CN110708755B

CN110708755B - Synchronous time sequence shielding method and shielding system

Info

Publication number: CN110708755B
Application number: CN201910925352.0A
Authority: CN
Inventors: 曹永福; 张宏亮; 林晓君
Original assignee: Zhejiang Sunwave Communications Technology Co Ltd
Current assignee: Zhejiang Sunwave Communications Technology Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-11-09
Anticipated expiration: 2039-09-27
Also published as: CN110708755A; WO2021057028A1

Abstract

The invention relates to a shielding method and a shielding system of synchronous time sequence, which are characterized in that an identification frame and a synchronous time sequence position for carrying out synchronous time sequence are obtained from frame signals sent by synchronous reference equipment in different frame periods, the time sequence synchronization of the equipment to be synchronously shielded and the synchronous reference equipment is obtained according to the identification frame and the synchronous time sequence position, and then a base station frame is stored in the stored time sequence position and periodically forwarded to carry out shielding work. According to the shielding method and the shielding system, the equipment in the system is selected as the synchronous reference equipment, so that no external signal is introduced, the material cost and the maintenance cost for additionally installing the external equipment can be saved, and the cost is reduced; meanwhile, the identification frame and the synchronous time sequence position sent by the synchronous reference equipment are acquired, so that the synchronous equipment to be shielded can quickly and efficiently acquire time sequence synchronization, the synchronous time is shortened, the shielding work is accelerated to start, and the current progress of the base station can be judged at any time according to the identification frame and the synchronous time sequence position.

Description

Synchronous time sequence shielding method and shielding system

Technical Field

The present invention relates to the field of wireless mobile communications technologies, and in particular, to a method and a system for shielding a synchronous timing sequence.

Background

Currently, a communication network, especially a mobile phone communication network, brings great convenience to users and also creates hidden danger of information security, so that it is necessary to shield communication signals in some specific situations. When the range of the shielding area is large, a plurality of shielding devices are needed to achieve a better shielding effect. When a plurality of shielding devices are cooperatively shielded, time sequence synchronization is needed, otherwise, shielding frames of other shielding devices are received in the shielding process, and system chaos and shielding failure are caused.

To achieve timing synchronization, wireless communication networks typically employ signals external to the system for synchronization, such as GPS for timing synchronization. However, this solution requires additional installation of a receiving antenna, and has high failure rate and difficult maintenance, so that the engineering cost is greatly increased.

Disclosure of Invention

Accordingly, there is a need for a method and system for masking synchronous timing that can synchronize the timing of the system and reduce the engineering cost.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

a shielding method of synchronous time sequence is applied to a shielding system, the shielding system comprises a base station and a plurality of shielding devices, at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices does not acquire time sequence synchronization with the synchronous reference device; the shielding method comprises the following steps:

receiving an air signal in a shielding area, and acquiring frame signals sent by the synchronous reference equipment in a plurality of different frame periods;

acquiring an identification frame used for carrying out synchronous time sequence in a plurality of frame signals and a synchronous time sequence position corresponding to the identification frame;

acquiring time sequence synchronization with the synchronous reference equipment according to the identification frame and the synchronous time sequence position;

storing the radio frequency signals of the base station frame at a storage time sequence position of a preset storage and forwarding period, and periodically forwarding the radio frequency signals at a forwarding time sequence position of the storage and forwarding period to shield the radio frequency signals.

A shielding system for synchronizing time sequence comprises a base station and a plurality of shielding devices, wherein at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices is not synchronized with the synchronous reference device in time sequence; the shielding apparatus includes:

the first acquisition module is configured to receive an air signal in a shielded area and acquire frame signals sent by the synchronous reference device in a plurality of different frame periods;

the second acquisition module is connected with the first acquisition module and is set to acquire identification frames used for carrying out synchronous time sequence in the frame signals and synchronous time sequence positions corresponding to the identification frames;

the time sequence synchronization module is connected with the second acquisition module and is set to acquire time sequence synchronization with the synchronous reference equipment according to the identification frame and the synchronous time sequence position;

and the storage and forwarding module is connected with the first acquisition module and the time sequence synchronization module and is configured to store the radio frequency signals of the base station frame at the storage time sequence position and periodically forward the radio frequency signals at the forwarding time sequence position of the storage and forwarding period so as to perform shielding work.

According to the shielding method and the shielding system, the identification frame and the synchronous time sequence position for carrying out synchronous time sequence are obtained from the frame signals sent by the synchronous reference equipment in different frame periods, the time sequence synchronization of the equipment to be shielded and the synchronous reference equipment is obtained according to the identification frame and the synchronous time sequence position, and then the base station frame is stored in the stored time sequence position and periodically forwarded to carry out shielding work. According to the shielding method and the shielding system, the equipment in the system is selected as the synchronous reference equipment, so that no external signal is introduced, the material cost and the maintenance cost for additionally installing the external equipment can be saved, and the cost is reduced; meanwhile, the identification frame and the synchronous time sequence position sent by the synchronous reference equipment are acquired, so that the synchronous equipment to be shielded can quickly and efficiently acquire time sequence synchronization, the synchronous time is shortened, the shielding work is accelerated to start, and the current progress of the base station can be judged at any time according to the identification frame and the synchronous time sequence position.

