19 results about "Multicast message" patented technology

This invention discloses a method and system for rapid vehicle location tracking via door locks. The method includes: configuring topology information containing neighboring door lock addresses for each unit door lock based on a preset community access topology map; the resident door lock sending an IGMP join message to a preset multicast address; generating a discovery message based on the first detection of a Bluetooth tag signal by the unit door lock, and forwarding it to predicted neighbors via unicast according to the neighbor topology; the unit door lock receiving the discovery message switching its Bluetooth detection mode from low frequency to high frequency, forming a relay detection chain along the predicted path; and, based on the condition that the tag's signal strength remains stable near a certain unit door lock, generating a formal announcement multicast message, which is then forwarded by a router to the corresponding resident door lock, completing the vehicle location push. Using this invention, rapid, accurate, and low-power vehicle Bluetooth tag location can be achieved, improving the location response speed and system coordination efficiency in a community environment.

A multicast packet transmission method and an apparatus are disclosed, and relate to the field of communication technologies. In the method, a first node may send, to a second node, first multicast routing information that includes multicast routing information of the second node and multicast routing information of a third node, and first positioning information that is for determining the multicast routing information of the second node. In this way, after receiving the first multicast routing information and the first positioning information, the second node determines, based on the first positioning information, the multicast routing information of the second node from the first multicast routing information. In this application, the first node does not need to split the first multicast routing information for the second node, to obtain the multicast routing information of the second node. In this way, a quantity of times of splitting and editing a multicast packet is reduced, and multicast packet forwarding efficiency is improved.

This invention discloses a method and system for collaborative vehicle location using door lock tags. The method includes: sending an IGMP join message carrying a building identifier from a unit door lock, and recording the door lock's interface information and associated tag information in the router's multicast forwarding table; writing its own door lock identifier to a vehicle's Bluetooth tag after the unit door lock detects it, and determining that the vehicle has stopped when this set remains unchanged for several consecutive periods; actively scanning surrounding Bluetooth devices after the vehicle stops, and reporting stopping information including its own identifier and the list to the unit door lock with the strongest signal; and performing interface matching processing on other Bluetooth identifiers in the multicast message carrying an official announcement identifier generated by the received unit door lock to trigger confirmation feedback. Using this invention, accurate collaborative location between vehicle tags and resident door locks can be achieved, improving the accuracy and real-time performance of vehicle parking detection in complex environments.

This invention provides a VLAN multicast-based system and method for synchronous projection of left and right vehicle lights, relating to the fields of automotive intelligent lighting and in-vehicle communication technology. The system includes a video source, an in-vehicle Ethernet switching device, left / right area controllers, and left / right high-definition vehicle light controllers. The video source generates a single UDP multicast message containing left and right vehicle light pattern data and sends it to a preset multicast address. The in-vehicle Ethernet switching device performs hardware-level replication and forwarding of the message within an independent lighting service VLAN, enabling the left and right high-definition vehicle light controllers to receive the same message instance. Both controllers parse and extract the corresponding light pattern data and synchronously complete the light pattern refresh. This invention eliminates the time difference at the sending end of traditional UDP unicast, reduces network latency jitter through VLAN isolation, and eliminates the need for additional synchronization harnesses, time synchronization protocols, or CAN trigger signals. This limits the refresh time difference between the left and right vehicle lights to within one display cycle, achieving visually error-free synchronization.

The application provides a data processing method and device and electronic equipment. The method is applied to a target gateway, which is any gateway in a preset multicast group. The method comprises the following steps: in the case that a first current state of a first device is acquired, determining a first record item indicating the first device in a local record set, updating first record content associated with the first record item based on the first current state, and marking the first record item with a first record state; sending a first multicast message indicating the first current state to at least one same-group gateway, so that the at least one same-group gateway respectively updates the device state based on the first multicast message, and the at least one same-group gateway is composed of remaining gateways in the preset multicast group except the target gateway; and in the case that a message response returned by each of the at least one same-group gateway is received, marking the first record item with a second record state. The application provides a more efficient and accurate device state synchronization scheme.

This invention discloses a method and system for secure communication between a door lock and a mobile terminal. The method includes: periodically collecting the Bluetooth signal strength of mobile terminals within the coverage area of ​​a unit door lock, dividing the signal strength into preset levels and generating corresponding connection states, then encapsulating these into IGMP join messages and sending them to a specific multicast address; upon receiving the IGMP join message, the door lock gateway registers or refreshes the unit door lock IP, connection state, and local forwarding interface corresponding to the Bluetooth address in its maintained Bluetooth address binding table; based on a voice call request initiated by an indoor extension, constructing a multicast message, forwarding it via a router network, and having the aggregation point RP transmit it in reverse along the established (S,G) table entry path according to the (S,G) multicast tree. Using this invention, a fast, accurate, and secure direct session can be established between the door lock and the mobile terminal, reducing communication latency and dependence on external networks.

