CN111246561A - Synchronization method and device - Google Patents
Synchronization method and device Download PDFInfo
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- CN111246561A CN111246561A CN201811436570.XA CN201811436570A CN111246561A CN 111246561 A CN111246561 A CN 111246561A CN 201811436570 A CN201811436570 A CN 201811436570A CN 111246561 A CN111246561 A CN 111246561A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
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- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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Abstract
The embodiment of the invention provides a synchronization method and a synchronization device, wherein the method is applied to active positioning equipment, the active positioning equipment comprises individual soldier equipment and vehicle-mounted equipment, and the synchronization method comprises the following steps: the individual soldier equipment carries out cell search and determines the corresponding signal intensity of each cell, and the cells comprise public network cells and/or vehicle-mounted cells; determining a cell with the strongest signal strength, and receiving a downlink signal sent by the cell with the strongest signal strength; determining the current position of a cell with the strongest signal intensity corresponding to a master clock synchronization head according to the downlink signal; adjusting a local clock of the individual equipment in a mode that the current position approaches to the reference position so as to synchronize the individual equipment with the vehicle-mounted equipment; the reference position is the position of the vehicle-mounted equipment corresponding to the main clock synchronization head, which is determined for the first time after the individual soldier equipment is started. Therefore, whether the individual equipment is in the coverage range of the vehicle-mounted cell or not, the individual equipment can be synchronized with the vehicle-mounted equipment, and therefore the usability of the individual equipment is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a synchronization method and a synchronization apparatus.
Background
Currently, an active positioning device is generally used to find the position of a target mobile terminal, and the active positioning device includes: vehicle-mounted equipment and individual equipment; the process of positioning the position of the target mobile terminal is as follows: the vehicle-mounted device receives all nearby Mobile terminals (i.e. all Mobile terminals are accessed to the established cell) by establishing a cell of an FDD (Frequency Division Duplex) system or a cell of a TDD (Time Division Duplex) system, releases the Mobile terminals which do not need to be positioned to the public network according to the IMSI (International Mobile subscriber identity) of the Mobile terminals, and only allows the Mobile terminals (i.e. target Mobile terminals) which need to be positioned to be accessed to the established cell. The vehicle-mounted equipment can be used for carrying out primary positioning, determining the approximate position of the target mobile terminal (such as determining which floor of which building is located), and then enabling the portable individual soldier equipment to carry out accurate positioning. The vehicle-mounted equipment and the individual soldier equipment are positioned according to the signal intensity of the target mobile terminal.
Because the target mobile terminal and the vehicle-mounted equipment are synchronous, the signal intensity of the target mobile terminal can be determined only by the individual equipment and the vehicle-mounted equipment which are precisely synchronous; in the process of synchronizing the individual soldier equipment and the vehicle-mounted equipment, the vehicle-mounted equipment needs to send a synchronization signal to the individual soldier equipment, and then the individual soldier equipment is synchronized with the vehicle-mounted equipment according to the synchronization signal. When the existing method is adopted for synchronization, if the individual soldier equipment is in the signal coverage range of the cell established by the vehicle-mounted equipment, the individual soldier equipment can communicate with the vehicle-mounted equipment to realize synchronization, and as shown in figure 1, the individual soldier equipment 1 can be synchronized with the vehicle-mounted equipment; however, if the individual device moves out of the signal coverage range of the cell established by the vehicle-mounted device, the individual device cannot be synchronized with the vehicle-mounted device, as shown in fig. 1, the individual device 2 cannot be synchronized with the vehicle-mounted device. At the moment, signal acquisition errors of the target terminal can be caused, positioning failure is caused, and the usability of individual equipment is low.
Disclosure of Invention
The embodiment of the invention provides a synchronization method for improving the usability of individual equipment.
Correspondingly, the embodiment of the invention also provides a synchronization device for ensuring the realization and the application of the method.
