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1017 results about "Transmission time delay" patented technology
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Radio over fiber system and method for controlling transmission time
InactiveUS20080056167A1Improve performanceRadio-over-fibreElectromagnetic repeatersRadio over fiberCommunications system
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.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and wireless communications systems using coordinated transmission and training for interference mitigation
InactiveUS7058146B2Reduce the impactAdequate levelSpatial transmit diversityPolarisation/directional diversityMultiplexingPresent method
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.
Owner:INTEL CORP
Method, system and device for time synchronous transfer
ActiveCN101515831AReduce synchronization errorTime-division multiplexRadio transmission for post communicationTime informationTime deviation
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.
Owner:NEW H3C TECH CO LTD
System and method for synchronizing microcellular network basestation and base station
InactiveCN101075848ALow costRadio/inductive link selection arrangementsRadio transmission for post communicationWork periodMacro base stations
The method comprises: the macro base station broadcast network side creates an absolute time; the micro base station gets the transmission time delay between itself and the macro base station, and uses the transmission time delay and the absolute time of said network side to adjust its local working time to complete the time synchronization. The invention also reveals a system thereof, a micro base station and a macro base station.
Owner:CHANGZHOU XIAOGUO INFORMATION SERVICES
Method for Adaptive Discontinuous Reception Based On Extented Paging Indicator for Improvement of Power Effective Performance at Mobile Terminal on WCDMA
ActiveUS20090040955A1Significant power saving effectPower managementTransmission systemsCode division multiple accessDiscontinuous reception
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.
Owner:ELECTRONICS & TELECOMM RES INST
D2D data package transmission method and apparatus, transmitted resource allocation methods and apparatuses
ActiveCN105517168ARealize transmissionAvoid retransmitting dataWireless communicationComputer hardwareTransmission time delay
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.
Owner:DONGGUAN COOLPAD SOFTWARE TECH
Modeling Method of Combined Heat and Power Optimal Dispatching Model
ActiveUS20180356105A1Promote absorptionSolve the real problemFuel heating with wind energySimulator controlCogenerationEngineering
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.
Owner:SOUTHEAST UNIV
Prediction-based routing method at intersection in vehicle self-organizing network
InactiveCN102137462AShort transmission distanceGuaranteed normal transmissionAssess restrictionTransmissionIn vehicleTransmission time delay
The invention discloses a prediction-based routing method at an intersection in a vehicle self-organizing network, and mainly solves the problem that when a packet is routed at the intersection, a link is unstable in the prior art. The scheme for implementing the method is that: when the packet arrives at a previous hop node of the intersection, the node predicts the next intersection to which the packet is transmitted; a weight of each adjacent intersection is calculated according to the density of adjacent road sections and a distance from the next intersection to a destination, and the intersection with the largest weight is selected as the next temporary destination for transmitting the packet; and when the packet is forwarded in a greedy mode in the road section, if the selected nodeis positioned in the boundary of the transmission range and is opposite to a driving direction of the transmitting node, a node secondarily nearest to the destination is selected, otherwise the packet is directly forwarded to the selected node. Compared with the geographic routing in city scenarios (GPCR) protocol and the greedy perimeter stateless routing for wireless networks in urban vehicularscenarios (GpsrJ+ protocol), the method has the advantages that: the transmission rate of the packet is increased, the transmission time delay of the packet is reduced, and the method can be applicable to the vehicle self-organizing network.
Owner:XIDIAN UNIV
Lip synchronous method for multimedia real-time transmission in packet network and apparatus thereof
InactiveCN1949879AAnti-jitterHigh synchronization accuracyPulse modulation television signal transmissionTransmissionPacket generatorTransmission time delay
The invention relates to multimedia real-time transmission in packet network, disclosing a lip synchronizing method and device for multimedia real-time transmission in packet network, able to simply and effectively regulate to overcome network dithering and variation and implementing lip synchronization of audio and video streams. And it sets buffers which can flexibly regulate buffering time length according to network time delay information and implement synchronization of audio and video streams by regulating their buffering time lengths; it sets a time delay detection module to detect transmission time delays of audio and video data in packet network and then uses synchronizing module to refer to their average transmission time delay and transmission time delay so as to synchronize audio and video modules; it uses the synchronizing module to calculate buffer-storing time lengths of audio and video buffers and flexibly sets them to resist network transmission dithering; it makes one of the audio and video parties regularly transmit synchronous time reference point to the other one so as to coordinate their synchronization.
Owner:HUAWEI TECH CO LTD
Dynamic migration method of video tasks in edge computing environment
ActiveCN108509276AIncrease profitReduce overheadProgram initiation/switchingResource allocationTask analysisService experience
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.
