1063results about How to "Improve transmission reliability" patented technology

The invention discloses a channel-polarization-based encoder for a staggered structure duplication code, and an encoding method and decoding methods thereof. The encoder consists of a duplication bit buffer with a storage capacity of L bits, a bit position mapper with a length N and a channel polarization device with the length N which are connected in sequence. The encoding method based on the encoder comprises the following steps of: embedding duplicated encoding into a channel polarization process, and introducing a duplicated relationship between parts of the bits of code blocks transmitted in sequence during the channel polarization for encoding. In addition, the invention further provides two decoding methods, which comprise the following steps of: decoding by using a simple and rapid successive cancellation (SC) algorithm, and performing iterative decoding by using a Tanner-graph-based belief propagation algorithm with excellent performance. On the basis of the innovative structure encoder, the encoding and decoding methods provided by the invention are stronger in error correction capability under the condition of not increasing the decoding complexity, and the transmission performance is obviously improved. The encoding and decoding methods are particularly applicable to an actual communication engineering system and have a good popularization and application prospect.

The invention discloses a route exchange method suitable for a GEO / LEO double layered constellation network. According to the method, a system period is divided into equal-duration time sections based on a dynamic boundary value; a GEO layer satellite high in on-board processing capacity is used for calculating the best route and the second best route for each LEO satellite; in the processes of information transmission and exchange, when loads of the LED satellites are large, the GEO satellite shares part of low priority services in time for the LED satellites, and it is guaranteed that important information is reliably transmitted in real time; when link congestion, node ineffectiveness and other emergency conditions happen in the satellite network, in order to avoid rerouting of the whole network, and the GEO satellite only calculates rerouting for affected routes; after link congestion is eliminated, the LED satellites recover route information in time before congestion in order to avoid link resource waste in the network. In the network that topology time varying happens, links are prone to congestion, on-board resources are limited, continuous high-load flows are prone to being generated, and nodes are prone to being ineffective at the special period, the method can reduce constellation system cost, shorten convergence time, save the on-board resources, increase the utilization rate of the link resources, guarantee that important information is reliably transmitted in real time and improve invulnerability and robustness of the satellite network.

A communication device having asynchronous data transmission via a symmetrical, serial interface is described, having a microcontroller that exhibits a CAN controller and an asynchronous serial interface unit for receiving, processing, and outputting data; an asynchronous serial interface driver device for providing an asymmetrical data exchange with the microcontroller via the asynchronous serial interface unit, an asynchronous serial interface receiving line, an asynchronous serial interface transmitting line, and an external asynchronous serial interface port; a CAN driver device for providing a symmetrical data exchange with the microcontroller via the CAN controller, a CAN receiving line, a CAN transmitting line, and two external CAN ports; a connecting device between the CAN receiving line and the asynchronous serial interface receiving line, as well as between the CAN transmitting line and the asynchronous serial interface transmitting line for providing a symmetrical data exchange with the microcontroller via the asynchronous serial interface unit, the CAN driver device and the external CAN ports.

Disclosed is a method for determining transmission power of a second TFCI bit indicating transport format information of data on a downlink shared channel transmitted from a selected Node B to a UE in a mobile communication system including the UE existing in a handover zone and a plurality of Node Bs in an active set of the UE. The Node Bs transmit dedicated channel data including a first TFCI bit to the UE over dedicated channels. A first Node B transmits dedicated channel data over a dedicated channel and transmits downlink shared channel data over the downlink shared channel. The first Node B determines a transmission power level of the second TFCI bit to be higher than a ratio of transmission power of the dedicated channel data from a Node B transmitting only the dedicated channel data to transmission power of the first TFCI bit.

A method and system for enhancing transmission reliability of video information over a wireless channel is provided. The video information includes pixels, each having a plurality of components and each component including video information bits that are placed in sub-packets within a packet. Error detection information is determined for one or more sub-packets, and placed in the packet. Then the packet is transmitted from a transmitter to a receiver a wireless channel, wherein the receiver uses the error detection information per sub-packet to check for transmission errors and request retransmission of erroneous video information bits based on their perceptual importance.

The invention discloses a method and system for conducting long-range control on an intelligent terminal device. The method comprises steps of A detecting a local area network and judging whether detected local area network information comprises target local area network information or not, on yes judgment, conducting a step B, and on no judgment, conducting a step C; B conducting login authentication according to the target local area network information, then sending device control information to the intelligent terminal device through the local area network to control the intelligent terminal device; and C detecting a wide area network, logging in the wide area network to be detected, and conducting authentication, and sending device control information to the intelligent terminal device through the wide area network to control the intelligent terminal device. By means of the method and system, long-range control efficiency can be improved, and long-range control cost is reduced.