Drawings

FIG. 1 is a flow diagram of a masking method of synchronous timing in one embodiment;

FIG. 2 is a flowchart corresponding to step S200 of FIG. 1 in one embodiment;

FIG. 3 is a flowchart corresponding to step S200 of FIG. 1 in one embodiment;

FIG. 4 is a flowchart corresponding to step S300 of FIG. 1 in one embodiment;

FIG. 5 is a flow chart of a masking method of synchronous timing in another embodiment;

FIG. 6 is a diagram illustrating store-and-forward rules, according to an embodiment;

FIG. 7 is a diagram illustrating store-and-forward rules, in an embodiment;

FIG. 8 is a diagram illustrating store-and-forward rules, in accordance with an embodiment;

FIG. 9 is a diagram illustrating store-and-forward rules, in accordance with an embodiment;

FIG. 10 is a block diagram of a masking device that performs the masking method of FIG. 1 in one embodiment;

FIG. 11 is a block diagram of a second acquisition module that performs step S200 of FIG. 2 in one embodiment;

FIG. 12 is a block diagram of a second obtaining module that performs step S200 in FIG. 3 according to an embodiment;

FIG. 13 is a block diagram of an embodiment of a timing synchronization module that performs step S300 in FIG. 4;

FIG. 14 is a block diagram of a masking device that performs the masking method of FIG. 5 in one embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Alternative embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, fig. 1 is a flow chart of a masking method of synchronous timing in an embodiment.

In this embodiment, the method for shielding a synchronous timing sequence is applied to a shielding system, where the shielding system includes a base station and a plurality of shielding devices, at least one of the base station and the plurality of shielding devices is a synchronization reference device, and at least one of the plurality of shielding devices does not acquire timing synchronization with the synchronization reference device (defined as a shielding device to be synchronized).

In this embodiment, the shielding device employs a base station frame storage and periodic forwarding type shielding, where periodically forwarded signals (defined as shielding frames) are identical to original downlink base station signals (defined as base station frames) of a base station, and for communication terminals such as mobile phones and the like, the signals are downlink base station frames, and the mobile phone cannot distinguish whether frame signals are base station frames or shielding frames, and when the signal strength of a shielding frame is greater than the original signal strength sent by the base station, decoding fails and network connection is lost, thereby achieving the purpose of effective shielding. When the shielding equipment performs shielding work, the shielding equipment needs to be synchronous with the base station time sequence so as to realize the time sequence alignment of the shielding frame and the base station frame; when the time sequence of a plurality of shielding devices is synchronous and the shielding work is carried out, the plurality of shielding devices are synchronous with the time sequence of the base station at the same time.

In the present embodiment, the masking method includes step S100, step S200, step S300, and step S400. The details are as follows:

step S100, receiving an air signal in the shielded area, and acquiring frame signals sent by the synchronous reference device in a plurality of different frame periods.

The synchronization reference device may be a base station, or may be a synchronization mask device (a mask device that has acquired timing synchronization). Optionally, when none of the shielding devices in the shielding system is time sequence synchronized, the synchronization reference device is a base station; optionally, when there is at least one synchronization masking device in the masking system, the synchronization reference device may be a synchronization masking device and/or a base station. By selecting the equipment in the system as the synchronous reference equipment, no external signal is introduced, so that the material cost and the maintenance cost for additionally installing the external equipment can be saved, and the cost is reduced.

The shielding area refers to an area which can be covered by shielding frames of all shielding devices; the air signal refers to a signal which can be received by the shielding device to be synchronized, and comprises a base station frame and/or a shielding frame. When a plurality of shielding devices in the shielding system are not time sequence synchronized, the aerial signal is a base station frame; when at least one synchronous shielding device is arranged in the shielding system, the air signal comprises a base station frame and a shielding frame. In order to realize the shielding purpose, the frame frequency of the shielding frame is the same as that of the base station, the modulation mode is the same, the time sequence is aligned, and the shielding frame is periodically forwarded, so the frame number change rule of a plurality of continuous shielding frames is different from the frame number change rule of a plurality of continuous base station frames; and the signal strength of the shielding frame in the same frame period is greater than that of the base station frame.

Alternatively, step S100 may quickly acquire frame signals of the same signal strength level through comparison of the signal strength values, and ensure that the frame signals originate from a synchronous reference device or from multiple synchronous reference devices at the same distance from the shielding device to be synchronized. The same signal intensity level refers to that the frame signals have the same intensity or are in the same numerical range, and the frame signals of the same signal intensity level originate from the same device or from a plurality of devices at the same distance from the shielding device to be synchronized. Optionally, step S100 is specifically: and receiving the aerial signals in the shielding region, decoding to obtain the signal strength value of the aerial signals, and obtaining the frame signals corresponding to the strongest signal strength value in each frame period.

Step S200, acquiring an identification frame for performing synchronization timing in the plurality of frame signals and a synchronization timing position corresponding to the identification frame.

In this embodiment, the identification frame is defined as an identification signal used for performing synchronization timing between the shielding device to be synchronized and the synchronization reference device; when the identification signal is detected, the shielding device to be synchronized and the synchronous reference device carry out synchronous timing sequence; the synchronous time sequence position is defined as a corresponding time point or time period of the identification frame in the whole frame sequence number cycle frame period process, and the shielding device to be synchronized and the synchronous reference device are synchronized at the time point or time period. For example, if the frame signals of the entire loop frame period are the 0 th frame, the 1 st frame, the 2 nd frame, and the … … rd 1023 th frame, respectively, the period length of the entire loop frame period is 10240 milliseconds (ms), the period length of each frame period is 10ms, and assuming that the identification frame is the 0 th frame, the synchronization timing position corresponding to the 0 th frame is a time period from the start time to the 10 th ms. Specifically, the number of frames is identified to be at least one.

The settings for the identification frames may be the same or different for different synchronous reference devices. Optionally, when the frame signal is a base station frame, a base station frame corresponding to a certain frame number may be arbitrarily set as an identification frame, for example, a base station frame with a frame number of frame 1, 129, 259 is set as an identification frame; optionally, when the frame signal is a mask frame, a special frame in the mask frame may be arbitrarily defined as an identification frame according to a store-and-forward rule, for example, a hopping frame is set as the identification frame; optionally, the identification frame of the base station frame and the hopping frame in the shielding frame are combined according to a store-and-forward rule, in the same store-and-forward period, the identification frame of the base station frame and the hopping frame in the shielding frame are frame signals with the same frame number and adjacent time sequence positions, the shielding device to be synchronized receives the base station frame first and then receives the hopping frame in the shielding frame, and at this time, the frame signal which hops for the first time in the system is actually the base station frame.

