MOBILE COMPUTING Jitendra Patel ROLL NO :- 38 TY MSC(CA & IT)

What is mobile computing? According to a dictionary: Mobile: Able to move freely Computing: The activity of using a computer

Mobile Computing Desktop Laptop Mobile Computing?

Mobile Computing Able to communicate (or to access information) anytime, and anywhere Wireless Access Network Portable Devices Data Server, Other People, etc.

Portable Devices Laptop fully functional standard applications PDA simple graphical displays character recognition simplified WWW Laptop fully functional standard applications Mobile phones voice, data simple text displays Palmtop tiny keyboard simple versions of standard applications

Advantages and Limitations Limited battery life Screen display Slow mobile Internet connection Wireless Internet coverage may not exist More costly Less rugged Communicate wherever you are Access and change electronic information Access Internet through wireless network

Paging Devices Inexpensive Lightweight Different kinds Radio devices Numeric Voice Alphanumeric Two-way pagers (transmitter) Radio devices Translate radio waves into digital signals

Cellular Phone Features Auto-redial Call timers Voice mail Internet access Microbrowser Wireless Markup Language Text messaging SMS (Short Message Service) MMS (Multimedia Message Service)

Cell Phones Have the Same Components as a Computer! Processor (CPU) Internal memory up to 750 KB Store contact data, images, ring tones Operating system Symbian OS Input, Output devices Microphone, keypad, camera

MP3 Players for Storing Music Digital files (bits) Varying storage space Memory chips (64 to 256 MB) Built-in hard drive (up to 40 GB) Removable flash memory card (64 MB to 1GB) Store up to 5,000 songs Additional options: Images Video

MP3 Player Ripping Transfer Files to MP3 Player Converting a song from a CD into a digital MP3 file Sampling Rate Transfer Files to MP3 Player Software USB 1.0 port FireWire port USB 2.0 port

Personal Digital Assistants (PDA) Personal Digital Assistants Small, smaller, smallest View, store and transmit data from a handheld device New applications Mix of personal and business data Less personal Access and store corporate data

PDAs Have the Same Components as a Computer! Palm computers or Handhelds Processor (CPU) Operating system Palm OS Pocket PC (Windows CE) Storage Input devices Output devices Ports

PDA Hardware Stylus for input Keyboard Processor Internal memory Integrated Folding Processor Speeds vary Internal memory Flash memory Eg. Memory Stick, CompactFlash card LCD screens Grayscale Color Digital cameras

Tablet PCs Portable and lightweight Advanced handwriting recognition Pressure sensitive screen Digital pen, digital ink Draw images and enter text Speech recognition Speech can be converted into text or commands Removable keyboard

How about wireless networks? Wireless users access the network by means of a shared channel Shared Channel Access capacity is inherently limited. Base Station

Laptop Computers Also called “notebooks” Powerful portable solution DVD/CD-RW Larger displays/hard drives RAM up to 1 GB Slower processors than desktops

Laptop or Desktop? More costly Less expandable Exposed to more hazards, possibly theft Great location flexibility Can add devices using: FireWire USB ports PC cards

Number of Subscribers in Hong Kong Will wireless Internet take off? Fixed Telephone Mobile Phone Broadband Internet

~:References:~ www.mobilecomputing.com http://anyserver.cityu.edu.hk

Thanks