219 results about "Frame (networking)" patented technology

The invention provides solutions, including devices, systems, methods and software, for allowing interoperability between legacy stations and extended-range stations in a wireless network. Merely by way of example, an access point might be configured to transmit communications (such as beacon frames, broadcast frames, multi-cast frames, etc.) in a first mode and / or a second mode. The first mode might not employ extended-range technology, such that communications transmitted in the first mode can be received and / or interpreted by legacy stations, while the second mode might employ extended-range technology, such that communications transmitted in the second mode can be received by extended-range stations outside the range of basic-range communications. As another example, the access point might be configured to establish transmission “windows,” such that legacy stations are free to transmit during a first time period, in which extended-range stations are prohibited from transmission, followed by a second time period, in which extended-range stations are free to transmit, while transmission from legacy stations is prohibited.

The invention relates to a dynamic networking method and a communication method based on RS-485. The dynamic networking method comprises the following steps: step S1, sending a query frame to all slave machines through an RS-485 bus at every a heartbeat time interval by a host machine; step S2, sending query response frames to the host machine by all the slave machines on the RS-485 bus after receiving the query frame; step S3, judging whether the slave machines of which the addresses are not within an effective addressing range exit by the host machine, and if the addresses of the slave machines are not within an effective addressing range, identifying the slave machines as to-be-addressed equipment; step S4, broadcasting an addressing frame by the host machine through the RS-485 bus; and step S5, receiving the addressing frame corresponding to an ID of the slave machine by each slave machine and changing the current slave machine address into a new slave machine address. According to the method disclosed by the invention, the host machine is used for periodically querying address information of the slave machines and identifying new equipment in a network by comparing the current address information of the slave machine with the effective addressing range so that each piece of new equipment has an effective address, and thus the problem of inconvenience caused in dynamic addition and deletion of nodes because the R-485 bus adopts a master-slave type communication method is solved.

The invention discloses a spatial information network isomerism dynamic networking method based on a layered autonomous area. The method includes the following steps that according to components and functions of all parts in the whole spatial information network, a spatial information network system structure is set up; according to the properties, the functions, the zone positions and the requirements, all nodes in the network are divided into different layered autonomous areas with independent networking routing strategies; boundary nodes are selected to separate a control link from a service link and the inter-domain control information transmission and the intra-domain control information transmission are separated; an intra-domain sub-layer which is in line with international standards and an inter-domain sub-layer which has the same protocol and functions on all the nodes are set up to form a layered autonomous area model network protocol stack frame. According to the spatial information network isomerism dynamic networking method based on the layered autonomous area, coupling is little, the network nodes are plugged when needed, and the network managing control efficiency is high.

The invention discloses a vehicle-ground broadband access method based on a wireless mesh network technology, in which an access method for wireless mesh points consist of gateway nodes and a plurality of access points is specified in a layer 2 address-based layer 2.5 protocol between a layer 2 protocol and a layer 3 protocol. The method comprises the following steps: a, creating and updating a tree-based routing table for each wireless mesh point, which is used for recoding physical addresses for a parent node and a child node, and creating and updating a proxy table for each wireless mesh point, which comprises table entries of all vehicle-carried subnet point below the tree-based routing table of the wireless mesh point; b, data frame transmission, which realizes data format conversion, data transmission, data receiving and forwarding between a wireless mesh network and a vehicle-carried subnet as well as between wireless mesh gating nodes and a public network through the wireless mesh points; c, node switch, in which channels of the same frequency are adopted for access channels of all wireless mesh point for realizing seamless switching between the nodes. The method has the advantages of convenient networking, low cost, high-speed for data transmission, high reliability.

The invention provides an indoor visible light communication (VLC) hybrid networking scheme based on room division multiplexing (RDM) and an implementation method for switching of the indoor VLC hybrid networking scheme. During hybrid networking, an upstream adopts WiFi (wireless fidelity), and a downstream adopts the VLC based on an LED (light emitting diode) array. A VLC network scheduler is used for reading and writing data frames from / to an external network and configuring and managing the network, so that an RDM multi-address access mode is realized; meanwhile, switching of a user between different rooms can be efficiently finished; compared with a conventional broadcast type indoor VLC network, the indoor VLC hybrid networking scheme has the advantage that the handling capacity of the network is greatly improved.

