Page 18 - DCAP512_WAP_AND_WML

WAP & WML

Notes  The WAP proxy typically is comprised of the following functionality: protocol gateway,
content encoders and decoders.

 Wireless Application Environment is a general-purpose application environment based
on a mixture of the World Wide Web (WWW) and Mobile Telephony technologies.
 WAE includes a micro-browser environment containing the following functionality:
wireless markup language, WML script and content formats.
 WAP Datagram Protocol (WDP) is the transport layer that sends and receives messages
via any available bearer network, Wireless Transport Layer Security (WTLS), an optional
security layer, has encryption facilities that provide the secure transport service, WAP
Transaction Protocol (WTP) layer provides transaction support, adding reliability to the
datagram service provided by WDP, WAP Session Protocol (WSP) layer provides a
lightweight session layer to allow efficient exchange of data between applications.

 The WAP Gateway translates WSP requests from the mobile device and sends them to a
Web Server. The data returned from the Web Server is translated by the WAP gateway
into WSP format before sending it forward to the mobile device.
 The layered architecture of the WAP is very similar to the Internet Protocol Stack.
 The WAP protocols are modeled to operate over a variety of bearer services, including
short message, circuit-switching data and packet data.
 The WAP layered architecture enables other services and applications to utilize the features
of the stack through a set of well-defined interfaces. External applications may access the
session, transaction, and security and transport layers directly.
 Initially, services are expected to run over the well-established SMS bearer. GPRS is seen
by many as the perfect partner for WAP, with its distinct time slots serving to manage data
packets in a way that prevents users from being penalized for holding standard circuit-
switched connections.

1.4 Keywords

Authentication: The authenticity of the terminal and application is ensured server.
Content Formats: It is set of well-defined data formats, including images, phone book records
and calendar information. The application environment is modeled for use with mobile devices
that have limited input keys.

Content Providers: An organization or individual that creates information, educational or
entertainment content for the Internet, CD-ROMs or other software-based products. A content
provider may or may not provide the software used to access the material.

Data Integrity: WTLS ensures that data sent between the terminal and an application server is
unchanged and uncorrupted.
Denial-of-Service: Detecting and rejecting data that is replayed or not successfully verified.

Denial-of-Service Protection: To provide protection ensuring that typical denial of service attacks
are harder to accomplish and protects the upper protocol layers.
Operators: It is an organization which provides carrier services in the wired or wireless arena.
One example is ISPs.
Pervasive Computing: It is aimed at providing people easy access to information and to help us
control information quickly, efficiently and effortlessly making lives easier for us.

12 LOVELY PROFESSIONAL UNIVERSITY