WO2025252151A1 - 信号同步方法及对讲机 - Google Patents

信号同步方法及对讲机

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Publication number
WO2025252151A1
WO2025252151A1 PCT/CN2025/099281 CN2025099281W WO2025252151A1 WO 2025252151 A1 WO2025252151 A1 WO 2025252151A1 CN 2025099281 W CN2025099281 W CN 2025099281W WO 2025252151 A1 WO2025252151 A1 WO 2025252151A1
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WIPO (PCT)
Prior art keywords
time
information
transmission
launch
duration
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PCT/CN2025/099281
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English (en)
French (fr)
Inventor
秦瑞伦
齐靖南
李世亮
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Hytera Communications Corp Ltd
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Hytera Communications Corp Ltd
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Publication of WO2025252151A1 publication Critical patent/WO2025252151A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/24—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
    • H04Q5/245—Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase

Definitions

  • This application relates to the field of signal synchronization technology, and more specifically, to a signal synchronization method and a walkie-talkie.
  • Wireless ad hoc networks are temporary, multi-hop autonomous systems composed of a group of mobile nodes equipped with wireless transceivers. They do not rely on pre-set infrastructure and have the characteristics of temporary networking, rapid deployment, no control center, and strong survivability. They have broad application prospects in both military and civilian fields and are a hot topic in network research.
  • ad hoc networks inevitably involve multiple routes; there may be multiple transmission paths from the initiating device to a receiving device. If a signal reaches the receiving device through different paths, the different distances between devices result in different paths for the multiple signals to be forwarded in the ad hoc network. These path differences can easily cause phase differences between multiple signals. If the phase difference exceeds a certain range, demodulation becomes difficult.
  • This application provides a signal synchronization method and a walkie-talkie to solve the aforementioned technical problems existing in related technologies.
  • a signal synchronization method comprising: preparing to transmit first information according to transmission requirements; transmitting the first information at a predetermined transmission time point closest to the expected transmission time in absolute time; the predetermined transmission time point being a plurality of fixed points among the values of a unit time in absolute time, the duration between any two consecutive fixed points being a phase alignment duration; the phase alignment duration being less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network; wherein the unit time is consistent with the time unit of the phase alignment duration.
  • a signal synchronization device comprising: a generation module, a calculation module, and a transmission module, wherein the generation module is used to generate first information to be transmitted;
  • the calculation module is used to calculate the transmission time of the first information, which is a predetermined transmission time that is closest to the current time in absolute time.
  • the predetermined transmission time is a plurality of fixed points among the values of a unit time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration.
  • the phase alignment duration is less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network.
  • the unit time is consistent with the time unit of the phase alignment duration.
  • the transmitting module transmits the first information at the transmission time of the first information.
  • a computer storage medium is also provided, wherein a computer program is stored in the computer storage medium, and the computer program is configured to execute the steps in any of the above-described apparatus embodiments when it is run.
  • a walkie-talkie including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; wherein: the memory is used to store computer programs; and the processor is used to execute the steps in the above method by running the programs stored in the memory.
  • a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to perform the steps in the above-described method.
  • the local node communication device receives the second signal transmitted by the previous hop node communication device, obtains the reception time of the second signal, and acquires the phase alignment duration within the communication system. Based on the reception time and the phase alignment duration, the local device determines the target transmission time for transmitting the first signal to the next hop node communication device. By setting the transmission time of the device through the specified phase alignment duration, each node communication device transmits signals at a specific time, ensuring the synchronization of the transmitted signals of each device, thereby reducing signal transmission delay.
  • Figure 1 is a hardware structure block diagram of a computer according to an embodiment of this application.
  • FIG. 2 is a flowchart of a signal synchronization method according to an embodiment of this application.
  • FIG. 3 is a schematic diagram of the transmission times of each node device in the embodiments of this application.
  • Figure 4 is a schematic diagram of a flooding self-organizing network system based on the PDT/DMR protocol according to an embodiment of this application;
  • Figure 5 is a schematic diagram of the transmission times of each node device in the existing synchronization scheme
  • Figure 6 is a structural block diagram of a signal synchronization device according to an embodiment of this application.
  • FIG1 is a hardware structure block diagram of a walkie-talkie according to an embodiment of this application.
  • the walkie-talkie may include one or more (only one is shown in FIG1) processors 102 (processor 102 may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data.
  • the walkie-talkie may also include a transmission device 106 for communication functions and an input/output device 108.
  • the structure shown in FIG1 is only illustrative and does not limit the structure of the computer described above.
  • the computer may also include more or fewer components than shown in FIG1, or have a different configuration than shown in FIG1.
  • the memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to a signal synchronization method in this embodiment.
  • the processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thus implementing the above-described method.
  • the memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory.
  • the transmission device 106 is used to receive or send data via a network.
  • Specific examples of the network described above may include a wireless network provided by a telecommunications provider.
  • the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet.
  • the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with other communication devices.
  • NIC Network Interface Controller
  • RF Radio Frequency
  • Figure 5 is a schematic diagram of the synchronization of the transmission times of various node devices in an existing synchronization scheme
  • the absolute time of the satellite positioning system is used as the basis:
  • the first device will start transmitting wireless signals at 0ms.
  • the signal transmission time from the initial device to devices a and A is the same. Dividing the distance by the speed of light, the signal transmission time is calculated to be 0.067ms. Therefore, the start time for devices a and A to receive the signal is 0.067ms.
  • this embodiment uses a PDT/DMR (Police Digital Trunking) system (DMR, Digital Mobile Radio) as an example.
