WO2021057028A1 - Procédé et système de protection permettant d'obtenir une temporisation synchrone - Google Patents

Procédé et système de protection permettant d'obtenir une temporisation synchrone Download PDF

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Publication number
WO2021057028A1
WO2021057028A1 PCT/CN2020/087954 CN2020087954W WO2021057028A1 WO 2021057028 A1 WO2021057028 A1 WO 2021057028A1 CN 2020087954 W CN2020087954 W CN 2020087954W WO 2021057028 A1 WO2021057028 A1 WO 2021057028A1
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WIPO (PCT)
Prior art keywords
frame
synchronization
timing
shielding
base station
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PCT/CN2020/087954
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English (en)
Chinese (zh)
Inventor
曹永福
张宏亮
林晓君
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浙江三维通信科技有限公司
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Publication of WO2021057028A1 publication Critical patent/WO2021057028A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/60—Jamming involving special techniques
    • H04K3/68—Jamming involving special techniques using passive jamming, e.g. by shielding or reflection

Definitions

  • This application relates to the field of wireless mobile communication technology, and in particular to a shielding method and a shielding system for synchronized timing.
  • wireless communication networks In order to achieve timing synchronization, wireless communication networks usually use external signals from the system for synchronization, such as GPS to achieve timing synchronization.
  • external signals from the system for synchronization such as GPS to achieve timing synchronization.
  • this solution requires additional installation of receiving antennas, and has a high failure rate and difficult maintenance, which greatly increases the engineering cost.
  • a shielding method for synchronized timing is applied to a shielding system.
  • the shielding system includes a base station and multiple shielding devices. At least one of the base station and the multiple shielding devices is a synchronous reference device, and multiple shields At least one of the devices has not obtained timing synchronization with the synchronization reference device; the shielding method includes:
  • the radio frequency signal of the base station frame is stored at the storage timing position of the preset store-and-forward cycle, and the radio frequency signal is periodically forwarded to perform the shielding work at the forwarding timing position of the store-and-forward cycle.
  • 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
  • the timing synchronization is not obtained with the synchronization reference device; the shielding device includes:
  • the first acquisition module is configured to receive the air signal in the shielded area, and acquire the frame signal sent by the synchronization reference device in multiple different frame periods;
  • a second acquisition module connected to the first acquisition module, and configured to acquire identification frames used for synchronization timing among a plurality of frame signals and synchronization timing positions corresponding to the identification frames;
  • a timing synchronization module connected to the second acquiring module, and 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 is connected to the first acquisition module and the timing synchronization module, and is configured to store the radio frequency signal of the base station frame at the storage timing position, and cycle the radio frequency signal at the forwarding timing position of the store-and-forward cycle Forward for blocking work.
  • the above-mentioned shielding method and shielding system obtain the identification frame and synchronization timing position for synchronization timing from the frame signals sent by the synchronization reference device in different frame periods, and obtain the shielded device to be synchronized and the synchronization reference device according to the identification frame and the synchronization timing position.
  • the time sequence is synchronized, and then the base station frame is stored in the storage time sequence location and forwarded periodically for shielding work.
  • the shielding method and shielding system by selecting the equipment inside the system as the synchronization reference equipment, does not introduce external signals, so as to save the material cost and maintenance cost of the additional installation of external equipment, and reduce the cost; at the same time, by sending the synchronization reference equipment
  • the acquisition of the identification frame and the synchronization timing position can enable the synchronization device to be shielded to quickly and efficiently obtain timing synchronization, reduce the synchronization time and speed up the start of the 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.
