215 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 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 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.

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.

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.

A networking device and method for providing a predictable membership scheme for policy-based virtual local area networks (VLANs). In the event that identical behavior toward incoming expected and unexpected untagged frames is desired, a first membership scheme imposes a first set of rules while a second membership scheme, having a second set of rules, is used if expected and unexpected untagged frames are treated differently.

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 discloses a monitoring method for an application program of a mobile terminal, which comprises the following steps: S1, selectively adding the applications required to be monitored; S2, sending out data requests by the applications; S3, judging whether the applications that send out data requests belongs to the applications to be monitored; S4, if yes, ejecting out a prompt frame for prompting whether the requests are permitted, if not, responding to the data requests and carrying out related operation; and S5, if the selection is allowed, responding to the data requests and carrying out related operation, if the selection is not allowed, automatically abandoning the data packet, and rejecting the data requests. Due to the adoption of the method, the monitoring of application programs on mobile terminals including phones and the like can be realized so as to avoid that networking, short message sending and the like are performed by the application programs while a user does not know.

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.

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 invention discloses a narrowband ad hoc network communication protocol applied to a wireless electronic clinical thermometer, which comprises node networking and networking communication, and nodes comprise a root node, a relay node and a terminal node. Networking communication can be used for communication among an upper computer, a root node, a relay node and a wireless electronic thermometer with a built-in ad hoc network terminal node, the upper computer, the relay node and an electronic thermometer ad hoc network module follow the same data communication protocol format, and the datacommunication protocol format is composed of a frame header, a frame body and a frame check sequence. The lengths of the frame header and the frame body are variable according to different frame types. The invention provides a lightweight and dynamic narrowband ad hoc network communication protocol format and an implementation method. The protocol is high in reliability and stability, clear in structure, low in hardware requirement and easy to develop and implement.

The invention discloses a GOOSE message sender restart frame judgment method, and the method comprises the following steps: on the basis of only judging the StNum and SqNum of a GOOSE message head, introducing a judgment condition of GOOSE message head time, and according to the judgment condition, if an unexpected message is a message of which the StNum is changed, determining that the message head time is increased and the GOOSE sender is restarted, otherwise, determining that the message is an abnormal message; if the unexpected message is the message with the unchanged StNum and the changed SqNum transmission, determining that the message header is restarted by the GOOSE sender when the time is increased, determining that the message header is a heartbeat message when the time is unchanged, and determining that the message header is an abnormal message when the time is reduced. The method is suitable for any GOOSE networking mode, the reliability can be effectively improved in a single-network mode, and historical messages and re-enlightenment messages are distinguished; In the dual-network mode, the GOOSE sender restart judgment time can be shortened, and the response speed is increased.