CN100486145C - Method and device for realizing air monitoring - Google Patents
Method and device for realizing air monitoring Download PDFInfo
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- CN100486145C CN100486145C CNB031536158A CN03153615A CN100486145C CN 100486145 C CN100486145 C CN 100486145C CN B031536158 A CNB031536158 A CN B031536158A CN 03153615 A CN03153615 A CN 03153615A CN 100486145 C CN100486145 C CN 100486145C
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Abstract
The method includes steps: (1) setting up frequency of audio monitor identical to frequency in current sub zone, searching common channel of the sub zone; (2) based on configuration of common channel, building channels corresponding to receiving channel of mobile terminal monitored and receiving channel of base station to monitor up and down going channels in current sub zone, building service channel in forward direction and reverse direction of mobile terminal monitored, through service channel in forward direction, receiving signal sent from base station to mobile terminal monitored; (3) through service channel in reverse direction, receiving signal sent from mobile terminal monitored to base station; demodulating signal received in step (3), and the demodulated signal is output. The audio monitor includes antenna feedback system, radio frequency reception channel, base band processing unit, CPU, service processing unit and peripheral equipment.
Description
Technical field
The present invention relates to moving communicating field, specifically, relate to and being applied in the code division multiple access system, realize aerial method and the audiomonitor of monitoring.
Background technology
The development of mobile communication allows increasing people use portable terminal (MS) to carry out the information transmission, and the most basic business has voice call and short message.The convenience of mobile service is also utilized by some unlawful activities, and for safeguarding national security and people life property safety's needs, the specific user to particular range in the tolerance band of law monitors, the effect of playing monitoring and preventing.
Proposed at present to monitor private network by setting up, use audiomonitor by monitoring the private network and the technology of link that connected by monitoring mobile subscriber (MS) to realize monitoring, this private network monitoring system complexity is huge, need do bigger change to network equipments such as the mobile switching centre in the communication network (MSC), Home Location Register, and need increase the air interface of audiomonitor and network, audiomonitor needs to be connected with the network equipment wiredly, uses underaction.
Summary of the invention
The object of the present invention is to provide a kind of aerial method of monitoring that realizes, under the situation of not changing conventional network equipment, in CDMA network, terminal is monitored in the air wirelessly.
A kind of method of aerial monitoring that realizes provided by the invention is achieved through the following technical solutions:
A) it is identical with the working frequency points of audiomonitor current area the frequency of audiomonitor to be set, the common signal channel of search sub-district, audiomonitor place;
B) according to configuration of common channel, set up corresponding to the receive channel of being monitored portable terminal with corresponding to the receive channel of base station, the up-downgoing channel in the monitoring current area scope,
C) according to the field contents that comprises in the signaling that monitors, set up forward traffic channel and the reverse traffic channel of being monitored portable terminal, receive the base station by forward traffic channel and issue the signal that this is monitored portable terminal; Receive quilt monitoring portable terminal by reverse traffic channel and issue signal of base station;
D) base station signal of demodulation step C reception and quilt are monitored the signal of portable terminal, are exported after the signal processing with base station signal after the demodulation and quilt monitoring portable terminal.
Another object of the present invention is to provide a kind of audiomonitor, realize wirelessly the terminal monitoring under the CDMA network overlay area.
Audiomonitor provided by the invention is as described below:
A kind of audiomonitor of realizing aerial monitoring is characterized in that this equipment comprises power module, antenna-feedback system, radio frequency reception channel, baseband processing unit, central controller, Service Processing Unit, ancillary equipment; Wherein, central controller links to each other with baseband processing unit and Service Processing Unit; Power module provides working power for antenna-feedback system, radio frequency reception channel, baseband processing unit, central controller, Service Processing Unit and ancillary equipment;
Described antenna-feedback system receives from signal of base station simultaneously and is exported behind the signal of monitoring portable terminal;
Radio frequency reception channel receives the output of antenna-feedback system and handles, and output base station baseband signal and quilt are monitored the mobile terminal baseband signal to baseband processing unit;
Baseband processing unit receives the control command of central controller output, and demodulation base station baseband signal and quilt are monitored the mobile terminal baseband signal, and export Service Processing Unit to;
Service Processing Unit receives the Business Processing order of central controller output, exports ancillary equipment with the base station baseband signal after the demodulation with after monitoring the mobile terminal baseband signal processing to by interface.