  • FIG. 1 is a flowchart of a method for shielding synchronization timing in an embodiment
  • FIG. 2 is a flowchart corresponding to step S200 in FIG. 1 in an embodiment
  • FIG. 3 is a flowchart corresponding to step S200 in FIG. 1 in an embodiment
  • FIG. 4 is a flowchart corresponding to step S300 in FIG. 1 in an embodiment
  • FIG. 5 is a flowchart of a method for shielding synchronization timing in another embodiment
  • Figure 6 is a schematic diagram of a store-and-forward rule in an embodiment
  • Figure 7 is a schematic diagram of a store-and-forward rule in an embodiment
  • Figure 8 is a schematic diagram of a store-and-forward rule in an embodiment
  • Figure 9 is a schematic diagram of a store-and-forward rule in an embodiment
  • FIG. 10 is a structural diagram of a shielding device for performing the shielding method of FIG. 1 in an embodiment
  • FIG. 11 is a structural diagram of a second acquisition module that executes step S200 in FIG. 2 in an embodiment
  • FIG. 12 is a structural diagram of a second acquisition module that executes step S200 in FIG. 3 in an embodiment
  • FIG. 13 is a structural diagram of a timing synchronization module that executes step S300 in FIG. 4 in an embodiment
  • Fig. 14 is a structural diagram of a shielding device for performing the shielding method of Fig. 5 in an embodiment.
  • FIG. 1 is a flowchart of a method for shielding synchronization timing in an embodiment.
  • the synchronization timing shielding method is applied to a shielding system.
  • the shielding system includes a base station and multiple shielding devices. At least one of the base station and the multiple shielding devices is a synchronization reference device, and at least one of the multiple shielding devices The station has not obtained timing synchronization with the synchronization reference device (defined as the shielded device to be synchronized).
  • the shielding device stores base station frames and performs periodic forwarding shielding.
  • the periodically forwarded signal (defined as a shielded frame) is the same as the original downlink base station signal (defined as a base station frame) of the base station.
  • they are all downlink base station frames.
  • the mobile phone cannot distinguish whether the frame signal is a base station frame or a shielded frame.
  • the signal strength of the shielded frame is greater than the original signal strength sent by the base station, the decoding will fail and lose the network connection, which is effective.
  • the purpose of shielding is used.
  • the shielding device When the shielding device performs shielding work, it needs to synchronize with the base station timing to realize the timing alignment of the shielding frame and the base station frame; when multiple shielding devices are synchronized in timing and performing shielding work, multiple shielding devices are synchronized with the base station timing at the same time.
  • the shielding method includes step S100, step S200, step S300, and step S400.
  • the details are as follows:
  • Step S100 Receive the air signal in the shielded area, and obtain the frame signal sent by the synchronization reference device in multiple different frame periods.
  • the synchronization reference device may be a base station or a synchronization shielding device (a shielding device that has obtained timing synchronization).
  • the synchronization reference device is the base station; optionally, when there is at least one synchronization shielding device in the shielding system, the synchronization reference device can be a synchronization shielding device and/ Or base station.
  • the shielding area refers to the area that can be covered by the shielding frames of all shielding devices;
  • the air signal refers to the signal that the shielding device to be synchronized can receive, including base station frames and/or shielding frames.
  • the air signal is the base station frame; when there is at least one synchronized shielding device in the shielding system, the air signal includes the base station frame and the shielding frame.
  • the shielded frame and the base station frame have the same frequency, the same modulation mode and timing alignment, and because the shielded frame is forwarded periodically, the frame sequence number change rule of multiple consecutive shielded frames and the frame sequence number change rule of multiple consecutive base station frames Different; and the signal strength of the shielded frame of the same frame period is greater than the signal strength of the base station frame.
  • step S100 can quickly obtain frame signals of the same signal strength level by comparing signal strength values to ensure that the frame signals originate from a synchronization reference device or from multiple synchronization reference devices at the same distance from the shielded device to be synchronized.
  • the same signal strength level means that the frame signal strength is the same or in the same numerical range, and the frame signals of the same signal strength level originate from the same device or from multiple devices at the same distance from the shielded device to be synchronized.
  • step S100 specifically includes: receiving an air signal in the shielding area, decoding to obtain a signal strength value of the air signal, and obtaining a frame signal corresponding to the strongest signal strength value in each frame period.
  • Step S200 Obtain an identification frame used for synchronization timing among multiple frame signals and a synchronization timing position corresponding to the identification frame.
  • the identification frame is defined as an identification signal for synchronization timing between the shielded device to be synchronized and the synchronization reference device; when this identification signal is detected, the shielded device to be synchronized and the synchronization reference device perform synchronization timing;
  • the synchronization timing position is defined as the corresponding time point or time period of the identification frame in the entire frame sequence number cycle frame period, at which time point or time period the shielded device to be synchronized and the synchronization reference device synchronize the timing. For example, if the frame signal of the entire round frame period is the 0th frame, the first frame, the second frame, ...
