78 results about "Timing Synchronization Function" patented technology

A method of keeping global time in a wireless network, the method comprising the steps of: using a first 802.11 chip set to read a Time Synchronization Function (TSF) to provide an initial time base; using an interconnected clock control circuit to read the TSF time directly from the 802.11 chip set and to implement a local clock based on time values read from the TSF function.

Coordination and synchronization is performed between two or more wireless network managers (e.g., access points (APs)). A first wireless network manager supports first communications with first other wireless communication devices, and a second wireless network manager supports second communications with those first and/or second other wirelessly case devices. The first and second wireless network managers also support communications with one another to coordinate the first and second communications supported with the first and/or second other wireless communication devices. Examples of coordination include selection of which other wireless communication devices are serviced or in communication with which of the first and second wireless network managers, selection of operational parameters (e.g., modulation coding set (MCS), beamforming, frequency band assignment, channel assignment, scheduling information, transmit power, etc.) for the first and second wireless communication devices, synchronization to a common clock (e.g., using timing synchronization function (TSF)).

The invention features: less energy expenses, less complexity, and compensation function for the drift and offset. It uses PLL (phase locked loop) principal and a single-way broadcast synchronous mechanism to scheme out a solution which simultaneously has the compensation function for the drift and offset and the time synchronization function of radio sensor network.

A method for power saving in a wireless local area network and a device using the same are provide. The device wakes up at a start of a wakeup time and receives a wakeup physical layer protocol data unit (PPDU) during the wakeup time. The device updates a timing synchronization function (TSF) timer in accordance with a value in the wakeup PPDU.

Disclosed herein are techniques for timing synchronization between a first wireless device and a second wireless device. The techniques include sending a first message by the first wireless device to the second wireless device, obtaining a first timestamp at the first wireless device by the first wireless device, and receiving, by the first wireless device, a fine timing measurement frame from the second wireless device in response to the first message. The fine timing measurement frame includes at least a part of a second timestamp from the second wireless device. The techniques further include determining by the first wireless device that the first wireless device is not synchronized to the second wireless device based at least partially on the part of the second timestamp and the first timestamp.

The invention relates to the field of the Internet of things, and particularly relates to the industrial Internet of things, such as an industrial control service time synchronization scheme design of a smart power grid. In an application environment of the industrial Internet of things, the invention provides a service message time synchronization scheme, for overcoming the defect that a service terminal has no time synchronization function with an information master station. It can be seen from analysis that, the scheme can be used for guaranteeing the time synchronization of a service message between a terminal device and the information master station in the case of no congestion of the network, and can be used for guaranteeing the service message to meet the time sequence logic requirements of the terminal device in the case of congestion of the network, so the scheme is a weak synchronization technology. Meanwhile, the invention provides a three-level time synchronization structure suitable for the construction of the smart power grid by combining the time synchronization scheme with the current situation of the power grid. The three-level time synchronization structure can support whole network time synchronization of a power system, guarantee the time synchronization and time sequence requirements of a power service message and meet the demands of multi-service access and multi-service protocol type conversion of a master station of the power system.

An apparatus for a station (STA) is generally described herein. The STA includes a low-power WUR (LP-WUR), a local timing synchronization function (TSF) timer, and processing circuitry. The processing circuitry can decode a signal received from an access point (AP) at the LP-WUR, the signal including a TSF value, the TSF value including a subset of octets of a TSF timer associated with the AP. The STA can synchronize the local TSF timer of the STA with the TSF timer associated with the AP by adjusting a local TSF timer based on a count of a number of octets included in the subset of octets. The LP-WUR can wake up a wireless local area network (WLAN) radio of the STA at a wake-up time based on the local TSF timer. Other methods, apparatuses and systems are also described.

The invention discloses a ring network node clock effectiveness judgment method and device. In the method, when network links and configuration are normal and each node has the clock/time synchronization function, a detection slave port having a normal time synchronization PTP port is selected from ring network nodes, at least one additional detection slave port is configured for the detection slave node, and an alarm is selected whether to be reported according to at least two sets of time deviation values calculated through the interaction between the detection slave port and the upstream equipment and between a BMC slave port comprised in the time synchronization PTP port and the upstream equipment separately, and if the difference value between the two sets of time deviation values exceeds a preset alarm threshold value, then the alarm is reported. According to the invention, through the selection of the detection port, the PTP message interaction between the ports and the calculation and comparison of the time deviation values, the ring network node clock effectiveness can be judged, and the alarm is reported.

