Cross Layer QoS Implementations: The Clean-Slate Approach

Cross Layer QoS Implementations: The Clean-Slate Approach

Virgil Dobrota (Technical University of Cluj-Napoca, Romania) and Andrei Bogdan Rus (Technical University of Cluj-Napoca, Romania)
Copyright: © 2012 |Pages: 41
DOI: 10.4018/978-1-4666-0960-0.ch003
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Quality of service has been an open issue from the beginning, due to the Internet paradigm of delivering the datagrams as simple as possible, on a hop-by-hop basis. As an answer to the inefficiency of the legacy solutions, rethinking of Internet principles brought among other ideas the self-management. Based on a clean-slate approach applied within FP7-4WARD project, this chapter proposes preliminary design and implementation of a key management capability of the near Future Internet, i.e. Cross-Layer QoS. Its applications are focused on congestion control (triggering activation of network-coding techniques) and QoS-aware routing based on a modified Dijkstra’s algorithm.
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The classical approach where the communication protocols worked independently from each other was suitable for non real-time applications running over wired networks. In what concerns real-time services, the previously mentioned paradigm proved to be unsatisfying. A certain degree of adaptation is necessary to optimize the execution of high-level applications or protocols, using information received from the lower layers. In this section, we discuss first about the information exchanged between the layers through cross-layer techniques. Examples according to evolutionary approach are accompanying the survey, the material being organized with respect to the OSI Layer the information is acquired from. Later we commented the role of the clean-slate approach with respect to the step-by-step strategy of progress is this field.

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