CN106330373B - Synchronization method and device in interference unit and interference unit - Google Patents
Synchronization method and device in interference unit and interference unit Download PDFInfo
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- CN106330373B CN106330373B CN201510387785.7A CN201510387785A CN106330373B CN 106330373 B CN106330373 B CN 106330373B CN 201510387785 A CN201510387785 A CN 201510387785A CN 106330373 B CN106330373 B CN 106330373B
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Abstract
The invention discloses a synchronization method in an interference unit, which comprises the following steps: tracking a synchronous signal on a reference frequency band to obtain the current frame head position of the reference frequency band; determining the current frame head position of each frequency band according to the time difference between the frame head position of each frequency band and the frame head position of the reference frequency band of the communication system supported by the interference unit and the current frame head position of the reference frequency band; acquiring a frame structure of each frequency band; and sending a synchronous control signal according to the current frame head position and the corresponding frame structure of each frequency band, wherein the synchronous control signal is used for controlling a transmission link in the interference unit to transmit an interference signal. The invention also discloses a synchronizer and an interference unit in the interference unit.
Description
Technical Field
The present invention relates to an interferer technology, and in particular, to a synchronization method and apparatus in an interferer, and an interferer.
Background
In sensitive places such as offices or school test centers, it is necessary to block normal mobile phone communication in a specific area or place for the purpose of security, etc., in this case, an interferer is generally deployed near a target area, fig. 1 is a schematic diagram of a network architecture in the prior art, as shown in fig. 1, generally, an interferer 11 is a high-power wireless signal transmitter, and an interferer 11 continuously transmits high-power interference or noise signals at the same downlink frequency as a base station 12. Therefore, the User Equipment (UE) 13 in the target area 13 receives the normal base station signal and is also strongly interfered by the interferer 11, so that the UE 13 cannot maintain normal downlink communication; at locations 15 outside the target area in the cell, the interfering signals generated by the interferers 11 are very weak, typically much weaker than the useful signals of the base station, so that UEs 16 located at these locations can still maintain normal communication with the base station.
Fig. 2 shows a frame structure in a Time Division Long Term Evolution (TD-LTE) system, and as shown in fig. 2, an equal-length subframe (Sub-frame) structure is adopted in the LTE system: each subframe is 1 millisecond (ms) in length and comprises two time slots with the length of 0.5 ms; the 10 subframes constitute a Radio Frame (Radio Frame) of length 10 ms. Within a Time Division Duplex (TDD) frame, some subframes are downlink and others are uplink. According to the requirements of different coverage scenes, in a radio frame of the TD-LTE system, an uplink transmission common subframe (U), a downlink transmission common subframe (D) and a special subframe (S) can have different configurations. By adjusting the ratio of the uplink subframe number to the downlink subframe number, the TD-LTE system can meet the requirements of different uplink and downlink data transmission service proportions. Table 1 is a configuration table of uplink and downlink subframes for representing allocation of resources in the TD-LTE time domain in the related art, and as shown in table 1, special subframes (S subframes in the above table) are introduced in TD-LTE. In a TD-LTE frame, 1 or 2 special subframes are included for uplink and downlink conversion.
Table 1 uplink and downlink subframe configuration table
Specifically, the special subframe is composed of a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS). The TD-LTE realizes uplink and downlink transmission simultaneously in the same frequency band at the cost of the guard interval GP, which acts like the uplink and downlink frequency guard interval of an FDD system. TD-LTE transmits a primary synchronization channel (PSS) on the DwPTS, and the residual resources can be used for transmitting downlink data; the UpPTS in the TD-LTE can carry a random access channel and an uplink signal quality estimation channel. Table 2 shows a configuration table of a special subframe, as shown in table 2, there are multiple configuration modes for the special timeslot of TD-LTE, and the lengths of DwPTS, GP, and UpPTS may be changed to meet the needs of different scenarios such as coverage, capacity, interference, and the like.
Table 2 configuration table of special subframes
The Channel mapping relationship of TD-LTE is shown in fig. 3, taking a 5MHz bandwidth and a subframe configuration 1.2 antenna TD-LTE system as an example, where PBCH is placed on the middle 6 Resource Blocks (RBs), and a Physical Downlink Control Channel (PDCCH) is placed on the first N (N ≦ 3) Orthogonal Frequency Division Multiplexing (OFDM) symbols of each subframe.
In an FDD System such as a Global System for Mobile Communication (GSM) System, uplink and downlink work continuously transmit at different frequency points, for example, downlink work at f1, uplink work at f2, and the above-mentioned jammer also continuously transmits an interference signal at the downlink frequency point, which can achieve a deployment target, that is, only interfere with users in a target area, and other users in a cell can still normally communicate. For a TDD system (e.g., TD-LTE system), since both uplink and downlink work on the same frequency point (e.g., frequency point f 1), as shown in fig. 4, in an uplink timeslot, an uplink receiver of the base station 12 is turned on, and receives an uplink signal sent by the UE 13 on f 1; however, at this time, the jammer 11 still transmits the interfering signal at the frequency f1, and therefore, the uplink receiver and the uplink receiving performance of the base station are inevitably affected, thereby affecting the normal communication of all users in the whole cell.
