CN116647304A - A time synchronization method, wireless communication device and system - Google Patents

Abstract

The invention discloses a time synchronization method, wireless communication device and system, and relates to the field of communication. The method includes: the second wireless communication device receives the first time and the first mark sent by the first wireless communication device; the second wireless communication device Generate the second time and the second mark; the second wireless communication device determines the third time when the second wireless communication device sends the pulse signal according to the first time and the transmission delay T1; the second wireless communication device determines the third time according to the second time and the first Calculate the transmission delay T2 at the third moment; the second wireless communication device receives the fourth moment and the updated first mark; the second wireless communication device updates the time state of the second mark according to the updated first mark, and according to the updated Adjust the transmission delay T1 until the first moment is aligned with the fourth moment, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes the first wireless communication Device time synchronization.

Description

A time synchronization method, wireless communication device and system

technical field

The present invention relates to the communication field, and more specifically, it relates to a time synchronization method, wireless communication equipment and system.

Background technique

In wireless communication systems, time synchronization between transceiver devices is often required to achieve strict simultaneous transmission and reception. Wireless communication equipment is used for technical verification with high efficiency and good implementation flexibility, and has been widely used in wireless system development. Analyzing the precise time sending and receiving method of wireless communication equipment is of great significance for the use of wireless communication equipment for technology development and hardware-in-the-loop simulation. Wireless communication equipment is a wireless communication equipment based on the principle of software radio technology (SDR).

Referring to the functional block diagram of the prior art shown in FIG. 1 , the wireless communication device is generally connected to the PC through USB, RJ45, RS232 and the like. The general method is to use NTP time synchronization between PCs, and at the same time, the wireless communication device synchronizes with the PC time, and the wireless communication device sends and receives signals according to the synchronized time.

The time synchronization accuracy of the above-mentioned prior art solution is relatively poor, and cannot meet the simulation and verification requirements of wireless communication equipment applied to a broadband system in TDD mode. This is because using a PC for time synchronization will bring a large time error. On the one hand, whether NTP or PTP is used for time service, although the accuracy is high and can reach the us level, the base point of time synchronization is at the PC end. Time service between PCs, PC time synchronization and then synchronization to wireless communication devices, due to the non-real-time nature of the PC operating system and the time transmission delay between PC and wireless communication devices, there is a large error in the time sending and receiving time of wireless communication devices, Can reach ms level error. On the other hand, the clock precision of the PC is only 10e-4 ~ 10e-5, after a period of time synchronization, the cumulative error can reach the second level. The simulation of wireless systems such as 5G NR, LTE and WLAN systems requires time accuracy to reach the microsecond level, so the existing time synchronization schemes are greatly limited in application.

Contents of the invention

In view of this, the present invention provides a time synchronization method, wireless communication device and system, which are used to realize the time synchronization of transmission and reception between wireless communication devices, avoiding the error caused by using a PC for time synchronization, and also eliminating The error caused by the time synchronization between the PC and the wireless communication device.

Above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

The first aspect of the present application provides a time synchronization method, the method comprising:

The second wireless communication device receives the first time stamp and the first mark carried by the pulse signal sent by the first wireless communication device, wherein the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state;

The second wireless communication device generates a second time stamp and a second mark, wherein the second time stamp indicates the second moment when the second wireless communication device receives the pulse signal, and the second mark indicates that the first wireless communication device is relative to the second wireless communication device. The time state of the device;

The second wireless communication device determines the third time stamp when the second wireless communication device sends a pulse signal to the first wireless communication device according to the first moment and the transmission delay T1, wherein the transmission delay T1 indicates that the second wireless communication device transmits the pulse signal to the first wireless communication device. The time delay of the first software communication device, the third time stamp indicates the third moment when the second wireless communication device sends the pulse signal;

The second wireless communication device calculates the transmission delay T2 from the first wireless communication device to the second software communication device according to the second moment and the third moment;

The second wireless communication device receives the fourth time stamp and the updated first mark carried by the pulse signal sent by the first wireless communication device after receiving the third moment, where the fourth time stamp indicates that the first wireless communication device has received the third For the fourth moment marked by the time stamp, the adjustment of the first mark is made by the first wireless communication device after comparing the time state at the fourth moment with the time state at the first moment;

The second wireless communication device updates the time state of the second mark according to the updated first mark, and adjusts the transmission delay T1 according to the time state indicated by the updated second mark until the first moment is aligned with the fourth moment , so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device.

In one implementation solution, the formula for calculating the third moment is t3=t1-T1, wherein t3 represents the third moment, t1 represents the first moment, and T1 represents the transmission from the second wireless communication device to the first software communication device delay.

