Terminology » 5G » DSRC vs C-V2X: Key Differences Explained

DSRC vs C-V2X: Key Differences Explained

dsrc c-v2x vehicle communication wireless technology autonomous driving

This article compares DSRC (Dedicated Short-Range Communications) and C-V2X (Cellular Vehicle-to-Everything), highlighting the key differences between the two technologies.

What are C-V2X and DSRC?

Introduction:

C-V2X, or Cellular Vehicle-to-Everything, is a communication technology that encompasses V2V (Vehicle-to-Vehicle), V2P (Vehicle-to-Pedestrian), V2I (Vehicle-to-Infrastructure), and V2N (Vehicle-to-Network) communications. It is designed to meet the requirements of autonomous vehicles and ensure safe autonomous driving.

  • V2P: Vehicle to Pedestrian
  • V2V: Vehicle to Vehicle
  • V2N: Vehicle to Network
  • V2I: Vehicle to Infrastructure

C-V2X has been implemented in various standards, including:

  • 802.11p/C-V2X R14: Incorporates basic safety features.
  • C-V2X R14: Includes enhanced safety features.
  • C-V2X R15+: Designed for advanced safety applications.

C-V2X network

DSRC, on the other hand, is derived from Wi-Fi technology. Both DSRC and C-V2X aim to address similar use cases and share comparable network, security, and application layers. However, due to their distinct origins, notable differences exist.

DSRC vs. C-V2X: A Detailed Comparison

The following table presents a comparison between DSRC and C-V2X based on various parameters:

ParametersDSRCC-V2X
Origin technology802.11p WiFiRel.14/Rel.15, LTE Uplink
ModulationOFDMSC-FDM
Transmission TimeVarying according to packet length, Typically 0.4 msCapable of copying occasional long packets 1mS
Communication RangeN/AIncreasing energy per bit for long communication range
Concurrent transmissionsNoYes
Range IssuesDecreasing range due to “Half-Duplex” and “Near-Far” problemsN/A
Symbol duration8 µSFast Channel Tracking 71 µS
Line codingConvolution codeTurbo code, High processing gain for long communication range
Transmission schedulingCSMA: Transmit when no ongoing receptionNo pre-determined transmission slots fitting facilities layer per cycle decision whether to transmit. Semi-persistent sensing of least occupied resource collisions aren’t sensed. Slow response to changing environment
RetransmissionNoneYes. Typically activated in high speed. Overcoming network collisions and increasing communication range
Time SynchronizationLoose AsynchronousVery tight Synchronous requirements
DeploymentSince 2017, Mass market in 2019Initial deployments in 2021

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