  • a unit time slot is 30ms
  • the forwarding rule is that if a signal is received in the previous time slot, it is transmitted in the next time slot. For example, receiving from 0 to 30ms, transmitting from 30 to 60ms, receiving from 60 to 90ms, and so on.
  • Figure 4 shows a flooding self-organizing network system based on the PDT/DMR (narrowband 2-slot TDMA system, 30ms per time slot, 4FSK modulation, symbol rate 4.8kbps) protocol.
  • the system adopts a follower-type synchronization method, meaning that each device determines the phase and time slot of its own transmitted signal based on the phase and time slot of the received signal.
  • the distance between device A and device B is 40km.
  • the signal transmission time from device A to device B is 0.133ms, meaning the signal forwarded by device A takes 0.133ms to reach device B.
  • the distance between device A and device B is 20km.
  • the signal transmission time from device A to device B is 0.067ms, meaning the signal forwarded by device A takes 0.067ms to reach device B.
  • the distance between the receiving device and device B is 20km.
  • the distance between the receiving device and device B is 20km.
  • the signal time difference between the signals transmitted by device B and device B when they arrive at the receiving device is 0.
  • the PDT symbol period is 0.208ms, while the phase difference is close to 1/3 of a symbol.
  • the receiving device will not be able to demodulate the signal correctly, leading to communication failure. If one signal is significantly stronger than the other, it means that the weaker signal is just a small noise and will not affect signal demodulation. However, if the strengths of the two signals are not significantly different ( ⁇ 10dB), and the delays and phases of the two signals are different, there is an overlapping effect between the different signals, which makes it impossible for the receiving device to distinguish them and demodulate the signal correctly.
  • FIG. 2 is a flowchart of a signal synchronization method according to an embodiment of this application. As shown in Figure 2, the process includes the following steps:
  • Step S10 Prepare the first launch information according to the launch requirements
  • Step S20 Transmit the first information at the nearest predetermined transmission time point before the expected transmission time in absolute time; the predetermined transmission time point is one of multiple fixed points among the values of unit time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration; the phase alignment duration is less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network; wherein, the unit time is consistent with the time unit of the phase alignment duration.
  • the absolute time is the absolute time obtained by the current communication node, and it uses the same time standard as the absolute times obtained by other communication nodes, such as Greenwich Mean Time.
  • the acquisition methods include, but are not limited to: obtaining absolute time via GPS, obtaining absolute time via Wi-Fi or wireless networks (e.g., obtaining time from an Internet NTP server).
  • the transmission time points are defined as multiple fixed points within a unit of time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration.
  • the unit of time is, for example, milliseconds (ms) or microseconds ( ⁇ s).
  • the minimum unit of time is 1000 ⁇ s
  • the phase alignment duration is 500 ⁇ s
  • the fixed transmission time points are 0 ⁇ s and 500 ⁇ s.
  • the phase alignment time should be greater than or equal to the average transmission delay in the wireless ad hoc network. This can solve most of the delay problems and ensure network synchronization.
  • the estimated transmission time of the intermediate node is: the transmission time slot time.
  • the transmission time slot time is the estimated transmission time in the existing synchronization scheme described above.
  • the estimated transmission time is adjusted, and the adjusted transmission time is the nearest specified time point before the transmission time slot time.
  • the nearest specified time point includes specified time points that are the same as the transmission time slot time. When there are identical specified time points, those identical specified time points are used as the nearest specified time point.
  • the estimated transmission time slot time of intermediate node b is 60.2ms. Therefore, the first information is transmitted at the nearest specified time point of 60ms before this transmission time slot time of 60.2ms, thus eliminating the delay by transmitting ahead of schedule at the specified transmission time point.
  • the transmitted signal is not completely phase-aligned with the received signal.
  • a series of transmission time points are specified for the communication nodes.
  • the communication nodes transmit signals at the specified times, so that each intermediate communication node can eliminate the delay of the transmission signal of the previous hop communication node, ensuring the synchronization of the transmission signals of each communication node, thereby reducing signal transmission delay. It can also solve the problem that in multi-path transmission, the difference in path can easily cause phase difference of multiple signals. If the phase difference exceeds a certain range, demodulation will be difficult.
  • the execution node is the initiating node, and the method further includes:
  • Step A Receive the triggered transmission request and generate first information based on the transmission request
  • Step B When transmitting the first information, transmit the first information at a predetermined transmission time point that is closest to the current time in absolute time.
  • the communication node When the communication node is the originating node, its estimated transmission time is the current time when it is ready to transmit.
  • the current time refers to the time when the originating node meets the conditions for transmitting the first information, at which point the terminal can immediately transmit the first information.
  • the transmission request can be triggered by an external interface, such as a walkie-talkie's PTT button, keyboard, or voice command.
  • the originating node receives the transmission request triggered by the external interface, generates the first information according to the transmission request, and transmits the first information at the nearest specified transmission time point after the current time in absolute time. That is, the communication device may delay for a certain period after being ready to transmit, and then transmits at the specified transmission time point.
  • the originating node can theoretically launch at any time, and it is also feasible to uniformly reduce the delay starting from the second node.
  • the originating node also follows the rule of launching at the specified time point to achieve more precise launch synchronization, then the current time is adjusted, and the adjusted launch time is the closest specified launch time point after the current time. The originating node then launches with a delay to ensure that it launches at the specified time point.
  • preparing the first launch information according to the launch requirements includes:
  • the communication node receives the second information sent by the previous communication node and obtains the reception time of the second information; the second information is sent by the previous communication node at a predetermined transmission time point in absolute time;
  • the communication node receives the second information sent by the previous communication node, obtains the reception time of the second information, and synchronizes with the second information.