In view of the problems described in the background art, an improved method for transmitting an interferer is proposed in the prior art, in which the interferer mutes the uplink subframe and transmits an interfering signal only in the downlink subframe, thereby avoiding uplink interference to the base station. However, in order to implement this method, after the interferer and the target TD-LTE system are synchronized, the current subframe direction, i.e. the uplink subframe or the downlink subframe, is determined according to the known uplink and downlink subframe ratio.
However, in the above scheme, the uplink and downlink subframe matching information is almost difficult to obtain in the specific implementation process, because the uplink and downlink subframe matching information is carried in the broadcast channel of the LTE, the information can be obtained only by demodulating the broadcast channel, but the demodulation function realized based on the general digital chip is generally complex and has high cost. In addition, the following difficulties also exist in the actual acquisition process of the uplink and downlink subframe ratio: in China, the TD-LTE system operates in multiple frequency bands, such as the F band (1885-1915 MHz), the E band (2320-2370 MHz), and the D band (2575-2615 MHz). In the actual network at present, the frame header positions (the starting position of a 10ms radio frame in time) of the TD-LTE system on multiple frequency bands may be aligned or may be different. This causes great difficulty to the synchronization procedure of the TD-LTE jammer, for the following reasons: synchronization of the TD-LTE jammer and the TD-LTE system can realize silence in an uplink phase so as to protect uplink reception of the base station. Considering clock drift of the crystal oscillator, the jammer needs to continuously track the downlink synchronization signal of the TD-LTE system in order to perform time domain and frequency domain deskewing. However, if the frame header of the TD-LTE system between multiple frequency bands is not synchronized, the synchronization tracking process for the jammer is difficult, because the jammer needs to scan back among the multiple frequency bands to simultaneously track the TD-LTE system on the multiple frequency bands.
Disclosure of Invention
In view of this, embodiments of the present invention provide a synchronization method and apparatus in an interferer, and an interferer, to solve at least one problem in the prior art, which can avoid affecting an uplink receiver and uplink receiving performance of a base station, so as not to affect normal communications of all users in a whole cell.
The technical scheme of the embodiment of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a synchronization method in an interferer, where the method includes:
tracking a synchronous signal on a reference frequency band to obtain the current frame head position of the reference frequency band;
determining the current frame head position of each frequency band according to the time difference between the frame head position of each frequency band and the frame head position of the reference frequency band of the communication system supported by the interference unit and the current frame head position of the reference frequency band;
acquiring a frame structure of each frequency band;
and sending a synchronous control signal according to the current frame head position and the corresponding frame structure of each frequency band, wherein the synchronous control signal is used for controlling a transmission link in the interference unit to transmit an interference signal.
In a second aspect, an embodiment of the present invention provides a synchronization apparatus in an interferer, the apparatus includes a tracking unit, a determining unit, an obtaining unit, and a sending unit, where:
the tracking unit is used for tracking a synchronous signal on a reference frequency band and acquiring the current frame head position of the reference frequency band;
the determining unit is configured to determine a current frame header position of each frequency band according to a time difference between a frame header position of each frequency band and a frame header position of a reference frequency band of a communication system supported by the interferer and the current frame header position of the reference frequency band;
the acquiring unit is used for acquiring a frame structure of each frequency band;
and the sending unit is used for sending a synchronous control signal according to the current frame head position of each frequency band and the corresponding frame structure, wherein the synchronous control signal is used for controlling a transmitting link in the interference unit to transmit an interference signal.
In a third aspect, an embodiment of the present invention provides an interferer, where the interferer includes a processor and a transmit chain, where
The processor is used for tracking a synchronous signal on the reference frequency band and obtaining the current frame head position of the reference frequency band; the interference unit is used for determining the position of a frame head of each frequency band according to the time difference between the position of the frame head of each frequency band and the position of the frame head of a reference frequency band of a communication system supported by the interference unit and the position of a current frame head of the reference frequency band; a frame structure for obtaining each frequency band; the synchronous control signal is used for controlling a transmitting link in the interference unit to transmit an interference signal;
and the transmitting link is used for transmitting an interference signal according to the synchronous control signal.
The embodiment of the invention provides a synchronization method and a synchronization device in an interference unit and the interference unit, wherein a synchronization signal on a reference frequency band is tracked to obtain the current frame header position of the reference frequency band; determining the current frame head position of each frequency band according to the time difference between the frame head position of each frequency band and the frame head position of the reference frequency band of the communication system supported by the interference unit and the current frame head position of the reference frequency band; acquiring a frame structure of each frequency band; sending a synchronous control signal according to the current frame head position and the corresponding frame structure of each frequency band, wherein the synchronous control signal is used for controlling a transmission link in the interference unit to transmit an interference signal; therefore, the influence on the uplink receiver and the uplink receiving performance of the base station can be avoided, and the normal communication of all users in the whole cell is not influenced.
