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We propose an uncoordinated all-to-all broadcast protocol for periodicmessages in vehicular networks based on coded slotted ALOHA (CSA). Unlikeclassical CSA, each user acts as both transmitter and receiver in a half-duplexmode. As in CSA, each user transmits its packet several times. The half-duplexmode gives rise to an interesting design trade-off: the more the user repeatsits packet, the higher the probability that this packet is decoded by otherusers, but the lower the probability for this user to decode packets fromothers. We compare the proposed protocol with carrier sense multiple accesswith collision avoidance, currently adopted as a multiple access protocol forvehicular networks. The results show that the proposed protocol greatlyincreases the number of users in the network that reliably communicate witheach other. We also provide analytical tools to predict the performance of theproposed protocol.

All-to-all Broadcast for Vehicular Networks Based on Coded Slotted ALOHA