Over the past several years DSRC, as well as the V2X, were the only technologies which were available. The production of DSRC based vehicle to everything technology began in the US and Japan in 2017 after a lengthy period of multiple large-scale field testing. It would be difficult for a layperson to understand DSRC and CV2X chipsets and technologies unless he or she made an attempt to learn how the DSRC vs CV2X should be differentiated.
CV2X is being introduced with the same purpose of communicating directly with vehicles. This technology is defined as 3GPP which is based on the cellular modem technology and leads to a fundamentally different non-interoperable access layer with DSRC. Apart from that these two chipsets and technologies the address similar use cases with an identical network, application layers and security.
DSRC based vehicle to everything technology has been deployed in the US, Europe, and Japan even as the CV2X is gaining popularity in other regions. The general properties of DSRC, as well as the CV2X along with their commonalities and differences between the usability, are mentioned below for your reference. The technical comparison is also mentioned thereafter to give you a better idea about DSRC vs CV2X.
The objective of DSRC 802.11 P was to ensure direct real-time safety communication between vehicles to users of the road as well as vehicles to infrastructure. It was initially deployed in 2017 and has been slated for mass deployment in 2019. DSRC is a hybrid model which can be used with any cellular network including 4G or 5G for non-safety services and is self-managed.
DSRC has a dedicated camera which has a traffic light based infrastructure which can enhance safety. The roadmap for this technology is targeting interoperability with 802.11 P but has the port engine to create a cybersecurity risk because it lacks the ability to isolate V2X from the non-safety domain.
DSRC and CV2X are both rooted from different chipsets and technologies and lead to fundamentally non-similar operational methods. DSRC which is derived from Wi-Fi is optimized to be cost-effective and simple and therefore supports distributed operation. CV2X is derived from LTE and has added new mechanisms in order to enable distributed operation with the help of mode 4. The technical properties of DSRC and the CV2X technologies are as follows.
While the DSRC 802.11 P originates from Wi-Fi which is modulated by the OFDM which is capable of copying occasional long packets it does not have the ability to provide concurrent transmissions and the time synchronization of the same is loose asynchronous. On the other hand, the CV2X has an LTE uplink and is modulated by SC-FDM. The transmission time of this technology is about 1 ms which increases the energy per bit for communication ranges which are long. It has a higher processing gain for long communication range. The transmission scheduling is semi-persistent giving it the ability to sense the least occupied resource. It does not have the ability to sense collisions and responds slowly to the changing environment. The time synchronization of CV2X has tight synchronous requirements and therefore the average layperson cannot be under the impression that the technologies are similar because they are both different.
When comparing DSRC vs CV2X it must be understood that multidimensional factors need to be considered by taking into account the impact of every parameter which should be analyzed according to the properties of the vehicle to vehicle operation as it has been defined by the needs of the upper layers and applications of the vehicle to vehicle operations.
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