Random transmit power control for DSRC and its application to cooperative safety

Kloiber, Bernhard; Härri, Jérôme; Strang, Thomas; Rico Garcìa, Cristina
IEEE Transaction of Dependable and Secured Communication, 25 June 2015, Volume PP, N°99

Cooperative safety applications require Dedicated Short-Range Communications (DSRC) to provide position-awareness of neighboring vehicles at a specific level of reliability, i.e. awareness-quality, up toa given distance, i.e. awareness-range. However, heavy communication loads negatively impact such awareness requirements due to communication impairments, ranging from strict capacity limitations ofDSRC channels to correlated packet collisions due to periodic communication patterns. Transmissioncontrol strategies may adapt power or rate to control such impairments but risk missing the requirements of cooperative safety applications. In this paper, we design a new awareness controlstrategy by implementing a spatial awareness framework. Specifically, we adapt the distribution of the awareness-quality as a function of the awareness-range. Therefore, we first propose Random TransmitPower Control (RTPC), which manages to provide different levels of awareness-quality at different ranges, while mitigating correlated packet collisions by randomizing them in space. As RTPC is able toreduce the channel load, we secondly propose to combine RTPC with Transmit Rate Control (TRC) and to benefit from the gained channel resources by subsequently increasing the update-rate and by implication, the quality of position-awareness. The spatial awareness control capability of RTPC+TRC has been evaluated through simulations. We discuss the influence of RTPC+TRC on cooperativesafety applications exemplarily for the Forward Collision Warning (FCW) application.

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