  • the cycle length of the entire round frame period is 10240 milliseconds (ms), and the period of each frame period
  • the length is 10 ms, and assuming that the identification frame is the 0th frame, the synchronization timing position corresponding to the 0th frame is the time period from the start time to the 10th ms.
  • the number of identification frames is at least one.
  • the setting of the identification frame can be the same or different.
  • the base station frame corresponding to a certain frame sequence number can be arbitrarily set as the identification frame, for example, the base station frame with the frame sequence number of the first frame, the 129th frame, and the 259th frame as the identification frame Frame;
  • the special frame can be arbitrarily defined as the identification frame according to the store-and-forward rules, for example, the hopping frame is set as the identification frame; optionally, the base station frame is changed according to the store-and-forward rule
  • the identification frame of the base station frame and the transition frame in the shielding frame are combined.
  • the identification frame of the base station frame and the transition frame in the shielding frame are the frame signals of the same frame number and adjacent timing positions, to be shielded synchronously
  • the device first receives the base station frame, and then receives the hopping frame in the shielding frame. At this time, the frame signal that hops for the first time in the system is actually the base station frame.
  • Step S200 includes step S201, step S202, step S203, and step S204.
  • Step S201 If the frame sequence number change rule of the multiple frame signals matches the signal transmission rule of the base station, it is determined that the frame signal is a base station frame.
  • the frame sequence number change rule of the base station is that the frame sequence number changes continuously with time. For example, in a period of time, with the change of time, the frame sequence numbers of consecutive multiple base station frames are 0th, 1st, and 2nd, respectively. , No. 3....... Therefore, the type of frame signal can be quickly determined through the determination of the frame sequence number change rule.
  • Step S202 Segment the time sequence positions corresponding to multiple base station frames.
  • step S202 divides the time sequence positions corresponding to multiple base station frames into segments, so that the time sequence position of the identification frame can be set in each segment.
  • the duration between different time periods may be the same or different, as long as the synchronization timing positions corresponding to the identification frames have regularity.
  • step S202 can be divided into time periods of the same duration.
  • the time sequence position corresponding to the base station frame may be segmented according to the radio frequency band of the base station.
  • the timing positions corresponding to the multiple base station frames are divided into 8 segments.
  • the timing of the frame signal in the 8 segments is the 0th sequence, the first sequence,..., the 127th sequence, the 128th sequence, the 129th sequence, and the «, the 255th sequence,. «
  • Step S203 Set the base station frame corresponding to the preset timing position in each segment as an identification frame for timing synchronization. After the segmentation in step S202, the base station frame corresponding to a predetermined time sequence position in each segment can be arbitrarily set 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 Acquire the synchronization timing position corresponding to the identification frame.
  • the corresponding frame sequence 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 sequence number.
  • Step S200 includes step S205, step S206, and step S207.
  • Step S205 If the frame sequence number change rule of the multiple frame signals matches the store-and-forward rule, it is determined that the frame signal is a shielded frame.
  • the frame sequence number change rule of the store-and-forward cycle is that the frame sequence number changes in segments with time and the frame sequence number does not change during the same time period. For example, in a period of time, with the change of time, multiple consecutive masks The frame numbers of the frames are 0th, 0th, 0th, 0th, ... 128th, 128th, 128th, 128th, ... 256th, 256th, 256th, 256th, ... respectively.
  • the frame number of multiple consecutive masked frames in the same time period is unchanged, but the same frame signal is forwarded multiple times. Therefore, the number of multiple frame signals with the same frame number in the same time period still needs to be Corresponding to the number of matching forwardings. Therefore, the type of frame signal can be quickly determined through the determination of the frame sequence number change rule.
  • Step S206 Set the hopping frame in the mask frame as an identification frame for timing synchronization. Due to the periodic forwarding characteristics of the masked frame, the frame sequence number of the masked frame does not change in the same time period, and the frame sequence number of the adjacent time period jumps. When the frame sequence number jumps, it can be detected quickly and efficiently, so it can be set The transition frame is used as the identification frame.
