354 results about "Packet reception" patented technology

The invention discloses a power system source network interaction data security encryption verification method, system, device and medium, and belongs to the technical field of power system communication encryption, and the method comprises the following steps: a source side device and a network side device complete identity authentication through a bidirectional digital certificate verification mechanism; and an identity binding label is generated in combination with the device identifier, the timestamp and the position information. And after the authentication is passed, the two parties perform key negotiation based on an elliptic curve algorithm, and generate a temporary encryption key in combination with an authentication result. A source side device carries out structural packaging on original interaction data, adds a random number, a timestamp and a hash abstract, then encrypts the original interaction data in an AES-GCM mode, and carries out signature binding on key fields through digital signatures to form a complete data packet. And a receiving end performs compliance judgment on the timestamp and the random number in the data packet, and after the timestamp and the random number are confirmed to be in an effective time window and are not replayed, signature verification, decryption processing and Hash consistency verification are sequentially completed, so that closed-loop processing of a data flow is ensured.

The invention provides a TCP / UDP (Transmission Control Protocol / User Datagram Protocol) collaboration-based video stream low-delay transmission and real-time decoding rendering method. The method comprises the following steps of: carrying out connection management and signaling interaction; the sending end captures data for coding, and dynamically captures screen content; synchronizing the collected multi-source data according to a timestamp, transmitting the data to an encoder, and preprocessing the data before transmission; a packaged data packet is sent according to a designed transmission protocol, after receiving the data packet, a receiving end analyzes and restores the data packet according to the protocol to obtain data format information, creates and initializes decoder parameters, and then sends a prompt that preparatory work is ready to wait for receiving video stream data to a sending end; video stream data in the data transmission process are transmitted through a TCP, and in the process of rendering and displaying frame data after the video stream data are received by a receiving end, hardware acceleration is performed by using an OpenGL and utilizing a GPU, and decoded frames are displayed on a screen in real time. The method has the advantages of low delay, high reliability, high rendering efficiency, cross-platform compatibility and the like.

The invention discloses an edge computing-based industrial Internet of Things equipment data encryption transmission method, which comprises the following steps of: constructing an edge node alliance comprising at least two cross-regional edge gateways, completing bidirectional identity authentication through an alliance root certificate, and establishing an encrypted communication link; industrial equipment collects original data and then transmits the original data to an edge gateway which the industrial equipment belongs to, and the gateway extracts data features and divides the data features into a core control level, a process parameter level, a common monitoring level and a security level; differential encryption strategies are adopted for different levels of data; each edge gateway uploads the encrypted data to a distributed key management node, and obtains and synchronizes a periodically updated key chain; during cross-region transmission, performing secondary packaging and encryption to generate a data packet containing identifications such as a security level and the like; and the receiving end verifies the legality of the node, decrypts and verifies the integrity of the data, distributes the data if the decryption is passed, and blocks the alarm if the decryption The method is suitable for scenes such as single-area monitoring and multi-area manufacturing, data security and transmission efficiency balance are achieved, and all-weather stable transmission is guaranteed.

The present disclosure provides a smart fire blanket device for detecting a thermal event of a vehicle. The smart fire blanket device can include a blanket and a detection module. The detection module can be coupled to the blanket and can include a sensor packet, a controller, a light source, an audio source, and a power source. The sensor packet can include a sensor for detecting the thermal event. The sensor can be adapted to monitor the thermal event associated with the vehicle and can detect heat, heat vented rise, humidity, pressure, and / or tilt of the vehicle. The controller can be in communication with the sensor packet and can be configured to receive and process data from the sensor packet. The light source can provide a visual alert. The audio source can provide an audio alert.

