165 results about "Precision Time Protocol" patented technology

The invention discloses a fault root cause positioning method and system for a server cluster, and relates to the technical field of network fault diagnosis. According to the method, nanosecond-level synchronous acquisition of micro-service call chains, container indexes, physical nodes and network data is realized through a precise time protocol, and a consistent data set is constructed through entity association and standardized processing; a service-resource topological graph is dynamically constructed, and an inter-service calling edge weight model is innovatively designed: a real-time load factor and a historical fault index attenuation sum processed by a Sigmoid function are fused, and the weight is periodically updated to accurately quantify the inter-node influence intensity; converting the topological graph into a Bayesian network; when a fault occurs, a three-level assembly line compression alarm is adopted, frequent item sets are mined through bitmap indexes and parallel FP-Growth, and strong causal association item sets are screened in combination with topological edge weights and KL divergence; strong causal alarm is taken as evidence, probabilistic root cause sorting is output through reverse random walk sampling, and high-precision positioning of complex distributed system faults is achieved.

The invention discloses a method for realizing data acquisition clock synchronization through Beidou time service and an FPGA phase-locked loop, and the method comprises the steps: obtaining a short message service signal of a Beidou satellite navigation system, and carrying out the analysis to obtain time service information; controlling a digital phase-locked loop to calibrate a local clock signal according to the time service information; monitoring the deviation between the time service information and the local clock signal, and adjusting the frequency and phase of the local clock signal through feedback control of the digital phase-locked loop; monitoring a clock synchronization state, setting a clock deviation threshold value, judging the synchronization state of the time service information and the local clock signal, if the deviation exceeds a threshold value range, triggering an alarm signal, and taking a recovery measure according to an abnormity type and duration time; a hardware timestamp function is integrated, clock synchronization with other acquisition nodes is carried out through a precise time protocol, and the acquisition time of seismic data is recorded.

A method and a network device are disclosed for precision time protocol (PTP) clock synchronization. According to an embodiment, the network device determines whether the network device is in one of a first state where a reception of an announce message from a PTP clock source is interrupted due to a local change at the network device, and a second state where the PTP clock source is restored after a predetermined restoration time, or the reception of the announce message from the PTP clock source is recovered after the local change. When determining that the network device is in one of the first state and the second state, the network device uses the PTP clock source as a candidate PTP master, without waiting for the predetermined restoration time.

An apparatus and method for time synchronization in 5th generation (5G) networks are presented. Time sync Reference Unit (TRU) instances are used to calculate synchronization deltas between Radio Units (RUs) and Distributed Units (DUs) and time offsets between antennas of an RU. Time synchronization data are collected from the antennas with reference signals synchronized using precision time protocol (PTP) signals, deltas calculated, and averaged to determine a synchronization offset that is applied to adjust the timing of the RUs and DUs. An artificial intelligence (AI) model is used to process timing data, accounting for environmental and network variables. The synchronization offsets are published for application adjustments, and feedback is collected to refine the AI model and enhance future synchronization accuracy.

The invention relates to the technical field of edge computing, and discloses an edge computing intelligent decision-making system based on edge cloud collaboration, which comprises a terminal sensing layer, an edge computing layer, a network transmission layer and a cloud center layer. The terminal sensing layer is configured to collect original data; the edge computing layer comprises edge computing equipment, a resource scheduling module and a distributed synchronous triggering module which are respectively used for data preprocessing and model reasoning, dynamic resource allocation based on multi-agent deep reinforcement learning and multi-equipment synchronous acquisition realized through a precision time protocol; the network transmission layer dynamically adjusts a transmission strategy based on a reinforcement learning algorithm during data transmission; and the cloud center layer carries out training optimization on the model through a federal learning mechanism and issues the model to an edge side. According to the method, millisecond-level real-time intelligent decision making of an industrial site and sustainable evolution of the AI model are realized through a side cloud collaborative architecture, and the efficiency, the reliability and the self-adaptive capability of the system are effectively improved.

The invention provides a dynamic high-precision PTP (Precision Time Protocol) time synchronization system realized based on an FPGA (Field Programmable Gate Array), which comprises a master device and a slave device, and the master device and the slave device are connected through a PHY (Physical Layer) to carry out PTP time synchronization; the master device and the slave device have the same structure and comprise an FPGA and a voltage-controlled crystal oscillator; in the master device, the FPGA obtains the frequency difference and the phase difference between the master device and an externally input reference source, further adjusts the frequency of a voltage-controlled crystal oscillator, corrects a local time mark, and sends a PTP message to the slave device; and in the slave equipment, the FPGA obtains the frequency difference and the phase difference between the slave equipment and the master equipment based on the received PTP message, so that the frequency of the voltage-controlled crystal oscillator is adjusted, and the local time scale is corrected. According to the invention, low-cost and high-precision PTP time synchronization is realized.

