3125 results about "Data transmission" patented technology

Data transmission (also data communication or digital communications) is the transfer of data (a digital bitstream or a digitized analog signal) over a point-to-point or point-to-multipoint communication channel. Examples of such channels are copper wires, optical fibers, wireless communication channels, storage media and computer buses. The data are represented as an electromagnetic signal, such as an electrical voltage, radiowave, microwave, or infrared signal.

Network monitoring device, bus system monitoring device, method and program

A network monitoring device which monitors a network in which data is transmitted through relays, includes a monitoring frequency recording unit (111) which records monitoring frequencies for monitoring transmission statuses of the relays, a selection probability generating unit (112) which generates selection probability information which is probability values for the relays, a monitoring object determining unit (113) which determines, according to the monitoring frequency and the selection probability information, a relay the transmission status of which is to be monitored, a transmission status obtaining unit (106) which obtains transmission status information indicating a transmission status on the relay determined, a transmission status recording unit (107) which records the transmission status information, an activation level calculating unit (109) which calculates, using the transmission status information, activation level indicating suitability of the monitoring on the transmission statuses of the relays, and a monitoring frequency updating unit (110) which updates, based on the activation level, the monitoring frequency, and the network monitoring device detects the change in throughput on a data transmission path highly responsively.

Method and devices for efficient data transmission link control in mobile multicast communication systems

A method for a data transmission with ARQ protocol using multicast groups such as GSM, GPRS or UMTS in a mobile communication system is described. Data is transmitted in data blocks (PDU) from a transmitter (T) to a plurality of receivers (R1-RM), said data blocks (PDU) being identifiable by an identification (e.g. a sequence number). The receivers (R1-RM) send status indications to the transmitter (T) whether a data block (PDU) is correctly received. The transmitter (T) is adapted to perform retransmissions according to the status indications and has a transmission window comprising the transmission status for the data blocks (PDU) according to their identification. In the method, a synchronization to the transmitter (T) is performed for at least one first of said receivers (Ri), wherein a range of identifications of transmitted data block (PDU) is selected in said synchronization. The transmitter (T) deletes the transmission status for the selected range of identifications from the transmitter window and the first receiver (Ri) stops sending status indications for the data blocks (PDU) corresponding to the selected range of identifications. In addition, a transmitter and a computer program implementing the method are described. As an example the transmitter can be a RNC extending the RLC and MAC-HSPDA protocols standardized by 3GPP for obtaining efficient and reliable point-to-multipoint radio links.

Distributed database synchronization system, synchronization method and node management method

InactiveCN102693324AFix compatibility issuesSolve the problem of not being able to synchronize with each otherSpecial data processing applicationsData transmissionHeterogeneous network
The invention discloses a distributed database synchronization system which comprises database nodes and a management node, wherein the database nodes outwards provide distributed database access, updating and inquiry services on the basis of Web services; all the database nodes have no master-slave difference, and are independently in charge of providing distributed database services; all the database nodes have no direct relationships and periodically obtain a synchronization configuration table and a network member configuration table from the management node, and establish a synchronization relationship with other database nodes; and a Web-service-based synchronization module is adopted in all the database nodes, the traditional database is encapsulated by using the synchronization module for providing one group of API (Application Program Interface) function for the outside. Data transmission is carried out by using the Web-service-based SOAP (Simple Object Access Protocol). The distributed database synchronization system can adapt to various complex heterogeneous networks, and can be used for solving the problems of incompatibility and incapability of mutual synchronization of data among various traditional databases.

Uplink scheduling method and uplink scheduling device

The invention provides an uplink scheduling method as well as a terminal and a base station. The uplink scheduling method comprises the steps: detecting whether a non-authorized carrier is occupied or not by the terminal after the terminal receives a first uplink scheduling instruction transmitted by the base station, and executing the first uplink scheduling instruction by the terminal when the non-authorized carrier is not occupied, so only when the non-authorized carrier is idle, the terminal can execute the instruction for utilizing the non-authorized carrier to transmit the uplink data; or detecting whether the non-authorized carrier is occupied by virtue of the terminal to obtain a detection result, transmitting the detection result to the base station, transmitting a first uplink scheduling instruction to the terminal by the base station when the detection result indicates that the non-authorized carrier is not occupied, wherein the first uplink scheduling instruction is used for instructing the terminal to utilize the non-authorized carrier to transmit the uplink data, so only when the non-authorized carrier is idle, the base station can transmit the uplink scheduling instruction for utilizing the non-authorized carrier to transmit the uplink data, therefore, the failure in transmission of the uplink data caused by the occupation the non-authorized carrier can be avoided.

Electric energy acquisition and operation management system and method based on platform zone centralized service terminal

ActiveCN101354408AImplement anomaly monitoringRealize electricity consumption monitoringTransmission systemsElectrical testingRadio frequencyData transmission
The invention provides an electric energy collecting and running management system on the basis of a station area concentrative service terminal, and a method thereof. The electric energy collecting and running management system is provided with a master system, a station area concentrative service terminal, an electric energy meter collector, a station area electric energy meter and a resident electric energy meter; the master system is in charge for services such as data collecting, processing, managing and analysing, output and the like; the running state of the system is monitored and undated; two communication channels such as GPRS or CDMA and RS232 are used between the master system and the station area concentrative service terminal; the station area concentrative terminal has the functions of distribution transform monitoring, electric usage site management, meter concentrator meter reading and the like; the downlink selects a RF narrowband wireless radio frequency data transmission/power carrier/RS483 interface to be communicated with the electric energy meter collector; meter reading task is sent down to the electric energy meter collector; the terminal collects the electric meter information read by various collectors and analyses all electric meter information; and the uplink transmits all data to the master system by the GPRS/CDMA channels.

Providing a presentation on a network having a plurality of synchronized media types

InactiveUS7412533B1Establish and control involvementTelevision conference systemsAnalogue secracy/subscription systemsData transmissionReduced size
A presentation system is disclosed for synchronizing a performance of a plurality of presentation content portions at a network node, wherein, e.g., when two such content portions are to be presented concurrently at the network node, at least one is delayed until the other such portion can be presented concurrently therewith. That is, these two portions may be received by the network node at times sufficiently far apart so that the earlier received content portion must have its presentation appropriately delayed in order to be presented concurrently with the second content portion. In one embodiment, the content portions are transmitted via at least a portion of the Internet to a plurality of network nodes, wherein the presentation system can distribute the presentation content data to the network nodes via a plurality of network routes and presentation formats. In particular, a first portion of the content data may be provided as slides in, e.g., HTML, while a second portion of the content data may be provided as an audio/video stream. Additionally, the present invention can provide various portions of the content data from a plurality of network server nodes, and during a performance of the presentation, the presentation receiving network nodes can determine a particular variation of the presentation to retrieve from the network server nodes. In particular, the retrieval of presentation data depends upon the transmission characteristics of the network such as data transmission rate. Thus, if a low transmission data rate is detected at a first network node, presentation elements of a reduced size can be retrieved. Alternatively, if a higher transmission rate is detected at a second network node, presentation elements of greater size (and corresponding enhanced quality of presentation) can be retrieved. Thus, within a single performance, network nodes with varying available network bandwidths can synchronously and simultaneously provide the presentation.
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