  • the reception time can be either the start time or the end time of receiving the second information.
  • a first information is generated, and a transmission time slot for transmitting the first information is determined.
  • This transmission time slot is based on the terminal's preset forwarding rules, and can, for example, be the first, second, or third subsequent time slots for data forwarding.
  • the second information is sent by the previous communication node at a predetermined transmission time point in absolute time.
  • the second information is sent by the originating node at a predetermined transmission time point in absolute time, or the second information is transmitted by the originating node at any time.
  • transmitting the first information at the nearest predetermined launch time point before the expected launch time in absolute time includes:
  • the start time of receiving the second information is T1
  • the unit time slot time is t0 (e.g., 30ms)
  • the transmission time slot of the first information is the second time slot in the next transmission cycle (one cycle is 2 time slots) of the current receiving time slot (i.e., after 3 time slots).
  • the expected transmission time of the first information T1 + 3*t0.
  • the specified transmission time point that is closest to the expected transmission time in absolute time is selected as the target transmission time for transmitting the first information, and the first information is transmitted at the target transmission time.
  • the transmission time of the previous node can also be inferred based on the reception time, and then the transmission time slot interval can be added.
  • the reception time is t0 (2020.12.21 23:53:30:500:520us)
  • the estimated transmission time of the previous node is L0 (2020.12.21 23:53:30:500:500us). If the node is to transmit the first information in the next time slot, the transmission time is L0+30ms; if it is to transmit in the next 3 time slots, the transmission time is L0+90ms.
  • transmitting the first information at the nearest predetermined launch time point before the expected launch time in absolute time includes: before the arrival of the launch time slot of the first information, selecting the predetermined launch time point closest in absolute time to the launch time slot time of the first information to transmit the first information.
  • the communication node After the first information data is prepared, before transmitting the first information according to the preset transmission rules, the communication node confirms the closest predetermined transmission time point and transmits the first information in advance.
  • the preset transmission rules are the forwarding rules and service transmission rules pre-set by the communication terminal.
  • a DMR/PDT terminal uses TDMA dual time slots with a time slot duration of 30ms.
  • a service needs to be transmitted in slot 2, it prepares to transmit data and transmits when slot 2 time arrives.
  • the transmission occurs at the closest predetermined transmission time point before the original slot 2 transmission time arrives. If it is a forwarding service, the transmission also occurs before the time slot for preparing to forward arrives, at the closest predetermined time point. In this embodiment, it is not necessary to obtain the time of receiving information; the communication node only transmits at the closest predetermined time point before preparing to transmit.
  • the plurality of specified launch time points are time points where the absolute time value in microseconds is 0 and 500.
  • the transmission time points (0.0ms, 0.5ms, 1.0ms, etc.) are defined as time points where the absolute time value in microseconds is 0 and the absolute time value is 500.
  • the specified launch time is an integer multiple of the phase alignment duration in absolute time.
  • the phase alignment duration is 500 microseconds.
  • the phase alignment duration of 500 microseconds is used as an example for explanation. That is, the satellite time of the satellite positioning system is used as the absolute time, and it is predetermined that the communication node will only transmit signals at integer multiples of 500 microseconds (e.g., 500us, 1000us, 15000us%) in absolute time.
  • 500 microseconds e.g., 500us, 1000us, 15000us
  • the phase alignment duration is obtained, and the fixed length of the phase alignment duration is a positive integer multiple of the minimum unit time of the positioning system of the communication node.
  • the start point, center point, or synchronization word of the transmitted frame symbol is aligned only with a series of fixed transmission time points. That is, each transmission aligns the transmitted frame symbol to whole milliseconds (e.g., 1ms, 2ms, 3ms%) or half-milliseconds (e.g., 0.5ms, 1ms, 1.5ms%), rather than completely aligning it with the phase of the received signal. This eliminates received signal processing errors and transmission distance delays. Since the symbol length is fixed, aligning any position of the symbol with the specified transmission time points is also possible and not limited in this embodiment.
  • This embodiment also provides another signal synchronization method, which is applied to the service originating communication node of a wireless ad hoc network.
  • the method includes: receiving a triggered transmission request; generating first information according to the transmission request; transmitting the first information at a predetermined transmission time point closest to the current time in absolute time when transmitting the first information, wherein the predetermined transmission time point is one of multiple fixed points among the values of a unit time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration; the phase alignment duration is less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network; wherein the unit time is consistent with the time unit of the phase alignment duration.
  • the estimated transmission time of the originating node is: the current time when it is ready to transmit.
  • the current time refers to the time when the originating node meets the conditions for transmitting the first information, and the terminal can immediately transmit the first information.
  • the originating node receives the transmission request triggered by the external interface, generates the first information according to the transmission request, and transmits the first information at a predetermined transmission time point that is closest to the current time in absolute time.
  • the originating node can theoretically launch at any time, and the latency can be uniformly reduced starting from the second node.
  • FIG. 3 is an implementation flowchart of an embodiment of this application, it includes:
  • Device A begins transmitting a wireless signal at 0.5ms.
  • the signals received by devices B and C have different delays. However, since the time when devices B and C start receiving signals is still earlier than 1ms, that is, the signal reception time of devices B and C is between 0.5ms and 1ms. In this embodiment, the transmission distance between devices is limited, and signals from more than 150km away cannot be received. The transmission delay corresponding to this spatial distance is 0.5ms. Therefore, devices B and C can determine that the signal was sent at the most recent specified transmission time of 0.5ms before 1ms.