In order to solve the above problems, the present invention discloses a synchronization method, which is applied to an active positioning device, wherein the active positioning device comprises an individual soldier device and a vehicle-mounted device, and the method comprises: the individual soldier equipment carries out cell search and determines the corresponding signal intensity of each cell, the cells comprise public network cells and/or vehicle-mounted cells, and the vehicle-mounted cells are cells created by the vehicle-mounted equipment; determining a cell with the strongest signal strength, and receiving a downlink signal sent by the cell with the strongest signal strength; determining the current position of the cell with the strongest signal intensity corresponding to the master clock synchronization head according to the downlink signal; adjusting a local clock of the individual equipment in a mode that the current position approaches to a reference position so as to enable the individual equipment and the vehicle-mounted equipment to be synchronous; and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started.
Optionally, the adjusting the local clock of the individual device in a manner that the current position approaches the reference position includes: judging whether the current position is the same as the reference position; if the current position and the reference position are different, determining the position deviation of the current position and the reference position; adjusting the voltage of the local clock of the individual soldier equipment corresponding to the crystal oscillator according to the position deviation; performing the step of performing cell search.
Optionally, the adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual device according to the position deviation includes: searching a mapping relation based on the position deviation, and determining a corresponding voltage deviation; and adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the voltage deviation.
Optionally, the vehicle-mounted cell is a TDD-system cell, and a position of a master clock synchronization head corresponding to the vehicle-mounted cell is the same as a position of a master clock synchronization head corresponding to a TDD-system public network cell with the strongest signal strength; the determining a position deviation of the current position from a reference position comprises: and calculating a difference value between the current position and the reference position, and taking the difference value as a position deviation.
Optionally, the vehicle-mounted cell is a Frequency Division Duplex (FDD) system cell, and the position of the main clock synchronization head corresponding to the vehicle-mounted cell is different from the position of the main clock synchronization head corresponding to the TDD system public network cell with the strongest signal intensity; the determining a position deviation of the current position from a reference position comprises: determining a middle reference position according to the reference position and the reference deviation; calculating a difference value between the current position and a middle reference position, and taking the difference value as a position deviation; and the reference deviation is the deviation between the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started, and the position of the master clock synchronization head corresponding to the TDD system cell with the strongest signal intensity.
Optionally, the method further comprises: and recording a voltage value of a local clock of the individual device corresponding to the voltage of the crystal oscillator, wherein the voltage value is used for configuring the voltage of the crystal oscillator in the starting process of the individual device.
The embodiment of the invention also provides a synchronizing device, which is applied to the active positioning equipment, wherein the active positioning equipment comprises individual soldier equipment and vehicle-mounted equipment, the device belongs to the individual soldier equipment, and the device comprises: the searching module is used for searching cells and determining the corresponding signal intensity of each cell, wherein the cells comprise public network cells and/or vehicle-mounted cells, and the vehicle-mounted cells are cells created by the vehicle-mounted equipment; the cell determining module is used for determining the cell with the strongest signal strength and receiving the downlink signal sent by the cell with the strongest signal strength; a position determining module, configured to determine, according to the downlink signal, a current position of a master clock synchronization header corresponding to the cell with the strongest signal strength; the clock adjusting module is used for adjusting the local clock of the individual device in a mode that the current position approaches the reference position so as to enable the individual device to be synchronous with the vehicle-mounted device; and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started.
Optionally, the cell with the strongest signal strength is a time division duplex TDD cell, and the clock adjusting module includes: the judgment submodule is used for judging whether the current position is the same as the reference position or not; the deviation determining submodule is used for determining the position deviation of the current position and the reference position if the current position and the reference position are different; the voltage adjusting submodule is used for adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the position deviation; and the searching module is used for searching a cell after the step of adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the position deviation.
Optionally, the voltage adjusting sub-module is configured to find a mapping relationship based on the position deviation, and determine a corresponding voltage deviation; and adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the voltage deviation.
Optionally, the vehicle-mounted cell is a TDD-system cell, and a position of a master clock synchronization head corresponding to the vehicle-mounted cell is the same as a position of a master clock synchronization head corresponding to a TDD-system public network cell with the strongest signal strength; and the deviation determining submodule is used for calculating the difference value between the current position and the reference position, and taking the difference value as the position deviation.
