CN109348489B - TD-LTE terminal detection system - Google Patents
TD-LTE terminal detection system Download PDFInfo
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- CN109348489B CN109348489B CN201811480723.0A CN201811480723A CN109348489B CN 109348489 B CN109348489 B CN 109348489B CN 201811480723 A CN201811480723 A CN 201811480723A CN 109348489 B CN109348489 B CN 109348489B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
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- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/20—Performing reselection for specific purposes for optimising the interference level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/24—Reselection being triggered by specific parameters
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Abstract
The invention discloses a TD-LTE terminal detection system. The system comprises: the system comprises a main controller and TD-LTE terminal detection equipment; the main controller configures the current working frequency point of the target mobile phone terminal to a synchronous detection module and an LTE base station module, configures the public network frequency point to the synchronous detection module and a synchronous interference module, and synchronously detects according to the public network frequency point by the synchronous detection module to obtain the synchronous position of the public network frequency point corresponding to a public network base station cell; and the synchronous interference module generates synchronous interference signals according to the public network frequency points, and after the synchronous interference signals are transmitted to the public network frequency points at the synchronous position of the public network base station cell, the target mobile phone terminal detects that other base station modules cannot be connected, and then reselects the current working frequency point of the target mobile phone terminal to the current working frequency point of the LTE base station module. The TD-LTE detection equipment achieves the technical effect of detecting and identifying all mobile phone terminals in the current coverage area.
Description
Technical Field
The embodiment of the invention relates to a mobile communication technology, in particular to a TD-LTE terminal detection system.
Background
The Time Division Long Term Evolution (TD-LTE) terminal detection device is mainly applied to short-distance mobile terminal detection, the detection distance is generally about 20 meters, and application scenes comprise scenes such as subways, buses and large-scale exhibitions.
At present, most common TD-LTE terminal detection equipment can only work at a single frequency band and a single frequency point at the same time, or the TD-LTE terminal detection equipment provides a detachable broadband power amplifier module, and the broadband power amplifier module is hung at the frequency band of a mobile terminal, but the detachment is inconvenient. Meanwhile, currently, the China Mobile TD-LTE already covers a plurality of frequency bands, the coverage of a plurality of frequency bands and a plurality of frequency bands at the same place is normal, the switching of the mobile phone terminals between a plurality of public network cells and the plurality of frequency bands is also a normal matter, if the TD-LTE detection equipment only supports a single frequency band and a single frequency band, the practical application requirements can not be met in a plurality of scenes, and all the mobile phone terminals in the coverage area can not be identified.
Disclosure of Invention
In view of this, the invention provides a TD-LTE terminal detection system, which achieves the technical effect that TD-LTE detection equipment can detect and identify all mobile phone terminals in the current coverage area.
In a first aspect, an embodiment of the present invention provides a TD-LTE terminal detection system, including: the system comprises a main controller and TD-LTE terminal detection equipment; the TD-LTE terminal detection equipment comprises a baseband processor; the baseband processor comprises an LTE base station module, a synchronous detection module and a synchronous interference module; the main controller is respectively connected with the LTE base station module, the synchronous detection module and the synchronous interference module;
the main controller configures the current working frequency point of a target mobile phone terminal to the synchronous detection module and the LTE base station module, and configures a public network frequency point to the synchronous detection module and the synchronous interference module, and the synchronous detection module carries out synchronous detection according to the public network frequency point to obtain the synchronous position of the public network frequency point corresponding to a public network base station cell; and the synchronous interference module generates synchronous interference signals according to the public network frequency points, and after the synchronous interference signals are transmitted to the public network frequency points at the synchronous positions of the public network base station cells, if a target mobile phone terminal detects that the target mobile phone terminal cannot be connected with other base station modules, the current working frequency point of the target mobile phone terminal is reselected to the current working frequency point of the LTE base station module.
Further, after the synchronous interference module transmits a synchronous interference signal to the public network frequency point at the synchronous position of the public network base station cell, the signal-to-noise ratio of the synchronous signal corresponding to the public network frequency point is lower than a preset cell reselection threshold.
