SAI: Safety Application Identifier Algorithm at MAC Layer for Vehicular Safety Message Dissemination Over LTE VANET Networks

Table 2

Safety application requirements and SAIs.

Safety application	Message type	Transmitted data	Critical latency	Transmission frequency	Transmission range	SAI
Intersection collision warning	CAM	Vehicle type, position, heading, velocity, acceleration, yaw rate	100 ms	10 Hz	150 m	1
Lane change assistance	CAM	Position, heading, velocity, acceleration, turn signal status	100 ms	10 Hz	150 m
Cooperative forward collision warning	CAM	Vehicle type, position, heading, velocity, acceleration, yaw rate	100 ms	10 Hz	150 m
Slow vehicle indication	CAM/DENM	Vehicle type, position, heading, acceleration, velocity	100 ms	2 Hz	200 m	2
Traffic light speed advisory/violation	CAM/DENM	Signal phase, timing, position, direction, road geometry	100 ms	2 Hz	150 m	3
Motorcycle approaching indication	CAM	Vehicle type, position, heading, velocity	100 ms	2 Hz	150 m
Overtaking vehicle warning	CAM	Position, velocity, yaw rate, acceleration	100 ms	10 Hz	300 m	4
Head on collision warning	CAM	Vehicle type, position, heading, velocity, acceleration, yaw rate	100 ms	10 Hz	200 m	5
Collision risk warning	CAM/DENM	Vehicle type, position, heading, velocity, acceleration, yaw rate	100 ms	10 Hz	300–500 m	6
Emergency vehicle warning	CAM/DENM	Position, heading, velocity, acceleration	100 ms	2 Hz	300 m	7
Cooperative merging assistance	CAM	Curve location, curvature, slope, speed limit, surface	1000 ms	1 Hz	250 m	8
Speed limits notification	CAM	Velocity, acceleration, position, speed limit, heading	100 ms	1–10 Hz	300 m	9