Data flow in a sensor system: Current state and challenges

This paper presents the basic data flow in a wireless sensor network based on the current literature of the area. The first step is to study exactly how information and different data move in a system like this. Various frameworks have been proposed to represent data move from one layer to another, in order to reach the end-user. After introducing the basic parts of a sensor network in section 1, we proceed to analyze two basic frameworks that present the data flow in such systems in the following two sections. These are distinguished in two types of layers: lower and upper. Section 4 discusses the middleware of a sensor network system, where SensorML and the appropriate ontologies play an important role in data exchange between the parts of the system. The conclusions drawn from this discussion lead to important open issues for further research, paving the way for appropriate study.