271 results about "Data link layer" patented technology

The invention discloses a power line carrier communication protocol data link layer simulation method, which comprises the following steps of: constructing a physical layer interface simulation module, simulating power line carrier or wireless air interface transmission through TCP socket communication, and creating a high-priority task process to process time slot-level time sequence synchronization for triggering a physical layer transceiving action at a specified time slot; configuring a time sequence synchronization control mechanism, obtaining a timestamp carried by a beacon frame sent by a concentrator, calling a clock synchronization function to align a site local clock with the timestamp when receiving the head of the beacon frame, adding delay compensation before sending data, and delaying and starting a physical layer receiving action to offset IP network transmission delay when receiving the data; a data frame processing flow is realized, a header callback function is controlled through a registration frame to respond to a physical layer state change, TCP message data is cached by using an annular queue, and a physical layer interface simulation module analyzes a message, distributes a memory and processes a load at a specified time slot after time sequence synchronization.

The invention discloses a network communication method and device suitable for a space-based distributed operating system, and the method comprises the steps: a satellite gateway node obtains a network layer data packet transmitted by an edge computing node, carries out the processing and packaging of the network layer data packet according to a data link layer protocol in a CCSDS protocol system, and transmits the network layer data packet to a ground station through a baseband and a radio frequency device; and after acquiring the data link layer data packet, the node, connected with the baseband equipment, of the ground station processes the data packet step by step according to a corresponding data link layer protocol and removes a data link layer packet header until an internal network layer data packet is acquired, and sends the internal network layer data packet to a corresponding control node. Establishing a communication tunnel between an edge computing node and a control node in the space-based distributed operating system; and the control node transmits the network layer data packet to the edge computing node through the communication tunnel by using the same communication line. According to the invention, the process running at the edge computing node and the control node can carry out network communication without any adaptation.

The invention discloses a high-performance satellite platform based on a real-time operating system and a wireless bus and a working method of the high-performance satellite platform, and belongs to satellite communication technologies, future deep space exploration and low-orbit satellite constellations. On the basis of an original structure of a satellite platform, a real-time operating system is effectively combined with a wireless bus system, and the real-time operating system comprises a kernel module, a communication module, an equipment driving module, a file system module, an application interface module, a safety module and a fault management module. The wireless bus system comprises a physical layer, a data link layer, a network layer, a transmission layer and an application layer. According to the invention, efficient and reliable communication and task execution capabilities are provided for a satellite platform, the requirements of real-time performance and reliability of a satellite in a complex environment are effectively met through modular design and tight work of the system, and meanwhile, complex lines and interfaces brought by a wired system are avoided.

Provided are a semiconductor device for changing a link speed and a link width of a peripheral component interconnect express (PCIe) link and an operating method thereof. The semiconductor device includes the PCIe link including a plurality of lanes, and a controller configured to transceive a data link layer packet (DLLP) including a number of times of transition and a maximum number of times of transition from an L0 state to an L0p state through the PCIe link, based on a first bit error rate (BER) of a data packet received through the PCIe link and a first criterion value in the L0 state, and determine whether to perform at least one of a link speed changing operation performed in a recovery state, or a link width changing operation performed in the L0p state, based on the number of times of transition and the maximum number of times of transition.

The invention relates to the technical field of industrial communication networks, in particular to a method for quickly forwarding messages from a PCIE (Peripheral Component Interface Express) interface to a WIA (Wireless Interface Architecture) interface, which comprises the following steps of: simultaneously receiving PCIE messages and WIA-FA protocol messages through a hardware logic circuit; analyzing the message in a data link layer to obtain an analysis result comprising data load and address information; packaging the analysis result according to a pre-configuration rule to generate a data frame conforming to a target protocol; and constructing a sending descriptor for the generated data frame, and sending the data frame from a corresponding interface through a direct memory access mechanism. According to the method, parallel analysis and protocol conversion of messages are achieved through a hardware logic circuit, fast address conversion is achieved through a pre-configured address mapping table, and zero-copy data transmission is achieved through a direct memory access mechanism. According to the invention, software protocol stack processing is replaced by a hardware processing flow, so that communication delay and CPU resource consumption are effectively reduced.

