WIRELESS COMMUNICATION
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What Is Wireless Communication ?
 Wireless communication is the transfer of information over a distance without the use of electrical conductors or "wires".
 The distances involved may be short (a few meters as in television remote control) or long (thousands or millions of kilometers for radio communications).
 When the context is clear, the term is often shortened to "wireless".
 Wireless communication is generally considered to be a branch of telecommunications.
 It encompasses various types of fixed, mobile, and portable two way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking.
 Other examples of wireless technology include GPS units, garage door openers and or garage doors, wireless computer mice, keyboards and headsets, satellite television and cordless telephones.
History
 The term "Wireless" came into public use to refer to a radio receiver or transceiver (a dual purpose receiver and transmitter device).
 Establishing its usage in the field of wireless telegraphy early on; now the term is used to describe modern wireless connections such as in cellular networks and wireless broadband Internet.
 It is also used in a general sense to refer to any type of operation that is implemented without the use of wires, such as "wireless remote control" or "wireless energy transfer", regardless of the specific technology that is used to accomplish the operation
Examples - radio, infrared, ultrasonic.
WHAT IS WAP ?
The wireless industry came up with the idea of WAP. The point of this standard was to show internet contents on wireless clients, like mobile phones.
 WAP stands for Wireless Application Protocol.
 WAP is an application communication protocol.
 WAP is used to access services and information.
 WAP is inherited from Internet standards.
 WAP is for handheld devices such as mobile phones.
 WAP is a protocol designed for micro browsers.
 WAP enables the creating of web applications for mobile devices.
 WAP uses the mark-up language WML (not HTML).
 WML is defined as an XML 1.0 application.
The Wireless Application Protocol
 WAP is published by the WAP Forum, founded in 1997 by Ericsson, Motorola, Nokia, and Unwired Planet.
 Forum members now represent over 90% of the global handset market, as well as leading infrastructure providers, software developers and other organizations.
 The WAP protocol is the leading standard for information services on wireless terminals like digital mobile phones.
 The WAP standard is based on Internet standards (HTML, XML and TCP/IP).
 It consists of a WML language specification, a WMLScript specification, and a Wireless Telephony Application Interface (WTAI) specification.
what happens when you access a Web site using a WAP-enabled device :-
 You turn on the device and open the minibrowser.
 The device sends out a radio signal, searching for service.
 A connection is made with your service provider.
 You select a Web site that you wish to view.
 A request is sent to a gateway server using WAP.
 The gateway server retrieves the information via HTTP from the Web site.
 The gateway server encodes the HTTP data as WML.
 The WML-encoded data is sent to your device.
You see the wireless Internet version of the Web page you selected
What happens between the gateway and the client relies on features of different parts of the WAP protocol stack :-
 WAE - The Wireless Application Environment holds the tools that wireless Internet content developers use. These include WML and WMLScript, which is a scripting language used in conjunction with WML. It functions much like JavaScript.
 WSP - The Wireless Session Protocol determines whether a session between the device and the network will be connection-oriented or connectionless.
 WTP - The Wireless Transaction Protocol acts like a traffic cop, keeping the data flowing in a logical and smooth manner. It also determines how to classify each transaction request:
 Reliable two-way
 Reliable one-way
 Unreliable one-way
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