The present invention has following characteristics with respect to existing monitoring system:
1, utilizes the broadcast transmission features of Radio Link, by the wireless mode of intercepting, do not needing to set up under the situation of special-purpose wire link and can monitor the terminal of a given area, and business to be monitored can be versatile and flexible, be not subjected to the influence of other equipment or interface, needn't change yet prior network device;
2, realize simultaneously a plurality of users of a plurality of CDMA Cellular System are monitored, only limited hardware configuration and the disposal ability with equipment itself of monitoring quantity do not resemble the influence that may be subjected to equipment interface, link bandwidth etc. the wired monitoring;
3, utilize eat dishes without rice or wine transmission information and up and down other means such as the monitoring of link or directional antenna can realize location to designated user;
4, external distinct device can be realized different functions such as storage (post analysis), speech recognition, deciphering.
Description of drawings
Fig. 1 is the logic diagram of audiomonitor;
Fig. 2 is the schematic diagram that audiomonitor constitutes.
Embodiment
Owing in radio communication, aloft all launch in the electromagnetic wave mode from the signal of signal of base station and terminal, the present invention sets up receive channel by the above-mentioned aerial signal of intercepting, monitors with voice or data service that the terminal communication both sides are carried out.
Audiomonitor basic thought of the present invention is with the receiving unit (signal that mobile terminal receive sends) " binding " of receiving unit of portable terminal (receive base station send signal) and base station together, the data that two receiving units are received for example speech frame are sent into vocoder respectively and are decoded as the pulse code modulation (pcm) speech data, give same loud speaker (Speaker) after again two-way PCM speech data being changed into analog signal through PCM decoder, thereby in a loud speaker, play both sides' content with the working method of duplex.Have speech identifying function equipment or identification software if increase, can realize the automatic recognition of speech, add the record that storage/record equipment can be realized voice.If receive data service, then carry out exporting after the decapsulation.
Referring to shown in Figure 1, Fig. 1 is the logic diagram of audiomonitor.Antenna-feedback system receives simultaneously from the base station with from the signal of portable terminal, radio frequency reception channel is carried out filtering, after low noise amplifies, go out the base station baseband signal along separate routes and monitored the mobile terminal baseband signal, described base station baseband signal is delivered to base station transceiver (BTS) baseband processor, the described mobile terminal baseband signal of being monitored is delivered to portable terminal (MS) baseband processor, under internal command that central controller is exported and the control of controlling signaling, BTS baseband processor and MS baseband processor are carried out the base band Business Processing respectively, comprise demultiplexing, despreading, demodulation, deinterleaving, and decoding (convolution code, Turbo code) processing such as, the service signal of output is further processed by Service Processing Unit under the control of central controller.For example, if voice signal, then delivering to Q Qualcomm Code Excited Linear Prediction (QCELP) (QCELP) conversion speech signal is the PCM speech data, and the data of coding/decoding module output output to peripheral hardware by data-interface, restore voice signal and deliver to loud speaker or earphone; Perhaps speech data is delivered to speech recognition device by data-interface, can realize the identification to specific voice.If the decapsulation of packet is then carried out in data service with decapsulation module, recover the data in base station signal and the quilt monitoring portable terminal signal.
Below with an embodiment audiomonitor of the present invention is described.This embodiment is based on the audiomonitor of double reception antenna system, in the application of reality, be not limited only to this, the replacement that can be equal to according to the principle of audiomonitor, for example, the monitoring of base station signal and the monitoring of being monitored mobile device are designed to respectively two independently the unit also can.
Referring to shown in Figure 2, Fig. 2 is the schematic diagram that audiomonitor constitutes.Audiomonitor comprises power module (not shown), antenna-feedback system, receiver module, RF front-end module, baseband processing module, 2/ layer 3 on layer and main control module, main frame (HOST) and loud speaker composition, also can comprise storage and/or sound identification module, be abbreviated as storage/sound identification module.Audiomonitor satisfies " TIA/EIA IS-2000-A " protocol requirement on Um Interface, do not need to link to each other with BSC or MSC, and owing to audiomonitor received signal only, do not provide emission function, so the volume of equipment and power consumption will significantly reduce.