The invention discloses a packet loss error correction method and system based on a sliding window, and belongs to the field of packet loss error correction, and the method comprises the steps: setting an original data packet number N, a redundant data packet number M, FEC coding time and FEC decoding time, and determining a preliminary window size according to the FEC coding and decoding time, a packet loss rate, a code rate and jitter rate information; carrying out redundancy coding on the data packets by adopting forward error correction codes, and sequentially sending N + M data packets by a sending end based on a sliding window; the receiving end maintains a receiving window, stores the received data packet, and performs error correction by using the redundant packet; detecting the lost data packet by adopting an acknowledgement mechanism, and if the ACK or the NACK is not received in the Ttimeout, retransmitting the lost data packet by the transmitting end; and dynamically adjusting the window size according to the packet loss rate. According to the method, the window size and the FEC redundancy ratio are dynamically adjusted according to the network packet loss rate, adaptive adjustment is achieved in different network environments, bandwidth waste is reduced, higher error correction capacity is provided in a high packet loss environment, and data transmission efficiency is improved.

The invention discloses a distributed traffic mirror image acquisition method based on an OVS flow table and a VXLAN protocol, and the method comprises the following steps: S1, initializing a working environment, and configuring an OVS service; s2, creating a virtual machine and acquiring network bridge information of the virtual machine; s3, binding the VXLAN tunnel interface to a network bridge of the virtual machine; s4, adding a flow table rule in the network bridge to realize flow matching and mirror image output; s5, the rules are dynamically adjusted through an adaptive flow table optimization algorithm, and the flow processing efficiency is improved; s6, detecting and removing repeated data packets by using an in-segment data deduplication algorithm; s7, receiving the mirror image data and carrying out traffic summarization and classification processing; and S8, completing distributed flow collection, and obtaining high-quality flow data for analysis and processing. According to the method, additional services are not needed, the deployment process is simplified, the flow collection efficiency and the data integrity are improved through dynamic adjustment and de-duplication optimization, and the method is suitable for network flow management and analysis of a large-scale cloud computing environment.

The invention discloses a data transmission method. The method is applied to a sending device of a first data center and a receiving device of a second data center. And the sending device obtains the data transmission configuration information. The data transmission configuration information comprises a network address of the receiving equipment and address information of the data to be transmitted. And the sending device reads the to-be-transmitted data from the data disk based on the address information, and sends a first data packet to the receiving device based on the network address of the receiving device. And the receiving equipment acquires the first data packet and stores the first data included in the first data packet into a data disk of the receiving equipment. Thus, the sending device reads the to-be-transmitted data based on the data disk, a data storage mode of a bottom layer can be shielded, the number of times of reading the to-be-transmitted data from the data disk is reduced, the time expenditure of data reading is reduced, and the efficiency of data transmission between data centers is improved. In addition, the invention also provides a corresponding device and related equipment.

The invention provides a method and a system for improving the performance of a wireless Mesh network, and relates to the field of intelligent control of the wireless Mesh network, the method comprises the following steps: establishing a device end state reporting mechanism, setting a random delay time when the device state changes, and reporting the device state after the random delay; performing congestion detection according to the reporting result of the equipment state, monitoring the number of data packets received in the Mesh network in real time, counting the number of data packets received per second, and comparing the number with a set threshold value to judge whether the network is congested or not; congestion processing is carried out according to the congestion result, when the network congestion is detected, reporting of the equipment state is further delayed, the additional time of delay is dynamically adjusted according to the actual network condition, and the network congestion is relieved. According to the invention, through comprehensive application of an equipment end state reporting mechanism, air packet congestion detection and processing and an instruction priority mechanism, the problem of network congestion is effectively relieved, the stability of the system and the real-time performance of control are ensured, and the user experience is improved.

The invention belongs to the technical field of medical equipment and medical signal processing, and relates to a non-invasive blood glucose dynamic detection system which is mainly composed of a terminal subsystem and an upper computer subsystem. The terminal subsystem comprises a system control and information processing module, a signal acquisition module, a data transmission module and a power management module; the upper computer subsystem comprises a data packet receiving and analyzing module, a data storage and management module, a data processing module, a deep learning training module and a reasoning estimation module. Wherein the system control and information processing module manages a multi-signal acquisition task by introducing a real-time operating system, ensures the real-time performance of acquisition, packs the acquired signals into a data packet, and sends the data packet to the upper computer subsystem through the data transmission module. In the upper computer subsystem, a user can carry out self-defined training according to the stored data so as to obtain a detection model used for estimating the blood glucose value.

