RFDSRC vs C-V2X: Key Differences Explained
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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.
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:
| 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 |
| Communication Range | N/A | Increasing energy per bit for long communication range |
| Concurrent transmissions | No | Yes |
| Range Issues | Decreasing range due to “Half-Duplex” and “Near-Far” problems | N/A |
| 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 |
| Retransmission | 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 |
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