# Data Traffic Modeling in RPAS/UAV Networks with Different Architectures
## 4 Models
Mentioned effects can lead to a decrease in the data transmission rate and an increase in the number of bit errors in messages. For a quantitative assessment of the consequences of this, we simulated data transmission with different rates (Figure 4) and the number of bit errors (Figure 5) for all models. For RPAS data transmission, it is necessary to organize Command, Control, and Communication (C3) data traffic (Figure 1) in accordance with the ICAO circular [23]. The C3 data traffic consists of a Tactical Data channel (Command and Control) for RPAS flight control and a Common Data channel for transmitting payload data. Command and Control communication without payload data refers to time-critical control and safety commands for maintaining flights and includes navigation, waypoint updates, telemetry reports, and Air Traffic Control communications. The reliability requirement for this is less than \(10^{-6}\) bit error rate. Payload transmission refers to all information of the RPAS/UAV mission and \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Parameters**\(\rightarrow\) & \multirow{2}{*}{**Bandwidth (Mbps)**} & \multirow{2}{*}{**Length (m)**} & \multirow{2}{*}{**BER (\%)**} \\ \cline{1-1}
**Model Elements**\(\downarrow\) & & & & \\ \hline \multicolumn{4}{c}{**Model 1: “BS-RPAS1-CU3”**} \\ \hline Base Station & & & & \\ Tactical Data (TD) Workgroup & 10 & - & - \\ Common Data (CD) Server & 10 & - & - \\ TD—Switch link & 10 & 1 & 0 \\ CD—Switch link & 100 & - & - \\ Switch—Antenna link & 44.736 & 10 & 0 \\ Antenna & 1000 & - & - \\ BS—RPAS 1 wireless link & 2.048–44.736 & \(10^{5}\) & 0–0.05 \\ RPAS 1 & 1000 & - & - \\ RPAS 1—CUs 1 wireless links & 44.736 & \(10^{5}\) & 0 \\ CUs 1 & & & \\ Antenna & 1000 & - & - \\ Antenna—Switch link & 44.736 & 10 & 0 \\ Switch & 1000 & - & - \\ Switch—Server link & 10 & 1 & 0 \\ Server & 10 & - & - \\ \hline \multicolumn{4}{c}{**Model 2: “BS-RPAS1-RPAS2-CU3” (in addition to Model 1)**} \\ \hline RPAS 1—RPAS 2 wireless link & 44.736 & \(10^{5}\) & 0 \\ Antenna & 1000 & - & - \\ RPAS 2 & 1000 & - & - \\ \hline \multicolumn{4}{c}{**Model 3: “BS-RPAS1-CU3-RPAS2-CU3” (in addition to Model 2)**} \\ \hline RPAS1—CUs 1 wireless links & 44.736 & \(10^{5}\) & 0 \\ CUs 1 & & & \\ \hline \multicolumn{4}{c}{**Model 4: “BS-RPAS1-CU3-RPAS2-CU3-RPAS3-CU3” (in addition to Model 3)**} \\ \hline RPAS 1—RPAS 3 wireless link & 44.736 & \(10^{5}\) & 0 \\ RPAS 3—CUs 3 wireless links & 44.736 & \(10^{5}\) & 0 \\ CUs 3 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Parameters of Models. can include the transmission of data from users of the cellular network, remote multisensor data (radar data, optical, infrared systems, etc. ), and transmit real-time video at a high data rate in the surveillance operation. Traffic with File Transfer Protocol (FTP) profile for Tactical Data (TS = 100 Kbits and TBT = 1 s with Const distribution laws) and Local Area Network (inter LAN) profile for Common Data (TS and TBT with Const distribution laws, TBT = 1 s) has been defined for the designed models with topology according to Figure 2. Command, Control, and Communication traffic is carried out as two-way communication. RPAS/UAV communication requirements were selected in accordance with the cellular communications [8] and ICAO requirements [36].