Overview of mobile computing

Overview of mobile computing

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  OVERVIEW OF MOBILE COMPUTING Ms..V.VENNILA AsstProfofIT BonSecoursCollegeforWomen.
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  Mobile Computing isa technology that allows transmission of data, voice and video via a computer or any other wireless enabled device without having to be connected to a fixed physical link. The main concept involves • Mobile communication • Mobile hardware • Mobile software INTRODUCTION
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  Mobile communication • Themobile communication in this case, refers to the infrastructure put in place to ensure that seamless and reliable communication goes on. • These would include devices such as protocols, services, bandwidth, and portals necessary to facilitate and support the stated services. The data format is also defined at this stage. • This ensures that there is no collision with other existing systems which offer the same service. • Since the media is unguided/unbounded, the overlaying infrastructure is basically radio wave- oriented. That is, the signals are carried over the air to intended devices that are capable of receiving and sending similar kinds of signals.
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  Mobile Hardware • Mobilehardware includes mobile devices or device components that receive or access the service of mobility. They would range from portable laptops, smartphones, tablet Pc's, Personal Digital Assistants. • These devices will have a receptor medium that is capable of sensing and receiving signals. These devices are configured to operate in full- duplex, whereby they are capable of sending and receiving signals at the same time. They don't have to wait until one device has finished communicating for the other device to initiate communications. • Above mentioned devices use an existing and established network to operate on. In most cases, it would be a wireless network.
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  Mobile Hardware • Mobilehardware includes mobile devices or device components that receive or access the service of mobility. They would range from portable laptops, smartphones, tablet Pc's, Personal Digital Assistants. • These devices will have a receptor medium that is capable of sensing and receiving signals. These devices are configured to operate in full- duplex, whereby they are capable of sending and receiving signals at the same time. They don't have to wait until one device has finished communicating for the other device to initiate communications. • Above mentioned devices use an existing and established network to operate on. In most cases, it would be a wireless network.
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  Mobile software • Mobilesoftware is the actual program that runs on the mobile hardware. It deals with the characteristics and requirements of mobile applications. This is the engine of the mobile device. • In other terms, it is the operating system of the appliance. It's the essential component that operates the mobile device. • Since portability is the main factor, this type of computing ensures that users are not tied or pinned to a single physical location, but are able to operate from anywhere. It incorporates all aspects of wireless communications.
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  3 TIER ARCHITECTURE •The network-centric mobile computing • architecture uses three-tier architecture 1) Presentation Tiers 2) Application Tiers 3) Data Tiers
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  In three tierarchitecture, the first layer is User Interface or Presentation Tier. This layer deal with user facing device handling and rendering. this tier includes a user system interface where user service reside. The second tier is the Process Management or Application Tier This layer is capable of accommodating hundreds of users. The middle process management tier controls transaction and asynchronous queuing to ensure reliable completion of transaction
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  The third finaltier is the Database Management or Data Tier. This Layer is for database access and management. The three-tier architecture is better suited for an effective networked client/server design. It provide increased performance , flexibility , maintainability ,reusability and scalability , while hiding the complexity of distributed processing from user. All these characteristic have made three-tier architecture a popular choice for Inter application and net-centric information system
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  TIER 1 • Thisis user facing System in the first tier. This is the layer of agent application and system. • These applications run on the client device and offer all the user interface. • This tier is responsible for presenting the information to the end user. • Presentation Tier include web browsers (like Mozilla, Internet Explorer etc…)WAP browsers and customized client programs.
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  TIER 2 • Itperforms the business logic of processing user input , obtaining data, and making decision • In certain case, this layer will do the transcoding of data for appropriate rendering in the presentation Tier. • In mobile computing environment in addition to the business logic there are quite a few additional management function that need to be performed
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  TIER 2 continues •Middleware frame work is defined as a layer of software, which sits in middle between the operating system and the user facing software. 1) Message –oriented Middleware 2)Transaction processing Middleware. 3) Database Middleware 4)Communication Middleware 5) Distributed Object and Components. 6)Transcoding Middleware.
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  TIER 3 • TheData Tier is used to store data needed by the application and acts as a repository for both temporary and permanent data. • These can range from sophisticate relational database, legacy hierarchical database , to even simple text files. • Database middle ware allows the business logic to be independent and transparent of the database technology and the database vendor. • Database middle ware runs between the application program and the database. • Example of such middle ware will be ODBC, JDBC,etc.
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  MOBILE DEVICES
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  MOBILE SYSTEM NETWORK 1.Cellular networks 2. WLAN networks 3. Ad Hoc Networks
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  Cellular Networks • Acell is the coverage area of a base station, connected to other stations via wire or fibre or wirelessly through switching centers. • The coverage area defines a cell and its boundaries. • Each cell base station functions as an access point for the mobile service. • Each mobile device connects to the base station of the cell which covers the current location of the device • All the mobile devices within the range of a given base station communicate with each other through that base station only
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  WLAN Networks • Forconnectivity between the Internet, two LANs, mobile devices, and computers • Mobile device connects to an access point, called a hot spot • The access point, in turn, connects to a host LAN which links up to the Internet through a router. • An open standard based on the IP (internet protocol) • Mobile IP network provides the mobile IP service using home agents and foreign agents.
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  Ad hoc Networks •The nodes, mobile nodes, and sensor nodes communicate among themselves using a base station • The base stations function as gateways. • The ad hoc networks deployed for routing, target detection, service discovery, and other needs in a mobile environment.
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