## 3 Results
### A Comprehensive List of Identified Fault Causes of the Performance Support System Data  
In the following part, a summary of the causes of faults in the cellular network is provided. The results obtained from numerous conversations with industry experts in the mobile network optimization department of the Mobile Communications Company (Hamrahe Avval) were collected. \begin{table}
\begin{tabular}{l l} \hline \hline
**Band Category Type** & **The Accuracy on Data Test** \\ \hline Neural Network–Rapid & 80,77 \\ \hline Neural Network–RBFN & 88.46 \\ \hline Neural Network–Dynamic & 78,85 \\ \hline Neural Network–General prune & 80,77 \\ \hline Quest decision tree & 59,62 \\ \hline Support vector machine & 90,38 \\ \hline Decision tree categorizer–regression & 71,15 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Evaluation of obtained clusters for signaling data. \begin{table}
\begin{tabular}{l l} \hline \hline
**Band Category Type** & **The Accuracy on Data Test** \\ \hline Neural Network–Rapid & 86,54 \\ \hline Neural Network–RBFN & 78,85 \\ \hline Neural Network–Dynamic & 80,77 \\ \hline Quest decision tree & 59,62 \\ \hline Support vector machine & 82,69 \\ \hline Regression- band category tree & 57,69 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Evaluation of obtained clusters for traffic data. **Reason number 1:** hardware problems, including transmitter failure, antenna feeder failure, and combiner failure: the impact of these types of fault can be seen in call and indicator interruption in the signaling channel, failure rate in traffic channel assignment, and in the signal quality. **Reason number 2:** hardware problems related to the link, containing several modes. The first case is when the connection is completely disconnected, and the site is turned off. The second mode refers to the time when the link is momentarily down and, therefore, has a negative impact on the traffic channel availability index. The third case is related to a type of problem in the system that cannot be traced by the value of the indicators and can be identified according to the drive test (which is examined in detail in the next section). In this case, the channel availability indicator does not indicate a problem, but the signal quality suffers due to the high Bit fault rate (BER). In some cases, this problem may also be reported by subscribers. **Reason number 3:** Hardware problems caused by Abis interface failure. This happens when the number of signaling channels is insufficient compared to the region's demand and subscribers' demand. Therefore, the impact of this problem can be seen in the SDCCH-Assign index. **Reason number 4:** problems caused by overshooting. Overshooting is caused by improper design of sites and inappropriate coverage of a place in remote areas, and can be found by checking the value of the advanced timer. To solve this problem, it is necessary to change the physical characteristics of the antenna, such as its angle, height, and direction. **Reason number 5:** frequency interference, including interference in the BCCH channel and traffic channel. If the interference is in the BCCH channel, the traffic parameters are also affected in addition to the signaling parameters. If the interference is in the traffic channel, only the traffic parameters are damaged. **Reason number 6:** lack of capacity problems in the traffic and signaling channel. The solution is to increase the capacity and define relevant features in the settings of cellular networks to allocate dynamic capacity to the required channels according to the network traffic situation. In this section, the method used to detect the fault and identify the cause of the fault in the network is examined in detail. The difference between this work and other similar works in this field can be divided into the following. First, unlike the vast majority of similar works, our method used actual data to identify the cause of the fault in the network. Other similar works cannot model the mode of the network.