This invention provides a high-precision synchronization and dynamic reconstruction control method and system for time synchronization signals, belonging to the field of time synchronization technology. The invention receives external time synchronization signals and performs level conversion and validity judgment. For valid / invalid scenarios, a weighted fusion algorithm / internal clock self-excitation is used to generate a master time base signal, improving synchronization reliability and accuracy. Based on the master time base signal, a precise timestamp is generated and periodically distributed via multicast messages. Combined with local clock closed-loop compensation and precise delay measurement on the service board, transmission delay is reduced, delay errors are eliminated, and the board and master time base are precisely aligned. The system monitors the time synchronization input source and VPX slot board status in real time, switching to a backup source and recalculating the fusion algorithm for failure scenarios, and dynamically loading time synchronization service logic for hot-swappable devices to achieve dynamic system reconstruction. Finally, a distributed output signal is generated after level conversion and distributed to the terminal, achieving high-precision synchronization and stable and reliable distribution of time synchronization signals under the VPX architecture.

This invention discloses a waveform recording method, apparatus, electronic device, and storage medium based on UDP multicast, to solve the problems of low communication efficiency, poor synchronization, and poor coordination in current smart substation waveform recording. Applied to a smart substation, the method involves multiple waveform acquisition units joined to a specified multicast address; acquiring the smart substation's SCD file and generating station-wide waveform recording mapping information accordingly; for any first waveform acquisition unit that initiates waveform recording, generating linked waveform recording information based on the station-wide waveform recording mapping information and sending it via multicast message; for each second waveform acquisition unit that receives the multicast message, if it is determined based on the multicast message that it meets the waveform recording initiation conditions, then initiating waveform recording and synchronously generating waveform recording files according to the multicast message; grouping all waveform recording files to obtain multiple waveform recording file groups; and performing waveform time stamp and boundary alignment on each waveform recording file group before merging the waveforms to obtain the station-wide waveform recording file.

The present disclosure relates to controlling a group of electrical loads. A load control system can include a control device for controlling an electrical load. The control device can include a load control device, such as a lighting device for controlling an amount of power provided to a lighting load, and a controller device, such as a remote control device configured to send digital messages for controlling the lighting load via the load control device. The remote control device can communicate with the lighting device via a hub device. The remote control device can detect a user interface event, such as a button press or rotation of the remote control device. The remote control device or the hub device can determine whether to send a digital message as a unicast message or a multicast message based on a type of the detected user interface event. The remote control device or other master device can synchronize and / or toggle on / off states of lighting devices in the load control system.

The application discloses a multicast communication security guarantee method, comprising the following steps: a multicast sender periodically sends multicast messages; after a receiver receives the multicast messages, if there is no security check requirement for the received information, the receiver directly uses a security code to check the message integrity, directly uses the message after checking the message disorder, deletion and repetition according to a time stamp and a serial number; and if there is a security check requirement for the received information, the receiver performs security check, including verifying a security signature by using a pre-configured encryption algorithm and key, checking the message integrity, disorder, deletion and repetition, and performing delay check. The application can save communication bandwidth, reduce the number of links and simplify link management based on multicast mechanism transmission of security information.

The application provides a gateway dynamic switching method and system and a storage medium. The method comprises the following steps: after a gateway device joins a dynamic multicast group, a multicast message and a discovery packet are sent; when the gateway device receives the discovery packet, the multicast server and the multicast client are determined according to the discovery packet, the multicast client is controlled to initiate a transmission control connection to the multicast server, key exchange is performed, an encryption key is obtained, and gateway login is performed according to the encryption key; after the multicast client and the multicast server are successfully logged in, link communication is performed, link quality of the multicast server and the multicast client is detected, and link path switching of the multicast server and the multicast client is performed according to the link quality detection result. According to the embodiment of the application, the link communication is automatically controlled, the link path switching of the multicast server and the multicast client is automatically performed based on the link quality detection result, and the user experience is improved.

The application discloses a multicast communication method applied to a multicast communication system, wherein the multicast communication system comprises a multicast source and at least one client, such as a first client; the method comprises the following steps: the multicast source determines a multicast address and a multicast key; the multicast source sends a first Bluetooth message to the first client, wherein the message comprises the multicast address and the multicast key; the first client sends a second Bluetooth message to the multicast source to indicate that the first client confirms to join a multicast group; the first client configures a source address corresponding to the multicast key as a MAC address of the multicast source; the multicast source sends a first multicast message encrypted by the multicast key through WiFi multicast, wherein a source address in a MAC header of the first multicast message is the MAC address of the multicast source, and a destination address is the multicast address; the first client listens to the first multicast message based on the multicast address; and the first client parses the first multicast message by using the multicast key. Thus, large-scale multicast transmission without WiFi connection can be realized.

