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Jenniferlinn
Joined: 24 Dec 2008
Posts: 23
Location: UK
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 Posted: Wed Dec 31, 2008 8:30 am Post subject: Introduction to WAP |
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This is a popular standard for use in mobile computing devices. It uses a derivative of the JavaScript standard language called WScript. This is constructed within a framework called WML, which is built around a structure organized like a stack of cards rather than pages, although the linkages between them are similar.
WAP bridges the gap between the mobile world and the Internet as well as corporate intranets and offers the ability to deliver an unlimited range of mobile value-added services to subscribers—independent of their network, bearer, and terminal.
WAP content and applications are specified in a set of content formats based on the familiar WWW content formats. Content is transported using a set of standard communication protocols based on the WWW communications protocols. A micro browser in the wireless terminal co-ordinates the user interface and is analogous to a standard web browser.
WAP defines a set of standard componetnts that enable communication between mobile terminals and netwok servers, including:
* Standard naming model - WWW-standard URLs are used to identify WAP content on origin servers. WWW-standards URIs are used to identify local resources in a device, eg call control functions.
* Content typing - All WAP content is given a specific type consistent with WWW typing. This allows WAP user agents to correctly process the content based on its type.
* Standard content formats - WAP content formats are based on WWW technology and include display markup, calender information, electronic business card objects, images and scripting language. Formats include, WML, WMLScript and WBMP.
* Standard communication protocols - WAP communuication protocols enable the communication of browser requests from the mobile terminal to the content server.
The WAP content types and protocols have been optimized for hand-held wireless devices. WAP utilizes proxy technology to connect between the wireless domain and the Internet. The WAP proxy typically is compresed of the following functionality:
* Protocol Gateway - The protocol gateway translates requests from the WAP protocol stack (WSP, WTP, WTLS, and WDP), as shown in Figure 3, to the WWW protocol stack (HTTP and TCP/IP).
* Content Encoders and Decoders - The content encoders translate WAP content, WML pages and WMLScript programs, into compact encoded formates to reduce the size of data over the wireless network.
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