The invention discloses a PCIe (Peripheral Component Interconnect Express) switching chip for realizing calculation in transmission, a switch with the PCIe switching chip and a communication system with the PCIe switching chip, the switching chip comprises a physical layer, a data link layer, a transaction layer and a calculation module, and is used for responding to the condition that a specific prefix of a transaction layer data packet is analyzed by the transaction layer and carries a preset calculation instruction; if yes, the calculation module analyzes the calculation instruction analyzed by the transaction layer so as to extract a calculation parameter field in the calculation instruction; the calculation module generates and executes a task of calculating the data in transmission according to the calculation parameter field, and calculation does not need to be started after all the data to be calculated are in place; firstly, part of the currently received data to be calculated is calculated to obtain an intermediate calculation result; and aggregating the subsequent newly received data to be operated and the intermediate operation result. According to the invention, by inserting the programmable calculation path into the PCIe switch, an innovative mechanism of'transmission while calculation 'is realized, the system delay is reduced, and the bandwidth occupation is reduced.

The invention belongs to the technical field of wireless communication networks, and discloses a multi-modal adaptive routing equipment network optimization method based on artificial intelligence, which comprises the following steps of: extracting network flow metadata in a data link layer by adopting deep packet inspection, and analyzing and predicting bandwidth requirements in n periods of time in the future based on a time sequence; planning channel resources by adopting a Nash equilibrium algorithm according to the bandwidth requirement, and generating a channel allocation instruction; synchronously acquiring multi-band channel state data, and constructing a three-dimensional radio frequency environment signal spectrum; analyzing the three-dimensional radio frequency environment signal spectrum, searching a frequency band combination with the minimum interference, and generating a frequency band switching instruction; integrating the channel allocation instruction and the frequency band switching instruction, generating a network QoS optimization strategy, and issuing the network QoS optimization strategy to the routing equipment for execution; and the network transmission efficiency, the security and the adaptive capacity of the routing equipment are improved.

The invention provides a vehicle-mounted passive optical network area gateway and a protocol conversion method. The gateway comprises an interface module which comprises a plurality of communication interfaces, wherein the communication interfaces are used for receiving messages of a low-speed network protocol; the data processing module adopts an FPGA (Field Programmable Gate Array) core board and is used for receiving a message, extracting effective information from the message, packaging the effective information to obtain an Ethernet protocol frame and converting the Ethernet protocol frame into an SDU (Service Data Unit); and the ONU optical module is used for performing data link layer processing on the SDU to obtain an uplink FS burst frame, and performing physical layer processing on the uplink FS burst frame to obtain a burst mode optical signal frame. The gateway can realize data access of multiple paths of CAN nodes, LIN nodes and vehicle-mounted Ethernet nodes at the same time, meets the communication protocol conversion function of low-speed nodes in each region in a real vehicle environment, and is integrated into a whole vehicle all-optical backbone network. The method is used for converting data complying with a low-speed network protocol into data complying with an XGS-PON protocol.

The invention belongs to the technical field of intelligence, and discloses a data link layer analysis method in an industrial field network address conflict environment. Comprising the following steps: deploying a customized acquisition module at a data link layer, capturing an original data frame in real time, and extracting time sequence features and protocol semantics; the time sequence features and the protocol semantics are combined into a high-granularity data set with multi-dimensional features; designing a multi-rule set based on the high-granularity data set of the multi-dimensional features, and performing anomaly detection to obtain an abnormal data frame data set; dividing a conflict domain according to a time window on the basis of the abnormal data frame data set, calculating the proportion of the total flow and the broadcast flow in the conflict domain, judging whether an address conflict problem exists in the conflict domain or not according to the proportion of the total flow and the broadcast flow, and if the address conflict problem exists, performing isolation by using a VLAN (Virtual Local Area Network); in the isolated conflict domain, establishing a communication relation graph in the network to visualize a conflict source; and the stability and the safety of the industrial field network are effectively improved.

