WO2020087370A1

WO2020087370A1 - Method and device for time synchronization, and storage medium

Info

Publication number: WO2020087370A1
Application number: PCT/CN2018/113119
Authority: WO
Inventors: 王春龙; 周永林; 杨柯
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2020-05-07
Also published as: CN109565772A

Abstract

A method and device for time synchronization, and a storage medium. The method comprises: sending a synchronization request signal, and receiving an acknowledgement signal; determining a transmission time according to a first time at which the synchronization request signal is sent and a time at which the acknowledgement signal is received; receiving a synchronization response signal comprising information about a second time; and adjusting a system time of a first wireless device according to the first time, the transmission time and the second time. The invention can realize accurate time synchronization between wireless devices.

Description

Time synchronization method, equipment and storage medium

Technical field

The embodiments of the present application relate to communication technologies, and in particular, to a time synchronization method, device, and storage medium.

Background technique

With the continuous development of wireless technology, there are more and more scenarios where wireless devices work together based on wireless transmission. Data collection based on wireless technology requires multiple devices to work together.

However, in actual data acquisition applications, the requirements for time synchronization are relatively high. For example, bridge condition monitoring, dam monitoring, aircraft static test, aircraft dynamic mechanics test, etc., because there are many collection points, the collection speed varies from a few hertz to a few hundred hertz, and the time between these collection points is synchronized Is a big problem. At present, in some existing wired networks, time synchronization can be performed by means of bus broadcasting. According to network deployment, the synchronization accuracy varies from 1 ms to 100 ms.

However, in wireless-based networks, the uncertainty of the transmission time of different devices makes the reliability of time synchronization in the broadcast mode poor, so how to accurately achieve time synchronization between devices is extremely important.

Summary of the invention

Embodiments of the present application provide a time synchronization method, device, and storage medium to accurately achieve time synchronization between devices.

In a first aspect, an embodiment of the present application provides a time synchronization method, including:

The first wireless device sends a synchronization request signal to the second wireless device;

The first wireless device receives an acknowledgement ACK signal sent by the second wireless device;

The first wireless device determines the transmission time according to the first time when the synchronization request signal is sent and the time when the ACK signal is received;

The first wireless device receives a synchronization response signal sent by the second wireless device; the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization request Signal time

The first wireless device adjusts the system time of the first wireless device according to the first time, the transmission time, and the second time.

In a second aspect, an embodiment of the present application may also provide a time synchronization method, including:

The second wireless device receives the synchronization request signal sent by the first wireless device;

When receiving the synchronization request signal, the second wireless device sends an acknowledgement ACK signal to the first wireless device; the ACK signal is used to cause the first wireless device to send the synchronization request signal according to the first A time, and the time when the ACK signal is received, determine the transmission time;

The second wireless device sends a synchronization response signal to the first wireless device, the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization request signal The second time is used to allow the first wireless device to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.

In a third aspect, an embodiment of the present application may further provide a wireless device. The wireless device is a first wireless device, and the wireless device includes:

A sending module, configured to send a synchronization request signal to the second wireless device;

A first receiving module, configured to receive an acknowledgement ACK signal sent by the second wireless device;

A determining module, configured to determine the transmission time according to the first time when the synchronization request signal is sent and the time when the ACK signal is received;

A second receiving module, configured to receive a synchronization response signal sent by the second wireless device; the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization Request signal time;

The adjustment module is configured to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.

According to a fourth aspect, an embodiment of the present application may further provide a wireless device. The wireless device is a second wireless device, including:

A receiving module, configured to receive a synchronization request signal sent by the first wireless device;

A first sending module, configured to send an acknowledgement ACK signal to the first wireless device when receiving the synchronization request signal; the ACK signal is used to enable the first wireless device to send the synchronization request signal according to the The first time, and the time when the ACK signal is received, determines the transmission time;

A second sending module, configured to send a synchronization response signal to the first wireless device, the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization request The time of the signal; the second time is used to allow the first wireless device to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.

According to a fifth aspect, an embodiment of the present application may further provide a wireless device. The wireless device includes: a memory and a processor; the memory is coupled to the processor;

The memory is used to store program instructions;

The processor is configured to call program instructions stored in the memory, so that the wireless device executes the time synchronization method described in the first aspect.

According to a sixth aspect, an embodiment of the present application may further provide a wireless device. The wireless device includes: a memory and a processor; the memory is coupled to the processor;

The memory is used to store program instructions;

The processor is configured to call program instructions stored in the memory, so that the wireless device executes the time synchronization method described in the second aspect.