For reducing multipath fading, above-mentioned antenna-feedback system is the double reception antenna, and in order to save number of antennas, two main each other diversity of antenna provide main, diversity reception for two band link signals simultaneously.Configuration reception antenna of different frequency range or multiband aerial can be realized the reception to the designated frequency band wireless signal, as when the 800M, and frequency range low side: 825MHz～835MHz, high-end: 870MHz～880MHz.
Constitute radio frequency double reception passage by RF front-end module and receiver module, RF front-end module is made up of filter unit (RDU), low noise amplifier unit (LNA), and the RDU unit comprises main collection receiving filter and diversity reception filter.Main, diversity reception filter receives the signal that receives from master, diversity antenna respectively, carries out filtering through master, diversity reception filter in the RDU, gives LNA then and carries out the low noise amplification and go out base station signal along separate routes and monitored the portable terminal signal.The LNA unit comprises 2 tunnel low noise amplifiers independently, finishes that low noise main, diversity signal amplifies and the shunt of signal, amplifies for the frequency-selecting of receiver module.
The receiver module has binary channels, is merged by radio frequency down-conversion unit and intermediate frequency unit (no up-conversion) to form.The radio frequency down-conversion unit comprises master/diversity reception unit, local frequency source unit, realizes master, diversity signal are carried out analog down, signal amplification, channel selectivity filtering and receive noise factor control.Intermediate frequency unit comprises down-conversion subelement, clock subelement, CPU, power supply subelement, mainly realizes the conversion process function between analog if signal and the digital baseband signal and the processing of clock signal.
Baseband processing unit is mainly finished the demodulation of the low side of reception, high-end link signal base band data, encoding and decoding, air interface physical layer and the mac-layer protocol of channel voice handled.Baseband processing unit comprises BTS baseband processor and MS baseband processor; Also comprise GPS receiver and clock module in the baseband processing unit, the GPS receiver is finished gps signal or number reception of other synchronous satellite, and clock module can provide 16Fc, 50Fc, 10MHz, PP2S isochronon signal.Here, the GPS receive path is independently, and the reception antenna of oneself is arranged; The GPS receiver is incorporate equipment, can also can place layer to handle and main control module for 2/ layer 3 GPS receiver and clock module directly from the gps antenna received signal.In the audiomonitor quantity of baseband processing unit according to this audiomonitor monitor simultaneously be moved the terminal quantity configuration, and the quantity that the base station receives the quantity of baseband processor and mobile terminal baseband processor is about equally or equate.
The former basic service processing capacity that realizes at BSC of 2/ layer of 3 processing modules implement of layer for example comprises that professional frame is selected, the encoding and decoding of information source voice and obtain functions such as signaling control such as relevant information according to link signalling up and down.Main control module achieves a butt joint and receives the control of passage and baseband processing unit.
Main frame is used to monitor and store the data of being monitored portable terminal, for the prison hearer provides user interface, follows the tracks of and monitors by the portable terminal that data base querying or setting are monitored.
