Typed context awareness Ambient Calculus for pervasive applications

Abstract

The idea of pervasive computing is that information processing will become part of everyday life, and will be available everywhere, making computing so natural to the point of being invisible in the ambient. An important concept that arises with pervasive computing is context awareness . Context is any information that can be used to characterize an entity. Based on contextual information, applications can dynamically adapt themselves to the environments in which they operate. The Calculus of Context-aware Ambients (CCA) is an untyped formal language used to describe mobile and context-aware pervasive applications. The CCA extends the Ambient Calculus by providing new features, such as context-guarded action and process abstraction, allowing to model contexts and context-aware computations. In this work, we define a type system for the CCA, called CCA T , with the focus in the communication between processes and in the correct use of process abstraction and contexts, extending previous works on the definition of type systems for mobile computing. Moreover, we prove that the proposed type system has the subject reduction property (or type preservation). We also model a hospital scenario using CCA T to demonstrate the use of the proposed type system.

A Process Algebra With Qualitative Calculus for Modeling Spatio-Temporal Behaviour

“…The Calculus of Context-aware Ambient (CCA) [27] was proposed in 2011 for modeling and verification of mobile systems that are context-aware. Its typed version [28] was proposed later to gain a further control of the communication between ambients. CCA inherited the notion of ambient as space from AC [18], and enriched AC with the 'context-aware capability' so that each agent can 'be aware of' the context (i.e., the environment) accordingly.…”

“…Comparing with π−calculus [17], AC [18] and other calculus based on them [20]- [23], [25], [27], [28], QCSP is equipped with a more general ability to express qualitative relations. In fact, the space relations in π−calculus and AC are just a special case in QCSP by selecting a 'suitable' boolean algebra (illustrated in the caption of Table 1).…”