Optionally, referring to fig. 2 for assistance, step S200 includes step S201, step S202, step S203, and step S204.

In step S201, if the frame number change rule of the plurality of frame signals matches the signal transmission rule of the base station, it is determined that the frame signals are base station frames. Alternatively, the frame number change rule of the base station is that the frame number is continuously and incrementally changed with time, for example, the frame numbers of a plurality of consecutive base station frames are 0 th, 1 st, 2 nd and 3 rd 3 … … respectively with time change in a period of time. Therefore, the type of the frame signal can be judged quickly through the judgment of the frame number change rule.

Step S202, segmenting the time sequence position corresponding to a plurality of base station frames. For identification, step S202 segments the timing positions corresponding to a plurality of base station frames, so that the timing position of the identification frame can be set in each segment. The time lengths of the segments of the plurality of time sequence positions in different time periods can be the same or different, as long as the synchronous time sequence positions corresponding to the identification frames have regularity. Further, step S202 may be divided into time periods of the same duration. For example, in step S202, the timing positions corresponding to the base station frames may be segmented according to the radio frequency band of the base station, for example, when a plurality of base station frames output by the base station are respectively the 0 th frame, the 1 st frame, the 2 nd frame, … …, and the 1024 th frame, the timing positions corresponding to the plurality of base station frames are divided into 8 segments, and the timings of the frame signals in the 8 segments are sequentially the 0 th timing, the 1 st timing, … …, the 127 th timing, the 128 th timing, the 129 th timing, … …, the 255 th timing, and … ….

Step S203, setting the base station frame corresponding to the preset time sequence position in each segment as an identification frame for performing time sequence synchronization. After the segmentation in step S202, the base station frame corresponding to a preset time sequence position in each segment can be set arbitrarily as the identification frame. In order to facilitate the search of the position of the identification frame and improve the acquisition efficiency, optionally, step S203 sets the base station frame corresponding to the first time sequence position in each segment as the identification frame.

Step S204, acquiring a synchronous time sequence position corresponding to the identification frame. Specifically, in step S204, the corresponding frame number can be obtained by decoding each identification frame, so as to obtain the synchronization timing position corresponding to each identification frame according to the frame number.

Optionally, referring to fig. 3 for assistance, step S200 includes step S205, step S206, and step S207.

In step S205, if the frame number change rule of the plurality of frame signals matches the store-and-forward rule, the frame signal is determined to be a mask frame. Optionally, the frame sequence number change rule of the store-and-forward period is that the frame sequence number changes in a segmented manner over time and does not change in the same time period, for example, the frame sequence numbers of a plurality of consecutive mask frames are respectively 0 th, … … th 128 th, … … th, 256 th, … … over time. In the store-and-forward rule, the frame numbers of a plurality of continuous mask frames in the same time period are not changed, but the same frame signal is forwarded for a plurality of times, so that the number of the plurality of frame signals with the frame numbers unchanged in the same time period needs to be matched with the forwarding times correspondingly. Therefore, the type of the frame signal can be judged quickly through the judgment of the frame number change rule.

Step S206, the jump frame in the mask frame is set as the identification frame for timing synchronization. Due to the periodic forwarding characteristic of the mask frame, the frame number of the mask frame in the same time period is unchanged, the frame number of the adjacent time period jumps, and when the frame number jumps, the frame number can be detected quickly and efficiently, so that the jump frame can be set as the identification frame.

Step S207, a synchronization timing position corresponding to the hopping frame is obtained. Specifically, step S207 may obtain the synchronization timing position corresponding to the identification frame by decoding the identification frame.

Optionally, if, in the obtained multiple frame signals, the frame number change rule of the partial frame signal matches with the signal sending rule of the base station, and the frame number change rule of the partial frame signal matches with the store-and-forward rule, it is determined that the frame signal includes a base station frame and a mask frame. At this time, in the same store-and-forward period, the identification frame of the base station frame and the hopping frame in the shielding frame are frame signals with the same frame number and adjacent time sequence positions, the shielding device to be synchronized receives the base station frame first and then receives the hopping frame in the shielding frame, the frame signal which hops for the first time in the system is actually the base station frame, step S200 can directly set the frame signal which hops for the first time in the frame signal as the identification frame for performing time sequence synchronization, and the synchronization time sequence position corresponding to the identification frame is obtained; alternatively, step S200 may also set the identification frame and obtain the synchronization timing position corresponding to the identification frame according to the embodiment of fig. 2 or fig. 3.

Optionally, in the above optional manner, if the frame number change rule obtained by decoding the frame signal in the preset time in step S200 fails to match the frame number change rule of the base station or the frame number change rule of the store-and-forward cycle, an alarm is output, and the process returns to step S100.

Therefore, by the above optional manner, the step S200 can achieve the acquisition of the identification frame and the synchronization timing position, and by acquiring the identification frame and the synchronization timing position sent by the synchronization reference device, the synchronization device to be shielded in the subsequent steps can quickly and efficiently obtain timing synchronization, reduce synchronization time and accelerate the start of shielding work, and can also judge the current progress of the base station at any time according to the identification frame and the synchronization timing position: in the frame signals received by the synchronization equipment to be shielded, if the hopping frame is a shielding frame, the previous frame signal of the hopping frame is the base station frame, so that the timing position of the base station frame can be judged according to the synchronization timing position corresponding to the hopping frame. Furthermore, the synchronous time sequence can be corrected according to the judged current progress of the base station.

And step S300, acquiring the time sequence synchronization with the synchronous reference device according to the identification frame and the synchronous time sequence position.

