Open AccessA Modified RR-ALOHA Protocol for Safety Message Broadcast in VANETs
Author(s) -
Zhong Huang,
Rui Xu,
Chu Chu,
Guangjun Wen
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1650/3/032005
Subject(s) - aloha , computer science , computer network , network packet , frame (networking) , broadcasting (networking) , protocol (science) , reservation , capture effect , collision , throughput , wireless , computer security , telecommunications , medicine , alternative medicine , pathology
MAC protocol design of VANETs is a real challenging task due to the high mobility and mobile hidden terminals (MHTs) issues. Slotted ALOHA based MAC protocols is regarded as one of the most promising solution in which hidden terminals issues are solved by broadcasting frame information (FI). However, when network topology changes rapidly, the vehicles using the same slot comes close to each other, merging collisions take place and a new round of slot reservation is required. This paper proposes a modified Reliable Reserved ALOHA (RR-ALOHA) protocol in which merging collisions are detected and an election process is employed to reduce collisions directly after one merging collision. Simulation results show that our proposal achieves better packet delivery ratio than RR-ALOHA in most scenarios.