1015 results about "Transmission time delay" patented technology

A radio-over-fiber (RoF) system and method for controlling a transmission time is provided. In a Time Division Duplex (TDD) wireless communication system comprising a Base Station (BS) having a donor and a remote connected thereto via am optical fiber, upstream and downstream Radio Frequency (RF) signals are transmitted and received, and by reliably transmitting a switch control signal to the remote and simultaneously compensating for a transmission time delay occurring in the optical cable, time synchronization of the upstream and downstream RF signals transmitted and received via antennas of the BS and the remote is controlled, thereby efficiently increasing the performance of a TDD wireless service system.

A method for interference mitigation in a wireless communication system having multiple transmitters and receivers by introducing transmission time delays between the transmission of signals from the individual transmitters to ensure coherent reception of the signals at a specific point in the coverage area, such as at a center of distribution of the receivers. To further aid in interference mitigation the signals are assigned training patterns chosen to be distinguishable by the receiver and to optimize interference mitigation. The training patterns can be selected based on a feedback parameter, e.g., a measure of the quality of interference mitigation obtained from the receiver. The present method can be used in wireless communication systems which re-use frequencies including TDMA, CDMA, FDMA, OFDMA or other multiplex communication systems using a multiple access method or a combination of such methods.

The invention discloses a method for time synchronous transfer, which comprises the following steps: transmitting a synchronous pulse and transmitting time information of a main device by the main device; receiving the synchronous pulse and recording received time information of a slave device by the slave device; acquiring the transmission time delay of the synchronous pulse; determining the time deviation between the main device and the slave device by the slave device according to the transmitted time information of the main device, the received time information of the slave device and thetransmission time delay; and adjusting a local synchronous clock by the slave device according to the time deviation. The invention also discloses a system and a device for the time synchronous transfer. The method, the system and the device obtain the synchronous errors among devices and compensate the clock according to the synchronous errors so as to reduce the synchronous errors caused by thetransfer time delay of PPS and ensure that the synchronous errors of the cascade connection of a multilevel device are still lower than microsecond level.

An extended paging indicator-based adaptive discontinuous reception method is proposed so as to improve a power saving performance of a terminal in an asynchronous wideband code division multiple access schemes. To this end, a plurality of terminals for performing power saving receive an extended paging indicator for a discontinuous reception cycle, conform a type of a bit Run for configuring the extended paging indicator, and change the discontinuous reception period. In addition, the terminals set the discontinuous reception period update factor value to be varied according to the extended paging indicator as an initial value so as to determine a next paging occasion block, change the discontinuous reception period update factor value according to the paging indicator of the bit Run received from base station, and change the discontinuous reception period according to the variance of the discontinuous reception period update factor value. The extended paging indicator-based adaptive discontinuous reception method may improve transmission time delay and transmission failure probability performances for packet reception as well as a power saving performance in comparison with a conventional fixed discontinuous reception method.

Embodiments of the invention provide a D2D data package transmission method and apparatus, transmitted resource allocation methods and apparatuses. The method comprises the steps of setting a plurality of data package copies of a D2D data package; determining transmitting frequency of each data package copy, wherein transmission frequencies of all data package copies are different; and transmitting each data package copy at corresponding transmission frequency. According to the D2D data package transmission method, small data transmission time delay can be realized, so that a good time delay control purpose can be achieved.

A CHP optimal dispatching model is a mixed integer programming model and is used for a district heating system (DHS) comprising a heat source, a heating network and a heat load, and the heating network comprises a heat transmission network and a heat distribution network. A plurality of heating areas is divided, and one day is divided into a plurality of time periods; the heat transmission loss of the heat distribution network is omitted, and a heat transmission network model taking transmission time delay of the heating network into consideration is established according to the heat transmission network; a terminal heat consumer model capable of reflecting indoor temperature is established; and a combined optimal dispatching model comprising conventional generators, wind power units, CHP units, electric boilers and heat storage tanks is established.

