CSIM Objectives

Notes

CAVWAY Simulation (CSIM) Objectives
  1. Define and document CAV-System requirements;
  2. Characterize CAV-System standards including CAV, CAVWAY, node, CC, navigation, and CAVNET functions, protocols, and interfaces;
  3. Expose critical-experiments needed to validate required CAV operating capabilities such as navigating, sensing, changing lanes, maintaining speed, and monitoring self-health;
  4. Verify that CAVNET, using packet-switching, can enable CAVWAY nodes to monitor loading and control access under normal conditions and enable the CC and CAVs to meet timing requirements imposed by abnormal conditions;
  5. Characterize potential abnormal CAVWAY conditions and model and compare emergency-response approaches;
  6. Address external and internal security risks and risk mitigation;
  7. Model a range of traffic loads and compare the effectiveness of candidate access and congestion-pricing algorithms; and
  8. Measure traffic flow and access-control effectiveness under abnormal conditions such as the presence of faults, malfunctions, and damage.
Risk inherent in simulation
Since simulation carries the risk of masking complexity, the simulation writer must strive to move beyond modeling the ideal performance of the target system. For example, when modeling a system within a software program on a single computer, it is easy to emulate the perfectly executed exchange of messages among geographically separated components. However, unless care is taken to account for physical layer factors such as interference, transmission power, and antenna quality, the simulation may fail to reveal important characteristics of real system performance. This is one reason that critical experiments are essential to realistic prototyping.
One benefit of unambiguously characterizing requirements and standards is a resulting clear record of design decisions.



Some critical experiments, e.g., CAV control and sensing, are being performed daily out in the world, thus reducing the need to validate such functions expressly for CAV Systems.

The packet-switching network protocol and the CAV lane-change protocols enable CAV coordination without compromising CAV autonomy.





Objectives 6, 7, and 8 (at left) have not yet been implemented in CSIM.