  • Step S207 Obtain the synchronization timing position corresponding to the hopping frame. Specifically, in step S207, the synchronization timing position corresponding to the identification frame may be obtained by decoding the identification frame.
  • the frame sequence number change rule of some frame signals matches the signal transmission rule of the base station, and the frame sequence number change rule of some frame signals matches the store-and-forward rule, then it is determined that the frame signal includes the base station frame And shield the frame.
  • the identification frame of the base station frame and the hopping frame in the shielding frame are frame signals with the same frame sequence number and adjacent timing positions.
  • the equipment to be synchronized with the shielding device first receives the base station frame, and then receives the shielding For the jump frame in the frame, the frame signal that jumps for the first time in the system is actually the base station frame.
  • step S200 the frame signal that jumps for the first time in the frame signal can be directly set as the identification frame for timing synchronization, and the frame signal is obtained.
  • the synchronization timing position corresponding to the identification frame alternatively, step S200 may also set the identification frame according to the embodiment of FIG. 2 or FIG. 3 and obtain the synchronization timing position corresponding to the identification frame.
  • step S200 if the frame sequence number change rule obtained by decoding the frame signal within the preset time in step S200 fails to match the frame sequence number change rule of the base station or the frame sequence number change rule of the store-and-forward cycle, an alarm is output , And return to step S100.
  • step S200 can achieve the acquisition of the identification frame and the synchronization timing position.
  • the synchronization device to be shielded in the subsequent steps can be quickly and efficiently obtained.
  • Timing synchronization, reducing the synchronization time and speeding up the start of the shielding work, and the current progress of the base station can be judged at any time according to the identification frame and the synchronization timing position: in the frame signal received by the synchronization device to be shielded, if the skipped frame is a shielded frame, it will skip The previous frame signal of the frame is the base station frame, so the timing position of the base station frame can be judged according to the synchronization timing position corresponding to the hopping frame. Further, the synchronization timing can also be corrected according to the determined current progress of the base station.
  • Step S300 Obtain timing synchronization with the synchronization reference device according to the identification frame and the synchronization timing position.
  • Step S300 includes: Step S301, if the identified frame is a base station frame, align the storage timing position of the preset store-and-forward period with the synchronization timing position clock to obtain timing synchronization with the synchronization reference device. At this time, the shielded device to be synchronized in the system obtains the timing synchronization with the base station at the storage timing position.
  • Step S300 includes: Step S302: If the frame is identified as a masked frame, align the forwarding timing position of the preset store-and-forward period with the synchronization timing position clock to obtain timing synchronization with the synchronization reference device. At this time, the shielding device to be synchronized in the system is synchronized with the timing of the synchronization shielding device at the forwarding timing position.
  • the storage timing position is defined as the corresponding time point or time period when the shielding device stores the base station frame during the base station frame storage and periodic forwarding.
  • the synchronization shielding device is set to store the base station in a time period of 10ms to 20ms. The first frame of transmission.
  • Aligning the storage timing position with the synchronization timing position clock means that the time point or time period of storing the base station frame is the same as the time point or time period of the base station transmitting the identification frame; aligning the forwarding timing position with the synchronization timing position clock means that the pre- It is assumed that the time point or time period when the shielding device to be synchronized first forwards the frame signal is the same as the time point or time period when the synchronization shielding device first forwards the shielded frame. For example, when the identification frame is a base station frame, if the identification frame is the first frame and the synchronization timing position is between 10ms and 20ms, the shielding device will start receiving the first frame at 10ms and stop at 20ms. receive. When the storage timing position is aligned with the synchronization timing position clock, the shielding device obtains timing synchronization with the synchronization reference device.
  • the authenticity of the timing synchronization with the synchronization reference device can also be determined. For example, acquiring the first base station frame stored by multiple synchronization shielding devices at the same storage timing position; if the frame sequence numbers of the multiple first base station frames correspond one-to-one, it is determined that the timing synchronization with the synchronization reference device is true.
  • step S400 the radio frequency signal of the identification frame is stored at the storage timing position, and the radio frequency signal is periodically forwarded to perform the shielding work at the forwarding timing position of the store-and-forward cycle.