The invention discloses a LoRa-based parallel backscatter communication method and system. The method comprises the following steps: transmitting a single-tone radio frequency source signal as a signal excitation source; designing a backscattering label, and performing backscattering modulation processing on the environmental perception data in combination with the signal excitation source to obtain a modulated standard LoRa data packet; and the receiver presets the center frequency of a communication link, and performs frequency band distinguishing and demodulation processing on the modulated standard LoRa data packet to complete parallel backscatter communication of the LoRa data. According to the invention, while a parallel backscattering LoRa communication system compatible with commercial LoRa equipment is realized, the throughput of the system is improved, and frequency division multiple access parallel transmission is realized. The LoRa-based parallel backscatter communication method and system can be widely applied to the technical field of parallel backscatter communication.

The invention provides an audio and video synchronization method and device, computer equipment and a storage medium so as to improve user experience in a complex network environment. Firstly, audio and video data packets are received and cached in a playing buffer area; calculating data packet receiving time through an adaptive filtering algorithm to obtain basic delay evaluation data; and the particle filter identifies network fluctuation and delay jitter data to obtain real-time network state evaluation data. Based on these data, the system determines overall delay assessment data for historical periods of time to more accurately predict and adjust synchronization; the system dynamically adjusts the size of a playing buffer area and the cache amount of data packets, and ensures that enough cache data exist in audio and video synchronous processing. And finally, performing synchronization processing on the data packets in the playing buffer area to obtain and play target audio and video data. Generally speaking, the scheme effectively deals with network changes, reduces audio and video asynchronization and improves user experience by dynamically adjusting the size of the buffer area and the buffer amount.

The invention relates to a data packet receiving method, a data processing unit, a host and a network card, and the method comprises the steps: when a data packet needs to be received, the host prepares an idle cache unit and generates a first cache descriptor, when the data processing unit receives the data packet (a small network packet), the data packet is written into a local cache unit according to a cache line alignment principle to form an aggregated data packet, and the aggregated data packet is sent to the host; the aggregated data packet is written into a host side cache unit according to the first cache descriptor, a completion descriptor is sent to a host, and the host can analyze the aggregated data packet according to the content of the completion descriptor to obtain each network packet. According to the method and the device, a plurality of small network packets are aggregated into a relatively large aggregated data packet, so that on the basis of being compatible with the existing Virtio protocol, PCIe write-in times are reduced, the bandwidth utilization rate is improved, occupation of a cache unit is reduced, and the resource utilization rate is improved.

The invention discloses a data transmission method and computer equipment, and relates to the technical field of data transmission. The method comprises the following steps: acquiring a sending work request containing a local sending queue pair number and a work queue element; querying target sending information by taking a local sending queue number as an index; storing the working queue elements and the target sending information as operation contexts into an internal memory of a network card of a request end, and recording corresponding indexes; assembling a target data packet based on the target sending information and the memory index; receiving a feedback data packet of the target data packet and extracting a memory index and a serial number carried by the feedback data packet; if the feedback data packet is a correct confirmation data packet, judging that the sending of the work request is completed and releasing the context; and if the feedback data packet is a confirmation failure data packet, calculating a retransmission data initial address and organizing retransmission. The technical problem that the effective connection number of network cards is limited by hardware resources in the prior art is solved, and the technical effect of supporting large-scale network parallel communication is achieved.

Examples described herein relate to an interface that is to receive data for transmission and based on indication of failure of receipt of one or more packets that carry segments of the data, cause re-transmission of solely one or more of the multiple packets that comprise a segment of the data referenced by the indication of failure of receipt of one or more packets. In some examples, the interface is to encrypt the data using an encryption engine and to segment the data for transmission using one or more packets. In some examples, the interface is to receive the data and an indication of which segment of the data to re-transmit; encrypt the data; segment the encrypted data into one or more packets; and based on the indication of which segment of the data to re-transmit, transmit solely one or more of the multiple packets that comprise a segment of the data referenced by the indication of failure of receipt of one or more packets.