Optionally, the vehicle-mounted cell is a Frequency Division Duplex (FDD) system cell, and the position of the main clock synchronization head corresponding to the vehicle-mounted cell is different from the position of the main clock synchronization head corresponding to the TDD system public network cell with the strongest signal intensity; the deviation determining submodule is used for determining a middle reference position according to the reference position and the reference deviation; calculating a difference value between the current position and a middle reference position, and taking the difference value as a position deviation; and the reference deviation is the deviation between the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started, and the position of the master clock synchronization head corresponding to the TDD system cell with the strongest signal intensity.
Optionally, the apparatus further comprises: and the voltage recording module is used for recording a voltage value of a crystal oscillator voltage corresponding to the local clock of the individual device, wherein the voltage value is used for configuring the voltage of the crystal oscillator in the starting process of the individual device.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, the individual soldier equipment carries out cell search in the process of synchronizing with the vehicle-mounted equipment each time, and the signal intensity of each cell is determined; then, determining a cell with the strongest signal strength, receiving a downlink signal sent by the cell with the strongest signal strength, and further determining the current position of the cell with the strongest signal strength corresponding to the master clock synchronization head according to the downlink signal; adjusting the local clock of the individual equipment in a mode that the current position approaches the reference position, so that the local clock of the individual equipment is synchronous with the master clock of the vehicle-mounted equipment; and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started. Because the cell searched by the individual soldier equipment comprises the public network cell and/or the vehicle-mounted cell, the individual soldier equipment can be synchronized with the vehicle-mounted equipment no matter whether the individual soldier equipment is in the coverage range of the vehicle-mounted cell or not, and therefore the usability of the individual soldier equipment is improved.
Drawings
FIG. 1 is a schematic diagram of a positioning method of an active positioning apparatus in the prior art;
FIG. 2 is a flow chart of the steps of one embodiment of a synchronization method of the present invention;
FIG. 3 is a flow chart of the steps of an alternative embodiment of a synchronization method of the present invention;
FIG. 4 is a block diagram of a synchronization apparatus according to an embodiment of the present invention;
fig. 5 is a block diagram of an alternative embodiment of a synchronization apparatus of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In the prior art, individual equipment is synchronized according to a synchronization signal sent by vehicle-mounted equipment, and when the individual equipment is outside a coverage area of a vehicle-mounted cell, the individual equipment cannot be synchronized with the vehicle-mounted equipment, so that the individual equipment cannot position a target mobile terminal (a mobile terminal needing positioning), and the availability of the individual equipment is low; therefore, the embodiment of the present invention provides a synchronization method to solve the above problems; the method comprises the following specific steps:
because the coverage area of the public network cell (which can be a cell created by a base station) is relatively comprehensive, and the clock of the vehicle-mounted cell and the clock of the public network cell are synchronous or have fixed deviation, the movement of the individual soldier equipment in the embodiment of the invention can be synchronous with the vehicle-mounted equipment by means of the clock of the public network cell, and further can be synchronous with the vehicle-mounted equipment when the individual soldier equipment moves out of the coverage area of the vehicle-mounted cell, so that the problem that the individual soldier equipment cannot be synchronous when moving out of the coverage area of the vehicle-mounted cell is solved, and the usability of the individual soldier equipment is improved.
In the embodiment of the invention, the individual equipment can be periodically synchronized with the vehicle-mounted equipment, and the synchronization period can be set as required. The following description will be made of the implementation of synchronization between individual soldier equipment and vehicle-mounted equipment by taking primary synchronization as an example.
Referring to fig. 2, a flowchart illustrating steps of an embodiment of a synchronization method of the present invention is shown, which may specifically include the following steps:
Step 202, determining the cell with the strongest signal strength, and receiving the downlink signal sent by the cell with the strongest signal strength.