Embodiments of the present disclosure provide a data transmission method, a data link layer, a chip interconnection interface, and an electronic device. The data transmission method is applied to the data link layer of the chip interconnection interface, the data link layer communicates with the system bus and the physical layer, the system bus operates in a first clock domain, and the physical layer operates in a second clock domain or in a second clock domain and a third clock domain. The method includes: the data link layer performs packet processing on the first data received from the system bus to obtain second data, and provides the second data to the physical layer; or, the data link layer performs unpacking processing on the third data received from the physical layer to obtain fourth data, and provides the fourth data to the system bus, wherein the data link layer partially operates in the third clock domain, and the first clock domain is different from the second clock domain and the third clock domain, the first clock domain includes a first clock signal, the second clock domain includes a second clock signal, and the third clock domain includes a third clock signal.

The invention provides an EtherCAT slave station port identification and topology diagnosis system and method. Comprising a master station access interface module which is used for being in butt joint with an EtherCAT master station protocol stack and establishing a read-write channel for a data link layer register of a slave station controller; the port state acquisition module is used for analyzing to obtain a physical connection indication, a loop opening and closing state and a communication state of each port, and generating a port state record; the state analysis and control module is used for writing a port opening instruction into a data link layer control register when physical connection exists and a loop is closed, and selecting a preset recovery port of the system to execute register writing when all ports of the target slave station are detected to be in a closed state, so as to obtain a port judgment result; and the topology and diagnosis output module is used for establishing a connection relationship between slave stations based on the port judgment result to generate network topology data. According to the application, unified collection and analysis of registers, automatic judgment and recovery of ports, topology reconstruction and standardized diagnosis output can be realized.

The invention discloses a PCIe-based high-speed data transmission method, device and system, the PCIe-based high-speed data transmission method comprises the following steps: pre-determining a master device and a slave device comprising a standard mode and a high-speed mode in a PCIe link, when the master device is in the standard mode, sending a high-speed mode starting request to a data link layer of the master device by a transaction request layer of the master device; the data link layer of the master device judges whether a high-speed mode is supported according to the current link state, and if yes, the data link layer of the master device sends a high-speed mode starting request to the slave device; when the slave device receives the high-speed mode starting request, the data link layer of the slave device judges whether the high-speed mode is supported or not according to the current link state of the slave device, and if yes, the data link layer of the slave device returns a first agreement signal to the master device; the master device initiates a high speed mode in response to receiving the first agreement signal. According to the invention, high-speed data transmission can be carried out more reasonably and efficiently.

The invention discloses a communication method and system of a wireless ad hoc network, and relates to the technical field of wireless ad hoc networks. The method is applied to a data link layer of the wireless ad hoc network, the wireless ad hoc network comprises a plurality of nodes, each node communicates according to a time frame period, each node comprises an interception mode and a sending mode, and the method comprises the following steps: in the current time frame period, each node executes the following steps: receiving data in the interception mode, and sending the received data in the sending mode; updating a node neighbor table based on the received data; judging whether data sending time is up or not according to the information of each neighbor node in the node neighbor table; and switching to the sending mode to send the data under the condition of determining that the data sending time is up, and switching to the interception mode after the data is successfully sent. The whole wireless ad hoc network does not need complex interactive protocols such as time slot distribution, time slot recovery and the like, so that the decentralized wireless ad hoc network in a real sense is realized.

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 network controller and operating method of the network controller are disclosed. The network controller includes, based on error information transmitted through a plurality of data link layers and a plurality of physical layers respectively corresponding to a plurality of ports managed by one transaction layer, a port monitor circuit configured to determine a number of valid ports among the plurality of ports by monitoring a status of the plurality of ports, a split circuit configured to split and transmit one packet to the valid ports based on the number of valid ports, and a reorder buffer configured to sort an order of second split packets, which are received from another network controller through the plurality of ports, and restore the second split packets received.

