24 results about "Timing Synchronization Function" patented technology

The invention discloses a lightweight spliced bridge vibration monitoring system for cooperative work performance intelligent perception, and belongs to the technical field of bridge structure health monitoring, and the lightweight spliced bridge vibration monitoring system comprises a lightweight targeted sensing subsystem which comprises a plurality of perception assemblies arranged in a targeted manner; the intelligent edge acquisition and transmission subsystem has an independent addressing function and a time synchronization function and is used for preprocessing and lightweight processing; the cloud edge collaborative storage management subsystem performs hierarchical storage, security control and efficient retrieval on the data to form monitoring data; and the cooperative performance perception early warning subsystem realizes state evaluation and graded early warning of the cooperative work performance of the spliced bridge through multi-index fusion. By adopting the lightweight spliced bridge vibration monitoring system for cooperative work performance intelligent perception, the problems of insufficient lightweight and targeting performance, low data processing, transmission and storage efficiency, and inaccurate cooperative performance evaluation, damage positioning and early warning of traditional spliced bridge vibration monitoring are solved.

The invention relates to a time synchronization system and method of a TSN train communication network. The system comprises a backbone network clock domain, a marshalling network clock domain and an intermediate clock domain formed by connecting backbone network nodes and marshalling network nodes, the two backbone network clock domains receive the same external clock source through each autonomous clock node to realize time synchronization, and provide a unified time reference for each marshalling network clock domain; under the condition that the time synchronization of the clock domain of the backbone network is abnormal or invalid, the backbone network node sends a synchronization abnormal signal to the marshalling network node of the intermediate clock domain where the backbone network node is located; the marshalling network clock domain is used for realizing time synchronization of equipment supporting the TSN in the marshalling network; under the condition that the synchronization abnormal signal is received, the marshalling network node of the middle clock domain does not enable the time synchronization function, so that the backbone network clock domain is isolated from the marshalling network clock domain where the marshalling network node is located. The problem that large-area synchronization abnormity of the whole vehicle may be caused once the time synchronization of the backbone network fails is solved.

A communication method and a communication apparatus are provided. According to the method, a time synchronization function network element may obtain an identifier of a serving access management network element of a terminal device, and may further determine whether a target access management network element set includes the serving access management network element of the terminal device. In this way, when determining that the target access management network element set includes the serving access management network element of the terminal device, the time synchronization function network element subscribes to, from the serving access management network element of the terminal device, whether a location of the terminal device is in a coverage area of a time synchronization service, to avoid initiating unnecessary subscription. The target access management network element set includes an access management network element that serves a TA in the coverage area of the time synchronization service.

The application discloses an unmanned aerial vehicle communication network intelligent cooperative switching system for suppressing multi-station interference, and belongs to the technical field of wireless communication networks.The technical problem to be solved by the application is how to actively avoid or reduce the same-frequency interference of unmanned aerial vehicles when communicating in the overlapping area of multiple ground stations, realize stable and efficient seamless switching, and improve the spectrum utilization and communication reliability of the whole network.The technical scheme adopted is as follows: the system comprises a synchronous ground station group, a network cooperative controller and an intelligent unmanned aerial vehicle terminal.The synchronous ground station group is the infrastructure of the communication network formed by multiple ground stations with time synchronization function, and each ground station has interference measurement and reporting functions.The network cooperative controller is used for acquiring global information including the position information of the intelligent unmanned aerial vehicle terminal and the network information of the subnetwork where the intelligent unmanned aerial vehicle terminal is located in real time, and constructing a network topology connection graph by using the global information, and dynamically constructing and maintaining a network interference relationship graph.

