71results about How to "Avoid communication delays" patented technology

The invention provides a TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for a relay system and relates to services or facilities suitable for a wireless communication network. The method comprises the following steps: obtaining positions of synchronizing signals and information about cell ID (Identity) number and cell group ID number inside a cell identification group from receiving signals at a relay end, so as to obtain a synchronizing signal sequence received by a relay; secondly, generating a local PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal) according to the obtained relay-end cell ID number and cell group ID number relay end; thirdly, carrying out an integer-frequency-offset estimation process by using the PPS received at the relay end and the obtained relay locally-generated PSS; and finally, carrying out integer-frequency-offset adjustment on the receiving signals of the PSS/SSS at the relay end by using the obtained result epsilon I of the integer-frequency-offset estimation, and carrying out fine-frequency-offset estimation process by using a corresponding algorithm. Therefore, the problem of the frequency offset estimation at the relay end can be solved, and the sending frequencies of the signals received at the relay end and the signals at a base station end are synchronous.

The invention relates to a special-region band-type private network transportation communication navigation monitoring and warning device. The device comprises an LTE (long term evolution) private network communication base station, a GPS (global positioning system)/Beidou dual-mode positioning foundation reinforced reference station, a multifunctional vehicle-mounted multimedia information terminal, a sparse distributed monitoring and LED induced warning device, a traffic warning mobile phone APP (application), a tracking body aerial photography system, a microclimate acquisition device, a distributed automatic snow and frost removing device and a background control and data center. By the device, highway all-section non-blind-area high-speed wireless data communication services and highway vehicle sub-meter high-precision navigation and positioning are realized, lanes where vehicles are located are identified accurately, illegal acts such as overspeed and road occupation of the vehicles are judged, accident information is identified through fixed-point monitoring and fixed-point cruising of unmanned aerial vehicles, along-highway meteorological information is acquired in real time, warning information is released in time, and snow-melting agent is sprayed automatically in snowy and frosty weather so as to guarantee traffic safety.

A radio communication system wherein a radio terminal (200A) and a relay node (300A) are connected to a radio base station (100A), and at least one of the radio terminal (200A) and relay node (300A) can move. The radio base station (100A) controls a handover that is an operation of the radio terminal (200A) to change the connection destination thereof. The radio base station (100A) controls the handover from the radio base station (100A) to the relay node (300A) on the basis of whether a predetermined condition, which indicates that the change in relative distance between the radio terminal (200A) and the relay node (300A) is kept null or small, is satisfied or not.

An information processing apparatus includes a wireless LAN control unit which performs a wireless communication, a power mode setting unit which accepts a setting instruction for setting a power saving mode to be OFF or ON from a user, and a power saving mode setting storage unit which holds a setting that is set for the power saving mode, and a table storing a setting for turning the power saving mode off/on in association with a protocol used in a wireless communication. In case the power mode setting unit holds the setting for setting the power saving mode to be ON, the information processing apparatus controls whether or not to turn on the power saving mode based on a protocol used in the wireless communication and a setting of the power saving mode stored in the table in association with that protocol.

The invention discloses a principal-subordinate integrated type surgical operation robot system which comprises a positioning device, wherein the positioning device is connected with a telescopic device through a positioning fixing base; a principal manipulator is arranged at one end of the telescopic device; a subordinate operation instrument is arranged at the other end of the telescopic device; the principal manipulator is connected with the telescopic device through a principal manipulator connecting piece; the principal manipulator is arranged below the principal manipulator connecting piece through a support rack; the subordinate operation instrument is connected with the telescopic device through a handheld sliding table; the subordinate operation instrument is arranged on one side of the handheld sliding table through an operation instrument machine; a driving device is arranged inside the telescopic device; the driving device is used for receiving a signal transmitted from an encoder of the principal manipulator. By adopting the principal-subordinate surgical operation robot system, the problem of communication time delay is overcome, and the reliability and the security in the operation process are improved.

The invention discloses a relay selection method for reducing transmitting power. The method comprises the following specific steps: a source node firstly sends a RTS (request to send) message; a relay point received the RTS message carries out a channel estimation according to the information and obtains channel status information between the source node and the relay point; each relay point sends a CTS (clear to send) message to the control source node; when the control source node receives the CTS message, the control source node selects a relay for transmitting the information to each source node according to the content of the CTS message through using the designed algorithm; then the control source node informs each source node of the selected result in message mode; the relay receives the RTC message and then responses the CTC message; and after the source node receives the CTC message, the source node formally sends a message through collaborating with the relay node. The selection method provided by the invention is relatively simple and can reduce the transmitting power of the system to a great extent.

