Now, our mobile phones are connected to the base station through the uplink frequency, and then transmit the signal to the mobile commerce switching center to complete the call. In the standby state, the mobile phone is connected to the base station through the broadcast control channel. Once there is a call need, it first asks the base station for instructions, and allocates the mobile phone business channel according to the specific conditions of the near-terminal channel, so that the mobile phone jumps to the business channel for calls and data transmission.
At the same time, 4G wireless communication must ensure a sufficient signal-to-noise ratio to effectively receive and complete communication.
Based on the above principles, we can conclude that 4g wireless signal screens are generally composed of power supply, electronic scanning control unit, segmented radio frequency unit, amplification unit, transmitting antenna unit, etc. This signal generator generates a scanning signal. After passing through the inverter, the oscillator is modulated to the working frequency band of mobile communications. The power is then amplified by the power amplifier and the voltage regulator tube controls the power, and the frequency-sweeping amplified signal is transmitted to the air through radio waves.
When the mobile phone receives the message signal, due to the garbled interference caused by the frequency sweep signal (increasing the proportion of noise signals to the device threshold), the wifi signal jammer cannot receive the normal 4G data sent by the base station, and therefore cannot make a normal connection with the base station. , causing the mobile phone to be separated from the base station communication network. The mobile phone shows that there is no signal and no service system in the search network, achieving a blocking effect.