25 results about "Beacon period" patented technology

A system for transmission of primary and secondary data, the system comprising: a bus; a parent node coupled to the bus; and a plurality of child nodes, each coupled to the bus, wherein: the parent node is configured to periodically transmit a time domain multiplexing (TDM) cycle beacon to the bus, wherein the TDM cycle beacon signals a start of a primary data transmission interval, and wherein the primary data transmission interval is a period reserved for transmission of primary data by the parent node and the plurality of child nodes; the parent node and each of the plurality of child nodes are operable to, responsive to the TDM cycle beacon, transmit primary data for a current TDM beacon period associated with the TDM cycle beacon to the bus during the primary data transmission interval; and the parent node and the plurality of child nodes are operable to transmit secondary data to the bus during a secondary data transmission interval between an end of the primary transmission interval and transmission by the parent node of a next TDM cycle beacon.

The invention discloses a transmission time sequence method and system of a low-power-consumption wide-area wireless transmission system, and belongs to the technical field of low-power-consumption wide-area wireless communication. Real-time network time is broadcasted in a beacon window time period so as to synchronize all terminals receiving the real-time network time; in a data transmission period, data transmission is carried out, the data transmission period is divided into a plurality of transmission sub-windows, a plurality of terminals accessed to a current gateway are respectively distributed with corresponding transmission sub-windows, and each terminal carries out data transmission with the current gateway in the corresponding transmission sub-window. The gateway broadcasts real-time network time and synchronizes the time of the terminal and the gateway in a beacon window time period, and a clock synchronization module does not need to be additionally added; after time synchronization, each terminal can realize communication with the gateway based on the allocated transmission sub-window based on the time sequence design of each transmission sub-window in the beacon period, so that time division multiplexing of channel resources is realized, and the air interface transmission efficiency during communication between the terminal and the gateway can be improved.

This application provides an adaptive time synchronization compensation method, a terminal device, a gateway device, and a system. The adaptive time synchronization compensation method includes: receiving a beacon frame from a gateway; parsing a timestamp, an actual beacon period value, and an over-the-air transmission time value carried in the beacon frame, wherein the timestamp represents the absolute time at which the gateway begins sending the beacon frame, and the actual beacon period value is the actual interval between the start times of two adjacent beacon frame transmissions, as measured by the gateway based on its hardware clock; recording the local reception completion time of the beacon frame on the terminal device side; calculating a first time deviation between the local clock of the terminal device and the gateway clock based on the timestamp, the over-the-air transmission time value, and the local reception completion time; correcting the local clock of the terminal device according to the first time deviation; and calculating and determining subsequent periodic reception time slots of the terminal device based on the corrected local clock, the actual beacon period value, and predefined reception time slot parameters.

The invention relates to the technical field of power distribution network area topology identification, in particular to a combined topology identification method and system based on HPLC (High Performance Liquid Chromatography) and characteristic current injection, comprising the following steps: a control node broadcasts and sends a central beacon signal carrying a characteristic current sending instruction to a broadband power line carrier communication network; the characteristic current sending node sends a corresponding characteristic current signal by taking the initial position of a CSMA time slot area of a beacon period in which a central beacon signal is located as the initial time of sending the characteristic current signal, and the characteristic current identification node detects whether the characteristic current signal exists in a characteristic current signal detection window of the beacon period in which the central beacon signal is located; a detection result is reported to the control node, and the control node obtains a topology identification result of the power distribution area according to the detection result; according to the method, the beacon signaling and the whole network broadcasting system of the existing HPLC communication network are reused, so that the topology identification efficiency of the power distribution area is comprehensively improved, and the reliability and the accuracy of identification are enhanced.

This application provides a communication method and apparatus, relating to the field of communication technology. In this communication method, the beacon period includes N synchronization periods, where N is an integer greater than 4. A first communication device can transmit control frames during a time period within the first synchronization period of the N synchronization periods. Because the beacon period is divided more finely, the time interval between control frame transmissions by the first communication device is shorter, which helps reduce the latency of control frame transmission. Furthermore, the first communication device has more opportunities to transmit control frames within a beacon period, which helps improve the success rate of control frame transmission.

