Specifically, our communication network consists of a base station. The coverage of these base stations is a circle. Considering the repeated coverage at the edge, the actual coverage of these base stations is one hexagon after another. Therefore, our mobile network is also called a "cellular mobile network" and each of these coverage areas is called a "cell". Each cell will use several channels in its coverage area, one of which is called a broadcast control channel, denoted as BCH, and the other channels are called traffic channels. In the standby state, the mobile phone intermittently starts the receiving circuit to receive the BCH of the cell where it is located. Once there is an incoming or outgoing call from a mobile phone, the first step is to request instructions from the core network through BCH. The core network handles the calling party or the called party. The core network allocates service channels to mobile phones according to the channel conditions in the coverage area, so that the mobile phone jumps from the BCH to the service channel to realize the call. In order to make the phenomenon that there is no network or the mobile phone cannot access the network in a certain area within the coverage of the mobile network signal, it is necessary to start by destroying the BCH in the cell. If the signal of the same frequency as the downlink frequency of the cell BCH is artificially transmitted in this specific area, and the signal field is stronger than BCH, the mobile phone in this area cannot receive the BCH signal, so that the mobile phone in this area cannot access the network. Cell Phone Signal Blocker Used In Schools is based on this principle.
Regarding the opening of the shielding device for the fifth-term middle school examination in Luohe City, the relevant person in charge of the Luohe Education Bureau said that as long as the national, provincial and municipal examinations are not unified, schools are generally not allowed to open Cell Phone Signal Blocker Used In Schools . No matter what the motivation of Luohe No. 5 Middle School to open cell phone jammer , it cannot affect the normal communication of other residents. The relevant person in charge of the bureau said that the matter needs to be investigated and dealt with. On the morning of November 13, Luohe Wugao Li, who was on a business trip, received a call from reporters, saying that he had been informed of the incident and ordered the school responsible comrades to turn off their mobile phones immediately. Jammers; For the exam on the 13th, the classroom monitoring system will be used in the exam room. According to the investigation, on November 13, the mobile communication signal of the residents in the neighborhood of Luohe No. 5 High School has returned to normal.