The invention provides an IEC (international electrotechnical commission) 61850 based verification system and an IEC 61850 based verification method for a switch mechanical characteristic testing device. The system is communicated with a to-be-tested device through an IEC 61850 network, and outputs state quantity and analog quantity to test the switch mechanical characteristic testing device. The verification method includes electric current accuracy testing, mechanism case temperature testing, energy storage medium pressure testing, opening and closing time testing, time synchronization function testing, diagnostic analysis function testing and repeatability testing. The verification system and the verification method have the advantages that various states of switchgears are replaced by analog signals and switching signals, so that repeatability is high, testing process is concise, and various working conditions, fault conditions and the like of the switchgears can recur; the verification system and the verification method are suitable for testing, functional identification and verification of the switch mechanical characteristic testing device in the electric power industry.

The invention discloses a regional power network intelligent equipment time analyzer which comprises an analysis main control module, an Ethernet module with an IEEE1588 time synchronization function, an electric Ethernet module, an IRIG-B and pulse clock optical-electric BNC signal form input and output module, a satellite signal receiving module and a portable clock module. The Ethernet module, the electric Ethernet module, the input and output module, the satellite signal receiving module and the portable clock module are connected with the analysis main control module. The regional power network intelligent equipment time analyzer is supportive of time synchronization accuracy index analysis evaluation and IEEE1588 uniformity testing, can provide an intelligent device time synchronization index tester which is convenient to use, effectively overcomes a series of problems of insufficiency in intelligent equipment time accuracy index and IEEE1588 product testing means, incapability of effectively performing abnormity testing, narrow test coverage, difficulty in error positioning during testing and the like of current regional power networks and intelligent transformer substations, is suitable for intelligent equipment, related to the regional power networks and the intelligent transformer substations, such as combiners, intelligent terminals, IEEE1588-supportive exchangers, clock source equipment and protection control equipment, and has important practical value.

The invention discloses a GNSS (Global Navigation Satellite System) receiver simulator and a gravity field inversion system. The GNSS receiver simulator comprises a real-time simulation control module and an observation data generation module, wherein the real-time simulation control module is used for acquiring position information of a satellite and position information of a user based on the received orbital data, the gravity parameters and the atmospheric parameter, simulating error information on a satellite signal by the ionosphere, the troposphere and multipath effects and sending the position information of the satellite, the position information of the user and the error information to the observation data generation module; and the observation data generation module is used for generating observation data for the satellite based on the position information and the error information sent by the real-time simulation control module. The GNSS receiver simulator can realize an on-orbit time synchronization function and a real-time orbit determination function, the orbit determination precision is high and is no more than 50 m.

The invention discloses a time synchronization method and an apparatus thereof. The method comprises the following steps: a terminal sends a time synchronization short message to the terminal itself through network-side; the terminal receives the time synchronization short message sent by the terminal and parses the time stamp information in the time synchronization short message; the terminal determines the synchronization time according to the above time stamp information. According to the technical scheme provided in the invention, the problem that the time synchronization function can not be realized since that an established mobile communication network does not support synchronization protocol is solved, thus the time synchronization function is realized in the case that the network equipment does not support the function.

The invention discloses a PXIe bus-based satellite communication system simulator. The PXIe bus-based satellite communication system simulator adopts a PXIe bus-based card inserting structure, and is composed of upper computer software and a hardware signal processing module; the hardware signal processing module comprises a zero slot controller, a clock synchronization management board card, an intermediate frequency signal generating board card, an intermediate frequency signal receiving board card, an upper frequency conversion board card, and a lower frequency conversion board card; and the upper computer software runs on the zero slot controller configured with the Windows operating system. According to the PXIe bus-based satellite communication system simulator, the board cards are combined flexibly; all-round full test can be carried out on the satellite communication system; and the technical advantages of the PXIe bus architecture towards an instrument system is combined to enable transmission of a reference clock to be more conveniently synchronous with multiple signal board cards and the instrument, the timing synchronization function is enhanced, and flexibility, compatibility and extensibility of the satellite communication system simulator are improved.

The invention relates to a time-triggered Ethernet simulation system. The system comprises a network planning unit, a network scheduling unit, a communication simulation unit and a time synchronization simulation unit; the network planning unit comprises a network topology planning module for generating a network topology file, a network traffic configuration module used for configuring network traffic parameters and each traffic transmission path; the network scheduling unit is used for generating a network scheduling table meeting a set network constraint condition according to network topology information and traffic information; the communication simulation unit is used for realizing the communication simulation of different types of services; and the time synchronization simulation unit is used for realizing message curing, compression, clock synchronization service, cluster monitoring, and state machine clock synchronization. The system of the present invention is more comprehensive and in-depth than the prior art that only simulates a time synchronization function.

