385results about How to "Data transmission is stable" patented technology

[Problems] To realize a reliable and stable transfer of digital data that does not require a reference clock and a handshake operation.

[Means for Solving the Problem] The present invention provides a digital data transfer method for alternately and periodically transferring first information and second information respectively in a first period and in a second period, wherein: an amount of information of the first information per unit time in the first period is greater than an amount of information of the second information per unit time in the second period; and the second information in the first period is transferred as pulse-width-modulated serial data.

A device and a method for optimizing data transfer rate in an InfiniBand fabric is provided where a various number of transmitting devices aim data packets to a single receiving device or through a common link. The method which is implemented in an InfiniBand switch includes marking of packets in a rate corresponding to centrally configured marking rate, determination of the current number of data flows between the input ports and the output port of the switch and marking the data packet with Forward Explicit Congestion Notification according to an adaptive value of marking rate which depends on the initial value of the marking rate and is inversely proportional to the number of data flows.

The invention belongs to the field of wireless communication, and particularly relates to a self-upgrade method for equipment in a remote online monitoring system. The method is characterized in that: each piece of terminal equipment performs self-upgrade and self-maintenance through the remote online monitoring system consisting of a terminal table tool, a data acquisition unit and a background server based on a GPRS (General Packet Radio Service). The method mainly comprises the following steps that: the background server manages an application program and version information; the data acquisition unit periodically inquires a version log and downloads a new version program; the data acquisition unit realizes self-upgrade and upgrades the terminal table tool; and after the new version program is updated successfully, skipping is performed and an old version program is still kept for later use. In the method, the GPRS, storage space management, a file sub-package mechanism, a transmission response mechanism, a mode for continuous transmission at break-points and an IAP (Internet Access Provider) program programming mode are combined, and the accuracy and reliability of data transmission are ensured; and under the condition of not influencing normal use of a user, the equipment upgrading and maintaining problems of large quantity and wide distribution are solved quickly and efficiently.

The invention relates to a micro-strapdown altitude heading reference system and a working method of the micro-strapdown altitude heading reference system. The system comprises a data acquisition module, a data processing resolving module and a peripheral communication interface module, wherein the data acquisition module integrates a three-axis gyroscope, a three-axis accelerometer, a three-axis magnetic resistance sensor and an SPI (Serial Peripheral Interface) into an integrated micro-electronic mechanical system sensor; the data processing resolving module adopts a 32-bit ARM (Advanced RISC Machine) microcontroller; and the peripheral communication interface module consists of a serial port level switching chip, an RS-232 interface, a CAN (Controller Area Network) transceiver and a CAN interface. The working method of the system comprises the working steps as follows: the system is electrified and initialized; the system is self-tested; a magnetic field is self-calibrated; initial alignment is conducted; measured attitudes are combined: resolving the information of attitude headings according to initial three-dimensional altitude and altitude resolving algorithm of the strapdown altitude heading reference system, and resolving the three-dimensional magnetic altitude angle according to the compensated magnetic field information and acceleration information, conducting the information merging algorithm and finally obtaining the stable altitude heading reference information; and the altitude heading reference information is sent to application equipment.

A method of and an apparatus to improve stability and efficiency during data transmission performed over a wireless network includes transmitting a first data frame containing a plurality of data units to a receiving device, receiving from the receiving device a receipt of confirmation for each data unit received by the receiving device, and transmitting a second data frame containing at least one of the plurality of data units that have not been transmitted or received, according to the receipt of confirmation for each data unit received by the receiving device.

A voltage-controlled oscillator includes a voltage-controlled phase-shift circuit, outputting a signal with the shift deviated from an input signal by a specified amount with an external control voltage Vt, a SAW resonator, a buffer, inputting a resonance signal having a specified resonance frequency from the SAW resonator, outputting a clock signal with a desired frequency, and outputting a positive-feedback-oscillation-loop output signal, wherein the voltage-controlled phase-shift circuit, the SAW resonator, and the buffer construct a positive-feedback oscillation loop, in which the frequency temperature characteristic of the SAW resonator is rotated by a specified amount using the temperature characteristic of the propagation delay time of the buffer to correct the frequency temperature characteristic of the SAW resonator.

The invention discloses a server and a method for remotely upgrading a programmable logic device thereof, which relate to the field of research and development of server hardware and development of embedded software. The server disclosed by the invention comprises the programmable logic device and a BMC (Baseboard Management Controller), wherein the BMC is used for receiving data transmitted by a client through the Ethernet, converting received data into data of a data format accordant with a standard JTAG (Joint Test Action Group) protocol and burning the converted data into the programmable logic device through a general GPIO (General Purpose Input/Output) port to realize upgrading. In the embodiment of the invention, remote upgrading of the programmable logic device in the server is realized without increasing hardware resources of a server integrated circuit board. The server has the advantages of stable data transmission and high transmission speed.

