99 results about "Multicast communication" patented technology

The invention relates to the technical field of cooperative control, in particular to a multi-compartment NVR (Network Video Recorder) state reporting and cooperative control system based on multicast communication, which comprises a state sensing aggregation module, a communication load evaluation module, a cache scheduling release module, a synchronous boundary correction module and a cooperative control configuration module. According to the invention, the node group in the frequently activated state can be identified through the normalization quantization processing of the starting frequency of the video channel in the carriage, the reading of the temperature sensor and the writing rate of the hard disk, and the load evaluation is carried out by combining the message data volume and the channel transmission capability of the node in the historical multicast period. A conflict early warning mark can be formed before a state conflict occurs, correction of time migration among multiple nodes is completed based on comparison of a node receiving timestamp difference value and a clock synchronization tolerance, a control instruction set for time alignment is constructed based on a unified time correction result, a trigger control task is broadcast and executed in a time window packaging mode, and the time correction efficiency is improved. And the communication resource use efficiency is improved.

The invention discloses a door lock collaborative identity recognition method and system, and the method comprises the steps: obtaining a locally stored MAC-face binding relation table according to face recognition verification completed by a resident through an intelligent door lock; according to the moving path of the resident from the floor entrance to the home door lock, identity recognition is completed through cooperation of multicast communication and the home door lock, an identity confirmation result is obtained, and a directional multicast network is constructed; according to a leaving event that a resident opens a door lock from a room, triggering a passing door lock to collect leaving person information, and obtaining a leaving person identity confirmation result; and selecting to send a unicast or multicast confirmation message by the own door lock according to the completion degree of identity confirmation of the leaving person, and triggering the passing door lock to send an IGMP leaving message to the router to obtain a simplified multicast forwarding table. According to the embodiment of the invention, seamless identity cooperation of the whole process from home returning to home leaving can be realized, and the automation degree of home security and protection and the user experience are improved.

A radio access network (RAN) participating in a multicast and broadcast services (MBS) session can implement a method for managing MBS communication. The method includes: (a) transmitting, to a user equipment (UE), a first command to transition from a connected state to an inactive state in which a radio connection between the UE and the RAN is suspended, the command including a first multicast configuration with an MBS radio bearer (MRB) parameter, for receiving MBS data; (b) transmitting, to the UE operating in the inactive state, MBS data according to the first multicast configuration; (c) receiving, from the UE, a request to resume the radio connection; and (d) transmitting, to the UE and in response to the request, a second command to resume the radio connection, the command including a second multicast configuration for continuing to receive the MBS data in the connected state.

A radio access network. RAN, participating in a multicast and broadcast services. MBS, session can implement a method for managing MBS communication. The method includes: transmitting (702), to a first UE operating in a connected state, a first multicast configuration for receiving MBS data in the inactive state: transmitting (703), to a second UE operating in the connected state, a second multicast configuration for receiving the MBS data in the connected state; and transmitting (708) the MBS data to the first UE operating in the inactive state, according to the first multicast configuration and the second UE operating in the connected state, according to the second multicast configuration.

The invention discloses a door lock cooperative voice transmission method and system, and the method comprises the steps: triggering a voice call connection process according to a voice call connection between a Bluetooth tag device carried by a mobile user and an initial door lock; according to a user face image captured by a door lock along the way through a camera and a Bluetooth label signal, the advancing direction of a user is recognized, and the door lock in the advancing direction is informed to enter a continuous preparation state through multicast communication; according to connection requests of a plurality of opposite users received by a middle door lock, when a path conflict is detected, re-planning a connection path of at least one user; and according to the coordination result, switching the connection path of the coordinated user to the door lock of the opposite door or the jumping door lock, and completing stable handover of the voice call when the user arrives at a new connection door lock. By utilizing the embodiment of the invention, seamless and stable connection of voice communication among a plurality of door locks can be realized, path conflicts are avoided, and the communication continuity and experience of a user in a mobile scene are improved.

