On-demand Quality-of-Service for Crucial Vehicle-to-Pedestrian Communication

摘要

Vehicle-to-Pedestrian safety communication extends the capabilities of vehicle’s on-board driver-assistance systems by establishing cooperative safety communication among vehicles and pedestrians. Such safety communication may involve periodic broadcast of safety messages to the surrounding nodes and also, the peer-to-peer communication between a vehicle and pedestrian on the verge of collision. However, in the presence of a large number of pedestrians, the network can become congested and the safety communication may suffer from degradation in Quality-of-Service. This paper aims to improve the reliability of the peer-to-peer crucial safety communication between the pair of vehicle and pedestrian on the verge of collision. This work proposes a Dedicated Short Range Communication system-based mechanism that informs the surrounding nodes about the ongoing crucial communication and requests them to lower the priority of their safety messages for the subsequent transmissions. The lower priority of the surrounding nodes results in the improvement of channel access for the involved vehicle and pedestrian nodes. We evaluate the proposed mechanism under different configurations of number of pedestrians, different safety message periodicity, and varying duration for lower-priority safety message transmissions. The simulation results show improvement in the packet delivery ratio under the proposed mechanism and also provides basis for the effective implementation of on-demand Quality-of Service mechanism for crucial communication.