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Latency (in seconds)<br />
WAVE/DSRC – Most Suitable Wireless<br />
Communication for Vehicular Safety<br />
• WAVE/DSRC core<br />
– IEEE 802.11p<br />
– IEEE 1609<br />
• Only WAVE/DSRC can<br />
support active safety<br />
0.01<br />
0.02<br />
1.0<br />
2.0<br />
5.9 GHz WAVE/DSRC (.0002 secs)<br />
Active Safety Latency Requirements<br />
Cellular<br />
(1.5 - 3.5 secs)<br />
WiMax<br />
(1.5 - 3.5 secs)<br />
Seconds<br />
Traffic Signal Violation Warning 0.1<br />
Curve Speed Warning 1.0<br />
Emergency Electronic Brake Lights 0.1<br />
Pre-Crash Sensing 0.02<br />
Cooperative Forward Collision<br />
Warning<br />
0.1<br />
Left Turn Assistant 0.1<br />
Lane Change Warning 0.1<br />
Stop Sign Movement Assistance 0.1<br />
3.0<br />
4.0<br />
5.0<br />
10<br />
20<br />
40<br />
60<br />
WiFi 802.11<br />
(3 - 5 secs)<br />
Source: Vehicle Safety Communications Project – Final Report<br />
Bluetooth<br />
(3 - 4 secs)<br />
Terrestrial Digital Radio &<br />
Satellite Digital Audio Radio<br />
(10 - 20 secs)<br />
Two-Way Satellite<br />
(60+ secs)<br />
Copyright 2013 ITRI 工 業 技 術 研 究 院<br />
ITRI CONFIDENTIAL DOCUMENT DO NOT COPY OR DISTRIBUTE<br />
6
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