91 results about "Network time synchronization" patented technology

The invention relates to the technical field of time synchronization, and provides a parameter-adaptive multi-sensor network time synchronization method and related equipment, and the method comprises the steps: building a clock model based on the deviation and offset of the local time of each sensor relative to the current moment; constructing an updating formula for updating the drift and offset of the local time of each sensor; constructing a time synchronization parameter adaptive model based on the update formula and all the clock models, and solving the time synchronization parameter adaptive model by using an optimization algorithm to obtain an optimal parameter set; updating the drift and the offset of each sensor by using the optimal parameter set and an updating formula to obtain the final drift and the final offset of each sensor at the current moment; and for each sensor, adjusting the local time of the sensor according to the final drift and the final offset of the sensor, so that the local time of all the sensors is synchronized. According to the method, the accuracy of time synchronization can be improved.

The present invention discloses a method and device for transmitting network time synchronization messages applicable to any channel environment, including: classifying the data bits of the time synchronization messages to be transmitted to obtain public information bits and secret information bits, and performing Polar coding on the data of the time synchronization messages to obtain a first coding sequence; dividing all data subcarriers within the transmission bandwidth into sub-blocks according to the number of legitimate receivers, and dividing each sub-block to obtain clusters, performing IM modulation on each cluster to determine the active subcarrier indices of each cluster; interleaving the symbol vector obtained by modulating the first coding sequence based on the total frequency-domain channel matrix characteristics of a preset channel simulation system; modulating the interleaved symbol vector onto the active subcarriers selected for each sub-block to complete OFDM-IM modulation, and sending the modulated OFDM-IM signal to each legitimate receiver. The present invention solves the problems of poor security and limited application scenarios in the transmission of network time synchronization messages.

The invention discloses a network time synchronization method, device and equipment and a computer program product, the network time synchronization method is executed by a network time synchronization system, the network time synchronization system comprises a plurality of network nodes, and each network node is equipped with an independent clock source. The network time synchronization method comprises the following steps: receiving a time signal generated by a clock source on each network node; screening the received time signals generated by each clock source to obtain screened time signals; based on the screened time signals, determining an optimal time reference by using a preset multi-clock combination synchronization algorithm; and correcting a local clock of the network node according to the optimal time reference. Through multi-clock combination and a collaborative synchronization mechanism, high-precision time synchronization can be realized without depending on expensive high-precision hardware, the deployment cost is remarkably reduced, the high performance of the system is ensured, and the system adapts to a complex network environment.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device (WCD) may perform a clock tracking procedure that comprises: transmitting, to an access point (AP), an extended personal area network (XPAN) synchronization message pair that is addressed to a peripheral device associated with the WCD, and receiving, from the AP, an XPAN synchronization response message pair that is associated with the XPAN synchronization message pair. The WCD may transmit, to the AP, user data that is addressed to the peripheral device at a time that is based at least in part on an estimated awake window, the estimated awake window being based at least in part on the XPAN synchronization response message pair. Numerous other aspects are described.

The invention relates to a network time synchronization method, and belongs to the technical field of communication networks. Comprising the steps that a main port vector table is maintained in each node, and the maximum clock drift rate and the maximum clock drift amount of all nodes under each main port are recorded in the table; according to the synchronized state message, each node completes initialization of a main port vector table; when the synchronization moment arrives, the root node updates the main port vector table and selectively sends a synchronization message; the slave node receives the synchronization message, synchronizes the time of the slave node and updates the clock drift rate of the slave node; meanwhile, a state message is replied to the father node along the slave port, and the self clock drift rate is notified; and after each node receives the state message, updating a main port vector table of the node, and selectively notifying the father node. The method solves the problems that in the prior art, extra bandwidth consumption is generated due to the fact that the time synchronization message overhead is large, and the time sensitive service conflicts with the time synchronization signaling message.

The invention discloses a distributed intelligent substation network monitoring system and a network time synchronization method. The monitoring system comprises sensors arranged in a plurality of substations, a data acquisition and processing module, a field monitoring terminal, an execution control mechanism, an industrial personal computer, a display screen, a network communication module, a remote management center and a time synchronization module. The method comprises the following steps: S1, constructing a multi-layer time synchronization network by introducing a plurality of time sources; the PTP time synchronization device is used for time synchronization, network time synchronization is completed by using a timestamp, and high-precision time synchronization is provided; and S2, when the PTP time synchronization device has a fault or the network is unstable. According to the invention, the environmental parameters of the transformer substation and the working parameters of the transformer can be monitored in real time, an accurate data basis is provided for intelligent control of the transformer substation, flexible selection can be realized according to actual conditions, accurate synchronization of system equipment is ensured, and the reliability and stability of system operation are improved.

