Value Analysis of Transmission Distance in Urban Vehicular Networks

IEEE 802.11p is a wireless communication protocol targeting at special requirements of vehicular communications. However, current study on IEEE 802.11p has not verified if the defined transmission distance is appropriate. Based on a discrete road model, we propose the concept of validity and necessity of the transmission distance, and then derive formula to calculate the probability to meet the requirements of validity and necessity with an approximate Poisson vehicle distribution. The formula is simulated based on real-world parameters of urban vehicular networks. The simulation result shows that validity and necessity of the transmission distance are relevant to the vehicle density. The transmission distance defined by IEEE 802.11p is unnecessarily large in order to meet the requirements of validity and necessity. Keywords-IEEE 802.11p, transmission distance, urban vehicular network