Mobile computers and communication devices are establishing themselves as ubiquitous features of daily life. This development is linked to tremendous growth in the number and sophistication of mobile and mobile-aware software applications. Increasingly, such applications need access to information about their own and other objects' physical locations, a requirement known as location-awareness. Existing location-aware applications and systems are typically tailored to a particular type of positioning technology. This is unsatisfactory considering that no technology provides ubiquitous coverage. Equally, there are few accepted models and abstractions for building location-aware applications, making their design and implementation costly and error-prone. Location-awareness raises legitimate concerns about personal and organisational privacy. These vary widely across administrative and application domains. Hence, there is a need to nd a model allowing a balance between protection and functionality as appropriate for a particular target environment
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