The second aspect of the present application also provides a method for time synchronization, including:

The first wireless communication device sends a pulse signal carrying a first time stamp and a first mark to the second wireless communication device, where the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates the first time when the pulse signal is sent by the first wireless communication device. The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state;

The first wireless communication device receives the pulse signal with the third time stamp sent by the second wireless communication device, wherein the third time stamp indicates the third time when the second wireless communication device sends the pulse signal, and the third time is the second wireless communication time Calculated by the device based on the first moment and the transmission delay T1, the transmission delay T1 indicates the delay for the second wireless communication device to transmit to the first software communication device;

The first wireless communication device sends a pulse signal carrying the fourth time stamp and the updated first flag to the second wireless communication device, so that the second wireless communication device delays the transmission by T1 according to the time state indicated by the updated first flag Adjust until the first moment and the fourth moment are aligned, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes the time synchronization of the first wireless communication device, wherein the fourth time stamp indicates that the first The wireless communication device receives the fourth moment marked by the third time stamp, and the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth moment with that of the first moment.

In an implementation solution, the first mark is adjusted after the first wireless communication device compares the time state of the fourth moment with the first moment, specifically: the first wireless communication device compares the fourth moment with the first moment For comparison, it is detected whether the time state of the pulse signal carrying the third time stamp is ahead or behind the time state of the pulse signal carrying the first time stamp, and the first flag is adjusted according to the detection result.

In an implementation solution, the first marker is cyclically adjusted until the adjustment reaches a calibration accuracy value.

The third aspect of the present application provides a time-synchronized wireless communication device, including a processor and a conversion module, and the processor and the conversion module establish a communication connection;

A conversion module, configured to receive a first time stamp and a first mark carried by the pulse signal sent by the first wireless communication device, wherein the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state;

a processor, configured to generate a second time stamp and a second mark, wherein the second time stamp indicates a second moment when the second wireless communication device receives the pulse signal, and the second mark indicates that the first wireless communication device is relative to the second wireless communication device The time state of the device;

The processor is further configured to determine a third time stamp when the second wireless communication device sends a pulse signal to the first wireless communication device according to the first moment and the transmission delay T1, where the transmission delay T1 indicates that the second wireless communication device transmits to the time delay of the first software communication device, the third time stamp indicates the third moment when the second wireless communication device sends the pulse signal;

The processor is further configured to calculate the transmission delay T2 from the first wireless communication device to the second software communication device according to the second moment and the third moment;

The converting module is further configured to receive the fourth time stamp and the updated first mark carried by the pulse signal sent by the first wireless communication device after receiving the third moment, where the fourth time stamp indicates that the first wireless communication device has received the first For the fourth moment marked by the three time stamps, the adjustment of the first mark is adjusted by the first wireless communication device after comparing the time status of the fourth moment with the first moment;

The processor is further configured to update the time state of the second mark according to the updated first mark, and adjust the transmission delay T1 according to the time state indicated by the updated second mark until the first moment and the fourth moment Align, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device.

In one implementation solution, the calculation formula used by the processor at the third moment is t3=t1-T1, where t3 indicates the third moment, t1 indicates the first moment, and T1 indicates that the second wireless communication device transmits to the first moment A transmission delay of a software communication device.

The fourth aspect of the present application provides a time-synchronized wireless communication device, including a processor and a conversion module, and the processor and the conversion module establish a communication connection;

A conversion module, configured to send a pulse signal carrying a first time stamp and a first mark to the second wireless communication device, the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates the second The time state of the wireless communication device relative to the first wireless communication device, where the time state is an advanced state or a lagging state;

The conversion module is further configured to receive a pulse signal carrying a third time stamp sent by the second wireless communication device, wherein the third time stamp indicates a third moment when the second wireless communication device sends the pulse signal, and the third time is the second wireless communication device Calculated by the communication device based on the first moment and the transmission delay T1, the transmission delay T1 indicates the delay for the second wireless communication device to transmit to the first software communication device;

The conversion module is further configured to send a pulse signal carrying the fourth time stamp and the updated first label to the second wireless communication device, so that the second wireless communication device delays the transmission time according to the time state indicated by the updated first label T1 is adjusted until the first moment is aligned with the fourth moment, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes the time synchronization of the first wireless communication device, where the fourth time stamp indicates the first A wireless communication device receives the fourth moment marked by the third time stamp, and the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth moment with the first moment;

A processor for communicating with the conversion module.

In one implementation solution, the processor is further configured to compare the fourth moment with the first moment, and detect that the time state of the pulse signal carrying the third time stamp is compared with the pulse signal carrying the first time stamp Whether the time state of the device is ahead or behind, the first mark is adjusted according to the detection result.