The method of monitoring is as follows: the portable terminal that the network operation interface setting that the prison hearer provides by main frame is monitored is also delivered to main control module, the frequency of audiomonitor is set according to the operating frequency of sub-district, the current place of audiomonitor by main control module, make the frequency of audiomonitor identical with the frequency of audiomonitor current area, and configuration and control channel, for example, set up channel, discharge channel, configuration and modification channel parameter etc.; Here, sub-district, the current place of audiomonitor is with to be monitored sub-district, the current place of portable terminal adjacent or in same coverage cell; The double reception antenna receives from the base station with by the signal of monitoring portable terminal and delivers to RF front-end module, master in the RF front-end module, diversity reception filter receive the signal that receives from master, diversity antenna respectively, carry out filtering through master, diversity reception filter in the RDU, give LNA then and carry out the low noise amplification, and be that base station signal and quilt are monitored the portable terminal signal along separate routes, deliver to the receiver module respectively, the receiver module is the base station baseband signal with above-mentioned signal processing and delivers to baseband processing unit after monitoring the mobile terminal baseband signal; Baseband processing unit is controlled the mutual of signaling and internal command with 2/ layer 3 on layer and main control module, 2/ layer of 3 processing module of layer pressed standard agreement processing controls signaling, baseband processing unit carries out the processing of base band business under the control of main control module, deliver to Service Processing Module after disposing, Service Processing Module is according to the kind of business, carrying out corresponding speech business processing or data service handles, export loud speaker to by external interface, or give peripheral apparatus storage, or directly connect speech recognition apparatus or software is analyzed in order to post analysis; 2/ layer 3 on layer and main control module also can be controlled the mutual of signaling and internal command with main frame, carry out the respective handling of basic service, and deliver to host stores for inquiry.The service signal of above-mentioned reception is if voice signal then through tone decoding and the conversion of PCM sign indicating number type, can play back the voice of monitoring both sides by loud speaker or earphone; If data-signal, for example short message etc. then can be stored.
In the above-mentioned audiomonitor course of work, the process of main control module configuration and control channel is as follows:
When audiomonitor enters the cdma cellular network coverage area in mode such as vehicle-mounted, on the frequency that is provided with, start search utility and search for all possible pilot channel, way of search can be used similar and start search pattern mobile phone, search the pilot tone common signal channel of sub-district, audiomonitor place, behind synchronous common channels and the paging common signal channel, with parameter in the Overhead Message (Overhead Message) such as CDMA Channel quantity (CDMA Channel), paging channel number parameters such as (Paging Channel) is taken out, with related parameter being arranged and set up with lower channel among the Overhead Message with reference to the configuration of common channel of audiomonitor place current area:
1), configuration is corresponding to the channel of portable terminal,, sets up Forward Pilot Channel (F-Pilot), Forward Sync Channel (F-Sync) and forward direction paging channels such as (F-Paging) that is;
2), configuration is corresponding to the receive channel of base station, set up the Reverse Access Channel (R-ACH) that equates with corresponding current area Reverse Access Channel (R-ACH) number, promptly, if current area has only a R-ACH channel, just set up a R-ACH channel, if a plurality of R-ACH channels are arranged, just set up a plurality of R-ACH channels; For example, current area has 8 R-ACH channels, then disposes 8 R-ACH channels.
Start search, demodulation software then, begin up, down channel in the cell coverage area of place are monitored.
When quilt monitoring portable terminal begins to make a call or is called, audiomonitor is according to the terminal channel data that listen to, as Terminal Equipment Identifier IMSI (international mobile terminal identification), or ESN (electronics string number), or UIMID parameters such as (Subscriber Identity Modules) is set up forward traffic channel (F-FCH) and the reverse traffic channel (R-FCH) of being monitored portable terminal, this forward traffic channel (F-FCH) is identical with the data of normally setting up the channel needs with reverse traffic channel (R-FCH), only be pure reception, that is: receive the base station by F-FCH and issue the service signal that this is monitored portable terminal; Receive quilt monitoring portable terminal by R-FCH and issue the service in base station signal.
In the process of monitoring, when being switched by the monitoring portable terminal, audiomonitor is found to be monitored the area of coverage that portable terminal moves to another base station possibly from the in-band signalling of being monitored portable terminal, and it moves audiomonitor with tight tracking, keeps the continuity of monitoring; And in conjunction with the basic fixed position technology of Cellular Networks, the cell identification of network side MSC (CELL_ID) positioning function for example, at first determine by eavesdropping target's approximate location, and this positional information is issued audiomonitor by other available communication equipments and means, audiomonitor is by finding approximate location as GIS-Geographic Information System (GIS) according to this positional information then, and move to by monitoring portable terminal neighbor cell or same cells, closely monitor, thereby keep the continuity of monitoring.
Aerial monitor method provided by the present invention is applicable to professional unencrypted mechanism, if the business of communicating pair is encrypted, needs to collect the relevant data of UIM card of being monitored portable terminal to the operator place, and will realize the encryption and decryption algorithm of being correlated with.