Drawings
FIG. 1 is a diagram illustrating a network architecture of a TDD system according to the prior art;
fig. 2 is a diagram illustrating a frame structure in a TD-LTE system according to the related art;
fig. 3 is a schematic diagram of a channel mapping relationship of TD-LTE in the related art;
FIG. 4 is a diagram illustrating a network architecture of a TDD system according to the prior art;
fig. 5 is a schematic flow chart illustrating an implementation of a synchronization method in an interferer according to an embodiment of the present invention;
fig. 6 is a schematic flow chart illustrating an implementation of a synchronization method in a second jammer according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a synchronization apparatus in a three-jammer according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a synchronization apparatus in a four-jammer according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a synchronization apparatus in a five-jammer according to an embodiment of the present invention;
fig. 10-1 is a schematic diagram of a first exemplary structure of a five-jammer according to the present invention;
fig. 10-2 is a schematic diagram of a second exemplary structure of a five-way jammer according to the present invention;
fig. 10-3 is a schematic diagram of a structure of a five-jammer according to an embodiment of the present invention;
fig. 10-4 is a schematic diagram of a structure of a five-way jammer according to an embodiment of the present invention;
fig. 10-5 are schematic diagrams of the structure of a five-interference unit according to an embodiment of the present invention;
fig. 11 is a schematic flow chart illustrating an implementation of a synchronization method in an eleven jammer according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Example one
The embodiment of the present invention provides a synchronization method in an interferer, where the method is applied to the interferer, and the function implemented by the method may be implemented by a processor in the interferer calling a program code, where of course the program code may be stored in a computer storage medium, and thus the interferer at least includes a processor and a storage medium.
Fig. 5 is a schematic flow chart illustrating an implementation process of a synchronization method in an interferer according to an embodiment of the present invention, and as shown in fig. 5, the synchronization method in the interferer includes:
here, the reference frequency band is one or more frequency bands in the communication system supported by the jammer, and for convenience of implementation, in this embodiment and the following embodiments, the reference frequency band is taken as an example, it should be noted that, in the communication system, a base station needs to transmit a synchronization signal on the frequency band, and although some frequency bands are frequency bands supported by the communication system, the communication system does not operate by using the frequency band, and if the reference frequency band is set as a frequency band in which the communication system does not operate, locking the reference frequency band to track the synchronization signal on the reference frequency band cannot be achieved. In this embodiment and the following embodiments, the synchronization signal may be a downlink synchronization signal sent by the base station to the UE, and the interferer implements interference on the UE by searching for the downlink synchronization signal sent by the base station.
Here, the current frame header position of the reference frequency band refers to a frame header position of the current reference frequency band, wherein the frame header position is also referred to as a frame header signal position.
here, the time difference may be stored in advance, or may be determined or calculated in real time; it should be noted that the real-time determination or calculation will consume resources of the jammer comparatively, and therefore, after the jammer is powered on, the jammer will perform some steps to obtain the time difference and store the time difference in advance. As described in the background, the time difference is obtained because the positions of the frame headers in the multiple frequency bands of the communication system may be aligned or may be different. And the clock of the crystal oscillator in the disturber can drift, so that the current frame header position of each frequency band cannot be accurately obtained. It should be noted that, even if the crystal oscillator always drifts, the time difference between the frame header positions of the frequency bands is fixed, so to solve this problem, in each embodiment of the present invention, the current frame header position of each frequency band is obtained by locking the reference frequency band and calculating the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band in advance.
here, a person skilled in the art can acquire a frame structure on each frequency band according to various existing techniques.
The synchronization method in the jammer provided by the embodiment of the invention is suitable for a general communication system, especially suitable for a communication system with an overlapped frequency band of an uplink frequency band and a downlink frequency band.
In the embodiment of the invention, a synchronous signal on a reference frequency band is tracked to obtain the current frame head position of the reference frequency band; determining the current frame head position of each frequency band according to the time difference between the frame head position of each frequency band and the frame head position of the reference frequency band of the communication system supported by the interference unit and the current frame head position of the reference frequency band; acquiring a frame structure of each frequency band; sending a synchronous control signal according to the current frame head position and the corresponding frame structure of each frequency band, wherein the synchronous control signal is used for controlling a transmission link in the interference unit to transmit an interference signal; therefore, the technical scheme provided by the embodiment of the invention can enable the interference unit to be well adapted to and stably work in a scene with frame headers in a plurality of frequency bands not synchronous. As described above, if frame headers are not synchronized among a plurality of frequency bands, it is difficult to perform synchronous tracking processing on an interferer, and based on the technical solution of the present invention, the interferer can be stably locked on a certain frequency band to perform synchronous tracking, and the frame header position on each frequency band is calculated by measuring the time difference of the frame header positions on different stored frequency bands in advance, thereby solving the above problems, and further avoiding the influence on the uplink receiver and uplink receiving performance of the base station, so as not to affect the normal communication of all users in the whole cell.