The invention embodiment discloses a method and a device for forwarding a data frame based on line bundle. The method for forwarding the data frame based on line bundle comprises the following steps: acquiring a first data frame transmitted by a user side or a network side; dividing the first data frame when the first data frame is greater than the maximum transmission unit MTU of any access linebundled to the user, wherein the sub data frames obtained from division are all less than or equal to the MTU; adding logical identifiers corresponding to the access line bundled to the user to the sub data frames; and transmitting a second data frame comprising the sub data frames and the logical identifiers of the sub data frames so that the data frame can be reformed after being received at anopposite end. The method and the device for forwarding the data frame based on the line bundle increase the bandwidth of the access line, prolong the transmission distance and improve the transmission reliability on the basis of ensuring the transmission quality of the access line.

In a data communication system, data is transmitted from a control device to a communication interface and from there via a communication bus to additional communication interfaces of trigger devices. The communication interface on the control device side has inputs, to which signals from said control device and a disarming switch can be assigned. The disarming switch can be circumvented by a bypass switch which is controlled by the control device. The state of the signal at the inputs of the communication interface on the control device side is transmitted to coresponding outputs of the communication interfaces of the triggger devices. A trigger device has a safety unit which is used to test at least one trigger unit, when the state of the signal of the outputs authorizes such a test and the trigger voltage source is not yet charged wth the full trigger voltage. In said state, the safety unit also blocks triggering as soon as the trigger voltage has been reached. The inventive system ensures a high degree of functional safety and flexibility.

The invention discloses a method for cooperation partner selection and precoding cooperative communications in a cellular communication system. The method comprises the following steps: (1) a user terminal with bad uplink channel quality sends a cooperative communication request to a base station; (2) the base station selects a partner terminal for the user terminal; (3) in a first frame of a cooperation period, the user terminal sends local data to the base station, and the base station and the partner terminal receive the data simultaneously; (4) in a second frame of the cooperation period, the partner terminal sends the local data to the base station, and the base station and the user terminal receive the data simultaneously; (5) in a third frame of the cooperation period, the user terminal and the partner terminal preprocess the relay data by a precoding matrix which is fed back by the base station, and send the relay data to the base station simultaneously; and (6) the base station judges the signals received in the transmission time slots of different frames in a combination way to obtain an estimated value of the sent signal. The method has the advantages of low complexity and high utilization rate of the system resources, and is used for the reliable data transmission in the cellular communication system.

A method of performing hybrid automatic repeat request (HARQ) in a multiple-antenna system includes receiving a plurality of codewords through an uplink channel, generating acknowledgment (ACK) / not-acknowledgment (NACK) signals respectively for the plurality of codewords, and transmitting the plurality of ACK / NACK signals through a downlink channel in association with a resource used in transmission of the uplink channel. ACK / NACK signals for each codeword in multiple antenna system can be transmitted.

Disclosed is a method and node apparatus for traffic protection of Optical Transport Network (OTN), including: setting a part of channels in one fiber as working channels used for carrying traffic in need of protection, and setting a part of channels in the other fiber with a reverse transmission direction as protection channels, the number of which is equal to that of the working channels, to form a one-to-one protection for the working channels; when a failure in an optical line of OTN is detected, determining a bridging node and a switching node in accordance with pre-designated protection strategy, bridging and switching the traffic to be transmitted through the failed optical line between the working channels and the protection channels at the determined bridging node and switching node. This invention can realize OTN protection based on two-fiber OMS shared protection ring, and improve the transmission reliability of optical networks.

The invention relates to a solar-powered ultra-high voltage line monitoring system, comprising a high-voltage side solar power supply, a high voltage line monitoring device, a low-voltage side solar power supply, a line monitoring host computer and a remote wireless intelligent monitoring system. The high-voltage side solar power supply and the low-voltage side solar power supply comprise solar batteries, rechargeable batteries and power management units; the high voltage line monitoring device and the line monitoring host computer comprise sensing units as well as data acquisition and recording units for detecting and processing field parameters of various lines; and the remote wireless intelligent monitoring system comprises a wireless communication unit and a monitoring system master station. The high-voltage side solar power supply, the high voltage line monitoring device, the low-voltage side solar power supply, the line monitoring host computer and the remote wireless intelligent monitoring system compose a field device which collects and records the running status and fault information of high-voltage lines through solar power and transmits the running status and fault information to the monitoring system master station through the remote wireless communication unit so as to provide real-time information for power line monitoring.