According to a seventh aspect, a computer-readable storage medium includes: a computer program stored thereon, wherein the computer program is executed by a processor to implement the time synchronization method described in the first aspect.

An eighth aspect is a computer-readable storage medium, comprising: a computer program stored thereon, wherein the computer program is executed by a processor to implement the time synchronization method described in the second aspect above.

The time synchronization method, device, and storage medium provided in the embodiments of the present application may send a synchronization request signal to a second wireless device through a first wireless device, and receive an ACK signal sent by the second wireless device, and send the synchronization request signal The first time and the time when the ACK signal is received, determine the transmission time, and also receive the synchronization response signal sent by the second wireless device, the synchronization response signal includes: the second wireless device receives the synchronization request signal The second time information of the two times, so that the time of the first wireless device can be adjusted according to the first time, the transmission time, and the second time. The method can realize the time synchronization between the first wireless device and the second wireless device by adjusting the system time of the first wireless device, so that the system time between other wireless devices connected to the second wireless device is also synchronized, thereby Accurately synchronize time between wireless devices.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, without paying creative labor, other drawings may be obtained based on these drawings.

1 is a schematic diagram of a network topology structure to which a time synchronization method according to an embodiment of the present application is applicable;

2 is a flowchart 1 of a time synchronization method provided by an embodiment of the present application;

3 is a time relationship diagram between a first wireless device and a second wireless device provided by an embodiment of this application;

4 is a flowchart 2 of a time synchronization method provided by an embodiment of the present application;

FIG. 5 is a timing diagram of a radio frequency signal in a time synchronization method for a classic Bluetooth system provided by an embodiment of this application;

6 is a timing diagram of synchronizing radio frequency signals in a time synchronization method for a BLE system provided by an embodiment of the present application;

7 is a schematic structural diagram 1 of a wireless device according to an embodiment of the present application;

8 is a second schematic structural diagram of a wireless device according to an embodiment of the present application;

9 is a schematic structural diagram 3 of a wireless device according to an embodiment of the present application;

10 is a fourth structural diagram of a wireless device according to an embodiment of the present application.

detailed description

To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terminology used in the specification of the present application herein is for the purpose of describing specific embodiments only, and is not intended to limit the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In the following, some embodiments of the present application will be described in detail with reference to the drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

The time synchronization method, device and storage medium provided by the following embodiments of the present application can be applied to a multi-device network topology based on wireless technology, also known as "wireless transmission technology". The network topology structure will be described below in conjunction with examples. FIG. 1 is a schematic diagram of a network topology structure to which a time synchronization method according to an embodiment of the present application is applicable. As shown in FIG. 1, at least one client device 12 can be connected to the server device 11. The server device 11 may also be called a master device, and the client device 12 may also be called a slave device. In this application, the server device 11 and each client device 12 are wireless devices.

The network topology applicable to the solution involved in this application can be applied to the field of data collection based on wireless technology, and can also be applied to the field of non-data collection. In the field of data collection based on wireless technology, the server device 11 may be a mobile phone, a tablet computer, a data collection device, etc., and the client device 12 may be a data sensor. In the non-data collection field, the server device 11 may be a mobile phone, a tablet computer, etc., and the client device 12 may be a headset, wrist watch, bracelet, or other smart wearable device.

The wireless technology used between the server device 11 and the client device 12 may be, for example, Wireless-Fidelity (WiFi), Infrared Data Association (IrDA), Bluetooth, Bluetooth Low Energy (Bluetooth Low Energy, referred to as BLE), Zigbee and other types of wireless transmission technology. Taking Bluetooth technology as an example, both the server device 11 and the client device 12 may be Bluetooth devices.

When the server device 11 is connected to multiple client devices 12 at the same time, since each wireless device has its own clock, different wireless devices, such as the server device 11 and each client device 12 or different clients There may be time out-of-sync between devices 12. Unsynchronized time may cause data errors transmitted between each other. Therefore, the embodiments of the present application provide the following methods to achieve time synchronization between wireless devices and avoid data errors.

Several examples are used to illustrate the following. FIG. 2 is a flowchart 1 of a time synchronization method provided by an embodiment of the present application. The time synchronization method can be implemented interactively by the first wireless device and the second wireless device. The first wireless device may be, for example, any client device 12 shown in FIG. 1 above, and the second wireless device may be, for example, the server device 11 shown in FIG. 1. As shown in Figure 2, the method may include:

S201. The first wireless device sends a synchronization request (sync_request) signal to the second wireless device.