Example two
Based on the first embodiment, the embodiment of the present invention provides a synchronization method in a jammer, where the method is applied to the jammer, and the functions implemented by the method may be implemented by a processor in the jammer calling a program code, where of course, the program code may be stored in a computer storage medium, and thus, the jammer at least includes the processor and the storage medium.
Fig. 6 is a schematic flow chart illustrating an implementation flow of a synchronization method in a second jammer according to an embodiment of the present invention, as shown in fig. 6, the synchronization method in the jammer includes:
601, after the interference unit is powered on, controlling a transmitting link of the interference unit to keep a closing state;
here, the jammer includes a transmission link for transmitting the interference signal in addition to the processor, and after the jammer is powered on, the processor controls the transmission link to be in a closed state, so that the transmission link cannot transmit the interference signal.
here, the reference frequency band may be preset, taking the TD-LTE system as an example, the frequency bands supported by the TD-LTE system include a D frequency band, an F frequency band, and an E frequency band, and a person skilled in the art may set any frequency band as the reference frequency band.
here, the time difference may be stored in advance, or may be determined or calculated in real time; it should be noted that the real-time determination or calculation will consume resources of the jammer comparatively, and therefore, after the jammer is powered on, the jammer will perform some steps to obtain the time difference and store the time difference in advance. As described in the background, the time difference is obtained because the positions of the frame headers in the multiple frequency bands of the communication system may be aligned or may be different. And the clock of the crystal oscillator in the disturber can drift, so that the current frame header position of each frequency band cannot be accurately obtained. It should be noted that, even if the crystal oscillator always drifts, the time difference between the frame header positions of the frequency bands is fixed, so to solve this problem, in each embodiment of the present invention, the current frame header position of each frequency band is obtained by locking the reference frequency band and calculating the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band in advance.
here, a person skilled in the art can acquire a frame structure on each frequency band according to various existing techniques.
There is provided a method for implementing step 602, specifically, step 602, the searching for a synchronization signal in each frequency band of the communication system, and recording a frame header position of each frequency band, including:
step 6021, searching frequency points on each frequency band one by one;
step 6022, when the synchronous signal is searched on the frequency point, recording the frame header position of the frequency point as the frame header position of the frequency band;
and 6023, stopping searching the synchronous signals on other frequency points in the frequency band when the synchronous signals are searched on the frequency points.
It should be noted that, besides the above-mentioned method for searching for the synchronization signal of each frequency band, those skilled in the art can implement step 602 by using various existing technologies, and details are not described here.
In the embodiment of the invention, when no synchronous signal is searched on all frequency points on the frequency band, a first search result is recorded, and the first search result is used for indicating that no synchronous signal is searched on the frequency band. The method of the embodiment of the invention also comprises the following steps: and according to the first search result, not sending a synchronous control signal on the frequency band.
EXAMPLE III
Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization apparatus in an interferer, where a tracking unit, a determining unit, an obtaining unit, and a sending unit in the apparatus may all be implemented by a processor in the interferer; of course, the implementation can also be realized through a specific logic circuit; in the course of a particular embodiment, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Fig. 7 is a schematic structural diagram of a synchronization apparatus in a three-jammer according to an embodiment of the present invention, and as shown in fig. 7, the apparatus 700 includes a tracking unit 701, a determining unit 702, an obtaining unit 703, and a sending unit 704, where:
the tracking unit 701 is configured to track a synchronization signal on a reference frequency band, and obtain a current frame header position of the reference frequency band;
the determining unit 702 is configured to determine a current frame header position of each frequency band according to a time difference between a frame header position of each frequency band and a frame header position of a reference frequency band of a communication system supported by the interferer and the current frame header position of the reference frequency band;
the acquiring unit 703 is configured to acquire a frame structure of each frequency band;
the sending unit 704 is configured to send a synchronization control signal according to the current frame header position and the corresponding frame structure of each frequency band, where the synchronization control signal is used to control a transmission link in the jammer to transmit an interference signal.
In the embodiment of the invention, a tracking unit 701 tracks a synchronous signal on a reference frequency band to obtain the current frame head position of the reference frequency band; the determining unit 702 determines the current frame header position of each frequency band according to the time difference between the frame header position of each frequency band and the frame header position of the reference frequency band of the communication system supported by the jammer and the current frame header position of the reference frequency band; the acquiring unit 703 acquires a frame structure of each frequency band; the sending unit 704 sends a synchronization control signal according to the current frame header position and the corresponding frame structure of each frequency band, where the synchronization control signal is used to control a transmission link in the jammer to transmit an interference signal; therefore, the technical scheme provided by the embodiment of the invention can enable the interference unit to be well adapted to and stably work in a scene with frame headers in a plurality of frequency bands not synchronous. As described above, if frame headers are not synchronized among a plurality of frequency bands, it is difficult to perform synchronous tracking processing on an interferer, and based on the technical solution of the present invention, the interferer can be stably locked on a certain frequency band to perform synchronous tracking, and the frame header position on each frequency band is calculated by measuring the time difference of the frame header positions on different stored frequency bands in advance, thereby solving the above problems, and further avoiding the influence on the uplink receiver and uplink receiving performance of the base station, so as not to affect the normal communication of all users in the whole cell.
