unit-1 - mobile computing introduction (gtu syllebus)

Wireless Communication & Mobile ProgrammingUNIT- 1 – MOBILE COMPUTING INTRODUCTION

A C A D E M I C Y E A R : 2 0 1 3 - 1 4 @ S C E T, S U R AT

VINTESH PATEL, SCET 1

Reference Book

“Mobile Computing” By Asoke K Telukder, Roopa R Yavagal, TMH

Chapters – 2


Mobile Computing -Architecture Introduction/Evolution

Architecture


In mainframe computers – many system uses TP/Transaction Processing environment. At core of TP System, there is TP Monitor Software.

There is the resources like – Visual Display, Point of Sell Terminal, Printers etc.

A TP System monitors the resources at all the terminals & coordinates with the users to pick up the right processing task to service business transaction. It also manages all objects & connects them by policies & rules – decided by Database Object/s.

Now a days, World is moving from large, centralized mainframe computers to the decentralized systems, technology moves towards the 2-tier Architecture.

With the help of Internet based network systems/applications & cheaper computing power, technology is moving towards the Centralized server-base architecture.

The network centric mobile computing uses the 3-tier architecture as shown in figure in next slide.


Architecture



Architecture


First Tier/Layer

User Interface/Presentation Layer – deals with the user facing device handling & rendering. This tier includes a user interfacing components like Textbox, Labels, Checkboxes, etc.

Second Tier/Layer

Process Management/application Layer – deals with Business logic & Rules. It is capable of accommodating hundreds users.

Thired Tier/Layer

Database Management/Data Tier – deals with DB management & access.

Three-Tier ArchitectureDIY


Design considerations for Mobile Computing


Mobile computing environment needs to be context-independent as well as context-sensitive.

Here “Context” means all information that help determine the state of object. The object can be person/device/place/physical or computational object/any other entity that is being tracked by the system.

Mobility implies the service is associated with the user/device will change constantly. So the change in the content & behavior of the applications should be adopted to suit the current situation.

There are many ways in which contexts can be adapted,• Content with Context Awareness

• Content switch on Context

• Content Transcoding on Context

Design considerations for Mobile Computing• Client Context Manager

• Composite Capabilities/CC or Preference Profiles/PP

• Policy Manager

• Semantic Web

• Security Manager

• Platform for Privacy Preference Project

• Adaptability Manager

• Content Adaptation & Transcoding

• Content Rating & Filtering




• Policy Manager

• Semantic Web









• Policy Manager

• Semantic Web







DIY

WAP - Architecture


WAP Architecture


WAP – Protocol Layers


SOC & AOC Clients Mobile users need solutions that can be used effectively at any time duringtheir work day and used wherever their works takes them.

Mobile technology can be implemented with Sometimes On Connectivity/SOCto mobile devices or Always On Connectivity/AOC.

SOC and AOC terminology effectively describe to our clients thecommunications frequency and performance: capabilities of alternatives formobile computing solutions.

SOC clients can work effectively in a disconnected mode and take advantage ofwireless or wired connections when they are available while AOC clients must beconnected all or most of the time to be effective.


SOC Clients SOC clients have the ability to store large amounts of data on the mobile deviceand provide the user with a complete application solution even when the userdoes not have a wireless or wired data connection.

Data updates can occur when wireless, Internet dialup, network or desktopsynchronization connections are available. Regardless of connectivity, productivework can proceed. Data updates, when they do occur, can be fast bursts of smallamounts of data rather than entire screen images that AOC clients employ.

SOC client technology typically requires a Pocket PC or WinCE device in order tohave sufficient processing power and data storage capability. AOC clients havesmall amounts of data or no data on board the device.


AOC Clients AOC clients require a wireless connection that is always on to be able to accessdata and the user interface, or screen image.

AOC clients typically use a browser for application interactions. Internet-likeHTML or WAP is employed by the browser to view web pages that are especiallydesigned for the smaller screens of mobile devices.

AOC clients require transmission of the data and screen image for each useraction. Consequently, mobile workers need a wireless connection constantlyavailable in order to effectively use AOC client mobile devices.


References “Mobile Computing” By Asoke K Telukder, Roopa R Yavagal, TMH

“Principle of Wireless Networks” By Pahlavan & Prashant – Highly recommended for

Specific Questions(& For Better Grades Specially in GTU)


unit-1 - mobile computing introduction (gtu syllebus)

Documents

mobile computing environment

mobile computing introduction

mobile computingvintesh

context content transcoding

content behavior

reference bookmobile

s u r atvintesh patel

core of tp system