The first wireless device may use a preset wireless technology to send a synchronization request signal to the second wireless device. The preset wireless technology may be, for example, Bluetooth technology, and the first wireless device and the second wireless device may be Bluetooth devices. It should be noted that, in this application, a Bluetooth device refers to a device that supports Bluetooth technology, not just a device that supports Bluetooth technology. That is to say, the Bluetooth device can also support other devices based on Bluetooth technology. The transmission technology is not repeated here.

The first wireless device may send a synchronization request signal to the second wireless device when establishing a wireless connection with the second wireless device. That is to say, before the first wireless device sends a synchronization request signal to the second wireless device in S201, the method may further include:

The first wireless device establishes a wireless connection with the second wireless device.

In this embodiment, the first wireless device may initiate a request to establish a wireless connection with the second wireless device, or the second wireless device may initiate a request to establish a wireless connection with the first wireless device.

When sending the synchronization request to the second wireless device, the first wireless device records the first time such as T1 when the synchronization request signal is sent. The first time may be the local time when the first wireless device sends the synchronization request signal.

S202. The second wireless device receives the synchronization request signal sent by the first wireless device.

S203. The second wireless device sends an acknowledgement (ACKnowledgement, ACK for short) signal to the first wireless device.

The second wireless device sends the ACK signal to the first wireless device to indicate that it received the synchronization request signal. When receiving the synchronization request signal, the second wireless device sends the ACK signal to the first wireless device.

S204. The first wireless device receives the ACK signal sent by the second wireless device.

After sending the synchronization request signal, the first wireless device monitors the signal sent by the second wireless device, and when the ACK signal is received, the time when the ACK signal is received can be determined.

S205. The first wireless device may determine the transmission time according to the first time when the synchronization request signal is sent and the time when the ACK signal is received.

The transmission time, such as t1, may be the signal transmission time between the first wireless device and the second wireless device.

S206. The second wireless device sends a synchronization response (sync_response) signal to the first wireless device, where the synchronization response signal includes: second time information.

When the second wireless device receives the synchronization request signal, it can also determine the second time when the synchronization request signal is received, such as T2, and carry the information of the second time in the synchronization response signal and send it to the first One wireless device. The second time may be the local time when the second wireless device receives the synchronization request signal.

S207. The first wireless device receives the synchronization response signal sent by the second wireless device.

The information at the second time may be indication information at the second time.

S208. The first wireless device adjusts the system time of the first wireless device according to the first time, the transmission time, and the second time.

The first wireless device may adjust the system time of the first wireless device according to the first time, the transmission time, and the second time, so that the system time of the first wireless device is synchronized with the system time of the second wireless device . Among them, the system time synchronization may include: the system time is the same, or the deviation of the system time is within a preset range.

The first wireless device may determine the clock deviation of the first wireless device and the second wireless device according to the first time, the transmission time, and the second time, such as sync_offset, and then adjust the first wireless device according to the clock deviation The system time of the device. For example, the first wireless device may use a preset formula according to the first time, the transmission time, and the second time to obtain the clock deviation. The preset formula may be sync_offset = T2- (T1 + t1), where sync_offset is the clock deviation, T2 is the second time, T1 is the first time, and t1 is the transmission time.

For example, reference may be made to FIG. 3, which is a time relationship diagram between the first wireless device and the second wireless device according to an embodiment of the present application. As shown in FIG. 3, the first wireless device may first establish a wireless connection such as a Bluetooth connection with the second wireless device, and send a synchronization request signal to the second wireless device. The time for the first wireless device to send the synchronization request signal may be T1. The second wireless device receives the synchronization request signal sent by the first wireless device, and the second wireless device receives the second synchronization request signal may be T2. When receiving the synchronization request signal, the second wireless device sends an ACK signal to the first wireless device to indicate that it receives the synchronization request signal. The first wireless device also receives the ACK signal sent by the second wireless device, and based on the time when the ACK signal is received and the time T1 when the synchronization request signal is sent, for example, the time when the ACK signal is received is subtracted from The time T1 of the synchronization request signal obtains the transmission time t1 of the first wireless device. Since there is a clock deviation sync_offset between the first wireless device and the second wireless device, there is a clock deviation between the time when the first wireless device receives the ACK signal and the time when the second wireless device sends the ACK signal, such as sending the The time of the ACK signal is the time T2 when the synchronization request signal is received, then there is a correspondence between T1, T2, t1 and sync_offset as shown below: T2 = T1 + t1 + sync_offset.