Here, it should be noted that: the above description of the embodiment of the apparatus is similar to the above description of the embodiment of the method, and has similar beneficial effects to the embodiment of the method, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, please refer to the description of the embodiments of the method of the present invention for understanding, and therefore, for brevity, will not be described again.
Example four
Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization apparatus in an interferer, where the apparatus forms a unit, a tracking unit, a determining unit, an obtaining unit, and a sending unit, where each unit includes each module, and each sub-module included in each module may be implemented by a processor in the interferer; of course, the implementation can also be realized through a specific logic circuit; in the course of a particular embodiment, the processor may be a central processing unit, a microprocessor, a digital signal processor, a field programmable gate array, or the like.
Fig. 8 is a schematic diagram of a composition structure of a synchronization apparatus in a four-disturber according to an embodiment of the present invention, as shown in fig. 8, the apparatus 800 includes a forming unit 801, a tracking unit 802, a determining unit 803, an acquiring unit 804 and a sending unit 805, where the forming unit 801 further includes a control module 8011, a searching module 8012, an acquiring module 8013 and a determining module 8014, where:
the control module 8011 is configured to control a transmit link of the jammer to remain in a closed state;
the searching module 8012 is configured to search a synchronization signal on each frequency band of the communication system, and record a frame header position of each frequency band;
the acquiring module 8013 is configured to acquire a frame header position of a reference frequency band, where the reference frequency band is a frequency band supported by the communication system;
the determining module 8014 is configured to determine a time difference between a frame header position of the reference frequency band and a frame header position of each frequency band.
The tracking unit 802 is configured to track a synchronization signal on a reference frequency band, and obtain a current frame header position of the reference frequency band;
the determining unit 803 is configured to determine a current frame header position of each frequency band according to a time difference between the frame header position of each frequency band and the frame header position of a reference frequency band of the communication system supported by the interferer and the current frame header position of the reference frequency band;
the obtaining unit 804 is configured to obtain a frame structure of each frequency band;
the sending unit 805 is configured to send a synchronization control signal according to a current frame header position and a corresponding frame structure of each frequency band, where the synchronization control signal is used to control a transmission link in the jammer to transmit an interference signal.
Here, it should be noted that: the above description of the embodiment of the apparatus is similar to the above description of the embodiment of the method, and has similar beneficial effects to the embodiment of the method, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, please refer to the description of the embodiments of the method of the present invention for understanding, and therefore, for brevity, will not be described again.
EXAMPLE five
Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization apparatus in an interferer, where the apparatus forms a unit, a tracking unit, a determining unit, an obtaining unit, and a sending unit, where each unit includes each module, and each sub-module included in each module may be implemented by a processor in the interferer; of course, the implementation can also be realized through a specific logic circuit; in the course of a particular embodiment, the processor may be a central processing unit, a microprocessor, a digital signal processor, a field programmable gate array, or the like.
Fig. 9 is a schematic diagram of a composition structure of a synchronization apparatus in a four-disturber according to an embodiment of the present invention, as shown in fig. 9, the apparatus 800 includes a forming unit 801, a tracking unit 802, a determining unit 803, an acquiring unit 804, a sending unit 805, and a processing unit 806, where the forming unit 801 further includes a control module 8011, a search module 8012, an acquiring module 8013, and a determining module 8014, where the search module 8012 includes a search sub-module 8121, a first recording sub-module 8122, a stop sub-module 8123, and a second recording sub-module 8124, where:
the control module 8011 is configured to control a transmit link of the jammer to remain in a closed state;
the searching submodule 8121 is configured to search frequency points on each frequency band one by one;
the recording sub-module 8122 is configured to record a frame header position of the frequency point as a frame header position of the frequency band when the synchronization signal is searched for on the frequency point.
The stopping sub-module 8123 is configured to stop searching for the synchronization signals on other frequency points on the frequency band when the synchronization signals are searched on the frequency point.
The second recording sub-module 8124 is configured to record a first search result when no synchronization signal is searched on all frequency points on the frequency band, where the first search result is used to indicate that no synchronization signal is searched on the frequency band.
The acquiring module 8013 is configured to acquire a frame header position of a reference frequency band, where the reference frequency band is a frequency band supported by the communication system;
the determining module 8014 is configured to determine a time difference between a frame header position of the reference frequency band and a frame header position of each frequency band.
The tracking unit 802 is configured to track a synchronization signal on a reference frequency band, and obtain a current frame header position of the reference frequency band;
the determining unit 803 is configured to determine a current frame header position of each frequency band according to a time difference between the frame header position of each frequency band and the frame header position of a reference frequency band of the communication system supported by the interferer and the current frame header position of the reference frequency band;
the obtaining unit 804 is configured to obtain a frame structure of each frequency band;
the sending unit 805 is configured to send a synchronization control signal according to a current frame header position and a corresponding frame structure of each frequency band, where the synchronization control signal is used to control a transmission link in the jammer to transmit an interference signal.