In the embodiment of the invention, the individual soldier equipment can search the cells in each synchronization process, and the area where the individual soldier equipment is located can receive the signals of the cells; for example, when the individual device is in a signal coverage range of the vehicle-mounted cell, the cell searched by the individual device may include the public network cell and the vehicle-mounted cell; when the individual equipment is out of the coverage range of the vehicle-mounted cell, the cell searched by the individual equipment only comprises a public network cell. In each searching process, the individual soldier equipment can determine the signal strength corresponding to each searched cell, and then the clock of the cell with the strongest signal strength is used as a master clock; synchronizing with the vehicle-mounted equipment according to the master clock; thereby improving the reliability of clock synchronization.
Step 204, adjusting a local clock of the individual equipment in a mode that the current position approaches to a reference position so as to enable the individual equipment and the vehicle-mounted equipment to be synchronous; and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is acquired for the first time after the individual soldier equipment is started.
In the embodiment of the invention, the individual soldier equipment can be synchronized with the vehicle-mounted equipment by comparing the current position and the reference position of the main clock synchronization head; the reference position may refer to a position of the on-board device corresponding to the master clock synchronization head, which is determined for the first time after each individual device is started. The local clock of the individual device can be adjusted in a mode that the current position continuously approaches the reference position, so that the local clock of the individual device is synchronous with the master clock of the vehicle-mounted device; for example, first, whether the current position is the same as the reference position is judged, and if not, the local clock is adjusted; after the local clock is adjusted every time, the current position of the main clock synchronization head corresponding to the cell with the strongest signal intensity can be determined again; executing the above judgment again; if the current position is the same as the reference position, the local clock and the master clock may be considered to be synchronized, and the adjustment of the local clock may be stopped at this time. In the embodiment of the invention, no matter the cell is a public network cell or a vehicle-mounted cell, a synchronization sequence is carried in a downlink signal; therefore, after the individual device determines the cell with the strongest signal strength, the individual device can receive the downlink signal sent by the cell with the strongest signal strength, and then can determine the current position of the cell with the strongest signal strength corresponding to the master clock synchronization head by solving the synchronization sequence in the downlink signal.
In the embodiment of the invention, the individual soldier equipment carries out cell search in the process of synchronizing with the vehicle-mounted equipment each time, and the signal intensity of each cell is determined; then, determining a cell with the strongest signal strength, receiving a downlink signal sent by the cell with the strongest signal strength, and further determining the current position of the cell with the strongest signal strength corresponding to the master clock synchronization head according to the downlink signal; adjusting the local clock of the individual equipment in a mode that the current position approaches the reference position, so that the local clock of the individual equipment is synchronous with the master clock of the vehicle-mounted equipment; and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started. Because the cell searched by the individual soldier equipment comprises the public network cell and/or the vehicle-mounted cell, the individual soldier equipment can be synchronized with the vehicle-mounted equipment no matter whether the individual soldier equipment is in the coverage range of the vehicle-mounted cell or not, and therefore the usability of the individual soldier equipment is improved.
The time for transmitting the downlink signal by all the cells of the TDD system is synchronous, while the time for transmitting the downlink signal by the cells of different FDD systems is asynchronous, but the clock of each cell of the FDD system has fixed deviation with the clock of the cell of the TDD system; therefore, the individual soldier equipment of the embodiment of the invention can realize the synchronization with the vehicle-mounted equipment based on the synchronous clock of the cell of the TDD system; and the cell with the strongest signal strength may be a cell of a TDD scheme.