The second wireless device also sends the synchronization response signal to the first wireless device, and packages the information of T2 in the synchronization response message. When receiving the synchronization response signal, the first wireless device may obtain sync_offset based on the T1, T2, and t1, and then adjust the system time of the first wireless device according to sync_offset.

It should be noted that, for example, the first wireless device may also adjust the system time of the first wireless device in other ways according to the first time, the transmission time, and the second time. In this other mode, the clock deviation can be determined without first determining, but directly adjusting based on any one of the first time, the transmission time, and the second time, and then adjusting according to the first time, the transmission time, and The other time parameters in the second time are adjusted again, which will not be repeated here.

The time synchronization method provided by the embodiment of the present application may send a synchronization request signal to a second wireless device through the first wireless device, and receive an ACK signal sent by the second wireless device, and according to the first time when the synchronization request signal is sent, And the time when the ACK signal is received, the transmission time is determined, and the synchronization response signal sent by the second wireless device is also received. The synchronization response signal includes: the second time at the second time when the second wireless device receives the synchronization request signal Time information, so that the time of the first wireless device can be adjusted according to the first time, the transmission time, and the second time. The method can realize the time synchronization between the first wireless device and the second wireless device by adjusting the system time of the first wireless device, so that the system time between other wireless devices connected to the second wireless device is also synchronized, thereby Accurately synchronize time between wireless devices.

For example, the first wireless device may be a headset, the second wireless device may be a mobile phone or a tablet computer, and the first wireless device may also be another headset connected to the second wireless device. By performing the time synchronization method of the embodiment of the present application, the system time of the one headset and the mobile phone or tablet can be synchronized. Since the other headset can also execute the time synchronization method, the system time between the two headsets can be achieved Synchronization prevents the playback of the two left and right headphones from being synchronized and improves the user experience.

Regardless of whether it is the first wireless device or the second wireless device, its system time can be counted according to the respective preset timer cycle timeout, and then based on the count value and the respective preset count deviations. No matter which wireless device, the preset timer can be a software timer or a hardware timer. If it is a hardware timer, it can be a hardware timer with an input clock greater than 10MHz to ensure clock accuracy. The cyclic timeout count of the preset timer refers to counting when the preset timer times out, such as updating the count value, and at the same time, triggering the preset timer to restart timing and timing out at the preset timer And count again.

Optionally, the hardware timer may be, for example, a timer that generates a timeout interrupt for 1 ms, that is, the duration of the hardware timer may be, for example, 1 ms, and when the hardware timing duration exceeds 1 ms, an interrupt is generated to update the count value.

The first wireless device is used as an example for description as follows. The first wireless device may have a preset timer, such as a hardware timer, to generate the system time. The first wireless device may perform a cycle time-out count on the preset timer, and obtain the system time of the first wireless device according to the count value and the preset count deviation. The preset count deviation may be, for example, offset, which may be an integer.

Based on the foregoing embodiment, adjusting the system time of the first wireless device according to the first time, the transmission time, and the second time in S208 in the foregoing S208 may include:

The first wireless device adjusts the count deviation according to the clock deviation to adjust the system time of the first wireless device.

Since the system time of the first wireless device is counted by the first wireless device in a cyclic time-out for the preset timer and based on the count value and the preset count deviation, adjusting the count deviation The system time of the first wireless device can be adjusted.

In this example, the clock deviation can be an integer or a floating point number.

Since the clock deviation is obtained by the first wireless device according to the first time, the second time, and the transmission time, any one of the first time, the second time, and the transmission time is a floating-point number. This clock deviation can be made a floating point number.

If the clock deviation is a floating point number, such as a single precision floating point number, in this method, the first wireless device may adjust the count deviation according to the integer part of the clock deviation.

To ensure the adjustment accuracy of the system time, the first wireless device may also adjust the duration of the preset timer according to the fractional part of the clock deviation to adjust the system time of the first wireless device.

That is, in the case where the first wireless device adjusts the count deviation according to the integer part of the clock deviation, it may also adjust the duration of the preset timer according to the fractional part of the clock deviation. Since the system time of the first wireless device is counted by the first wireless device in a cycle time-out for the preset timer, and is obtained according to the count value and the preset count deviation, adjustment of the count deviation can be achieved The adjustment of the system time of the first wireless device, the adjustment of the count deviation and the duration of the preset timer can also achieve the adjustment of the system time of the first wireless device.