The present application discloses a method, device, electronic device and readable storage medium for receiving beacon frames, which belongs to the field of communication technology. The method includes: obtaining multiple first beacon periods based on the reception time of multiple received beacon frames, and any one of the multiple first beacon periods is the difference between the reception time of two adjacent received beacon frames; predicting the second beacon period within the reference time period based on the multiple first beacon periods, and the reference time period is the time period after the reception time of the last received beacon frame; receiving a new beacon frame at a target time within the reference time period, and the difference between the target time and the reception time of the last received beacon frame is the second beacon period. Since the second beacon period is predicted based on multiple first beacon periods, the second beacon period is more accurate, and the success rate of receiving new beacon frames according to the second beacon period is higher, thereby improving the success rate of receiving beacon frames.

A system for transmission of primary and secondary data, the system comprising: a bus; a parent node coupled to the bus; and a plurality of child nodes, each coupled to the bus, wherein: the parent node is configured to periodically transmit a time domain multiplexing (TDM) cycle beacon to the bus, wherein the TDM cycle beacon signals a start of a primary data transmission interval, and wherein the primary data transmission interval is a period reserved for transmission of primary data by the parent node and the plurality of child nodes; the parent node and each of the plurality of child nodes are operable to, responsive to the TDM cycle beacon, transmit primary data for a current TDM beacon period associated with the TDM cycle beacon to the bus during the primary data transmission interval; and the parent node and the plurality of child nodes are operable to transmit secondary data to the bus during a secondary data transmission interval between an end of the primary transmission interval and transmission by the parent node of a next TDM cycle beacon.

A wireless transmission scheduling method is proposed. The method may be a synchronous media access control (MAC) wireless transmission scheduling method optimized for a user datagram protocol (UDP) of a personal wireless network-based data transmission system. The method may include setting a superframe period, a beacon period, and a contention period by a master station in a network. The method may also include calculating transmission periods of one or more slave stations participating in the network and a transmission period of the master station. The method may further include transmitting information about the calculated transmission periods of the one or more slave stations to the one or more slave stations participating in the network. The method may further include transmitting data by the one or more slave stations and the master station in the transmission periods assigned to the one or more slave stations and the master station.

The present invention relates to a method for directional access of a terahertz wireless network with high efficiency and high time slot utilization rate, belonging to the field of terahertz wireless networks. The present invention proposes an adaptive reduced beamforming mechanism, which operates in the CTAP period of the superframe. On the premise of ensuring the beamforming effect, the beamforming operation is reduced; a node stationary information publishing mechanism based on motion cooperative control and probability is proposed, which operates in the CTAP period of the superframe to ensure or estimate the stationary state of the node, and then publishes the information that the node will remain stationary in the future in a zero or low additional overhead manner; an adaptive low-overhead mechanism for transmitting the sector number is proposed, which operates in the CAP period and the Beacon period of the superframe. In a zero or low additional overhead manner, the sector number where the data frame source node is located on the data frame destination node is transmitted from the data frame source node to the data frame destination node through PNC, so as to facilitate the quick alignment of the antennas of the data frame source and destination nodes.

The invention relates to the technical field of wireless communication of the Internet of Things, in particular to a star communication method and system of the building Internet of Things based on time sequence isolation, and the method comprises the steps: constructing a communication time axis of radio frequency communication, dividing the communication time axis into a plurality of continuous communication cycles, and generating time domain segmentation configuration information of each communication cycle; wherein the time domain segmentation configuration information defines a beacon time period, a control time period, a report time period and a synchronization time period which are arranged in sequence. According to the invention, a communication time axis based on strict time sequence isolation is constructed, the terminal equipment is forced to lock a reporting function in a control time period by issuing a time period control flag bit in a beacon frame, the exclusive access of a control instruction to channel resources is realized, the mechanism eliminates the interference of an uplink data stream to a downlink control instruction, and the performance of the terminal equipment is improved. Uncontrollable delay in the prior art is reduced to deterministic time slot transmission, and the problem that in the prior art, the control success rate is low under high concurrency is effectively solved.

Enabling secondary channel access during beacon and groupcast traffic and shortening the periods of beacon and groupcast traffic may be provided. Enabling secondary channel access can include advertising a capability to exchange traffic on secondary channels during beacon period. During a beacon period, beacons and groupcast traffic are transmitted on a primary channel and traffic is exchanged with the one or more clients on one or more secondary channels. Enabling secondary channel access between OBSSs can include one BSS transmitting beacons and groupcast traffic on a primary channel and another BSS exchanging traffic on secondary channels. Shortening beacon periods can include offsetting or otherwise organizing Delivery Traffic Indication Map (DTIM) beacons and groupcast traffic.