  • the storage time sequence location can be set at the beginning of each store and forward cycle; or, according to the actual base station system carrying important information, the storage location can be set at a preset time sequence offset from the start position of each store and forward cycle , That is, the storage timing position has an initial offset.
  • the PBCH and system information (SIB1) of the 5GNR system are not available for every frame signal, and the base station frame with PBCH and system information (SIB1) can be selected by setting the offset.
  • the base station frame is received at the storage timing position, the base station frame is decoded, and the corresponding radio frequency signal is extracted, and then Periodically forward the extracted radio frequency signal according to the store-and-forward rules to obtain a storage timing cycle shielding, and store and forward through multiple store-and-forward cycles until the base station completes one round of frame sequence number cycle; then start the next round of frame sequence numbering cycle.
  • the shielding method provided in this embodiment obtains the identification frame and the synchronization timing position for synchronization timing from the frame signals sent by the synchronization reference device in different frame periods, and aligns with the synchronization timing position clock, so that the shielded device to be synchronized is synchronized with the synchronization timing position.
  • the timing of the reference device is synchronized, and then the base station frame is stored in the storage timing position and forwarded periodically to perform the shielding work.
  • the shielding method selects the equipment inside the system as the synchronization reference equipment without introducing external signals, thereby saving the material costs and maintenance costs of the additional installation of external equipment, and reducing the cost; at the same time, the identification frame and the synchronization reference equipment sent
  • the acquisition of the synchronization timing position enables the synchronization device to be shielded to quickly and efficiently obtain timing synchronization, reduces the synchronization time and speeds up the start of the 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.
  • the shielding method further includes step S500.
  • step S500 the base station frame is stored in the storage timing position, and the main synchronization signal time of the base station frame is obtained; the clock alignment is corrected according to the main synchronization signal time. Specifically, the base station frame is stored in the storage timing position, the main synchronization signal time PSS time of the base station frame is obtained, and the internal clock of the shielding device is corrected based on the PSS time. Thus, through step S500, the clock can be fine-tuned to obtain precise timing synchronization.
  • the shielding method further includes step S600.
  • step S600 a store-and-forward rule for the store-and-forward period is set according to the radio frequency band of the base station and the common frame period.
  • the base station radio frequency band refers to the frequency range that each base station can transmit;
  • the common frame period refers to the common period that shields the update and changes of all frame signals of the system.
  • Store-and-forward rules include the number of store-and-forward cycles, cycle duration, storage timing position, forwarding timing position, storage duration, and forwarding duration.
  • the frame period of each base station is used as the common frame period.
  • 5GNR, 4G, 3G (WCDMA, TD-SCDMA) base station frame cycle is 10ms, that is, the update change time of each frame signal is 10ms, then the shielding system uses 10ms as the common frame cycle.
  • the least common multiple period of the frame period of each base station is adopted as the common frame period.
  • CDMA Code Division Multiple Access, Code Division Multiple Access
  • 5GNR has a frame period of 10ms.
  • the common frame period of the two frequency bands is the least common multiple.
  • the frame period is 80ms; similarly, GSM
  • the frame period of (Global System for Mobile Communications, Global System for Mobile Communications) is 15/26ms, and its common frame period with LTE takes its least common multiple.
  • the frame period is 30ms.
  • the common frame period for the frequency bands shared by CDMA, LTE and GSM The frame period of the least common multiple is 240ms.
  • the frame sequence number period and the number of frame signals for a full round of the base station frame are determined according to the base station radio frequency band and the common frame period, and the store and forward rule is set according to the frame sequence number period and the number of frame signals.
  • the common frame sequence number period or the frame sequence number period corresponding to the respective system frequency bands that is, the base stations with different frame sequence number periods are filtered and processed separately, or take The least common multiple method is processed.
  • the system is set according to the frame sequence number cycle of the 5GNR base station.
  • the frame sequence number period of the entire round of the 5GNR base station frame (hereinafter abbreviated as the 5GNR frame sequence number period) is 10240 ms, from 0 to 1023, a total of 1024 frame signals, and a 10240 ms period is cyclically used.
  • the number of store-and-forward cycles is at least 1.