In this method, the duration of the preset timer can be adjusted according to the fractional part of the clock deviation, so that the duration of the preset timer is the same as the duration of the preset timer of the second wireless device or the difference is within a preset range In this way, the timeout count of the preset timer of the first wireless device and the preset timer of the second wireless device are synchronized.

In this method, the count deviation can be adjusted according to the integer part of the clock deviation, and the duration of the preset timer can be adjusted according to the fractional part of the clock deviation, thereby achieving accurate adjustment of the system time of the first wireless device to ensure To synchronize the system time of the first wireless device and the second wireless device.

Since the system time of the first wireless device is obtained by the first wireless device according to the value of the number of cycle timeout times of a preset timer and a preset count deviation, and the timing frequency of the preset timer is the first wireless device Obtained according to the system clock frequency, in order to avoid that the system time of the first wireless device and the second wireless device will not be synchronized again with the accumulation of time, the embodiment of the present application may also provide a time synchronization method on the basis of the above, and Adjust the system clock frequency. FIG. 4 is a flowchart 2 of a time synchronization method provided by an embodiment of the present application. As shown in FIG. 4, the method may further include:

S401. The second wireless device sends a radio frequency signal to the first wireless device.

The radio frequency signal may be a radio frequency signal sent at any time after the second wireless device establishes a wireless connection with the first wireless device.

The radio frequency signal may be packetized and transmitted at a preset time interval, that is, the second wireless device may divide the radio frequency signal into multiple time intervals for transmission, and each time interval transmits a corresponding data packet interface. The start time of the preset time in the multiple time intervals used to transmit the radio frequency signal is fixed, and the duration of each time interval may be fixed and unchanged, that is, the same.

During the wireless connection, the first wireless device and the second wireless device may determine the start time of the preset time in the multiple time intervals and the duration of each time interval.

Taking Bluetooth technology as an example, the radio frequency signal may be a radio frequency signal of a Bluetooth air interface.

Each of the above time intervals may also be referred to as a time slot (slot), which may correspond to an interval of a Bluetooth Low Energy (BLE) system. That is, each time interval may include at least one BLE system interval.

For example, FIG. 5 is a timing diagram of a radio frequency signal in a time synchronization method for a classic Bluetooth system provided by an embodiment of the present application. The second wireless device may send a packet of the radio frequency signal in a time slot (TX slot) n, while the first wireless device receives a packet of the radio frequency signal and sends the radio frequency in a time slot (RX slot) n + 1 Another packet of the signal, at the same time the first wireless device receives another packet of the radio frequency signal, and sends another packet of the radio frequency signal in a time slot (TX slot) n + 2, and at the same time the first wireless device receives the Another bag. Similarly, the second wireless device sends the radio frequency signal to the first wireless device in multiple time slots. Correspondingly, the first wireless device receives the radio frequency signal in the multiple time slots, thereby completing the transmission of the radio frequency signal. In the classic Bluetooth system, each time slot is a preset fixed duration, such as 625us.

S402. The first wireless device receives the radio frequency signal sent by the second wireless device.

S403. The first wireless device obtains a synchronization signal according to the radio frequency signal.

When receiving the radio frequency signal, the first wireless device may convert the radio frequency signal into a digital signal through an analog-to-digital converter, and modulate and demodulate the digital signal to obtain synchronization included in the radio frequency signal signal. Therefore, the radio frequency signal may also be referred to as a synchronous radio frequency signal.

For example, FIG. 6 is a timing diagram of synchronizing radio frequency signals in a time synchronization method for a BLE system provided by an embodiment of the present application. The second wireless device may send a packet of the synchronous radio frequency signal at the starting position of Interval n, and at the same time the first wireless device receives a packet of the synchronous radio frequency signal; sending at the starting position of Interval n + 1 Another packet of the synchronous radio frequency signal, and at the same time the first wireless device receives another packet of the synchronous radio frequency signal; another packet of the synchronous radio frequency signal is sent at the starting position of Interval n + 2, and at the same time Receive another packet of the synchronous radio frequency signal. Similarly, the second wireless device sends the synchronous radio frequency signal to the first wireless device at the starting positions of multiple intervals, and the first wireless device receives the synchronous radio frequency signal within multiple intervals, thereby completing the transmission of the synchronous radio frequency signal. In the BLE system, the duration of each interval is a non-fixed duration, and the duration of each interval may be a duration determined by negotiation between the first wireless device and the second wireless device.

S404. The first wireless device obtains an error signal according to the obtained synchronization signal and the preset synchronization signal.

The error signal may include: a time domain error signal and / or a frequency domain error signal. Among them, the time domain error signal may also be called a timing synchronization error signal, and the frequency domain error signal may also be called a carrier synchronization error signal.