The application discloses a channel access method based on a dual-mode network, which comprises the following steps: a concentrator CCO node obtains a node MAC address list based on a white list mechanism before network operation, so that the CCO node can make the dual-mode nodes in the MAC address list enter the network during network operation; the identity of each dual-mode node in the network is identified through a short address; the time slot structure of a beacon period on a carrier channel and a wireless channel is allocated with the use right according to a preset allocation and use mechanism according to the short address of the dual-mode network node, so that the transmission of signals is carried out according to the allocation of the use right; wherein the dual-mode network refers to the carrier channel and the wireless channel, the beacon period contains N+1 subframes, N is the number of the dual-mode nodes in the MAC address list, the time slot structure of each subframe is consistent, and the time slot structure of each subframe comprises a dual-function time slot and a CSMA time slot area. The application can reduce channel overhead, has strong robustness, and can maintain the smooth operation of the whole network under a complex channel environment.

The present application relates to the technical field of dual-mode communication, and an embodiment thereof provides a beacon frame optimization method, device and equipment under a dual-mode system. The dual-mode system adopts HPLC and HRF dual-mode networking, a beacon period of the beacon frame comprises adjacent beacon time slots and CSMA time slots, and an identification bit for identifying a boundary position of the beacon time slots and the CSMA time slots, wherein the beacon frame optimization method under the dual-mode system comprises the following steps: determining that a beacon frame on an HRF link needs to occupy the CSMA time slot for transmission; and updating the boundary position in the identification bit, so that the CSMA time slot starts the CSMA mode after the updated boundary position. The embodiment provided by the present application can improve the networking efficiency.

The embodiment of the application provides a communication method of a power line broadband carrier communication network and related equipment, and belongs to the technical field of power line communication. The method is executed by a CCO, network communication is carried out based on a superframe time slot structure of a beacon period; the CCO allocates a service identifier to a periodic reporting service of a node and sets a timer; when the timer reaches, the CCO allocates a special time slot to the service in a binding CSMA time slot area; for a temporary triggered service, the node uses random competition access in the CSMA time slot area; for the periodic reporting service, an adaptive channel access strategy is used: if a 136 byte physical block is used for a beacon signal, the node competes for access in the CSMA time slot area; if a 520 byte physical block is used, the node starts to send at the start time of the allocated special time slot, and all relay nodes directly forward without listening in the special time slot of the relay nodes, until the message is uploaded to the CCO, so that conflicts are avoided. The application effectively improves the efficiency and reliability of high-frequency data collection, is compatible with existing standards, and is easy to deploy.

A management device (100) manages a plurality of communication devices (110; 120; 130; 140; 150; 160; 170) in a communication system (10) that communicates according to a predetermined beacon period. The management device (100) includes a processor. The processor acquires, from each of the communication devices (110; 120; 130; 140; 150; 160; 170), transmission data information that is information including a data amount and a transmission priority relating to data to be transmitted in the next beacon period; determines, based on a plurality of pieces of the transmission data information acquired, a transmission data amount allowed for each of the communication devices (110; 120; 130; 140; 150; 160; 170) in the next beacon period; and notifies the communication devices (110; 120; 130; 140; 150; 160; 170) of the determined transmission data amount in the current beacon period.

The embodiment of the invention provides a communication method of a power line broadband carrier communication network and related equipment, and belongs to the technical field of power line communication. The method is executed by a CCO, and network communication is carried out based on a superframe time slot structure of a beacon period. The CCO allocates a service identifier for the periodic report service of the node and sets a timer; when timing arrives, the CCO allocates a special time slot for the service in a bound CSMA time slot area; for a temporary trigger service, the node adopts random competition access in a CSMA time slot area; for periodic reporting services, an adaptive channel access strategy is adopted: if a beacon signal uses a 136-byte physical block, a node competes for access in a CSMA time slot area; if a 520-byte physical block is used, the node starts to send at the starting moment of the allocated special time slot, and the relay node directly forwards the message in the special time slot of the relay node without monitoring until the message is uploaded to the CCO, so that conflicts are avoided. The method effectively improves the efficiency and reliability of high-frequency data acquisition, is compatible with the existing standard, and is easy to deploy.