The embodiment of the invention provides a vehicle-mounted network time synchronization method and device, a storage medium and electronic equipment, and the method comprises the steps: carrying out the synchronization processing of each first slave clock according to a first time synchronization message periodically issued by a master clock, so as to achieve the time synchronization between each first slave clock and the master clock; the main clock is a pre-specified clock node in a time domain; under the condition that the master clock is abnormal, a standby clock is determined as a new master clock, and the standby clock is a pre-specified clock node in a plurality of first slave clocks except the master clock in a time domain; and according to a second time synchronization message periodically issued by the new master clock, performing synchronization processing on each second slave clock, so that time synchronization between each second slave clock and the new master clock is realized. The problem that the starting time of a vehicle-mounted sensitive system is long due to the fact that the new master clock node selection and switching process consumes long time in the related technology is solved.

The invention discloses a sensor network time synchronization method, which comprises the following steps: firstly, clustering and networking sensor nodes according to equipment to which the sensor nodes belong, and for clusters, fusing clock frequency offset between a quantized master control clock signal and a cluster head node into an improved TPSN protocol to dynamically calibrate a logic clock of the cluster head node; and for the interior of the cluster, calibrating the logic clock of the child node in the cluster based on the clock drift amount and the clock offset amount of the cluster head node and the child node in the cluster. According to the method, the characteristics of a power equipment monitoring scene are combined, and a dynamic hierarchical adjustment mechanism and a bidirectional calibration strategy are introduced, so that the time-varying influence of frequency deviation on the synchronization error can be remarkably suppressed, and the adaptability to network topology change is improved.

The invention provides a wireless ad hoc network time synchronization method, device and system and communication equipment, and relates to the technical field of communication. The wireless ad hoc network time synchronization method comprises the following steps: generating a reference clock signal based on a GNSS (Global Navigation Satellite System) signal of a global navigation satellite system; generating a local clock signal synchronized with the reference clock signal; determining a sending window of the wireless frame according to preset sending time slot configuration; wherein the starting moment of the sending window is set to be deviated from a specified edge of the reference clock signal by a preset time delay; generating and sending the wireless frame in the sending window; wherein the wireless frame at least comprises equipment identification information and time synchronization identification information, and the initial sending time of the wireless frame is consistent with the initial time of the sending window.

The invention discloses an offshore wind plant global wave recording management and analysis method and system, and the method comprises the steps: constructing an offshore wind plant global wave recording network which enables each wave recorder of a site to correspond to a collection point, and enabling any collection point to communicate with a wave recording operation and maintenance center; the wave recording operation and maintenance center sends a clock calling command to each wave recorder at a fixed period, network time synchronization is carried out, and a wave recording file after starting each time is managed through a global wave recording index file; based on the global recording index information and the pre-generated element configuration, waveform data of different primary devices are generated, and the abnormal condition of the power system is determined by analyzing the waveform data. Unified time setting and clock management are carried out on the global oscilloscopes, longitudinal fault sequence number management is carried out according to time characteristics of fault occurrence, transverse management is carried out according to starting association conditions of the oscilloscopes in the fault period, a global recording index is formed, power system abnormity can be rapidly positioned, and the manual workload is reduced.

Time synchronization distribution in a network may be provided. Time synchronization may be performed by an Access Point (AP) with a plurality of client devices. Next, based on information received from performing the time synchronization with the plurality of client devices, it may be determined that a first client device of the plurality of client devices is a representative client device. Then, for a predetermined time period, time synchronization with the first client device and not with others of the plurality of client devices may be performed. The data associated with the time synchronization with the first client device may be broadcast to others of the plurality of client devices.

The invention provides a method and a system for time synchronization between network devices. The method comprises the following steps: a first network device sends a request message carrying a first timestamp recorded when a port is out to a second network device; receiving a response message carrying the first timestamp, the second timestamp and the third timestamp from the second network equipment, and recording a fourth timestamp when the response message enters the port; and obtaining a mapping relationship between the first network equipment timestamp and the second network equipment timestamp according to the multiple groups of timestamps. According to the method and the device, the mapping relationship between the timestamps of different devices is obtained by using the least square algorithm according to the multiple groups of timestamps obtained according to the interaction message, and the first network device time corresponding to the timestamp of the second network device is obtained by using the mapping relationship, so that time synchronization can be realized without modifying the timestamps of the devices; the problem that when the network equipment has no absolute timestamp and the timestamp does not support modification, the existing time synchronization protocol cannot be used for time synchronization is solved.