The invention discloses a foundation pit support deformation real-time monitoring method based on edge calculation, and aims to solve the problems of multi-node time synchronization and clock drift compensation caused by unavailability or poor quality of satellite navigation and precise time protocols in an underground or shielded environment. According to the method, through event dictionary learning, partition time slot scheduling and safety coding micro excitation time synchronization, matched filtering decoding, multi-scale arrival time estimation, paired time difference robust fusion, frequency priority and phase speed limit correction and network disconnection time holding, the time synchronization efficiency is improved; the technical effects that multi-source data alignment, deformation field reconstruction and graded early warning are completed on the unified virtual reference time scale, and high-precision synchronization and online drift compensation are obtained without depending on the external time service condition are achieved.

The precision time protocol (PTP) runs on the peer switches in an MLAG domain. PTP messages received by one peer switch on an MLAG interface is selectively peer-forwarded to the other peer switch on the same MLAG interface in order to coordinate a synchronization session with a PTP node. The peer-forwarded messages inform one peer switch to be an active peer and the other peer switch to be an inactive peer so that timestamped messages during the synchronization session are exchanged only between the PTP node the active peer, and hence take the same data path.

A network device may identify a link aggregation group (LAG) of a plurality of links between the network device and another network device. The network device may identify link aggregation control protocol (LACP) parameters that were communicated by the network device and the other network device in association with the LAG. The network device may determine, based on the LACP parameters, a priority order of the plurality of links in the LAG. The network device may communicate with the other network device, and based on the priority order of the plurality of links of the LAG, one or more precision time protocol (PTP) messages via the LAG. For example, the network device may determine that a first link and a second link in the priority order are not available, and therefore may communicate the one or more PTP messages via a third link in the priority order.

The invention relates to the technical field of Ethernet communication and digital information transmission, and discloses an Ethernet-based time synchronization acquisition method, device and equipment and a medium, and the method comprises the steps: obtaining initial network time based on a network time protocol and a precise time protocol; recovering the synchronous clock signal from the Ethernet physical layer signal and generating a trigger pulse signal aligned with a second boundary to generate second-level reference time; the trigger pulse signal and the synchronous clock signal are used for executing high-frequency counting accumulation to generate nanosecond-level fine time; performing frequency division processing on the synchronous clock signal based on the sampling rate configuration parameter to obtain a sampling driving clock; the analog-to-digital conversion unit is triggered at the effective jump edge of the sampling driving clock to sample and latch nanosecond-level fine time to generate a sampling timestamp, and the sampling timestamp is output in combination with sampling data. According to the method, time recovery, time refinement and sampling time locking are realized through a unified time base, so that sampling action and time counting are accurately aligned, and the data synchronization precision and consistency of distributed acquisition nodes are improved.

The invention relates to the field of fan spindle state monitoring, and aims at synchronously acquiring sound and vibration signals through multiple channels, realizing nanosecond time alignment by adopting a precision time protocol, and performing denoising and normalization preprocessing on the signals to improve data integration and signal fidelity. Furthermore, short-time Fourier transform and continuous wavelet transform are combined to extract multi-scale time-frequency features, and a high-dimensional combined feature vector is generated in combination with cross-correlation analysis. And mapping the feature vectors to a low-dimensional manifold space through a local linear embedding algorithm, and constructing a dynamic mode reference template. Indexes such as curvature, track length and direction entropy are monitored in real time, whether the spindle has an abnormal evolution trend or not is judged through a self-adaptive curvature threshold, and abnormity judgment is achieved in combination with track backtracking verification. According to the scheme, the abnormal starting boundary of the spindle state can be caught in a refined mode, and the early warning and operation and maintenance response capacity of fan operation is effectively improved.

The redundant streaming system based on synchronization of the multiple encoders and the time codes comprises the multiple encoders, a time code synchronization module, a redundant node cluster, a self-adaptive switching controller and a distributed storage module. The encoder forms and outputs a data frame containing a unique position code. The time code synchronization module generates a global timestamp based on a precision time protocol, and embeds the global timestamp into a data frame of the encoder to achieve spatio-temporal alignment of the data frame and a global clock. The redundant node cluster configures a dynamic bandwidth adjustment module from the nodes to adaptively match the phase-locked loop bandwidth according to the network delay. The adaptive switching controller monitors node states. The distributed storage module divides the data in a segmented mode based on the global timestamp, and redundant copies are generated for the data in the key time window. According to the redundant streaming system based on synchronization of the multiple encoders and the time codes, the problem that an encoder synchronization mechanism highly depends on physical signals can be solved.