The invention discloses a dynamic migration method of video tasks in an edge computing environment. Multiple ECNs (Edge Compute Nodes) are selected in an ECN cluster under the edge environment to runa task scheduling migration scheduler to be responsible for distribution and scheduling work of the tasks, and the other ECNs in the cluster undertake task migration work and provide computing resources. The computing task migration scheduler executes task migration decision in each scheduling cycle to determine whether the tasks are executed locally in the ECNs or migrated to a data center, and tasks needing to be migrated to the data center are directly sent to a task execution unit of the remote-end data center through an ECN transmission unit for analysis processing. According to the method, the tasks are dynamically scheduled and processed on the basis of meeting network bandwidth and calculation costs, goals of reducing transmission time delay of edge data and improving task analysisprocessing speed are achieved, thus low delay time and high response of a task migration process are effectively guaranteed, and video service experience of users is improved while higher video service quality is realized.

The invention relates to a method for realizing high-precision time synchronization by utilizing a spread spectrum transponder. The method comprises the following steps: (1) test equipment for ground test and control transmits an up measuring frame to the spread spectrum transponder; (2) the spread spectrum transponder carries out sampling to the up measuring frame, extracts up pseudo-range information and inserts the up pseudo-range information to a down measuring frame and then transmits the down measuring frame to the test equipment for ground test and control; (3) the test equipment for ground test and control obtains the time Ts on the satellite from the down measuring frame, records the ground time Tg corresponding to a falling edge or a rising edge of a certain position of frame synchronous code of the down measuring frame, simultaneously measures transmission time delay DeltaTR of the up measuring frame and the down measuring frame and calculates the transmission time delay tauR of one-way distance; (4) Tg-Ts-tauR is calculated to obtain the time difference DeltaT of the satellite and the ground; and (5) the test equipment for ground test and control transmits an up modulation signal containing DeltaT to the spread spectrum transponder; and time reference equipment on the satellite carries out relevant adjustment according to the DeltaT sent by the spread spectrum transponder. The invention realizes time synchronization of the satellite and the ground of nano second level.

The invention relates to a sheet shape control method for strip rolling. A model self-adapting sheet shape prediction and control method comprises the following steps: a sheet shape decomposition method and a sheet shape control model are given, and the input signals of the sheet shape control model include a rolling force and a crown of incoming material; then a sheet shape model which includes executing mechanism characteristics is obtained according to history sheet shape actual output data, the model is dynamically corrected according to real-time rolling parameters and corresponding actual sheet shape values, a correction model is used for accurately predicting the sheet shape and determining the optimal control quantity, and a feedback path, which removes transmission time-delay of strip steel between a frame and a measuring system, is established, thus carrying out regulation of a feedback controller in real time and ensuring rapid and dynamical sheet shape control. As the sheet shape control model is corrected in real time according to actual data, constantly changing actual conditions of the sheet shape model of a rolling mill are satisfied, thus predicting the sheet shape more accurately to increase the control accuracy of the sheet shape.

The invention provides a bandwidth distribution method of communication network. A token value of bandwidth request queue of each priority operation is counted. The operation of certain grade is judged whether the operation is at flux peak or not, based on the obligated sum of bandwidth of actual request and the token value of bandwidth request queue of the bandwidth request queue, if the operation is at the flux peak, the token value of bandwidth request queue of each grade operation is redistributed; and then according to the order from high priority operation to low priority operation, the bandwidth request of each grade operation is treated in turn. The invention also provides a device of the said method. The said method and device can dynamically adjust the bandwidth source distribution directly towards the flux of operation of each grade, and reduce the transmission time-delay of the whole network system, at the same time increase the communication quality of the communication operation, with little effect on the justice of the bandwidth source distribution.

The invention provides a time advance compensation satellite mobile communication random access method and system and a medium, and the method comprises the steps: a downlink broadcast sending step: obtaining a cell formed by a wave beam of a satellite on the ground, obtaining the minimum TA in the cell, recording the minimum TA as TAmin, and enabling the satellite to send satellite position information and TAmin in the downlink broadcast; And a transmission delay calculation step: enabling the UE to receive the downlink broadcast, obtaining the satellite position information and the TAmin according to the received downlink broadcast, and calculating the difference value TAdiff of the TA estimated by the UE per se relative to the TAmin. In the random access process of the satellite, the transmission time delay is estimated in advance at the UE side and compensation is performed when the PRACH is sent, so that the problem of high time cost caused by long time delay in the random accessof the satellite is solved, and the consumption of uplink resources by the PRACH is greatly reduced.

