With the rapid development of mobile communication technology, mobile phones are increasingly becoming an indispensable tool in people's work and life. Modern communication means for us to create convenient, fast, accurate comprehensive services, but also brought increasingly serious information security risks. It is an urgent and necessary task to implement intelligent management and control of mobile phone communication in specific areas and special environments.
The USRP system can implement intelligent monitoring and control of all mobile phone communications of the three major operators in a specific region and under a specific environment, so as to effectively solve the information security problems brought by mobile communication technology.
The main problems of traditional mobile phone control
At present, there are many kinds of mobile phone blockers and mobile phone communication jammers sold and used in the market, and their working principle is basically the method of white noise multi-band scanning and wide spectrum co-frequency coverage, and the transmitted interference signal power is far greater than the communication signal power transmitted by the base station, so as to block the communication channel between the base station and the mobile terminal.
The main problem:
(1) The high-power interference signal emitted by the equipment produces powerful electromagnetic radiation, which produces serious radiation to the human body, and if the transmission power is small, it can not be effectively shielded.
(2) The equipment has no intelligent discrimination ability, and the communication of all mobile phones in the area is blocked (blind shielding).
(3) Only the signal shielding function can not judge whether there is a mobile phone in the shielding range, and how many mobile phones, which operator's mobile phone and other information. It does not have various control functions such as mobile phone detection code identification and database statistical analysis, and cannot meet the special requirements of professional customers for mobile phone control.
Key technologies of mobile phone monitoring and intelligent control system
(1) Software radio and digital DSP technology:
Using software radio base station technology, FPGA,DSP digital technology and computer control technology, the system only needs to reach the signal field strength equivalent to the traditional base station to effectively detect and control the mobile phone in the coverage area, and the electromagnetic radiation of the personnel in the coverage area fully meets the radiation standards stipulated by the state, and will not cause long-term radiation damage to the human body, which is called green shielding.
The system design idea:
1: Equipment 1: For 2G mobile phones of China Unicom and China Telecom, GSM and CDMA base station code detection technology is adopted to collect IMSI,IMEI and MSISDN codes of mobile phone users, and keep mobile phone users on the base station all the time, so as to carry out effective control.
2: Equipment 2: For mobile, Unicom, telecom 3G,4G mobile phone users, the use of digital base station technology, through the instruction redirection technology, forcing 3G,4G mobile phone users to stay on the 2G base station, so as to effectively control.
(2) Shielding function:
The device automatically sweeps the frequency and sets the frequency point. The power is manually adjusted to shield all 2G, 3G and 4G mobile phones in the effective area.
(3) Blacklist function:
The device can set GSM/CDMA 2G blacklist and whitelist, or 3G/4G blacklist and whitelist. All blacklist users can block communication with the surrounding public network base station, and only establish communication with the system to play a shielding role. Whitelisted users can maintain 2G calls and 3G/4G Internet access.
Whitelisted users can be set separately under 2G,3G, and 4G standards, and can be freely selected when using. Some whitelisted users can only talk, some can only surf the Internet, or they can all talk and surf the Internet.
(4) Code detection function:
In the effective control area, the system automatically detects the IMSI, IMEI and ESN of the mobile phone user (CDMA user) and the mobile phone number MSISDN, and can intercept the short message content sent by the blacklist user in the shielded area and the related user number, and can also intercept the called number when the mobile phone calls.
(5) Warning SMS:
When searching for a mobile phone in the controlled area, the device automatically sends an alarm message to the phone, such as: "You have entered the controlled area, please power down immediately." Ask the owner to turn off the phone. The number of sending times can be set, and the sending interval can be set.
(6) The translated user number can be sent directly to the large screen through the projection to play a deterrent role.
System setting interface
The latest version of the company takes effect
This parameter table configures the device information
CDMA parameter configuration table
GSM parameter configuration
Whitelist parameter list, can be added, deleted or modified
Mobile phone reporting information
Mobile phone information is reported. Red indicates the content and called number of short messages sent by the mobile phone during the control period
Equipment hardware technical parameters
See product page
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