Further, the synchronous interference signals are PSS interference signals and SSS interference signals.
Further, the TD-LTE terminal detection device further includes: the FPGA module is respectively connected with the LTE base station module and the synchronous detection module;
the FPGA module executes digital up-conversion, converts the multi-channel baseband signals generated by the LTE base station module and the multi-channel baseband signals generated by the synchronous detection module into digital intermediate-frequency signals and sends the digital intermediate-frequency signals to the radio frequency module;
the FPGA module executes digital down conversion, converts a digital intermediate frequency signal sent by the radio frequency module into a baseband signal, and sends the baseband signal to the LTE base station module and the synchronous detection module.
Further, the TD-LTE terminal detection device further includes: the radio frequency module is connected with the FPGA module; the radio frequency module comprises an analog-to-digital conversion module, a digital-to-analog conversion module and a filtering amplification module;
the filtering and amplifying module is used for filtering and amplifying the radio-frequency signal sent by the receiving antenna to obtain an analog intermediate-frequency signal; performing analog-to-digital conversion on the analog intermediate-frequency signal through an analog-to-digital conversion module to obtain a digital intermediate-frequency signal, and sending the digital intermediate-frequency signal to the FPGA module;
and the digital-to-analog conversion module is used for performing digital-to-analog conversion on the digital intermediate-frequency signal sent by the FPGA module to obtain an analog intermediate-frequency signal, and the filtering amplification module is used for filtering, amplifying and modulating the analog intermediate-frequency signal to a radio-frequency signal and sending the radio-frequency signal to the broadband power amplification module.
Further, the TD-LTE terminal detection device further includes: the broadband power amplifier module is connected with the radio frequency module;
the broadband power amplifier module amplifies the power of the radio-frequency signal sent by the radio-frequency module and sends the radio-frequency signal obtained after power amplification to the transmitting antenna.
Further, configuring the LTE base station module in a single cell; and the LTE base station module carries out signaling interaction with a target mobile phone terminal.
Further, the frequency band of the LTE base station module includes: band38, band38, band40, and band 41.
Furthermore, the transmitting power of the broadband power amplifier module is 1 watt.
Further, the main controller is a mobile phone terminal or a tablet computer.
According to the invention, a synchronous detection module and a synchronous interference module are arranged in TD-LTE terminal detection equipment, when a main controller configures a current working frequency point of a target mobile phone terminal to the synchronous detection module and an LTE base station module, and configures a public network frequency point to the synchronous detection module and the synchronous interference module, the synchronous detection module carries out synchronous detection according to the public network frequency point to obtain a synchronous position of the public network frequency point corresponding to a public network base station cell; the synchronous interference module generates synchronous interference signals according to the public network frequency points, and after the synchronous interference signals are transmitted to the public network frequency points at the synchronous positions of the public network base station cells, the target mobile phone terminal detects that other base station modules cannot be connected, the current working frequency point of the target mobile phone terminal is reselected to the current working frequency point of the LTE base station module, and the technical effect that the TD-LTE detection equipment can detect and identify all mobile phone terminals in the current coverage area is achieved.
Drawings
Fig. 1 is a block diagram of a TD-LTE terminal detection system according to an embodiment of the present invention;
fig. 2 is a schematic display diagram of a target mobile phone terminal switching working frequency point according to an embodiment of the present invention;
fig. 3 is a block diagram of a TD-LTE terminal detection system according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the TD-LTE terminal detection device in the prior art is not configured to be in multiple frequency bands mainly because of the limitation of portable scenarios, and the storage and processing capability of the baseband processor in the TD-LTE terminal detection device are limited, and concurrent multi-cell operation cannot be supported within one baseband chip. If the number of the baseband processors is increased, the power consumption of the TD-LTE terminal detection device is greatly increased, which causes the problems of increased battery capacity and increased heat dissipation, and reduces the portability. At present, most TD-LTE terminal detection equipment adopts a single-frequency-band power amplifier similar to a macro base station, and has good index performance, but in order to achieve the purpose of supporting multiple frequency bands, the TD-LTE terminal detection equipment needs to be additionally provided with a plurality of broadband power amplifier modules, so that the power consumption of the TD-LTE terminal detection equipment is high, and the TD-LTE terminal detection equipment is inconvenient to carry. In order to solve the problem that TD-LTE terminal detection equipment in the prior art does not support multi-band multi-frequency points, a TD-LTE terminal detection system is provided.