The first wireless device may obtain the time domain error signal according to the time domain sub-signal of the synchronization signal and the preset time domain sub-signal of the synchronization signal, and according to the frequency domain sub-signal of the synchronization signal and the preset synchronization signal Frequency domain sub-signal to obtain the frequency domain error signal.

S405. The first wireless device adjusts the system clock frequency according to the error signal.

Optionally, the system clock frequency may be determined by the first wireless device according to the frequency multiplication factor of the phase-locked loop and the oscillation frequency of the crystal oscillator. Among them, the crystal oscillator can also be called a crystal oscillator.

In one example, the first wireless device may adjust the frequency multiplication factor of the phase-locked loop according to the error signal to adjust the system clock frequency.

In another example, the first wireless device may adjust the oscillation frequency of the crystal oscillator according to the error signal to adjust the system clock frequency. The first wireless device can adjust the load capacitance of the crystal oscillator according to the error signal to adjust the oscillation frequency of the crystal oscillator.

Whether adjusting the frequency multiplication factor of the phase-locked loop or the oscillation frequency of the crystal oscillator, the first wireless device can adjust the system clock frequency according to the error signal, so that the system clock frequency of the first wireless device The system clock frequencies of the two wireless devices are synchronized, that is, the same or the difference is within a preset range.

It should be noted that the system clock frequency may also be determined by the first wireless device according to the frequency multiplication coefficient of the phase-locked loop, the oscillation frequency of the crystal oscillator, and other parameters, then the first wireless device may also determine The error signal adjusts the other parameters, which will not be repeated here.

In this method, the system clock frequency can also be adjusted according to the error signal, so that the system clock frequency of the first wireless device can be synchronized with the system clock frequency of the second wireless device, avoiding accumulation of the first wireless device with time The unsynchronized system time of the second wireless device ensures the continuous synchronization of the system time of the first wireless device and the second wireless device.

By performing this method, the system clock frequency is also adjusted, so that the deviation of the system time between the first wireless device and the second wireless device can be, for example, within 1 us, and the synchronization accuracy of the system time is improved to meet the large Some demanding application scenarios.

An embodiment of the present application may further provide a wireless device, and the wireless device may serve as a first wireless device. 7 is a schematic structural diagram 1 of a wireless device according to an embodiment of the present application. The wireless device may perform the time synchronization method performed by any of the first wireless devices in FIG. 2 to FIG. 6 described above. As shown in FIG. 7, the wireless device 70 may include:

The sending module 71 is configured to send a synchronization request signal to the second wireless device.

The first receiving module 72 is configured to receive the ACK signal sent by the second wireless device.

The determining module 73 is configured to determine the transmission time according to the first time when the synchronization request signal is sent and the time when the ACK signal is received.

The second receiving module 74 is configured to receive a synchronization response signal sent by the second wireless device; the synchronization response signal includes: information of a second time; the second time is the time when the second wireless device receives the synchronization request signal .

The first adjustment module 75 is configured to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.

Optionally, the first adjustment module 75 is specifically configured to determine the clock deviation between the first wireless device and the second wireless device based on the first time, the transmission time, and the second time, and based on the clock deviation, Adjust the system time of the first wireless device.

Optionally, the system time of the first wireless device is obtained by the first wireless device according to a preset timer cycle timeout value and a preset count deviation.

The first adjustment module 75 is specifically configured to adjust the count deviation according to the clock deviation to adjust the system time of the first wireless device.

Optionally, the clock deviation is a floating point number.

The first adjustment module 75 is specifically configured to adjust the count deviation according to the integer part of the clock deviation.

Optionally, the first adjustment module 75 is further configured to adjust the duration of the preset timer according to the fractional part of the clock deviation to adjust the system time of the first wireless device.

Optionally, the preset timer is a hardware timer.

Optionally, the timing frequency of the preset timer is obtained by the first wireless device according to the system clock frequency. The wireless device 70 may further include:

The third receiving module is configured to receive the radio frequency signal sent by the second wireless device.

The second adjustment module is used to obtain a synchronization signal according to the radio frequency signal, obtain an error signal according to the obtained synchronization signal and the preset synchronization signal, and adjust the system clock frequency according to the error signal.

Optionally, the system clock frequency is obtained by the first wireless device according to the frequency multiplication factor of the phase locked loop and the oscillation frequency of the crystal oscillator.

The second adjustment module is specifically used to adjust the frequency multiplication factor of the phase locked loop according to the error signal to adjust the system clock frequency.