The invention provides a vehicle-mounted time synchronization method and device, and the method is applied to a vehicle-mounted network, and comprises the steps: obtaining the topology of the vehicle-mounted network, and determining a master clock and slave equipment according to the topology of the vehicle-mounted network; wherein the master clock and the slave device are connected through a network interface supporting a precise time protocol; broadcasting a synchronization message to the slave device through a preset frequency by using the master clock, wherein the synchronization message at least comprises a first timestamp of a moment when the synchronization message leaves the master clock through the network interface; receiving the synchronization message by using the slave device, and determining a second timestamp of the moment when the synchronization message reaches the slave device through the network interface; and pre-determining propagation delay, determining clock skew of the slave device according to the first timestamp, the second timestamp and the propagation delay, and synchronizing a local clock of the slave device according to the clock skew. The synchronization delay is avoided, and the time synchronization efficiency is improved.

The invention discloses a fault recognition method and system for an aero-engine, and belongs to the technical field of aero-engine maintaining.The fault recognition method and system for the aero-engine comprise the following specific steps that firstly, sensors are deployed at key positions of the aero-engine, and the sensors are stored in the key positions of the aero-engine through an I EEE 1588 precise time protocol; timestamps are made on the data of each sensor through the airborne switch; 2, preprocessing the data collected by the sensor, and then extracting features; according to the method, the comprehensive accuracy is greatly improved through multi-source data fusion and an attention mechanism, the early fault detection capability is improved, the cross-channel attention mechanism enables the model to automatically enhance the anti-interference signal weight in a high-temperature and high-vibration environment, the false early warning probability is reduced, the reasoning delay of an edge-side lightweight model is reduced, and the accuracy of the model is improved. And the end-to-end system delay is reduced, and the aviation-level real-time standard is met.

The invention discloses an automobile cabin software control method and system based on multi-mode interaction, and relates to the field of multi-mode data, and the method comprises the steps: S1, multi-source signal synchronous collection and timestamp calibration; a user voice instruction, a gesture track and eye fixation point information are collected in real time through a distributed sensor array; according to sensor data, a three-level synchronization architecture is combined with a PTP precise time protocol to achieve microsecond-level clock synchronization, a unified time service timestamp is embedded in a data packet header, and the timestamp error is controlled within + / -0.5 ms; s2, dynamic environment interference compensation; the method comprises the following steps: constructing an environmental noise perception model; the construction of the environmental noise perception model comprises the following steps: starting a regional strong light suppression algorithm for a strong light scene with the illumination intensity greater than 10,000 lux; activating a motion compensation module for a bumpy scene with a vertical acceleration greater than 0.3 g, and outputting an environment compensation multi-modal data stream; s3, analyzing time-space association semantics; and S4, confidence decision and instruction execution.

The invention discloses a time sequence synchronization method and system for data fusion of a multi-modal wearable sensor, a terminal and a storage medium. The method comprises the following steps: acquiring an absolute timestamp as a global clock source; taking the global clock source as a master clock of a precision time protocol, configuring the plurality of wearable sensors as slave clocks, and executing multiple rounds of message interaction between the master clock and the slave clocks through the precision time protocol to obtain a timestamp corresponding to each round of interaction; and calculating the current path time delay and the current clock offset according to the corresponding timestamps, carrying out iterative judgment on the current path time delay and the current clock offset according to a preset path time delay threshold value and a preset clock offset threshold value, and determining whether to correct the local clock according to the current clock offset according to an iterative judgment result. The slave clock and the global clock source achieve time sequence synchronization; and after time synchronization is achieved, phase alignment is carried out on the periodic data sampling tasks of the multiple wearable sensors. According to the invention, the time sequence synchronization precision is obviously improved.

Aspects of the subject disclosure may include, for example, a device, including: a processing system including a processor; a clock; and a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations of: advertising via Border Gateway Protocol (BGP) a capability as a precision timing protocol (PTP) master clock through an Internet Protocol (IP) / Multi-Protocol Label Switching (MPLS) network, wherein the advertising includes an IP address of the device; receiving a unicast signaling mechanism from a PTP client node in the network; and sending clock messages to the PTP client node responsive to accepting the PTP client node. Other embodiments are disclosed.

