On June 8, 2021, the Huangpi District Education Bureau of Wuhan reported a case of cheating by candidate Wu. The candidate illegally brought his mobile phone into the examination room to check the test paper, and the invigilator was investigated for negligence in the entrance security check. The Huangpi District Admissions Office responded that the candidate may have taken advantage of the 5G signal shielding loophole and uploaded the test questions with his mobile phone. As we all know, the use of mobile phones is prohibited in the examination room, and mobile phone signal blockers are generally installed to make mobile phones unusable.
Is the blocker outdated or unable to block 5G signals?
“5G is a relatively new network system that uses a new radio frequency band. Many old models of jammers do not support the shielding of 5G signals.
In terms of 5G frequency bands, China Telecom and China Unicom mainly use 100MHz spectrum resources in the 3.5GHz band for 5G, while China Mobile mainly uses 160MHz in the 2.6GHz band and 100MHz in the 4.9GHz band.
The working principle of the signal jammer is to emit a stronger signal in the corresponding mobile network frequency band to suppress the normal signal, thereby achieving the purpose of shielding.”
“The first possibility is that the 5G signal may be outside the effective range of the signal jammer used at the test site. The second possibility is that the 5G signal itself has a strong anti-interference ability, and it is difficult for the signal jammer to successfully suppress the interference.”
With the continuous development of communication technology, the 5G signal format is different from the original 4G format, and it is also possible that the old model of jammers cannot completely interfere with the 5G signal.
To make up for this loophole, it is necessary to consult the telecommunications department in advance to understand what types of signals exist near the examination room, and then deploy jammers in a targeted manner.
The power of the jammer will also affect the effect of signal shielding. In addition, the shielding effect of the jammer depends on the strength of the signal on site. If the signal strength is too strong, it may not be effectively suppressed, and it is necessary to consider using a Cell Phone Jammer with higher power.
According to the official Weibo announcement of the Huangpi District Education Bureau of Wuhan City, after reviewing the video playback of the examination room on the evening of June 7, it was confirmed that the candidate Wu Moumou illegally brought his mobile phone into the examination room to secretly take pictures of the test paper. After investigation, the invigilator had problems with the entrance security inspection and dereliction of duty. The candidates who violated the regulations will be disqualified from the examination, and their registration stage and subject scores will be invalid. Further measures are currently being taken based on the results of the investigation.
On the afternoon of the 8th, the radio management department of Hubei Province responded to the media that a special team has been set up to investigate the matter. If it is determined that the candidates used radio equipment to cheat, the relevant responsibilities will be investigated according to law.
