141results about How to "Guaranteed transmission reliability" patented technology

The invention discloses a partition tree based multihop wireless self-organizing networking method, including the deterministic process for all partition root nodes, the interconnecting process between root nodes, the interconnecting route maintenance process between root nodes, the creation process for the partition tree, the dynamic maintenance process for the partition tree and the partition tree based routing process. Compared with the prior wireless network technology, the novel multihop wireless self-organizing networking method of the invention has the advantages of good expansibility, controllable network structure scale, little system overhead and high routing efficiency, thereby effectively improving network transmission efficiency and network performance.

The invention discloses a message pushing method, device and system. The method comprises the following steps that: a message queue server receives a subscription request sent through a proxy server, wherein the subscription request includes an identifier of the proxy server and target data information needing to be subscribed; the message queue server sends the subscription request to any pushing server; the pushing server receiving the subscription request acquires target data which are matched with the subscription request according to the subscription request; and the pushing server pushes the target data to the proxy server sending the subscription request according to the subscription request. Through adoption of the message pushing method, device and system, a distributed network can be extended rapidly; the data transmission reliability can be ensured; the throughput of pushed data is increased; and transmission delay of the pushed data is reduced effectively.

An Automatic Repeat reQuest (ARQ) method in a communication system having a protocol layer structure, in which a Layer 2 (L2) transmitter for generating an upper layer packet in a size suitable for transmission over a radio channel and transmitting the upper layer packet to a lower layer, transmits, to a receiver, polling information representative of an indicator for ordering the generation of a status report, and performs packet ARQ according to whether the status report is received within a predetermined time. The method includes determining whether there is a possibility that upper layer data contained in a packet data unit to be transmitted along with the polling information will cause an upper layer message in the opposite direction; and when there is a possibility that the upper layer data will cause an upper layer message, generating polling information ordering a receiver to wait for a predetermined time after receipt of a packet and to transmit an upper layer packet generated for the waiting time along with a status report, including the polling information in the packet data unit, and delivering the packet data unit to the lower layer.

The invention discloses an FPGA-based method for transmitting and confirming UDP real-time data from a point to multiple points, which comprises the following steps: (1) firstly, a real-time data collecting and controlling system, which is composed of a plurality of process-quantity collecting and controlling terminals, an FPGA-based communication controlling device and one or multiple upper-layer data processing devices, is established; (2) Secondly, a universal network interface card and a real-time operating system (RTOS) are configured in an industrial personal computer system so as to constitute the upper-layer data processing devices; (3) an ACK field is added into the header of application data of a UDP datagram which is from the communication controlling device to the upper-layer data processing devices; (4) after receiving the UDP datagram of the upper-layer data processing devices, the communication controlling device transmits and arbitrates the UDP datagram; and (5) after receiving the UDP datagram, the data processing devices check the self-related values in the ACK field; if the value is 1, then the current frame is confirmed, otherwise, the current frame is retransmitted after the timer overflow is sent.

The present invention relates to the technical field of cloud computing, RDMA, V2X, cooperative driving and automatic driving and particularly relates to a collaborative automatic driving system and method based on multi-channel RDMA and V2X. According to the system and the method, automatic driving related resources such as a vehicle end, a roadbed side unit, a pedestrian side and a cloud centerare connected through a V2X network, the power consumption and volume limitations of a vehicle body are fully considered, the memory is divided into areas, the efficient memory sharing is achieved, the requirements for computing and network resources is reduced, the interaction ability of all involved parties is enhanced, and the real-time response and processing ability is improved. Through roadbed side broadcast, the network and computing resources are saved. Data packets are sent alternately through multiple networks, the reliable transmission and real-time performance of key data are ensured, the safety of automatic driving is improved, and the efficiency of automatic driving is improved.

The invention provides an information transmission method and an information transmission device, belonging to the field of communication devices. The invention solves the problem in the prior art that the transmission real-time performance and the transmission reliability cannot be ensured at the same time. The method comprises the following steps: adopting an asynchronous communication method to transmit local real-time information to be transmitted; judging whether a receiver of the real-time information receives the real-time information or not; if so, stopping transmitting the real-time information; and if not, adopting the asynchronous communication method to continuously transmit the real-time information. The technical scheme provided by the invention can be applied to the information transmission field.

The invention discloses a method and an apparatus for transmitting host and backup mechanism data of a distributed file system. The method and the apparatus are used for solving the problem of an influence on business processing efficiency of a host metadata server in the prior art. The method comprises the steps that: a host metadata server establishes a connection with a backup metadata server after determining that the backup metadata server is started up; the host metadata server receives a data request sent by a client, determines a corresponding backup type according to the data request, performing data processing on data carried by the data request, and stores the processed data in a specified memory; and the data in the specified memory is sent to the backup metadata server according to the backup type. The data is asynchronously copied, so that the data operation efficiency of the host metadata server is improved on the basis of ensuring transmission reliability.