The invention relates to the technical field of communication, and discloses a data transmission method and device, computer equipment, a storage medium and a program product. The method is executed by a data receiving end in the PCIe system. The PCIe system further comprises a data sending end; the method comprises the following steps: receiving a transaction layer message sent by a data sending end; when detecting that the transaction layer message has an error, sending a negative acknowledgement data link layer message of a target number of times to the data sending end; the target number of times is determined based on historical data of a negative acknowledgement data link layer message; and receiving a transaction layer message retransmitted by the data transmitting end based on the negative acknowledgement data link layer message. According to the scheme, when the data transmission function is realized, the retransmission efficiency can be improved, and the influence on the short-term bandwidth performance is reduced.

The invention relates to the technical field of multi-network connection, in particular to a Raman optical fiber amplifier remote monitoring system based on multi-network connection. Multiple different network connection modes are achieved through the multiple network connection units, flexible transmission and remote monitoring of data are achieved, a proper network interface can be automatically selected for data transmission according to the current network environment, and the flexibility and stability of network connection are guaranteed. According to the method for packaging the data frames of the different network media on the data link layer, the integrity and effectiveness of the data on the different transmission media are ensured, the system complexity is reduced, and the data transmission efficiency and the system response speed are improved. Especially in a multi-network connection environment, the optimized data link layer processing module can effectively reduce data delay and improve the real-time monitoring capability of the system. Wide area network transmission of data is realized through an MQTT protocol, and safe transmission and real-time monitoring of remote data are ensured.

The invention belongs to the field of computer networks, data compression and mobile internet and wireless communication, and discloses a TCP (Transmission Control Protocol) data packet compression and aggregation self-adaption method, which comprises the following steps of: 1, receiving a TCP data packet and separating a header from a payload; step 2, storing the effective load part; step 3, compressing the head and updating context data according to the serial number, the confirmation number, the mark and the window size field of the head; step 4, combining the compressed header with the effective load to obtain a compressed message; 5, extracting the compressed messages according to a set aggregation threshold value, aggregating the compressed messages, and sending the aggregated compressed messages to a data link layer; and step 6, storing the operation records, comparing the operation records with the previous N operation records, and changing a set aggregation threshold according to a comparison result. According to the invention, the message can be efficiently processed under the condition of a complex network, so that the overall network throughput and the message processing efficiency are improved.

To provide an information processing system, an information processing apparatus, and an information processing method for appropriately supporting a caregiver's assistance for a person to be cared.SOLUTION: An information processing system includes: a device including an application that executes processing corresponding to tacit knowledge of a skilled person; and a server system that transmits a data frame including a media access control (MAC) header, a frame body, and a trailer in a data link layer of communication with the device. The server system transmits the data frame in which an area with a fixed length including a first area storing ability information, a second area storing scene information, and a third area storing device type information, is included in the frame body. The device determines active or non-active of the application based on at least one of the ability information, scene information, and device type information.SELECTED DRAWING: Figure 1

The invention provides a wind turbine generator master control system software and hardware security and credibility mutual recognition measurement mechanism and method, and relates to the field of wind turbine generator control, and the method comprises the following steps: carrying out the hierarchical division of a wind turbine generator master control system, and carrying out the behavior measurement of all hierarchies according to the division result; the method comprises the following steps of: performing hierarchical bidirectional authentication on each hierarchy of a main control system of a wind turbine generator by combining a data link layer encryption technology on the basis of a cross-hierarchy credible mutual recognition mechanism; based on a cross-equipment-level credible mutual recognition mechanism, carrying out equipment-level identity bidirectional authentication between a main control system and a peripheral system of the wind turbine generator; and the change conditions of the behavior measurement result, the hierarchical authentication result and the equipment-level authentication result are tracked in real time, the credible state of the main control system of the wind turbine generator is evaluated, and a response strategy is dynamically executed according to the evaluation result. According to the method, the security problems of hardware tampering, software malicious injection, cross-device communication hijacking and the like can be solved, and meanwhile, the industrial control requirements of real-time performance and low resource occupation are met.