Network device capable of acting as precision time protocol (PTP) master and method performed thereby are disclosed. According to an embodiment, the network device comprises or is connectable with a global navigation satellite system (GNSS) receiver for receiving a pulse timing signal. The network device comprises a signal controller and a synchronization unit. The signal controller is configured to detect whether the received pulse timing signal is in abnormal status, to generate and provide a normal pulse timing signal to the synchronization unit within a predetermined time period in response to detecting the received pulse timing signal to be in abnormal status, and to provide the received pulse timing signal to the synchronization unit in response to detecting the received pulse timing signal to be not in abnormal status. The synchronization unit is configured to synchronize with the generated normal pulse timing signal or the received pulse timing signal.

The invention discloses a time synchronization method, a time synchronization system and a storage medium, and the method comprises the steps: receiving and fusing multi-source time signals at the same time, and obtaining a local time reference signal; calculating the frequency compensation amount of a local clock source in real time based on an LSTM model trained by using a local time reference signal; detecting whether the time signal is available, and determining to switch an atomic clock taming mode or a timekeeping mode based on a detection result; inserting a timestamp with femtosecond precision for the initial data message through the PIC to obtain a target data message; and sending the time synchronization information and the target data message to a 6G network node through a precision time protocol of the FPGA chip. According to the invention, on the basis that the satellite signal is taken as a time reference, two conditions that the satellite signal is available and unavailable are considered, and a local clock source and photon time service are adjusted in combination with a multi-source satellite signal fusion result, so that the time synchronization precision is improved, and the 6G network requirement is met.

Integrated circuit devices, methods, and circuitry for a virtual time of day (ToD) engine to generate timestamps by using offsets associated with PTP clock domains. An integrated circuit device may include a number of ports configurable to communicate using timestamps corresponding to a number of Precision Time Protocol (PTP) clock domains. The integrated circuit device may also include a host data processing system to determine an offset for a first PTP clock domain of the plurality of PTP clock domains by calculating a difference between a first ToD provided by a clock source on the integrated circuit and one or more ToDs associated with the first PTP clock domain. The integrated circuit may further include a virtual ToD engine to generate a timestamp by adding the offset for the first PTP clock domain to a second ToD from the clock source and provide the timestamp to a port.

Methods and network devices are disclosed for precision time protocol (PTP) clock synchronization. According to an embodiment, there is a link aggregation group (LAG) between a first network device acting as a PTP slave and a second network device acting as a PTP master. The first network device obtains, for a first LAG member of the LAG acting as a first path from the PTP master to the PTP slave in an exchange of PTP messages for clock synchronization, a delay value reflecting an additional propagation delay of the first LAG member relative to a reference LAG member of the LAG. The first network device obtains, for a second LAG member of the LAG acting as a second path from the PTP slave to the PTP master in the exchange of the PTP messages, a delay value reflecting an additional propagation delay of the second LAG member relative to the reference LAG member. The first network device compensates an asymmetry between propagation delays of the first path and the second path, based on the delay value of the first LAG member and the delay value of the second LAG member.

The embodiment of the invention provides a differential relay protection device, equipment, system and method and a storage medium, the differential relay protection device comprises a clock module, the clock module is configured to create a first clock for the differential relay protection device, the first clock is configured in a precision time protocol domain, and the clock module is configured to create a second clock for the differential relay protection device, the second clock is configured in a precision time protocol domain; the second clock and the first clock operate independently; a power data obtaining module configured to obtain power data collected based on a second clock; and a processing module configured to perform a differential relay protection function through the first clock. According to the differential relay protection device disclosed by the invention, an independent precise time protocol domain can be configured for a differential relay protection function, so that power data synchronization is realized in a mode of low hardware cost, low system framework complexity, high flexibility and high operation stability, and the differential relay protection function is realized.

A time synchronization method used for a time synchronization device is provided. The time synchronization device runs a plurality of Precision Time Protocol (PTP) instances to connect to a plurality of time synchronization domains through a plurality of ports. The time synchronization method includes selecting a grandmaster (GM) clock from the plurality of time synchronization domains; updating clock information of the grandmaster clock; determining whether each of the plurality of ports is a time receiving port or a time transmitting port according to the grandmaster clock; modifying clock attributes of each of the plurality of PTP instances according to whether the corresponding port is the time receiving port or the time transmitting port; and synchronizing, by the plurality of PTP instances, timings of the plurality of time synchronization domains according to the grandmaster clock.

