Context represents any information that can be
used to characterize the situation of an entity,
where an entity is a person, a place, or an
object that is considered relevant [1]. Fundamental
context data, called the primary/primitive
types, encompass identity, location,
activity/status, and time. Beyond that, a great
diversity of data sources can be used as contextual
information. Focusing on communication
applications, we identify five different context
dimensions: