1. Distributed and Adaptive Reservation MAC Protocol for Beaconing in Vehicular Networks
- Author
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Yue Li, Hamed Mosavat-Jahromi, Yuanzhi Ni, and Lin Cai
- Subjects
Vehicular ad hoc network ,Hidden node problem ,Computer Networks and Communications ,business.industry ,Wireless ad hoc network ,Computer science ,Reliability (computer networking) ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Time division multiple access ,020206 networking & telecommunications ,020302 automobile design & engineering ,02 engineering and technology ,Network congestion ,Broadcasting (networking) ,0203 mechanical engineering ,11. Sustainability ,Scalability ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,Software ,Computer network - Abstract
In vehicular ad hoc networks (VANETs), beacon broadcasting plays a critical role in improving road safety and avoiding hazardous situations. How to ensure reliability and scalability of beacon broadcasting is a difficult and open problem, due to high mobility, dynamic network topology, hidden terminal, and varying density in both the time and location domains. In this paper, wireless resources are divided into basic resource units in the time and frequency domains, and a distributed and adaptive reservation based MAC protocol (DARP) is proposed to solve the above problem. For decentralized control in VANETs, each vehicle's channel access is coordinated with its neighbors to solve the hidden terminal problem. To ensure the reliability of beacon broadcasting, different kinds of preambles are applied in DARP to support distributed reservation, detect beacon collisions, and resolve collisions. Once a vehicle reserves a resource unit successfully, it will not release it until collision occurs due to topology change. The protocol performance in terms of access collision probability and access delay are analyzed. Based on the analysis, protocol parameters, including transmission power and time slots duration, can be adjusted to reduce collision probability and enhance reliability and scalability. Using NS-3 with vehicle traces generated by simulation of urban mobility (SUMO), simulation results show that the proposed DARP protocol can achieve the design goals of reliability and scalability, and it substantially outperforms the existing standard solutions. more...
- Published
- 2021
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