## 2 Materials and Methods
### Analysis
\begin{table}
\begin{tabular}{p{142.3 pt} p{142.3 pt}} \hline \hline
**Metrics** & **Description** \\ \hline Packet Delivery Ratio (PDR) [40] & The ratio of packets successfully received to the total sent. Low PDR leads to the jamming detection, but to confirm a low PDR is due to jamming, consistency checks are used. \\ \hline Signal-to-Noise Ratio (SNR) [40] & It measures the relative amplitude of the signal to noise. The presence of interference limits the reliability with which the receiver can correctly interpret the transmitted information. \\ \hline Throughput [41] & It is the average success rate in delivering a message (packet) without considering packet headers, ACKs, retransmissions, etc. \\ \hline Overhead [42] & This metric gives an idea of the load cost of network with respect to control packets, depending on routing protocol. This parameter will influence the number of collisions and therefore directly relate to packet retransmissions. \\ \hline Hops [43] & This metric provides information about the network size. If the network is small and the hop number to reach a destination is increasing, this means that there are nodes or paths that are missing. When the number of hops to a destination is constantly changing, it is a sign of instability in the routing tables of nodes. This parameter is related to link quality, packet retransmissions, and validity of routes. \\ \hline Delay [41] & This metric gives an idea of the length of the routes needed by a packet to reach its destination. It is directly related to the hop number. This parameter is influenced by the processing, propagation, and transmission times of packets. Directly influences the recovery time of the network and is also a measurement parameter for features such as self-configuring. \\ \hline Availability of routes [43] & This metric acts according to the type of routing protocol. There are reactive, proactive, and proactive-reactive protocols. According to these characteristics, availability of routes helps to keep the information and the processing time is smaller in routing tables. It is related to valid routes and overhead of each protocol. \\ \hline Valid routes [43] & The amount of valid routes relates to packet loss, delay, and retransmissions. The larger valid routes in routing tables, the lower will be the probability of broken routes and lower packet loss on paths. For this metric, protocols use control packets (error packets, timeouts, or continuous update of routes). \\ \hline Retransmissions [44] & This metric is related to the number of lost packets and overhead. When the control packets of a routing protocol are too much and are continuously present in the network, there may be a more significant probability of collisions and retransmissions. This metric provides insight into possible problem areas or potential network attacks. \\ \hline CSMA retries [40] & This metric is related to the channel occupancy. When there are many packet retransmissions, collisions and overhead, the channel is occupied continuously and the CSMA/CA algorithm has to recalculate an increasing delay until, in some cases, the packet is discarded. This variable also gives an idea of potential problems in specific areas of the network. \\ \hline Recovery time [44] & This metric is directly related to delay and reliability. Here, control packets play a significant role in the routing protocol. It is related with resilience. It gives an idea of the self-configuring characteristic of each protocol. It is related to the number of hops and overhead. \\ \hline Reachable nodes from the coordinator [44] & This metric is directly related to the retries metric. With this measure, we can get an idea of the reliability of links to all network nodes. We can also observe possible problems, attacks, or network failures. They can also detect traffic bottlenecks and possible routes that no longer work. \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Metrics impact on jamming detection.