Optionally, referring to fig. 4, step S300 includes: step S301, if the identification frame is a base station frame, aligning the storage time sequence position of the preset storage forwarding period with the synchronous time sequence position clock, and obtaining the time sequence synchronization with the synchronous reference equipment. At this time, the device to be synchronized in the system obtains timing synchronization with the base station at the stored timing position.

Optionally, referring to fig. 4, step S300 includes: step S302, if the identification frame is a shielding frame, aligning the forwarding time sequence position of the preset store-and-forward period with the synchronous time sequence position clock, and obtaining the time sequence synchronization with the synchronous reference device. At this time, the device to be synchronized in the system obtains timing synchronization with the synchronization shielding device at the forwarding timing position.

In this embodiment, the storage timing position is defined as a corresponding time point or time period when the shielding device stores the base station frame in the process of storing and periodically forwarding the base station frame, for example, the synchronous shielding device is set to store the 1 st frame transmitted by the base station in the time period of 10ms to 20 ms. Aligning the storage time sequence position with the synchronous time sequence position clock, which means that the time point or the time period of the storage base station frame is the same as the time point or the time period of the base station transmitting the identification frame; the clock alignment of the forwarding time sequence position and the synchronous time sequence position means that the preset time point or time period for the shielding device to be synchronized to forward the frame signal for the first time is the same as the time point or time period for the shielding device to forward the shielding frame for the first time. For example, when the identification frame is a base station frame, if the identification frame is a 1 st frame and the synchronization timing position is a time period of 10ms to 20ms, the shielding device starts receiving the 1 st frame at the time of 10ms and stops receiving at the time of 20 ms. The masking device obtains timing synchronization with the synchronous reference device when the memory timing location is clock aligned with the synchronous timing location.

Optionally, after step S300, if the masking system includes at least two synchronous masking devices, the authenticity of the timing synchronization with the synchronous reference device may also be determined. For example, a first base station frame stored by a plurality of synchronous shielding devices at the same storage time sequence position is obtained; and if the frame sequence numbers of the plurality of first base station frames correspond to one another, judging that the time sequence synchronization with the synchronous reference equipment is true.

Step S400, storing the radio frequency signal of the identification frame at the storage time sequence position, and periodically forwarding the radio frequency signal at the forwarding time sequence position of the storage forwarding period to perform shielding work.

The storage time sequence position can be set at the initial position of each storage and forwarding period; or, according to the situation that the actual base station system carries important information, the storage position is set at the position of the offset starting position preset time sequence of each store-and-forward period, that is, the position of the storage time sequence has an initial offset. For example, the PBCH and system information (SIB1) of the 5GNR base station and the 5GNR system are not available for each frame, and the base station frame with PBCH and system information (SIB1) can be selected by setting an offset.

Taking the case that the storage time sequence position is set at the initial position of each storage and forwarding period (namely, the initial offset is set to be 0), receiving a base station frame at the storage time sequence position, decoding the base station frame, extracting a corresponding radio frequency signal, then periodically forwarding the extracted radio frequency signal according to a storage and forwarding rule to obtain shielding of one storage time sequence period, and storing and periodically forwarding through a plurality of storage and forwarding periods until completing one-round frame sequence number period of the base station; and then the next round of frame number cycle is started.

In the shielding method provided in this embodiment, the identification frame and the synchronization timing position for performing synchronization timing are obtained from the frame signal sent by the synchronization reference device in different frame periods, and are clock-aligned with the synchronization timing position, so that the timing of the device to be synchronized and the synchronization reference device are synchronized, and then the base station frame is stored in the storage timing position and periodically forwarded to perform shielding work. According to the shielding method, the equipment in the system is selected as the synchronous reference equipment, so that no external signal is introduced, the material cost and the maintenance cost for additionally installing the external equipment can be saved, and the cost is reduced; meanwhile, the identification frame and the synchronous time sequence position sent by the synchronous reference equipment are acquired, so that the synchronous equipment to be shielded can quickly and efficiently acquire time sequence synchronization, the synchronous time is shortened, the shielding work is accelerated to start, and the current progress of the base station can be judged at any time according to the identification frame and the synchronous time sequence position.

Further, please refer to fig. 5, after step S300, the shielding method further includes step S500.

Step S500, storing the base station frame at the storage time sequence position, and acquiring the main synchronization signal time of the base station frame; and correcting the clock alignment according to the time of the master synchronization signal. Specifically, a base station frame is stored at a storage time sequence position, a primary synchronization signal time PSS time of the base station frame is obtained, and an internal clock of the shielding device is corrected by taking the PSS time as a reference. Thus, the clock fine tuning can be realized to obtain precise timing synchronization through step S500.

Further, referring to fig. 5, before step S300, the shielding method further includes step S600.

Step S600, a store-and-forward rule of a store-and-forward period is set according to the base station radio frequency band and the public frame period.

The base station radio frequency band refers to a frequency range which can be transmitted by each base station; the common frame period refers to a common period for masking update changes of all frame signals of the system. The store-and-forward rule comprises a store-and-forward cycle number, a cycle time length, a store time sequence position, a forward time sequence position, a store time length and a forward time length.

Optionally, when the shielding system includes a plurality of base stations in the same radio frequency band and the same duration frame period, the frame period of each base station is used as the common frame period. For example: the frame periods of the base stations of 5GNR, 4G and 3G (WCDMA, TD-SCDMA) are all 10ms, namely the updating change time of each frame signal is 10ms, and the shielding system takes 10ms as the common frame period.

Optionally, when the shielding system includes a plurality of base stations in the same radio frequency band but with frame periods of different durations, a least common multiple period of the frame periods of the respective base stations is used as the common frame period. For example: the frame period of CDMA (Code Division Multiple Access) is 80/3ms, the frame period of 5GNR is 10ms, and the frame period of the least common Multiple of the common frame period of the two shared frequency bands is 80 ms; similarly, the frame period of GSM (Global System for Mobile Communications) is 15/26ms, the least common multiple frame period of the common frame period with LTE is 30ms, and the least common multiple frame period of the common frame period with CDMA, LTE, and GSM is 240 ms.

