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Enabling adaptation in cooperative vehicles by mapping the radio environment
Örebro University, School of Science and Technology. (Centre for Research on Embedded Systems (CERES))
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This paper presents how requirements on vehicle-to-vehicle communication quality and coverage can be expressed and monitored in a cooperative traffic system. The aim is to enable radio environment awareness and create applications that can adapt earlier to communication failures caused mainly by static obstacles such as terrain or buildings. A mechanism for collaborative mapping of experienced communication quality is proposed as well as a method for comparing the resulting radio map to the application requirements using a novel communication requirements specification format that takes both coverage and message inter-arrival time into account. The mapping procedure utilizes logs of periodically broadcasted cooperative awareness messages sent by vehicles and does not require any new inter-vehicle message types or contents. Vehicles upload logs for centralized aggregation and Bloom filters are used to reduce log size and upload bandwidth requirements. Results from packet-drop measurements in urban and rural scenarios in conjunction with analytical bounds on log and map size show that cooperatively mapping the radio environment is feasible. Although the main aim is on-line adaptation the proposed scheme is also applicable during application design stages and as a decision support tool for road-side unit deployment.

National Category
Computer Sciences
Research subject
Computer and Systems Science
Identifiers
URN: urn:nbn:se:oru:diva-21431OAI: oai:DiVA.org:oru-21431DiVA, id: diva2:487315
Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2018-01-12Bibliographically approved
In thesis
1. Situation-aware vehicles: supporting the next generation of cooperative traffic systems
Open this publication in new window or tab >>Situation-aware vehicles: supporting the next generation of cooperative traffic systems
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wireless communication between road vehicles enables a range of cooperative traffic applications including safety, efficiency and comfort functions. A common characteristic of the envisioned applications is that they act on environmental information to intepret traffic situations in order to provide the driver with warnings or recommendations. In this thesis we explore both the detection of hazardous traffic situations in order to provide driver warnings but also the detection of situations in which the cooperative system itself may fail.

The first theme of this thesis investigates how traffic safety functions that incorporate cooperatively exchanged information can be constructed so that they become resilient to failures in wireless communication. Inspired by how human drivers coordinate with limited information exchange, the use of pre-defined models of normative driver behavior is investigated by successfully predicting driver turning intent at an intersection using mobility traces extracted from video recordings. Furthermore a hazardous driving warning criterion based on model switching behavior is proposed and evaluated through test drives. Maneuvers classified as hazardous in the tests, such as swerving between lanes and not braking for traffic lights, are shown to be correctly detected using the criterion. Whereas robust coordination mechanisms may mask communication faults to some degree, severe degradations in communication are still expected to occur in non-line-of-sight conditions when using wireless communication at 5.9 GHz.

The second theme of the thesis explores how communication performance can be efficiently logged, gathered and aggregated into maps of communication quality. Both in-network aggregation as well as centralized aggregation is investigated using vehicles in the network as measurement probes and the feasibility of the approach in terms of bandwidth and storage requirements is shown analytically. In conjunction with a proposed communication quality requirements format, tailored specifically for vehicle-to-vehicle applications, such maps can be used to enable application-level adaptation in response to situations where quality requirements likely cannot be met.

Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2012. p. 47
Series
Örebro Studies in Technology, ISSN 1650-8580 ; 52
National Category
Natural Sciences Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:oru:diva-21338 (URN)978-91-7668-846-5 (ISBN)
Public defence
2012-02-12, Högskolan i Halmstad, Hörsal Wigfors, Halmstad, 13:15
Opponent
Supervisors
Available from: 2012-01-30 Created: 2012-01-26 Last updated: 2018-01-12Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf