Crash Risk-Based Prioritization of Basic Safety Message in DSRC

Abstract

Dedicated short-range communications (DSRC) is one of the key technologies enabling safety-critical applications for intelligent transportation system (ITS). Considering the significance of such safety-of-life applications, it is of utmost importance to guarantee reliable delivery of basic safety messages (BSMs). However, in accordance with a V2X network being inherently dynamic in key aspects such as vehicle density and velocity, the networking behavior of a DSRC system is usually highly complicated to analyze. In addition, the United States Federal Communications Commission (US FCC) recently proposed the so-called "5.9 GHz band innovation," which includes a plan to reduce bandwidth for DSRC to 10 MHz at best from 75 MHz. Motivated from these challenges, the necessity of "lightening" load of a DSRC network has become essential to keep safety-related operations from performance deterioration. To this end, this paper proposes a protocol that prioritizes transmission of a BSM from a vehicle according to the level of accident risk of the vehicle. The proposed protocol uses the distance of a vehicle from a danger source as the metric to determine the priority for transmission. Our results show that this protocol effectively prioritizes the transmission opportunity for dangerous vehicles, and hence results in higher performance in terms of key metrics-i.e., average latency, packet delivery rate (PDR), and inter-reception time (IRT).

Federated Learning Enabled SDN for Routing Emergency Safety Messages (ESMs) in IoV Under 5G Environment

“…The protocol controls the collisions by setting the transmission powers dynamically based on the transmission ranges and thus achieves a high QoS for safety applications. The protocol proposed in [63] was used to alleviate the burden of DSRC and guarantee reliability. The protocol prioritizes the ESM transmission from a vehicle based on accident risk evaluation, which calculates the distance between the vehicle and the danger zone and hence transmits ESMs with higher reliability.…”

On the Byzantine-Fault-Tolerant Consensus for Blockchain among Connected Vehicles

“…For instance, λ N = 6 yields that the majority of consensuses are formed with a latency of {250,500,1000} msec. The same can be applied to the dedicated short-range communications (DSRC), which sets the inter-message time to 100 msec [16].…”

Is 30 MHz Enough for C-V2X?

“…Now, in regard to the characterization of a V2X system, the literature introduced a wide variety of proposals. Several approaches were compounded into large bodies such as theoretical/mathematical approaches [5]- [7], simulation-based [8] [9], and channel sounding-based [10]. Even reinforcement learning has been applied as a means to characterize a highly dynamic vehicular network [11]- [14].…”