In an implementation solution, the processor is further configured to cyclically adjust the first mark until the adjustment reaches a calibration precision value.

The fifth aspect of the present application also provides a time synchronization system, the system includes the time synchronization wireless communication device described in the third aspect of the application and the time synchronization wireless communication device described in the fourth aspect of the application communication device.

Compared with the prior art, the present invention has the following beneficial effects:

In the time synchronization method provided by the present invention, the time synchronization base point is set at the first wireless communication device and the second wireless communication device, and the first wireless communication device is used as the time base point to provide a reference pulse signal. The second wireless communication device itself also generates a reference pulse signal, which is synchronized with the reference pulse of the first wireless communication device via a wireless signal. The time information of the first PC and the second PC is synchronized with the reference pulse signals of the first wireless communication device and the second wireless communication device respectively. The communication devices are synchronized, so as to realize the time synchronization between the first wireless communication device and the second wireless communication device, which avoids the error caused by using the PC for time synchronization, and also eliminates the gap between the PC and the wireless communication device. The error caused by time synchronization between them.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of the application, and do not limit the embodiments of the present invention. In the attached picture:

Fig. 1 shows the functional block diagram of the time-synchronized wireless communication device and PC of the prior art;

FIG. 2 shows a schematic structural diagram of a time synchronization system provided by an embodiment of the present invention;

FIG. 3 shows a schematic flowchart of a time synchronization method provided by an embodiment of the present invention;

Fig. 4a shows a time chart of sending a pulse signal carrying a first time stamp by a first wireless communication device according to an embodiment of the present invention;

Fig. 4b shows a timing diagram of receiving a pulse signal carrying a first time stamp by a second wireless communication device according to an embodiment of the present invention;

Fig. 4c shows a timing diagram of the second wireless communication device sending a pulse signal carrying a third time stamp according to an embodiment of the present invention;

Fig. 4d shows a timing chart of receiving a pulse signal carrying a third time stamp by the first wireless communication device according to an embodiment of the present invention;

FIG. 5 shows a functional block diagram of time synchronization provided by an embodiment of the present invention;

Fig. 6 shows a schematic flowchart of another time synchronization method provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. As a limitation of the present invention.

It should be noted that the terms "comprising" or "may include" that may be used in various embodiments of the present application indicate the existence of the claimed functions, operations or elements, and do not limit one or more functions, operations or elements. Addition of components. In addition, terms such as "first", "second" and so on are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

The technical solution of the embodiment of the present application can also be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access ( Wideband Code Division MultipleA c c e s s, W C D M A) system, communication system based on Orthogonal Frequency Division Multiplexing (or t h o g o n a l f r eq u en c y d i v i s i o n multiplexing, OFDM) technology, General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (Long Term Evolution) , LTE ) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD), universal mobile communication system (Unive rsa l Mobile Telecommunications unication System, UMTS), wireless fidelity (Wireless Fidelity, WiFi) system, Worldwide Interoperability for Microwave Access (WiMAX) communication system, Wireless Local Area Networks (Wireless Local Area Networks, WLAN) system, Public Land Mobile Network (Public Land Mobile Network, PLMN) network , Vehicle to everything (Vehicle toe v e r y t h i ng, V 2X) system, fifth generation (5t h Gen at i o n, 5G) system, future sixth generation (6t hGeneration, 6G) system or new wireless (New Radio, NR) , optical transmission network, wavelength division network, etc.

It should be understood that the communication method of the embodiment of the present application can be used in application scenarios sensitive to time synchronization or delay, such as automatic or assisted driving, augmented reality (Augmented Reality, AR), virtual reality (Virtual Reality, VR), tactile Internet , industrial control, smart grid (smart grid), real-time game, process automation (Process automation), industrial automation (Factory automation) and other scenarios, which are not limited in this embodiment of the present application.

For example, in industrial control scenarios, time synchronization between controllers and actuators is required. The controller sends a control signal to the actuator, instructing the actuator to execute the command at a certain time. If the executor and the controller have different perceptions of time, that is, the time is not synchronized, it will cause the executor to execute commands at the wrong time, resulting in task execution failure.

