreedomYou can work from any location that

you can get a signal

The current version ofWi-Fi Protected Accessencryption (WPA2) is not easily defeated

Mobile UsersCan access the Corporate network

from any public hotspot
http://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Access


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Disadvantages

It is prone to interference from other devices

(microwave ovens, cordless phones, etc) and

also has security disadvantages It limits to the number ofaccess points in range

of each other

Spectrum assignments and operationallimitations are not consistent worldwide

There is no physical barrier to the interception

of the signals


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Future Scope

The 802.11a Wi-Fi standard is expected to replace

the current 802.11b.

802.11a units offer throughput thats five to tentimes faster than todays Wi-Fi

Frequency band is free of interference from

HomeRF, microwave ovens, cordless phones andother gear that can impede communications in the

current 2.4GHz band.


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What is WLAN?

A wireless local area network (LAN) is a

flexible data communications system

implemented as an extension to, or as analternative for, a wired LAN.

Using radio frequency (RF) technology,

wireless LANs transmit and receive dataover the air, minimizing the need for wired

connections.


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Why Wireless LAN?

With public wireless networks, users can access

the internet even outside their normal work

environment Users connected to a wireless network can

maintain a nearly constant affiliation with their

desired network as they move from place to place

Wireless networks can serve a suddenly-increased

number of clients with the existing equipment.

Savings in cost


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Disadvantages

Small Range use of repeators increase cost

Less Security because of no physical Barrier

Like any radio frequency transmission, wireless

networking signals are subject to a wide variety of

interferennce

The speed on most wireless networks (typically 1-108 Mbit/s) is reasonably slow compared to the

slowest common wired networks (100 Mbit/s up

to several Gbit/s).


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What is UMTS?

Universal Mobile Telecommunications System

(UMTS) is one of the third-generation

(3G)mobile telecommunications technologies,which is also being developed into

a 4G technology.

The most common form of UMTS uses W-

CDMA as the underlying air interface.

UMTS, using W-CDMA, supports up to

21 Mbit/s data transfer rates
http://en.wikipedia.org/wiki/3Ghttp://en.wikipedia.org/wiki/Mobile_telecommunicationshttp://en.wikipedia.org/wiki/4Ghttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/Air_interfacehttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/Mbit/shttp://en.wikipedia.org/wiki/Data_transfer_ratehttp://en.wikipedia.org/wiki/Data_transfer_ratehttp://en.wikipedia.org/wiki/Mbit/shttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/Air_interfacehttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/W-CDMAhttp://en.wikipedia.org/wiki/4Ghttp://en.wikipedia.org/wiki/Mobile_telecommunicationshttp://en.wikipedia.org/wiki/3G


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Why UMTS?

Always-on

Personalised Location aware

Real-time and flexible

Greater range of enriched multimedia services

Higher data rates for a greater number of users


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Disadvantages

United States and Japan, have allocated spectrum

differently from the ITU recommendations

Compared to GSM, UMTS networks initiallyrequired a higher base station density

Problems with handover from UMTS to GSM

Different Spectrum leads to different Equipments
http://en.wikipedia.org/wiki/International_Telecommunications_Unionhttp://en.wikipedia.org/wiki/International_Telecommunications_Union


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Applications

Internet services - Internet Web pages browsing by

Mobile Devices

Location services

Finder Multimedia messaging

Picture messaging

Video messaging

Banking

Games

Animated Chat

Downloads


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Future Scope of UMTS

Video Conferencing to be made easier

Adopting recent advances in the Internet arena and

in UMTS by exploring applicability of nativeinternet protocols

Handover from UMTS to GSM will be easier

The telephony services will be combined withinherent capabilities of UMTS satellites like wide

area coverage, broadcasting, and location

determination.


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THANKS

Documents

PPT on Wi-fi, WLAN, UMTS