Method and system for shielding GSM mobile phone signal

Abstract

The invention discloses a method and a system for shielding a GSM mobile phone signal, which interferes with mobile phone uplink frequency to achieve shielding. The characteristic that an uplink signal transmitted by the mobile phone has at least one uplink time slot period is used, and it is detected and identified whether the uplink signal intensity reaches a set level threshold in the uplink time slot period, and it is determined whether the transmitting mobile phone is located in a shielding area accordingly; for the mobile phone determined to be located in the shielding area, shielding interference signals of the same time slot are transmitted, so that the intensity of the interference signals is greater than the intensity of the uplink signal transmitted by the mobile phone to interfere with the reception of the base station, thereby interrupting the communication of the mobile phone. A system for shielding a GSM mobile phone signal comprises an uplink receiving antenna, a filter, a power detection comparator, an interference transmitter, and an uplink interference antenna. By adopting the method and system provided by the invention, while shielding the GSM mobile phone signal, other users in the area are not affected; and signals are not transmitted when the mobile phone is not used, thereby reducing waste and reducing wireless signal pollution.

Description

technical field [0001] The invention relates to the shielding field of mobile communication, and mainly relates to a shielding method and system for GSM mobile phone signals. Background technique [0002] For the shielding of GSM mobile phones, most of them use the interference downlink frequency to achieve shielding. The combined fixed-frequency jammer formed by the combination of jammers, when targeting strong base station signals, usually selects several frequency points to strengthen interference at the strongest nearby base stations, that is, N-point frequency interference. Take the same frequency band signal as an example, if there are two operators’ base stations, for example, one operator’s base station is close and the signal is strong, and the other operator’s base station is far away and the signal is weak, then the shielding strength should be based on the strongest signal For base stations with weak signals, because the shielding is set according to the stronge...

AI Technical Summary

Problems solved by technology

But this technology has the following problems: In view of the characteristics of GSM, BCCH carrier is transmitted continuously, while TCH carrier is transmitted on demand, so the shielding of BCCH carrier in this patented technology is complete, but because the receiving time slot of TCH carrier has random There is no guarantee that the TCH carrier can get the user's transmission time slot. That is, the shielding is normal when the TCH carrier is received and the transmission is received. When the TCH carrier is not transmitted, the shielding is not transmitted. The shielding of the carrier is invalid, so the shielding of the TCH carrier is missing

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