Therefore, if the vehicle-mounted cell is a cell of a TDD system, since downlink signals transmitted by the cell of the TDD system are synchronized, in the synchronization process, the local clock of the individual device can be adjusted in a manner that the position of the master clock head corresponding to the cell with the strongest signal strength approaches the reference position of the master clock synchronization head, so that synchronization can be achieved. If the vehicle-mounted cell is a cell of an FDD (frequency division duplex) system, because the time for transmitting the downlink signal by the cell of the TDD system with the strongest signal intensity is asynchronous while the time for transmitting the downlink signal by the cell of the different FDD systems is asynchronous, each cell of the FDD system has fixed deviation with the cell of the TDD system; therefore, after the individual soldier equipment is started, after the position of the vehicle-mounted equipment corresponding to the master clock synchronization head is determined for the first time, the position of the vehicle-mounted equipment corresponding to the master clock synchronization head can also be determined, and the reference deviation of the master clock synchronization head of the TDD system cell with the strongest signal strength, namely the fixed deviation between the two, is determined at the moment. In the subsequent synchronization process, the reference position can be adjusted according to the reference deviation, and then the synchronization is realized by adopting the mode that the current position continuously approaches the adjusted reference position.
Referring to fig. 3, a flowchart illustrating steps of an alternative embodiment of the synchronization method of the present invention is shown, which may specifically include the following steps:
Step 302, determining the cell with the strongest signal strength, and receiving the downlink signal sent by the cell with the strongest signal strength.
In the embodiment of the invention, if the vehicle-mounted cell is a cell of a TDD system, the target mobile terminal correspondingly accessed to the vehicle-mounted cell is also of the TDD system, so that individual equipment can acquire a signal of the target mobile terminal by adopting the TDD system, determine the signal intensity of the target mobile terminal and further realize the positioning of the target mobile terminal; at the moment, when the individual equipment is synchronized each time, the cell can be searched in the system. If the vehicle-mounted cell is an FDD cell, the target mobile terminal correspondingly accessed to the vehicle-mounted cell is also in an FDD mode, so that the individual soldier equipment can acquire the signal of the target mobile terminal in an FDD mode, determine the signal intensity of the target mobile terminal and further realize the positioning of the target mobile terminal; at the moment, when the individual soldier equipment is synchronized each time, the FDD mode can be switched to the TDD mode, then cell search is carried out, and when the individual soldier equipment is synchronized with the vehicle-mounted equipment, the FDD mode is switched to receive the target mobile terminal signal. The signal intensity corresponding to each cell can be determined by the individual equipment in the process of searching the cell; and then, the cell with the strongest signal strength in the TDD system can be determined, and the downlink signal sent by the cell with the strongest signal strength in the TDD system can be received.
Step 303, determining the current position of the master clock synchronization head corresponding to the cell with the strongest signal strength according to the downlink signal.
In the embodiment of the invention, the downlink signal issued by the TDD system cell with the strongest signal strength carries the synchronization sequence, and the individual device can determine the position of the synchronization head of the master clock by solving the synchronization sequence in the downlink signal; the individual device can store the received downlink signal in a local cache, and then select a segment of data at fixed length intervals (such as one chip) from the local cache to perform correlation operation with a local sequence stored locally. If the result of the correlation operation is matched with the preset result, determining that the selected data is a synchronous sequence, and taking the position of the head of the synchronous sequence as the position of the synchronous head of the main clock; and if the result of the correlation operation is not matched with the preset result, determining that the selected data is an asynchronous sequence, and selecting the next section of data to perform the correlation operation.
After the master clock synchronization head position of the TDD system cell with the strongest signal strength is determined, the local clock of the individual device can be adjusted in a mode that the current position approaches to the reference position; the method comprises the following specific steps:
and step 304, judging whether the current position is the same as the reference position.
In the embodiment of the invention, whether the current position is the same as the reference position can be judged; if the current position is the same as the reference position, the individual device and the vehicle-mounted device can be determined to be synchronous, and at the moment, the local clock of the individual device does not need to be adjusted; the flow may end. If the current position is different from the reference position, the individual device and the vehicle-mounted device can be determined to be asynchronous, and the local clock of the individual device can be adjusted at the moment so as to enable the individual device and the vehicle-mounted device to be synchronous; step 305 may be performed.
In the embodiment of the invention, the position deviation between the current position and the reference position can be determined, and the local clock of the individual soldier equipment is adjusted according to the position deviation; wherein the position deviation may be a rational number, and may include: 0. positive and negative numbers.