The second adjustment module is specifically used to adjust the oscillation frequency of the crystal oscillator according to the error signal to adjust the system clock frequency.

Optionally, the error signal includes: a time-domain error signal and / or a frequency-domain error signal.

Optionally, the first wireless device and the second wireless device are Bluetooth devices.

Optionally, this application may also provide a wireless device. FIG. 8 is a second schematic structural diagram of a wireless device according to an embodiment of the present application. As shown in FIG. 8, the wireless device 80 can serve as a first wireless device, which can include: a memory 81 and a processor 82. The memory 81 and the processor 82 are coupled.

The memory 81 is used to store program instructions.

The processor 82 is configured to call the program instructions stored in the memory so that the wireless device 80 executes the time synchronization method performed by the first wireless device shown in any of the embodiments corresponding to FIG. 2 to FIG. 6 described above.

An embodiment of the present application may also provide a computer-readable storage medium on which a computer program is stored, which when executed by the processor 82 implements the execution shown in any of the embodiments corresponding to FIG. A time synchronization method performed by the first wireless device.

The device and the computer-readable storage medium provided in the embodiments of the present application can execute the time synchronization method performed by the first wireless device provided in any of the foregoing embodiments. For the specific implementation process and beneficial effects, refer to the above, and will not be described here Repeat.

An embodiment of the present application may further provide a wireless device, and the wireless device may serve as a second wireless device. 9 is a third structural diagram of a wireless device according to an embodiment of the present application. The wireless device may perform the time synchronization method performed by the wireless device described in any one of the foregoing FIGS. 2-6. As shown in FIG. 9, the wireless device 90 may include:

The receiving module 91 is configured to receive a synchronization request signal sent by the first wireless device.

The first sending module 92 is configured to send an ACK signal to the first wireless device when receiving the synchronization request signal; the ACK signal is used to enable the first wireless device to send the synchronization request signal according to the first time, and When the ACK signal is received, the transmission time is determined.

The second sending module 93 is configured to send a synchronization response signal to the first wireless device, the synchronization response signal includes: information of a second time; the second time is the time when the second wireless device receives the synchronization request signal; The second time is used to enable the first wireless device to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.

Optionally, this application may also provide a wireless device. 10 is a fourth structural diagram of a wireless device according to an embodiment of the present application. As shown in FIG. 10, the wireless device 100 may serve as a second wireless device, which may include: a memory 101 and a processor 102. The memory 101 and the processor 102 are coupled.

The memory 101 is used to store program instructions.

The processor 102 is configured to call the program instructions stored in the memory, so that the wireless device 100 executes the time synchronization method performed by the second wireless device shown in any of the embodiments corresponding to FIG. 2 to FIG. 6 described above.

An embodiment of the present application may also provide a computer-readable storage medium on which a computer program is stored, which when executed by the processor 102 implements the execution shown in any of the embodiments corresponding to FIG. 2 to FIG. 6 above A time synchronization method performed by the second wireless device.

The device and the computer-readable storage medium provided by the embodiments of the present application can execute the time synchronization method performed by the second wireless device provided by any of the foregoing embodiments. For the specific implementation process and beneficial effects, refer to the above, which will not be repeated here Repeat.

Those of ordinary skill in the art may understand that all or part of the steps to implement the above method embodiments may be completed by program instructions related hardware. The foregoing program may be stored in a computer-readable storage medium, and when the program is executed, The steps of the above method embodiments are included; and the foregoing storage media include various media that can store program codes, such as ROM, RAM, magnetic disks, or optical disks.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions of the technical solutions of the embodiments of the present application. range.

Claims

A time synchronization method, characterized in that it includes:

The first wireless device sends a synchronization request signal to the second wireless device;

The first wireless device receives an acknowledgement ACK signal sent by the second wireless device;

The first wireless device determines the transmission time according to the first time when the synchronization request signal is sent and the time when the ACK signal is received;

The first wireless device receives a synchronization response signal sent by the second wireless device; the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization request Signal time

The first wireless device adjusts the system time of the first wireless device according to the first time, the transmission time, and the second time.
The method of claim 1, wherein the first wireless device adjusting the system time of the first wireless device according to the first time, the transmission time, and the second time includes:

The first wireless device determines a clock deviation between the first wireless device and the second wireless device according to the first time, the transmission time, and the second time;

The first wireless device adjusts the system time of the first wireless device according to the clock deviation.
The method according to claim 2, wherein the system time of the first wireless device is obtained by the first wireless device according to a preset timer cycle timeout value and a preset count deviation;

