# Vehicle-to-Vehicle Communication: Fair Transmit Power Control for Safety-Critical Information

Torrent-Moreno, Marc; Mittag, Jens; Santi, Paolo; Hartenstein, Hannes

##### Abstract:
Direct radio-based vehicle-to-vehicle communication can help to prevent accidents by providing accurate and up-to-date local status and hazard information to the driver. In this paper, we assume that two types of messages are used for traffic safety-related communication: periodic messages (beacons') sent by all vehicles to inform their neighbors about their current status (i.e., position), and event-driven messages sent whenever a hazard has been detected. In IEEE 802.11 DCF-based vehicular networks, interferences and packet collisions can lead to failure of reception of safety-critical information, particularly when the beaconing load leads to an almost saturated channel as it could easily happen in many critical vehicular traffic conditions.

In this paper we demonstrate the importance of transmit power control for avoiding saturated channel conditions and ensuring best use of the channel for safety-related purposes. We propose a distributed transmit power control method based on a strict fairness criterion, D-FPAV, to control the load of periodic messages on the channel. The benefits are twofold: i) bandwidth is made available for higher priority data like dissemination of warnings; ii) beacons from different vehicles are treated with equal rights' and best possible reception under the available bandwidth constraints is ensured. ... mehr

 Zugehörige Institution(en) am KIT Institut für Telematik (TM) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2009 Sprache Englisch Identifikator ISSN: 0018-9545, 1939-9359 KITopen-ID: 1000014827 Erschienen in IEEE transactions on vehicular technology Band 58 Heft 7 Seiten 3684-3707 Nachgewiesen in Web of ScienceScopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page