Claims (19)
1, a kind ofly realize the aerial method of monitoring, it is characterized in that this method comprises,
A) it is identical with the frequency of audiomonitor current area the frequency of audiomonitor to be set, the common signal channel of search sub-district, audiomonitor place;
B) according to the configuration of common channel of search, set up corresponding to the receive channel of being monitored portable terminal with corresponding to the receive channel of base station, the up-downgoing channel in the monitoring current area scope,
C) according to the field contents that comprises in the signaling that monitors, set up forward traffic channel and the reverse traffic channel of being monitored portable terminal, receive the base station by forward traffic channel and issue the signal that this is monitored portable terminal; Receive quilt monitoring portable terminal by reverse traffic channel and issue signal of base station;
D) base station signal of demodulation step C reception and quilt are monitored the signal of portable terminal, export after handling with the base station signal after the demodulation with by the signal of monitoring portable terminal.
2, the method for claim 1 is characterized in that, described common signal channel is pilot tone common signal channel, synchronous common channels and paging common signal channel.
3, method as claimed in claim 2, it is characterized in that, step B further comprises, take the parameter among the Overhead Message Overhead Message, and reference pilot common signal channel, synchronous common channels and paging configuration of common channel are set up corresponding to the receive channel of being monitored portable terminal with corresponding to the receive channel of base station.
4, the method for claim 1 is characterized in that, step B is described to comprise Forward Pilot Channel, Forward Sync Channel and Forward Paging Channel corresponding to the receive channel of being monitored portable terminal; Described receive channel corresponding to the base station is a Reverse Access Channel, and the number of Reverse Access Channel equates with audiomonitor current area Reverse Access Channel number.
5, the method for claim 1 is characterized in that, the described field contents of step C comprises at least, international mobile terminal identification or electronics string number or Subscriber Identity Module.
6, the method for claim 1, it is characterized in that, the described processing of step D comprises, carries out tone decoding with the base station signal after the demodulation with by the voice signal in the signal of monitoring portable terminal, with the base station signal after the demodulation with by the data-signal decapsulation in the signal of monitoring portable terminal.
7, the method for claim 1, it is characterized in that, if being monitored portable terminal switches, further comprise before the steps A, network side mobile switching centre starts the cell identification positioning function, give audiomonitor with obtaining the reporting position of being monitored portable terminal, audiomonitor moves to neighbor cell or the same cells of being monitored portable terminal.
8, the method for claim 1 is characterized in that, described base station signal is speech business signal and/or data service signal, and the described signal of being monitored portable terminal is speech business signal and/or data service signal.
9, a kind of audiomonitor of realizing aerial monitoring is characterized in that this equipment comprises power module, antenna-feedback system, radio frequency reception channel, baseband processing unit, central controller, Service Processing Unit and ancillary equipment; Wherein, central controller links to each other with baseband processing unit and Service Processing Unit, and power module provides working power for antenna-feedback system, radio frequency reception channel, baseband processing unit, central controller, Service Processing Unit and ancillary equipment;
Described antenna-feedback system receives from signal of base station simultaneously and is exported behind the signal of monitoring portable terminal;
Radio frequency reception channel receives the output of antenna-feedback system and handles, and output base station baseband signal and quilt are monitored the mobile terminal baseband signal to baseband processing unit;
Baseband processing unit receives the control command of central controller output, and demodulation base station baseband signal and quilt are monitored the mobile terminal baseband signal, and export Service Processing Unit to;
Service Processing Unit receives the Business Processing order of central controller output, exports ancillary equipment to by interface after treatment with the base station baseband signal after the demodulation with by monitoring mobile terminal baseband signal.
10, audiomonitor as claimed in claim 9 is characterized in that, described Service Processing Unit is an audio coder ﹠ decoder (codec), with the base station signal after the demodulation with by monitoring portable terminal signal decoding, is converted to pulse code modulation data output.
11, audiomonitor as claimed in claim 9, it is characterized in that, described Service Processing Unit is a decapsulation module, with the base station signal after the demodulation with monitored the decapsulation of portable terminal signal, recovers base station signal and is monitored data content output in the signal of portable terminal.