The invention provides a method and a system for testing a priority time checking function of a power distribution terminal. The method comprises the following steps: a clock server performs time service on a state quantity generator, establishes a communication link between a test master station and the power distribution terminal, enables a remote signaling initial state of the power distribution terminal to be tested to be a quantile state, and performs constant value parameter configuration on the power distribution terminal to be tested; and then opening quantity ports of the state quantity generator are sequentially controlled to be closed / opened / closed, so that first protocol time synchronization, satellite time synchronization and second protocol time synchronization are carried out on a remote signaling state closing position / separating position / closing position of the to-be-tested power distribution terminal, a corresponding time synchronization result is generated, and finally, a test result of a priority time synchronization function test is generated according to the time synchronization result. According to the method and the system, on the basis of the time checking and time keeping functions of the original power distribution terminal, comprehensive verification of the priority time checking function of the power distribution terminal is added, it is ensured that the power distribution terminal preferentially selects a time checking mode with higher precision, and improvement of automation and practicability of power distribution is facilitated.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a peripheral device may synchronize a local clock with an access point timing synchronization function clock (TSFAP) maintained by an access point (AP) connected to the peripheral device. The peripheral device may maintain an estimated play time timing synchronization function clock (TSFest) associated with output user data based at least in part on the local clock. The peripheral device may receive timing synchronization information from the AP, the timing synchronization information based at least in part on a comparison between a wireless communication device (WCD) play time timing synchronization function software clock (TSFsoft) and the TSFest. The peripheral device may output the user data based at least in part on the TSFest and the timing synchronization information. Numerous other aspects are described.

A method performed by a Policy Control Function (PCF) is provided. The method includes receiving, from either a Network Publishing Function (NEF) or a Time-Sensitive Communications and Time Synchronization Function (TSCTSF), a first request associated with an Application Function (AF) session bound to a Protocol Data Unit (PDU) session. The method further includes, after receiving the first request associated with the AF session bound to the PDU session, determining whether the PDU session is likely for Time-Sensitive Communications (TSC). The method further includes determining whether to accept or reject the first request based on the determination of whether the PDU session is likely for TSC, and sending a first response toward the NEF or the TSCTSF indicating whether the first request is accepted.

The invention belongs to the technical field of iron core grounding current monitoring of transformers, and particularly relates to an iron core grounding current recording method based on precise time synchronization. Comprising the following steps: collecting a current signal through an iron core and a clamp grounding current sensor; time deviation caused by RTC is calibrated continuously in the collection process; performing cyclic sampling and calculation on an output signal of the sensor, sending total current and multiple harmonic waves obtained by Fourier calculation to a display end of an upper computer, and starting fault recording when the value of the total current meets a fault judgment threshold value; when it is judged that a fault occurs, an accurate time mark is provided through an accurate time synchronization function, reserved historical data and collected real-time data are spliced into a wave recording graph during the fault period, and the wave recording graph is backed up and transmitted to a display end of an upper computer to be stored and displayed. According to the invention, some fault phenomena which are short in duration and rapid in generation and disappearance can be effectively monitored, and the change trend of iron core and clamp current when faults occur can be effectively monitored.

The invention discloses a wireless precise clock beacon device based on an ultra-wideband technology, which can receive time information of PTP, GNSS, IRIG-B DCLS and FreeRun, realizes time synchronization of local equipment, has a function of outputting IRIG-B DCLS serial time code streams, and can simultaneously realize time synchronization of the IRIG-B DCLS serial time code streams through an ultra-wideband wireless link. And the time information is broadcasted to other wireless equipment nodes, so that a time synchronization function among the plurality of wireless equipment is realized.

This invention discloses a fault injection and fault tolerance testing device based on a network time synchronization protocol, comprising: a first data interface, a traffic splitting module, a test configuration module, a fault injection module, a time synchronization module, a synchronization status monitoring module, and a second data interface. The fault injection module injects faults into synchronization frames according to fault injection configuration information to obtain fault-injected synchronization frames. The time synchronization module implements the network time synchronization protocol function based on the fault-injected synchronization frames and outputs response synchronization frames. The fault injection module injects faults into the received response synchronization frames to obtain fault-injected response synchronization frames. The synchronization status monitoring module monitors the working status of the time synchronization module, obtains status monitoring information, and evaluates the fault tolerance of the time synchronization function based on the status monitoring information. This invention implements fault tolerance testing of devices with time synchronization functions through hardware logic, making the fault tolerance testing results more reliable.