Example one
Fig. 1 is a block diagram of a TD-LTE terminal detection system according to an embodiment of the present invention, where the TD-LTE terminal detection system provided in this embodiment may be suitable for detecting and identifying scenes of all mobile terminals in a coverage area. Referring to fig. 1, the TD-LTE terminal detection system includes: a main controller 10 and a TD-LTE terminal detection device 20.
The TD-LTE terminal detection device 20 includes a baseband processor 201; the baseband processor 201 includes a Long Term Evolution (LTE) base station module 2011, a synchronous detection module 2012 and a synchronous interference module 2013; the main controller 10 is connected to the LTE base station module 2011, the sync detection module 2012 and the sync interference module 2013, respectively.
In the embodiment, the main controller 10 configures the current working frequency point of the target mobile phone terminal to the synchronous detection module 2012 and the LTE base station module 2011, configures the public network frequency point to the synchronous detection module 2012 and the synchronous interference module 2013, and the synchronous detection module 2012 performs synchronous detection according to the public network frequency point to obtain the synchronous position of the public network frequency point corresponding to the public network base station cell; the synchronous interference module 2013 generates a synchronous interference signal according to the public network frequency point, and after the synchronous interference signal is transmitted to the public network frequency point at the synchronous position of the public network base station cell, if the target mobile phone terminal detects that the target mobile phone terminal cannot be connected with other base station modules, the current working frequency point of the target mobile phone terminal is reselected to the current working frequency point of the LTE base station module 2011.
It should be noted that before the main controller 10 configures the current working frequency point of the target mobile phone terminal to the synchronous detection module 2012, all frequency bands and frequency points corresponding to the public network cell where the TD-LTE terminal detection device 20 is currently located are acquired through the industrial module terminal, then one frequency band is selected from all the acquired frequency bands and frequency points as a main frequency band, one frequency point is selected from the main frequency band as a main frequency point, the main frequency point is configured to the TD-LTE terminal detection device 20 to be used as the working frequency point of the TD-LTE terminal detection device 20, so that the TD-LTE terminal detection device 20 detects and identifies the mobile phone terminal according to the working frequency point. The industrial and modular terminal may be a mobile phone terminal or a tablet computer, which is not limited herein. In an embodiment, the main controller 10 is a mobile phone terminal or a tablet computer. Certainly, the tool and module terminal and the main controller 10 may be the same terminal device, that is, the tool and module terminal and the main controller 10 may be the same mobile phone terminal or the same tablet computer. It should be noted here that, in order to acquire all frequency bands and frequency points corresponding to the public network cell where the TD-LTE terminal detection device 20 is currently located through the industrial module terminal, a base station acquisition APP needs to be installed in the industrial module terminal, acquire all frequency bands and frequency points corresponding to the public network cell where the industrial module terminal is currently located through the base station acquisition APP, and configure the selected main frequency band and main frequency point to the TD-LTE terminal detection device 20. Certainly, a base station acquisition APP is also installed in the mobile phone terminal or the tablet computer serving as the main controller 10, and the LTE base station of the current public network cell and LTE base stations of other peripheral public network cells are acquired through the base station acquisition APP.