In order to better understand the embodiment of the present application, an application scenario used in the embodiment of the present application is firstly described below. In the communication network, different base stations are required to be time synchronized, and the time synchronization accuracy is within the required accuracy. The 1588V2 protocol is used to solve the time synchronization problem between base stations. The receiving-end device and the sending-end device interact through messages carrying timestamps, and the receiving-end device performs time synchronization with the sending-end device according to the timestamp. Specifically, the sending end device sends a synchronization message at time t1, and carries the t1 time stamp indicating time t1 in the synchronization message; the receiving end device receives the synchronization message at time t2, and locally generates a t2 time stamp indicating time t2 on the receiving end device. Timestamp, and extract the t1 timestamp from the synchronization message; the receiving end device sends a delay request message at t3 time, and generates a t3 time stamp indicating the t3 time locally on the receiving end device; the sending end device receives the delay request message at t4 time , and locally generate a t4 time stamp indicating time t4 at the sending end device; the sending end device carries the t4 time stamp in the delayed response message and sends it to the receiving end device; the receiving end device extracts the t4 time stamp from the delayed response message; The receiving end device can calculate the time deviation between the receiving end device and the sending end device according to the obtained time stamps t1, t2, t3 and t4, and adjust the time of the receiving end device itself to achieve time synchronization with the sending end device.

Correspondingly, there is a transmission delay between the sending end device and the receiving end device. When the existing 1588V2 time synchronization calculates the time deviation, it is assumed that Delay1=Delay2, the path delay from the sending end device to the receiving end device and the path from the receiving end device to the sending end device The delays are equal, that is, the transmission and reception link delays are equal; then the calculation formula of the time deviation is further expressed as: N=[(t2-t1)-(t4-t3)]/2.

Since the physical links and wavelengths used for transmitting and receiving link time stamps are often different, it is difficult to achieve the equal delay of sending and receiving links Delay1=Delay2. If the path delay from the sending end device to the receiving end device is not equal to the path delay from the receiving end device to the sending end device, that is, the sending and receiving link delays are not equal, and Delay1≠Delay2 will bring a synchronization error to the size of the time deviation, the synchronization error M =(Delay1-Delay2)/2. In order to achieve high-precision time synchronization, errors caused by unequal delays in the sending and receiving links must be eliminated or reduced.

It should be understood that the time stamp is information indicating the time at which the sending-end device or the receiving-end device stamps its own clock. Timestamps are for example strings or encoded information. The sending-end device and the receiving-end device may be ports, modules, and network devices that need time synchronization. Synchronization messages, delay request messages and delay response messages can be transmitted in the form of packets.

Based on the above content, referring to the functional block diagram of the prior art shown in FIG. 1 , the wireless communication device is generally connected to the PC through USB, RJ45, RS232 and so on. The general method of time synchronization based on the 1588V2 communication protocol is to use NTP time synchronization between PCs, and at the same time, the wireless communication device is synchronized with the PC time, and the wireless communication device sends and receives signals according to the synchronized time.

The time synchronization accuracy of the above-mentioned prior art solution is relatively poor, and cannot meet the simulation and verification requirements of wireless communication equipment applied to a broadband system in TDD mode. This is because using a PC for time synchronization will bring a large time error. On the one hand, whether NTP or PTP is used for time service, although the accuracy is high and can reach the us level, the base point of time synchronization is at the PC end. Time service between PCs, PC time synchronization and then synchronization to wireless communication devices, due to the non-real-time nature of the PC operating system and the time transmission delay between PC and wireless communication devices, there is a large error in the time sending and receiving time of wireless communication devices, Can reach ms level error. On the other hand, the clock precision of the PC is only 10e-4 ~ 10e-5, after a period of time synchronization, the cumulative error can reach the second level. The simulation of wireless systems such as 5G NR, LTE and WLAN systems requires time accuracy to reach the microsecond level. Therefore, the existing time synchronization schemes are greatly limited in the simulation applications of 5G NR, LTE and WLAN systems.

Fig. 2 shows a time synchronization system disclosed in the embodiment of the present application. Optionally, the first communication device and the second communication device in the embodiment of the present application may be a wavelength division device in an optical network, an OTN device, or a node unit in another wavelength division network; the first communication device in the embodiment of the present application The wireless communication device can also be a wireless access network device or node (such as a base station (Base Station, BS), a base station gNB in a 5G mobile communication system, an evolved base station eNodeB, a centralized unit (Centralized Unit, CU), a distributed unit ( Distributed Unit, DU)), the second wireless communication device can also be terminal equipment, user equipment (User Equipment, UE), D2D (Device to Device, D2D) equipment, BS, gNB, eNB, CU, DU; the first wireless communication device The communication device may be the above-mentioned sending-end device, and the second wireless communication device may be the above-mentioned receiving-end device.

