2/28/2011

Location based services (LBSs)


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.

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

Incoming search keywords for this post

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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.