If the vehicle-mounted cell is a TDD system cell, a difference between the current position and the reference position may be calculated, and the difference is used as a position deviation.
If the vehicle-mounted cell is an FDD-type cell, the step of determining the position deviation between the current position and the reference position may include the following substeps:
substep 1, determining a middle reference position according to the reference position and the reference deviation;
substep 2, calculating a difference value between the current position and a middle reference position, and taking the difference value as a position deviation; and the reference deviation is the deviation between the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started, and the position of the master clock synchronization head corresponding to the TDD system cell with the strongest signal intensity. Wherein the reference deviation may also be a rational number.
And step 306, adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual device according to the position deviation.
In the embodiment of the present invention, a mapping relationship between a position deviation and a voltage deviation may be pre-established, where the voltage deviation may also be a rational number; for example, (positional deviation 2) corresponds to (voltage deviation +0.02 v); further, a mapping relation can be searched based on the position deviation, and a corresponding voltage deviation is determined; and adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the voltage deviation. After the voltage of the crystal oscillator is adjusted according to the voltage deviation corresponding to the position deviation, a local clock generated by the crystal oscillator and a master clock of a cell with the strongest cell signal intensity may not be synchronous; therefore, after adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual device each time, the individual device may perform step 301 to step 305 again, and determine whether the local clock is synchronized with the master clock of the cell with the strongest signal strength according to the calculated position deviation.
In the embodiment of the invention, after the crystal oscillator voltage is adjusted, the voltage value of the local clock of the individual soldier equipment corresponding to the crystal oscillator voltage is recorded; and the voltage value is used for configuring the voltage of the crystal oscillator in the starting process of the individual soldier equipment. And then in the starting process of the individual device, the voltage of the crystal oscillator can be configured according to the latest voltage value.
In the embodiment of the invention, the individual soldier equipment carries out cell search in the process of synchronizing with the vehicle-mounted equipment each time, and the signal intensity of each cell is determined; then, determining a cell with the strongest signal strength, receiving a downlink signal sent by the cell with the strongest signal strength, and further determining the current position of the cell with the strongest signal strength corresponding to the master clock synchronization head according to the downlink signal; adjusting the local clock of the individual equipment in a mode that the current position approaches the reference position, so that the local clock of the individual equipment is synchronous with the master clock of the vehicle-mounted equipment; and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started. Because the cell searched by the individual soldier equipment comprises the public network cell and/or the vehicle-mounted cell, the individual soldier equipment can be synchronized with the vehicle-mounted equipment no matter whether the individual soldier equipment is in the coverage range of the vehicle-mounted cell or not, and therefore the usability of the individual soldier equipment is improved.
Secondly, in the embodiment of the invention, if the vehicle-mounted cell is a TDD system cell, the difference value between the current position and the reference position can be calculated, and the difference value is taken as the position deviation; if the vehicle-mounted cell is an FDD cell, determining a middle reference position according to the reference position and the reference deviation; and calculating the difference value of the current position and the middle reference position, and taking the difference value as the position deviation. Therefore, synchronization can be carried out on vehicle-mounted cells of different systems, and the universality of individual equipment is improved.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
The embodiment of the invention also provides a synchronizing device which is applied to the active positioning equipment, wherein the active positioning equipment comprises individual soldier equipment and vehicle-mounted equipment, and the device belongs to the individual soldier equipment.
Referring to fig. 4, a block diagram of a synchronization apparatus according to an embodiment of the present invention is shown, which may specifically include the following modules:
a searching module 401, configured to perform cell search and determine a signal strength corresponding to each cell, where the cell includes a public network cell and/or a vehicle-mounted cell, and the vehicle-mounted cell is a cell created by the vehicle-mounted device;
a cell determining module 402, configured to determine a cell with the strongest signal strength, and receive a downlink signal sent by the cell with the strongest signal strength;
a position determining module 403, configured to determine, according to the downlink signal, a current position of a master clock synchronization header corresponding to the cell with the strongest signal strength;
a clock adjusting module 404, configured to adjust a local clock of the individual device in a manner that the current position approaches the reference position, so that the individual device is synchronized with the vehicle-mounted device;
and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started.