The invention discloses a router and a transmission method thereof on a packet-circuit switching chip forming networks on chips. An input state device in the router controls the work state of an input channel and transmits received requisite signals to a priority encoder; the priority encoder encodes the request signals according to the set fixed priority and transforms input target node address signals to route direction signals by an address decoder to be output; an arbiter receives decoding results of the address decoder, outputs interconnected signals of an input port and an output port and occupation signals of the input port according the sequence of the fixed priority and the occupation condition of the ports until selecting a proper route to reach the target node; and a crossbar switch receives the interconnected signals output by the arbiter and realizes the correct interconnection between the input port and the output port. The invention has the advantages of little resource consumption and small transmission time delay. The invention is suitable for forming networks on chips with high performance, and can be applied to complicated systems on chips adopting on-chip network structure.

The invention discloses a detection system for radio frequency performance of a repeater product, which comprises a control computer, a testing instrument unit, a signal control unit and tested equipment. The control computer is respectively connected with the testing instrument unit, the signal control unit and the tested equipment through communication cables, and is also connected with a printer through a data wire. A method for realizing the detection system comprises the steps of starting the detection system, calibrating the system, connecting the tested equipment, automatically testingvarious radio frequency indexes, saving test data, disconnecting the tested equipment, performing system inquiry, exporting a test report form, closing the detection system and so on. The detection system can automatically, accurately and quickly test performance indexes of the repeater product such as maximum gain, output power, in-band fluctuation, noise factor, transmission time delay and so on, and form a report form with a unified form to be convenient for the maintenance and management of engineering personnel.

The invention discloses a method and device for determining a communication path. The problem that an existing path which is configured for a small cell needing to be connected into a network and directly communicates with a wireless channel between macro stations probably makes transmission efficiency low and transmission time delay lager is solved. The method includes the steps that when a wireless node needs to be connected into the network, an optimal communication path from the wireless node to the network is acquired; the wireless node communicates with the network through the acquired optimal communication path, wherein the optimal communication path instructs the wireless node to be connected into the network through at least one auxiliary node, and the at least one auxiliary node in the auxiliary nodes is a wired node which directly communicates with the network. Due to the fact that the at least one auxiliary node which can provide the data forwarding service function for other nodes is connected into the network and communicates with the network, transmission quality and performance of data between the wireless node needing to be connected into the network and the network are improved, and transmission efficiency of the wireless node is improved.

The invention provides an acceleration method and system for an online game and an online game acceleration server. The acceleration method for the online game includes the steps that online game data from a client side are obtained; a transmission line matched with the online game data is inquired through a preset online game server database, and kinds of online game server information and corresponding transmission line information are stored in the online game server database; through the inquired transmission line, a data connection path of a target online game server from the client side to the online game data is established so that the online game data can be transmitted. According to the technical scheme, the transmission line matched with the data of the online game operated by the user is automatically selected, through optimizing the transmission line, transmission time delay is reduced, and network experience of the user is improved.

The invention discloses a wireless communication system and a wireless communication method for a flat network architecture, and an extend unit. The wireless communication system comprises access unit (AU) subsystems, the EU and at least one radio remote unit (RU) connected with the EU. The EU is used for converting a downlink baseband high-speed signal transmitted by the AU subsystem into a downlink sub-baseband low-speed signal, and transmitting the downlink sub-baseband low-speed signal to the RU, so that the EU can be connected with the RU by a low-speed transmission link such as a category-5 cable, indoor coverage is facilitated, and difficulty and cost in network deployment are reduced; the wireless communication system supports the concatenation and stacking mode of the AU subsystems, so that the capacity extensibility of the system is improved; and in addition, the wireless communication system also can comprise a gateway (GW) subsystem, and the function of a radio network controller (RNC) is shifted down to the GW subsystem and the AU subsystem to further disintegrate and simplify the structure of the whole communication system, so that a network processing time delay and a transmission time delay are shortened.

