Mobile Computing

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WELCOME TO SEMINOR

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SEMINAR ON “MOBILE COMPUTING” PRESENTED BY REDDISUDHARSANA.B (1011167)

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INTRODUCTION Mobile simply describes computing device that is not restricted to a desktop. A mobile device may be a PDA ,a “small” cell phone or web phone ,a laptop Computer, or any one of numerous other devices that allow the user to complete computing tasks without being tethered ,or connected.

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What Is Mobile Computing ? What is computing? Operation of computers (according to oxfords advance learner’s dictionary). What is the mobile? That someone /something can move or be moved easily and quickly from place to place . What is mobile computing? Users with portable computers still have network connections while they move.

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Why mobile computing ? Mobile data communications has become a hotly debated issue. Interest surrounding paging, circuit-switched and packet –switching networks has lit the fir for the debate and the announcement of new-technology networks is adding fuel to the fire. Voice telecommunication has been introduced by the mobile phone and is spreading around all over the world like a contagious virus.

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Where mobile computing? Mobile phones Cellular networks

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Mobile phones The fixed PSTN severely limits communications by forcing people to be present at particular location for connection to be established The need of new networks that provide the ability of mobile communications is met

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Cellular networks The number of cellular subscribers world wide has been increased to 40 million in only twelve years. Each cell has a number of channels assigned to it which can then be used by a subscriber .

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Data communications And mobility Circuit switching Packet switching The sender The receiver The position of the packet in the message The actual message

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CDPD technology There are other alternatives to this technology namely circuit switched cellular,specialised mobile radio and wireless data Networks. CDPD networks allow fixed or mobile users to connect to the network across a fixed link and a packet switched system respectively.

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CDPD overview The hierarchy consists of the following levels. Mobile data intermediate systems. . Mobile end user interface. Mobile data base station.

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CDPD NETWORK RELIABILITY User Anonymity Fraud prevention Protection of user data User Authentication

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User Authentication: The procedure which checks if the identify of the subscriber Transferred over the radio path corresponds with the details held in the network. User Anonymity: Instead of the actual directory telephone number, the international mobile subscriber identity number is used with in the network to uniquely identify a mobile subscriber.

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Fraud Prevention : Protection against impersonation of authorized users and fraudulent use of the network is required. Protection of user data: All the signals within the network are encrypted and the identification key is never transmitted through the air. This ensures maximum network and data security.

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Mobile Devices Giga Information Group suggests a categorization of five different types of mobile devices: Laptop computers PDAs and handheld PCs Pagers Smart phones and cellular phones Task devices, such as bar code scanners

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Mobile Users Telecommuters who work away from the office but connect directly to the office from a remote location. Casual telecommuters and other workers who work a few days per month outside the office. Predominantly mobile employees

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APPLICATIONS OF MOBILE COMPUTING For Estate Agents Emergency Services In courts In companies

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For Estate Agents Estate agents can work either at home or out in the field. With mobile computers they can be more productive. They can obtain current real estate information by accessing multiple listing services, which they can do from home, office or car when out with clients .

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Emergency Services Ability to receive information on the move services are involved. Information regarding the address, type and other details of an incident can be dispatched quickly, via a CDPD system using mobile computers, to one or several appropriate mobile units which are in the vicinity of the incident.

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In courts Defense counsels can take mobile computers in court. When the opposing counsel references a case which they are not familiar, they can use the computer to get direct, real-time access to on-line legal database services, where they can gather information on the case and related precedents.

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In companies Managers can use mobile computers in, say, critical presentations to major customers. They can access the latest market share information. At a small recess, they can revise the presentation to take advantage of this information.

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Conclusion Mobile computing is rapidly becoming popular, and user demand for useful wireless applications is increasing. Additionally, this paper shows how these behavioral extensions serve as a powerful abstraction for practical systems

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