The embodiment of the invention provides a communication method and device. The method may be performed by a base station. The method comprises the following steps: receiving a first acknowledgement from terminal equipment, wherein the first acknowledgement is used for indicating that an activation signaling of a secondary cell is correctly received; sending a detection data packet to the terminal device; receiving a second acknowledgement from the terminal device, the second acknowledgement being an acknowledgement of the detection data packet, the second acknowledgement being used for indicating that data transmission is ready; and sending the data to the terminal equipment. According to the method, after receiving the acknowledgement of the activation signaling, the base station actively detects whether the terminal equipment is ready for data transmission, and if the terminal equipment is ready for data transmission, the two parties can execute data transmission, so that the data transmission time is advanced, the waiting time is saved, the data transmission efficiency is improved, and the user experience is improved. And the communication time delay is reduced. According to the method, the communication flexibility is also improved, and the user experience can also be improved.

The invention provides an optimized kernel network and an implementation method thereof, and relates to the technical field of kernel networks, the kernel network comprises a fast data channel component XDP arranged on a data link layer; when the network card equipment receives a message data packet, the XDP analyzes and filters the received data packet, or encapsulates or de-encapsulates the received data packet, and modifies a field to forward the data packet; and the XDP matches and filters the received data packet with the rules in the BPF Maps, and discards the data packet when the data packet is illegal. The method comprises the steps that hardware initialization comprises the step of adding a zero copy processing flow when an NAPI polling point processing function is added; the application program configures an XDP socket; the xsk unit executes a BPF instruction, calls a network card driving unit to configure an XSK cache pool, and establishes a DMA mapping relationship between the device and the UMEM shared cache; and the network card drives zero-copy receiving and receiving of the data packet. According to the invention, the kernel network communication efficiency is improved.

A wireless communication device includes a communication unit and a control circuit for controlling the communication unit. The control circuit sets, in the communication unit, a different advertising identifier for each application. The communication unit repeatedly transmits an advertising packet that corresponds to the set advertising identifier and does not include the advertising identifier, receives a connection request for wireless communication transmitted from a first wireless communication device that is one of the other wireless communication devices that have received the advertising packet, terminates transmission of the advertising packet transmitted immediately before the connection request is received, and wirelessly connects to the first wireless communication device. The control circuit determines whether the wirelessly connected first wireless communication device is a connection destination expected by a first advertising identifier being the advertising identifier corresponding to the advertising packet whose transmission is terminated.

The invention belongs to the field of LPWAN Internet of Things, discloses a LoRa network adaptive data rate control method and system, and aims to reduce unnecessary energy consumption and prolong the service life of terminal equipment, especially equipment depending on battery power supply, by optimizing the transmitting power and the data rate. By dynamically adjusting the data rate, the terminal can still keep communication under the condition of weak signals, and the overall network coverage range and the signal quality are improved. According to the method, the communication parameters in the link state are optimized, the data packet receiving rate can be improved, and the reliability of data transmission and the stability of the link are ensured. According to the invention, the number of terminals using different data rates in the network can be adaptively adjusted, the network throughput is increased, the transmission efficiency is improved, and good communication quality is maintained.

The invention discloses an adaptive modulation coding method and system based on fuzzy logic, and belongs to the field of wireless communication, and the system comprises a dynamic window module which dynamically adjusts the window size of a fuzzy set according to the received signal strength indication and the change trend of the packet reception rate; the input fuzzification module takes the actual received signal strength indication and the packet reception rate as input and converts the actual received signal strength indication and the packet reception rate into fuzzy variables through fuzzification processing; the fuzzy reasoning module is used for defining different membership functions, mapping continuous received signal strength indications and packet reception rate measurement values into a fuzzy set, considering membership value combinations of all RSSI and PRR fuzzy categories, calculating a weighted total score and outputting a fuzzy decision value; and the defuzzification module is used for converting into an actual modulation coding selection scheme through a defuzzification process. By adopting the method and the system, the adaptability and the response speed of the system to complex and changeable channel conditions are improved, and the accuracy and the reliability of adaptive modulation coding selection are improved.

