A broadcast scheme for vehicle-to-pedestrian safety message dissemination

Abstract

Ensuring cooperative awareness by periodic message beaconing in vehicular environments is necessary to address pedestrian safety. However, high periodic basic safety message broadcasting in dense vehicular environments makes accessing the communication channel very competitive. Furthermore, high-frequency periodic broadcasting causes fast device energy dissipation which is a key issue for small computing devices used in wireless sensor and mobile communications. Therefore, in order to achieve reliable message dissemination for vehicle-to-pedestrian safety, energy loss minimization mechanisms for pedestrian mobile devices should be developed. This article proposes controlling the number of broadcasts by eliminating periodic safety message broadcasts from pedestrian nodes; these nodes only receive broadcasts from vehicles and then conditionally communicate with the vehicles when safety alerts are raised. When the pedestrian nodes do not receive messages from any vehicle for a specified period, pedestrian nodes broadcast a high-priority message advertising their position. Furthermore, for the pedestrian, adaptive message emission rates and transmission duration are proposed based on defined vehicle-to-pedestrian separation distances. This approach reduces the pedestrian device energy consumption and end-to-end delay and improves the packet delivery ratio compared to the vehicular broadcast approach for safety messages defined in the IEEE 802.11 standard.

Research on adaptive beacon message broadcasting cycle based on vehicle driving stability

“…Marc et al 33 proposed a distributed transmit power control method distributed fair power adjustment for vehicular environments (D-FPAV) based on strict fairness criteria for controlling the load of periodic messages on the channel. It provides bandwidth for higher priority data, such as issuing warnings; it also treats beacons from different vehicles equally, ensuring the best possible reception under the available bandwidth constraints.…”

Time Barrier-Based Emergency Message Dissemination in Vehicular Ad-hoc Networks

“…Similar delay based broadcasting techniques are also adopted for pedestrian safety from car accidents. In these scenario vehicles/pedestrians need to be alerted about the situation at the earliest [11], [16]. In [32], a clustering scheme based on the direction of vehicles is presented.…”

Weighted Adaptive Opportunistic Scheduling Framework for Smartphone Sensor Data Collection in IoT

“…Moreover, we consider a heterogeneous smartphone mobility scenario that involves both vehicular mobility (where smartphone users are traveling in vehicles) and pedestrian (users are on foot) mobility. Researchers have proposed and considered heterogeneous mobility scenarios, such as a vehicle-to-pedestrian broadcasting algorithm based on the Manhattan mobility model (vehicular mobility model) and the SLAW model (human mobility model) [28]. However, our proposed scheduling framework collects data from smartphones under heterogeneous mobility scenario and can be easily applied to support various data collection application scenarios.…”