The invention discloses a satellite network encrypted traffic preprocessing method and system under multi-feature fusion, and the method comprises the steps: cooperatively processing original traffic data from two dimensions of a data packet level and a session level: at the data packet level, deleting an invalid TCP control segment and a TLS / DNS key exchange segment to eliminate redundancy, and removing a data link layer header to reduce interference; anonymization mask processing is carried out on an IP header to prevent overfitting, data normalization and standardization operations are executed to balance the feature scale, and meanwhile the data length is unified through truncation and zero filling strategies; in a session level, session splitting is carried out based on a quintuple sharing a source IP, a target IP, a port number and a protocol, statistical features such as the total number of data packets and session duration are extracted to capture time sequence association, and feature vectorization is realized by adopting Min-Max normalization. The double-layer fusion mechanism effectively combines data packet level microscopic fine-grained features with session level macroscopic context information to jointly improve the accuracy of encrypted traffic classification and the model generalization ability.

The invention relates to the technical field of city management, in particular to a multi-global intelligent connection platform comprehensive sensing system and method. Comprising a high-low altitude linkage sensing layer, a data link layer, an AI scheduling layer, an application layer and a closed-loop management module. The high-low altitude linkage sensing layer comprises a high-position video monitoring device deployed in an iron tower base station, a multi-rotor unmanned aerial vehicle in an unmanned aerial vehicle hangar, and an Internet of Things sensor array arranged on the ground, the high-position video monitoring device is coupled with a multispectral camera through a cradle head with an adjustable pitch angle, and covers a monitoring area with a radius not less than 500 meters; the unmanned aerial vehicle hangar is internally provided with a charging pile and a meteorological monitoring unit, the unmanned aerial vehicle carries an edge calculation module and a dual-light camera, and the Internet of Things sensor array comprises a voiceprint sensor, an air quality sensor and a vibration sensor; according to the design, geographical limitation can be broken through, and global seamless monitoring is realized, so that the timely discovery rate of events in a hidden area and the cross-department co-processing efficiency are improved.

The invention discloses a method, a device and a system for realizing remote memory access based on Ethernet, electronic equipment and a medium. The method comprises the following steps of: packaging a message generated by an application layer in a transmission layer by using a source port number field, a destination port number field and an RDMA basic transmission message header; the message header of the message in the network layer comprises a source IP address field, a destination IP address field, a service type field, a total length field and a protocol field, and the service type field, the total length field and the protocol field are used for representing the priority of a frame, the length of the frame and an upper layer protocol respectively; and the message uses a source IP address field and a destination IP address field to replace a source MAC address field and a destination MAC address field respectively for addressing in a data link layer. The communication overhead can be reduced, and the communication performance can be improved.

Provided herein is a PCIe interface device. The PCIe interface device may include a NOP DLLP generator configured to generate a No Operation (NOP) data link layer packet (DLLP) including event information representing an event in response to the occurrence of the event and a transmitter configured to transmit the NOP DLLP to an external device through a link including a plurality of lanes.

The invention relates to the technical field of power grid equipment communication, and discloses a low-voltage power grid communication dual-mode protocol stack implementation method, which comprises a physical layer, a data link layer and an application layer, the physical layer integrates two physical layer architectures of an HPLC physical layer and an HRF physical layer at the same time, and the two physical layers are connected with each other through a PMD layer and a PLCP layer which are independent but have a unified interaction interface. Data interaction with a hardware bottom layer of the communication unit is realized; the data link layer comprises a media access control sub-layer and a dynamic network management sub-layer NET, the media access control sub-layer comprises an HPLC (High Performance Liquid Chromatography) collaboration sub-layer and an HRF (High Performance Radio Frequency) collaboration sub-layer, and each collaboration sub-layer comprises an LLC (Logical Link Control) sub-layer and an MAC (Media Access Control) sub-layer and corresponds to the two physical layers; and the network management sub-layer synthesizes the effectiveness of the dual-mode channel and selects the most reasonable path as a service path. Through the modular design, normalization of a wireless link and a carrier link is realized, and the communication reliability in a complex power grid environment is effectively improved.

