14 results about "Beacon period" patented technology

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 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.

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.

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 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 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.

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;