Coloured Petri nets (2nd ed.): basic concepts, analysis methods and practical use: volume 1
Coloured Petri nets (2nd ed.): basic concepts, analysis methods and practical use: volume 1
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Presence information is one of the key aspects of mobile computing. Depending on the type of presence information, a variety of services can be built on top of a basic presence architecture. These can range from simple notification services and context-aware computing to more complex dynamic discovery and load balancing in mobile environments such as airborne web services (AWS). This paper gives details of a validated presence architecture based on the Session Initiation Protocol (SIP). Although SIP is viewed as an internet telephony protocol, in reality SIP applications go much beyond basic telephone services. This makes a SIP based Presence architecture even more attractive. By using the modular and hierarchy mechanism of our adopted modeling approach, other services and applications for mobile computations that make use of presence can be easily built on the top of the presented model and analyzed.