Temporal data dissemination in vehicular cyber-physical systems

Kai Liu*, Victor Chung Sing Lee, Joseph Kee Yin Ng, Jun Chen, Sang Hyuk Son

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

53 Citations (Scopus)
4 Downloads (Pure)


Efficient data dissemination is one of the fundamental requirements to enable emerging applications in vehicular cyber-physical systems. In this paper, we present the first study on real-time data services via roadside-to-vehicle communication by considering both the time constraint of data dissemination and the freshness of data items. Passing vehicles can submit their requests to the server, and the server disseminates data items accordingly to serve the vehicles within its coverage. Data items maintained in the database are periodically updated to keep the information up-to-date. We present the system model and analyze challenges on data dissemination by considering both application requirements and communication characteristics. On this basis, we formulate the temporal data dissemination (TDD) problem by introducing the snapshot consistency requirement on serving real-time requests for temporal data items. We prove that TDD is NP-hard by constructing a polynomial-time reduction from the Clique problem. Based on the analysis of the time bound on serving requests, we propose a heuristic scheduling algorithm, which considers the request characteristics of productivity, status, and urgency in scheduling. An extensive performance evaluation demonstrates that the proposed algorithm is able to effectively exploit the broadcast effect, improve the bandwidth efficiency, and enhance the request service chance.

Original languageEnglish
Article numberA6
Pages (from-to)2419-2431
Number of pages13
JournalIEEE Transactions on Intelligent Transportation Systems
Issue number6
Early online date13 May 2014
Publication statusPublished - Dec 2014

Scopus Subject Areas

  • Automotive Engineering
  • Mechanical Engineering
  • Computer Science Applications

User-Defined Keywords

  • Data dissemination
  • real-time scheduling
  • temporal consistency
  • vehicular cyber-physical system (VCPS)


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