The document discusses wireless communication technologies and protocols, including Wi-Fi, Bluetooth, and Wireless Application Protocol (WAP). It defines key terms like wireless clients and describes common wireless devices like smartphones, laptops, and smartwatches. The document also summarizes the WAP architecture and its layered design. It explains that WAP allows limited internet access from devices with low bandwidth and processing power, like early mobile phones, using protocols like WML and WSP.

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WIRELESS APPLICATION PROTOCOL:
UNIT -I : Sr. No.2:
Wireless Terminologies :-
1.Wireless Communication
Wireless communication refers to any type of data exchange between the parties that is performed
wirelessly (over the air). This definition is extremely wide, since it may correspond to many types
of wireless technologies, like −
 Wi-Fi Network Communication
 Bluetooth Communication
 Satellite Communication
 Mobile Communication
All the technologies mentioned above use different communication architecture; however they
all share the same "Wireless Medium" capability.
2. Wi-Fi
Wireless Fidelity (Wi-Fi) refers to wireless local area network. It is based on IEEE
802.11 standard. Wi-Fi is a type of wireless network you meet almost everywhere, at your home,
workplace, in hotels, restaurants and even in taxis, trains or planes. These 802.11 communication
standards operate on either 2.4 GHz or 5 GHz ISM radio bands.
These devices are easily available in the shops that are compatible with Wi-Fi standard.
3. Wireless Clients
Wireless clients are considered to be any end-devices with a wireless card or wireless adapter
installed.
4. Modern Smartphones

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These are one of the most universally used wireless devices we see in the market. They support
multiple wireless standards on one box, for example, Bluetooth, Wi-Fi, GSM.
5. Laptops
These are a type of device which we all use every single day.
6. Smartwatch
It can synchronize with your smartphone via a Bluetooth.
7. Smart-home Equipment
With the current progress of the technology, smart-home equipment might be for example a
freezer that you can control over Wi-Fi or a temperature controller.
Wireless Application Protocol
When we think about wireless communication, we imagine some systems connected to antennas
that speak together over the air using radio waves that are invisible to human eye.
WAP stands for Wireless Application Protocol. The dictionary definition of these terms are as
follows −
 Wireless − Lacking or not requiring a wire or wires pertaining to radio transmission.
 Application − A computer program or piece of computer software that is designed to do a
specific task.
 Protocol − A set of technical rules about how information should be transmitted and received
using computers.
Security is an essential part of any transaction that takes place over the internet. Customer will
lose his/her faith in e-business if its security is compromised. Following are the essential
requirements for safe e-payments/transactions −
• Confidential − Information should not be accessible to unauthorized person. It should not be
intercepted during transmission.

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• Integrity − Information should not be altered during its transmission over the network.
• Availability − Information should be available wherever and whenever requirement within
time limit specified.
• Authenticity − There should be a mechanism to authenticate user before giving him/her
access to required information.
• Non-Repudiability − It is protection against denial of order or denial of payment. Once a
sender sends a message, the sender should not able to deny sending the message. Similarly
the recipient of message should not be able to deny receipt.
• Encryption − Information should be encrypted and decrypted only by authorized user.
• Auditability − Data should be recorded in such a way that it can be audited for integrity
requirements.
WAP is the set of rules governing the transmission and reception of data by computer
applications on or via wireless devices like mobile phones. WAP allows wireless devices to view
specifically designed pages from the Internet using only plain text and very simple black-and-
white pictures.
WAP is a standardized technology for cross-platform, distributed computing very similar to
the Internet's combination of Hypertext Markup Language (HTML) and Hypertext Transfer
Protocol (HTTP), except that it is optimized for:
 low-display capability
 low-memory
 low-bandwidth devices, such as personal digital assistants (PDAs), wireless phones, and
pagers.
WAP is designed to scale across a broad range of wireless networks like GSM, IS-95, IS-136,
and PDC.