A keyboard, video, mouse, and storage (KVMS) switch is described. The KVMS switch has a server computer interface, a keyboard-mouse-monitor interface, a storage device, and a control device. The server computer interface connects to at least one server computer and the keyboard-mouse-monitor interface connects to a keyboard, a mouse, and a monitor. The storage device with data stored therein is configured inside the KVMS to update and install software for the server computers. Therefore, the security and efficiency of server computer management are enhanced.

This invention relates to wireless transparent D2D system transmission method based on the public mobile data communication net and the current operator provided 2.5 G mobile data communication package transmission exchange platform of GPRS/CDMA2000 1X. The invention comprises wireless D2D terminals and gates working at the common wireless network and central Ethernet linkage layer to realize the remote transparent wireless data transmission and exchanging function.

The invention relates to an individual soldier helmet type emergency command system based on various 3G (3rd-Generation) wireless networks, belonging to a system for wireless multifunctional communication based on an individual soldier knapsack and a helmet platform structure. The individual soldier helmet type emergency command system comprises a fully functional helmet, a master controller, the individual soldier knapsack and an operation box. The fully functional helmet is provided with a video camera, an illuminating lamp, a video display unit, a touch sensing type microphone and bony earphones. The master controller is arranged in the individual soldier knapsack. A wireless communication module, a five-path communication antenna, a multi-mode wireless communication module, a network exchange module and a data acquisition and exchange interface are arranged in the master controller. An individual soldier knapsack belt is provided with the operation box. The system does not need to be externally connected with display devices, supports traditional various 3G networks for two-way wireless transmission and interaction of audio and video signals and data, and can be used for executing a plurality of functions, such as remote command, wireless video sessions, image transmission, wireless reconnaissance, wireless measurement, and the like.

The invention provides an RDMA (Remote Direct Memory Access) communication method between non-tightly-coupled systems of a sharing system address space. A destination node is remotely accessed by a source node through a direct memory access instruction and a remote direct memory access RDMA connection is established between the source node and the destination node; data transmission is executed between the source node and the destination node after the RDMA connection is established; the RDMA connection is released after the data transmission is achieved, wherein shared memory resources and I/O resources of the remote destination node are mapped into a local MMIO (Memory-Mapped I/O) address space of the source node. According to the RDMA communication method between the non-tightly-coupled systems of the sharing system address space, the rapid stable data transmission between non-tightly-coupled nodes can be implemented.

The present invention discloses a self-adaptive time slot allocation method according to node density and loads in a self-organizing network, and the method is mainly used for solving the problem that the certain delay requirement is difficult to ensure under the condition of variable node density and loads in the wireless self-organizing network. The method includes the steps as follows: 1. accessing the network by the node P and constructing a slot time table; 2. selecting the time slot by the node P; 3. judging the time slot type of the node P at the current time; 4. adjusting the occupied fixed time slot according to the node density under the condition of broadcast type time slot; 5. performing dynamic time slot ordering and release according to loads under the condition of fixed time slot so as to realize the time slot allocation. The method provides the basic data transmission ability and stable data transmission, ensures the stability of the system delay requirement, and can be used for the TDMA protocol in the mobile self-organizing network.

The invention discloses an intelligent scheduling high definition integrated networking video monitoring system based on cloud computing. The system comprises a front-end device, a sensor access subsystem, a controlling and scheduling subsystem, a data processing subsystem, a data storage subsystem, a data streaming media subsystem and a user terminal. The system has the following advantages: (1) the data storage capacity is large, and the data storage capacity can be expanded in a modular manner; (2) long-distance large-scale video monitoring is supported; and (3) high-efficiency data processing ability is provided.

A card connector is disclosed that includes an insulating housing and a plurality of contacts. The insulating housing defines a plurality of contact slots. Each of the contact slots extends outwardly and laterally to opposite sides to form two resisting protrusions respectively, wherein each of the resisting protrusions forms a resisting surface extending obliquely and inwardly from one side thereof. The contacts are respectively received in the contact slots of the insulating housing. Each of the contacts has a contact portion protruding upwardly for being pressed by a card and the contact portion is connected with a bearing portion resisting against the resisting surface for preventing the contact portion from flipping upwardly out of the insulating housing.

Disclosed herein are a method for balancing the quality of a wireless communication channel wherein the quality of the wireless communication channel can be more accurately estimated and adjusted on the basis of the combination of observation results of the number of data frames failed to be transmitted in the past and a received signal strength (RSS), and reliability of data transmission over the channel can thus be increased, and a wireless communication apparatus using the same. The method includes collecting information about whether data frames have been successfully transmitted and information about RSSs of the wireless communication channel, acquiring the number of data frames failed to be transmitted and an average RSS in a predetermined observation period using the collected information, comparing the acquired transmission-failed data frame number with a predetermined threshold value and the acquired average RSS with a predetermined reference RSS, respectively, and estimating the quality of the wireless communication channel and quality degradation factors in detail by performing an AND operation with respect to the comparison results. Therefore, it is possible to stably adjust the channel quality.