The present invention provides a mixed access and sending method and device for packet switching and optical transport network services, through which the received packet switching service data is mapped into an ODUflex data frame structure without a fixed rate by the mixed service receiving module, or Map the received optical transport network service data to the corresponding optical channel data unit ODUk data frame structure; cross-schedule the ODUflex data frame or ODUk data frame mapped by the mixed service receiving module to the corresponding optical transport network interface module by the cross-connect module; The optical transport network interface module maps the received ODUflex data frame or ODUk data frame into an optical transport network data frame meeting the first preset requirement, and sends the mapped optical transport network data frame. Therefore, in the same device, the mixed input and transmission of the packet switching service and the optical transport network service can be realized, so the cost of networking and maintenance of the network using the packet switching technology and the optical transport network technology can be reduced.

The invention provides a broadband power line carrier and broadband wireless dual-mode communication system based on the same OFDM system. The advantages of multipath fading resistance and strong anti-interference capability of the OFDM technology are fully utilized; an efficient coding modulation technology, a robust and flexible frame structure design, a signal processing technology, an adaptivetechnology and a networking technology are combined; the advantages of power line carrier communication and a micro-power wireless communication channel are brought into full play; the defects of pure power line carrier communication or micro-power wireless communication are overcome; and a single OFDM system is fused into a broadband power line carrier and a broadband wireless communication system, deep algorithm fusion is carried out on the broadband power line carrier and a broadband wireless physical layer, the complexity and cost of a dual-mode product are reduced, and a high-performance, low-power-consumption and low-cost implementation framework is achieved. The interference sources of power line carrier communication and wireless communication are completely different, a diversityreception effect is formed, the problem of blind spots is efficiently solved, and complete, robust and stable communication network coverage is formed.

Datalink frames or networking packets contain protocol information in the header and optionally in the trailer of a frame or a packet. We are proposing a method in which part of or all of the protocol information corresponding to a frame or a packet is transmitted separately in another datalink frame. The “Separately Transmitted Protocol Information” is referred to as STPI. The STPI contains enough protocol information to identify the next hop node or port. STPI can be used avoid network congestion and improve link efficiency. Preferably, there will be one datalink frame or network packet corresponding to each STPI, containing the data and the rest of the protocol information and this frame / packet is referred to as DFoNP. The creation of STPI and DFoNP is done by the originator of the frame or packet such as an operating system.

The invention relates to an HPLC communication networking method, and relates to power line carrier communication, and the method comprises the steps of enabling a current node to judge whether to start a network access flow or not according to a preset evaluation strategy; after the network access process is started, selecting one node as a candidate proxy node according to the channel quality and hierarchy of the neighbor nodes and the number of received beacon frames; and generating an association request frame according to the timeout occurrence time of the timer so as to send a network access request to the candidate proxy node. According to the invention, the probability of agent change during network access is reduced, the number of SOF frames in a network optimization stage is reduced, and the overall communication efficiency of a carrier channel is improved.

This invention discloses a method for safely transmitting sigal data of wireless locomotives including a wireless transmission channel structure and a safety transmission protocol, in which, the transmitting channels can be two modes of digital transmission broadcast stations and GSM-R: 1, since the data channel structure of the digital transmission broadcast stations is composed of a dynamic networking, a star structure, a mode of frequency alternation between stations and address selection, a transmission way and a communication protocol, it solves the problem of interference of same frequencies, conflict of transmission frames, locking the broadcast stations, signal covering, hand off and communication protocols, 2, based on the structure of the data transmission channel of the GSM-R digital mobile communication channel, the access way of loading and the ground devices and device interfaces, 3, related transmission protocol, 3-D control and signal response confirmation can secure the reliable and safe transmission.

Method and system for analyzing a linear programming problem or any other problem involving inequalities constraints set relating to multiple variables. An initial feasible region is calculated based on a sub-set of the constraints set. The feasible region is updated based on the additional constraints added one at a time. The method checks for feasibly, identifies active constraints, and provides end-points of the feasible region. The method may be applied to a control system or to a crossbar switch handling routing between multiple input and multiple outputs, such as digital data networking switch used to route TDM digital data streams being packet, frame or cell based, in a LAN, WAN, MAN or Internet application.