This application discloses a network time synchronization verification method, apparatus, electronic device, and computer-readable storage medium. The method includes: sending probe packets to a time synchronization server at a first preset time interval to obtain a round-trip delay sequence within a preset time window; extracting statistical features from the round-trip delay sequence and constructing a network path fingerprint based on the statistical features; obtaining a time offset change when a time synchronization jump or time synchronization request is detected; calculating the fingerprint deviation of the current network path fingerprint relative to the fingerprint baseline; performing consistency matching between the time offset change and the fingerprint deviation, and determining the reliability of the time offset change based on the consistency matching result. This application can distinguish between interpretable offsets caused by normal network fluctuations and uninterpretable offsets caused by link manipulation when a time synchronization jump occurs in the network time synchronization.

This invention relates to a time synchronization method for 5G and TSN converged networks based on a timestamp compensation algorithm, belonging to the field of cross-network time synchronization. It includes: introducing a 5G network as a TSN virtual bridge into the TSN network to form a cross-network, which includes a TSN1 network, a 5G network, and a TSN2 network. The cross-network uses the TSN switches in the TSN1 network as the master clock and the TSN devices in the TSN2 network as slave clocks. Synchronization is achieved by transmitting time synchronization information step-by-step across the NW-TT module, the 5G network clock domain, and the DS-TT module. The cross-network time synchronization includes TSN2 network time synchronization, 5G network time synchronization, and TSN2 network time synchronization. This invention improves the accuracy of time synchronization by calculating the frequency offset and dwell time between NW-TT and DS-TT within the 5G system and performing time compensation in the DS-TT.

Method (300) for providing fault-tolerant network time synchronization in a motor vehicle communication network (100), wherein the motor vehicle communication network (100) comprises: a video controller (115) coupled with a first camera (110) and a second camera (175), a lidar controller (125) coupled with a first lidar transceiver (130) and a second lidar transceiver (120), a radar controller (145) coupled with a first radar transceiver (140) and a second radar (150), a processor (160), a user interface (165), a vehicle controller (155) and a trailer interface (170) the procedure includes the following: Generation of a time synchronization signal; Transmission of the time synchronization signal from a first switch (415) to a second switch (425) via a first connection and from the first switch (415) to a third switch (435) via a second connection; Detecting a connection error on the second connection; and Transmitting the time synchronization signal from the second switch to the third switch (435) via a third connection in response to the connection fault, wherein the time synchronization signal is generated by a radar controller coupled to the first switch, and wherein a first radar sensor is coupled to the second switch and a second radar sensor is coupled to the third switch, wherein the lidar controller (125), the video controller (115) and the radar controller (145) are each configured to receive and process data from their respective sensors, and the video controller (115) is set up to receive images from the first camera (110) and the second camera (175) and to process the images to generate image data for use in creating an object map around the vehicle (105).

The invention belongs to the technical field of avionics, and particularly relates to an architecture design method of a TSN network end system with dual-processor collaboration. The system architecture comprises a main processor and a network card; a buffer A, a register A, a buffer B, a register B, a coprocessor and a protocol conversion module are arranged in the network card; the main processor performs data interaction with a buffer A and a register A in the network card; the coprocessor performs data interaction with a buffer B and a register B in the network card; the protocol conversion module performs data interaction with the buffer A, the register A, the buffer B, the register B and an external network; the main processor is used for receiving an airborne light thunder signal, a sensor signal, an avionics / electromechanical control signal and a graphic video signal, and outputting light thunder sensor data, an avionics / electromechanical control instruction and a graphic video signal; the coprocessor is used for receiving avionics network management data, network time synchronization data and built-in self-inspection data and outputting corresponding data packets.

The invention discloses a sensor network time synchronization method based on local bidirectional correction and related equipment, relates to the technical field of sensor networks, and solves the problem of high overhead of a bidirectional message time synchronization network. According to the method, the communication range is reduced through local bidirectional correction, and the synchronization hop count is reduced through hierarchical division of a topological structure, so that the network overhead is reduced while the overall time synchronization of the sensor network is realized: the reference nodes are dynamically elected to adapt to the network communication quality change, and the time synchronization accuracy is ensured while the network communication quality is improved. And the robustness of the time synchronization method is improved.