The invention provides a wireless communication method based on a cellular Internet of Vehicles technology, a communication terminal and a vehicle, and relates to the technical field of vehicle communication. The method comprises the following steps: adding a first vehicle-mounted communication terminal and a second vehicle-mounted communication terminal of a target following vehicle in preset formation vehicles to a communication network of a target multicast group, and generating a target multicast routing table, so that a leading vehicle adopts a multicast communication mode, the multicast data can be sent to the second vehicle-mounted communication terminal of each target following vehicle in a targeted manner through the first vehicle-mounted communication terminal, so that the data is prevented from being sent to other vehicles. Due to the adoption of the multicast communication mode, the vehicle-mounted communication terminal of any vehicle in the target multicast group sends the multicast data, and the vehicle-mounted communication terminals of the other vehicles can receive the multicast data, so that unnecessary repeated transmission is avoided, the risk of network congestion is remarkably reduced, the information spreading efficiency is improved, and the user experience is improved. And meanwhile, all target following vehicles can receive the latest instruction in time, and synchronization and stability of a motorcade are maintained.

The invention discloses an emergency method and system based on door lock Bluetooth collaboration, and the method comprises the steps: detecting a floor network fault according to a monitoring result of a robot dog on a door lock multicast communication state, triggering the robot dog to carry out autonomous task distribution or platform scheduling distribution, and determining a floor which each robot dog is responsible for; according to the event that the robot dog arrives at the designated floor, Bluetooth communication links are sequentially established between the adjacent door locks according to a preset evacuation path, and relay alarm message transmission between the door locks is achieved through the IP forwarding function of the robot dog; according to the relay alarm message transmitted by the door lock in the Bluetooth link, each door lock whistles and alarms according to a planned time point, and synchronously reports personnel statistical information; and according to the door lock fault condition detected by the robot dog, the emergency pointing link is updated in a dominant skipping or autonomous identification mode. According to the embodiment of the invention, the intelligent level and rescue efficiency of building emergency response can be improved.

A communication method used in a mobile communication system for providing a multicast / broadcast service (MBS) includes: providing, by a base station, two types of multicast control channels (MCCHs) being a first MCCH for a broadcast communication service and a second MCCH for a multicast communication service; and transmitting, by the base station to a user equipment, mapping information indicating a correspondence relationship between an MBS session identifier of an MBS session and a type of the MCCH for transmitting a Point-to-Multipoint (PTM) configuration corresponding to the MBS session.

The embodiment of the disclosure discloses a multicast communication method and device, which can be applied to a vehicle-to-everything (V2X) system, a vehicle-to-vehicle (V2V) system, etc. The method comprises the following steps: a first terminal device determines a hybrid automatic repeat request (HARQ) feedback mode selected by the first terminal device; and the first terminal device determines whether to retransmit multicast data according to the HARQ feedback mode selected by the first terminal device. Through the embodiment of the disclosure, multicast communication in a Sindlink-U scenario can be realized, multicast data integrity in the Sindlink-U scenario is ensured, and the problem of packet loss of terminal devices in a group is solved.

Communication techniques (e.g., IP-based communications, multicast communications, unicast communications, wireless communications, etc.) are described. Devices may establish discrete communication sessions, with defined start and end times determined at the network layer of an Open Systems Interconnection (OSI) model, to exchange content.

The application provides a transmission method and a communication device of a channel state parameter. The method comprises the following steps: a first terminal device receives first indication information from a communication device, wherein the first indication information is used for indicating a first channel state parameter, the first channel state parameter is a minimum value of channel state parameters corresponding to a first multicast group, the first multicast group comprises a plurality of terminal devices receiving the same multicast information, and the plurality of terminal devices comprise the first terminal device; the first terminal device measures a reference signal from the communication device to obtain a second channel state parameter; and if the second channel state parameter is smaller than the first channel state parameter, the first terminal device sends second indication information to the communication device, wherein the second indication information is used for indicating the second channel state parameter. The reliability of multicast communication is improved.

Methods and apparatus are provided for data transmission. A remote device determines a sidelink multicast identifier identifying multicast between the remote device and a plurality of relay devices and sends uplink data to the plurality of relay devices in a multicast manner based on the sidelink multicast identifier. The uplink data is data sent by the remote device to a radio access network device. The remote device determines the sidelink multicast identifier, and sends the sidelink multicast identifier to the relay device to transmit the uplink data to the radio access network device based on multicast communication to improve uplink data transmission efficiency.

