1. Jammer filter, set this frequency band of the mobile phone signal as the stop band of the filter;
2. According to frequency band division: uplink interference, downlink interference;
Uplink Interference:
It is defined as the interference caused by external radio frequency interference sources to the base station when the interference signal is in the uplink frequency band of the mobile network. Uplink interference will reduce the coverage of the base station. When the mobile phone has no uplink interference, the base station can receive the signal of the mobile phone far away; when the uplink interference occurs, the mobile phone signal must be stronger than the interference signal to communicate with the base station. Therefore, the mobile phone must be closer to the base station.
Downlink interference:
Downlink interference means that the interference signal sent by the interference source is in the downlink frequency band of the mobile network. When the mobile phone receives the interference signal, it cannot distinguish the normal base station signal, so that the communication between the mobile phone and the base station is interrupted, resulting in call drop or failure to allocate channels.
3. Divide according to frequency points: same-frequency interference and non-same-frequency interference.