The invention relates to handling of an acknowledgement message related to packet data transmission, said acknowledgement message acknowledging positively or negatively one or more data blocks sent from a terminal and said acknowledgement message comprising an information element related to the acknowledgement which element conditionally comprises a length field L, which indicates the length of the value part of said information element and possibly an uncompressed Ack/Nack bit map of varying length, which bit map length Lu may be calculated from the value of L with a predetermined calculation formula. In the method, one receives an acknowledgement message comprising said information element from a data transmission network and automatically ignores an uncompressed Ack/Nack bit map possibly included in the acknowledgement message, if said length field L is unspecified from the viewpoint of the terminal.

An apparatus and method of enhancing a block Ack in a WLAN is disclosed. The apparatus includes a frame verification module receiving a plurality of data frames and selecting erroneous frames, a sequence control mapping module mapping sequence numbers of the selected frames with spoofing numbers, and a frame combining module combining the mapped frames with other sequence frames and transmitting the combined frames. The data frames include spoofing sequence control frames with which the spoofing sequence numbers are mapped.

The invention relates to an airport runway foreign body monitoring system and method. The system includes an FOD private network which is connected with a plurality of FOD monitoring points, a wireless access point, a data center, a control center an airport private network; the wireless access point is connected with a handheld mobile terminal to obtain feedback, access and foreign body information and send foreign body cleaning instructions; the FOD private network obtains flight plans, foreign body confirmation instructions, monitoring point control instructions, database operation instructions, monitoring point control instructions, data fusion results and video splicing signals, and obtains monitoring point returned information, foreign body information, feedback information, access information and the state information of the control center; the data center obtains the FOD monitoring point control instructions, the database operation instructions, the returned information, the feedback information, the access information, the state information of the control center and the wireless access point; the control center obtains the flight plans, the data fusion results and the video splicing signals; and the FOD monitoring points obtain the foreign body confirmation instructions to confirm foreign body information. With the airport runway foreign matter monitoring system and method of the invention adopted, false alarm can be effectively reduced, and the reliability of a system can be improved.

The present invention provides a interactive wireless electric guide system, which includes emitting set and portable receiver, emitting set includes master controller MCU and guide information memory connecting with it, first radio frequency module; portable receiver includes digital signal processor, random memorizer, nonvolatile store, second radio frequency module, programmable logic device and playback module, the first radio frequency module controlled by main controller, second radio frequency module controlled by digital signal processor according to communication protocols automatic switchover frequency channel, so communication interactive is completed. The present invention has the advantage of low cost, easy to update system maintenance and guide information, realizing automatic recognition sight by user end, taking photo at any time, standard, personalized and intelligentize of tour serves are realized.

The invention discloses a monitoring and sampling underwater robot for oceans or inland rivers and lakes. The system is composed of an underwater system and an onshore control system. The underwater system comprises an underwater robot main body, a positioning and navigation system, an intelligent monitoring system, an intelligent multi-point water sample collection system, an intelligent mud sample collection system, an intelligent operation and pushing system and an intelligent image processing and transmission system. The underwater system is controlled and communicated by the onshore control system through an umbilical cable; the positioning and navigation system, the intelligent monitoring system, the intelligent multi-point water sample collection system, the intelligent mud sample collection system and the intelligent image processing and transmission system are respectively connected to the intelligent operation and pushing system through wires, and the intelligent operation and pushing system is communicated with the onshore control system through the intelligent image processing and transmission system by adopting an umbilical cable. By utilizing the structural advantagesof the open frame type underwater robot, the working efficiency of underwater monitoring, sampling, salvaging and other operations is improved, all-around service is provided for underwater engineering, and the life safety of a diver is protected.

The invention discloses an intelligent indoor patrol robot. The intelligent indoor patrol robot comprises a traveling mechanism, an autonomous navigation system, a fixed-point operating system, a maincontroller and a lithium battery pack, wherein the autonomous navigation system is used for guiding the traveling mechanism to advance correctly along a preset route; the fixed-point operating systemis used for patrolling the preset position; and the fixed-point operating system comprises an RFID reader, the RFID reader and radio frequency marking cards with compiled program commands cooperate to perform program pre-marking on the positions needing fixed-point operation during the patrolling work, and different patrol operations are conducted by recognizing the radio frequency marking cars with the different program commands. The invention further discloses an intelligent indoor patrol system. By means of the intelligent indoor patrol robot and system, the degree of automation of patrolis increased, and the patrol efficiency is high.