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INHALTE

The goals

The goals of the Graduate School are to develop mechanisms for the autonomous, dynamic, distributed coordination (self-organization) of future mobile communication systems including ad-hoc and multi-hop systems.

Disaster scenarios

Our main application area are disaster scenarios, i.e. an exceptional and highly dynamic situation covering a wide geographical area. In this case, measures can be applied which are not acceptable under normal operation. An example disaster scenario where several network elements fail, e.g. base stations, routers and wired links, is shown below. As can be easily seen, these failures may result in the unavailability of numerous services and may require various actions.

Strict time requirements and the dynamics of the situation, i.e. continuous shutdown and recovery of components, do not allow for a manual reconfiguration and management. Disasters leave most communication systems in a situation where some services as well as hardware resources are faulty while others are still operational. As almost all applications, e.g. multimedia, conferencing, voice and video, rely on some simple network services, these simple services are as essential as the provision of transport capacities and access to radio resources.

Self-organization

Self-organization supports the autonomous adaptation of systems to dynamically changing environments. The focus on self-organization for disaster communication is motivated by the following attributes of self-organizing system

  • robustness with respect to failures, overload and attacks,
  • scalability with respect to network size, number of subscribers, load and resources,
  • minimal latency to respond to changes, esp. in highly disordered situations, and
  • simplification of management, esp. system setup, operation and extension.