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A novel transmit power control protocol for Vehicular Ad-hoc NETworks (VANETs) called Efficient Transmit Power Control (ETPC) is proposed in this poster. It aims to improve the reliability of safety-critical broadcasts while also maximizing the transmission range. On one hand, large transmission ranges are often desirable to ensure that safety-critical messages reach as many vehicles as possible. On the other hand, they also lead to increased channel contention and packet collisions, especially in dense networks. As a consequence, this paper proposes an adaptive transmit power control approach that balances these two conflicting goals. The approach incurs minimum additional overhead (since it is primarily based on simple overhearing) and works well in both highway and urban traffic scenarios.
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