The invention relates to a post-compensation method for transmission time delay during optical fiber time transmission. The method comprises the following steps of: measuring bidirectional closed loop transmission delay deltaT during the optical fiber time transmission, calculating unidirectional transmission delay during the optical fiber time transmission, performing post-compensation on time transmission 1pps, and recoding and modulating a time signal at a user receiving end. Next-level time transmission is performed by the same method, so that cascade connection can be conveniently performed, and transmission time is remotely and accurately synchronized. Compared with the conventional pre-compensation method, the post-compensation method has the advantages that: different time information advance is not required to be set according to different levels, and pre-compensation devices of different levels are not needed, so the method is easy and convenient to operate; and the method has the advantages that the method is simple and practical, is high in reliability, and can be popularized and used in the optical fiber time transmission.

The present invention provides a data transmission method in an opportunity network. When the network partial region topology is relatively stable, the method adopts a policy aided routing that a mobile device creates a communication domain by self-assembly; if a mobile device having message encounters any mobile device in the connected domain, the message can be forwarded to a mobile device which has maximum possibility to encounter the target device so as to reduce transmission time delay; meanwhile, in the data transmission process, the method integrates a transmission strategy based on duplication and a transmission strategy based on perceptive information; the duplication and forwarding conditions of the data is dynamically adjusted according to the sensed network status information; under the condition of ensuring a certain transmission success rate, the energy consumption and network load of the mobile device is reduced during the data transmission process, the forwarding efficiency among the mobile devices is enhanced, the practicality of the data transmission in an opportunity network is enhanced, and good network support is provided to the mobile P2P application of superior.

A report method and device for buffer state report is used for reducing transmission time delay of uplink data having high time delay requirements. The method includes that a terminal determines a first logic channel used for transmitting first-type service data, wherein the data processing time length required by the first type service data is smaller than a first set threshold value; the terminal is triggered based on the first logic channel and sends a first buffer state BSR to a base station and receives first uplink resource allocated for the first logic channel when the first logic channel has the first type service data that can be used for sending; the terminal occupies the first uplink resource and sends the first type service data.

The present invention presents a confirmation information feedback method. The method comprises the following procedures: dividing a plurality of descending sub-frames into two descending sub-frame groups, and informing two divided descending sub-frame groups and the sequence numbers of the descending sub-frames which are included in each descending sub-frame group to a base station and a terminal, wherein, a plurality of descending sub-frames feed back the confirmation information in a same ascending sub-frame, and each descending sub-frame group at least comprises a descending sub-frame; and feeding back the data of the descending sub-frame group by the terminal with the indication field in the ascending physical control channel corresponding with two descending sub-frame groups. Through the invention, the transmission time delay of the system is reduced and the capability of the system is increased.

The invention discloses a method for measuring image transmission time delay, comprising the steps: (1) generating a time delay image sequence after a source image sequence to be measured is transmitted; (2) collecting the source image sequence and the time delay image sequence; recording the collecting time of each frame image of the source image sequence and the time delay image sequence in collection; respectively buffering each frame image of the collected source image sequence and the time delay image sequence; (3) matching each frame image in the buffered source image sequence with the buffered images in the time delay image sequence to obtain the best matching images; (4) subtracting the collecting time of the best matching images from the collecting time of the frame image in the source image sequence to obtain the transmission time delay of the frame image; (5) taking another frame image from the buffered source image sequence; repeating step (3) and (4); computing the transmission time delay of the frame image and (6) repeating step (5) and computing the average value of the obtained transmission time delay values as the transmission time delay of the image to be measured.

An automatic transfer switch includes first and second inputs inputting first and second voltages; a first output outputting a start signal; a first timer timing a first time after the second voltage is available; a second timer delaying for up to a second time before outputting a transfer signal, the second time being reduced by the first time when the second voltage is available; a transfer mechanism selectively electrically connecting one of the inputs to a second output; and a circuit cooperating with the inputs and the transfer mechanism, causing the start signal to be output responsive to the voltages not being available, and causing the transfer mechanism to electrically connect the second input to the second output in response to the transfer signal.