221 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 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 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 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.

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 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 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.

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 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 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.

A communication method and apparatus. The method comprises: sending first information to a terminal device, the first information instructing the terminal device to identify a data packet discarded when no network congestion occurs; sending data packets to the terminal device; and receiving first packet loss information from the terminal device, wherein the first packet loss information comprises packet loss information when no network congestion occurs, and / or packet loss information when network congestion occurs. Thus, an application server can know packet loss when no network congestion occurs, and / or packet loss when network congestion occurs, and the impact of packet loss of base stations on media services can be more accurately obtained.

The invention relates to a vulnerability mining method and device for an intelligent unmanned system controller program. The method comprises the following steps: acquiring a communication data packet corresponding to the intelligent unmanned system sent by a fuzzy tester through a target test program; synchronously running a test driving thread and a target data packet receiving thread of a communication data packet corresponding to the intelligent unmanned system through the target test program based on a blocked communication mode; receiving a communication data packet corresponding to the intelligent unmanned system based on a target data packet receiving thread through a target test program, analyzing the communication data packet corresponding to the intelligent unmanned system, and determining execution data; and running the synchronous sending program and the synchronous receiving program, enabling a target execution thread in the target test program and the target data packet receiving thread to run synchronously, running execution data based on the target execution thread, and obtaining a vulnerability mining result of the intelligent unmanned system controller program. According to the scheme, the execution stability of the coverage rate guide fuzzy test process can be improved.

The invention belongs to the technical field of Internet of Vehicles control, and particularly discloses a resource allocation method and system of a cellular Internet of Vehicles based on graph reinforcement learning. The method comprises the following steps: firstly, establishing a two-dimensional Markov chain model, and describing a resource allocation and data packet transmission process in a CAM and DENM coexistence scene; then providing a data packet reception ratio model used for evaluating the successful reception probability of CAM and DENM data packets; meanwhile, a time delay model is provided for describing the time interval between two continuous CAM data packets or DENM data packets successfully received by the same vehicle. On this basis, a multi-agent deep reinforcement learning framework is established to realize intelligent resource selection decision of the vehicle, and a resource allocation method based on graph reinforcement learning is further provided to guide the agents to more effectively extract spatial topological features of vehicle nodes, so that the resource allocation efficiency is improved. According to the invention, based on the extracted features, the optimal resource allocation decision can be learned and acquired for each vehicle, the successful reception rate of data packets of CAM and DENM is improved, and the time delay is reduced.

The application discloses a kind of mobile equipment online examination methods, comprising: the behavior information of triggering at least two events in first event, second event, third event;According to two behavior information, output warning information;Examination program triggers pause event, and examination program is switched to background suspension operation;Heartbeat packet is sent to server;According to whether success of heartbeat packet reception, determine the data submission state of examination program;The data indicated by the input operation of user is sent to server and is stored in local answer database with encryption;When current examination program state is submission failure, supplement in local answer database is identified;Login current examination program, and the data in local answer database is uploaded according to version number.The application not only realizes full coverage monitoring to online examination cheating behavior, but also improves recovery success rate in abnormal submission scene.The application also discloses a system, electronic equipment and storage medium for implementing the above method.

The application relates to a cryptocurrency auxiliary supervision method based on keyword traffic identification, and belongs to the technical field of blockchain supervision. The application combines data information of a blockchain network and a communication function of a network node, first collects traffic data, extracts keyword features in the traffic data according to a communication protocol, matches specific fields with categories of cryptocurrencies, and obtains a preliminary judgment result of categories corresponding to the traffic. Then, simulated data packets are created according to a communication protocol of a target cryptocurrency in the preliminary judgment, a connection is established with a target node, the data packets are sent, returned data packets are received and parsed, and key information in the returned data packets is analyzed to verify the judgment result and determine the type of the target node. The node and information thereof are stored in a database in a labeled manner, and the node label is continuously monitored and regularly updated. The application realizes efficient identification of cryptocurrency traffic, and enhances the supervision efficiency of a supervision platform on cryptocurrencies.

A method of controlling a receiver of radio frequency communications includes intervals between the reception of a data packet header and an acknowledgement sent by the receiver being constant, and, once a packet has been correctly received, circuits of the receiver are put into standby for a duration corresponding to the interval after each reception of a header of same rank as that of the correctly received packet.

The application belongs to the technical field of Internet of Vehicles control, and specifically discloses a resource allocation method and system for cellular Internet of Vehicles based on graph reinforcement learning. First, a two-dimensional Markov chain model is established to describe the resource allocation and data packet transmission process in the coexistence scenario of CAM and DENM. Then, a data packet reception ratio model is proposed to evaluate the successful reception probability of CAM and DENM data packets. Meanwhile, a delay model is proposed to depict the time interval between the successful reception of two consecutive CAM data packets or DENM data packets of the same vehicle. On this basis, a multi-agent deep reinforcement learning framework is established to realize intelligent resource selection decision of vehicles. Furthermore, a resource allocation method based on graph reinforcement learning is proposed to guide the agents to more effectively extract the spatial topological features of vehicle nodes. Based on the extracted features, the application can learn and obtain the optimal resource allocation decision for each vehicle, thereby improving the successful reception rate of CAM and DENM data packets and reducing the delay.