The invention discloses a power line carrier streaming media data transmission method and a communication system, the method is executed by a main end device, and the method comprises the following steps: S1, broadcasting a beacon frame in a beacon time slot, the beacon frame comprising time slot division information for a current beacon period, the time slot division information defining a circulation unit, each cyclic unit comprises a downlink streaming media time division multiple access time slot, an uplink streaming media time division multiple access time slot and an emergency time slot; s2, in a downlink streaming media time division multiple access time slot, downlink streaming media data are sent to one or more slave end devices in a non-competitive mode; s3, receiving a time slot switching request from the slave end equipment, and authorizing the specific slave end equipment to use a specified downlink streaming media time division multiple access time slot according to the channel state; and S4, in the emergency time slot, emergency data from the slave end equipment or sent to the slave end equipment is received, so that efficient dynamic balance between the conventional high-speed streaming media service and the sudden emergency demand is realized.

The invention discloses a hybrid star topology-based wireless body area network dynamic resource management method, which comprises the following steps of: constructing a hybrid star topology framework comprising a main coordinator and an edge coordinator, classifying acquired physiological monitoring data through the main coordinator to correspond to A-type emergency data, B-type inspection data and C-type common data, and performing data processing on the classified data; a dynamic priority formula is designed for weighted calculation and real-time adjustment of a data transmission sequence, and it is preferentially guaranteed that the A-type emergency data preempts channel resources; when the channel utilization rate is gt; triggering migration evaluation and adopting a double-stage migration process when the class-A emergency data conflict exists at 80% and the class-A emergency data conflict exists; if the original channel utilization rate is lt; if 30%, automatically releasing to a global standby pool; transmitting power is adjusted in real time, a contention window is dynamically adjusted for channel conflicts of ABC three types of data, and PID parameter self-adaptive optimization is triggered after the conflicts continuously occur for three times; and the node is automatically switched to a low-power-consumption mode after data transmission is finished until the node is awakened in the next beacon period.

A system for transmitting primary and secondary data, the system comprising: a bus; a parent node coupled to the bus; and a plurality of child nodes each coupled to the bus, wherein: the parent node is configured to periodically transmit a time-domain multiplexing (TDM) periodic beacon to the bus, wherein the TDM periodic beacon signals the start of a primary data transmission interval, and wherein the primary data transmission interval is a period reserved for the transmission of primary data by the parent node and the plurality of child nodes; each of the parent node and the plurality of child nodes is operable to transmit primary data of a current TDM beacon period associated with the TDM periodic beacon to the bus during the primary data transmission interval in response to the TDM periodic beacon; and the parent node and the plurality of child nodes are operable to transmit secondary data to the bus during a secondary data transmission interval between the end of the primary transmission interval and the transmission of the next TDM periodic beacon by the parent node.

The present invention provides a TDMA time slot allocation algorithm applied to UWB. The base station uses P frame as a small cycle, and a G frame is composed of multiple P frames. The tag uses the G frame period as the working cycle. The duration of the P frame determines the number of time slots in TDMA and the period value of the G frame. The P frame includes two parts. The first part is the Alloc time slot allocation part, and the second part is the Work working part. The Alloc time slot allocation part consists of a Beacon period, L Join periods and an Idle period. The Work working part consists of M Work time slots. The number of time slots constituting Beacon, Join and Work is determined according to the UWB working rate of 110Kbps, 850Kpbs and 6.8Mbps, the preamble length of PHY and the time required for Work work, which needs to include the UWB wireless air transmission time and the CPU processing time required for the base station and the tag respectively. The Idle period occupies at least 2 T s The time unit is 2ms. The Alloc and Work parts each have an Idle period, and the Idle period adjusts the duration of the P frame.