The invention discloses a method and an apparatus in grant free UE (User Equipment) and base station. The method comprises the following steps: determining, by a UE, a target resource pool according to at least one of {a first parameter and a second parameter}; and sending a first wireless signal on a target resource subpool, wherein the target resource pool is one of G candidate resource pools, the G is a positive integer greater than 1, the candidate resource pools include a positive integer of air interface resources, the target resource subpool belongs to the target resource pool, the target resource pool includes K air interface resources and the K is the positive integer, a first bit block is used for generating the first wireless signal, the numbers of the air interface resources included in any two candidate resource pools of the G candidate resource pools are not equal, the first parameter includes at least one of {a type of physical layer information and a business type}, thesecond parameter refers to a frequency that the first bit clock is sent until the first wireless signal, and one of the air interface resources includes a time frequency resource and a multiple access signature.

The invention discloses a data transmission method based on an IP Abis interface and a device, and the method comprises: a data transmission sending terminal of the IP Abis interface utilizes business payload data and control parameters to set up a business frame; a field containing business description information is added in the business frame, and the business frame is encapsulated in a real-time transmission protocol frame; the real-time transmission protocol frame is encapsulated in a network protocol frame, and is transmitted through an IP network; and a data transmission receiving terminal of the IP Abis interface analyses the real-time transmission protocol frame from received network protocol frame, analyses the business frame from the real-time transmission protocol frame, and then obtains the business payload data and the control parameters according to the analysis to the business frame. Through the use of the data transmission method, the invention can simplify the structure of the business frame, ensure transmission reliability and save network bandwidth resources.

The invention provides an information feedback method and apparatus, a terminal and an eNodeB and relate to the field of communication to solve a problem that the eNodeB cannot flexibly control the terminal to perform CSI feedback in the prior art. The method comprises the following steps: receiving a channel state information (CSI) feedback configuration group transmitted by the eNodeB; determining channel information required by the CSI feedback configuration group to be fed back by the terminal based on the channel information content indication information transmitted by the eNodeB; reporting the channel information required by the CSI feedback configuration group to be fed back by the terminal to the eNodeB. The scheme of the invention configures the CSI feedback configuration group for the terminal through the eNodeB to instruct the terminal to feed back the channel information according to the CSI feedback configuration group so that the eNodeB can flexibly control the CSI feedback of the terminal.

The invention discloses a radio frequency coaxial connector assembly suitable for blind matching and capable of allowing insertion offset. The radio frequency coaxial connector assembly comprises an escapement connector, an optical hole connector and an adaptor; the escapement connector comprises an escapement outer conductor, an escapement inner conductor and an escapement insulator; the adaptorcomprises a circular tubular adaptor outer conductor, an adaptor inner conductor and two adaptor insulators, wherein the two adaptor insulators are mounted in two end inner holes of the adaptor outerconductor respectively; each adaptor insulator is a hollow cylinder with an inner hole; a plurality of blind holes which extend in the axial direction are uniformly distributed in the cylinder body inthe circumferential direction of each adaptor insulator; the blind holes of the two adaptor insulators are arranged oppositely and positioned in the inner sides of the two end inner holes of the adaptor outer conductor; and the adaptor inner conductor is mounted in the inner holes of the two adaptor insulators. By virtue of the radio frequency coaxial connector assembly, the impedance in the connector interconnection interface part can be matched mutually, relatively high axial and radial offset is allowed, radio frequency electrical performance is improved, and signal transmission quality isimproved.

The invention discloses a service data transmission method, a base station and a terminal. The method comprises the following steps: determining numerical value configuration Numerology information oftarget service, the maximum transmission times of the service data of the target service and a redundancy version adopted in every transmission according to a transmission performance indicator of the target service; and within the maximum transmission times, sending the service data to the terminal through a transmission resource corresponding to the numerical value configuration information byadopting the redundancy version corresponding to every transmission. The base station disclosed by the invention determines the numerical value configuration information according to the transmissionperformance indicator of the generated service to ensure the delay requirements of the service transmission, and further determines the maximum transmission times and the redundancy version adopted in every transmission according to the transmission performance indicator of the generated service to ensure the transmission reliability of the service data. If the transmission performance indicatorsof the service are different, various parameters configured to the service are different so as to meet different reliability and delay requirements.

The invention discloses a method for recombining PPP multi-link protocol message in sequence, comprising: recombining and uploading PPP message which can be recombined and has MP fragment with expected serial number; if PPP message can not be recombined but has valid serial number, recording the valid serial number and setting a time threshold; if no valid serial number exists, ending processing the MP queue; when the time mark exceeds the time threshold, recombining and reporting all recombinable MP fragments between expected and valid serial numbers and discarding MP fragments unable to be recombined. And it can assure link transmission efficiency and reliability.