Rotary-wing aircraft or fixed-wing aircraft consisting of one or a plurality of rotors and / or one or a plurality of airscrews being caused to rotate by means of at least one shaft, the said aircraft comprising a distributed electric motor unit configured to ensure the propulsion and / or the lifting of the said aircraft by causing the said shaft to rotate, the motor unit being a distributed electric motor unit connected directly to the rotating shaft, no mechanism for the transmission of movement being interposed between the said CND unit and the said shaft, the distributed electric motor unit being composed of a plurality of stacked electric motor elements, each said electric motor element being connected directly to the rotating shaft and consisting of at least one fixed stator and at least one moving rotor capable of connection to the said rotating shaft in order to transmit to it a mechanical power of the following kind where: Pr=the nominal mechanical power necessary for the propulsion and / or for the lifting of the said aircraft, Pim=the maximum mechanical power capable of being delivered by the electric motor element on level i, to the rotating shaft, for instance Pim<Pr, Ki=the power derating of the electric motor element on level i, for instance 0≦ki≦1, Ki being a variable that is adjustable as a function of the undamaged number of electric motor elements and / or as a function of the nominal mechanical power necessary for the propulsion and / or for the lifting of the said aircraft at a moment in time t, n=the number of electric motor elements comprising the distributed electric, motor unit, for instance n≧2,—the axes of rotation of the moving rotors and of the rotating shaft being coaxial.

A user equipment (UE) located in a soft handover region transmits channel quality indicator (CQI) information bits for informing a Node B of quality of a downlink channel through a CQI field and a high speed pilot (HS-Pilot) field constituting a subframe of an uplink secondary dedicated physical control channel (DPCCH) in a code division multiple access (CDMA) communication system. The UE outputs a codeword of length 20 by coding the CQI information bits with a code of length 20, which is used when a high speed downlink packet access (HSDPA) service is not supported, and permutes 15 coded bits coded by the same code, as a code of length 15, which is used when the HSDPA service is supported, among 20 coded bits constituting the codeword, thereby locating the 15 coded bits in the CQI field, and permutes the 5 remaining coded bits to be located in the HS-Pilot field.

A method and system for enhancing transmission reliability of video information over a wireless channel is provided. The video information includes pixels, each having a plurality of components and each component including video information bits that are placed in sub-packets within a packet. Error detection information is determined for one or more sub-packets, and placed in the packet. Then the packet is transmitted from a transmitter to a receiver a wireless channel, wherein the receiver uses the error detection information per sub-packet to check for transmission errors and request retransmission of erroneous video information bits based on their perceptual importance.

A CTCS2-class train control system based on wireless locomotive signals is a pint-to-point system for transmitting the train control information via passive responder, regional rail circuit and wireless channel. It is composed of the locomotive carried equipment consisting of ATP device and wireless signaling device, and the ground equipment consisting of wireless signaling device, responder, rail circuit ZPW2000, interface for computer or electric centralizing linkage 6502, and interface for train scheduling and command system or scheduling centralizing system (TDCS or CTC).

The invention discloses a method and device for processing an acknowledgement (ACK) / negative acknowledgment (NACK) feedback bit. The method comprises the following steps: user equipment (UE) receives data in N downlink carriers and M downlink subframes; when determining that semi persistent schedule (SPS) physical downlink shared channel (PDSCH) transmission which does not correspond to a physical downlink control channel (PDCCH) does not exist in one downlink carrier, or SPSPDSCH transmission which dose not correspond to the PDCCH exists in one downlink carrier, and the receiving the PDCCH of which the downlink allocation index (DAI) value is equal to M, the UE carries out mapping on the ACK / NACK feedback information of the downlink carrier by adopting a first class mode; and when determining that the SPSPDSCH transmission which does not correspond to the PDCCH exists on the downlink carrier, and receiving no PDCCH of which the DAI value is equal to M, the UE carries out mapping on the ACK / NACK feedback information of the downlink carrier by adopting a second class mode. According to the embodiment, when the UE loses the packets, the problem that the understanding of a base station is not consistent with the understanding of the UE for the ACK / NACK feedback information can be avoided, thus improving the reliability of the ACK / NACK transmission and the retransmission efficiency of a system.