As shown in Figure 2, a time synchronization system includes a first communication device 20 and a second communication device 21, wherein the first communication device 20 and the second communication device 21 can be connected by a single-fiber bidirectional optical fiber, and the second The communication device 21 needs to adjust its own clock to achieve time synchronization with the first communication device 20 . The signals sent by the first communication device 20 are all pulse signals of the first wavelength, and the signals sent by the second communication device 21 are all pulse signals of the second wavelength. For the optical signal, the second wavelength signal can be an optical signal with a wavelength of 1510nm based on the 1588 protocol; or the first wavelength signal can also be an optical signal with a wavelength of 1506nm, and the second wavelength signal can also be an optical signal with a wavelength of 1514nm. The optical signals listed in the application are commonly used optical signals, but are not limited thereto, and will not be described redundantly in this embodiment.

As shown in FIG. 3, a time synchronization method applied to a second wireless communication device includes:

S301. The second wireless communication device receives the first time stamp and the first mark carried by the pulse signal sent by the first wireless communication device, where the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first The indicium indicates a time state of the second wireless communication device relative to the first wireless communication device, the time state being an advanced state or a lagging state.

In this embodiment, as shown in FIG. 4a, the first wireless communication device generates a reference pulse signal. At the same time as the reference pulse signal is generated, the first time stamp a_pulseA is marked on the time point of the pulse signal, and the first wireless communication device sends it to the second wireless communication device, and at the same time sends the first flag a_flagA, the first flag a_flagA is used to mark Reference time (the time starting point of the first flag a_flagA may also be used as the first flag a_flagA). The function of the first flag a_flagA is to tell the second wireless communication device whether the time state is ahead or behind relative to the first wireless communication device.

S302. The second wireless communication device generates a second time stamp and a second mark, wherein the second time stamp indicates the second moment when the second wireless communication device receives the pulse signal, and the second mark indicates that the first wireless communication device is relative to the second The temporal state of the wireless communication device.

In this embodiment, as shown in FIG. 4b, the second wireless communication device receives the first time stamp a_pulseA and the first flag a_flagA carried by the pulse signal, and marks them as the second time stamp a_pulseB and the second flag a_flagB respectively.

S303. The second wireless communication device determines the third time stamp when the second wireless communication device sends the pulse signal to the first wireless communication device according to the first moment and the transmission delay T1, where the transmission delay T1 indicates that the second wireless communication device The time delay of transmission to the first software communication device, and the third time stamp indicates the third moment when the second wireless communication device sends the pulse signal.

In this embodiment, as shown in FIG. 4c, the second wireless communication device generates the third time stamp b_pulseB of the pulse signal, and sends the pulse signal to the first wireless communication device, and the second wireless communication device transmits the pulse signal to the first wireless communication device. The transmission delay of the communication device is T1, then the time of the third moment of the third time stamp b_pulseB is the first moment of the first time stamp a_pulseA - T1. The value of T1 is adjusted according to whether the second flag a_flagB is leading or lagging, so as to dynamically adjust the third moment of the third time stamp b_pulseB.

As shown in Figure 4d, the first wireless communication device receives the pulse signal carrying the third time stamp b_pulseB sent by the second wireless communication device, which means that the first wireless communication device receives the pulse signal carrying the third time stamp b_pulseB Mark the fourth time stamp b_pulseA at all times.

S304. The second wireless communication device calculates the transmission time delay T2 for transmission from the first wireless communication device to the second software communication device according to the second time point and the third time point.

S305. The second wireless communication device receives the fourth time stamp and the updated first mark carried by the pulse signal sent by the first wireless communication device after receiving the third moment, where the fourth time stamp indicates that the first wireless communication device has received For the fourth moment marked by the third time stamp, the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth moment with the first moment;

S306. The second wireless communication device updates the time state of the second mark according to the updated first mark, and adjusts the transmission delay T1 according to the time state indicated by the updated second mark until the first moment and the fourth Time is aligned so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device.

In this embodiment, as shown in FIG. 5, the interactive transmission of signals between the first wireless communication device and the second wireless communication device will return to step S301, and the first wireless communication device will record the time indicated by the fourth time stamp b_pulseA Compared with the time indicated by the first time stamp a_pulseA, it is judged whether the time state of the pulse signal is leading or lagging, and the first flag a_flagA is remarked according to the leading or lagging. Subsequent steps from S302 to T306 are executed cyclically. In each signal processing step as shown in FIG. 4c, the second wireless communication device adjusts the sending time marked by the third time stamp b_pulseB according to the second flag a_flagB until the signal processing step in FIG. 4d As shown, the first moment of the first time stamp a_pulseA is aligned with the fourth moment of the fourth time stamp b_pulseA. In this way, the time of the second time stamp a_pulseB marked by the second wireless communication device as shown in FIG. 4b is lagged by T2 compared with the time of the third time stamp b_pulseB. The transmission delay between communication devices is equal to the transmission delay T1 described in step S303 of the embodiment.