The invention belongs to the technical field of Internet of Vehicles control, and discloses an Internet of Vehicles channel congestion distributed closed-loop control method. According to the method, a closed-loop feedback channel resource congestion control strategy is provided, and a closed-loop feedback control framework adopted by the strategy is composed of reference model construction and adaptive feedback control model construction. And constructing a data packet acceptance rate model and a network effect maximization model in the reference model, and solving an optimal data packet reception probability as an ideal state of the Internet of Vehicles. In the adaptive closed-loop feedback control model, an error between an ideal state and an actual network state of the Internet of Vehicles is adjusted through a PI controller, so that the actual network state infinitely approaches the ideal network state. Network parameters are dynamically adjusted based on model reference adaptive control, the reliability of communication between vehicles in a dynamic network environment is ensured, and expected stability and robustness of a system can be kept in a dynamically changing environment.

The invention relates to a PCIE interface performance test system. The system comprises a to-be-tested mainboard, the to-be-tested mainboard comprises a PCIE interface, and the to-be-tested mainboard is used for writing each first PCIE data packet into PCIE equipment through the PCIE interface and recording a data writing start timestamp; after each first PCIE data packet is successfully written, recording a data writing ending timestamp; generating a write performance test result of the PCIE interface based on the write start timestamp, the write end timestamp and the total size of each first PCIE data packet; and the PCIE equipment is used for receiving each first PCIE data packet, and after each first PCIE data packet is successfully received, the first PCIE data packet is discarded. By adopting the method, the test requirement of the theoretical bandwidth of the PCIE interface can be met.

The invention discloses a satellite-borne equipment embedded system software on-orbit reconstruction method and a satellite-borne equipment embedded system. The method comprises the following steps: partitioning a FLASH memory of a microcontroller of satellite-borne equipment into a region, a BootLoader boot program region and an application program storage region; an independent BootLoader bootstrap program is solidified in the BootLoader bootstrap program area in advance; receiving a program file subpackage from a satellite service computer during on-orbit operation; a two-stage reliable transmission protocol including sequential receiving and packet supplementing receiving is adopted to receive a program file, wrong and missing packets are received and dynamically recorded in the sequential receiving stage, and only the wrong and missing packets are selectively retransmitted in the packet supplementing receiving stage; according to an instruction of the satellite service computer, the received complete program file is verified, the program file is written into the application program storage area after passing the verification, updating is completed, the BootLoader bootstrap program jumps to the updated application program, and on-orbit reconstruction is completed.

The present application relates to a control method and apparatus for an LED display screen control system, a computer device, a storage medium, and a computer program product. The method comprises: a Ubuntu system acquires information of each node on the basis of a network topological graph, and then generates control information on the basis of the information of each node and control data (S302); the Ubuntu system transmits the control information to a transmitting card in the network topological graph (S304); the Ubuntu system transmits the control information and a time node to a workstation in the network topological graph (S306); at the time node, the transmitting card transmits a control data frame from a first port of the transmitting card to a receiving card in a receiving card string (S308); on the basis of the control information, the Ubuntu system alternately controls the workstation and the transmitting card to transmit an image data packet to the receiving card at the time node (S310); and on the basis of the image data packet, the receiving card controls an LED display screen to display an image (S312).

A topology information update method includes a first node that sends a first packet in a broadcast manner, receives a second packet from a second node, where the second packet is a broadcast packet, and the first packet and the second packet each carry an identity identifier, a topology identifier, and a synchronization radius identifier that are of the respective node. The first node determines, based on the first packet and the second packet, whether the first node and the second node need to synchronize topology information.

