The relevant person in charge of Chongqing Mobile told upstream news reporters that since the college entrance examination test sites in the main urban area of Chongqing are all within the urban area, the installation of a large number of full-spectrum mobile cell phone jammer will have a certain impact on the network use of surrounding users. During the annual college entrance examination, it is the most critical to not only ensure the information security of the examination room, but also to ensure the perception of surrounding users.
According to the person in charge, the jammer will scan from the low-end frequency of the channel to the high-end frequency at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc. The essence of the mobile phone signal jammer is to implement electromagnetic interference on the wireless network, so that the mobile phone cannot access the network, cannot receive the signal from the mobile network, and cannot send out information through the network. Therefore, during the college entrance examination, the call quality of mobile phone users around the test center will also be affected, or there will be no signal, frequent call failures, inability to connect, intermittent calls, and slow mobile Internet access.
“In response, we have taken a number of measures, including increasing the investigation of surrounding fake base stations, and preventing criminals from using the psychology of the parents of candidates during the college entrance examination to send illegal and false information such as cheating and training. At the same time, during the college entrance examination mobile phone jammer deployment stage , and the examination room department to check and test the coverage of the mobile phone signal jammer to ensure the effective and reliable interference. In addition, the antenna adjustment, power optimization and new functions of alleviating the interference of the mobile phone signal jammer are also opened in the surrounding area of the examination room. The interference range of the device should be controlled within the examination room as much as possible, so as to reduce the extension of its interference to the surrounding areas, and improve the network perception in the non-exam area.” The person in charge introduced that a total of 5 illegal mobile pseudo base stations have been identified; nearly 10 illegal text messages have been reduced. There are more than 10,000 antennas, 156 antennas have been adjusted, 440 power parameters have been adjusted, and 335 cells have been activated with new functions.