Embodiments of the present application disclose a method, apparatus, electronic device, and computer-readable storage medium for receiving data packets, relating to the field of computer network technology. The method includes: obtaining data packet reception status parameters in real time; dynamically adjusting the data packet reception configuration based on the data packet reception status parameters; and receiving and processing the data packet according to the adjusted data packet reception configuration. In this manner, this solution can dynamically adjust the data packet reception configuration.

This time synchronization device comprises: an internal clock and a slave clock; a frequency synchronization unit that synchronizes the frequency of the internal clock with the frequency of the clock of a time master apparatus; a calculation unit that calculates a downlink delay time, which is the time difference between a packet transmission time from the time master apparatus and a packet reception time stamped by the internal clock, and an uplink delay time, which is the time difference between a packet transmission time stamped by the internal clock and a packet reception time at the time master apparatus; a prediction unit that predicts the shortest downlink delay time on the basis of the calculated downlink delay time and predicts the shortest uplink delay time on the basis of the calculated uplink delay time; and a time synchronization unit that synchronizes the time of the slave clock with the time of the clock of the time master apparatus on the basis of the predicted shortest downlink delay time and the predicted shortest uplink delay time.

This invention provides an energy efficiency optimization method for the large-scale deployment of ultra-reliable low-latency (URLLC) devices, comprising: Step 1: Calculating the short packet collision probability and short packet reception failure probability of a single device, and calculating the packet loss rate of the device based on the calculated short packet collision probability and short packet reception failure probability; Step 2: Calculating the packet loss rate of each device, and grouping devices with similar communication environments into one category based on the calculated packet loss rate; Step 3: Optimizing the energy efficiency of all devices categorized in Step 2 using a deep reinforcement learning method. The beneficial effects of this invention are: 1. The method can effectively reduce the transmission power of sensing devices sending short packets and the number of times the same short packets are repeatedly sent, significantly improving the communication energy efficiency of URLLC devices and extending their battery life; 2. The method of this invention uses a classification method, which significantly shortens the training time of deep reinforcement learning.

The embodiment of the invention provides a protocol implementation protection method and device in a grey box scene and a medium, and belongs to the technical field of data processing, and the method specifically comprises the steps: obtaining a data packet sent by a client, and sending the data packet to a request data packet receiving module; judging whether the structure of the data packet is legal; judging whether the deep logic of the data packet is legal or not; forwarding the data packet to a server through a request data packet forwarding module; the server performs service processing after receiving the data packet, and realizes that an internal state information collection module collects internal information of the server through a protocol; judging whether the server side is abnormal or not according to the internal information, if yes, learning a condition triggered by the abnormity through an abnormity learning module, and replying an error information packet to the client side through an abnormity notification module according to the abnormity information of the session, and if not, returning the abnormal information of the session to the client side. And if so, the server sends the response packet to the response data packet forwarding module and forwards the response packet to the client. Through the scheme disclosed by the invention, the safety and the adaptability are improved.

The invention provides a reliable multi-link transmission method for resisting cascade degradation of a scheduling system, which comprises the following steps: a sender updates link state information based on a data packet arrival event, and implements a degradation strategy on available links based on the updated link state information, so as to determine a degraded link in the available links; the data packet to be sent is sent through the remaining undegraded links in the available links; and the receiver receives the to-be-sent data packet and evaluates whether the current scheduling mode satisfies a preset condition based on the to-be-sent data packet, if not, a notification data packet is sent to the sender, and the sender selects a proper link to be promoted to a scheduling state based on the notification data packet and a promotion strategy. According to the method and the device, the transmission performance caused by link deterioration can be greatly reduced, the problem of transmission state division error caused by environment burst interference can be avoided, and the accuracy of link state evaluation can be improved.

This application provides a communication method and a communication apparatus. The method includes: a terminal device receives a data packet of a first service from a network device; and when a transmission mode of the first service changes, the terminal device sends data packet receiving status feedback information to the network device. The terminal device feeds back a receiving status of the data packet in time, so that the network device can dynamically switch the transmission mode of the first service based on the feedback information of the terminal device, or can retransmit the data packet in time when a packet loss occurs after the switching. This improves reliability of transmitting first service data.

The invention discloses a method and a system for realizing a pause frame in a data retransmission process, and the method comprises the steps: a receiving end receives a current data packet and judges whether the current data packet is a correct data packet or not in a link layer transmission process; when the receiving end judges that the current data packet is a wrong data packet, the receiving end discards the current data packet and subsequent data packets and sends an NACK request to the sending end; after the sending end receives the NACK request, on one hand, the buffer space is released, and on the other hand, data retransmission is carried out according to the NACK request; wherein the retransmitted data volume is all data packets which are not released in the buffer space; and the sending end feeds back to the upstream of the sending end when judging that the data volume of the data packet which is not released in the buffer space is greater than a preset maximum value, so that the upstream stops sending a new data packet to realize a frame pause function. According to the invention, it can be ensured that the retransmitted data packets in the buffer space can be received by the receiving end, multiple retransmission of data is effectively avoided, and controllable data retransmission is realized.

An example mobile computing device includes a wireless communication interface configured to connect to a network deployed by a plurality of base stations; a controller for a wireless communication interface, the controller configured to: initiate a scan of an external base station; when the scanning is completed, returning to the local base station and initiating local channel residence time; receiving a data packet from the local base station during the local channel residence time; receiving an indicator indicating that the transmission of the cached data packets from the local base station has been completed; and terminating the local channel residence time in response to the indicator.