This disclosure provides methods, components, devices and systems for protecting timing synchronization function (TSF) values with message integrity checks (MICs). Various aspects relate generally to methods for a wireless device to protect the TSF field using an MIC. Some aspects more specifically relate to methods for the wireless device to include a MIC value generated using a TSF field of a beacon frame in a beacon extension frame. Some aspects more specifically relate to methods for the wireless device to include the MIC value generated using the TSF field in an information element (IE) of a beacon frame. In some examples, a vendor-specific (VS) IE or another IE. In some examples, the associated TSF field may be a TSF field of the beacon frame or of a recurring time epoch, such as a target beacon transmission time (TBTT) of the beacon frame.

This disclosure provides methods, components, devices and systems for frame protection in wireless communications. Some aspects more specifically relate to a first wireless device (such as a STA or AP) that may transmit frames with a packet number (PN) that has a time-based portion and a counter value. In some examples, the timebased portion may include a truncated timing synchronization function (TSF) value that indicates a time at which the frame was transmitted from the first wireless device, and the counter value may be incremented for each frame that is transmitted with a same truncated TSF value. A second wireless device may receive the frame and compare the truncated TSF with a current local time based on a truncated local TSF. The second wireless device may process the frame or discard the frame based on the comparison.

Various schemes for preventing medium access control (MAC) header and control frame playback attacks in wireless communications are described. A device (e.g., a work station (STA)) generates a frame containing a packet number (PN), the value of which is set to a time value. The device then sends the frame (e.g., to the intended recipient). The time value may be a value of a partial time synchronization function (TSF) timestamp.

The present disclosure provides methods, components, devices and systems for frame protection in wireless communications. Some aspects are more particularly directed to a first wireless device, such as an STA or AP, that may transmit a frame having a packet number (PN), the frame having a time-based portion and a counter value. In some examples, the time-based portion may include a truncated timing synchronization function (TSF) value indicating a time at which a frame is transmitted from the first wireless device, and the counter value may be incremented for each frame transmitted at the same truncated TSF value. The second wireless device may receive the frame and compare the truncated TSF to the current local time based on the truncated TSF. The second wireless device may process the frame or discard the frame based on the comparison.

Illustrative embodiments provide a system and method for synchronizing wireless audio streams. An input audio data stream including data blocks is received at a transmitter device. A presentation time for each data block is determined based on a local wall clock of the transmitter device. A packetized data stream including the data blocks and presentation timestamps is transmitted to each receiver device. The packetized data stream is received at the receiver and a local wall time is estimated using timestamp information derived from a time synchronization function counter. The received audio data is resampled based on coefficients derived from differences between the local wall time and the received presentation timestamps. Playback timing is adjusted at each receiver device based on the resampled audio data to maintain inter-channel phase coherence across the one or more receiver devices.

The invention discloses a test system and method for a cabin-driving fusion time synchronization function, and the test system can support various time synchronization interfaces such as Ethernet, CAN, PPS and the like at the same time, supports a corresponding synchronization protocol, achieves the comprehensive test of all core time synchronization interfaces in a cabin-driving fusion scene, and meets the application test demands of cabin-driving fusion. A new software architecture is adopted, various time synchronization protocol stacks can be compatible at the same time, different software protocol stacks are adapted according to the protocol stack of the host to be tested, parallel testing of all interfaces is achieved, and the testing efficiency is improved; in addition, through a time jump value and a frequency change value when the local timer is synchronized, quantitative analysis of time synchronization function precision and a maximum error of the to-be-tested host is realized, and whether the to-be-tested host meets application requirements of cabin and driving integration is judged.