Optionally, the frame number period and the number of frame signals of a whole cycle of the base station frame are determined according to the radio frequency band of the base station and the common frame period, and a store-and-forward rule is set according to the frame number period and the number of frame signals. When the shielding system has a plurality of base stations with frame number periods of different durations, the setting is carried out according to the common frame number period or the frame number period corresponding to the respective system frequency band, namely, the base stations with different frame number periods are respectively processed after being filtered or processed by a least common multiple method. For example, when the base station communication networks of 3G (WCDMA, TD-SCDMA), 4G and 5GNR exist at the same time, the frame number period of the base station of 3G (WCDMA, TD-SCDMA), 4G and 5GNR is the same and the base station communication network of 5GNR is the most complicated, so the system is set with the frame number period of the base station of 5 GNR. Specifically, the frame number period of the whole turn of the 5GNR base station frame (hereinafter abbreviated as 5GNR frame number period) is 10240ms, from 0 to 1023, 1024 frame signals are transmitted, and the period of 10240ms is recycled.

Optionally, the number of store-and-forward cycles is at least 1. When the number of the store-and-forward cycles is 1, a base station frame can be stored, and the base station finishes transmitting the frame signal after repeating the cycles for many times, in this case, the synchronous reference device can only be the base station, and the shielding device to be synchronized performs timing synchronization according to the unique identification frame in the base station frame and the corresponding synchronous timing position.

Optionally, the number N of store-and-forward cycles is set to at least 2. In this case, the synchronization reference device may be a base station or a synchronization shielding device, the identification frame may be a base station frame or a hopping frame, and the device to be shielded may perform timing synchronization with the base station at a store timing position of any store-and-forward period or perform timing synchronization with the synchronization shielding device at a forward timing position of the store-and-forward period.

When N is at least 2, in order to facilitate the system to quickly and efficiently identify the base station frame and the hopping frame, N may be set to 2 according to the commonality that the communication code combination is 2N times^XDividing the total number of frame signals by N to obtain the number Y of frames (including received frames, stored in the storage time sequence position) of each store-and-forward periodA frame signal).

Taking the frame period of the same radio frequency band and the same duration as an example:

taking a plurality of base stations with a frame period of 10ms and a round of frame signal total of 1024 as an example, Y is 1024/N.

Referring to fig. 6, if X is set to 3, N is 8, Y is 128: that is, within 10240ms, 8 store-and-forward cycles are provided, each store-and-forward cycle being 128 × 10 — 1280ms, the store cycle being 10ms, and each forward cycle being 10 ms. Taking the example that the storage timing position is set at the start position of each store-and-forward cycle (i.e. the initial offset is set to 0), then forwarding 127 times after storing one frame: in the first store-and-forward period, storing the 0 th frame, and performing 127 times of periodic forwarding on the 0 th frame (namely transmitting to the 127 th frame mask frame); entering a second store-and-forward period, storing a 128 th frame, and performing 127-time periodic forwarding on the 128 th frame; and so on, in the third store-and-forward period, the 256 th frame is used for store-and-forward; in the eighth store-and-forward period, 896 th frame is used for store-and-forward until the end of 1023 frames of the mask frame; and then the next round of frame number cycle is started. At this time, when the synchronization reference device is a base station, the device to be synchronized may obtain a synchronization timing sequence with the base station at the storage timing sequence position of the 0 th frame in the first store-and-forward period, or obtain a synchronization timing sequence with the base station at the storage timing sequence position of any other store-and-forward period; when the synchronous reference device is a synchronous shielding device, the device to be synchronized may obtain a synchronous timing sequence with the synchronous shielding device at the timing position forwarded in the 1 st cycle of the first store-and-forward cycle, or obtain a synchronous timing sequence with the synchronous shielding device at the timing position forwarded in the 1 st cycle of any other store-and-forward cycle; when the synchronous reference device is the base station and the synchronous shielding device at the same time, the synchronous timing can be obtained by any scheme of the two schemes.

Referring to fig. 7, if X is set to 1, N is 2, Y is 512: that is, within 10240ms, 2 store-and-forward cycles are provided, and each store-and-forward cycle is 512 × 10 — 5120 ms. Taking the example that the storage timing position is set at the initial position of each store-and-forward cycle, that is, the initial offset is set to 0, then the frame is stored and forwarded 511 times: in the first storing and forwarding period, storing a 0 th frame, and performing 511 times of periodic forwarding on the 0 th frame (namely transmitting to a 511 th frame mask frame); entering a second store-and-forward period, storing a 512 th frame, and periodically forwarding the 512 th frame 511 times until the shielding frame is 1023 frames; and then the next round of frame number cycle is started.

The following description will be given by taking frame periods of the same radio frequency band but different durations as examples:

for example, a 5G base station with a frame period of 10ms and a GSM base station with a slot period of 15/26ms work at the same frequency, so that the common frame period is 30ms (the least common multiple of the GSM slot period and the 5G frame period), and needs to be spliced into 30ms (divided into three frames of 1 st, 2 nd, 3 rd 10ms, that is, corresponding to 5G), and 3 frames of the 5G base station need to be the whole storage length, that is, the storage duration is 30 ms. The 5G system frame number cycles to 10240ms each round, and 3 rounds are one complete cycle period. On one hand, one frame is taken out in an aligned mode, the 30ms is achieved through the combination of three frames, and the 30ms common frame is used for storing and forwarding (frames in each memory are replaced in a rolling mode), so that the shielding can be guaranteed not to be interrupted due to replacement; on the other hand, the receiving of the three frames in the common frame and the forwarding period thereof accord with the rule of 30ms whole period, the GSM signals corresponding to the three 5G frame periods and 10ms are ensured to be respectively aligned with the GSM time slot period, and the timing synchronization of the 5G base station and the GSM base station in the system is ensured.

