"Would Self-Organized or
Self-Managed Networks Lead to Improved QoS?
Panel Convener
David Hutchison, Lancaster
University, UK
Panellists
Gísli Hjálmtýsson, Reykjavík University, Iceland,
Mikhail Smirnov, FhG Fokus, Berlin,
Germany, James P.G. Sterbenz, University
of
Massachussets, Amherst, USA, Giorgio Ventre, University of Napoli, Italy, John
Vicente, Intel Corporation, USA
Background
Quality of Service (QoS) is an often misunderstood term. The
International Standardisation (ISO) efforts of the early 1990s on a QoS
Framework showed that there are several QoS aspects, the most
significant being performance, availability and security. Ultimately,
the most important consideration is that the service provided (by
whatever system is providing it) is for the benefit of the user. Most
of the research effort in subsequent decade has been on the performance
aspect (including, rightly, perceptual QoS), but unfortunately the
other aspects have largely been ignored or overlooked. Both
availability and security have a central role to play in ensuring the
overall QoS of a networked system. Should either of these be
compromised, there will be a fairly direct and negative impact on the
system performance: this is a particularly topical issue.
In recent years several events have shown how current networked systems
are vulnerable to a wide variety of threats and failures. Malicious and
terrorist attacks (hits to telecommunication and IT infrastructures,
worms and Denial of Service attacks) as well as failures related to
external events (natural disasters, major outages of electrical power)
can lead to critical situations for the life of the current and the
future Information Society. The interdependencies existing across all
the components (hardware, software, support infrastructure) of complex
networked systems demand a new approach to the definition of proper
design and evaluation methodologies of fault and attack resilience
capabilities. Even router mis-configurations may be a major source of
disruption in the network, emphasising the urgent need for appropriate
resilience mechanisms.
Resilience – the ability of a system to recover to acceptable levels of
operation following failures or attacks – is therefore a key QoS
characteristic that has a direct impact on the system's performance.
The Proposition
This panel debates the following proposition: self-organization or
self-management can help implement networked systems resilience and
therefore provide improved QoS for end-users.
Related issues likely to be covered include:
- what is our definition of QoS and which layer(s) are significant?
- what is the difference between self-organization and self-management
in this context? |