The present disclosure provides an address randomization scheme. Implementations of address change schemes for use in wireless communication systems are disclosed. Some implementations include an access point (AP) that can establish two or more address profiles with a station (STA), establish a schedule for switching from a first address profile to a second address profile, where the first address profile and the second address profile belong to the two or more address profiles, and transmit a first data transmission using the first address profile. Some implementations include switching from the first address profile to the second address profile based on the schedule, and transmitting a second data transmission using the second address profile. The schedule can be based on a random time synchronization function (TSF). The AP can establish a joint algorithm with the STA, and determine the first address profile and the second address profile and a transition time of the schedule using the joint algorithm.

Architectures and techniques are described that can facilitate precision timing synchronization with a network interface card (NIC) that is compliant with a peripheral component interconnect express (PCIe) card electromechanical (CEM) specification. In that regard, certain pins that are specified to provide JTAG functionality can be repurposed. Thereafter the particular JTAG pins that are repurposed for precision timing synchronization functions can be utilized to provide precision timing synchronization functions, USB functions, or both. Because the timing synchronization flows through the pins of the NIC, other cabling (e.g., coaxial cables) implemented for the express purpose of timing synchronization can be eliminated.

A method for calibrating a local time within a computing device includes obtaining a first time stamp from a first beacon received from an access point. The method includes obtaining a first clock time from a system clock in response to receiving the first beacon. The method includes obtaining a second time stamp from a second beacon received from the access point, and obtaining a second clock time from the system clock in response to receiving the second beacon. The method includes calculating a differential time as a first difference between the first time stamp and the second time stamp, and includes calculating a clock difference between the second clock time and the first clock time. The method includes calculating a time compensation value as a second difference between the differential time and the clock difference. The method calculates a real-world time based on the time compensation value.

This disclosure provides systems and methods for synchronizing wireless devices with each other. In some implementations, a device transmits, to at least one wireless station (STA), an indication of an enhanced synchronization mode on a first communication link associated with a first access point (AP) of the device. The device transmits, during the enhanced synchronization mode, a plurality of sync frames on the first communication link more often than Target Beacon Transmission Times (TBTTs) associated with the first communication link, each of the plurality of sync frames indicating a Timing Synchronization Function (TSF) offset between the first AP and a second AP of the device. In some instances, at least one of the plurality of sync frames may be a Fast Initial Link Setup (FILS) Discovery frame carrying a TSF value of the first AP.

An operating method of a base station supporting time synchronization of a terminal in a wireless communication system is provided. The operating method includes obtaining, with respect to the terminal connected to the base station, a synchronization indicator indicating whether the terminal requests time synchronization, obtaining, from an application function (AF) or a network exposure function (NEF), a synchronization accuracy required for the time synchronization of the terminal, and activating or deactivating a time synchronization function, based on the synchronization indicator and the synchronization accuracy.

According to disclosed embodiments, methods and systems of data transmission are provided. An aspect of the present disclosure is a method for estimating a TSF value, the method comprising requesting a timing synchronization function (TSF) value, receiving a first TSF value after a TSF read delay, and estimating a second TSF value by compensating the first TSF value using the TSF read delay.

Systems and methods described herein provide an interface for an Network Data Analytics Function (NWDAF) to extract events from a Time Sensitive Communication Time Synchronization Function (TSCTSF) when operators deploy Time Sensitive Networking (TSN) for a given network slice. An NWDAF in a core network receives an information request for a TSN service and sends, to a TSCTSF, a data request based on the information request. The NWDAF receives event data responsive to the data request and generates an analytics report based on the event data.

According to an embodiment, maintaining accurate timing in low-power electronic systems using a low-frequency clock source is proposed. A Timing Synchronization Function (TSF) value is calculated for each clock cycle and errors are determined. Periodic corrections are applied based on calculated residual errors to maintain microsecond-level accuracy. The circuit can include multiplexers, an adder, registers, and control logic to implement variable increments and resynchronization. The TSF counter approximates a higher-frequency clock by incrementing by varying amounts on different cycles. This enables precise timing for applications like low-power wireless receivers while minimizing power consumption. The technique allows the use of an efficient low-frequency clock source like a 32 kHz crystal oscillator while achieving the accuracy of a much higher frequency timer.