Referring to fig. 8, if X is 3, N is 8, Y is 128: namely, within a 5G system frame number cycle of 10240ms, 8 sections of store-and-forward cycles are set in each round, the duration of each store-and-forward cycle is 128 × 10 — 1280ms, the common multiple frame period is 30ms, and each common multiple frame forward cycle is 30 ms. Since 1280 cannot be divided by 30, the remainder is 2{ when (1280+10), it can be divided by 30 }, so that the first time (frame 0 is received, assuming the first identified frame is frame 0) is stored first for the first 10ms (the position of the first frame), the second time (frame 128 is received) is stored for the 3 rd 10ms (the position of the second frame), that is, 10ms corresponding to one (negative sequence) position is withdrawn (which is also a requirement of alternate replacement), and the 2 nd 10ms is stored in the third (frame 256) (the corresponding position is replaced by an arrow in the figure, only the first 4 are taken as examples, wherein for the convenience of marking, "store 1 st frame", "store 2 nd frame" and "store 3 rd frame" are abbreviated as "1 st frame", "2 nd frame" and "3 rd frame", respectively), and a cycle is started after the timing position alignment received in the 0 th frame (wherein, "store in" means to store into the memory of the mask device). Alternatively, frame 128 may be received instead to store the replacement "frame 3"; by analogy, receiving frame number 256 stores the replacement "frame 2".

For example, the shielding system includes a 5G base station with a frame period of 10ms and a CDMA (including DVDO and 1X) base station with a pilot period of 80/3ms, and then the common frame period is 80ms (the least common multiple of 80/3ms and 10 ms), and needs to be spliced into 80ms (divided into 1 st, 2 nd, 3 rd, … … th and 8 th 10ms, each 10ms corresponds to a frame of the 5G base station), and 8 frames of the 5G base station need to be the storage length of the whole common multiple frame, that is, the storage duration is 80ms, and when all 8 frames of the 5G base station are replaced, a complete cycle period is realized. On one hand, by aligning the combination for 80ms and then forwarding the aligned combination by using the 80ms storage (rolling and replacing the frames in each memory), the shielding can be ensured not to be interrupted by replacement; on the other hand, the forwarding period of each frame conforms to the rule of 80ms, and eight 5G frame periods are ensured to be aligned with the CDMA time slot, so that the timing synchronization of the system is ensured.

For the convenience of system identification, in each cycle, X is 4, N is 16, Y is 64: that is, 16 store-and-forward cycles are set in each round within 10240ms, the duration of each store-and-forward cycle is 64 × 10 — 640ms, the common frame storage cycle is 80ms, and each forward cycle is 80 ms.

Specifically, please refer to fig. 9 (the arrows in the figure list 7 alternative corresponding positions, which correspond to the timing positions of the 1 st to 4 th base station identification frames, and the timing positions of the 9 th to 11 th base station identification frames, respectively, wherein for convenience of marking, "store 1 st frame", "store 2 nd frame", … …, and "store 8 th frame" are abbreviated as "1 st frame", "2 nd frame", … …, and "8 th frame"), first start to replace the 1 st (0 th frame) of the 8 frames in the memory, that is, forward 8 rounds every 640ms, postpone one 10ms to receive the base station frames (alternate replacement rule), that is, fill the 2 nd frame of the 8 frame memories with the 65 th frame, sequentially classify to the 455 th frame to replace the 8 th frame, and repeat again. And updating for 2 times within 10240ms (once 6400ms, then 0, i.e. the offset is 0), and sequentially replacing the frame numbers (0 th, 65 th, 130 th, 195 th, 260 th, 325 th, 390 th, 455 th) (note that at the 456 th frame time of the base station, the frame numbers stored in the memory are sequentially 0 th, 65 th, 130 th, 195 th, 260 th, 325 th, 390 th, 455 th, and the system frame number in the forwarding memory is 0 th frame), sequentially replacing one frame (replacing 8 times), and sequentially replacing the frame numbers with changes (512 th, 577 th, 642 th, 707 th, 772 th, 837 th, 902 th, 967 th frame numbers stored in the memory are sequentially 512 th, 577 th, 642 th, 707 th, 772 rd, 837 th, 902 th, 967 th, and the system frame number in the forwarding memory is 512 th frame number).

Therefore, according to the store-and-forward rule in the optional embodiment and other store-and-forward rules set according to actual conditions, the device to be synchronized can conveniently and efficiently obtain synchronization with the base station and other synchronous shielding devices at the time of changing the stored frame number, and meanwhile, the current progress of the base station can be judged at any time according to the time of changing the forwarded frame number. Furthermore, the synchronous time sequence can be corrected according to the judged current progress of the base station.

It should be understood that although the various steps in the flowcharts of fig. 1-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.

Referring to fig. 10, fig. 10 is a block diagram illustrating a shielding system for performing the shielding method according to the above embodiment.

For details, please refer to fig. 1 and the related description in the embodiment corresponding to fig. 1, which are not repeated herein. In this embodiment, the shielding system includes a base station and a plurality of shielding devices, at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices does not acquire timing synchronization with the synchronous reference device; the shielding apparatus includes a first obtaining module 100, a second obtaining module 200, a timing synchronization module 300, and a store-and-forward module 400. Specifically, the method comprises the following steps:

the first obtaining module 100 is configured to receive an air signal in a shielded area, and obtain frame signals sent by a synchronous reference device in a plurality of different frame periods.

The second obtaining module 200 is connected to the first obtaining module 100, and is configured to obtain an identification frame used for performing synchronization timing in the plurality of frame signals and a synchronization timing position corresponding to the identification frame.

The timing synchronization module 300, connected to the second obtaining module 200, is configured to obtain timing synchronization with the synchronization reference device according to the identification frame and the synchronization timing position.