Owner:NANJING UNIV OF TECH
Wireless self-organized network-based integrated heterogeneous emergency communication network
InactiveCN102006574AAchieving Network InvulnerabilityAchieve reliabilityNetwork topologiesWireless commuication servicesStructure of Management InformationEmergency situations
The invention discloses a wireless self-organized network-based integrated heterogeneous emergency communication network. The emergency communication network comprises a layered framework, a layered framework-based system structure and a layered framework-based network structure, wherein the layered framework consists of a communication network layer, an information acquisition layer, a distributed computation layer and an application service layer sequentially from bottom to top; the system structure consists of a network infrastructure layer, a public service layer, a specific functional layer and an application system layer sequentially from bottom to top; and the network structure is a layered three-dimensional communication network structure. The emergency communication network provided by the invention can adapt to various emergency network deployment situations, can provide network capacity and a coverage area at any given time or place as required, can be conveniently expandedto a network of a required scale, enhances situational perception capability of an emergency occasion by comprehensively utilizing various communication measures, shortens transmission time delay andcall establishment time, can support the requirement on the performance of various services and expands the communication ranges and service support capabilities of various user groups on different emergency occasions.
Owner:PLA UNIV OF SCI & TECH
Method for implementing split-second precision synchronism using spread-spectrum answering machine
ActiveCN101494495AHigh precisionSave onboard resourcesPosition fixationRadio transmissionTransmission time delayTime difference
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.
Owner:AEROSPACE DONGFANGHONG SATELLITE
Model self-adapting sheet shape prediction and control method
ActiveCN101758084AEnsure consistencyHigh yieldProfile control deviceAdaptive controlTransmission time delayFeedback controller
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.
Owner:BAOSHAN IRON & STEEL CO LTD
Band width distribution method and device for wireless communication network
InactiveCN101155093AData switching by path configurationRadio/inductive link selection arrangementsNetworked systemBand width
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.
Owner:HUAWEI TECH CO LTD +1
Satellite mobile communication random access method and system capable of compensating time in advance and medium
ActiveCN109788548ASolve time-consuming problemsReduce consumptionSynchronisation arrangementNetwork topologiesTransmission time delayTime cost
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.
Owner:SHANGHAI JIAO TONG UNIV
Router and transmission method thereof on packet-circuit switching chip
InactiveCN101778049AReduce transmission delayEasy to implementData switching networksAddress decoderCrossbar switch
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.
Owner:NANJING UNIV +1
LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method
ActiveCN107333241ASolve design problemsImprove the first-time success rate of accessSynchronisation arrangementRadio transmissionSequence designTransmission time delay
The invention relates to the field of broadband satellite communication and navigation, in particular to an LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method. According to the LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method, the satellite LTE uplink timing synchronization problem is solved, and the process that in LTE, receiving terminal timing synchronization is conducted by means of TA (timing advance) is omitted; and meanwhile, the leader sequence design and detection problems caused by large user transmission time delay differences in satellite beams are solved, the one-time success rate of user access is increased, the influences of Doppler frequency shift on uplink timing synchronization are reduced, and the signal transmission efficiency is improved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Differential protection system and differential protection method for flexible DC distribution network line
ActiveCN106099879AHigh data time synchronizationAccurately capture transient componentsEmergency protective circuit arrangementsTransmission time delayData acquisition
A differential protection system and a differential protection method for a flexible DC distribution network line are provided. An FPGA-based protection device sends a sample pulse to a data collector. To achieve synchronized sampling and data window synchronization, line dual-end protection devices are arranged as a reference end and a following end respectively. The following end firstly sends a synchronization request command including a number of a sample and a corresponding time of the sample. The reference end returns information including a sample number and a corresponding sample time of the reference end after receiving the command sent by the following end. After receiving a corresponding data message of the reference end, the following end calculates a communication transmission time delay and a deviation between the sample times of the two sides. Through compensation of the communication transmission time delay and a secondary interpolation sampling synchronization method, synchronized sampling of the following end and the reference end is achieved. Through calculating the differential current of two ends of a direct current line, the method determines whether differential current protection criteria are satisfied and achieves differential protection of the direct current line. The system and the method can ensure correct actions on internal faults and correct non-actions on external faults.
Owner:SHENZHEN POWER SUPPLY BUREAU +1
Detection system for repeater product radio frequency performance, and detection method thereof
InactiveCN101453276AQuick testTest accurateTransmitters monitoringReceivers monitoringTest performanceEngineering
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.