Through the method described in the above embodiment, the above steps S301-S306 are repeatedly executed until the calibration value meets the requirements, that is, the transmission delay between the first wireless communication device and the second wireless communication device can be accurately measured, thereby realizing the first Precise synchronization of time between the wireless communication device and the second wireless communication device platform.

Therefore, the embodiment of the present invention proposes a time synchronization method that is ahead or behind between software defined radio platforms (that is, the first wireless communication device and the second wireless communication device). The characteristics of high adjustment accuracy.

It should be understood that the time base is set in the wireless communication device, not on the PC system. Channels (cables or wireless signals) are used between wireless communication devices for transmission.

Optionally, the time state is an advanced state or a lag state. The time state including leading or lagging is a well-known probability for those skilled in the art, so no redundant description is given.

Optionally, the formula for calculating the third moment is t3=t1-T1, where t3 represents the third moment, t1 represents the first moment, and T1 represents the transmission delay from the second wireless communication device to the first software communication device.

As shown in FIG. 6, a method for time synchronization, which is applied to a first wireless communication device, includes:

S601. The first wireless communication device sends a pulse signal carrying a first time stamp and a first mark to the second wireless communication device, where the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark Indicating the time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state;

S602. The first wireless communication device receives a pulse signal carrying a third time stamp sent by the second wireless communication device, where the third time stamp indicates the third time when the second wireless communication device sends the pulse signal, and the third time is the second Calculated by the wireless communication device based on the first moment and the transmission delay T1, the transmission delay T1 indicates the delay for the second wireless communication device to transmit to the first software communication device;

S603. The first wireless communication device sends a pulse signal carrying the fourth time stamp and the updated first flag to the second wireless communication device, so that the second wireless communication device compares the transmission time according to the time state indicated by the updated first flag. The delay T1 is adjusted until the first moment is aligned with the fourth moment, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device, wherein the fourth time stamp indicates The first wireless communication device receives the fourth time marked by the third time stamp, and the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth time with that of the first time.

In one embodiment, the first mark is adjusted after the first wireless communication device compares the time state at the fourth moment with the first moment, specifically: the first wireless communication device compares the fourth moment with the first moment Detecting whether the time state of the pulse signal carrying the third time stamp is ahead or behind the time state of the pulse signal carrying the first time stamp, and adjusting the first flag according to the detection result.

In one embodiment, the first marker is cyclically adjusted until the adjustment reaches a calibrated precision value.

Specifically, in this embodiment, by cyclically adjusting the time state of the first mark, the first wireless communication device compares the time indicated by the fourth time stamp b_pulseA with the time indicated by the first time stamp a_pulseA to detect whether it is ahead or behind, and then The first flag a_flagA flags. The subsequent steps from S301 to S306 are executed cyclically. In each step of S305, the second wireless communication device adjusts the sending time of the third time stamp b_pulseB according to the second flag a_flagB until step S306, so that the first moment a_pulseA and the fourth moment b_pulseA align. In this way, a_pulseB received in the subsequent step 2 is lagging behind b_pulseB by T2, which is basically equal to T1 described above. It can be understood that the calibration accuracy values, namely T1 and T2, are equal.

Based on the time synchronization method applied to the second wireless communication device provided in the above embodiment, this embodiment provides a second wireless communication device with time synchronization, including a processor and a conversion module, and the processor and the conversion module establish a communication connection ;

A conversion module, configured to receive a first time stamp and a first mark carried by the pulse signal sent by the first wireless communication device, wherein the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state;

a processor, configured to generate a second time stamp and a second mark, wherein the second time stamp indicates a second moment when the second wireless communication device receives the pulse signal, and the second mark indicates that the first wireless communication device is relative to the second wireless communication device The time state of the device;

The processor is further configured to determine a third time stamp when the second wireless communication device sends a pulse signal to the first wireless communication device according to the first moment and the transmission delay T1, where the transmission delay T1 indicates that the second wireless communication device transmits to the time delay of the first software communication device, the third time stamp indicates the third moment when the second wireless communication device sends the pulse signal;

The processor is further configured to calculate the transmission delay T2 from the first wireless communication device to the second software communication device according to the second moment and the third moment;

The converting module is further configured to receive the fourth time stamp and the updated first mark carried by the pulse signal sent by the first wireless communication device after receiving the third moment, where the fourth time stamp indicates that the first wireless communication device has received the first For the fourth moment marked by the three time stamps, the adjustment of the first mark is adjusted by the first wireless communication device after comparing the time status of the fourth moment with the first moment;

The processor is further configured to update the time state of the second mark according to the updated first mark, and adjust the transmission delay T1 according to the time state indicated by the updated second mark until the first moment and the fourth moment Align, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device.

