## 2 Dataset Description  
The statistical model used in this paper is trained using the measurement data of one of the sea trials collected in the ASUNA dataset: the Haifa harbor (Israel) test performed in May 2009 [21]. During this experiment, 4 m rubber boats deployed the nodes in six distinct topologies (Figure 1) for different periods of time. A spatial reuse TDMA protocol (each device had a 5 s slot dedicated for transmission) was tested, and the transmission rate of the modoms was 600 bps without channel coding, using a B-PSK signal modulated by direct sequence spread spectrum (DSSS), which was created using a gold sequence-based pseudo random sequence of 128 chips, centered at 25 kHz, and bandwidth 5 kHz. The modem prototype was composed of ITC transceivers, a National Instrument data acquisition system, and a laptop for signal processing. The transceivers were deployed at a depth of 4 m.  
The LQI observed during the trial is the Bit Error Rate (BER), defined as the ratio between the number of erroneous bits and the total number of transmitted bits. The dataset provides a set of time-varying BER per-link values collected into six Topology Matrix Information (TMI) (one for topology). A TMI consists of an NxN matrix, with \(N\) being the number of nodes in a topology, where the entry \((t,i,j)\) represents the BER value for the link from node \(i\) (transmitter) to node \(j\) (receiver) at time \(t\): the time interval between two subsequent measurements is 5 s, at each measurement BER and GPS position (in UTM coordinates) of each node are recorded. During the sea trial, Topology 1 was tested for 30 min, Topology 2, 3, 4, and 5 were tested for 60 min, while topology 6 was tested for 90 min. Table 1 provides the experiment details.  
Figure 1: Topologies tested in the sea trial [6]: topology 1 (a), topology 2 (b), topology 3 (c), topology 4 (d), topology 5 (e), and topology 6 (f).  
During the experiment, the LQI of each link was varied in time. In some of the links the BER was very small for almost all the time, while other links had a higher error rate.  
For instance, in Figure 2 we can observe the BER Cumulative distribution function (CDF), fitted with an exponential distribution, of three representative links observed during the trial.  
Specifically, Figure 1(a) presents the CDF of the very stable link from node 4 to node 2 observed in topology 2, whose BER is lower than 0.02 for 90% of the time. Figure 1(b), instead, presents the CDF of the link from node 3 to node 2 observed in topology 2: in this case the BER is slightly higher than in the previous case but never exceeds 0.06. Finally, Figure 1(c) depicts the link from node 1 to node 3 observed in topology 3: this link has a BER that is definitely higher than the other two links.  
\begin{table}
\begin{tabular}{c c c c} \hline
**Location, Date** & **Nodes** & **Topologies** & **Collection Time** \\ \hline Haifa Harbor, 05/09 & 4 & 6 & 30–90 min \\ \hline
**Rate** & **LQI** & **Total Time** & **Interference** \\ \hline Once every 5 s & BER & 6 h & No \\ \hline \end{tabular}
\end{table}
Table 1: Haifa Harbor sea trial details.  
Figure 2: Examples of BER CDF fits for the stable link from node 4 to node 2 observed in topology 2 (**a**), the average link from node 3 to node 2 observed in topology 2 (**b**), and the challenging link from node 1 to node 3 observed in topology 1 (**c**).