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1.1 The Internet Model
The Internet model makes it possible for a client to reach services on a large number of origin
servers, each addressed by a unique Uniform Resource Locator (URL).
The content stored on the servers is of various formats, but HTML is the predominant. HTML
provides the content developer with a means to describe the appearance of a service in a flat
document structure. If more advanced features like procedural logic are needed, then scripting
languages such as JavaScript or VB Script may be utilised.
The figure below shows how a WWW client request a resource stored on a web server. On the
Internet standard communication protocols, like HTTP and Transmission Control
Protocol/Internet Protocol (TCP/IP) are used.
The content available at the web server may be static or dynamic. Static content is produced once
and not changed or updated very often; for example, a company presentation. Dynamic content
is needed when the information provided by the service changes more often; for example,

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timetables, news, stock quotes, and account information. Technologies such as Active Server
Pages (ASP), Common Gateway Interface (CGI), and Servlets allow content to be generated
dynamically.
1.2 THE WAP MODEL
The figure below shows the WAP programming model. Note, the similarities with the Internet
model. Without the WAP Gateway/Proxy, the two models would have been practically identical.
WAP Gateway/Proxy is the entity that connects the wireless domain with the Internet. You
should make a note that the request that is sent from the wireless client to the WAP
Gateway/Proxy uses the Wireless Session Protocol (WSP). In its essence, WSP is a binary
version of HTTP.
A markup language − the Wireless Markup Language (WML) has been adapted to develop
optimized WAP applications. In order to save valuable bandwidth in the wireless network, WML

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can be encoded into a compact binary format. Encoding WML is one of the tasks performed by
the WAP Gateway/Proxy.
MEASURES TO ENSURE SECURITY
Major security measures are following −
Encryption − It is a very effective and practical way to safeguard the data being transmitted over
the network. Sender of the information encrypt the data using a secret code and specified receiver
only can decrypt the data using the same or different secret code.
Digital Signature − Digital signature ensures the authenticity of the information. A digital
signature is a e-signature authentic authenticated through encryption and password.
Security Certificates − Security certificate is unique digital id used to verify identity of an
individual website or user.
WAP ARCHITECTURE:
WAP is designed in a layered fashion, so that it can be extensible, flexible, and scalable. As a
result, the WAP protocol stack is divided into five layers −
LAYERS OF WAP PROTOCOL
1. Application Layer
Wireless Application Environment (WAE). This layer is of most interest to content
developers because it contains among other things, device specifications, and the content
development programming languages, WML, and WMLScript.
2. Session Layer
Wireless Session Protocol (WSP). Unlike HTTP, WSP has been designed by the WAP
Forum to provide fast connection suspension and reconnection.

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3. Transaction Layer
Wireless Transaction Protocol (WTP). The WTP runs on top of a datagram service, such
as User Datagram Protocol (UDP) and is part of the standard suite of TCP/IP protocols
used to provide a simplified protocol suitable for low bandwidth wireless stations.
4. Security Layer
Wireless Transport Layer Security (WTLS). WTLS incorporates security features that are
based upon the established Transport Layer Security (TLS) protocol standard. It includes
data integrity checks, privacy, service denial, and authentication services.
5. Transport Layer
Wireless Datagram Protocol (WDP). The WDP allows WAP to be bearer-independent by
adapting the transport layer of the underlying bearer. The WDP presents a consistent data
format to the higher layers of the WAP protocol stack, thereby offering the advantage of
bearer independence to application developers.
Each of these layers provides a well-defined interface to the layer above it. This
means that the internal workings of any layer are transparent or invisible to the layers above
it. The layered architecture allows other applications and services to utilize the features
provided by the WAP-stack as well. This makes it possible to use the WAP-stack for
services and applications that currently are not specified by WAP.
The WAP protocol architecture is shown below alongside a typical Internet Protocol stack

