6. Application Coordination in Pervasive Systems
This chapter discusses the practical realization of the coordination framework for general pervasive systems. The realization comprises the deployment of task and data components as well as the definition of points in time when data must be exchanged. For this pur- pose, Section 6.1 discusses characteristics which have an impact on realization decisions. Section 6.2 then analyzes general pervasive systems with respect to these characteristics. Subsequently, Section 6.3 derives requirements towards a practical realization before the realization decisions for interference detection and resolution are presented in Section 6.4. The chapter concludes with a discussion on measures that need to be taken in dynamic pervasive systems in Section 6.5. 6.1. System Characteristics The efficiency of application coordination in practical pervasive systems is influenced by two factors: (1) The placement of task and data components and (2) the points in time when required data is exchanged between remote devices. Depending on the characteristics of a pervasive system, decisions for component deployment and the point in time for required communication may differ. Two major factors which have an impact on these decisions are the reliability of devices in the system and their resourcefulness. Their implications on a practical realization are discussed in the following: Reliability: The first characteristic which needs to be considered for a practical realization is the reliability of devices in the system. In the context of this thesis, a device is said to be reliable if it remains within the system throughout the entire system life cycle. 98 6. Application...
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