context-aware application cross-layer architecture dynamic wireless network middleware mobile ad hoc networks mobile intelligent software agents real-time guarantees real-time routing resource reservation protocol
IEEE Computer Society
M. Boulkenafed, B. Hughes, R. Meier, G. Biegel, and V. Cahill, Providing Hard Real-Time Guarantees in Context-Aware Applications: Challenges and Requirements, Proceedings of the 4th IEEE International Symposium on Network Computing and Applications (IEEE NCA05), The 4th IEEE International Symposium on Network Computing and Applications (IEEE NCA05), Cambridge, MA, USA, IEEE Computer Society, 2005, 119, 127
Context-aware applications rely on the ability to perceive
the state of the surrounding environment. In this paper, we
address a class of such applications where real-time guarantees
are required on top of mobile ad hoc networks. While
guaranteed timeliness is a critical requirement, the unpredictability
of dynamic wireless networks adversely impacts
such guarantees. Therefore, we identify the challenges and
the requirements on different architectural levels in order to
provide timeliness guarantees. None of the existing systems
have succeeded in providing adequate solutions to all of
the identified requirements. Therefore, we describe a crosslayer
architecture that supports the development of real-time
context-aware applications for wireless networks, in particular,
ad hoc networks.
This cross-layer architecture is based on three main components.
(i) Sentient objects - mobile intelligent software agents
that extract, interpret and use context information. (ii) Eventbased
real-time middleware supports communication between
sentient objects and provides hard real-time guarantees within
adaptable geographic spaces. (iii) A real-time routing and
resource reservation protocol attempts to discover and maintain
real-time constrained routes within these proximities in a
multi-hop ad hoc network.
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