Study of Broadcast Protocols for Emergency Message in Vehicular Ad-Hoc Networks (VANET)

Abstract

In the development of 5G there are three main application scenarios namely eMBB uRLLC and mMTC and each scenario has different difficulties to overcome Among them the uRLLC (ultra-Reliable and Low Latency Communications) scenario emphasizes ultra-high reliability and low latency applications where V2X is one of the main applications in this scenario “Emergency message Alert” is one of important application in V2X This application is to notify the subsequently vehicles the alert message primarily in broadcast and multi-hop manner However the “Broadcast storm” problem is an important issue that need to be overcome in broadcast process If there is no proper mechanism to determine whether to forward the message it will cause unnecessary transmission and serious collision Thus how to design a broadcast protocol to ensure low latency and high reliability and make the messages be delivered far is the main research topic In this thesis we simulated and compared the reliability latency and communication range between several broadcast suppression protocols (p-persistence weighted p-persistence slot1/p-persistence and BPAP) And we think the way to select the forwarding node is an important design issue Therefore this thesis proposes an integrated broadcast suppression technology including the mechanism of backoff and through side-acknowledge method to ensure that the message can be transmitted smoothly without compromising the reliability of the system The simulation results show that the reliability can be greatly improved without a significant increase in latency compared with other known methods

Date of Award	2020
Original language	English
Supervisor	Szu-Lin Su (Supervisor)