GMSL vs Automotive Ethernet for LiDAR point cloud data

Gigabit Multimedia Serial Link (GMSL) and Automotive Ethernet are both technologies used in vehicles

GMSL

GMSL is a serial link technology used for video distribution in cars. It can transport multi-megapixel images without compression, which is useful for safety features like object and pedestrian detection. GMSL is also used for high-speed data transmission (streaming) in industrial applications.

Automotive Ethernet

A specialized form of Ethernet network that enables high-speed data transfer between different car components. It uses a single pair of unshielded twisted wires for lightweight and low cost.



When transmitting LiDAR point cloud data over a network, choosing between TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) depends on your specific data integrity, speed, and complexity requirements.


TCP is a connection-oriented protocol, ensuring that all packets arrive in order and are error-free:
- Reliability: TCP provides built-in error checking and guarantees the delivery of data in the order it was sent. It is crucial when you need complete and accurate data, such as when constructing detailed and precise 3D models.
- Overhead: This reliability comes with a higher overhead, meaning more data is used to ensure the integrity and order of packets, which can reduce the overall transmission speed.


UDP is a connectionless protocol and does not guarantee order or error-checking:
- Speed: UDP is generally faster than TCP because it has lower overhead. It simply sends packets without waiting for confirmation, making it suitable for real-time applications where speed is crucial.
- Loss Tolerance: It's more suitable for situations where losing some data packets is acceptable, such as real-time monitoring or scanning environments where receiving the most current data quickly is more important than having a perfectly complete dataset.


For LiDAR data, if your application demands high accuracy and completeness—for example, in detailed environmental modeling or precise measurements — TCP would be the better choice. If you need fast data transmission for real-time applications, like navigation or object detection in autonomous vehicles, where you can tolerate some data loss, UDP might be more appropriate.


https://en.wikipedia.org/wiki/Gigabit_Multimedia_Serial_Link

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Android in cars

“For now, OnStar is the leader. It has 6 million users, more than 4 million of whom pay an average of $240 a year. Add in the mobile-phone minutes from Verizon that OnStar resells, and the GM unit logs more than $1 billion a year in revenue, with double-digit profit margins. Its staff of 2,200 agents answers 99.7 percent of emergency calls within a second, faster than police 911 agents, OnStar says. 

During GM’s bankruptcy, OnStar was valued between $2 billion and $4 billion.”

References

• http://buswk.co/eBCftl - link is outdated