  • devices B and C start forwarding simultaneously in the next time slot, i.e., 30.5ms, thus eliminating the transmission delay of device A's signal.
  • the path difference between different routes can easily exceed 15.6 km after two or three hops, leading to signal demodulation failure. Even a phase difference exceeding one-eighth of a symbol (7.8 km) can significantly reduce sensitivity.
  • the signal synchronization scheme in this embodiment automatically eliminates the delay caused by path differences and prevents delay accumulation due to increased hop count. Since the coverage distance of a single site in an ad hoc network system is not very large, signal reception at each hop node and for most terminals can be guaranteed. This solves the problem of phase difference accumulation caused by the cumulative path difference across different routes in complex paths.
  • this embodiment achieves signal synchronization in a narrowband wireless network without requiring additional synchronization information transmission bandwidth.
  • Wireless synchronization modifications based on existing systems are relatively convenient, highly adaptable, and require minimal alterations.
  • module can refer to a combination of software and/or hardware that performs a predetermined function.
  • the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.
  • Figure 6 is a structural block diagram of a signal synchronization device according to an embodiment of this application. As shown in Figure 6, the device includes:
  • Preparation module 60 is used to prepare the first launch information according to launch requirements
  • the transmission module 62 is used to transmit the first information at the nearest predetermined transmission time point before the expected transmission time in absolute time; the predetermined transmission time point is one of multiple fixed points among the values of a unit time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration; the phase alignment duration is less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network; wherein, the unit time is consistent with the time unit of the phase alignment duration.
  • modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.
  • Embodiments of this application also provide a computer storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.
  • the computer storage medium may be configured to store a computer program for performing the following steps:
  • the predetermined transmission time point is one of multiple fixed points among the values of unit time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration; the phase alignment duration is less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network; wherein, the unit time is consistent with the time unit of the phase alignment duration.
  • the computer storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.
  • various media capable of storing computer programs such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.
  • Embodiments of this application also provide a walkie-talkie, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.
  • the electronic device may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor and the input/output device is connected to the processor.
