In this age of significant telecommunications competition, mobile network operators continuously seek new and innovative ways to create differentiation and increase profits. One of the best ways to do accomplish this is through the delivery of highly personalized services. One of the most powerful ways to personalize mobile services is based on location. One of the most obvious technologies behind LBS is positioning, with the most widely recognized system being the Global Positioning System (GPS). There are however, other means of positioning in addition to GPS. These other technologies are network based positioning and typically rely on various means of triangulation of the signal from cell sites serving a mobile phone. In addition, the serving cell site can be used as a fix for location of the user.
2/28/2011
Features of different type of wireless networks
Wireless network type | Frequency used | Maximum data rate possible | Technologies used in transmission | Coverage area | |
Personal area network | 2.4GHz | 250 Kbps | Bluetooth or infrared and 802.15.4(ZigBee)/ NFC/UWB | <10m | |
Wireless Local Area Network | 2.4 GHz -5 GHz | 150Mbps | microwave, WiFi technologies | 100m | |
Wireless Metropolitan Area Networks | 10-66 GHz | 34 to 155 Mbps | microwave, radio, ATM, FDDI, and SMDS,802.16 | 50Km | |
Cellular Networks | 450 MHz 900MHz 1.8GHz 2.1Ghz | 14.4kbps 7.2Mbps | GPRS, CDMA , EV-DO, EDGE, 3GSM,iDEN, DECT,NMT, GSM 900,GSM 1800,UMTS | 48.9km 26.9km 14km 12km | |
Paging Network | 900 MHz 400MHz | 4.8kbps | POCSAG and ERMES UHF | 80-100km |
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2/26/2011
Mobile computing
Mobile computing refers to the use of small and portable computing devices in wireless enabled networks that provide wireless connections to a central main server. These devices include laptops, notebook PCs, tablet PCs, palmtops, personal digital assistant (PDAs) and other hand held devices. A radio-signaling device is installed inside these devices for receiving and transmitting electronic data. It provides mobility to the user then user can create, access, process, store, and communicate information without being constrained to a single location. And it provides the capabilities such as access internet, e-mail, file sharing, etc.
Windows Azure Platform
Windows Azure (WA) platform is a cloud services operating system that serves as the development, service hosting and service management environment. It provides developers with on-demand compute and storage to host, scale, and manages web applications on the internet through Microsoft datacenters. It is also a flexible platform that supports multiple languages and integrates with your existing on-premises environment. To build applications and services on WA, developers can use their existing Microsoft visual studio expertise. In addition, WA supports popular standards, protocols and languages including SOAP, REST, XML, Java, PHP and Ruby. And also it handles load balancing, resource management and life cycle management of a cloud service based on requirements that the owner of the service established. A developer who wishes to deploy an application to WA specifies the service topology, including the number of instances to deploy and any configuration settings. WA deploys the service and manages upgrades and failures to maintain availability.
Building a WA application looks much like building a traditional Windows application and it supports both .NET applications and applications built using unmanaged code. WA provides Visual Studio 2008 project templates for creating Web roles, Worker roles, and applications that combine the two. One obvious difference is that WA applications don’t run locally. Thus, to mitigate that challenge development fabric, a version of the WA environment that runs on a developer’s machine, plays the role,. The development fabric runs on a single machine running either Windows Server 2008 or Windows Vista.
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