Embodiments of the present application provide a power distribution automation communication solution method and device, computer equipment and a storage medium, the method comprising: a first power distribution equipment sends a GOOSE message of the first power distribution equipment to a first SD-WAN terminal equipment corresponding to the first power distribution equipment, wherein the first power distribution equipment is a power distribution equipment that has failed; the first SD-WAN terminal equipment forwards the GOOSE message after encapsulation to an SD-WAN center to obtain a GOOSE upload message; the SD-WAN center analyzes the GOOSE upload message to generate a GOOSE multicast message; the SD-WAN center multicasts the GOOSE multicast message to a plurality of target SD-WAN terminal equipments belonging to the same network to obtain a GOOSE multicast encapsulation message; the target SD-WAN terminal equipment sends an analysis message after the GOOSE multicast encapsulation message is analyzed to a target power distribution equipment belonging to the target SD-WAN terminal equipment; and the target power distribution equipment makes a protective response measure according to the indication of the analysis message. The reliability and quality of power supply are ensured, and the area where the intelligent distributed function is to be implemented is fully covered.

This invention provides a distributed IoT system with fiber optic networking and its device registration method. The system includes a host computer, a switch, and IoT terminal devices. The switch is connected to the host computer. Each IoT terminal device is equipped with two fiber optic interfaces. The IoT terminal devices are connected to the backbone network in a daisy-chain manner through the fiber optic interfaces, enabling bidirectional data communication along the cascaded path of the IoT terminal devices. Each device joins a unified multicast via a distributed soft bus component. The host computer sends multicast messages to all IoT terminal devices in the system via the CoAP protocol or sends messages to specific IoT terminal devices based on their IP addresses. The IoT terminal devices identify the destination address carried in the messages and parse and respond to messages whose destination address is their own IP address or the multicast address. This invention uses a daisy-chain fiber optic connection to form a mesh network system between the terminals and the host computer system, allowing each node to communicate with each other at high speed and low latency.

This invention discloses a method and system for reserving home appliances via a door lock. The method includes: constructing a multicast forwarding path from the door lock to the access control unit (RP) based on an IGMP join message carrying a member's facial feature vector sent by the door lock device; collecting the member's facial feature vector and generating a multicast home appliance reservation message based on the member's home appliance selection command on the access control device; matching the mapping relationship between the locally registered facial feature vector and the door lock's unicast IP address based on the access control gateway router's identification of the message as a multicast home appliance reservation message; and converting the multicast message into a unicast message based on the matching result, and sending the unicast message to the corresponding door lock device along the optimal path. The door lock device then parses the home appliance identifier and activates the corresponding home appliance via internal wireless communication. Using this invention, the targeted and efficient transmission of home appliance reservation commands after access control is triggered can be achieved, improving the accuracy and scalability of home appliance control in multi-user scenarios.

Aspects of the present disclosure relate to distributed transactions over a broadcast communication channel within a microservices environment. In embodiments, a method includes: receiving a request to process distributed transactions input in a data schema in order to perform a task of an application in a cloud computing environment; broadcasting to a plurality of microservices a multicast message requesting availability to execute the distributed transactions in the data schema; receiving confirmation of preparation from at least one of the plurality of microservices to execute one or more of the distributed transactions in the data schema; sending at least one unicast message to the at least one of the of the plurality of microservices to execute the one or more of the distributed transactions in the data schema; and receiving an acknowledgement of the execution of each of the distributed transactions in the data schema.

Provided is a message encapsulation and de-encapsulation method and device, a storage medium, and an electronic device. The message encapsulation method includes: encapsulating a bit indexed explicit replication (BIER) header in an IPv6 extended header of an IPv6 message in combination with a generic fragmentation header (GFH), a generic encapsulating security payload (GESP), or a generic authentication header (GAH). The problem in the related art of how to combine a GFH mechanism with a BIER header encapsulated in an IPv6 extended header can be solved; when the BIER header is encapsulated in the IPv6 extended header, the BIER header can be combined with the GFH / GESP / GAH, thereby simply and efficiently realizing fragmentation, encapsulating security and authentication functions of a BIER multicast message.

The application discloses an on-chip network and a multicast message transmission method, and belongs to the chip technical field.The on-chip network comprises at least one first processing unit and at least one multicast group;the first processing unit comprises sequentially connected first nodes, an adapter and a first router;the multicast group comprises a multicast network, a second processing unit and at least one third processing unit, the second processing unit comprises sequentially connected second nodes, the adapter and a second router, the third processing unit comprises sequentially connected second nodes, the adapter and the first router, and the second nodes and the second router are connected with the multicast network respectively;the first router and the second router are connected through a link; and the second router is used for forwarding the multicast message forwarded by the first router to the multicast network.The application can design the on-chip network based on an artificial intelligence algorithm, realizes the purpose of multicasting the message from a source node to target nodes in the multicast group, can simplify the algorithm, and reduces the cost.