The present invention relates to a cross-network time synchronization method for the fusion of AUTBUS and TSN, and belongs to the field of network time synchronization. It aims to solve the problems that traditional Ethernet cannot meet the needs of time-sensitive applications and the TSN network is limited in scale. The method collects and predicts the delay values ​​of each part in the heterogeneous network by placing a time compensation value prediction algorithm in the AUTBUS terminal, and finally compensates the prediction results to the local clock of the AUTBUS terminal to achieve end-to-end time synchronization of the fusion network of AUTBUS and TSN. The method includes four steps: time synchronization within the TSN network, time synchronization within the gateway, time synchronization within the AUTBUS network, and time compensation of the AUTBUS terminal, and predicts the delay data through a linear regression prediction algorithm to improve synchronization accuracy and efficiency. The present invention is applicable to the fields of intelligent manufacturing, industrial automation, etc., and provides an effective solution for time synchronization of heterogeneous networks.

The invention discloses a method and a system for testing synchronous digital quantity injection of a regional stability control system based on network time synchronization, and the method is characterized in that the method comprises the following steps: S1, determining a test case needed by each control strategy function test of the stability control system according to the architecture and functions of the regional stability control system; s2, based on the test state sequence and the test input quantity determined by the test case, automatically generating a stability control system digital quantity injection test script matched with the test state sequence and the test input quantity; s3, through a network time synchronization mechanism, it is ensured that clock references of the test computer systems of all the sites are consistent, triggering time marks of test cases are set in a unified mode, and generated test case scripts are distributed to stability control devices of all the sites; and S4, analyzing the received test case script by the stability control device of each station, and extracting a test state sequence and characteristic parameters related to the station device.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device (WCD) may perform a clock tracking procedure that comprises: transmitting, to an access point (AP), an extended personal area network (XPAN) synchronization message pair that is addressed to a peripheral device associated with the WCD, and receiving, from the AP, an XPAN synchronization response message pair that is associated with the XPAN synchronization message pair. The WCD may transmit, to the AP, user data that is addressed to the peripheral device at a time that is based at least in part on an estimated awake window, the estimated awake window being based at least in part on the XPAN synchronization response message pair. Numerous other aspects are described.

The invention relates to network time service monitoring equipment and method compatible with NTP and PTP, and belongs to the field of network time service monitoring. The system comprises a power supply module, a mother board module, a monitoring module, a receiver module, a clock module, an NTP monitoring module, a PTP monitoring module and upper computer software. The device is comprehensive in function, high in integration level and wide in application field, high-precision real-time monitoring can be carried out on NTP network time service and PTP network time service at the same time, and the blank in the field is filled. In addition, the mother board module is composed of a plurality of vertical slot positions side by side, different modules can be inserted according to needs, and the number of the NTP monitoring modules and the number of the PTP monitoring modules can be configured.

A repeater device that includes control circuitry that acquires timing information of a base station that is communicatively coupled with the repeater device. The control circuitry further executes network time synchronization with the base station based on the acquired timing information, where the repeater device in a slave mode acts as a slave of the base station based on the network time synchronization. Further, the control circuitry causes the repeater device to function as a remote antenna or a remote radio for the base station in the slave mode.

The utility model relates to a direct current screen with a network time synchronization device and an audible and visual alarm. The direct current screen comprises a direct current screen group, a timer, a network time synchronization module and an audible and visual alarm, the direct current screen group comprises a first direct current screen, a second direct current screen and a third direct current screen; the first direct-current screen, the second direct-current screen and the third direct-current screen are electrically connected in sequence; the timer is electrically connected with the direct-current screen group and records fault time of the first direct-current screen, the second direct-current screen and the third direct-current screen; the network time synchronization module is electrically connected with the timer and used for calibrating the fault time recorded by the timer; the audible and visual alarm is electrically connected with the timer and alarms faults of the first direct current screen, the second direct current screen and the third direct current screen. According to the direct current screen with the network time synchronization device and the audible and visual alarm, the audible and visual alarm and the network time synchronization module are additionally arranged, once the direct current screen breaks down, the audible and visual alarm can give an alarm, and a worker makes a response immediately. When a person arrives at the site, the accurate fault time is obtained through the network time synchronization module, and the fault of the direct current screen is rapidly checked.

The present invention discloses a virtual cluster time synchronization method based on PCIe passthrough, belonging to the technical fields of virtualization and network time synchronization. First, based on the PCIe passthrough technology, the virtual cluster nodes are bound to the underlying clock card to obtain the underlying physical clock time; then, a soft interrupt signal is generated through a timer to enable the virtual nodes to read the clock information of the underlying physical clock card at the same agreed time, while measuring the timer delay and correcting the time read from the clock card in real time; finally, the clock error between the virtual cluster nodes can be obtained by calculating the physical time values of the two clock cards. The present invention utilizes the high-precision hardware of the clock card and, with the help of the PCIe passthrough technology of the virtual machine, can accurately achieve the measurement of system time synchronization between virtual clusters.