The processing unit 806 is configured to not send a synchronization control signal on the frequency band according to the first search result.
Here, it should be noted that: the above description of the embodiment of the apparatus is similar to the above description of the embodiment of the method, and has similar beneficial effects to the embodiment of the method, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, please refer to the description of the embodiments of the method of the present invention for understanding, and therefore, for brevity, will not be described again.
EXAMPLE six
Based on the foregoing embodiments, another interference unit is provided in the embodiments of the present invention, fig. 10-1 is a schematic structural diagram of a tenth interference unit in the embodiments of the present invention, as shown in fig. 10-1, the interference unit 1000 includes a processor 1001 and a transmission link 1002, where
The processor 1001 is configured to track a synchronization signal on the reference frequency band, and obtain a current frame header position of the reference frequency band; the interference unit is used for determining the position of a frame head of each frequency band according to the time difference between the position of the frame head of each frequency band and the position of the frame head of a reference frequency band of a communication system supported by the interference unit and the position of a current frame head of the reference frequency band; a frame structure for obtaining each frequency band; the synchronous control signal is used for controlling a transmitting link in the interference unit to transmit an interference signal;
the transmitting link 1002 is configured to transmit an interference signal according to the synchronization control signal.
In the embodiment of the present invention, as shown in fig. 10-2, the jammer further includes a first antenna 1003 for transmitting an interference signal and searching for a synchronization signal.
In this embodiment of the present invention, as shown in fig. 10-3, the jammer further includes a second antenna 1004 and a third antenna 1005, where:
the second antenna is used for searching a synchronous signal;
the third antenna is used for transmitting interference signals.
Here, it should be noted that: the above description of the embodiment of the jammer is similar to the above description of the method, and has the same beneficial effects as the embodiment of the method, and therefore, the description thereof is omitted. For technical details not disclosed in the embodiment of the jammer of the present invention, those skilled in the art should refer to the description of the embodiment of the method of the present invention to understand that, for the sake of brevity, detailed description is not repeated here.
It should be noted that in the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiment is only illustrative, for example, the division of the unit is only one logical function division, and there may be another division manner in actual implementation, for example, the structure of the jammer shown in fig. 10-1 may also adopt the structure shown in fig. 10-4 and 10-5, and the jammer mainly consists of an antenna, a transmission link, and a synchronization control unit, where the synchronization control unit may be combined with the transmission link through a combiner, so as to share the antenna (see fig. 10-4), or may not share the antenna (see fig. 10-5), where the combiner may be implemented by various existing technologies, and the synchronization control unit may be implemented based on an entity hardware processor in the process of specific implementation.
EXAMPLE eleven
Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization method in an interferer. In the embodiment of the present invention, a TD-LTE system is taken as an example to describe a technical solution of the embodiment of the present invention, and fig. 11 is a schematic diagram of an implementation flow of a synchronization method in an eleven jammer according to the embodiment of the present invention, as shown in fig. 11, the method includes:
here, after power-on, the search is not started yet by the jammer, and therefore, the search is started by acquiring the first frequency band from the supported frequency bands. Specifically, the transmission link in the jammer remains in the off state, and the synchronization control unit searches the synchronization signals of all TD-LTE frequency points on the first frequency band starting from the supported first frequency band.
specifically, whether the synchronization information is searched on any frequency point on the frequency band is judged, if yes, the step 1104 is performed, and if not, the step 1105 is performed;
specifically, step 1102 obtains the next frequency band, starts to search all frequency points on the frequency band, and then step 1103 is executed, and the process is repeated until all frequency bands are searched.
and 1109, correspondingly adjusting the positions of the frame headers on other frequency bands according to the position of the frame header of the reference frequency band and the time difference of the frame header calculated in advance.
Example twelve
Based on the foregoing embodiments, an embodiment of the present invention provides a synchronization method in an interferer. In the embodiment of the present invention, a TD-LTE system will be taken as an example to describe the technical solution of the embodiment of the present invention, and the method includes:
step S1101, when power is on initially, a transmitting link in the jammer keeps a closed state, and the synchronous control unit starts to scan and search TD-LTE system synchronous signals on all frequency points of all TD-LTE system frequency bands supported by the jammer in sequence; then, the process proceeds to step S1102.
Here, in the process of scanning all frequency points on the frequency band of the TD-LTE system, two schemes may be adopted, wherein the first scheme is to adopt a behavior similar to that of a terminal and perform scanning detection at an interval of 100 KHz; the second scheme is that, considering that the existing network generally only works on several fixed frequency points, the search can be performed on several fixed frequency points on each frequency band according to the actual system configuration of the existing network, so as to speed up the scanning process.