  • the synchronization reference device can only be the base station, and the shielded device to be synchronized is based on the base station frame. Uniquely identifies the frame and its corresponding synchronization timing position for timing synchronization.
  • the number of store-and-forward cycles N is set to at least 2.
  • the synchronization reference device can be a base station or a synchronization shielding device.
  • the identification frame can be a base station frame or a hopping frame.
  • the device to be shielded can synchronize the timing with the base station at the storage timing position of any store-and-forward cycle, or In the store-and-forward cycle, the forwarding timing position is synchronized with the shielding device.
  • N is at least 2
  • X is greater than or equal to 1
  • N divide by N
  • the number of frames Y per store-and-forward cycle is obtained (including received frames and frame signals stored in time sequence locations).
  • Y 1024/N.
  • the shielded device to be synchronized can obtain synchronization timing with the base station at the storage timing position of the 0th frame in the first store-and-forward cycle, or the storage timing position of any other store-and-forward cycle.
  • the base station obtains synchronization timing; when the synchronization reference device is a synchronization shielding device, the shielded device to be synchronized can obtain synchronization timing with the synchronization shielding device at the timing position of the first cycle forwarding in the first store-and-forward cycle, or other arbitrary storage
  • the timing position of the first periodic forwarding of the forwarding cycle and the synchronization shielding device obtain the synchronization timing; when the synchronization reference device is the base station and the synchronization shielding device at the same time, any one of the first two schemes can be selected to obtain the synchronization timing.
  • a frame is stored and then forwarded 511 times: in the first store-and-forward cycle, the 0th frame is stored, and Perform 511 cycles of forwarding on the 0th frame (that is, transmit to the 511th frame to mask the frame); enter the second store and forward cycle, store the 512th frame, and perform 511 cycles of forwarding on the 512th frame until the masked frame is 1023 frames End; start the next round of frame sequence number cycle.
  • the common frame period is 30ms (the least common multiple of the GSM time slot period and the 5G frame period), and it needs to be spliced into 30ms (divided).
  • the first, second, and third 10ms, that is, three frames corresponding to 5G), three 5G base station frames are required for the entire storage length, that is, the storage duration is 30ms.
  • the 5G system frame number cycle is 10240ms per round, and 3 rounds are a complete cycle.
  • the three frames are combined to reach 30ms, and then the 30ms common frame storage is used for forwarding (rolling to replace the frames in each memory), which can ensure that the shielding will not be interrupted due to replacement; on the other hand ,
  • the reception of the three frames in the common frame and its forwarding cycle conform to the 30ms full cycle rule, to ensure that the GSM signals corresponding to the three 5G frame cycles of 10ms are aligned with the GSM time slot cycle to ensure that the 5G base station in the system and GSM The timing of the base station is synchronized.
  • 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 the common frame period is 80ms (the least common multiple of 80/3ms and 10ms), which needs to be spliced into 80ms (divided into 1st, 2nd, 3rd,..., 8th 10ms, each 10ms corresponds to a 5G base station frame), 8 5G base station frames are required for the storage length of the entire common multiple frame, that is, the storage time is 80ms , A complete cycle is realized when all 8 5G base station frames are replaced.
  • N 16
  • Figure 9 the arrow in the figure lists 7 replacement corresponding positions, which correspond to the timing positions of the first base station identification frame to the fourth base station identification frame, and the 9th base station identification frame to the 11th base station identification.
  • the timing position of the frame In order to facilitate marking, "store the 1st frame”, “store the 2nd frame”, ...
  • the system frame number is the 0th frame), one frame in turn (8 replacements), the frame number continues to change (512th, 577th, 642, 707, 772, 837, 902, 967), Replace a frame in sequence (Note: At the time of the 968th frame of the base station, the frame numbers stored in the memory are the 512th, the 577th, the 642th, the 707th, the 772th, the 837th, the 902th, and the 967th.
  • the system frame number in the memory is the 512th frame).
  • the shielded device to be synchronized can be conveniently and efficiently obtained from the base station and other shielded devices at the time the stored frame sequence number changes.
  • the current progress of the base station can be judged at any time according to the change of the forwarded frame sequence number.