The LTE base station module 2011 is configured in a single cell, and it can be understood that one LTE base station module 2011 is configured in each public network cell. In an embodiment, the LTE base station module 2011 is configured to simulate an LTE base station and perform signal processing of the LTE base station, for example, complete signaling interaction with a mobile terminal, broadcast transmission, preamble detection and uplink access signal processing. The signaling interaction refers to transmission of data information between the LTE base station module 2011 and the mobile phone terminal; the broadcast transmission refers to that the LTE base station module 2011 transmits a synchronization signal to a mobile phone terminal; preamble detection refers to a process of configuring a working frequency band and a working frequency point for the LTE base station module 2011 according to a working module terminal; the uplink access signal processing refers to a process of processing a signal transmitted by the main controller 10 or the industrial module terminal.
Here, the synchronization detection module 2012 is connected to the LTE base station module 2011 and the synchronous interference module 2013, respectively. In the embodiment, a base station of the main controller 10 acquires an APP to obtain a current working frequency point (current working frequency point 1) and peripheral public network frequency points of a target mobile phone terminal, configures the current working frequency point 1 and the peripheral public network frequency points to the synchronous detection module 2012, and triggers the synchronous detection module 2012 to synchronously detect the current working frequency point 1 to obtain a synchronous position of the current working frequency point 1 corresponding to a public network base station cell; and meanwhile, the synchronous detection module 2012 is triggered to perform synchronous detection according to the peripheral public network frequency points to obtain the synchronous positions of the peripheral public network frequency points corresponding to the public network base station cells. Of course, the main controller 10 also configures the current working frequency point of the target mobile phone terminal to the LTE base station module 2011 and configures the public network frequency point to the synchronous interference module 2013, so that the LTE base station module 2011 creates a cell of the target frequency point according to the current working frequency point of the target mobile phone terminal, and the synchronous interference module 2013 generates a synchronous interference signal corresponding to the synchronous position of the public network base station cell according to the peripheral public network frequency point. And the target frequency point is the current working frequency point of the target mobile phone terminal. In order to distinguish the current working frequency point of the target mobile phone terminal from the current working frequency point of the LTE base station module conveniently in the process of describing the technical scheme, in the embodiment, the current working frequency point of the target mobile phone terminal is recorded as a current working frequency point 1, and the current working frequency point of the LTE base station module is recorded as a current working frequency point 2. It should be noted that, after the current working frequency point of the target mobile phone terminal is configured to the LTE base station module, the current working frequency point of the LTE base station module is switched from the dominant frequency point configured by the industrial and modular terminal to the current working frequency point 1.
In an embodiment, after the LTE base station module 2011 creates a cell of a target frequency point according to the current working frequency point 1, the LTE base station module 2011 transmits a synchronization signal according to the target frequency point. The synchronous signals only appear at the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS), which can be understood as that the time of the synchronous signals appearing is very short, and correspondingly, the time of the synchronous interference signals appearing transmitted by the synchronous interference module 2013 is also very short, that is, the signals transmitted by the peripheral public network base stations can be disturbed by the burst high-power Synchronization, and when the synchronous signals are in the asynchronous Signal transmission time, the synchronous interference signals do not need to be transmitted, so that the power consumption of the TD-LTE terminal detection device 20 is reduced, and the detection efficiency is improved. Wherein, the synchronous signals are PSS signals and/or SSS signals. Accordingly, the synchronous interference signals may also be PSS interference signals and/or SSS interference signals. It should be noted that, in the synchronous interference method, considering that the PSS and SSS sequences have the capability of resisting white noise interference, in the embodiment, a PSS signal and/or an SSS signal is used as a synchronous signal, and a PSS interference signal and/or an SSS interference signal is used as a synchronous interference signal. If single white noise is used, the transmitting power of the TD-LTE terminal detection equipment must be far greater than the transmitting power of a public network base station corresponding to a public network frequency point, so that the transmitting power of the TD-LTE terminal detection equipment is very large, the power consumption of the TD-LTE terminal detection equipment is also very large, the size of the TD-LTE terminal detection equipment is also very large, and the TD-LTE terminal detection equipment is inconvenient to carry.