The application discloses a D2D communication multicast method based on equal-angle clustering and adaptive bandwidth allocation. The terminal of a D2D multicast communication system under a cellular network comprises a D2D transmitting terminal (cluster head) and a D2D receiving terminal, wherein the D2D transmitting terminal comprises S D2D transmitting users and the D2D receiving terminal comprises R D2D receiving users. The method comprises the following steps: solving the communication distance and the number of clusters under the base station which make the system time delay minimum according to a brute force search algorithm; clustering the users through the equal-angle clustering algorithm of the application and selecting the optimal cluster head according to the distance, and the cluster head obtains data from the base station; and the cluster head distributes the data to the users in the cluster which can establish D2D reliable communication through the D2D multicast mode, wherein the cluster head performs bandwidth allocation according to the optimal solution obtained through the proportional bandwidth allocation algorithm of the application. The application can efficiently utilize the spectrum resource of the cellular network and effectively reduce the transmission time delay of the multicast communication.

A communication apparatus, a communication method, and a storage medium are disclosed. When a communication apparatus transmits a frame through a multicast communication or a broadcast communication in a state where a connection with one or more other communication apparatuses has been established through a plurality of frequency channels, the communication apparatus determines a frequency channel for transmitting the frame based on whether the one or more other communication apparatuses are operating in a power save state in the plurality of frequency channels, and transmits the frame through the determined frequency channel.

The application discloses a door lock cooperative voice transmission method and system, the method comprising: triggering a voice call connection process according to a voice call connection between a Bluetooth tag device carried by a mobile user and an initial door lock; identifying a user travel direction according to a user face image captured by a camera of a door lock along the way and a Bluetooth tag signal, and informing the door lock in the forward direction to enter a connection preparation state through multicast communication; when detecting a path conflict according to a connection request of multiple opposite users received by an intermediate door lock, re-planning a connection path of at least one of the users; switching the connection path of the coordinated user to a door-to-door door lock or a separate door lock according to the coordination result, and completing a smooth handover of the voice call when the user arrives at the new connection door lock. By using the embodiment of the application, seamless and stable connection of the voice call between multiple door locks can be realized, path conflicts can be avoided, and the communication continuity and experience of the user in a mobile scenario are improved.

A base station may transmit a broadcast / multicast service in a multicast broadcast single frequency network (MBSFN) area multicast communication. A method of wireless communication at a base station in accordance with an aspect of the present disclosure comprises determining a broadcast / multicast service to be provided to a user equipment (UE) in a multicast broadcast single frequency network (MBSFN) area, and transmitting a tracking reference signal (TRS) to the UE, the TRS indicating information associated with receiving the broadcast / multicast service by the UE.

Systems, methods, apparatuses, and computer program products for zero-copy symmetric multicast communication buffers for offload operations. A method may include receiving an instruction for performing a collective operation across a plurality of processing elements. The method may also include determining an offset of the first virtual address from a first base address associated with the first set of contiguous virtual addresses. The method may further include translating the first virtual address to a corresponding multicast virtual address based on the offset. Further, the method may include causing the collective operation to be performed based at least on the multicast virtual address.

Approaches are described for a decentralized computing platform that enables dynamic execution of distributed services through a hybrid on-chain and off-chain architecture. The platform consists of a network of nodes, each running a virtual machine to host and execute service instances. A sequencer component records, sequences, and notarizes function calls to maintain a consistent service-level state across the network. Computation takes place off-chain on nodes that participate dynamically in specific services based on resource availability. A persistent virtual memory structure manages both service-level and instance-level state. The service-level state is synchronized across nodes participating in the same service, while the instance-level state is isolated to individual nodes for independent operations. The memory system is non-volatile, retaining state across function calls and enabling direct execution from memory. A universal procedure call (UPC) framework facilitates decentralized communication through multicast-enabled operations with customizable fault tolerance and supports applications from finance to high-performance computing.

A method for multicast communication, a first network device, and a second network device. The method includes: a first network device sends first information to a second network device, where the first information indicates an association relationship between multicast service information and a first terminal device; the first network device receives second information from the second network device; the first network device generates a configuration message based on the second information, where the configuration message indicates an association relationship between the multicast service information and a first logical channel, and the first logical channel is a logical channel of the first terminal device; and the first network device sends the configuration message to the first terminal device.