The invention discloses a parameter agility time division multiple access (TDMA) communication method, and relates to a networking and service transmission technology for a frequency hopping TDMA satellite communication system. The frequency hopping TDMA satellite communication system is networked by methods such as variable-rate frame structure configuration, small and large station variable-rate intercommunication and modulation and demodulation parameter agility; on the basis of networking, frequency hopping transmission and receiving and variable-rate emergency packing of service data are realized; and a technical effect of intercommunication of services under hybrid networking of small and large stations is achieved. The method has the characteristics of reliable control method, high station adaptability and high system resource utilization rate and is particularly suitable for networking and service transmission processes for the TDMA frequency hopping satellite communication system based on satellite frequency hopping forwarding.

The invention relates to a communication method and system based on LoRa networking. The method comprises the following steps: acquiring a time frame of data transmission based on LoRa networking, wherein the time frame comprises a fixed time slot, a shared time slot and a retransmission time slot; acquiring priorities of the data transmission nodes; allocating a fixed time slot to the core node;allocating a shared time slot to the common node; the common node competes for the shared time slot by adopting a CSMA / CA mechanism; when the data transmission fails, the node which fails in data transmission adopts a retransmission time slot to perform data retransmission; after the data transmission is completed, sending a synchronous data frame to the data transmission node; and each data transmission node performs clock compensation on the local real-time clock according to the synchronous data frame, and synchronizes the data transmission node and the gateway clock. According to the invention, the throughput of data transmission can be improved, and the efficiency of data transmission in LoRa networking is improved.

The invention provides a multi-band fusion-based power distribution and utilization telephonic communication wireless Ad-Hoc network method. The method comprises the steps of establishing a multi-band fusion-based wireless Ad-Hoc network protocol model, expanding the standard-frame format of an adaptation layer in the multi-band fusion-based wireless Ad-Hoc network protocol model, adding the scanning information and the real-time indication scheduling information for scheduling the multi-band and multi-channel transmission and service data flow, and conducting the multi-band adaptation for the multi-band fusion-based wireless Ad-Hoc network. According to the method, the characteristics of wide geographical distribution of intelligent power distribution and utilization, multiple measurement monitoring points, high communication reliability and high transmission bandwidth are realized. Meanwhile, the combined scheduling of 230M / 433M / 470M / 780MHz sub-networks and a backbone network is realized based on the cross-band networking technology. The communication is enabled based on a multi-band- networked multi-mode-access collaborative communication mechanism. Therefore, the system provides novel power wireless communication techniques for realizing flexible communication transmission and networking modes, and is applicable to complex application environments and multi-service loading requirements. Based on the method, the autonomous self-healing networking communication is realized. Therefore, a novel communication means is provided for the smart grid.

The invention relates to a network building method of semi-mesh network and relative system. Wherein, the invention uses at least three exchangers as network nodes; the network topology is connected by semi-mesh network, via network chain to send and receive grouped frame and use chain layer address, interlayer address, to build database, topology driver display, host and resource node device double-address linkage list, test the block network, interlayer address linkage collection and full-network backup display linkage list base, and start relative backup linkage list. The invention can avoid false circuit, with face-to-face display linkage and low cost.

The invention discloses a frequency hopping communication method based on a self-adopting channel. A main station and two slave stations are used to form a wireless networking communication system. The frequency hopping communication method comprises steps that S1, the main station and the slave stations are used as communication nodes; S2, m frequency points F1-Fm distributed in the whole working frequency are selected randomly from K fixed frequency hopping frequencies f1-fK of the wireless networking communication system, and are used as handshake communication frequencies among links; S3,after a node 1 is electrified, a slot 1- a slot 7 of an access synchronous frame are divided, and the self-adapting access of the various nodes is completed; S4, the self-adapting access is completed, and thereafter a slot 1-a slot 6 of a self-adapting channel frame are divided, and then self-adapting channel detection is carried out; S5, according to a self-adapting channel detection result, a self-adapting channel transmission strategy is made, and networking communication among the nodes is completed. Bad influences of working frequency bands caused by interference frequency points are effectively reduced, and accurate and rapid frequency hopping communication is facilitated.