The embodiment of the invention provides a method and device for determining the number of OFDM symbols occupied by a control channel. The method includes the steps that if a PHICH is not adopted in a current subframe for transmission or the PHICH is adopted in the current subframe for transmission, the PHICH is in a common mode, and the scheduling user number of the current subframe is obtained; the number of CCEs is calculated; the number of OFDM symbols occupied by the control channel in the current subframe is determined according to the scheduling user number and the number of CCEs. In the method, full consideration is given to the practical scheduling user number and the environment of the control channel, system resources can be reasonably allocated, and system scheduling performance and throughput capacity are effectively improved.

The invention relates to the technical field of audio and video data transmission, and discloses a streaming media wireless adaptive transmission method based on a TCP (Transmission Control Protocol). According to the method, audio and video data is encapsulated through a fixed-length packet header by adopting the TCP according to the characteristic of reliable data transmission of the TCP; and meanwhile, double buffer areas are set to store and transmit audio and video data packets respectively, and packet loss and frame rate adjustment are performed according to the real-time state of a network to adapt to the bandwidth change of a wireless channel, so that a network congestion state is reduced. By using the principle, the original transmission reliability of the TCP is ensured, delay in video transmission is reduced, and high-quality transmission of the audio and video data based on a wireless network is well realized.

The invention provides a trusted improvement method of a router. Mainly targeting on the trust value carried by a ToS (type of service) field (IPv4) or a TC (traffic class) field (IPv6) in the header of an IP (Internet protocol) packet and the source of the IP packet, the method can carry out the dynamic adjustment on the trust value under the guidance of the trust strategy and lead the router to carry out the related operations of packet classification, enqueueing management, queue scheduling and packet loss regulation according to the trust value, so as to give the first priority for the guarantee of the transmission reliability and rate of more trusted IP pockets in the network and actively delay or drop the packets with lower trust value to confront the potential unsafe factors, such as network congestion and attack, thus making the entire network more trusted and safer.

The invention discloses an energy saving method and a dormancy decision making system for a wireless sensor network. In the method, a cellular automata (CA) state switching rule is designed, and a dormancy threshold value is set to adjust the dormancy intensity according to different network topology situations, so that a node can be switched between a dormancy state and a working state according to the CA state switching rule; and when excessive neighboring nodes are in the working state, the current node enters the dormancy state, thus the energy consumption is reduced. In the dormancy decision making system, a CA layer is designed between a medium access control (MAC) layer and an Internet protocol (IP) layer by rationally using a CA processing mechanism. According to the invention, on the basis of guaranteeing the reliability of network transmission, the energy consumption of the node is reduced and the life cycle of the network is prolonged.

The invention belongs to the technical field of communication, and relates to an adaptive modulation coding method based on double block error rates and a signal to noise ratio difference value. According to the adaptive modulation coding method provided by the invention, a current total PER, a segmented PER and an SNR difference value of the system are used as judgment reference, when the system meets reliable transmission conditions, the upper and lower thresholds of the segmented PER are adaptively adjusted according to channel conditions, thereby having the advantages of simple implementation, strong channel adaptability and good system transmission performance, the system spectrum efficiency can be further improved while ensuring the information transmission reliability, and it is conducive to the practical application of engineering.

The invention discloses a RTU data reliable transmission control method for a narrow-band asymmetric channel. The method comprises adopting the techniques of constant-value storage sending, time storage sending, automatic data supplement and delay waiting after completion of sending, and controls a sending rate by adjusting sizes of data packets, sending intervals and re-sending times. By using the method provided by the invention, key factors of successful data sending of a RTU is controlled in the case of bursting of messages, and control capacity of a RTU communication protocol is enhanced. On one hand, delay waiting parameters and maximal packet lengths of different channels are adjusted, and on the other hand, data which is unsuccessfully sent is supplemented. According to the method of the invention, reliability of the hypo-real-time data of the asymmetric low-speed channel is effectively improved.

The invention relates to the industrial wireless network technologies, and particularly to a packet aggregation method for a factory automation oriented TDMA (Time Division Multiple Access) wireless network. The packet aggregation method comprises the steps of: constructing various nodes of an industrial automation oriented networks into a star-shaped topological structure; allocating necessary time slots necessary for the communication to the nodes in the network by an AP (Access Point); packaging packets which need to be transmitted to multiple nodes into a packet according to an aggregation packet format by the AP based on the topological structure and the time slot allocation result if a buffer memory space is enough; judging if the node is a target node of the aggregation packet after the node receives the aggregation packet from the AP, if yes, receiving and disaggregating the packet, otherwise, discarding the packet; replying an ACK (Acknowledgement Character) response to the AP by the node which receives the aggregation packet, and retransmitting the aggregation packet to the nodes which send no ACK by the AP; and determining retransmission based on the ACK response by the AP. The packet aggregation method for the factory automation oriented TDMA wireless network reduces amount of the packets in the network and packet header expense, increases effective load of the packets, and optimizes performances of the factory automation oriented wireless network under the precondition of no data damage by fully utilizing the characteristic of short length of a acknowledgement frame in the factory automation application.