Step S1102, judging whether the TD-LTE system has other frequency bands which are not searched, if yes, entering step S1103, and if not, entering step S1106;
step S1103, searching for TD-LTE system synchronization signals on all frequency points on a certain frequency band; for a frequency band, if a synchronization signal is searched for at a certain frequency point of the frequency band, step S1104 is performed; if no synchronization signal is detected after the search of all frequency points of the frequency band is completed, step S1105 is entered.
Step S1104, the synchronous control unit records the frame header position of the frequency band;
for example, the frame header position of the first frequency band is denoted as S1. Note that even though TD-LTE synchronization signals are searched for on multiple frequency points of this frequency band, since the TD-LTE system on multiple frequency points of the same frequency band must require frame header alignment synchronization, there is only one frame header position for one frequency band. Then, for other frequency points on the frequency band, whether to continue searching can be determined according to the interference working principle of the interference device:
when the jammer works in the fixed broadband interference mode, such as when a 60MHz broadband interference signal is fixedly transmitted in the D band, or a single tone scanning signal is transmitted in the bandwidth of 60MHz, the process directly enters step S1102 to start searching the next band without searching other frequency points.
When the jammer works in the interference mode with variable bandwidth, for example, the jammer supports transmitting 20MHz interference signals, an optimization scheme is that all frequency points can be searched continuously, and the search result on each frequency point is recorded to be used as the subsequent interference signal transmission, and the synchronous control unit can control the jammer to transmit the interference signals only on the corresponding frequency point of the TD-LTE system according to the search result on each frequency point. For example, for the D band, if the synchronization control unit searches for the TD-LTE signal only at the frequency point of 2585MHz, the synchronization control unit may control the jammer to select to send the interfering signal with the bandwidth of 20MHz only at the central frequency point of 2585 MHz. Then, the process proceeds to step S1102, and a search for a next frequency band is started.
In step S1105, if no TD-LTE synchronization signal is searched for on all frequency points of the frequency band, the synchronization control unit records the search result of the frequency band for subsequent processing. Then, step S1102 is entered to start searching for the next frequency band.
If no TD-LTE signal exists in the frequency band, the synchronous control unit can control the interference unit to keep silent on the frequency band and not transmit the interference signal when the subsequent interference unit transmits the interference signal; or the synchronous control unit can also select to control the interference unit to transmit interference signals after determining the frame head position and the TD-LTE frame structure on the frequency band according to the preset default parameters.
Step S1106, the synchronization control unit calculates and stores the time difference between the frame header positions of all other frequency bands relative to the frame header position of the given frequency band by using the frame header position of a given frequency band as a reference according to the frame header positions recorded on all the frequency bands of the TD-LTE system.
For example, if TD-LTE positions are searched in the F, E, D frequency bands, the frame header positions are S1, S2, and S3, respectively, and assuming that the frame header position of the D frequency band is used as a reference, the relative time difference (abbreviated as time difference) between the frame header positions of different frequency bands is calculated and stored, for example, the time difference Offset1 from the frame header position of the D frequency band is S1-S3, and the time difference Offset2 from the frame header position of the D frequency band is S2-S3. After that, the process proceeds to step S1107.
Step S1107, the synchronization control unit locks a certain frequency point of the reference frequency band, which is searched to the TD-LTE system, continuously tracks and detects a synchronization signal, and performs time domain and frequency domain correction to obtain the current frame head position of the reference frequency band;
step S1108, calculating the current frame head position on each frequency band according to the current frame head position of the reference frequency band and the time difference determined in step S1106;
step S1109, when the jammer prepares to interfere the TD-LTE system on the reference frequency band, determining the frame header position of the TD-LTE system according to the synchronous control signal output by the synchronous control unit, and starting to send the interference signal according to the determined TD-LTE frame structure;
when the jammer is ready to interfere with the TD-LTE system on another frequency band, the synchronization control unit may still lock on the reference frequency band, continuously output the synchronization control signal, and determine the frame header position of the TD-LTE system on the frequency band based on the calculation according to the relative time difference of the frame header positions between different frequency bands stored in step S1106, considering that the relative time difference is generally fixed, and start to transmit the interference signal according to the determined TD-LTE frame structure.
It should be emphasized that, before step S1109, the jammer should be in the silent state and not transmit the interference signal. In addition, when the synchronization control module is not synchronized or out of synchronization, the interference signal transmission link of the jammer should also be kept in a closed state.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (16)
1. A method of synchronization in a jammer, the method comprising:
tracking a synchronous signal on a reference frequency band to obtain the current frame head position of the reference frequency band; the reference frequency band is used for determining the synchronous signal so that an interference unit generates an interference signal based on the synchronous signal;
determining the current frame head position of each frequency band according to the time difference between the frame head position of each frequency band and the frame head position of the reference frequency band of the communication system supported by the interference unit and the current frame head position of the reference frequency band;
acquiring a frame structure of each frequency band;
and sending a synchronous control signal according to the current frame head position and the corresponding frame structure of each frequency band, wherein the synchronous control signal is used for controlling a transmitting link in the interference unit to transmit the interference signal.