The invention relates to a method for synchronizing real-time data in a heterogeneous database system. The system designs an integrated data layer, a real-time synchronization function between data sources is provided for data from heterogeneous data sources, the heterogeneous data source realizes real-time synchronization in the integrated system structure of the heterogeneous data source, and anexisting heterogeneous data source integration mode is not affected.

The invention discloses a vehicle-mounted time synchronization serving method and system; and the vehicle-mounted time synchronization serving system corrects and adjusts the time of a client of a vehicle-mounted device to be in a more accurate state through a time synchronization function. The technical scheme of the invention is as follows: the vehicle-mounted time synchronization serving system comprises a time synchronization client, a vehicle full-time online system and a time server, wherein the time synchronization client establishes real-time connection with the vehicle full-time online system and transmits network events establishing connection with the vehicle full-time online system to the time server of a cloud terminal; the vehicle full-time online system establishes communication link with the time server; and the timer server synchronizes time information to the time synchronization client after receiving the network events establishing connection and transmitted by the time synchronization client.

The invention discloses a novel tethered unmanned aerial vehicle, which comprises an airframe structure, an airframe power supply device, a power device, a measurement and control device, a mooring device and a task load device. The airframe structure comprises a suspension arm, a center box and a landing support device, which are used for carrying and installing the on-board task equipment, the power equipment and the measurement and control equipment of the new-type tethered unmanned aerial vehicle. The airframe power supply equipment is used for supplying electric power; Power equipment includes propellers, motors and electrically regulated mooring to provide the lift required by the tethered UAV and the steering force required for the control of the tethered UAV platform. Power equipment provides power for the tethered UAV during the lift-off, hover and recovery phases. Measurement and control equipment includes GPS, optical terminal computer, flight control unit, which has flightcontrol function, parameter measurement function, time synchronization function and data transmission function. Mooring equipment includes guide pulleys, lifting platforms and cable storage drums, which are used for power supply, lift-off, site recovery, off-site transportation, commissioning and maintenance of moored UAVs.

The invention relates to a hybrid clock synchronization method based on timestamp-free interaction and unidirectional message propagation, and belongs to the technical field of wireless sensor networks. The method can be executed simultaneously with a broadcast mechanism according to a one-way message propagation synchronization mode. The timestamp-free interactive synchronization can implicitly acquire synchronization information in a network data stream, and the method performs joint design and optimization on a timestamp-free interactive synchronization mechanism and a unidirectional message propagation mechanism, so that seamless fusion of a time synchronization function and an actual wireless sensor network is realized. According to the method, the joint estimation of clock frequencyoffset, phase offset and fixed time delay can be realized without carrying out synchronization information transmission by a special synchronization message, the node synchronization communication overhead is effectively reduced, and the clock phase offset estimation performance is improved.

The invention discloses an iterative timing synchronization method for an interleave-division multiple-access (IDMA) system. The method comprises the following steps that: 1, a base station of the IDMA system estimates the time offset of different users by utilizing a signal to noise ratio-variance evolution technology in an iterative detection process; 2, the time offset information of each user is fed back to transmitters of corresponding users; and 3, the users implement the iterative timing synchronization method for time offset compensation to realize the iterative timing synchronization function of the IDMA system. By the circuit and the method, the problems of timing synchronization bottlenecks in the IDMA uplink communication system are solved; and the circuit and the method are mainly applied to timing synchronization in uplinks of the IDMA system.

A method is used by a mesh point that includes one or more step of receiving one of a beacon and probe response from an other mesh point; setting a state of whether the mesh point is already synchronized with one or more peers to true and performing a beacon timing synchronization function when the mesh point is in the unsynchronized state and the other mesh point requests synchronization from a peer mesh point; adding an identity of the other mesh point to a database of beacon senders maintained by the mesh point and performing a beacon timing synchronization function when the mesh point and the other mesh point are both synchronized; and providing indications of whether the mesh point supports synchronization, requests synchronization from a peer mesh point, and is already synchronized with one or more peer.

The invention provides communication methods and devices of a wireless local area network, access point equipment and site equipment. One of the communication methods of the wireless local area network includes: detecting dormancy period duration of secondary communication interfaces of all associated site equipment, which supports a WUR (Wake up Receiver) mode, according to a preset period; determining a maximum value in the dormancy period duration, and marking the same as maximum dormancy duration; determining bit quantity of a partial time synchronization function (PTSF) according to the maximum dormancy duration; generating a wake up beacon frame, wherein the wake up beacon frame includes the partial time synchronization function, and the partial time synchronization function is usedfor instructing the site equipment to carry out time synchronization; and sending the wake up beacon frame according to a preset time interval. Through the technical solution of the invention, bit length of a time parameter is dynamically adjusted, thus power consumption of a sender and a receiver is reduced, and at the same time, data transmission efficiency is also improved.