Referring to fig. 5, a block diagram of a synchronization apparatus according to an embodiment of the present invention is shown, which may specifically include the following modules:
in an optional embodiment of the present invention, the clock adjusting module 404 includes:
a judging submodule 4041, configured to judge whether the current position is the same as the reference position;
a deviation determining submodule 4042, configured to determine, if the current position and the reference position are different, a position deviation between the current position and the reference position;
the voltage adjusting submodule 4043 is used for adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the position deviation;
the searching module 401 is configured to perform cell search after the step of adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual device according to the position deviation.
In an optional embodiment of the present invention, the voltage adjusting sub-module 4043 is configured to find a mapping relationship based on the position deviation, and determine a corresponding voltage deviation; and adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the voltage deviation.
In an optional embodiment of the present invention, the vehicle-mounted cell is a TDD-system cell, and a position of a master clock synchronization head corresponding to the vehicle-mounted cell is the same as a position of a master clock synchronization head corresponding to a TDD-system public network cell with a strongest signal strength; the deviation determining submodule 4042 is configured to calculate a difference between the current position and a reference position, and use the difference as a position deviation.
In an optional embodiment of the present invention, the vehicle-mounted cell is a frequency division duplex FDD system cell, and the position of the master clock synchronization head corresponding to the vehicle-mounted cell is different from the position of the master clock synchronization head corresponding to the TDD system public network cell with the strongest signal strength; the deviation determining submodule 4042 is configured to determine an intermediate reference position according to the reference position and the reference deviation; calculating a difference value between the current position and a middle reference position, and taking the difference value as a position deviation; and the reference deviation is the deviation between the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started, and the position of the master clock synchronization head corresponding to the TDD system cell with the strongest signal intensity.
In an optional embodiment of the present invention, the apparatus further comprises: and the voltage recording module 405 is configured to record a voltage value of the crystal oscillator voltage corresponding to the local clock of the individual device, where the voltage value is used for configuring the voltage of the crystal oscillator in the starting process of the individual device.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above detailed description of the synchronization method and the synchronization apparatus provided by the present invention, and the specific examples applied herein have been provided to explain the principles and embodiments of the present invention, and the above descriptions of the embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (12)
1. A synchronization method is applied to an active positioning device, wherein the active positioning device comprises individual soldier equipment and vehicle-mounted equipment, and the method comprises the following steps:
the individual soldier equipment carries out cell search and determines the corresponding signal intensity of each cell, the cells comprise public network cells and/or vehicle-mounted cells, and the vehicle-mounted cells are cells created by the vehicle-mounted equipment;
determining a cell with the strongest signal strength, and receiving a downlink signal sent by the cell with the strongest signal strength;
determining the current position of the cell with the strongest signal intensity corresponding to the master clock synchronization head according to the downlink signal;
adjusting a local clock of the individual equipment in a mode that the current position approaches to a reference position so as to enable the individual equipment and the vehicle-mounted equipment to be synchronous;
and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started.
2. The method according to claim 1, wherein the cell with the strongest signal strength is a Time Division Duplex (TDD) standard cell, and the adjusting the local clock of the individual device by adopting the manner that the current position approaches the reference position comprises:
judging whether the current position is the same as the reference position;
if the current position and the reference position are different, determining the position deviation of the current position and the reference position;
adjusting the voltage of the local clock of the individual soldier equipment corresponding to the crystal oscillator according to the position deviation;
performing the step of performing cell search.
3. The method of claim 2, wherein the adjusting the voltage of the local clock corresponding crystal oscillator of the individual device according to the position deviation comprises:
searching a mapping relation based on the position deviation, and determining a corresponding voltage deviation;
and adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the voltage deviation.