It should be noted that, in the synchronous interference module 2013, not only the synchronous interference signals are transmitted to the peripheral public network frequency points, but also the synchronous interference signals are transmitted to other frequency points except the target frequency point in the public network cell where the TD-LTE terminal detection device is located. Because the interference operation sequence is fixed, the operation amount is small, so that the synchronous interference module 2013 is added in the TD-LTE terminal detection device 20, and no excessive data processing burden is added to the baseband processor 201.
In an embodiment, after the synchronous interference module 2013 transmits a synchronous interference signal to the public network frequency point at the synchronous position of the public network base station cell, the signal-to-noise ratio of the synchronous signal corresponding to the public network frequency point is lower than a preset cell reselection threshold. The preset cell re-threshold is set by using Reference Signal Receiving Power (Reference Signal Receiving Power, RSRP) and Reference Signal Receiving Quality (Reference Signal Receiving Quality, RSRQ) as Reference standards. In the embodiment, the preset cell reselection threshold may be understood as that RSRP and RSRQ of a public network base station cell where surrounding public network frequency points are located are smaller than threshold Th of RSRP and RSRQ of a public network cell where the TD-LTE terminal detection device 20 is currently located. It can also be understood that the signal-to-noise ratio of the synchronization signal corresponding to the public network frequency point may decrease to exceed the preset cell reselection threshold Th, for example, in an embodiment, the preset cell reselection threshold Th may be configured to be 3dB, that is, RSRP and RSRQ of the public network base station cell where the peripheral public network frequency point is located are 3dB lower than RSRP and RSRQ of the public network cell where the TD-LTE terminal detection device 20 is currently located. When the RSRQ of the base station cell of the public network where the peripheral public network frequency point is located is lower than that of the peripheral public network frequency point cell by more than 3dB, the target mobile phone terminal registered to the peripheral public network frequency point can execute cell reselection, and therefore other frequency points are reselected. As the RSRQ of the public network base station cell where the peripheral public network frequency point is located drops to more than 3dB, the target mobile phone terminal cannot be connected to the peripheral public network frequency point, that is, the target mobile phone terminal cannot be connected to other base station modules, and finally enters the current working frequency point of the LTE base station module 2011. Certainly, in order to perform cell reselection on a target mobile phone terminal registered in a peripheral public network base station cell, the LTE base station module 2011 enables the target mobile phone terminal to reselect a current working frequency point of the LTE base station module 2011 through close-range high-power coverage. After the target mobile phone terminal is switched to the current working frequency point of the LTE base station module 2011, the target mobile phone terminal is accessed to the LTE base station module 2011, so that the LTE base station module 2011 can perform signaling interaction with the target mobile phone terminal through a signaling interaction flow, and further, the TD-LTE terminal detection device 20 can perform security detection on the target mobile phone terminal. Fig. 2 is a schematic display diagram of switching working frequency points of a target mobile phone terminal according to an embodiment of the present invention. Referring to fig. 2, exemplarily, it is assumed that there are four LTE base stations, namely an LTE base station 210 and an LTE base station 220, near a public network cell where the TD-LTE terminal detection device is currently located, and meanwhile, an LTE base station corresponding to the public network cell where the TD-LTE terminal detection device is currently located is an LTE base station 230. The LTE base stations 220 are three, and the LTE base station 210 is a base station to which the target mobile phone terminal 240 is connected before entering the public network cell where the TD-LTE terminal detection device is located. In the embodiment, after the target mobile phone terminal 240 enters the public network cell where the TD-LTE terminal detection device is located, in order to detect and identify the target mobile phone terminal 240 through the TD-LTE terminal detection device, the synchronization detection module and the synchronization interference module need to interfere with the synchronization signals transmitted by the LTE base station 210 and the LTE base station 220, so that the signal-to-noise ratio of the synchronization signals transmitted by the LTE base station 210 and the LTE base station 220 is reduced to exceed the preset cell reselection threshold, so that the target mobile phone terminal 240 cannot be connected to the LTE base station 210 and the LTE base station 220, and is finally connected to the LTE base station 230 of the public network cell where the TD-LTE terminal detection device is located. In order to illustrate that the LTE base station 210 is a base station to which the target mobile phone terminal 240 is connected before entering the public network cell where the TD-LTE terminal detection device is located, a communication relationship between the LTE base station 210 and the target mobile phone terminal 240 is shown by using a dotted line in fig. 2.