According to the communication method and the communication device, a sensing layer is introduced into a communication protocol stack to realize information interaction between different protocol layers, and the scheme has universality and is beneficial to improving the efficiency of data transmission. The method may comprise: receiving a first uplink data packet; the first uplink data packet may comprise a first sensing layer packet header, and the first sensing layer packet header may carry first control information and / or a first transmission parameter; wherein the first control information is used for requesting a second transmission parameter; the first transmission parameter can be understood as a parameter provided by the first application layer to the first data link layer; the second transmission parameter can be understood as a parameter provided by a second data link layer to the first application layer; the first uplink data packet can be a data packet corresponding to the first service flow.

The invention relates to the technical field of integrated circuits and provides a physical IP verification device and method, computer equipment and a medium. The physical IP verification device comprises a first reusable multimode test sequence generator, a verification component physical interface, a second reusable multimode test sequence generator and a verification component serial interface. Therefore, different simulation requirements and scenes such as accelerated simulation efficiency and integrated verification can be considered, protocol consistency verification, functional verification completeness of a physical layer subsystem level and standardized protocol verification are supported, and abundant test vector sets are provided; according to the method, the requirements of butt joint test scenes and completeness verification of different levels such as a transaction layer, a data link layer and a physical layer can be met, debugging interaction interfaces and debugging means with rich levels are supported, different physical interface versions and interface data bus bit widths are supported, and hierarchical and fine-granularity low-power-consumption management is also supported.

A method for transmitting secured Ethernet frames on a communication line, the method including the following in a transmitter module: receiving an Ethernet frame comprising payload data from a network layer; retrieving a secure policy, defining the type of security to be applied to the Ethernet frame; producing an initialization vector based on an encryption counter and a physical address of the transmitter module; creating an authentication tag by applying an authentication algorithm on the secure policy, the initialization vector and the payload data using a shared key and the initialization vector; adding the secure policy, the initialization vector and the authentication tag to the payload data to create a secured Ethernet frame; and sending the secured Ethernet frame to a data link layer for transmission on the communication line.

The invention discloses an automatic testing device and method for a self-defined bus of a DCS, and belongs to the technical field of testing of industrial control systems.The device comprises a controller, an FPGA module, an adapter module, a main control case and a bus adapter card, the FPGA module serves as a lower computer to execute physical layer and data link layer processing of a communication protocol, and achieves electrical matching with a DCS custom bus through an adapter. A customized backboard and a bus adapter card are arranged in the main control case and are used for connecting a to-be-tested main control card, an I / O card and a communication card; the method is based on a layered protocol architecture, LVDS signal transmission and 4B / 5B coding are adopted in a physical layer, CRC32 verification and frame packaging are carried out in a data link layer, and node simulation, message framing, fault insertion and state monitoring are completed in an application layer. The method can effectively solve the problem that the private protocol bus lacks general testing means, and has high expandability and deep testing capability.

The invention provides a 10-gigabit Ethernet giant frame unpacking and packing device based on an FPGA (Field Programmable Gate Array), and belongs to the technical field of network data packet processing. By arranging the standard frame combination unit, the giant frame splitting unit, the parameter configuration module and the clock module, the device can realize the functions of splitting giant frames to form standard frames, combining the standard frames to form the giant frames, dynamically configuring the MTU, monitoring the transmission quality of a data link in real time and the like. According to the invention, the data frames can be processed at the data link layer, the influence on the running speed of the 10 Gbps Ethernet is small, and the data frames can be quickly processed and forwarded. Meanwhile, flexibility is achieved, and parameters can be dynamically configured according to the specific operation environment so as to achieve the best operation state in the current environment.