The invention relates to a time synchronization method and device, switching equipment and a computer readable storage medium. The method is applied to a switching chip in switching equipment. The precise time protocol domain where the switching equipment is located comprises adjacent equipment of the switching equipment; the method comprises the following steps: acquiring clock mode data; under the condition that the clock mode data represents a point-to-point transparent clock, assigning a path delay amount between the switching equipment and adjacent equipment to a point-to-point delay parameter corresponding to the adjacent equipment; under the condition that the clock mode data represents the end-to-end transparent clock, the point-to-point delay parameter is set to be zero; receiving a synchronization protocol frame sent by adjacent equipment, and determining a receiving timestamp; updating a correction domain in the synchronization protocol frame according to the point-to-point delay parameter; forwarding the synchronization protocol frame, and determining a sending timestamp; before the correction domain is forwarded, the correction domain is updated according to a difference between the transmit timestamp and the receive timestamp. By adopting the method, the precision of time synchronization can be ensured.

Industrial devices and edge compute platforms are configured to synchronize their internal clocks to provide a common sense of time across application and data acquisition tasks, thereby allowing for an inherent common understanding of time across the devices and data sets. The industrial devices can synchronize their internal clocks using Precision Time Protocol (PTP) or IEEE 802.1AS synchronization. The accurate time stamping achieved by this synchronization can yield more accurate analysis of data sets acquired from multiple devices, and greater fidelity and synchronization between a digital twin of an automation system and the physical system represented by the digital twin.

The application discloses a kind of big data driven wind power assembly repeated quality intelligent determination method and system.Method includes setting sensor, automation equipment and environmental monitoring instrument in wind power assembly station, obtains multidimensional original data through edge computing node, realizes data alignment with precision time protocol, is converted into unified structured data stream and carries out denoising, and outputs the assembly signal data after denoising;Establish data infrastructure layer including distributed storage and containerization arrangement;Assembly signal data is processed, and time domain, frequency domain and time-frequency domain features are extracted, combined with environmental and equipment state parameters to construct assembly quality feature vector, process using quality determination model, calculate Mahalanobis distance and compare with preset threshold value, process drift is judged by Mann-Kendall test.The application can effectively identify the repeatability quality defects and process drift in wind power assembly, improve assembly quality consistency.

A network device includes control logic coupled to a receiver. The control logic detects an synchronization packet received via the receiver from a second network device over a network that is precision time protocol unaware. The control logic determines that a portion of the synchronization packet is asserted, indicating that the synchronization packet has incurred congestion traversing the network. The control logic adjusts, based on an assertion of the portion, a weight applied to timestamps associated with sending and receiving the synchronization packet in performing clock synchronization with the second network device.

The present disclosure describes a system, and a method to improve the system performance through hardware offload of a Best Master Clock Algorithm (BMCA). The system comprising at least one hardware entity integrated with a primary BMCA. The at least one hardware entity is configured to receive a plurality of Precision Time Protocol (PTP) masters from a plurality of PTP master clocks. Thereafter, the at least one hardware entity is configured to select a PTP master as a best PTP master from the plurality of PTP masters using the primary BMCA in the at least one hardware entity and transmit the best PTP master to a second entity for synchronizing a slave clock.

The invention discloses a method for smoothly switching a clock input source, an electronic device and a storage medium, and the method comprises the steps: selecting a precision time protocol (PTP) input source according to initial configuration, and carrying out the time synchronization; judging whether the pulse signal of the PTP input source within T time is normal or not; if the pulse signal of the PTP input source in the T time is normal, locking the PTP input source; and dynamically adjusting an OCXO (Oven Control Crystal Oscillator) input source according to the PTP timestamp of the PTP input source so as to carry out calibration, so that the pulse signal of the OCXO input source follows the pulse signal of the PTP input source.

This application relates to the field of communication technologies, and discloses a clock synchronization assurance method and an apparatus, to ensure clock synchronization between a terminal device and a user plane function network element when a clock of an access network device that provides timing for the terminal device is not synchronized with a clock of the user plane function network element. The method includes: A clock management network element receives a generalized precision time protocol gPTP clock synchronization request from an application function network element, where the gPTP clock synchronization request includes an identifier of a target user plane function network element and an identifier of a target terminal device. The clock management network element obtains a clock offset between the target user plane function network element and a target access network device when a clock of the target user plane function network element is not synchronized with a clock of the target terminal device, where the target access network device is an access network device providing timing for the target terminal device. The clock management network element sends the clock offset to the target user plane function network element or the target terminal device, where the clock offset is used by the target access network device or the target terminal device for clock synchronization.