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DSRC vs C-V2X | Difference between DSRC and C-V2X

This page compares DSRC vs C-V2X and mentions difference between DSRC and C-V2X.

What are C-V2X and DSRC ?

Introduction:
C-V2X refers to Cellular Vehicle to Everything. It includes V2V, V2P, V2I and V2N. It fulfills requirements of autonomous vehicle and safe autonomous driving. V2P stands for Vehicle to Pedestrian, V2V stands for Vehicle to Vehicle, V2N stands for Vehicle to Network and V2I stands for Vehicle to Infrastructure.

C-V2X has been introduced in various standards. 802.11p/C-V2X R14 incorporates basic safety, C-V2X R14 incorporates enhanced safety and C-V2X R15+ incorporates advanced safety.

C-V2X network

DSRC is derived from wifi. Both DSRC and C-V2X address the same use cases. They both have similar network layer, security layer and application layer. Due to their origin technologies there are differences between them.

Following table mentions comparison between DSRC and C-V2X based on various parameters.

Parameters DSRC C-V2X
Origin technology 802.11p WiFi Rel.14/Rel.15, LTE Uplink
Modulation OFDM SC-FDM
Transmission Time Varying according to packet length, Typically 0.4 ms
Capable of copying occasional long packets
1mS
Increasing energy per bit for long communication range
Concurrent transmissions No Yes
Decreasing range due to "Half-Duplex" and "Near-Far" problems
Symbol duration 8 µS
Fast Channel Tracking
71 µS
Line coding Convolution code Turbo code,
High processing gain for long communication range
Transmission scheduling CSMA: Transmit when no ongoing reception
No 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
Ratransmission None Yes. Typically activated in high speed. Overcoming network collisions and increasing communication range
Time Synchronization Loose Asynchronous Very tight Synchronous requirements
Deployment Since 2017, Mass market in 2019 Initial deployments in 2021

Reference : Visit Autotalks (https://www.auto-talks.com/) for more information.

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