The store-and-forward module 400, connected to the first obtaining module 100 and the timing synchronization module 300, is configured to store the radio frequency signal of the base station frame at the store-and-forward timing position, and periodically forward the radio frequency signal at the forward timing position of the store-and-forward period to perform the shielding operation.

The shielding system provided by the embodiment comprises a base station and a plurality of shielding devices, wherein at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices is not in time sequence synchronization with the synchronous reference device; the shielding device comprises a first acquisition module, a second acquisition module, a time sequence synchronization module and a storage and forwarding module, wherein the first acquisition module and the second acquisition module acquire identification frames and synchronous time sequence positions for synchronizing time sequences from frame signals sent by the synchronous reference device in different frame periods, the time sequence synchronization module acquires time sequence synchronization with the synchronous reference device, and then the storage and forwarding module stores base station frames in the stored time sequence positions and forwards the frames periodically to perform shielding work. According to the shielding system, the equipment in the system is selected as the synchronous reference equipment, so that no external signal is introduced, the material cost and the maintenance cost for additionally installing the external equipment can be saved, and the cost is reduced; meanwhile, the first acquisition module and the second acquisition module acquire the identification frame and the synchronous time sequence position sent by the synchronous reference equipment, so that the time sequence synchronization module can quickly and efficiently acquire time sequence synchronization, the synchronization time is shortened, the storage and forwarding module is accelerated to start shielding work, and a shielding system can also judge the current progress of the base station at any time according to the identification frame and the synchronous time sequence position.

Referring to fig. 11, fig. 11 is a schematic diagram of a detailed structure of the second obtaining module 200 in the embodiment shown in fig. 10.

For details, please refer to fig. 2 and the related description in the embodiment corresponding to fig. 2, which are not repeated herein. The second acquiring module 200 of the present embodiment includes a first determining unit 201, a segmenting unit 202, a first setting unit 203, and a first position acquiring unit 204. Specifically, the method comprises the following steps:

the first determining unit 201 is configured to determine that the frame signal is a base station frame if the frame number change rule of the plurality of frame signals matches the frame number change rule of the base station.

A segmenting unit 202 configured to segment the timing positions corresponding to the plurality of base station frames.

The first setting unit 203 is configured to set a base station frame corresponding to a preset timing position in each segment as an identification frame for performing timing synchronization.

The first position acquiring unit 204 is configured to acquire a synchronization timing position corresponding to the identification frame.

Referring to fig. 12, fig. 12 is a schematic diagram illustrating a detailed structure of the second obtaining module 200 in the embodiment shown in fig. 10.

For details, please refer to fig. 3 and the related description in the embodiment corresponding to fig. 3, which are not repeated herein. The second acquiring module 200 of the present embodiment includes a second determining unit 205, a second setting unit 206, and a second position acquiring unit 207.

Specifically, the method comprises the following steps:

the second determination unit 205 is configured to determine that the frame signal is a mask frame if the frame number change rule of the plurality of frame signals matches the frame number change rule of the store-and-forward period.

The second setting unit 206 is configured to set the transition frame in the mask frame as an identification frame for performing timing synchronization.

The second position obtaining unit 207 is configured to obtain a synchronization timing position corresponding to the transition frame.

Referring to fig. 13, fig. 13 is a schematic diagram illustrating a detailed structure of the timing synchronization module 300 in the embodiment shown in fig. 10.

For details, please refer to fig. 4 and the related description in the embodiment corresponding to fig. 4, which are not repeated herein. The timing synchronization module 300 of the present embodiment includes a first timing synchronization unit 301 and a second timing synchronization unit 302. Specifically, the method comprises the following steps:

the first timing synchronization unit 301 is configured to align the stored timing position with the synchronization timing position clock if the identification frame is a base station frame, and obtain timing synchronization with the synchronization reference device.

The second timing synchronization unit 302 is configured to align the forwarded timing position with the synchronization timing position clock if the identification frame is a mask frame, so as to obtain timing synchronization with the synchronization reference device.

Referring to fig. 14, fig. 14 is a block diagram of another shielding system for performing the shielding method of the above embodiment on the basis of fig. 10.

For details, please refer to fig. 5 and the related description in the embodiment corresponding to fig. 5, which are not repeated herein. In this embodiment, the shielding system includes a base station and a plurality of shielding devices, at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices does not acquire timing synchronization with the synchronous reference device; the shielding apparatus includes a first obtaining module 100, a second obtaining module 200, a timing synchronization module 300, a store-and-forward module 400, a modification module 500, and a setting module 600. Specifically, the method comprises the following steps:

for the description of the first obtaining module 100, the second obtaining module 200, the timing synchronization module 300, and the store-and-forward module 400, please refer to fig. 10 and the related description in the embodiment corresponding to fig. 10, which are not repeated herein.

A correction module 500, respectively connected to the first obtaining module 100, the timing synchronization module 300 and the store-and-forward module 400, configured to store a base station frame at a stored timing position and obtain a primary synchronization signal time of the base station frame; and correcting the clock alignment according to the time of the master synchronization signal. The correction module 500 can achieve fine clock adjustment to achieve precise timing synchronization.

The setting module 600 is connected to the first obtaining module 100 and the store-and-forward module 400, and is configured to set a store-and-forward rule of a store-and-forward period according to a base station radio frequency band and a common frame period.

It should be noted that the division of each module in the shielding system is only used for illustration, and in other embodiments, the shielding system may be divided into different modules as needed to complete all or part of the functions of the shielding system.

An embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor is enabled to execute the steps of the shielding method according to the above embodiment.

The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the masking method in any of the embodiments described above.

Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and bus dynamic RAM (RDRAM).