According to the technical scheme of the embodiment, a synchronous detection module and a synchronous interference module are arranged in TD-LTE terminal detection equipment, when a main controller configures a current working frequency point of a target mobile phone terminal to the synchronous detection module and an LTE base station module, a public network frequency point is configured to the synchronous detection module and the synchronous interference module, and the synchronous detection module carries out synchronous detection according to the public network frequency point to obtain a synchronous position of the public network frequency point corresponding to a public network base station cell; the synchronous interference module generates synchronous interference signals according to the public network frequency points, and after the synchronous interference signals are transmitted to the public network frequency points at the synchronous positions of the public network base station cells, the target mobile phone terminal detects that other base station modules cannot be connected, the current working frequency point of the target mobile phone terminal is reselected to the current working frequency point of the LTE base station module, and the technical effect that the TD-LTE detection equipment can detect and identify all mobile phone terminals in the current coverage area is achieved.
Example two
Fig. 3 is a block diagram of a TD-LTE terminal detection system according to a second embodiment of the present invention, which further embodies the structure of the TD-LTE terminal detection system based on the first embodiment. Referring to fig. 3, the TD-LTE terminal detecting device in the TD-LTE terminal detecting system further includes: a Field Programmable Gate Array (FPGA) module 202, a radio frequency module 203 and a broadband power amplifier module 204; the rf module 203 includes an analog-to-digital conversion module 2031, a digital-to-analog conversion module 2032, and a filtering and amplifying module 2033.
The FPGA module 202 is connected to the LTE base station module 2011, the synchronous detection module 2012 and the radio frequency module 203 respectively; the broadband power amplifier module 204 is connected with the radio frequency module 203; the filtering and amplifying module 2033 is connected to the analog-to-digital conversion module 2031 and the digital-to-analog conversion module 2032, respectively.
In an embodiment, the FPGA module 202 performs digital up-conversion, converts the multiple baseband signals generated by the LTE base station module 2011 and the multiple baseband signals generated by the synchronous detection module 2012 into digital intermediate frequency signals, and sends the digital intermediate frequency signals to the radio frequency module 203; the FPGA module 202 performs digital down conversion, converts the digital intermediate frequency signal sent by the radio frequency module 203 into a baseband signal, and sends the baseband signal to the LTE base station module 2011 and the synchronization detection module 2012.
The filtering and amplifying module 2033 performs filtering and amplifying on the radio frequency signal sent by the receiving antenna to obtain an analog intermediate frequency signal; performing analog-to-digital conversion on the analog intermediate-frequency signal through the analog-to-digital conversion module 2031 to obtain a digital intermediate-frequency signal, and sending the digital intermediate-frequency signal to the FPGA module 202; the digital-to-analog conversion module 2032 performs digital-to-analog conversion on the digital intermediate frequency signal sent by the FPGA module 202 to obtain an analog intermediate frequency signal, and the filtering and amplifying module 2033 performs filtering, amplifying and modulating on the analog intermediate frequency signal to a radio frequency signal, and sends the radio frequency signal to the broadband power amplifier module 204.
The broadband power amplifier module 204 amplifies the power of the radio frequency signal sent by the radio frequency module 203, and sends the radio frequency signal obtained after power amplification to the transmitting antenna.
It should be noted that, when the FPGA module 202 performs digital up-conversion, the multiple baseband signals generated by the LTE base station module 2011 are the multiple baseband signals sent to the target mobile phone terminal; the multi-channel baseband signal generated by the synchronization detection module 2012 is the multi-channel baseband signal sent to the LTE base station module corresponding to the peripheral public network base station cell. Correspondingly, when the FPGA module 202 executes digital down-conversion, the baseband signal sent to the LTE base station module 2011 is a signal sent by the target mobile phone terminal; the baseband signal sent to the synchronization detection module 2012 is a signal sent by an LTE base station module corresponding to a peripheral public network base station cell.
