3. Coordination: System Model and Requirements
This chapter identifies the research goal of this thesis. At first, Section 3.1 presents the system model which provides a concise definition of the targeted pervasive systems. Subsequently, Section 3.2 discusses coordination as the approach to handle interferences in multi-user pervasive systems. Finally, Section 3.3 infers and analyzes requirements towards a coordination approach from the characteristics described in the system model. 3.1. System Model The targeted systems are multi-user pervasive systems in which a multitude of applica- tions are executed in parallel. A pervasive system consists of a set of entities – users, devices which are connected via a network and pervasive applications – and the physical space in which the entities reside. A user in a pervasive system is a human who makes use of the functionality provided by the pervasive system. To provide functionality, the pervasive system comprises a set of heterogeneous devices which are able to form net- works. This set may consist of stationary as well as mobile devices which are carried by users. Furthermore, the existence of sensors which are able to capture the state of the physical space as well as the existence of actuators which allow control of objects in the environment is assumed. The resourcefulness of devices may range from powerful devices like a server down to resource-poor devices like a temperature sensor. Functionalities are realized through the execution of pervasive applications. While a user may execute several applications in parallel it is assumed that each application is executed by a single user, 32...
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