2. The method of claim 1, wherein an uplink frequency band of the communication system and a downlink frequency band of the communication system have overlapping frequency bands.
3. The method of claim 2, wherein the communication system is a time division long term evolution (TD-LTE) communication system.
4. The method of claim 1, wherein the time difference is obtained by:
controlling a transmission link of the jammer to remain in a closed state;
searching a synchronous signal on each frequency band of the communication system, and recording a frame header position of each frequency band;
acquiring a frame header position of a reference frequency band, wherein the reference frequency band is a frequency band supported by the communication system;
and determining the time difference between the frame header position of the reference frequency band and the frame header position of each frequency band.
5. The method of claim 4, wherein the searching for the synchronization signal in each frequency band of the communication system and recording the frame header position of each frequency band comprises:
searching the frequency points on each frequency band one by one;
and when the synchronous signal is searched on the frequency point, recording the frame header position of the frequency point as the frame header position of the frequency band.
6. The method of claim 5, wherein the searching for the synchronization signal in each frequency band of the communication system and recording a frame header position of each frequency band further comprises:
and when the synchronous signals are searched on the frequency point, stopping searching the synchronous signals on other frequency points on the frequency band.
7. The method of claim 6, wherein the searching for the synchronization signal in each frequency band of the communication system and recording a frame header position of each frequency band further comprises:
and when no synchronous signal is searched on all frequency points on the frequency band, recording a first search result, wherein the first search result is used for indicating that no synchronous signal is searched on the frequency band.
8. The method of claim 7, further comprising:
and according to the first search result, not sending a synchronous control signal on the frequency band.
9. A synchronization apparatus in a jammer, the apparatus comprising a tracking unit, a determining unit, an acquiring unit, and a transmitting unit, wherein:
the tracking unit is used for tracking a synchronous signal on a reference frequency band and acquiring the current frame head position of the reference frequency band; the reference frequency band is used for determining the synchronous signal so that an interference unit generates an interference signal based on the synchronous signal;
the determining unit is configured to determine a current frame header position of each frequency band according to a time difference between a frame header position of each frequency band and a frame header position of a reference frequency band of a communication system supported by the interferer and the current frame header position of the reference frequency band;
the acquiring unit is used for acquiring a frame structure of each frequency band;
and the sending unit is used for sending a synchronous control signal according to the current frame head position of each frequency band and the corresponding frame structure, wherein the synchronous control signal is used for controlling a transmitting link in the interference unit to transmit the interference signal.
10. The apparatus of claim 9, further comprising: a forming unit, the forming unit further comprising a control module, a search module, an acquisition module, and a determination module, wherein:
the control module is used for controlling a transmitting link of the interference unit to keep a closing state;
the searching module is used for searching a synchronous signal on each frequency band of the communication system and recording the frame header position of each frequency band;
the acquiring module is configured to acquire a frame header position of a reference frequency band, where the reference frequency band is a frequency band supported by the communication system;
and the determining module is used for determining the time difference between the frame header position of the reference frequency band and the frame header position of each frequency band.
11. The apparatus of claim 10, wherein the search module comprises a search sub-module and a first record sub-module, wherein:
the searching submodule is used for searching the frequency points on each frequency band one by one;
and the recording submodule is used for recording the frame header position of the frequency point as the frame header position of the frequency band when the synchronous signal is searched on the frequency point.
12. The apparatus of claim 11, wherein the search module further comprises a stop sub-module and a second record sub-module, wherein:
the stopping submodule is used for stopping searching the synchronous signals on other frequency points on the frequency band when the synchronous signals are searched on the frequency points;
and the second recording submodule is used for recording a first search result when the synchronous signals are not searched on all frequency points on the frequency band, and the first search result is used for indicating that the synchronous signals are not searched on the frequency band.
13. The apparatus of claim 12, further comprising a processing unit configured to not transmit a synchronization control signal on the frequency band according to the first search result.
14. An interferer comprising a processor and a transmit chain, wherein
The processor is used for tracking a synchronous signal on a reference frequency band and acquiring the current frame head position of the reference frequency band; the reference frequency band is used for determining the synchronous signal so that an interference unit generates an interference signal based on the synchronous signal; the interference unit is used for determining the position of a frame head of each frequency band according to the time difference between the position of the frame head of each frequency band and the position of the frame head of a reference frequency band of a communication system supported by the interference unit and the position of a current frame head of the reference frequency band; a frame structure for obtaining each frequency band; the synchronous control signal is used for controlling a transmitting link in the interference unit to transmit the interference signal;
and the transmitting link is used for transmitting the interference signal according to the synchronous control signal.
15. The jammer of claim 14, further comprising a first antenna for transmitting the interfering signal and searching for the synchronization signal.
16. The jammer of claim 14, further comprising a second antenna and a third antenna, wherein:
the second antenna is used for searching a synchronous signal;
the third antenna is used for transmitting interference signals.
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