Although the time of this year's college entrance examination has been postponed due to the epidemic, the corresponding protective measures have not been reduced at all to ensure the safety of examination information. During the examination, the relevant departments will turn on the frequency jammer at each examination site, which may affect the communication quality of mobile phone users around the school. The communication will not resume until the end of the examination. What's the role of turning on the frequency jammer during the exam?

In order to know what is the role of jamming mobile phone signals, let's first understand the working principle of mobile communication. As a mobile communication device, mobile phones need to establish a connection with nearby base stations before accessing the core network to find the communication destination. In the above process, all information is carried and transmitted through electromagnetic waves. The electromagnetic wave frequency band used by the mobile phone is related to the mobile phone model and the operator. If you want to interfere with the mobile phone signal in the examination room, it is impossible to disable the BTSs near the examination room, or all communication devices in this area will not be able to communicate normally. However, in general, the electromagnetic wave frequency band used by operators is distributed in the range of 850MHz to 5800MHz, so it is only necessary to interfere with the signal of this frequency in the examination room to achieve the goal. At this point, only a small frequency jammer can perfectly solve all mobile phone signals in the examination room.