The invention provides an achieving method of a light-weight real-time TCP/IP protocol stack. A standard TCP/IP protocol stack is improved through protocol stack initialization, a socket interface module processing state, a transmission layer processing stage, a network layer processing stage, a media access control layer processing stage and a network card abstraction layer processing stage, system expandability is enhanced, system real-time performance is improved, and system overhead and communication delay are lowered.

In a relay apparatus, when an error of the next relay destination is detected at the time of reception of a connection establishment request, the connection establishment request is refused by a connection negative response unit and a negative response relay unit, and a negative response is transmitted to a relay source. When the negative response is received from the relay destination, a connection establishment requesting unit of an end system of a communicating source again issues a connection establishment request in which another relay destination has been selected without notifying an application of a failure of the connection establishment, and establishes a connection to a communicating destination end system by another path.

The invention relates to a vehicle-passing refuse operation control device for a mine track haulage turnout and a control method thereof. A monitoring system for achieving the method is composed of a control substation (1), an axle counter (2), a turnout control box (3) and a turnout servo mechanism (4). The method is achieved in an embedded program mode, and is embodied by vehicle passing axle-counting detection and turnout refuse operation measurement and control algorithms in the control substation. Passing conditions of vehicles in intervals of the turnout in a track haulage system can be detected in real time, the turnout servo mechanism is controlled reliably, and the fundamental aim of vehicle-passing controlling refuse operation is achieved especially aiming at a turnout measurement and control device under the conditions of vehicle passing.

The present invention provides a data communication apparatus for solving the following problem. When generating coded frames of multiple data streams, in the case where there is a bias in code amount of the generated coded frame, the communication apparatus is instantaneously overloaded, causing packet losses.

The network cameral terminal which is the data communication apparatus includes a sensor unit that takes images or audio information, a compression unit that compression-codes the image or the audio signal and generates coded frames (I-frame, P-frame, B-frame and others), a frame control unit that controls types of the coded frame generated by the compression unit using a generation table held in a generation table holding unit, and a communication unit that transmits the coded frames to multiple communication terminals on the network in parallel.

An operation method of a terminal located in a vehicle supporting vehicle-to-everything (V2X) communication may include: receiving, from a base station, a first message requesting reporting of a first counter corresponding to a channel busy ratio (CBR) measurement cycle for a carrier (re)selection procedure; transmitting, by the terminal, a second message including the first counter to the base station; and receiving, from the base station, a third message including a second counter corresponding to a CBR measurement cycle for a resource pool (re)selection procedure. The second counter can be reconfigured by the base station to be greater than or equal to the first counter.

The invention discloses a single-pole grounding fault line selection method for a multi-terminal small-current grounding flexible direct-current system, and relates to the field of relay protection ofmulti-terminal flexible direct-current systems. Aiming at the problem of difficulty in single-pole grounding fault line selection of a direct-current power distribution network in a low-current grounding mode, the single-pole grounding fault line selection method comprises the following specific steps of: firstly, reading voltage and current data, iteratively recording the current data of 256 sampling points, then determining a starting criterion and electrode selection judgment, judging whether a fault exists or not according to the starting criterion, if so, judging whether a positive electrode fault or a negative electrode fault exists according to the electrode selection judgment, after selecting the positive/negative electrode fault, carrying out noise reduction processing on currentwaveforms of the positive and negative electrode lines by utilizing wavelet transformation, representing the difference of fault currents of the positive and negative electrode lines by utilizing a ratio of residual absolute values after noise reduction, comparing the difference with a threshold value, determining a faulty line, and sending out a fault signal. According to the single-pole grounding fault line selection method, the problem of difficult threshold setting caused by noise interference and current amplitude change is avoided, and the reliability of a line selection scheme is improved.

An engine start system has a rotating electrical machine, a starter motor, an engine ECU and an ISG controller. The rotating electrical machine is connected to an output shaft of an engine. The starter motor drives the engine to be restarted. The engine ECU controls the engine operation. The ISG controller instructs an inverter when the rotating electrical machine performs power running and regenerative power generation. The ISG controller communicates with the engine ECU, and adjusts the operation of the starter motor and the rotating electrical machine. When receiving an engine restart request, the ISG controller drives at least one of the starter motor and the rotating electrical machine so as to restart the engine.