A data processing system can comprise a first module having a workspace and configured to execute a task that can request access to a frame in a system memory, a queue manager configured to store a frame descriptor which identifies the frame in the system memory, and a memory access engine coupled to the first module and the queue manager. The memory access engine copies requested segments of the frame to the workspace and has a working frame unit to store a segment handle identifying a location and size of each requested segment copied to the workspace of the first module. The memory access engine tracks history of a requested segment by updating the working frame unit when the requested segment in the workspace is modified by the executing task.

The invention discloses a Mesh networking method and device, gateway equipment and a storage medium, and relates to the field of wireless networks. The method comprises the following steps: monitoring a detection request frame on a target channel, wherein the detection request frame is automatically sent on the target channel by to-be-accessed gateway equipment in a non-network-distribution state; in response to the monitored detection request frame, indicating that the to-be-accessed gateway equipment meets a networking condition, and receiving a networking instruction, establishing a Wi-Fi protection setup WPS connection with the to-be-accessed gateway equipment; synchronizing networking configuration to the to-be-accessed gateway equipment through the WPS connection, so that the to-be-accessed gateway equipment accesses a Mesh network based on the networking configuration. By adopting the Mesh networking method provided by the embodiment of the invention, a user does not need to manually trigger the to-be-accessed gateway equipment, and Mesh networking can be completed only by triggering a Mesh key of the accessed gateway equipment once, so that the networking operation steps are simplified, and meanwhile, the success rate of Mesh networking is improved.

The invention provides a dual-mode inter-mode cooperation method and an electric Internet of Things system, and belongs to the field of electric Internet of Things wireless communication. The method comprises the steps that if a mode A of a sending node is disconnected through communication of a link A, the sending node performs inter-mode cooperation, requests a mode B of the sending node to construct a network frame and forwards the network frame through a link B, wherein the type of the network frame is an inter-mode forwarding frame; and after a receiving node receives the inter-mode forwarding frame through the mode B, inter-mode cooperation is carried out, and the inter-mode forwarding frame is sent to the mode A of the receiving node, so that the mode A of the receiving node obtains communication data. According to the method, a collaborative networking function is provided, inter-mode beacon frame and networking command frame forwarding is realized, and the network networking reliability is improved; and a single-hop service transmission path backup and a selection function is provided, data frame and command frame forwarding between single-hop modes is realized, and the network data transmission reliability is improved.

The invention provides a physical frame communication method for a wireless digital multimedia broadcasting system. The physical frame communication method comprises the steps that wireless broadcast transmitting equipment sends a wireless signal composed of a plurality of physical frames to wireless broadcast receiving equipment, wherein the physical frame comprises conventional orthogonal frequency division multiplexing symbols, the conventional orthogonal frequency division multiplexing symbols comprise a signaling symbol carrying a first mapping unit, a data symbol carrying a second mapping unit, and / or a frame tail symbol carrying a third mapping unit; and the first mapping unit, the second mapping unit and the third mapping unit are mapped into virtual resource particles of virtual resource grids used for describing the volumes of the physical frames according to a preset mapping mode, wherein the virtual resource grid comprises a first structural taper, a second structural taper and a third structural taper. The physical frame communication method for the wireless digital multimedia broadcasting system provided by the invention can support the broadcast transmission demands of the next generation of wireless broadcast on application scenes, networking ability, flexible, efficient and reliable transmission and other aspects.

The embodiment of the invention provides a high-speed carrier ad hoc network data link end machine time synchronization method and system, and the method comprises the steps: obtaining a main node through a competitive preferential mode after at least two nodes with clocks are powered on; using the main node as a reference clock source for coarse synchronization; enabling the main node to periodically send networking broadcast frames to the periphery; self-organizing the remaining nodes into a communication network according to the networking broadcast frame; enabling the reference clock source to broadcast a synchronous broadcast frame; enabling a node to be subjected to time synchronization to receive and analyze the synchronous broadcast frame; enabling the node to be subjected to time synchronization to adjust own absolute time according to the time delay in the analysis result to realize coarse synchronization; and finishing fine synchronization of time by adopting a mutual synchronization method according to the correction amount. According to the invention, the problems of poor robustness and interference resistance of traditional master-slave fine synchronization are solved, and the problem of slow convergence speed of traditional mutual synchronization is also overcome.