This application discloses a clock synchronization method, apparatus, board, and computer-readable storage medium, relating to the field of network time synchronization technology. The service card encapsulates a device sending timestamp in a first NTP request message sent by the main control card based on the first current service system time to obtain a second NTP request message, which is then sent to the NTP server. Based on the second current service system time, the service card encapsulates a device receiving timestamp in a second NTP response message sent by the NTP server to obtain a first NTP response message. The first NTP response message is then sent to the main control card, allowing the main control card to calculate the network clock deviation between itself and the NTP server based on the first NTP response message, and adjust the main control system time accordingly. This method avoids the problem of large errors between the device sending timestamp and the device receiving timestamp, thus ensuring that the network clock deviation calculated by the main control card will not have significant errors.

The application provides a network time synchronization system and method, and belongs to the technical field of network security. The system comprises a sending end and a plurality of receiving ends. Each receiving end is provided with a physical link between the sending end. The sending end is connected with a secure coding modulator. Each receiving end is connected with a secure demodulation decoder. The secure coding modulator and each secure demodulation decoder are provided with a secure transmission auxiliary device. The secure transmission auxiliary device comprises a first end channel simulation subsystem connected with the secure coding modulator, a second end channel simulation subsystem connected with the secure demodulation decoder, a plurality of channel simulation subsystems and a plurality of secure exchange devices located between the first end channel simulation subsystem and the second end channel simulation subsystem. A special communication link is arranged between the secure transmission auxiliary devices. The application realizes the secure transmission of secret information bits in the network time synchronization message, physical layer identity authentication, physical layer routing control and other functions.

The application provides a physical layer identity authentication method and device of a network time synchronization system, and belongs to the technical field of network security, and specifically comprises the following steps: encoding and modulating a sending end original time synchronization message, and inserting an identity authentication pilot sequence; performing pre-distortion of the message signal related to the sending end identity; performing step-by-step equalization of the message signal by each device based on a pre-measured and stored frequency domain channel matrix of a physical channel; a security demodulator extracts a current sub-block identity authentication pilot sequence, estimates, interpolates and stores the pre-distorted sequence, and then performs frequency domain equalization, demodulation and decoding on the current sub-block data sub-carrier by using the pre-distorted sequence to recover the original time synchronization message and a message security indication vector; identity authentication is judged based on the error code rate of the message security indication vector, and the original time synchronization message is sent to a receiving end or discarded according to the judgment. The scheme of the application effectively overcomes external and internal attackers, and realizes time source identity authentication.

The application provides a time synchronization method and device, electronic equipment, storage medium and computer program product, relates to the technical field of network time synchronization, and the method comprises the following steps: receiving a synchronization message sent by a time server; wherein the synchronization message comprises time data; the time data is used for representing the time delay in a communication path; and time synchronization is performed based on the time data and a receiving timestamp of the synchronization message. The scheme in the embodiment of the application can improve network performance.

The present application discloses a method and apparatus for measuring time synchronization traffic and gating configuration in a time-sensitive network. A test adaptation dictionary is generated, which includes test status parameters and test configuration parameters. Among them, a delay value is determined according to the test status parameters and compared with the gating period to meet the condition of no error window. The test adaptation dictionary is retrieved according to the current test status parameters. If the corresponding test configuration parameter set is matched, the configuration is directly sent to the device under test; if not, a new test configuration parameter set needs to be configured, which includes at least one adjustment operation for a certain queue or multiple queues to ensure the isolation of time synchronization traffic and service traffic in the physical time slot. Whether the test passes is judged according to whether the condition of no error window is met. The present application can solve the problem of insufficient test accuracy caused by the occupation of service traffic by time synchronization traffic.

The present invention discloses a network time synchronization system and method supporting high-precision signals. The system includes: the first and second system core switches are respectively connected to the first and second gigabit switches, the first and second dedicated service 10-gigabit switches; the first and second gigabit switches are respectively connected to the primary and standby time synchronization terminals; the primary and standby time synchronization terminals are connected to the service processing server cluster through their respective corresponding primary and standby gigabit switches to form a 32PPS switching subnet; the first and second dedicated service 10-gigabit switches are respectively connected to the service processing server cluster, the first and second signal transceiver subsystem switches to form a service subnet; the first and second signal transceiver subsystem switches are respectively connected to a plurality of data transceiver devices to form a signal transceiver service subnet. The present invention optimizes the physical topology and improves the service processing flow to ensure the real-time performance and reliability of the time synchronization 32PPS signal, providing a strong guarantee for the Beidou satellite service processing.