The invention discloses a selective retransmission function test method, device and system for remote direct memory access, a medium and a product, and relates to the technical field of network tests.The method comprises the steps that when message features of a received test message are successfully matched with a packet loss rule, redirection processing is carried out on the test message so as to achieve controllable discarding, and the message features of the test message are successfully matched with the packet loss rule; according to the method and the device, the selective retransmission function is triggered, and the release rule corresponding to the test message takes effect to ensure that the subsequent corresponding retransmission message can be normally forwarded, so that only the first transmission of the original message is intercepted, the retransmission message is released, and the purpose of controllable packet loss is achieved; and finally, the selective retransmission function is evaluated according to the redirected message information in the function test process and the message receiving information of the message receiving end, so that the technical problems that the test packet loss is uncontrollable and the accurate test requirement is difficult to meet in the related technology can be solved, and the test efficiency is improved. The technical effects of accurate and controllable verification and performance evaluation of the selective retransmission function are achieved.

The invention provides an orthopedic surgery robot remote surgery control method, system and device and a computer readable storage medium. The method comprises the following steps: a local master control end receives a feedback data packet sent by a remote master control end through a wireless communication network, and records a data packet receiving timestamp and a data packet receiving duration; calculating a data packet transmission delay duration according to the data packet sending timestamp and the data packet receiving timestamp; if the data packet transmission delay duration is less than the data packet receiving duration, the local master control terminal dynamically allocates processor nodes with idle resources to receive and process the data packet; and in response to the operation of the local user, the local master control terminal sends a control instruction to the remote master control terminal through the wireless communication network so as to control the orthopedic surgery robot to perform surgery. According to the embodiment of the invention, the orthopedic surgical robot can be remotely controlled with lower delay.

The invention provides a time synchronization method executed by slave equipment, and the method comprises the steps: receiving a time synchronization packet from master equipment, and obtaining the packet transmitting time of the master equipment and the packet receiving time of the slave equipment; calculating a clock offset value between the slave device and the master device based on the packet transmitting time of the master device, the packet receiving time of the slave device and the path delay calibration value, and correcting a local clock of the slave device; wherein the path time delay calibration value is related to the distance between the master device and the slave device. The method can correct the clock skew between the master device and the slave device in real time, and improves the time synchronization precision.

The embodiment of the invention provides a domain name resolution path determination method and device, equipment, a storage medium and a product. The method comprises the following steps: acquiring an internet protocol address IP of a target server; generating a prefix part of the second-level domain name according to the IP address of the target server; splicing the prefix part with the secondary domain name to determine a detection domain name of the target server; controlling the client to send an analysis request for the detection domain name to a target server, so that the target server sends a request data packet to an authoritative server; receiving all request data packets sent by the authoritative server, and screening all request data packets according to the detection domain name to obtain a first target data packet; judging whether a source address in the first target data packet is consistent with a target server IP; and if the source address is consistent with the IP of the target server, determining that the analysis path is composed of the client, the target server and the authoritative server. The method is used for achieving the effect of comprehensively restoring the recursive analysis path.

The present application belongs to the technical field of communications. Disclosed are a communication method and apparatus, and a terminal, a network-side device and a medium. The communication method in the embodiments of the present application comprises: before a first data packet related to a call service is sent, when a first condition is met, a terminal sending a second data packet, wherein the first condition comprises at least one of the following: completing the establishment of a first bearer, which is used for transmitting the first data packet, having received an SDP answer message, completing the sending of the SDP answer message, or the terminal having accessed a network by means of a satellite.

According to the shared cache recovery system provided by the invention, through structures of an information storage unit and a linked list pointer, idle linked lists and data linked lists have a unified linked list structure framework, all cache units and attached information units are homogeneous in structure, and all the cache units and the attached information units are organized in different logic linked lists only through the linked list pointer. When the port receiving module receives and caches data packets and the port sending module sends the data packets, the data packets can be recovered only by performing dynamic conversion through linked list pointer operation, so that the system does not need two cache management units with different logics or structures due to maintenance of'idle 'and'data'. The system resource occupation is obviously reduced, the resource idle waste is avoided, and the data structure management and recovery process is simplified.