A method for constructing wireless ad hoc network and a data transmission method of wireless ad hoc network are disclosed. The construction method realizes the construction of the network according tothe networking frame broadcast by the center node after power-up, and each node determines the hierarchy according to the received networking frame, thereby forming a multi-layer wireless network, and the whole wireless network is completed by itself in the construction process, thereby realizing the self-organization of the wireless network. The invention solves the problem that the point-to-point direct wireless communication can not be carried out because of the long distance, and ensures the effective construction of the wireless network. The data transmission method provided by the invention ensures the effective transmission of the data transmission according to the hierarchical forwarding mode. Not only solve the problem of data collision caused by multi-node data transmission, butalso if a node fails to forward, another node will automatically forward, which will not affect the data transmission and keep the network smooth.

The invention discloses a power transmission and transformation equipment Internet of Things node equipment wireless communication method. A broadcast channel, a downlink control channel, a multicastchannel, a downlink shared channel, an uplink random competition channel and an uplink shared channel are arranged in a communication channel between master equipment and slave equipment in the powertransmission and transformation equipment Internet of Things; different channels are distinguished through channel type fields of the MAC frame header; communication processes between the master device and the slave devices are set and include a node broadcasting process, a random access process, a pre-allocation registration process, a scheduling communication process of an uplink shared controlchannel, a discontinuous reception DRX scheduling communication process, a communication process of a downlink shared control channel, a packet fragmentation process and the like. According to the invention, standardized access of mA-level power consumption state sensing sensors with large data volume such as power transmission and transformation equipment Internet of Things waveforms and the likecan be satisfied, networking between the aggregation node and the access node is realized, and the requirements of mA-level communication power consumption, sensor synchronous sampling and reliable networking coverage of a service scene are satisfied.

The invention relates to the technical field of communication, and discloses a wireless NDD (Named Data Networking) data processing method, device and system for reducing energy consumption of a wireless terminal. The method comprises the steps of redefining Bitmap of 802.11, indicating unicast data by using the first bit as 0, indicating multicast data by using the first bit as 1, and indicatingthat each STA corresponding to the multicast has cached multicast data respectively by using the values 1 of AIDs (Association ID) at the at least two different positions in the Partial Virtual Bitmap; then performing corresponding processing on the unicast data and multicast data through the redefined Bitmap and the TIM mechanism of 802.11. Correspondingly, when the STA judges the received data are the multicast data based on a multicast identifier, waiting for transmission of the multicast data and avoiding transmitting a PS-Poll frame, but avoiding waking up other STA having nothing to do with the multicast in a way of ignoring the Beacon frame.

The invention relates to a motion control bus communication method based on an Ethernet physical layer. The Ethernet is used as the motion control bus standard, and the Ethernet networking mode is realized on the basis of an annular structure. The output of a master station is connected with the input of a first slave station; the output of the first slave station is connected with the input of a second slave station until the output of the last slave station is connected to the input of the master station; the slave station receives a data frame; according to the its own address, data required to receive is extracted from the data frame; meanwhile, data required to send replaces the data required to receive and is placed onto the corresponding position in the data frame and is sent out; extraction and replacement are synchronously carried out; and each slave station carries out the same processing in sequence. According to the motion control bus communication method based on the Ethernet physical layer, which is disclosed by the invention, a communication means between a controller and a driver can be provided for the high-precision and high-speed motion control system, and the motion control of a multi-axis system is realized.

The embodiment of the invention provides a method for generating a video cover image, which comprises the following steps: a video network terminal receives video data returned by a video network server; When the video data is played, the video network terminal receives the selection operation for the video frame image. According to the selection operation, the video network terminal generates theselection information of the target image; The video networking terminal sends the selection information of the target image to the video networking server. The video networking server is used for extracting the target image from the video and setting the target image as the cover image of the video by using the selection information of the target image. In the embodiment of the invention, the video networking server extracts the target image from the video by using the selection information of the target image, and sets the target image as the cover image of the video. Users do not need to capture images and upload them to the video server, which saves users' operation. There is no need to send image data between the video network terminal and the video network server, which reduces thebandwidth requirement.