4. The method according to claim 2, wherein the vehicular cell is a TDD-system cell, and a position of a master clock synchronization header corresponding to the vehicular cell is the same as a position of a master clock synchronization header corresponding to a TDD-system public network cell with a strongest signal strength;
the determining a position deviation of the current position from a reference position comprises:
and calculating a difference value between the current position and the reference position, and taking the difference value as a position deviation.
5. The method according to claim 2, wherein the vehicular cell is a frequency division duplex FDD system cell, and the position of the primary clock synchronization head corresponding to the vehicular cell is different from the position of the primary clock synchronization head corresponding to the TDD system public network cell with the strongest signal strength;
the determining a position deviation of the current position from a reference position comprises:
determining a middle reference position according to the reference position and the reference deviation;
calculating a difference value between the current position and a middle reference position, and taking the difference value as a position deviation;
and the reference deviation is the deviation between the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started, and the position of the master clock synchronization head corresponding to the TDD system cell with the strongest signal intensity.
6. The method of claim 1, further comprising:
and recording a voltage value of a local clock of the individual device corresponding to the voltage of the crystal oscillator, wherein the voltage value is used for configuring the voltage of the crystal oscillator in the starting process of the individual device.
7. A synchronizer is characterized in that the synchronizer is applied to active positioning equipment, the active positioning equipment comprises individual soldier equipment and vehicle-mounted equipment, the synchronizer belongs to the individual soldier equipment, and the synchronizer comprises:
the searching module is used for searching cells and determining the corresponding signal intensity of each cell, wherein the cells comprise public network cells and/or vehicle-mounted cells, and the vehicle-mounted cells are cells created by the vehicle-mounted equipment;
the cell determining module is used for determining the cell with the strongest signal strength and receiving the downlink signal sent by the cell with the strongest signal strength;
a position determining module, configured to determine, according to the downlink signal, a current position of a master clock synchronization header corresponding to the cell with the strongest signal strength;
the clock adjusting module is used for adjusting the local clock of the individual device in a mode that the current position approaches the reference position so as to enable the individual device to be synchronous with the vehicle-mounted device;
and the reference position is the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started.
8. The apparatus of claim 7, wherein the cell with the strongest signal strength is a Time Division Duplex (TDD) cell, and the clock adjustment module comprises:
the judgment submodule is used for judging whether the current position is the same as the reference position or not;
the deviation determining submodule is used for determining the position deviation of the current position and the reference position if the current position and the reference position are different;
the voltage adjusting submodule is used for adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the position deviation;
and the searching module is used for searching a cell after the step of adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the position deviation.
9. The apparatus of claim 8,
the voltage adjusting submodule is used for searching a mapping relation based on the position deviation and determining a corresponding voltage deviation; and adjusting the voltage of the crystal oscillator corresponding to the local clock of the individual soldier equipment according to the voltage deviation.
10. The apparatus according to claim 8, wherein the vehicular cell is a TDD-system cell, and a position of a master clock synchronization header corresponding to the vehicular cell is the same as a position of a master clock synchronization header corresponding to a TDD-system public network cell with a strongest signal strength;
and the deviation determining submodule is used for calculating the difference value between the current position and the reference position, and taking the difference value as the position deviation.
11. The apparatus according to claim 8, wherein the vehicular cell is a frequency division duplex FDD system cell, and the position of the primary clock synchronization header corresponding to the vehicular cell is different from the position of the primary clock synchronization header corresponding to the TDD system public network cell with the strongest signal strength;
the deviation determining submodule is used for determining a middle reference position according to the reference position and the reference deviation; calculating a difference value between the current position and a middle reference position, and taking the difference value as a position deviation; and the reference deviation is the deviation between the position of the vehicle-mounted equipment corresponding to the master clock synchronization head, which is determined for the first time after the individual soldier equipment is started, and the position of the master clock synchronization head corresponding to the TDD system cell with the strongest signal intensity.
12. The apparatus of claim 7, further comprising:
and the voltage recording module is used for recording a voltage value of a crystal oscillator voltage corresponding to the local clock of the individual device, wherein the voltage value is used for configuring the voltage of the crystal oscillator in the starting process of the individual device.
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