A Structure-free Aggregation Framework for Vehicular Ad Hoc Networks

1. A Structure-free Aggregation Framework for Vehicular Ad Hoc Networks Stefan Dietzel, ElmarSchoch, BotoBako, Frank Kargl

2. Outline • Introduction and Contribution • Motivation • Fuzzy Reasoning System • System Architecture • Simulation Results

3. Introduction and Contribution • Data Aggregation in VANET • The challenge of aggregation lies in the proper decision if two single data items should be aggregated or not. • Contribution It is not necessary to define aggregate structures such as hierarchical grids or fixed road segments or to establish a processing structure like a hierarchy or a group of nodes.

4. Motivation: DA in WSN not suitable • In a highly dynamic network like VANETs, building such hierarchies is not feasible or would at least result in high communication overhead. • VANET applications like collaborative detection and dissemination of traffic congestions require periodic status information over road conditions in order to work properly. • Drawbacks of pre-defined aggregation structure: This requires that vehicles have a common knowledge about the road network and its segmentation which is problematic regarding the variety of VANET applications.

5. A reduction of the information accuracy with increasing distance is not always an appropriate solution.

6. Fuzzy Set Systems

8. System Architecture

9. Simulation