Owner:COMBA TELECOM SYST (GUANGZHOU) LTD
Method and device for determining communication path
ActiveCN103888981AIncrease transfer rateImprove transmission efficiencyNetwork topologiesRadio transmissionTransmission time delaySmall cell
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.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Acceleration method and system for online game and online game acceleration server
ActiveCN103957208AImprove web experienceReduce transmission delayVideo gamesTransmissionData matchingData connection
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.
Owner:BEIJING QIHOO TECH CO LTD
Wireless communication system and method for flat network architecture and extend unit
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.
Owner:COMBA TELECOM SYST CHINA LTD
Post Compensation Method for Transmission Time Delay in Optical Fiber Time Transfer
InactiveCN102299743ACascading convenienceLong-distance and accurate synchronization of transmission timeDistortion/dispersion eliminationRadio-over-fibreTime informationTime delays
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.
Owner:NAT TIME SERVICE CENT CHINESE ACAD OF SCI
Service scheduling method and service scheduling device
ActiveCN101686196AGuaranteed QoSImprove scheduling abilityError prevention/detection by using return channelData switching networksCommunications systemTransmission time delay
Owner:DATANG MOBILE COMM EQUIP CO LTD
Data transmission method in opportunity network
InactiveCN101222438AReduce network transmission delayReduce energy consumptionEnergy efficient ICTData switching networksTransmission time delayMobile device
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.
Owner:BEIHANG UNIV
Report method and device for buffer state report
ActiveCN107872885AAvoid the problem of insufficient resources availableGuaranteed resourcesNetwork traffic/resource managementConnection managementTime delaysTransmission time delay
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.
Owner:HUAWEI TECH CO LTD
Confirmation information feedback method
ActiveCN101267285AReduce transmission delayImprove performanceError prevention/detection by using return channelTransmission time delayComputer science
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.
Owner:ZTE CORP
Link adapting method based on AMC-ARQ (Adaptive Modulation and Coding-Automatic Repeat-reQuest) striding layer
InactiveCN102752087AReduce the amount of informationAccurate calculationError prevention/detection by using return channelQuality of serviceFrequency spectrum
The invention relates to a link adapting method based on an AMC-ARQ (Adaptive Modulation and Coding-Automatic Repeat-reQuest) striding layer. The link adapting method comprises the step of designing a mapping relation of a receiving SNR (Signal to Noise Ratio) of a physical layer and MCS (Modulation Coding Scheme) by utilizing a QoS (Quality of Service) demand of a data link layer and the information of the physical layer according to a target packet error rate of the physical layer. According to an ergodic method, the optimal packet error rate of the physical layer, the maximum retransmission times of the ARQ of the data link layer and the size combination of a rearranging timer of the data link layer are searched, so that the use ratio of effective frequency spectrum is maximal. According to the link adapting method provided by the invention, the physical layer and the data link layer are comprehensively considered; the correlation influence of the parameters between the two layers is fully utilized to obtain AMC and ARQ parameters; the optimal parameter combination for maximizing the efficiency of the effective frequency spectrum is obtained; and the time delay is calculated by dividing the time delay into two parts of a queuing time delay and a transmission time delay, so that the calculation for the time delay is more accurate. According to the link adapting method provided by the invention, the selection for a modulation coding mode is relative to a channel condition and transmission times, and the redundant information transmitted at each time is fully utilized.
Owner:HUAZHONG UNIV OF SCI & TECH
Multi-stream business concurrent transmission control method and device
InactiveCN103841041AAvoid congestionAvoid retransmissionData switching networksCommunication interfaceTransmission time delay
The invention discloses a multi-stream business concurrent transmission control method and device, and defects of unnecessary data retransmission caused by the fact that aggregation bandwidth resources cannot be fully utilized in transmission of utilizing multiple links by a terminal device carrying multiple communication interfaces are overcome. A sending end executes the following processing in the method: link information of each link between the sending end and a receiving end is acquired; transmission time delay of each link is predicted according to the link information of each link so that a transmission time delay estimation value of each link is acquired; a sequence of arrival of data packets at the receiving end on each link is calculated and predicted according to the transmission time delay estimation value of each link; and the distribution situation of the data packets on each link is scheduled according to the sequence of arrival of the data packets at the receiving end on each link. Unnecessary retransmission and link bandwidth congestion caused by disorder of the receiving end can be avoided by the embodiment of the invention.
Owner:ZTE CORP
Method for measuring image transmission time delay
ActiveCN101668223AVersatilityReduce complexityPulse modulation television signal transmissionTransmission time delayTime delays
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.
Owner:SPACE STAR TECH CO LTD
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