30-05-2012, 10:10 AM
Mobile Computing Networks
Mobile Computing Networks.pdf (Size: 155.87 KB / Downloads: 300)
What is mobile computer?
• A computer which you can take with you all around.
• You can do all the things which can be done with a
desktop computer.
• You should be able to use same software, which you use
on a desktop computer.
Mobile computer - How?
• One possibility is to have a standalone computer capable of
• storing large amount of software and data files,
• processing power to support the required applications.
• Modern day laptop computer are something like this.
• Whenever you are static, connect to internet through an
access point and you can do the file transfer, telnet, web
browsing etc..
• While on the move, connectivity is desired for using
software which require cooperation of at least two
machines.
Option for connectivity
• An easy option
• Use cellular mobile phone network to connect to some
Internet Service Provider and hence to internet.
• What you need - cellular phone/ corresponding modem.
• Not a good option for campus wide mobile network.
• dependent on the mobile telephone network operator
• cheaper wireless LAN options available.
Other extreme of mobile computer
• Mobile computing device
• acts as a terminal
• have wireless connectivity to the network
• Whatever command or application you run is executed
on a remote server.
• Mobile computing device acts as remote terminal.
Wireless medium
• Disconnection
• Common in radio environments - due to noise.
• due to moving into dark areas
• Blocking by servers e.g., due to too many requests to a file
server.
• Standalone mobile computer can tolerate this kind of problem
better.
• Portable terminals will not function.
Summary
Mobile computing systems have different constraints and hence
different solutions. Main challenges are due to
Wireless - unreliable.
Mobility - dynamism of information.
Portability - limited resources
Resource list for further information on mobile computing.
1 http://www.cs.purdue.edu/research/cse/sc...icomp.html