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Mobile Computing - Mobility, Study notes of Mobile Computing

In this document topics covered which are Mobile Computer, Mobile computer - How?, Wireless characteristics, What is Mobility, Mobility Characteristics, Mobility.

Typology: Study notes

2010/2011

Uploaded on 09/04/2011

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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.
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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.

Mobile Computing

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. Issues in mobile computing networks  (^) Nature of medium  (^) Mobility  (^) Portability

What is Mobility

 (^) Mobility means different things to different people. Some people are quite happy being able to get around town. Others view the world in terms of time distance-Obviously, range of motion is an important aspect of mobility.  (^) Another factor in mobility is ease of access. What might be considered mobile in one context is quite immobile in another.  (^) A more pertinent example of mobility is the ever decreasing size of cellular telephones. What was once considered a "mobile phone" had to be transported in a vehicle. This continuing decrease in size and weight of handsets has greatly increased the mobility of cellular subscribers.  (^) We define mobility as the ability to send and receive communications anytime anywhere. Mobility means that both source and destination devices, applications and people are free of the constraints imposed by physical location.

Mobility Characteristics

 Location changes

location management - cost to locate is

added to communication

Heterogeneity in services

bandwidth restrictions and variability

Dynamic replication of data

• data and services follow users

Querying data - location-based responses

Security and authentication

System configuration is no longer static

Portability Characteristics

 (^) Resource constraints  (^) Mobile computers are resource poor  (^) Reduce program size – interpret script languages (Mobile Java?)  (^) Computation and communication load cannot be distributed equally  (^) Small screen sizes  (^) Asymmetry between static and mobile computers  (^) Battery power restrictions  (^) transmit/receive, disk spinning, display, CPUs, memory consume power  (^) Battery lifetime will see very small increase  (^) need energy efficient hardware (CPUs, memory) and system software  (^) planned disconnections - doze mode  (^) Power consumption vs. resource utilization