12, as claim 8,10 or 11 described audiomonitors, it is characterized in that, described radio frequency reception channel is a radio frequency double reception passage, comprise RF front-end module and receiver module, wherein, RF front-end module receives the output of antenna-feedback system, after carrying out amplification of filtering and low noise and shunt processing, export base station signal respectively and monitored the portable terminal signal to the receiver module, the receiver module is carried out radio frequency down-conversion and intermediate frequency process, exports the base station baseband signal respectively and is monitored the mobile terminal baseband signal.
13, audiomonitor as claimed in claim 12, it is characterized in that, described RF front-end module comprises filter cell and low noise amplifier unit, wherein, filter unit receives the output of antenna-feedback system, carry out exporting the low noise amplifier unit to after the filtering, export receiver to after the low noise amplifier unit amplifies.
14, audiomonitor as claimed in claim 13 is characterized in that, described antenna-feedback system is the double reception antenna of main each other collection and diversity.
15, audiomonitor as claimed in claim 14, it is characterized in that, described filter cell comprises, main collection receiving filter and diversity reception filter, described low noise amplifier unit two independent amplifier circuit in low noise, wherein, signal that the main collection antenna of main collection receiving filter filtering receives and diversity reception filter be the signal of filtering diversity antenna reception respectively, the signal of filtered main collection antenna reception and the signal of diversity antenna reception are delivered to amplifier circuit in low noise respectively, and amplifier circuit in low noise is exported the main collection signal in base station respectively, the base station diversity signal, being monitored the portable terminal master collects signal and is monitored the portable terminal diversity signal.
16, as claim 9 or 14 described audiomonitors, it is characterized in that, described baseband processing unit comprises, base station transceiver baseband processor and mobile terminal baseband processor, wherein, the base station baseband signal of base station transceiver baseband processor received RF double reception passage output carries out exporting after the Base-Band Processing, the quilt of mobile terminal baseband processor received RF double reception passage output is monitored the mobile terminal baseband signal, carries out exporting after the Base-Band Processing.
17, audiomonitor as claimed in claim 9 is characterized in that, described baseband processing unit also comprises GPS receiver and clock module, and described GPS receiver receives gps signal, and described clock module provides clock signal.
18, audiomonitor as claimed in claim 9 is characterized in that, described central controller comprises layer 2/ layer 3 and main control module and main frame, and wherein, 2/ layer 3 on this layer and main control module are connected respectively with main frame with baseband processing unit.
19, audiomonitor as claimed in claim 9 is characterized in that, described ancillary equipment comprises storage/sound identification module, and/or loud speaker, and/or earphone.
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| CNB031536158A CN100486145C (en) | 2003-08-15 | 2003-08-15 | Method and device for realizing air monitoring |
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| CNB031536158A CN100486145C (en) | 2003-08-15 | 2003-08-15 | Method and device for realizing air monitoring |
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| CN100486145C true CN100486145C (en) | 2009-05-06 |
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| CNB031536158A Expired - Fee Related CN100486145C (en) | 2003-08-15 | 2003-08-15 | Method and device for realizing air monitoring |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454850C (en) * | 2005-09-27 | 2009-01-21 | 华为技术有限公司 | System and method for carrying out monitoring on mobile IP user |
| CN101141176B (en) * | 2007-09-27 | 2010-08-11 | 北京航空航天大学 | Distributed acquisition multi-access method |
| CN101488954A (en) * | 2009-01-09 | 2009-07-22 | 中兴通讯股份有限公司 | Speech monitoring method and access gateway |
| CN105024769A (en) * | 2015-06-25 | 2015-11-04 | 大唐移动通信设备有限公司 | Monitoring device |
| CN106021160A (en) * | 2016-05-16 | 2016-10-12 | 江苏沁恒股份有限公司 | USB signal monitoring apparatus and monitoring method |
| CN107465668A (en) * | 2017-07-17 | 2017-12-12 | 广州慧睿思通信息科技有限公司 | A kind of GSM mobile handset speech monitoring method |
| US20220022134A1 (en) * | 2018-12-05 | 2022-01-20 | Beijing Xiaomi Mobile Software Co., Ltd. | Downlink channel monitoring method, terminal, base station and storage medium |
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