Design of Cooperative Vehicle Safety Systems Based on Tight Coupling of Communication, Computing and Physical Vehicle Dynamics. Yaser P. Fallah , ChingLing Huang, Raja Sengupta , Hariharan Krishnan
Yaser P. Fallah, ChingLingHuang, Raja Sengupta, Hariharan Krishnan
Univ of California, BerkleyUniv of California, Berkley Univ of California, Berkley General Motors R&D
Fig 1: V2V CVS Communication using DSRC
Fig 2: Network Traveler Soft Safety warning system
For a given values of rate R and traffic density ρ, there exists a value of D which
Yields maximum IDR.
For a selected R, an optimal operation can be reached by varying the D value.
Figure 5 Information Dissemination Rate vs. range of transmission for different
transmission rates, ρ=.1
Figure 6 5 Information Dissemination Ratevs. range of transmission for different
transmission rates, ρ=.2
Figure 7 The effect of transmission range (D) and rate (R) choices on channel occupancy (U)
Figure 8 IDR vs. channel occupancy for different values of R(5-115 msg/sec), D(20-400m), and ρ (0.1-0.2
In the relation between IDR and U, For different values of R, D, ρ it can be
observed that all the IDR values fall on a single curve which means that IDR and
U are related.
It means that a controller must be designed to run at an optimal channel occupancy
Where IDR is maximum. (in this case, channel occupancy is 0.6)
Range control algorithm
Controller must maintain U between Umin = 0.4 and Umax= 0.8.
Figure 12 OPNET and SHIFT simulation results for different
traffic scenarios, the proposed range control scheme vs. fixed