  • the synchronization timing can also be corrected according to the determined current progress of the base station.
  • FIG. 10 is a structural block diagram of a shielding system that executes the shielding method of the foregoing embodiment.
  • the shielding system includes a base station and multiple shielding devices, at least one of the base station and the multiple shielding devices is a synchronization reference device, and at least one of the multiple shielding devices is not synchronized with the synchronization reference device;
  • the shielding device includes a first acquisition module 100, a second acquisition module 200, a timing synchronization module 300, and a store-and-forward module 400. specifically:
  • the first acquiring module 100 is configured to receive the air signal in the shielded area, and acquire the frame signal sent by the synchronization reference device in multiple different frame periods.
  • the second acquisition module 200 is connected to the first acquisition module 100, and is configured to acquire the identification frame used for synchronization timing and the synchronization timing position corresponding to the identification frame among the multiple frame signals.
  • the timing synchronization module 300 is connected to the second acquisition module 200 and 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 is connected to the first acquisition module 100 and the timing synchronization module 300, and is configured to store the radio frequency signal of the base station frame at the storage timing position, and periodically forward the radio frequency signal to perform shielding work at the forwarding timing position of the store-and-forward cycle.
  • the shielding system provided in this embodiment includes a base station and multiple shielding devices. At least one of the base station and the multiple shielding devices is a synchronization reference device, and at least one of the multiple shielding devices is not synchronized with the synchronization reference device;
  • the device includes a first acquisition module, a second acquisition module, a timing synchronization module, and a store-and-forward module.
  • the first acquisition module and the second acquisition module acquire the identification frames used for timing synchronization from the frame signals sent by the synchronization reference device in different frame periods And the synchronization timing position, the timing synchronization module will obtain timing synchronization with the synchronization reference device, and then the store-and-forward module stores the base station frame in the storage timing position and forwards it periodically to perform shielding work.
  • the shielding system by selecting the equipment inside the system as the synchronization reference equipment, does not introduce external signals, which can save the material costs and maintenance costs of the additional installation of external equipment, and reduce costs; at the same time, through the first acquisition module and the second acquisition module
  • the acquisition of the identification frame and the synchronization timing position sent by the synchronization reference device enables the timing synchronization module to quickly and efficiently obtain timing synchronization, reducing the synchronization time and speeding up the storage and forwarding module to start the shielding work.
  • the shielding system can also be based on the identification frame and synchronization timing position Determine the current progress of the base station at any time.
  • FIG. 11 is a detailed structural diagram of the second acquisition module 200 in the embodiment shown in FIG. 10.
  • the second acquisition module 200 of this embodiment includes a first determination unit 201, a segmentation unit 202, a first setting unit 203, and a first position acquisition unit 204. specifically:
  • the first determining unit 201 is configured to determine that the frame signal is a base station frame if the frame sequence number change rule of the multiple frame signals matches the frame sequence number change rule of the base station.
  • the segmentation unit 202 is configured to segment the time sequence positions corresponding to multiple base station frames.
  • the first setting unit 203 is configured to set the base station frame corresponding to the preset timing position in each segment as an identification frame for timing synchronization.
  • the first position obtaining unit 204 is configured to obtain the synchronization timing position corresponding to the identification frame.
  • FIG. 12 is a detailed structural diagram of the second acquisition module 200 in the embodiment shown in FIG. 10.
  • the second acquiring module 200 of this embodiment includes a second determining unit 205, a second setting unit 206, and a second location acquiring unit 207. specifically:
  • the second determining unit 205 is configured to determine that the frame signal is a masked frame if the frame sequence number change rule of the multiple frame signals matches the frame sequence number change rule of the store-and-forward cycle.
  • the second setting unit 206 is configured to set the jump frame in the mask frame as an identification frame for timing synchronization.
  • the second position obtaining unit 207 is configured to obtain the synchronization timing position corresponding to the hopping frame.
  • FIG. 13 is a detailed structural diagram of the timing synchronization module 300 in the embodiment shown in FIG. 10.
  • the timing synchronization module 300 of this embodiment includes a first timing synchronization unit 301 and a second timing synchronization unit 302. specifically:
  • the first timing synchronization unit 301 is configured to, if the identified frame is a base station frame, align the storage timing position with the synchronization timing position clock to obtain timing synchronization with the synchronization reference device.