In the embodiment, after the radio frequency module 203 receives a radio frequency signal sent by a receiving antenna, the radio frequency signal is filtered and amplified by the filtering and amplifying module 2033, so that a high-frequency radio frequency signal is demodulated to an intermediate-frequency analog intermediate-frequency signal, then the analog intermediate-frequency signal is analog-to-digital converted by the analog-to-digital conversion module 2031 to obtain a corresponding digital intermediate-frequency signal, and the digital intermediate-frequency signal is sent to the FPGA module 202, then the FPGA module 202 performs digital down-conversion to convert the received digital intermediate-frequency signal into a baseband signal, and sends the baseband signal to the LTE base station module 2011 and the synchronization detection module 2012, and then sends a synchronization signal through the LTE base station module 2011, and the synchronization detection module 2012 detects a synchronization position of a public network base station cell corresponding to a peripheral public network frequency point, and sends the synchronization position to the synchronization interference module 2013, so as to send a synchronization interference signal through the synchronization interference module 2013, therefore, the current working frequency point of the target mobile phone terminal is switched to the current working frequency point of the LTE base station module 2011, so that the target mobile phone terminal is detected safely by the TD-LTE terminal detection device 20. The purpose of down-conversion is to reduce the carrier frequency of the digital intermediate frequency signal or directly remove the carrier frequency to obtain a baseband signal.
Likewise, after the FPGA module 202 receives the multiple baseband signals generated by the LTE base station module 2011 and the multiple baseband signals generated by the sync detection module 2012, performs digital up-conversion, converts the multiple baseband signals into digital intermediate frequency signals, and sends the digital intermediate frequency signals to the rf module 203, then, the digital-to-analog conversion module 2032 in the radio frequency module 203 performs digital-to-analog conversion on the digital intermediate frequency signal to obtain an analog intermediate frequency signal, the analog intermediate frequency signal is filtered, amplified and modulated to a radio frequency signal by the filtering and amplifying module 2033, and the radio frequency signal is sent to the broadband power amplifier module 204, the broadband power amplifier module 204 amplifies the power of the radio frequency signal, sends the radio frequency signal after power amplification to a transmitting antenna, and transmitting the radio frequency signal after power amplification to a target mobile phone terminal and a peripheral public network base station cell through a transmitting antenna. The up-conversion is to change an input signal with a certain frequency into an output signal with a higher frequency. In an embodiment, the FPGA module 202 performs digital up-conversion, i.e., converts multiple baseband signals into a higher frequency digital intermediate frequency signal.
It should be noted that the TD-LTE terminal detection device does not need to process data information related to a user, and is only used to support LTE uplink and downlink high throughput data services, in the embodiment, it is not needed to configure a very high index for an Adjacent Channel Power Ratio (ACPR) and a Peak-to-Average Power Ratio (PAPR) in the broadband Power amplification module 204, and it can be understood that a low-Power broadband Power amplification module can cover multiple frequency bands adopted by the LTE base station module by reducing requirements for ACPR and index PAPR. Wherein, the frequency channel of LTE base station module includes: band38, band38, band40, and band 41. Illustratively, for a single-frequency-band broadband power amplifier module in the prior art, the index of the ACPR needs to reach-52 dBc, whereas for a low-power broadband power amplifier in the scheme, the index of the ACPR only needs to reach-45 dBc. Similarly, for the single-frequency-band broadband power amplifier module in the prior art, the PAPR index needs to reach 12dB, while for the low-power broadband power amplifier in the scheme, the PAPR index only needs to reach 8 dB. In an embodiment, the transmission power of the broadband power amplifier module is 1 watt.