The invention discloses a communication method of a transmission control protocol (TCP) and a server. A first communication agent of a first server receives a data packet sent by a first application program, analyzes a destination address of the data packet and determines a second server in which a second application program is located, wherein the second application program receives the data packet. The data packet is put in a first queue and is sent to a second communication agent through the regular connection of data link of the first communication agent and the second communication agent of the second server. The first communication agent of the first server receives the data packet which is sent by the second application program and is forwarded by the second communication agent through the regular connection of data link, analyzes the destination address of the data packet, puts the data packet into a second queue and sends to the first application program which receives the data packet through inter-process communication connection. By using the method and the server of the invention, an actual connection quantity between the first application program and the second application program can be substantially reduced and resources needed by a system to maintain TCP connection can be effectively saved.

The invention discloses a multi-chip series automatic address coding system and method, and the system comprises a main control device and N chips, the main control device is connected with a first chip, and the sending end of each chip is connected with the receiving end of the next chip from the first chip to the Nth chip; the main control device is used for sending an automatic address distribution instruction to the first chip; wherein the automatic address distribution instruction comprises an ID; and each chip is used for receiving the automatic address allocation instruction, decoding the automatic address allocation instruction to obtain the ID, setting the ID as a chip ID, carrying out operation on the ID according to an operation rule to obtain an operation automatic address allocation instruction, and sending the operation automatic address allocation instruction to the next chip. The communication efficiency is high; through automatic address coding, a chip address does notneed to be set by occupying an IO port of the chip, the chip address can be redistributed at any time when the chip is replaced, maintenance and replacement of the chip are facilitated, and use is more convenient. The invention relates to the technical field of communication.

The invention discloses an estimation method for a TD-LTE digital relay downlink channel, relates to services or facilities suitable for wireless communication networks, and is the low-complexity estimation method for the downlink channel of an RD-LTE digital relay system. The method comprises the following steps: firstly, selecting community special reference signals from LTE downlink reference signals, and determining an insertion mode of scattered pilot frequency according to the rule of physical layer reference signals by TS36.211 in a 3GPPR8 protocol; and at the relay receiving end, utilizing a recursive least square algorithm to carry out pilot frequency point channel estimation for synchronized orthogonal frequency division multiplexing symbols, then carrying out linear interpolation in a frequency domain so as to obtain the frequency domain channel characteristics, and finally, carrying out the linear interpolation in a time domain so as to obtain the channel characteristics of all data points. The estimation method has the remarkable advantages that the algorithm is relatively simple, has a certain channel time-frequency characteristic tracking ability, and overcomes the high-complexity shortcoming of a current LTE downlink channel estimation algorithm.

The invention discloses a control method and drive device for robot flexible joints. The method comprises the following steps: (1) position measurement signals at the two ends of a spring are acquired; (2) pre-processing is conducted on the position measurement signal; (3) the signal obtained through pre-processing is output to an upper computer, and the upper computer plans the signal and inputs a target signal to flexible joints; (4) a speed instruction signal is obtained through calculation; (5) the speed instruction signal is input into a corresponding servo driver, and movement of the flexible joints is controlled; (6) the existing signal is compared with the target signal, if the existing signal is the equals the target signal, operation is stopped; if not, the steps from (1) to (5) are repeated till the existing signal equals the target signal. According to the control method and drive device for robot flexible joints, the acquired position signal is directly processed in a function expansion card, uncertain communication delay caused when the position signal is transmitted to the upper computer for processing is avoided, and the control effect of the robot flexible joints is good. The flexible joints are controlled through force or torque, accidents can be effectively avoided, and a robot is high in safety.

The invention provides handheld radar for measuring the surface velocity of a river-way. The radar comprises a radar module, a processing module and a display module, wherein the radar module is used for transmitting a first radar wave to a liquid surface of the river-way and receiving a second radar wave reflected by the liquid surface, so as to generate Doppler beat frequency signals; the processing module is used for acquiring the angle of an incidence liquid surface of the first radar, and outputting the surface velocity by combining the Doppler beat frequency signals; and the display module is used for displaying the surface velocity. Compared with the prior art, the handheld radar provided by the invention can calculate the surface velocity according to the radar wave reflected by the radar module and the radar wave reflected by waves; furthermore, the handheld radar can be used for measuring the surface velocity precisely in a non-contact way in case of high-speed water current, sewage and floaters, even debris flow and slurry.

The invention discloses a communication system for transmitting a human-shaped doll image or video. The communication system comprises at least one transmitting end device, at least one receiving end device and a server. The receiving end devices are used for storing a piece of body information, and the server is in communication connection with the transmitting end device and the receiving end devices and used for storing a piece of three-dimension head portrait information, wherein the three-dimension head portrait information corresponds to a user of the transmitting end devices. The server receives a piece of recognition information and a communication request from the transmitting end devices and transmits the three-dimension head portrait information to the receiving end devices according to the communication request. The three-dimension head portrait information corresponds to the recognition information. The receiving end devices display the human-shaped doll image or video according to the three-dimension head portrait information and the body information. The invention further discloses a method and the server for transmitting the human-shaped doll image or video.