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A shielding method of synchronous time sequence is applied to a shielding system and is characterized in that the shielding system comprises a base station and a plurality of shielding devices, wherein at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices does not acquire time sequence synchronization with the synchronous reference device; the shielding method comprises the following steps:

storing the radio frequency signals of a base station frame at a storage time sequence position of a preset storage and forwarding period, and periodically forwarding the radio frequency signals at a forwarding time sequence position of the storage and forwarding period to shield the radio frequency signals;

the step of acquiring an identification frame for synchronizing the timing sequence and a synchronization timing sequence position corresponding to the identification frame in the plurality of frame signals includes:

if the frame number change rules of the plurality of frame signals are matched with the frame number change rules of the store-and-forward period, judging the frame signals to be shielding frames;

setting a hopping frame in the shielding frames as an identification frame for carrying out time sequence synchronization;

and acquiring a synchronous time sequence position corresponding to the hopping frame.

2. The masking method according to claim 1, wherein the step of obtaining the identification frame for performing the synchronization timing and the synchronization timing position corresponding to the identification frame in the plurality of frame signals comprises:

if the frame number change rules of the plurality of frame signals are matched with the frame number change rule of the base station, judging that the frame signals are base station frames;

segmenting the time sequence positions corresponding to the plurality of base station frames;

setting a base station frame corresponding to a preset time sequence position in each section as an identification frame for carrying out time sequence synchronization;

and acquiring a synchronous time sequence position corresponding to the identification frame.

3. The masking method of claim 2, wherein the step of obtaining timing synchronization with the synchronization reference device based on the identification frame and the synchronization timing position comprises:

and if the identification frame is the base station frame, aligning the storage time sequence position with the synchronous time sequence position clock to obtain the time sequence synchronization with the synchronous reference equipment.

4. The shielding method according to claim 2, wherein the frame number change rule of the base station is that the frame number continuously and incrementally changes with time.

5. The masking method of claim 1, wherein the step of obtaining timing synchronization with the synchronization reference device based on the identification frame and the synchronization timing position comprises:

and if the identification frame is the shielding frame, aligning the forwarding time sequence position with the synchronous time sequence position clock to obtain the time sequence synchronization with the synchronous reference equipment.

6. The masking method of claim 1, wherein the frame number change rule of the store-and-forward cycle is that the frame number changes in a segmented manner over time and does not change in the same time period.

7. The shielding method according to claim 3 or 5, characterized in that the shielding method further comprises:

storing the base station frame at the storage time sequence position, and acquiring the main synchronization signal time of the base station frame;

and correcting the clock alignment according to the time of the master synchronization signal.

8. The shielding method according to any one of claims 1 to 6, characterized in that the shielding method further comprises:

and setting the store-and-forward rule of the store-and-forward period according to the radio frequency band of the base station and the public frame period.

9. The shielding method according to claim 8, wherein when the shielding system includes a plurality of base stations in the same rf band and having frame periods of the same duration, the frame period of each base station is used as the common frame period.

10. The method according to claim 8, wherein, when the shielding system includes a plurality of base stations of the same radio frequency band but different time frame periods, a least common multiple period of the frame periods of the respective base stations is used as the common frame period.

11. The masking method of claim 8, wherein the store-and-forward rules include a number of store-and-forward cycles, a cycle duration, a store timing location, a forward timing location, a store duration, and a forward duration.

12. The masking method of claim 11, wherein the store timing location is set at a start location of each store-and-forward cycle; or, the storage location is set at a location shifted from the starting location by a preset time sequence in each store-and-forward cycle.

13. The masking method of claim 11, wherein the number of store-and-forward cycles is at least 2.

14. A shielding system for synchronizing time sequence is characterized by comprising a base station and a plurality of shielding devices, wherein at least one of the base station and the plurality of shielding devices is a synchronous reference device, and at least one of the plurality of shielding devices is not synchronized with the synchronous reference device in time sequence; the shielding apparatus includes:

the storage and forwarding module is connected with the first acquisition module and the time sequence synchronization module and is configured to store the radio frequency signals of the base station frame at the storage time sequence position and periodically forward the radio frequency signals at the forwarding time sequence position of the storage and forwarding period so as to perform shielding work;

wherein the second obtaining module comprises:

a second determination unit configured to determine that the frame signal is a mask frame if a frame number change rule of the plurality of frame signals matches a frame number change rule of the store-and-forward period;

a second setting unit, configured to set a hopping frame in the mask frames as an identification frame for performing timing synchronization;

and the second position acquisition unit is arranged to acquire the synchronous time sequence position corresponding to the hopping frame.

15. The shielding system of claim 14, wherein the second acquisition module comprises:

a first determination unit configured to determine that the frame signal is a base station frame if a frame number change rule of the plurality of frame signals matches a frame number change rule of the base station;

a segmentation unit configured to segment the timing positions corresponding to the plurality of base station frames;

the first setting unit is used for setting the base station frame corresponding to the preset time sequence position in each section as an identification frame for carrying out time sequence synchronization;

and the first position acquisition unit is arranged to acquire the synchronous time sequence position corresponding to the identification frame.

16. The masking system of claim 15, wherein the timing synchronization module is further configured to clock align the stored timing position with the synchronized timing position to obtain timing synchronization with the synchronous reference device if the identification frame is the base station frame;

the shielding apparatus further includes:

the correction module is respectively connected with the first acquisition module, the time sequence synchronization module and the storage and forwarding module, and is configured to store a base station frame at the storage time sequence position and acquire a main synchronization signal moment of the base station frame; and correcting the clock alignment according to the time of the master synchronization signal.

17. The masking system of claim 14, wherein the timing synchronization module is further configured to clock align the forwarding timing position with the synchronous timing position to obtain timing synchronization with the synchronous reference device if the identification frame is the masking frame;

the shielding apparatus further includes:

18. The shielding system of any one of claims 14-17, wherein the shielding device further comprises:

and the setting module is connected with the first acquisition module and the time sequence synchronization module and is used for setting a store-and-forward rule of the store-and-forward period according to a base station radio frequency band and a public frame period.