Browse Publications Technical Papers 2019-01-0102
2019-01-16

Evaluation of V2V Reception Cadence- A New Metric for System Level Performance Analysis 2019-01-0102

Vehicle to Everything (V2X) communication is a prominent solution for active safety collision avoidance and for providing autonomous vehicles Non-Line of Sight (NLOS) capabilities. For safety purposes, it is essential the V2X technology would support communication between all road users, e.g., Vehicles (V2V), pedestrians (V2P) and road infrastructure (V2I). Considering this aspect, the efficiency of a V2V communication solution should be evaluated through system level performance. In addition, the examined performance metrics need to reflect the communication technology’s safety related properties. Metrics as Packet Reception Ratio (PRR) and transmission latencies, which are commonly used to assess V2X system’s functionality, aren’t enough since they don't necessarily describe the system’s reception latencies. The latter is crucial for ensuring messages would reach their destination on time to avoid hazardous incidents. While the transmission cadence of Basic Safety Messages (BSM) is 10Hz (every vehicle broadcasts its status every 100ms) the reception cadence may be much lower due to various phenomenon (e.g. channel congestion). Still, 10Hz may not be the required reception cadence: As distance between vehicles increases, their mutual impact safety wise is potentially reduced. Meaning, the reception cadence requirements of BSMs can potentially be loosened. In this paper, we present a metric called CD-PRR (Cadence Dependent PRR) - a generalization of the PRR. It calculates PRR based on the reception cadence the system should support per range. The metric fuses the impact of the system’s PRR performance and transmission latencies and provides better understanding of the system reception latencies. Metric’s performance is presented for several scenarios using DSRC technology and based on the results some conclusions are drawn. CD-PRR is an example of automotive related metrics. We propose that based on the automotive needs a specific metrics set would be designed and applied for the V2X safety messages.

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