The sender controls the number of retransmissions opportunistically by tracking the current status of message reception at its neighbors.
Because the judgment of the wireless condition by the reception status of ACK messages does not reflect congestion, adaptive data rate control can lead to inefficiency in data transmission.
In the LoRaWAN, the wireless condition is considered by the reception status of the acknowledgement (ACK) message, and adaptive data rate control is performed according to the wireless condition.
In this method, a node in the idle state predicts the next message reception, and speculatively executes the message reception and user processes.
Each receiver records the time stamp at reference message reception.
Fig. 1 Schooling rate by rural/urban region and remittance reception status.
The simplified model can be used to lower bound message reception probability.
We present a new approximative channel model to determine a vehicle's message reception probability.
In general, line-of-sight is one key for a high message reception probability.
Characteristics of message reception in VANETs have been gathered in several publications, e.g., [20 23].