  • the processor can be configured to perform the following steps via a computer program:
  • the predetermined transmission time point is one of multiple fixed points among the values of unit time in absolute time, and the duration between any two consecutive fixed points is the phase alignment duration; the phase alignment duration is less than or equal to the transmission delay corresponding to the maximum demodulated phase difference in the ad hoc network; wherein, the unit time is consistent with the time unit of the phase alignment duration.
  • sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
  • the units described as separate components may or may not be physically separate.
  • the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
  • the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
  • the integrated unit can be implemented in hardware or as a software functional unit.
  • the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • This computer software product is stored in a computer storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.
  • the aforementioned computer storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

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Abstract

本申请公开了一种信号同步方法及对讲机，属于信号同步技术领域。其中，该方法应用于无线自组网的通信节点，方法包括：根据发射需求，准备发射第一信息；在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射第一信息；规定发射时间点为在绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；相位对齐时长小于等于自组网中可解调的最大相位差对应的传输时延；其中，单位时间与相位对齐时长的时间单位一致。通过本申请，通信节点在规定的时刻发射信号，从而每一个通信节点都可以确定上一跳通信节点发射信号的准确发射时间，保证了各通信节点发射信号的同步，从而减少信号传输延时。

Description

信号同步方法及对讲机
本申请要求于2024年6月7日提交的申请号为202410743847.2，发明名称为“信号同步方法及对讲机”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及信号同步技术领域，具体而言，涉及一种信号同步方法及对讲机。
背景技术
无线自组网是由一组带有无线收发装置的可移动节点所组成的一个临时性多跳自治系统，它不依赖于预设的基础设施，具有可临时组网、快速展开、无控制中心、抗毁性强等特点，在军事方面和民用方面等都具有广阔的应用前景，是网络研究中的热点问题。
在窄带自组网设备的使用过程中，现有同步技术主要是发送与接收信号同步，即每一个设备发射信号的时刻参考该设备接收信号的时刻。而自组网不可避免地包括多路由，从首发设备到某个接收设备之间可能存在多条传输路径，如果信号通过不同路径达到该接收设备，由于设备之间的距离不同，自组网多路信号转发的路程不同，路程的差异容易造成多个信号的相位差，相位差超过一定范围，将难以进行解调。
针对相关技术中存在的上述问题，目前尚未发现有效的解决方案。
发明内容
本申请提供了一种信号同步方法及对讲机，以解决相关技术中存在的上述技术问题。
根据本申请的一个实施例，提供了一种信号同步方法，包括：根据发射需求，准备发射第一信息；在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
根据本申请的又一个实施例，还提供了一种信号同步的装置，所述装置包括：生成模块、计算模块和发射模块，其中，生成模块，用于生成待发送的第一信息；
计算模块，用于计算所述第一信息的发射时间点，所述第一信息的发射时间点为在绝对时间上最接近当前时间的一个规定发射时间点；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
发射模块，在所述第一信息的发射时间点发射所述第一信息。
根据本申请的又一个实施例，还提供了一种计算机存储介质，所述计算机存储介质中存储有计算机程序，其中，所述计算机程序被设置为运行时执行上述任一项装置实施例中的步骤。
根据本申请的又一个实施例，还提供了一种对讲机，包括处理器、通信接口、存储器和通信总线，其中，处理器，通信接口，存储器通过通信总线完成相互间的通信；其中：存储器，用于存放计算机程序；处理器，用于通过运行存储器上所存放的程序来执行上述方法中的步骤。
根据本申请的又一个实施例，还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述方法中的步骤。
通过本申请实施例，本节点通信设备通过接收上一跳节点通信设备发射的第二信号，得到接收第二信号的接收时间，并获取通信系统内的相位对齐时长，根据接收时间和相位对齐时长，确定本地设备向下一跳节点通信设备发射第一信号的目标发射时间，通过规定的相位对齐时长，设定设备的发射时间，各节点通信设备在特定的时刻发射信号，保证了各设备发射信号的同步，从而减少信号传输延时。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是本申请实施例的一种计算机的硬件结构框图；
图2是本申请实施例的一种信号同步方法的流程图；
图3是本申请实施例中各个节点设备发射时刻示意图；
图4是本申请实施例的基于PDT/DMR协议的洪泛式自组网系统示意图；
图5是现有同步方案中各个节点设备发射时刻示意图；
图6是是本申请实施例的一种信号同步装置的结构框图。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分的实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本申请保护的范围。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
实施例1