Optionally, the calculation formula used by the processor at the third moment is t3=t1-T1, where t3 represents the third moment, t1 represents the first moment, and T1 represents the second wireless communication device transmitting to the first software communication The transmission delay of the device.

Based on the time synchronization method applied to the first wireless communication device in the above embodiment, this embodiment provides a first wireless communication device with time synchronization, including a processor and a conversion module, and the processor and the conversion module establish a communication connection;

A conversion module, configured to send a pulse signal carrying a first time stamp and a first mark to the second wireless communication device, the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates the second The time state of the wireless communication device relative to the first wireless communication device, where the time state is an advanced state or a lagging state;

The conversion module is further configured to receive a pulse signal carrying a third time stamp sent by the second wireless communication device, wherein the third time stamp indicates a third moment when the second wireless communication device sends the pulse signal, and the third time is the second wireless communication device Calculated by the communication device based on the first moment and the transmission delay T1, the transmission delay T1 indicates the delay for the second wireless communication device to transmit to the first software communication device;

The conversion module is further configured to send a pulse signal carrying the fourth time stamp and the updated first label to the second wireless communication device, so that the second wireless communication device delays the transmission time according to the time state indicated by the updated first label T1 is adjusted until the first moment is aligned with the fourth moment, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes the time synchronization of the first wireless communication device, where the fourth time stamp indicates the first A wireless communication device receives the fourth moment marked by the third time stamp, and the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth moment with the first moment;

A processor for communicating with the conversion module.

Optionally, the processor is further configured to compare the fourth moment with the first moment, and detect that the time state of the pulse signal carrying the third time stamp is compared with the time state of the pulse signal carrying the first time stamp Whether it is leading or lagging, the first mark is adjusted according to the detection result.

Optionally, the processor is further configured to cyclically adjust the first mark until the adjustment reaches a calibration precision value.

Based on the time synchronization method of this solution described in the above example, the time calibration accuracy is high, reaching ns level, and compared with the prior art, the accuracy can be increased by more than 100 times.

The above specific implementation manners have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation modes of the present invention, and are not used to limit the protection scope of the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims (10)

