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Bigger is Better - Combining Contention Window Adaptation with Geo-based Backoff Generation in DSRC Networks

Kloiber, Bernhard and Härri, Jérôme and Strang, Thomas and Sand, Stephan (2014) Bigger is Better - Combining Contention Window Adaptation with Geo-based Backoff Generation in DSRC Networks. In: ICCVE 2014 Conference Proceedings. International Conference on Connected Vehicles and Expo, 3.-7. Nov. 2014, Vienna, Austria.

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Abstract

The vision of safer transportation is strongly driven by the introduction of Vehicular Safety Communications (VSC) to enable new cooperative safety applications. In highly dense traffic scenarios, however, the current Dedicated Short Range Communications (DSRC) technology is expected to face serious performance problems due to simultaneous transmissions making packets to collide with each other. In this paper, we first analyze the sources of packet collisions. The analysis reveals a significant amount of simultaneous transmissions as vehicles have chosen the same backoff counter, especially in the close vicinity, which is the most critical area with respect to safety. Based on these observations, we then introduce a new concept for DSRC backoff generation called geo-backoff. It implements two countermeasures: First, we increase the Contention Window (CW) to reduce the probability of simultaneous transmissions in general. Second, we exploit geographical information for generating the current backoff counter to further reduce the probability of packet collisions at short (critical) ranges. We analyze our concept from a traditional TX-RX perspective (latency) as well as an RX-centric perspective (update delay). The simulation results indeed have shown that geo-backoff is able to improve the communication performance, but the improvement is mainly dominated by just increasing the CW.

Item URL in elib:https://elib.dlr.de/90613/
Document Type:Conference or Workshop Item (Speech)
Title:Bigger is Better - Combining Contention Window Adaptation with Geo-based Backoff Generation in DSRC Networks
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kloiber, Bernhardbernhard.kloiber (at) dlr.deUNSPECIFIED
Härri, JérômeEURECOMUNSPECIFIED
Strang, Thomasthomas.strang (at) dlr.deUNSPECIFIED
Sand, StephanStephan.Sand (at) DLR.deUNSPECIFIED
Date:2014
Journal or Publication Title:ICCVE 2014 Conference Proceedings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:DSRC, vehicular safety communication, contention window, geo-backoff
Event Title:International Conference on Connected Vehicles and Expo
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:3.-7. Nov. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugintelligenz (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Communications Systems
Deposited By: Kloiber, Bernhard
Deposited On:09 Dec 2014 09:11
Last Modified:31 Jul 2019 19:47

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