RV-MAC: A Reliable MAC Protocol for Multi-Hop VANETs

Guodong WU  Chao DONG  Aijing LI  Lei ZHANG  Qihui WU  Kun ZHOU  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.8   pp.1626-1635
Publication Date: 2019/08/01
Publicized: 2019/01/25
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3258
Type of Manuscript: PAPER
Category: Network
VANETs,  TDMA,  MAC,  multi-hop,  reliable,  

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With no need for Road Side Unit (RSU), multi-hop Vehicular Ad Hoc NETworks (VANETs) have drawn more and more attention recently. Considering the safety of vehicles, a Media Access Control (MAC) protocol for reliable transmission is critical for multi-hop VANETs. Most current works need RSU to handle the collisions brought by hidden-terminal problem and the mobility of vehicles. In this paper, we proposed RV-MAC, which is a reliable MAC protocol for multi-hop VANETs based on Time Division Multiple Access (TDMA). First, to address the hidden-terminal under the networks with multi-hop topology, we design a region marking scheme to divide vehicles into different regions. Then a collisions avoidance scheme is proposed to handle the collisions owing to channel competition and the mobility of vehicles. Simulation results show that compared with other protocol, RV-MAC can decrease contention collisions by 30% and encounter collisions by 50% respectively. As a result, RV-MAC achieves higher throughput and lower network delay.