Distributed information management and publish/subscribe in VANETs: requirements, state of the art and a novel P2P-based approach

  • Authors:
  • Vivian Prinz;Michele Brocco;Wolfgang Woerndl

  • Affiliations:
  • Department of Informatics, Technische Universität München, Garching, Germany;Department of Informatics, Technische Universität München, Garching, Germany;Department of Informatics, Technische Universität München, Garching, Germany

  • Venue:
  • Journal of Mobile Multimedia
  • Year:
  • 2009

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Abstract

Wireless communication is particularly powerful in vehicular ad hoc networks (VANETs) as it implies important possibilities to enhance traffic safety. For this purpose, a car-to-car (C2C) communication system should provide distributed information management. For example, it should guarantee the availability of a black ice warning for the duration of its validity. In addition, the Publish/Subscribe (Pub/Sub) paradigm allows for information filtering and tracking of changes in the information environment. Thus, vehicles could monitor traffic changes, for example. This article introduces the application of structured peer-to-peer (P2P) algorithms and P2P/Distributed Hash Table (DHT)-based Pub/Sub for the named functionalities. To allow for their application given high mobilities and to provide location-awareness, the vehicular network is segmented into separate, interacting P2P networks. Cars manage information of their own segment and exchange them between adjacent segments if necessary. The Pub/Sub functionality is built on top of the P2P segments' DHTs. This way, Pub/Sub can be applied as there is no need to maintain a vehicular broker tree. The proposed solution enables C2C applications to publish information referring to certain areas or validity durations. In addition, they can request, modify and delete this information and solely interested vehicles can be notified about these events.