The invention discloses a communication method and device of a broadband carrier communication network, electronic equipment and a storage medium, and belongs to the technical field of broadband carrier communication, and the method comprises the steps: distributing a corresponding first coding sequence for a proxy beacon sending node set, and segmenting a discovery beacon sending node; in the current beacon period, according to the first coding sequence, the node short addresses of all the proxy beacon sending nodes and the address pairs corresponding to all the discovery beacon sending node segments, corresponding beacon signaling is generated, and whole-network broadcasting is carried out; and if the proxy beacon sending node set does not change in a continuous first preset number of beacon periods, corresponding beacon signaling is directly generated according to the first coding sequence and the address pair in the next beacon period, and whole-network broadcasting is carried out, therefore, through the implementation of the method and the device, the service life of the proxy beacon sending node set is prolonged, and the service life of the proxy beacon sending node set is prolonged. The problem that in the prior art, when beacon signals are sent each time, node addresses of all nodes need to be carried, and the channel overhead is large can be solved.

The invention discloses an HPLC (High Performance Liquid Chromatography) communication fault detection method and device and a medium, relates to the technical field of power line carrier communication, and aims to improve the real-time performance and reliability of fault detection. The method comprises the following steps: in response to a fault detection signal, dividing a beacon period into a beacon time slot, a TDMA time slot, a CSMA time slot and a bound CSMA time slot; when it is detected that the TDMA time slot is in an enabled state, setting execution of a first service for the TDMA time slot; when it is detected that the bound CSMA time slot is in an enabled state, setting execution of a second service for the bound CSMA time slot; and judging a current communication fault according to execution results of the first service and the second service. The invention discloses an HPLC (High Performance Liquid Chromatography) communication fault detection device. The invention further discloses a computer readable storage medium which is used for executing the HPLC communication fault detection method. According to the HPLC communication fault detection method disclosed by the invention, the communication fault detection efficiency and accuracy can be improved.

The invention relates to the technical field of intelligent street lamps, and discloses a power management method and system applied to urban intelligent street lamps, and the method comprises the steps: obtaining the feature parameters of a target lamp post; based on the prior height of the lamp post, combining the transverse displacement of the lamp post and the torsion angle of the lamp post, and sequentially determining a polarization flip angle and additional attenuation; when the first event and the second event occur at the same time, triggering risk early warning; in response to risk early warning, calculating a randomization factor based on the maximum value of the polarization flip angle; randomizing the beacon period into a random period, and issuing randomization factors to all the lamp poles in the delimited signal coverage area according to the random period; in response to risk early warning, generating an equivalent control voltage by using prior cross polarization isolation, and adjusting a driving duty ratio by using the equivalent control voltage; and in response to risk early warning, judging that the lamp pole angular velocity of the target lamp pole is synchronous with the second-order torsional pendulum prior frequency, and performing energy complementation processing on the super capacitor of the target lamp pole.

Enabling secondary channel access during beacon and groupcast traffic and shortening the periods of beacon and groupcast traffic may be provided. Enabling secondary channel access can include advertising a capability to exchange traffic on secondary channels during beacon period. During a beacon period, beacons and groupcast traffic are transmitted on a primary channel and traffic is exchanged with the one or more clients on one or more secondary channels. Enabling secondary channel access between OBSSs can include one BSS transmitting beacons and groupcast traffic on a primary channel and another BSS exchanging traffic on secondary channels. Shortening beacon periods can include offsetting or otherwise organizing Delivery Traffic Indication Map (DTIM) beacons and groupcast traffic.

The invention provides a data acquisition method by utilizing TDMA (Time Division Multiple Access) time slots of a proxy node, which comprises the following steps: (1) a CCO judges that an acquisition task exists, time is started, the CCO starts to distribute the number and length of the TDMA time slots of a PCO (Policy Control Object) sub-network in a beacon period and sends a beacon frame, and when data acquisition of the acquisition task period is finished, the beacon frame does not carry the TDMA time slots of the PCO sub-network any more; 2) after the time slot starting time is reached according to the TDMA time slot of the sub-network divided by the CCO, the PCO starts an acquisition command and sends data to one STA, the STA responds to the acquired data, after the PCO receives the response data, whether a content carrying mark in a data frame has a subsequent report frame or not is judged, if the subsequent frame exists, the PCO continues to read the STA, if the subsequent frame does not exist, the PCO reads the next direct connection station STA, and if the subsequent frame does not exist, the PCO reads the next direct connection station STA; and continuously circulating until the data acquisition and receiving of all nodes are finished or the TDMA time slot of the sub-network is finished. The CCO calculates the number of sub-nodes of each PCO sub-node, the PCO hierarchy, the time required for data acquisition and the current beacon frame duration according to the network topology structure;