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A Flexible TDMA Overlay Protocol for Vehicles Platooning

  • Aqsa Aslam
  • Luis Almeida
  • Frederico Santos
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10796)

Abstract

Vehicular Ad-hoc Networks (VANETs) can enable a wide range of vehicle coordination applications such as platooning. A good use of the communication channel is paramount for an adequate quality of service. Currently, IEEE 802.11p is the standard used in VANETs and relies on CSMA/CA, which is prone to collisions that degrade the channel quality. This has led to recent proposals for TDMA-based overlay protocols that synchronize vehicles beacons to prevent or reduce collisions. In this paper, we propose RA-TDMAp that puts together properties of two previous works. On one hand, it allows the nodes in one platoon to remain synchronized even in the presence of interfering traffic, e.g. from other vehicles, by adapting the phase of the TDMA round to escape periodic interference. On the other hand, it reduces channel occupation by having just the leader transmitting with high power, to reach all the platoon at once, while the followers transmit with low power. The order of transmission is such that the leader gathers information from the whole platoon in just one round. We simulated RA-TDMAp in realistic conditions using the PLEXE simulation framework. We show the phase adaptation of the TDMA round and we compare RA-TDMAp to state of the art protocols tailored for platooning, with three networking metrics: channel busy ratio, collisions and safe time ratio, all of which confirm the superiority of RA-TDMAp.

Keywords

VANETs MAC protocol TDMA CSMA/CA 

Notes

Acknowledgement

This article is a result of the project Generation.Mobi, reference POCI-01-0247-FEDER-017369, supported by European Regional Development Fund (FEDER), through Operational Program Competitiveness and Internationalization (POCI).

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.IT - Instituto de TelecomunicaçõesPortoPortugal
  2. 2.CISTER - Centro de Inv. em Sistemas de Tempo-RealPortoPortugal
  3. 3.FEUP - Universidade do PortoPortoPortugal
  4. 4.ISEC - Instituto Politécnico de CoimbraCoimbraPortugal

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