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30-05-2012, 01:45 PM
Post: #1
Mobile Operating System PPT
Mobile Operating System



.ppt  mobile_os.ppt (Size: 2.21 MB / Downloads: 170)

SYMBIAN OPERATING SYSTEM



Symbian is the most popular mobile OS.

It is an open source O.S

It is designed by NOKIA.

It is available to the user at “symbian.nokia.com”.


VERSIONS


Till now four versions of SYMBIAN OS have been launched.
Symbian^1 - used in Nokia 5800, 5233, Samsung i8910 Omnia HD etc.
Symbian^2.
Symbian^3/Symbian^4 – used in Nokia Nseries , Eseries and C series etc.



CRITICISM


SYMBIAN^1 and SYMBIAN^2 were replaced by SYMBIAN^3 as they do not support many applications as multitouch inputs, multi screens etc. After commencement of ANDROID OS the demand for SYMBIAN has gradually declined.


ANDROID OPERATING SYSTEM


ANDROID is one of the leading operating systems.
It was lauched in 2008.
It is a free and open source operating system.
It is developed by GOOGLE.
It is available at “android.com”.


iOS OPERATING SYSTEM


Commonly known as Apple iOS.
It was initially released in 2007 in the form of iPHONE ‘s initial version.
Derived from Mac OS X.
It is used in iPHONE , iPOD , Apple TV.
Official website is “apple.com\ios”.
20-10-2012, 01:42 PM
Post: #2
RE: Mobile Operating System PPT
Mobile Operating Systems


.pptx  Mobile Operating System...pptx (Size: 507.62 KB / Downloads: 58)

Mobile Requirements

●Limited resources CPU: 220 –370 MHz (ARM 9/ARM 11), 64-128 MB Ram
●No hard disc Therefore no virtual (= “unlimited”) memory
●Power management Battery life, data safety in case of power loss is an issue
●Compact Not much room for UI and the application itself Reuse of common components important
●Reliability Phone functionality always highest priority “Always on”.

Introduction

Design and capabilities of a Mobile OS (Operating System) is very different than a general purpose OS running on desktop machines:
mobile devices have constraints and restrictions on their physical characteristic such as screen size, memory, processing power and etc.
Scarce availability of battery power
Limited amount of computing and communication capabilities
Thus, they need different types of operating systems depending on the capabilities they support. e.g. a PDA OS is different from a Smartphone OS.
Operating System is a piece of software responsible for management of operations, control, coordinate the use of the hardware among the various application programs, and sharing the resources of a device.

Mobile Operating System Platforms

There are many mobile operating systems. The followings demonstrate the most important ones:
Java ME Platform
Symbian OS
Linux OS
Windows Mobile OS
iPhone OS
Google Android Platform

Java ME Platform

J2ME platform is a set of technologies, specifications and libraries developed for small devices like mobile phones, pagers, and personal organizers.
Java ME was designed by Sun Microsystems. It is licensed under GNU General Public License

Java ME Main Components

Configuration: it defines a minimum platform including the java language, virtual machine features and minimum class libraries for a grouping of devices. E.g. CLDC
Profile: it supports higher-level services common to a more specific class of devices. A profile builds on a configuration but adds more specific APIs to make a complete environment for building applications. E.g. MIDP

Java ME CLDC

We focus on “Low-end” consumer devices:
CLDC configuration address the following areas:
Java language and virtual machine features
Core Java libraries
CLDC Specific Libraries (Input/output & Networking)
Security: CLDC addresses the following topics to security
At the low-level the virtual machine security is achieved by requiring downloaded Java classes to pass a class file verification step.
Classes in protected system packages cannot be overridden by applications.

Symbian OS

Symbian OS is 32 bit.
It is a multitasking operating system and very less dependence on peripherals.
Kernel runs in the privileged mode and exports its service to user applications via user libraries.

Symbian OS Structure

User libraries include networking, communication, I/O interfaces and etc.
Access to these services and resources is coordinated through a client-server framework.
Clients use the service APIs exposed by the server to communicate with the server.
The client-server communication is conducted by the kernel.

Symbian OS Features

Real-time: it has a real-time, multithreaded kernel.
Data Caging : it allows applications to have their own private data partition. This feature allows for applications to guarantee a secure data store. It can be used for e-commerce applications, location aware applications and etc.
Multimedia: it supports audio, video recording, playback and streaming, and Image conversion.

Google Android Platform

It is a platform and an operating system for mobile devices based on the Linux operating system.
It allows developers design applications in a java-like language using Google-developed java libraries.
It supports a wide variety of connectivity such as GSM, WiFi, 3G, …

Google Android Platform

As demonstrated in the previous slide, the Android platform contains the following layers:
Linux Kernel: Android relies on Linux for core system services such as security, memory management, process management and etc.
Android [7] Runtime: it provides a set of core libraries which supports most of the functionality in the core libraries of Java. The Android Virtual Machine known as Dalvik VM relies on the linux kernel for some underlying functionality such as threading,…
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