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

Table 1

Safety application requirements.

Safety application	Message type	Communication mode	Minimum frequency	Critical latency	Transmission range
Intersection collision warning	CAM	Broadcasting periodic messages	10 Hz	100 ms	150 m
Lane change assistance	CAM	Cooperation awareness between vehicles	10 Hz	100 ms	150 m
Slow vehicle indication	CAM/DENM	Broadcasting state periodically	2 Hz	100 ms	200 m
Traffic light speed advisory/violation	CAM/DENM	Broadcasting periodic messages	2 Hz	100 ms	150 m
Overtaking vehicle warning	CAM	Broadcasting overtaking state	10 Hz	100 ms	300 m
Head on collision warning	CAM	Broadcasting periodic messages	10 Hz	100 ms	200 m
Collision risk warning	CAM/DENM	Time limited periodic messages on event	10 Hz	100 ms	300–500 m
Cooperative forward collision warning	CAM	Cooperation awareness between vehicles	10 Hz	100 ms	150 m
Emergency vehicle warning	CAM/DENM	Broadcasting periodic messages	10 Hz	100 ms	300 m
Cooperative merging assistance	CAM	Cooperation awareness between vehicles	1 Hz	1000 ms	250 m
Speed limits notification	CAM	Broadcasting periodic messages	1–10 Hz	100 ms	300 m
Motorcycle approaching indication	CAM	Cooperation awareness between vehicles	2 Hz	100 ms	150 m