Transmission method in a heterogeneous V2I system, server and corresponding system The invention relates to a data transmission method, the data coming from messages intended respectively for terminals, via at least a first millimeter band access network comprising relays. distributed in space according to a determined density λ or via a second access network with a frequency band below 6 GHz comprising so-called macro base stations, such that a choice of the access network is made before each transmission on the based on a comparison between estimated bit rates with each of the access networks, the message intended for the terminal comprising B segments coded in the form of binary signals. According to the invention, the method comprises: estimating a state of a transmission channel between the relays and the terminal at a current transmission interval, transmission in a data packet selected from the current binary signals and the binary signals already transmitted knowing the estimated overall state of the transmission channel. Figure for the abstract: Figure 5
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