  • the second timing synchronization unit 302 is configured to, if the identification frame is a masked frame, align the forwarding timing position with the synchronization timing position clock to obtain timing synchronization with the synchronization reference device.
  • FIG. 14 is a structural block diagram of another shielding system that executes the shielding method of the foregoing embodiment on the basis of FIG. 10.
  • the shielding system includes a base station and multiple shielding devices, at least one of the base station and the multiple shielding devices is a synchronization reference device, and at least one of the multiple shielding devices is not synchronized with the synchronization reference device;
  • the shielding device includes a first acquisition module 100, a second acquisition module 200, a timing synchronization module 300, a store-and-forward module 400, a correction module 500, and a setting module 600. specifically:
  • the correction module 500 is respectively connected to the first acquisition module 100, the timing synchronization module 300, and the store-and-forward module 400, and is set to store base station frames in the storage timing position to obtain the main synchronization signal time of the base station frame; perform clock alignment according to the main synchronization signal time Fix. Through the correction module 500, the clock can be fine-tuned to obtain precise timing synchronization.
  • the setting module 600 is connected to the first acquiring module 100 and the store-and-forward module 400, and is configured to set the store-and-forward rule of the store-and-forward period according to the radio frequency band of the base station and the common frame period.
  • each module in the above-mentioned shielding system is only for illustration. In other embodiments, the shielding system can be divided into different modules as required to complete all or part of the functions of the above-mentioned shielding system.
  • An embodiment of the present application also provides an electronic device, including a memory and a processor, and a computer program is stored in the memory.
  • the processor is caused to execute the shielding method described in the above embodiment. step.
  • the embodiment of the present application also provides a computer-readable storage medium.
  • One or more non-volatile computer-readable storage media containing computer-executable instructions when the computer-executable instructions are executed by one or more processors, cause the processors to perform the steps of the shielding method in any of the above embodiments .
  • Non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory.
  • Volatile memory may include random access memory (RAM), which acts as external cache memory.
  • RAM is available in many 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), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
  • SRAM static RAM
  • DRAM dynamic RAM
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced SDRAM
  • SLDRAM synchronous Link (Synchlink) DRAM
  • Rambus direct RAM
  • DRAM direct memory bus dynamic RAM
  • RDRAM memory bus dynamic RAM

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

La présente invention concerne un procédé et un système de protection permettant d'obtenir une temporisation synchrone. Le procédé de protection consiste à : acquérir, à partir de signaux de trame envoyés par un appareil de référence de synchronisation au cours de différents cycles de trame, une trame d'identifiant pour une synchronisation de temporisation et une position de synchronisation de temporisation ; synchroniser la temporisation d'un appareil de protection destiné à être synchronisé avec la temporisation de l'appareil de référence de synchronisation en fonction de la trame d'identifiant et de la position de synchronisation de temporisation ; et stocker une trame de station de base à un emplacement de stockage de temporisation et la transférer de manière cyclique pour réaliser la protection. Dans le procédé et le système de protection, un appareil dans un système est sélectionné pour servir d'appareil de référence de synchronisation sans introduire de signaux externes, ce qui permet d'éliminer les coûts de matériau et les coûts de maintenance dus à l'installation d'un appareil externe. De plus, l'acquisition d'une trame d'identifiant et d'une position de synchronisation de temporisation envoyées par l'appareil de référence de synchronisation permet une synchronisation rapide et hautement efficace de la temporisation d'un appareil de protection subissant une synchronisation, réduit la quantité de temps nécessaire à la synchronisation, accélère l'activation d'une opération de protection et permet de vérifier une progression actuelle d'une station de base à tout moment en fonction de la trame d'identifiant et de la position de synchronisation de temporisation.
PCT/CN2020/087954 2019-09-27 2020-04-30 Procédé et système de protection permettant d'obtenir une temporisation synchrone WO2021057028A1 (fr)

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CN113824529A (zh) * 2021-08-30 2021-12-21 浙江三维通信科技有限公司 同步信号的分发方法、装置、系统以及信号屏蔽设备

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