According to the technical scheme of the embodiment, on the basis of the embodiment, by reducing ACPR and PAPR index requirements of the broadband power amplification module, the TD-LTE terminal detection equipment can be configured by the low-power broadband power amplification module, so that the TD-LTE terminal detection equipment can support multiple frequency bands through a single broadband power amplification module, and all mobile phone terminals in the current coverage area can be detected and identified.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A TD-LTE terminal detection system, comprising: the system comprises a main controller and TD-LTE terminal detection equipment; the TD-LTE terminal detection equipment comprises a baseband processor; the baseband processor comprises an LTE base station module, a synchronous detection module and a synchronous interference module; the main controller is respectively connected with the LTE base station module, the synchronous detection module and the synchronous interference module;
the main controller configures the current working frequency point of a target mobile phone terminal to the synchronous detection module and the LTE base station module, and configures a public network frequency point to the synchronous detection module and the synchronous interference module, and the synchronous detection module carries out synchronous detection according to the public network frequency point to obtain the synchronous position of the public network frequency point corresponding to a public network base station cell; the synchronous interference module generates synchronous interference signals according to the public network frequency points, and after the synchronous interference signals are transmitted to the public network frequency points at the synchronous positions of the public network base station cells, if a target mobile phone terminal detects that the other base station modules cannot be connected, the current working frequency point of the target mobile phone terminal is reselected to the current working frequency point of the LTE base station module;
wherein, the TD-LTE terminal detection equipment further comprises: the FPGA module is respectively connected with the LTE base station module and the synchronous detection module;
the FPGA module executes digital up-conversion, converts the multi-channel baseband signals generated by the LTE base station module and the multi-channel baseband signals generated by the synchronous detection module into digital intermediate-frequency signals and sends the digital intermediate-frequency signals to the radio frequency module;
the FPGA module executes digital down conversion, converts a digital intermediate frequency signal sent by the radio frequency module into a baseband signal, and sends the baseband signal to the LTE base station module and the synchronous detection module.
2. The TD-LTE terminal detection system of claim 1, wherein the synchronous interference module transmits a synchronous interference signal to the public network frequency point at a synchronous position of a public network base station cell, and a signal-to-noise ratio of the synchronous signal corresponding to the public network frequency point is lower than a preset cell reselection threshold.
3. The TD-LTE terminal detection system according to claim 1, wherein the synchronous interference signals are PSS interference signals and SSS interference signals.
4. The TD-LTE terminal detection system according to claim 1, wherein the TD-LTE terminal detection device further comprises: the radio frequency module is connected with the FPGA module; the radio frequency module comprises an analog-to-digital conversion module, a digital-to-analog conversion module and a filtering amplification module;
the filtering and amplifying module is used for filtering and amplifying the radio-frequency signal sent by the receiving antenna to obtain an analog intermediate-frequency signal; performing analog-to-digital conversion on the analog intermediate-frequency signal through an analog-to-digital conversion module to obtain a digital intermediate-frequency signal, and sending the digital intermediate-frequency signal to the FPGA module;
and the digital-to-analog conversion module is used for performing digital-to-analog conversion on the digital intermediate-frequency signal sent by the FPGA module to obtain an analog intermediate-frequency signal, and the filtering amplification module is used for filtering, amplifying and modulating the analog intermediate-frequency signal to a radio-frequency signal and sending the radio-frequency signal to the broadband power amplification module.
5. The TD-LTE terminal detection system according to claim 4, wherein the TD-LTE terminal detection apparatus further comprises: the broadband power amplifier module is connected with the radio frequency module;
the broadband power amplifier module amplifies the power of the radio-frequency signal sent by the radio-frequency module and sends the radio-frequency signal obtained after power amplification to the transmitting antenna.
6. The TD-LTE terminal detection system according to claim 1, wherein the LTE base station module is configured in a single cell; and the LTE base station module carries out signaling interaction with a target mobile phone terminal.
7. The TD-LTE terminal detection system according to claim 1, wherein the frequency band of the LTE base station module comprises: band38, band38, band40, and band 41.
8. The TD-LTE terminal detection system according to claim 5, wherein the transmission power of the broadband power amplifier module is 1W.
9. The TD-LTE terminal detection system of claim 1, wherein the master controller is a cell phone terminal or a tablet computer.
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