Direct vehicle-to-vehicle (V2V) communication must operate reliably and with low latency under all circumstances to allow for imminent collision prevention. However, the amount of data to be exchanged is limited by the physical limitations of the communication channel. In vehicular ad hoc networks (VANETs), this limitation is particularly relevant when vehicle density rises and thus lots of information needs to be exchanged, bringing the communication system into a congested state. Rapidly changing topology, channel characteristics, distributed medium access, and challenging active safety application requirements cause many challenges to the resource management. This chapter reviews these issues to motivate suitable Decentralized Congestion Control (DCC) algorithms and cross-layer coordination mechanisms. In particular, it is shown that performance degradations like packet losses, the reduction of the effective communication range, and packet transmission delays are correlated with the channel load. The strategy of the DCC is to avoid these degradations by limiting the load offered by each vehicle to the radio channel, such that a certain channel load threshold is not significantly exceeded. This mitigates the communication range degradation and keeps the packet latencies moderate. The DCC is already part of specifications in the European Telecommunications Standards Institute (ETSI), e.g. ETSI TS 102 687.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Decentralized Congestion Control Techniques for VANETs



    Published in:

    Vehicular ad hoc Networks ; Chapter : 6 ; 165-191


    Publication date :

    2015-01-01


    Size :

    27 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




    Understanding the channel busy ratio metrics for decentralized congestion control in VANETs

    Autolitano, Alessia / Reineri, Massimo / Scopigno, Riccardo M. et al. | IEEE | 2014


    Microscopic Congestion Detection Protocol in VANETs

    Mushtaq Ahmad / Qingchun Chen / Zahid Khan | DOAJ | 2018

    Free access

    Decentralized Trust Management System for VANETs

    Wang, Yu / Song, Jianyong / Zhang, Yu’ang et al. | Springer Verlag | 2022



    TCP-like congestion control for broadcast channel access in VANETs

    Ruehrup, Stefan / Fuxjaeger, Paul / Smely, Dieter | IEEE | 2014