1. A time synchronization method, characterized in that the method comprises: The second wireless communication device receives the first time stamp and the first mark carried by the pulse signal sent by the first wireless communication device, wherein the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state; The second wireless communication device generates a second time stamp and a second mark, wherein the second time stamp indicates the second moment when the second wireless communication device receives the pulse signal, and the second mark indicates that the first wireless communication device is relative to the second wireless communication device. The time state of the device; The second wireless communication device determines the third time stamp when the second wireless communication device sends a pulse signal to the first wireless communication device according to the first moment and the transmission delay T1, wherein the transmission delay T1 indicates that the second wireless communication device transmits the pulse signal to the first wireless communication device. The time delay of the first software communication device, the third time stamp indicates the third moment when the second wireless communication device sends the pulse signal; The second wireless communication device calculates the transmission delay T2 from the first wireless communication device to the second software communication device according to the second moment and the third moment; The second wireless communication device receives the fourth time stamp and the updated first mark carried by the pulse signal sent by the first wireless communication device after receiving the third moment, where the fourth time stamp indicates that the first wireless communication device has received the third For the fourth moment marked by the time stamp, the adjustment of the first mark is made by the first wireless communication device after comparing the time state at the fourth moment with the time state at the first moment; The second wireless communication device updates the time state of the second mark according to the updated first mark, and adjusts the transmission delay T1 according to the time state indicated by the updated second mark until the first moment is aligned with the fourth moment , so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device. 2. A method for time synchronization according to claim 1, characterized in that the formula for calculating the third moment is t3=t1-T1, wherein t3 represents the third moment, t1 represents the first moment, and T1 represents the first moment The transmission delay from the second wireless communication device to the first software communication device. 3. A method for time synchronization, characterized in that the method comprises: The first wireless communication device sends a pulse signal carrying a first time stamp and a first mark to the second wireless communication device, where the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates the first time when the pulse signal is sent by the first wireless communication device. The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state; The first wireless communication device receives the pulse signal with the third time stamp sent by the second wireless communication device, wherein the third time stamp indicates the third time when the second wireless communication device sends the pulse signal, and the third time is the second wireless communication time Calculated by the device based on the first moment and the transmission delay T1, the transmission delay T1 indicates the delay for the second wireless communication device to transmit to the first software communication device; The first wireless communication device sends a pulse signal carrying the fourth time stamp and the updated first flag to the second wireless communication device, so that the second wireless communication device delays the transmission by T1 according to the time state indicated by the updated first flag Adjust until the first moment and the fourth moment are aligned, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes the time synchronization of the first wireless communication device, wherein the fourth time stamp indicates that the first The wireless communication device receives the fourth moment marked by the third time stamp, and the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth moment with that of the first moment. 4. A method for time synchronization according to claim 3, characterized in that the adjustment of the first mark is adjusted after the first wireless communication device compares the time state at the fourth moment with that at the first moment, specifically: The first wireless communication device compares the fourth moment with the first moment, and detects whether the time state of the pulse signal carrying the third time stamp is ahead or behind the time state of the pulse signal carrying the first time stamp, The first marker is adjusted according to the detection result. 5 . The method for time synchronization according to claim 4 , wherein the time state of the first marker is cyclically adjusted until the adjustment reaches a calibration precision value. 6 . 6. A time-synchronized wireless communication device, characterized in that it includes a processor and a conversion module, and the processor and the conversion module establish a communication connection; A conversion module, configured to receive a first time stamp and a first mark carried by the pulse signal sent by the first wireless communication device, wherein the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates The time state of the second wireless communication device relative to the first wireless communication device, the time state is an advanced state or a lagging state; a processor, configured to generate a second time stamp and a second mark, wherein the second time stamp indicates a second moment when the second wireless communication device receives the pulse signal, and the second mark indicates that the first wireless communication device is relative to the second wireless communication device The time state of the device; The processor is further configured to determine a third time stamp when the second wireless communication device sends a pulse signal to the first wireless communication device according to the first moment and the transmission delay T1, where the transmission delay T1 indicates that the second wireless communication device transmits to the time delay of the first software communication device, the third time stamp indicates the third moment when the second wireless communication device sends the pulse signal; The processor is further configured to calculate the transmission delay T2 from the first wireless communication device to the second software communication device according to the second moment and the third moment; The converting module is further configured to receive the fourth time stamp and the updated first mark carried by the pulse signal sent by the first wireless communication device after receiving the third moment, where the fourth time stamp indicates that the first wireless communication device has received the first For the fourth moment marked by the three time stamps, the adjustment of the first mark is adjusted by the first wireless communication device after comparing the time status of the fourth moment with the first moment; The processor is further configured to update the time state of the second mark according to the updated first mark, and adjust the transmission delay T1 according to the time state indicated by the updated second mark until the first moment and the fourth moment Align, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes time synchronization with the first wireless communication device. 7. A time-synchronized wireless communication device, characterized in that it includes a processor and a conversion module, and the processor and the conversion module establish a communication connection; A conversion module, configured to send a pulse signal carrying a first time stamp and a first mark to the second wireless communication device, the first time stamp indicates the first moment when the first wireless communication device sends the pulse signal, and the first mark indicates the second The time state of the wireless communication device relative to the first wireless communication device, where the time state is an advanced state or a lagging state; The conversion module is further configured to receive a pulse signal carrying a third time stamp sent by the second wireless communication device, wherein the third time stamp indicates a third moment when the second wireless communication device sends the pulse signal, and the third time is the second wireless communication device Calculated by the communication device based on the first moment and the transmission delay T1, the transmission delay T1 indicates the delay for the second wireless communication device to transmit to the first software communication device; The conversion module is further configured to send a pulse signal carrying the fourth time stamp and the updated first label to the second wireless communication device, so that the second wireless communication device delays the transmission time according to the time state indicated by the updated first label T1 is adjusted until the first moment is aligned with the fourth moment, so that the transmission delay T1 is equal to the transmission delay T2, and the second wireless communication device completes the time synchronization of the first wireless communication device, where the fourth time stamp indicates the first A wireless communication device receives the fourth moment marked by the third time stamp, and the adjustment of the first mark is adjusted after the first wireless communication device compares the time status of the fourth moment with the first moment; A processor for communicating with the conversion module. 8. A time-synchronized wireless communication device according to claim 7, wherein the processor is further configured to compare the fourth moment with the first moment, and detect the pulse signal carrying the third time stamp. The first mark is adjusted according to the detection result whether the time state is ahead or behind the time state of the pulse signal carrying the first time stamp. 9. The time-synchronized wireless communication device according to claim 8, wherein the processor is further configured to cyclically adjust the first mark until the adjustment reaches a calibration accuracy value. 10. A time synchronization system, characterized in that the system comprises the time synchronization wireless communication device according to claim 6 and the time synchronization wireless communication device according to any one of claims 7 to 9.