本申请实施例一所提供的方法实施例可以在对讲机、手机、计算机或者类似的无线运算装置中执行。以运行在对讲机上为例，图1是本申请实施例的一种对讲机的硬件结构框图。如图1所示，对讲机可以包括一个或多个(图1中仅示出一个)处理器102(处理器102可以包括但不限于微处理器MCU或可编程逻辑器件FPGA等的处理装置)和用于存储数据的存储器104，可选地，上述对讲机还可以包括用于通信功能的传输设备106以及输入输出设备108。本领域普通技术人员可以理解，图1所示的结构仅为示意，其并不对上述计算机的结构造成限定。例如，计算机还可包括比图1中所示更多或者更少的组件，或者具有与图1所示不同的配置。
存储器104可用于存储计算机程序，例如，应用软件的软件程序以及模块，如本申请实施例中的一种信号同步方法对应的计算机程序，处理器102通过运行存储在存储器104内的计算机程序，从而执行各种功能应用以及数据处理，即实现上述的方法。存储器104可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。
传输设备106用于经由一个网络接收或者发送数据。上述的网络具体实例可包括通信供应商提供的无线网络。在一个实例中，传输设备106包括一个网络适配器(Network Interface Controller，简称为NIC)，其可通过基站与其他网络设备相连从而可与互联网进行通讯。在一个实例中，传输设备106可以为射频(Radio Frequency，简称为RF)模块，其用于通过无线方式与其它通信设备进行通讯。
参照图4和图5，其中，图5是现有同步方案中各个节点设备发射时刻同步示意图，在一个示例中，以卫星定位系统的绝对时间为基础：
1、将首发设备发射的绝对时间设定为为0ms，则首发设备在0ms开始发射无线信号；
2.由于首发设备相对a设备和A设备之间的距离相同，均为20km，因此信号从首发设备分别到a设备和A设备之间的信号传输时间相同，通过距离除以光速计算信号传输时间为0.067ms，即a设备和A设备接收到该信号的开始接收时间为0.067ms，现有同步方案中，设备发射信号的时刻与接收信号的时刻同步，即发射信号的时刻＝接收信号的时刻+n个系统的单位时隙，n≥1，若设备在接收时隙的下一个时隙发射，则a设备和A设备从30.067ms开始转发该信号，需要说明的是，本实施例以PDT/DMR(PDT，Police Digital Trunking警用数字集群)(DMR，Digital Mobile Radio数字移动通信标准)系统为例，在PDT系统中，单位时隙为30ms，转发规则为若在前一个时隙接收信号，则在后一个时隙发送信号，例如0～30ms接收，30～60ms发送，60ms～90ms接收...。图4是基于PDT/DMR(窄带2时隙TDMA系统，1个时隙30ms、4FSK调制方式、符号速率4.8kbps)协议的洪泛式自组网系统，系统采用跟随式同步方式，即每一个设备都根据接收到的信号相位和时隙确定自身发射信号的相位和时隙。
3.a设备相对b设备之间的距离为40km，信号从a设备到b设备之间的信号传输时间为0.133ms，即a设备转发的信号到达b设备需要0.133ms，b设备接收信号的时刻为30.067+0.133＝30.2ms，因此，b设备发射信号的时刻为30.2+30＝60.2ms，即b设备从60.2ms开始转发该信号；A设备相对B设备之间的距离为20km，信号从A设备到B设备之间的信号传输时间为0.067ms，即A设备转发的信号到达B设备需要0.067ms，B设备接收信号的时刻为30.067+0.067＝30.134ms，因此，B设备发射信号的时刻为30.134+30＝60.134ms，即B设备从60.134ms开始转发该信号；
4.接收设备相对b设备的距离为20km，信号从b设备到接收设备的信号传输时间为0.067ms，即接收设备接收b设备转发的信号的接收时刻为60.2+0.067＝60.267ms；接收设备相对B设备的距离为20km，信号从B设备到接收设备的信号传输时间为0.067ms，即接收设备接收B设备转发的信号的接收时刻为60.134+0.067＝60.201ms，即b设备和B设备发射的信号到达接收设备的时候信号时间差达到了0.066ms，而PDT符号周期为0.208ms，相位差接近1/3符号，如果两路信号强度相差不大(<10dB)，则接收设备无法正确解调该信号，将导致通信失败，其中，只要一个信号比另一个信号的信号强度大的足够多，说明信号强度较弱的信号只是一个很小的噪声，不影响信号解调，因此，如果两路信号强度相差不大(<10dB)，且两路信号的延时不同，相位相差较大，不同信号之间存在重叠影响，导致接收设备无法进行区分，无法正确解调该信号。
针对上述现有同步方案存在的技术问题，在本实施例中提供了一种信号同步方法，该信号同步方法应用于无线自组网的通信节点，图2是根据本申请实施例的一种信号同步方法的流程图，如图2所示，该流程包括如下步骤：
步骤S10，根据发射需求，准备发射第一信息；
步骤S20，在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
在本实施例中，绝对时间为当前通信节点获取的绝对时间，其与其它各个通信节点获取的绝对时间是相同的时间标准，例如：格林威治时间。获取方式包括但不限于：通过GPS获取绝对时间，通过wifi、无线网络获取绝对时间(例如：从互联网NTP服务器获取时间)。
规定发射时间点为在绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长。其中，单位时间例如ms单位、us单位，在一个示例中，最小单位时间为1000us，相位对齐时长500us，则固定发射时间点为0us、500us的时间点。优选地，相位对齐时应大于等于无线自组网中的平均传输延时，这样可以解决大部分的延时问题，确保网络同步性。
在通信节点为中间节点时，中间节点的预计发射时间为：发射时隙时间，发射时隙时间为如上述现有同步方案中的预计发射时间，对预计发射时间进行调整，调整后的发射时间为：发射时隙时间之前最接近的规定时间点。其中，最接近的规定时间点包括了与发射时隙时间相同的规定时间点，在存在相同的规定时间点时，相同的规定时间点即作为最接近的规定时间点。在一个示例中，中间节点b设备的预计发射时隙时间为60.2ms，则在该发射时隙时间60.2ms之前最接近的规定时间点60ms，发射第一信息，提前在规定发射时间点发射消除了延时。
通过本实施例设备发射信号不是完全与接收信号的相位对齐，而是规定了通信节点的一系列发射时间点，通信节点在规定的时刻发射信号，从而每一个中间通信节点都可以消除上一跳通信节点发射信号的延时，保证了各通信节点发射信号的同步，从而减少信号传输延时，且可解决在多路传输时，由于路程的差异容易造成多个信号的相位差，相位差超过一定范围，将难以进行解调的问题。
在本实施例的另一实施方式中，执行节点为始发节点，所述方法还包括：
步骤A，接收触发的发射需求，根据所述发射请求生成第一信息；
步骤B，在发射所述第一信息时，在绝对时间上最接近当前时间的一个规定发射时间点上发射所述第一信息。
在通信节点为始发节点时，始发节点的预计发射时间为：准备好发射的当前时间，当前时间是指始发节点满足发射第一信息的条件时的时间，终端可以即刻将第一信息发射出去。本实施例中，发射需求可由外部接口触发，例如：对讲机的PTT按键触发、键盘触发、语音命令触发等。始发节点接收外部接口触发的发射需求，根据发射请求生成第一信息，在发射第一信息时，在绝对时间上当前时间之后最接近的一个规定发射时间点上发射第一信息。即通信设备在准备好发射之后可能会延迟一定时间，在规定发射时间点上发射。
