Improving Information Age in SAE J2945 Congestion-Controlled Beaconing

Sungheon Lim, Hyogon Kim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The Society of Automotive Engineers J2945 standard prescribes a wireless channel congestion control algorithm for basic safety messages in vehicular safety communication. The algorithm utilizes transmit (Tx) power and rate controls, but we find that the Tx power control hardly engages in most practical vehicular traffic densities. We explain the cause and propose an alternative way to utilize both the control mechanisms. Specifically, we suggest that the Tx power control be first exerted to its limit, followed by the Tx rate control coping with further congestion. We show that the proposed alternative not only addresses the inadequate power control issue but also leads to better information age performance for vehicles in the most safety-critical distances.

Original languageEnglish
Article number8588986
Pages (from-to)358-361
Number of pages4
JournalIEEE Communications Letters
Issue number2
Publication statusPublished - 2019 Feb

Bibliographical note

Funding Information:
Manuscript received October 31, 2018; revised December 17, 2018; accepted December 20, 2018. Date of publication December 25, 2018; date of current version February 11, 2019. This research was supported by a grant(18CTAP-C133064-02) from Technology Advancement Research Program (TARP) funded by Ministry of Land, Infrastructure and Transport of Korean government. The associate editor coordinating the review of this paper and approving it for publication was E. Bastug. (Corresponding author: Hyogon Kim.) The authors are with Korea University, Seoul 136-701, South Korea (e-mail: [email protected]). Digital Object Identifier 10.1109/LCOMM.2018.2889666

Publisher Copyright:
© 1997-2012 IEEE.


  • BSM
  • SAE J2945
  • Tx power control
  • congestion control
  • information age

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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