Empirical Performance Models of MAC Protocols for Cooperative Platooning Applications

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Aslam, A (Autor) Outra; Santos, PM (Autor) Outra; Santos, F (Autor) Outra; Luis Almeida (Autor) FEUP

Revista

Título: Electronics (Switzerland)

Vol. 8

Página Final: 1334

ISSN: 2079-9292

Editora: MDPI

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 9 Citações

Outras Informações

ID Authenticus: P-00R-9A7

DOI: 10.3390/electronics8111334

Abstract (EN): Vehicular ad-hoc networks (VANET) enable vehicles to exchange information on traffic conditions, dynamic status and localization, to enhance road safety and transportation efficiency. A typical VANET application is platooning, which can take advantage of exchanging information on speed, heading and position to allow shorter inter-vehicle distances without compromising safety. However, the platooning performance depends drastically on the quality of the communication channel, which in turn is highly influenced by the medium access control protocol (MAC). Currently, VANETs use the IEEE 802.11p MAC, which follows a carrier sense multiple access with collision avoidance (CSMA/CA) policy that is prone to collisions and degrades significantly with network load. This has led to recent proposals for a time-division multiple access (TDMA)-based MAC that synchronize vehicles' beacons to prevent or reduce collisions. In this paper, we take CSMA/CA and two TDMA-based overlay protocols, i.e., deployed over CSMA/CA, namely PLEXE-slotted and RA-TDMAp, and carry out extensive simulations with varying platoon sizes, number of occupied lanes and transmit power to deduce empirical models that provide estimates of average number of collisions per second and average busy time ratio. In particular, we show that these estimates can be obtained from observing the number of radio-frequency (RF) neighbours, i.e., number of distinct sources of the packets received by each vehicle per time unit. These estimates can enhance the online adaptation of distributed applications, particularly platooning control, to varying conditions of the communication channel.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 19