Increasing vehicles perception using cooperative relaying and priority-based beaconing

Abstract

The use of vehicle's on-board sensors in increasing the perception of cooperative vehicles is becoming prevailing and essential for the road safety. However trusting only on the on-board sensors could limit the perception of the cooperative vehicles for example an object/vehicle can not be detected if it is impeded by some obstruction. The perception efficiency of vehicles can be increased beyond their field of view (FoV) by exchanging the sensor detected information through V2X communication. The perception of vehicles can be more accurate as much as frequent they share the information. However by transmitting numerous messages could saturate the communication channel and deteriorate the perception improvement specially in the dense circumstances. In this paper we address both these issues and propose two different schemes, (i) an information propagating mechanism to increase the cooperative vehicle's perception above their FoV and (ii) an optimal dynamic cooperative priority based beaconing model to coup with the channel congestion. By using the information propagation mechanism we can increase the perception of cooperative vehicles up to their maximum communication range and on the other end probability based dynamic cooperative priority beaconing scheme selects the most suitable cooperative vehicle to transmit based on its on-board sensor facility. These proposed mechanisms immensely decrease the contention on the channel while extend the perception beyond the FoV. We evaluate both the mechanisms for the performance in terms of vehicles awareness, channel load and communication range through simulations for several vehicle densities. The simulation results show that these proposals provide better performance compare to the classical beaconing schemes.

Analyzing and Optimizing Extended-CAM Service Using Simple Stochastic Geometry Model

“…In contrast to the previous studies that focused on varying data rates or transmission power to reduce channel load and improve CAM transmission in the neighborhood, we propose in a previous study an alternative solution based on cooperative transmission [1], [2]. This solution keeps the data rate and transmission power unchanged.…”

“…An alternative solution involves employing additional detection techniques, such as sensors or visible light communication units, to gather information about neighboring vehicles, including their speed and position. By incorporating this extra information, vehicles can send Extended CAM messages that encompass their own speed and position and that of nearby vehicles [1], [2]. Despite Extended CAM messages containing more data than simple CAM messages, they help conserve bandwidth by avoiding the constant overhead present in each message.…”