The first wireless device adjusting the system time of the first wireless device according to the clock deviation includes:

The first wireless device adjusts the count deviation according to the clock deviation to adjust the system time of the first wireless device.
The method according to claim 3, wherein the clock deviation is a floating point number;

The first wireless device adjusting the count deviation according to the clock deviation includes:

The first wireless device adjusts the count deviation according to the integer part of the clock deviation.
The method according to claim 4, wherein the first wireless device adjusts the system time of the first wireless device according to the clock deviation, further comprising:

The first wireless device adjusts the duration of the preset timer according to the fractional part of the clock deviation to adjust the system time of the first wireless device.
The method according to claim 3, wherein the preset timer is a hardware timer.
The method according to claim 3, wherein the timing frequency of the preset timer is obtained by the first wireless device according to a system clock frequency; the method further includes:

The first wireless device receives the radio frequency signal sent by the second wireless device;

The first wireless device obtains a synchronization signal according to the radio frequency signal;

The first wireless device obtains an error signal according to the obtained synchronization signal and the preset synchronization signal;

The first wireless device adjusts the system clock frequency according to the error signal.
The method according to claim 7, wherein the system clock frequency is obtained by the first wireless device according to a frequency multiplication factor of a phase-locked loop and an oscillation frequency of a crystal oscillator; the first wireless device is based on The error signal adjusting the system clock frequency includes:

The first wireless device adjusts the frequency multiplication factor of the phase locked loop according to the error signal to adjust the system clock frequency.
The method according to claim 7, wherein the system clock frequency is obtained by the first wireless device according to a frequency multiplication factor of a phase-locked loop and an oscillation frequency of a crystal oscillator; the first wireless device is based on The error signal adjusting the system clock frequency includes:

The first wireless device adjusts the oscillation frequency of the crystal oscillator according to the error signal to adjust the system clock frequency.
The method according to any one of claims 7-9, wherein the error signal comprises: a time domain error signal and / or a frequency domain error signal.
The method according to any one of claims 1-9, wherein the first wireless device and the second wireless device are Bluetooth devices.
A time synchronization method, characterized in that it includes:

The second wireless device receives the synchronization request signal sent by the first wireless device;

When receiving the synchronization request signal, the second wireless device sends an acknowledgement ACK signal to the first wireless device; the ACK signal is used to cause the first wireless device to send the synchronization request signal according to the first A time, and the time when the ACK signal is received, determine the transmission time;

The second wireless device sends a synchronization response signal to the first wireless device, the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization request signal The second time is used to allow the first wireless device to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.
The time synchronization method according to claim 12, wherein the first wireless device and the second wireless device are Bluetooth devices.
A wireless device, characterized in that the wireless device is a first wireless device, and the wireless device includes:

A sending module, configured to send a synchronization request signal to the second wireless device;

A first receiving module, configured to receive an acknowledgement ACK signal sent by the second wireless device;

A determining module, configured to determine the transmission time according to the first time when the synchronization request signal is sent and the time when the ACK signal is received;

A second receiving module, configured to receive a synchronization response signal sent by the second wireless device; the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization Request signal time;

The adjustment module is configured to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.
A wireless device, characterized in that the wireless device is a second wireless device, including:

A receiving module, configured to receive a synchronization request signal sent by the first wireless device;

A first sending module, configured to send an acknowledgement ACK signal to the first wireless device when receiving the synchronization request signal; the ACK signal is used to enable the first wireless device to send the synchronization request signal according to the The first time, and the time when the ACK signal is received, determines the transmission time;

A second sending module, configured to send a synchronization response signal to the first wireless device, the synchronization response signal includes: information at a second time; the second time is when the second wireless device receives the synchronization request The time of the signal; the second time is used to allow the first wireless device to adjust the system time of the first wireless device according to the first time, the transmission time, and the second time.
A wireless device, characterized in that the wireless device includes: a memory and a processor; the memory is coupled to the processor;

The memory is used to store program instructions;

The processor is configured to call program instructions stored in the memory, so that the wireless device executes the time synchronization method according to any one of claims 1-11.
A wireless device, characterized in that the device includes: a memory and a processor; the memory is coupled to the processor;

The memory is used to store program instructions;

The processor is configured to call program instructions stored in the memory, so that the wireless device executes the time synchronization method according to claim 12 or 13 above.
A computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the time synchronization method according to any one of claims 1-11 is implemented.
A computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the time synchronization method according to claim 12 or 13 is realized.