The invention relates to the technical field of power system power utilization information acquisition, provides a power utilization information acquisition method and device, and is applied to a power utilization information acquisition system. The system comprises a main station, an energy controller, a CCO, a plurality of STAs and power utilization information metering equipment corresponding to each STA, wherein the main station, the energy controller, the CCO, the STAs and the power utilization information metering equipment are connected in sequence. The method comprises the following steps: the CCO reads cached power utilization information from the STA according to a received power utilization information reporting instruction, and reports the read cached power utilization information to the main station, wherein the cached power utilization information is obtained by actively reporting the power utilization information metered by the power utilization information metering equipment to the corresponding STA by the power utilization information metering equipment. According to the technical scheme, the transmission efficiency of the power utilization information can be effectively improved so that the adjustment and decision-making capabilities of the main station are improved.

The invention relates to a wireless broadcast time service system based on an OFDM technology. The method comprises an OFOM system design and a time service signal forwarding network. The OFOM systemdesign comprises a basic parameter baseband, a subcarrier, an OFDM data body, an OFDM cyclic prefix, an OFDM symbol, a modulation mode, an FEC code, a synchronization signal, a signal intra-frame OFDMsymbol, a signal frame, an OFDM symbol effective subcarrier and a frequency domain pilot. The method comprises the following processing steps of establishing an OFDM signal frame structure, designinga synchronization signal, designing an OFDM symbol, carrying out FEC spread spectrum processing, and processing by other system sub-modules. The wireless broadcast time service system based on OFDM technology is advantaged in that the system not only can complete a communication network for transmitting time service signals in a common environment and a complex environment, but also has the characteristics of strong signal coverage, high time service precision and good concurrency, and meets the transmission requirements of the time service signals under different conditions.

The invention discloses a wireless multi-channel communication device and a multi-channel real-time communication method. The device comprises receiving units, sending units and a central coordination processing unit, wherein the receiving units are used for receiving data on a set wireless channel, the sending units are used for sending data on an appointed wireless channel, and the central coordination processing unit is electrically connected with the receiving units and the sending units and used for acquiring the data received by the receiving units in real time. When data need to be emitted, an idle wireless channel used by the sending units is appointed according to states of the current wireless channels, and the data needing to be sent on the idle wireless channel are transmitted to the sending units. By means of the device and method, the conditions of the channels can be monitored at the same time, accurate channel busy and idle distinguishing threshold values are acquired according to effectively receiving and continuous sampling, whether collisions or distortion is produced or not can be judged according to a data package emitted by the device, very high real-time performance is achieved, and communication delay caused by channel conflict can be avoided.

The invention discloses an electronic communication system, which comprises a processor, a communication module, a power supply module and a display screen. The communication module, the power supply module and the display screen are connected with the processor. The communication module is in communication connection with a wireless transceiver and a server. The communication module comprises a radio frequency communication unit and a wireless communication unit. The wireless communication unit is in communication with the processor and the server. The radio frequency communication unit is in communication with the processor and the wireless transceiver. The radio frequency communication unit is used for receiving the information of the processor, converting the information into radio-frequency signals, transmitting the radio-frequency signals to the outside, and inputting the received information to the processor. The processor is further connected with a signal detection module used for detecting the signal intensity and an identification module used for identifying the chip information. According to the invention, a plurality of communication modes are adopted. Before the communication connection is established, the signal intensity of the environment is detected. After that, a communication mode is selected or switched. Therefore, the communication delay problem and the connection failed and retry problem of a single communication mode in the poor signal condition can be avoided.

When a printing apparatus including a wireless communication unit receives a print job, a power saving mode of the wireless communication unit becomes temporarily disabled. When reception of the print job is completed, the power saving mode returns to an enabled state.

The invention relates to an abnormal data detection method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring to-be-detected data acquired by sensing equipment in the Internet of Things; inputting the feature vector corresponding to the to-be-detected data into a strategy selection model, and determining a target model identifier through the strategy selection model; determining a target detection model corresponding to the target model identifier from detection models deployed at multiple levels of the Internet of Things. wherein the hierarchy where the target detection model is located is matched with the hierarchy characteristics represented by the feature vectors of the to-be-detected data; transmitting the to-be-detected data to a detection device in the hierarchy where the target detection model is located, so that the target detection model deployed in the detection device processes the feature vector; and outputting a detection result corresponding to the to-be-detected data, wherein the detection result includes a detection result representing normal and a detection result representing abnormal. By adopting the method, the anomaly detection efficiency can be greatly improved.