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ABSTRACT

 

3G is the third generation mobile technology that offers
integrated data and voice service over mobile network. This is the technology
of choice for upgrading existing mobile telephone service to expand capacity
and add enhanced services. Wi-Fi is the popular name for the Wireless Ethernet
802.11b Standard for WLANs. This paper makes an attempt to understand all about
Wi-Fi architecture, its advantages and disadvantages.

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Keywords-Mobile communication,
Wireless technology,

3G, 
Network performance.

 

 

1.     
INTRODUCTION

 

3G offers a vertically integrated up-down service-provider
approach to delivering wireless internet access and operate using a license
spectrum with a data rate of from 384 Kbps upto2Mbps. .The former, 3G refers to
the technology that offer integrated data and voice service over mobile
networks. The later Wi-Fi refers to Wireless Ethernet Technology which support wireless
LANs. Although the two technologies reflect fundamentally different service,
industry and architectural design goals ,origins and philosophies, each has
recently attracted a lot of attention as candidates for providing broadband
Wireless access to Internet.

 

Internet
can be accessed through Wi-Fi and 3G both.Wi-Fi has a data rate upto 54 mbits/s
whereas 3G can go upto 14 mbits/s,Wi-Fi is much faster than 3G.3G and Wi-Fi are
both wireless access technologies which operate in different frequencies and
access ranges. 3G has a coverage area beyond kilometers whereas Wi-Fi can only
go up to 250 meters.Wi-Fi is a personal wireless LAN used in short range with
low setup requirement whereas 3G is normally deployed by mobile operators.

3G (Third Generation Networks)

3G
is a one of the wireless access technology which is currently replacing 2G
networks. 33G is much faster than 2G networks. Smart phones are designed for
voice callings along with internet access and some other mobile applications.
3G networks allow voice and data services with speed variation from 200 Kbit/s
and for data delivery it is in mbit/s.

Wi-Fi (Wireless Fidelity)

Wi-Fi
is a wireless LAN technology used for short range of data usage. It is a most
commonlyused wireless technology in educational campus, households and hotspots
and for corporate usage. Wi-Fi has various varieties such as 802.11a, 802.11b
and 802.11n. 802.11a,b,g operates in 2.4 GHz frequency in the range of 40-140
meters whereas 802.11n operates in 5 GHz ranging upto 70-250 meters, resulting
in higher speed than other. We can easily setup a wireless LAN at home using
routers/modems. While setting up routers we must ensure that the security
features are enabled to avoid any other party access like setting up a
password.

2.     
Wi-Fi NETWORK ARCHITECTURE

Wi-Fi is a source of networking for different technologies of
computer networking. Wi-Fi, is a type of that technology in which radio signals
of high frequency are used to transmit data from one device to another. It only
operates on several hundred feet. Using the architectural technique of
assembling the parts of computer hardware in computer network is known as Wi-Fi
Architecture. It consists of arranging and designing of different components in
a local area networking device. Transceiver also known as access points being
the essential part for Wi-Fi is a combination of transmitter and receiver.

Components  of Wireless Network Architecture:

For establishing a local area network between different
operating systems using a set of different components we create Wi-Fi
.Components essential for Wi-Fi architecture are

1.Access points: Access point is a routing device that is used
to transmit the data between wired and wireless networking device. It is
connected with the help of Ethernet. Using infrastructure mode of network the
data can be transferred between wireless and wired network. It is operated in
less than a hundred feet zone.

2.Bridge: A type of connector used to establish connections
between wired network devices such as Ethernet and different wireless devices
is a bridge.It acts as appoint of control in W-Fi network architecture.

3.Clients: A device such as personal computers or any other
electronic devices which are inter 
linked with wireless network are clients.

Types of Modes:

The working of the WI-Fi depends on these modes namely.

1.Infrastructure Mode: A machine network
that works with each and evry workstation of wifi.

2.Ad hoc Network Mode: A network in which all
workstations are linked together to all other workstations without any obstacle
between them.

3.Mixed network mode: A network
developed by
mixing of infrastructure and ad hoc network and where all workstations can work
simultaneously.

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