Download - PPT on Wi-fi, WLAN, UMTS
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
1/15
SEMINAR ONWI-FI , WLAN AND UMTS
Presented By:
Hemant Kumar(1705433)
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
2/15
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.
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
3/15
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
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
4/15
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 -
7/30/2019 PPT on Wi-fi, WLAN, UMTS
5/15
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
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
6/15
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.
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
7/15
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.
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
8/15
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
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
9/15
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).
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
10/15
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 -
7/30/2019 PPT on Wi-fi, WLAN, UMTS
11/15
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
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
12/15
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 -
7/30/2019 PPT on Wi-fi, WLAN, UMTS
13/15
Applications
Internet services - Internet Web pages browsing by
Mobile Devices
Location services
Finder Multimedia messaging
Picture messaging
Video messaging
Banking
Games
Animated Chat
Downloads
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
14/15
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.
-
7/30/2019 PPT on Wi-fi, WLAN, UMTS
15/15
THANKS