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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
1Department of Computer Science and Engineering, Korea University, Anam-Dong, Sungbuk-Gu, Seoul 02841, Korea. ysjeon741@korea.ac.kr.
Sensors (Basel, Switzerland)
|December 15, 2018
Summary
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).
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.
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