在另一可实施方式中，始发节点理论上可以在任意时间发射，从第二个节点开始统一减少延时也是可行的。当然如果始发节点也遵循在规定时间点发射能够实现更精准的发射同步，此时对当前时间进行调整，调整后的发射时间为：当前时间之后最接近的规定发射时间点，始发节点延时发射，以确保在规定时间点发射。
在本实施例的另一实施方式中，所述根据发射需求，准备发射第一信息包括：
S11，所述通信节点接收上一通信节点发送的第二信息，获取接收所述第二信息的接收时间；所述第二信息为所述上一通信节点在绝对时间上的一个规定发射时间点上发送的；
S12，根据转发所述第二信息的需求，基于所述第二信息生成第一信息，并确定发射所述第一信息的发射时隙；
通信节点接收上一通信节点发送的第二信息，获取接收该第二信息的接收时间，并与第二信息进行同步。其中，接收时间可以是第二信息的开始接收时间，或者第二信息的接收结束时间。根据转发第二信息的需求，基于第二信息生成第一信息，并确定发射第一信息的发射时隙，该发射时隙基于终端预设的转发规则，例如可以为后续的第一个、第二个或第三个时隙进行数据转发。
在本实施例中，上一通信节点为中间节点时，所述第二信息为所述上一通信节点在绝对时间上的一个规定发射时间点上发送的。上一通信节点为始发节点时，第二信息为始发节点在绝对时间上的一个规定发射时间点上发送的，或者，第二信息为始发节点在任意时间发射。
在本实施方式中，所述在绝对时间上在预计发射时间之前最接近的一个规定发射时间点发射所述第一信息包括：
S21，根据所述第二信息的接收时间和所述第一信息的发射时隙确定发射所述第一信息的预计发射时间，选择在绝对时间上与所述预计发射时间之前最接近的一个规定发射时间点作为发射所述第一信息的目标发射时间，在所述目标发射时间发射所述第一信息；
预计发射时间可以为：第二信息开始接收时间+N个单位的时隙时间，N>＝1；或者，预计发射时间还可以为：第二信息接收结束时间+M个单位时隙时间，M>＝0。在一个示例中，第二信息的开始接收时间为T1，单位时隙时间为t0(例如：30ms)，第一信息的发射时隙为当前接收时隙所在周期的下一个发射周期(一个周期为2个时隙)中的第二个时隙(即3个时隙之后)，则第一信息的预计发射时间＝T1+3*t0，选择在绝对时间上与该预计发射时间之前最接近的一个规定发射时间点作为发射第一信息的目标发射时间，在目标发射时间发射第一信息。
S22，或，确认在绝对时间上所述第二信息的接收时间之前最接近的一个规定发射时间点，根据所述规定发射时间点和所述第一信息的发射时隙，确认发射所述第一信息的目标发射时间，在所述目标发射时间发射所述第一信息。
本实施方式中还可以根据接收时间，推断前一节点的发射时间，再加上发射时隙间隔的时隙时间。在一示例中，接收时间t0(2020.12.21日23:53:30:500:520us)，则前一节点的推定发射时间为L0(2020.12.21日23:53:30:500:500us)，如果节点要在下一个时隙发射第一信息，则发射时间为L0+30ms，若下3个时隙发射，则发射时间为L0+90ms。
在本实施例的另一实施方式中，所述在绝对时间上在预计发射时间之前最接近的一个规定发射时间点发射所述第一信息包括：在所述第一信息的发射时隙到来之前，选择绝对时间上与所述第一信息的发射时隙时间最近的一个规定发射时间点发射所述第一信息。
本实施方式中，通信节点在第一信息数据准备好之后，按照预设发射规则发射第一信息之前，确认最接近的规定发射时间点，提前将第一信息发射出去。
其中，预设发射规则为通信终端预先设置的转发规则、业务发射规则等，例如DMR/PDT制式的终端，为TDMA双时隙，时隙时长30ms，需要在slot2发射业务时，会准备发射数据，在slot2时间到达时发射。本实施例在原来slot2发射的时间到来之前最接近的规定发射时间点发射。如果是转发业务，也是在准备转发的时隙时间到来之前，在最接近的规定时间点提前转发。本实施方式中不需要获取接收信息的时间，通信节点只在准备发射之前，在最接近的规定时间点提前发射。
在本实施例的另一实施方式中，所述多个规定发射时间点为所述绝对时间上微秒单位时间上取值为0和500的时间点。
如图3，规定发射时间点(0.0ms，0.5ms，1.0ms等)为绝对时间上微秒单位时间上取值为0和500的时间点，
所述规定发射时间点为所述绝对时间上相位对齐时长整数倍的时间点。其中，相位对齐时长为500微秒。
本实施例中，以相位对齐时长为500微秒为例进行说明，即以卫星定位系统的卫星时间为绝对时间，预先规定通信节点只在绝对时间上以500微秒的整数倍时刻(例如500us、1000us、15000us...)发射信号。
获取所述相位对齐时长，所述相位对齐时长的固定长度是所述通信节点的定位系统的最小单位时间的正整数倍。
本实施例中，发射帧符号的起始点、发射帧符号的中心点或者发射帧符号的同步字的中心只对齐规定一系列固定的规定发射时间点，即每次发射时都将发射帧符号对齐整毫秒(例如1ms、2ms、3ms...)或半毫秒(例如0.5ms、1ms、1.5ms...)，而不是完全与接收信号的相位对齐，这样可以消除接收信号处理误差和传输距离延时。由于符号长度是固定的，还可以将符号的任何一个位置与规定发射时间点对齐均可以实现，在本实施例中不进行限制。
在本实施例中还提供了另一种信号同步方法，该信号同步方法应用于无线自组网的业务始发通信节点，所述方法包括：接收触发的发射请求，根据所述发射请求生成第一信息；在发射所述第一信息时，在绝对时间上最接近当前时间的一个规定发射时间点上发射所述第一信息，所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
在通信节点为始发节点时，始发节点的预计发射时间为：准备好发射的当前时间，当前时间是指始发节点满足发射第一信息的条件时的时间，终端可以即刻将第一信息发射出去。本实施例中，始发节点接收外部接口触发的发射需求，根据发射请求生成第一信息，在发射第一信息时，在绝对时间上最接近当前时间的一个规定发射时间点上发射第一信息。
在另一可实施方式中，始发节点理论上可以在任意时间发射，从第二个节点开始统一减少延时。
本实施例的方案提供了一种信号同步方法，参考图3，图3是本申请实施例中的一个实施流程图，包括：
1、A设备在0.5ms处开始发射无线信号；
2、由于A设备到B设备，和A设备到C设备的距离不同，导致B设备和C设备接收到的信号产生了不同的延时，但由于B设备和C设备开始接收信号的时刻仍然早于1ms，即B设备和C设备接收信号的接收时间在0.5ms～1ms之间，且在本实施例中，设备之间的传输距离有限，通常无法接收150km以外的信号，该空间距离对应的传输延时为0.5ms，因此B设备和C设备可以确定该信号是在1ms之前的最近一个规定发射时刻0.5ms时刻发送的。
3、根据转发规则，B设备和C设备同时在下一时隙即30.5ms开始转发，消除了A设备信号的传输时延。
在E-pack自组网应用中，由于不同路由的路程差在两三跳以后很容易超过15.6公里，导致信号无法解调，甚至当相位差超过八分之一符号(7.8km)都会大幅降低灵敏度。在采用本实施例方案进行信号同步可自动消除路程差带来的延时，并且不会因为跳数增加造成延时累积。由于在自组网系统中单站覆盖距离都不会太大，因此能够保证各跳转节点和大部分终端的信号接收。解决了复杂路径下经过不同路由产生的路程差累计导致的相位差累计。
另外，本实施例在窄带无线网络中实现信号同步，不需要额外的同步信息传输带宽。基于现有系统的无线同步改造比较方便，适应性强，改动小。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