A multi-antenna codebook selection modulation method for solving weak scattering is provided by the present invention. The method obtains higher diversity gain from a combination of multi-antenna codebook pre-coding and a rotation modulation solution by designing a new codebook selection rule. The present invention employs a design solution of designing a higher-order modulation diversity and space interleaver to obtain the higher diversity gain. In addition, the number of transmission antennas and the number of rotation modulation dimension can be set arbitrarily. However, the present invention takes the number Nt of transmission antennas to be equal to the number D of rotation modulation dimension in order to obtain higher diversity gain. In this way, the method evenly disperses signals of each dimension after D-dimensional rotation to each antenna through space interleaving technique, so that the signals of each dimension suffer different fading, thus enabling space diversity gain. With the present invention, the data of a transmitting end are pre-coded by using a channel value estimated for an ideal channel.

A method and apparatus are disclosed for reducing a transmission rate for retransmission of a current frame in a wireless communication system. The reduced transmission rate increases the probability that the current frame is correctly transmitted and acknowledged. The transmission rate is progressively reduced for the current frame to avoid the expiration of the frame's retry count, while not affecting the transmission rate of subsequent frames. The next frame should be transmitted at the highest rate permitted, by the signal quality. A disclosed retry count expiry avoidance algorithm increases the reliability of a retransmission by lowering the transmission rate for the current frame when an acknowledgement is not received. When an acknowledgement is not received, the transmitting station proceeds to a retransmitting state where the transmitting station first attempts to retransmit the frame at the same rate. When the number of “equal rate attempts” is exceeded, the retry count expiry avoidance algorithm enters to a fallback state, where the transmission rate is decreased in a progressive manner.

The invention discloses an optimal relay selecting method based on a power control technology in internet of vehicles. The optimal relay selecting method comprises the following steps of (1) calculating distances of a moving vehicle relative to neighbor nodes by obtaining current GPS position vector information of vehicles of all of neighbors; (2) respectively calculating transmitting power correspondingly required by reliable transmission of all of neighbor nodes based on a physical channel attenuation model; (3) calculating MAC layer transmission delay caused by all of transmitting power according to the 802.11p protocol; (4) synthesizing two indexes including the reliability and the delay of data transmission, calculating the priority level of each neighbor to be selected as a relay and selecting the neighbor with the highest priority level as an optimal relay for current information transmission. The optimal relay selecting method utilizes the characteristic that an adjustable range of transmitting power of a vehicle-mounted communication device is wide, various factors including physical channel attenuation, MAC layer message collision, retransmission delay and the like are comprehensively considered to select the optimal relay, messages in the internet of vehicles are reliably transmitted in real time in a large-range mode, and the application prospect is very broad.

The invention discloses a transmission method of D2D (device-to-device) communication links, a base station and a terminal. According to the transmission method, a HARQ processing mechanism is introduced to the transmission process of the data packets of the D2D communication links, so that the reliability of link transmission can be improved. The transmission method of D2D communication links provided by the invention includes the following steps that: the base station configures a hybrid automatic repeat request (HARQ) feedback resource pool for a first terminal and a second terminal which are connected into the base station, and D2D communication links are built between the first terminal and the second terminal; and the base station broadcasts the HARQ feedback resource pool to the first terminal and the first terminal.

The invention concerns a method for accessing a medium by a transmit node in a synchronous communications network comprising a plurality of nodes capable of accessing said medium during access time slots of predetermined duration to transmit data frames via said network. The plurality of nodes comprises a master node that implements a clocking that defines a network cycle for accessing said medium and comprises at least two slave nodes being slaves of said clocking including said transmit node. Each network cycle comprises a plurality of frames transmitted during said access time slots according to a predetermined transmission sequence.According to the invention, the transmit mode performs the following steps:receiving at least one frame coming from at least one of the other nodes of the network;from each frame received, obtaining synchronization information pertaining to a level of synchronization of the node having sent said frame, said level of synchronization being relative to the master node;selecting a reference node from the node(s) from which at least one frame has been received, as a function of said pieces of synchronization information;determining a start of access time slot from the positions in said transmission sequence of the frames associated with the reference node and with said slave node; andaccessing said medium at said determined start of access time slot.