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WAP-Hand Held Devices:
A mobile device (or handheld computer) is a computer small enough to hold and operate
in the hand. Typically, any handheld computer device will have an LCD or OLED flatscreen
interface, providing a touchscreen interface with digital buttons and keyboard or physical buttons
along with a physical keyboard. Many such devices can connect to the Internet and interconnect
with other devices such as car entertainment systems or headsets via Wi-Fi, Bluetooth, cellular
networks or near field communication (NFC). Integrated cameras, the ability to place and receive
voice and video telephone calls, video games, and Global Positioning System (GPS) capabilities
are common. Power is typically provided by a lithium-ion battery. Mobile devices may
run mobile operating systems that allow third-party apps specialized for said capabilities to be
installed and run.
Early smartphones were joined in the late 2000s by larger, but otherwise essentially the
same, tablets. Input and output is now usually via a touch-screen interface. Phones/tablets
and personal digital assistants may provide much of the functionality of a laptop/desktop
computer but more conveniently, in addition to exclusive features. Enterprise digital
assistants can provide additional business functionality such as integrated data capture

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via barcode, RFID and smart card readers. By 2010, mobile devices often contained sensors such
as accelerometers, magnetometers and gyroscopes, allowing detection of orientation and motion.
Mobile devices may provide biometric user authentication such as face recognition or fingerprint
recognition.
A WAP device is a combination of hardware and software capable of running a WAP-compliant
microbrowser, such as a WAP-enabled mobile phone or a PDA. A PC can also be used as a WAP
device, if you download a WAP phone emulator from one of the developer sites. The emulator
allows you to use a virtual phone on your desktop. Some major suppliers such as Ericsson, Nokia,
and Openwave, have developer sites where you can download software development kits (SDKs)
containing WAP emulators.
A WAP phone can run any WAP application in the same way that a Web browser can run any
HTML application. Once you have a WAP phone, you can access the Internet simply by entering
URLs and following the links that appear.
These devices provide easy and secure access to the internet content and other services such as
banking, leisure, and unified messaging. Furthermore, access is not restricted only to the Internet,
but it can also deal with intranet information in the same way as internet content because both
are based upon HTML.
What are handheld devices?
A handheld is any portable device that can be carried and held in one's palm. A handheld can
be any computing or electronic device that is compact and portable enough to be held and used
in one or both hands. A handheld may contain cellular communication, but this category can
also include other computing devices.
Ex:
 Cellphone.
 iPad.
 iPod.
 Blackberry.
 PDA.
 Handheld Computers.

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Mobile Devices and Systems: In today’s computing world, different technologies have emerged.
These have grown to support the existing computer networks all over the world. The advent of
portable computers and laptops, PDA, PC tablets and smartphones, has in turn made mobile
computing very convenient.
Smartphone Features:
 A mobile smartphone is a handheld computing device. GSM, CDMA or tri-band wireless
radio interface to a cellular network.
 A smart T9 Keyboard (QWERTY)
 LCD display or touch screen
 PIM (Personal Information Manager) - phone contacts, contact addresses, and emails
 Send and Receive SMS messages of up to 160 characters per SMS
 MMS (Multimedia Messaging Service)
 Smartphones are WAP, WiFi
 Games, E-ticketing and E-Commerce
 Bluetooth
 GPS
HANDHELD DEVICES WITH OPERATING SYSTEMS :
1. Windows CE based devices:
Windows CE is an operating system developed by Microsoft and designed for small footprint
devices or embedded systems. Windows CE is different from the Windows operating systems
for desktops but they share similar application programming interfaces for a considerable
number of classes.
Some of the features of Windows CE based devices are given below.
 Kernel
 Multitasking

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 High Resolution color display
 QWERTY
 Microphone
 API
 PIM, MS office
 Compact flash
 Digital Camera
 USB port
 Calculator
 Media Player
 Games
 Clock Speed
2. MAC OS based devices:
Apple iPhone based on MAC Operating System
It has four abstract layers
 First layer for Basic
 Second layer for Core services
 Third layer for Media
 Fourth layer for Touch
MAC OS requires 500 MB