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Reducing Message Collisions in Sensing-Based Semi-Persistent Scheduling (SPS) by Using Reselection Lookaheads in

Yongseok Jeon1, Seungho Kuk2, Hyogon Kim3

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To reduce message collisions in C-V2X sidelink Mode 4, a new "lookahead" method is proposed. This technique significantly lowers packet collisions by sharing future resource scheduling information between vehicular user equipment (UEs).

Keywords:
cellular V2X (C-V2X)message collision resolutionsemi-persistent scheduling (SPS)sensing-based

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Area of Science:

  • Wireless Communication
  • Telecommunications Engineering
  • Vehicular Technology

Background:

  • Current sensing-based semi-persistent scheduling (SPS) in C-V2X sidelink Mode 4 struggles with wireless channel congestion.
  • Existing mechanisms result in frequent packet collisions, impacting high-reliability C-V2X applications like autonomous driving.

Purpose of the Study:

  • To significantly reduce message collisions in C-V2X sidelink Mode 4.
  • To enhance the reliability of vehicular communications for future applications.

Main Methods:

  • Proposing a novel "lookahead" mechanism to reduce resource selection uncertainties.
  • Exchanging "lookahead" information piggybacked on periodic safety messages between vehicular user equipment (UEs).

Main Results:

  • The proposed "lookahead" scheme drastically reduces message collisions in C-V2X sidelink Mode 4.
  • Vehicular UEs can mitigate collisions by being aware of other UEs' scheduling decisions.

Conclusions:

  • The "lookahead" method effectively addresses packet collisions in C-V2X sidelink Mode 4.
  • Despite a minor bandwidth cost for control packet inclusion, the benefits for C-V2X reliability are substantial.