The invention relates to a method for transmitting mass data based on a UDP protocol. The method comprises a sending method and a receiving method. As the data transmission of Ethernet is limited by packet size, the situation occurs that a data packet is unsuitable for transmission or even can not be transmitted occurs due to overlarge data size. The method for transmitting mass data based on the UDP protocol effectively combines a compaction algorithm and a data packet splitting method, sends mass data according to a principle of unpacking-compaction-unpacking and receives mass data according to a principle of uniting-decompaction-uniting. The sending end flow and the receiving end flow relate to a private protocol of a compaction / non-compaction data packet. The method has clear flow, concise parameters of a protocol format, strong extendibility and wide application range, can be effectively applied to transmitting mass data based on the UDP protocol and improve the efficiency and reliability of transmission.

The Universal Packet Loss Recovery System is capable of recovering end-to-end network packet losses to obtain reliable end-to-end network delivery of multimedia streaming content over Internet Protocol (IP) networks, where packet losses appear above the transport layer. This system incorporates the use of Packet Forward Error Correction Coding (FEC) with packet interleaving processing prior to transport. Packet FEC Coding is an error correction coding method at the packet level which improves link transmission reliability. At the source end of the packet-switching network, the Packet FEC Coding scheme encodes a stream of transport multimedia content packets by including redundant packets to allow for recovery of lost packets by the Packet FEC Coding decoder at the user end of the packet-switching network. Since lost packets appear only above the transport layer in the IP network protocol stack, Packet FEC Coding can be viewed as a transport layer or application layer coding method.

The present invention provides the method and system of a Time Division Multiplexing which makes use of a number of symbols in the time domain transmitting data sequence in parallel. The method includes: the transmitting terminal forms the transmission signals which are overlapped by a number of symbols in the time domain, and the receiving terminal does data sequence detection in the time domain for the received signals according to the one-to-one relationship between the transmission data sequence and the time waveform of the transmission data sequence. In addition, the present invention also provides a kind of Time Division Multiplexing system based on the above method of the Time Division Multiplexing. The present invention makes actively use of these overlapping to produce the coding constraint relation, thus the spectral efficiency of the system is improved by a large margin. In random time-varying channel, with reasonable arrangement, the transmission reliability of the system can also be improved at the same time, and at the same threshold, Signal Interference Ratio and its spectral efficiency are far higher than those of the high-dimension modulation and other technologies. At the same spectrum efficiency, the number of the total levels of its systems and the needed threshold Signal Interference Ratio are also reduced significantly than those of the high-dimension modulation and other technologies.

The invention discloses a fountain code-based multi-path parallel transmission method and apparatus. The method includes the following steps that: original data packets to be sent are cached respectively according to the address of a receiving end; whether the number of the original data packets in caching reaches a preset number or whether the waiting time of the original data packets in caching exceeds a preset value is judged; if the number of the original data packets in caching reaches the preset number or the waiting time of the original data packets in caching exceeds the preset value, fountain encoding is carried out on the original data packets in caching, so that encoded data packets can be obtained; the overall conditions of a plurality of tunnels for transmitting the encoded data packets are obtained, and the overall conditions of the plurality of tunnels are divided into a performance good condition and a performance poor condition, and corresponding transmission modes are selected according to the overall conditions, corresponding tunnels are selected for the encoded data packets according to the scale values of the encoded data packets under the corresponding transmission modes, and the transmission modes of the encoded data packets are adjusted correspondingly in different stages of the transmission process of the encoded data packets; and a feedback module is set at the receiving end, a sending end is made to judge whether the transmission process is completed, and therefore, multi-path parallel transmission of the original data packets can be realized, and link utilization rate and transmission reliability can be improved.

The invention discloses a method and a device for determining ACK (acknowledgement) / NACK (negative Acknowledgement) feedback bit number, and an indicating method and an indicating device for determining the ACK / NACK feedback bit number, which are used for enabling a UE (user equipment) to dynamically determine the ACK / NACK feedback bit number according to a configured downstream carrier, an activated downstream carrier or an indicated downstream carrier set, so as to improve the transmission reliability and transmission efficiency of the ACK / NACK information. The indicating method for determining the ACK / NACK feedback bit number comprises the following steps: a substation determines the indication information, wherein the indication information is used for indicating the UE to determine the mode of the ACK / NACK feedback bit number; and the substation sends the indication information to the UE through a physical downstream control communication channel (PDCCH).

A method and apparatus are provided for data transmission using a plurality of resources in a multiple antenna system. An m (m>1) number of bits from each encoded bit are mapped onto a resource to form a plurality of modulation symbols. With respect to said plurality of modulation symbols, spatial processing is performed according to a plurality of resources and a plurality of antennae to generate a plurality of transmission symbols. Each of said plurality of transmission symbols is transmitted via each of the corresponding multiple antennae.