实施例2
在本实施例中还提供了一种信号同步装置，用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图6是根据本申请实施例的一种信号同步装置的结构框图，如图6所示，该装置包括：
准备模块60，用于根据发射需求，准备发射第一信息；
发射模块62，用于在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
实施例3
本申请的实施例还提供了一种计算机存储介质，该计算机存储介质中存储有计算机程序，其中，该计算机程序被设置为运行时执行上述任一项方法实施例中的步骤。
可选地，在本实施例中，上述计算机存储介质可以被设置为存储用于执行以下步骤的计算机程序：
S1，根据发射需求，准备发射第一信息；
S2，在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
可选地，在本实施例中，上述计算机存储介质可以包括但不限于：U盘、只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、移动硬盘、磁碟或者光盘等各种可以存储计算机程序的介质。
本申请的实施例还提供了一种对讲机，包括存储器和处理器，该存储器中存储有计算机程序，该处理器被设置为运行计算机程序以执行上述任一项方法实施例中的步骤。
可选地，上述电子设备还可以包括传输设备以及输入输出设备，其中，该传输设备和上述处理器连接，该输入输出设备和上述处理器连接。
可选地，在本实施例中，上述处理器可以被设置为通过计算机程序执行以下步骤：
S1，根据发射需求，准备发射第一信息；
S2，在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
在本申请的上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
在本申请所提供的几个实施例中，应该理解到，所揭露的技术内容，可通过其它的方式实现。其中，以上所描述的装置实施例仅仅是示意性的，例如所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，单元或模块的间接耦合或通信连接，可以是电性或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个计算机存储介质中，包括若干指令用以使得一台计算机设备(可为个人计算机、服务器或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的计算机存储介质包括：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述仅是本申请的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (12)

  1. 一种信号同步方法，其特征在于，应用于无线自组网的通信节点，所述方法包括：
    根据发射需求，准备发射第一信息；
    在绝对时间上在预计发射时间之前最接近的一个规定发射时间点，发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    接收触发的发射请求，根据所述发射请求生成第一信息；
    在发射所述第一信息时，在绝对时间上最接近当前时间的一个规定发射时间点上发射所述第一信息。
  3. 根据权利要求1所述的方法，其特征在于，所述根据发射需求，准备发射第一信息包括：
    所述通信节点接收上一通信节点发送的第二信息，获取接收所述第二信息的接收时间；
    根据转发所述第二信息的需求，基于所述第二信息生成第一信息，并确定发射所述第一信息的发射时隙；
    所述在绝对时间上在预计发射时间之前最接近的一个规定发射时间点发射所述第一信息包括：
    根据所述第二信息的接收时间和所述第一信息的发射时隙确定发射所述第一信息的预计发射时间，选择在绝对时间上与所述预计发射时间之前最接近的一个规定发射时间点作为发射所述第一信息的目标发射时间，在所述目标发射时间发射所述第一信息。
  4. 根据权利要求1所述的方法，其特征在于，所述根据发射需求，准备发射第一信息包括：
    所述通信节点接收上一通信节点发送的第二信息，获取接收所述第二信息的接收时间；
    根据转发所述第二信息的需求，基于所述第二信息生成第一信息，并确定发射所述第一信息的发射时隙；
    所述在绝对时间上在预计发射时间之前最接近的一个规定发射时间点发射所述第一信息包括：
    确认在绝对时间上所述第二信息的接收时间之前最接近的一个规定发射时间点，根据所述规定发射时间点和所述第一信息的发射时隙，确认发射所述第一信息的目标发射时间，在所述目标发射时间发射所述第一信息。
  5. 根据权利要求1所述的方法，其特征在于，所述在绝对时间上在预计发射时间之前最接近的一个规定发射时间点发射所述第一信息包括：
    在所述第一信息的发射时隙到来之前，选择绝对时间上与所述第一信息的发射时隙时间最近的一个规定发射时间点发射所述第一信息。
  6. 根据权利要求1所述的方法，其特征在于，所述多个规定发射时间点为所述绝对时间上微秒单位时间上取值为0和500的时间点。
  7. 根据权利要求1所述的方法，其特征在于，所述规定发射时间点为所述绝对时间上所述相位对齐时长整数倍的时间点。
  8. 根据权利要求1所述的方法，其特征在于，所述相位对齐时长为500微秒。
  9. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    获取所述相位对齐时长，所述相位对齐时长的固定长度是所述通信节点的定位系统的最小单位时间的正整数倍。
  10. 一种信号同步方法，其特征在于，应用于无线自组网的通信节点，所述方法包括：
    接收触发的发射请求，根据所述发射请求生成第一信息；
    在发射所述第一信息时，在绝对时间上最接近当前时间的一个规定发射时间点上发射所述第一信息；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致。
  11. 一种信号同步的装置，其特征在于，所述装置适用于无线自组网的通信节点，所述装置包括：生成模块、计算模块和发射模块；
    生成模块，用于生成待发送的第一信息；
    计算模块，用于计算所述第一信息的发射时间点，所述第一信息的发射时间点为在绝对时间上最接近当前时间的一个规定发射时间点；所述规定发射时间点为在所述绝对时间上单位时间的取值中的多个固定点，任意连续两个固定点之间的时长为相位对齐时长；所述相位对齐时长小于等于所述自组网中可解调的最大相位差对应的传输时延；其中，所述单位时间与所述相位对齐时长的时间单位一致；
    发射模块，在所述第一信息的发射时间点发射所述第一信息。
  12. 一种对讲机，其特征在于，包括处理器、通信接口、存储器和通信总线，其中，处理器，通信接口，存储器通过通信总线完成相互间的通信；
    其中：
    存储器，用于存放计算机程序；
    处理器，用于通过运行存储器上所存放的程序来执行权利要求1至9中任一项所述的信号同步方法。
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CN118574208A (zh) * 2024-06-07 2024-08-30 海能达通信股份有限公司 信号同步方法及对讲机

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