Optimizing network load in multicast communications including receiving, at a first interface of a first router from a second router, a multicast packet for a multicast group; determining whether a time to live (TTL) value of the multicast packet is equal to zero; and sending, in response to determining that the TTL value of the multicast packet is equal to zero, a Protocol Independent Multicast prune message on the first interface of the first router, wherein the Protocol Independent Multicast prune message comprises a request to stop receiving multicast traffic for the multicast group.

The invention relates to the technical field of communication, and discloses a multicast communication method and system based on a three-dimensional geographic position and electronic equipment, and the method comprises the steps: obtaining the three-dimensional geographic position of a target area; generating a space identifier of the target area based on the three-dimensional geographic position; performing service query based on the space identifier to obtain a mapping relation corresponding to the target area; performing routing addressing on the target area based on the mapping relation to generate a flow table; generating a multicast communication message based on the space identifier, and sending the multicast communication message to all receiving terminals in the target area according to a flow table; and screening effective terminals from all the receiving terminals based on the multicast communication message, so that each effective terminal receives and processes the multicast communication message. According to the method, the space identifier is generated through the three-dimensional geographic position, the precision limitation of a traditional mapping relation and the limitation of two-dimensional plane communication are broken through, finer communication granularity is achieved, three-dimensional space representation is supported, and multicast errors, omission and range generalization are avoided.

This invention relates to a system and method for intelligent software upgrade deployment, belonging to the field of distributed system technology. The software upgrade scheme provided by this invention adopts a P2P network download mode, which can quickly distribute software upgrade packages. Furthermore, the more nodes simultaneously being upgraded in the distributed system, the faster the software upgrade package distribution speed. Compared to multicast mode, which can also distribute data, P2P does not require network devices to support special functions, while multicast functionality requires network device support; otherwise, multicast communication cannot be achieved. In addition, this invention supports automated online and offline upgrade operations, which is convenient, fast, and reduces the probability of erroneous operations.

Presented herein are techniques to address a lack of path maximum transmission unit discovery in the context of, e.g., the control and provisioning of wireless access point (CAPWAP) protocol for multicast communications. In one embodiment, IPv4-IPv6-IPv4 network address translation is used to avoid a conservative maximum transmission unit size. In another embodiment, unicast and multicast path maximum transmission unit discovery techniques are executed to set the maximum transmission unit size for multicast communications.

The invention provides a card-free hotel door lock processing method and system and a storage medium. A second user door card RFID is read through a first user room door lock according to a triggered card-free mode, and a door lock verification subscription multicast message is sent to a multicast router; the multicast router verifies and subscribes the multicast message according to the door lock and establishes a multicast forwarding table item; the second user room door lock sends a door lock no-card verification multicast message to a preset multicast group address according to the no-card assistance verification message; and the multicast router analyzes the multicast group address and the RFID field according to the door lock no-card verification multicast message, matches the multicast forwarding table entry, and executes opening of the first user room door lock. Compared with the prior art, the method has the advantages that verification is assisted by a third-party user, cross-door-lock distributed verification is achieved through a multicast communication mechanism, unlocking is completed through dynamic face recognition and RFID information matching, participation of a management platform is not needed, and the service pressure of the management platform is reduced.

Methods, apparatus, systems and procedures to manage a multicast communication to a multicast group implemented by a respective wireless transmit / receive unit (WTRU) of WTRUs in the multicast group are disclosed. One representative method includes receiving, by the respective WTRU of the multicast group, a configuration, the configuration indicating a Random Access Channel (RACH) preamble to use for a negative acknowledgement (NACK) response to a multicast transmission to the respective WTRU, monitoring, by the respective WTRU, for data of the multicast transmission, determining, by the respective WTRU, whether the monitored for data was successfully received; and on condition that the monitored for data was not successfully received, sending, by the respective WTRU, the RACH preamble indicated by the received configuration.

Methods and systems describe multicasting the messages over a broadcast medium (e.g., a TV network). In particular, the methods and systems recite the use of Advanced Television Systems Committee (“ATSC”) 3.0, a new broadcast television transmission standard in the United States. Using ATSC 3.0, the methods and systems can disseminate messages to all the electrical equipment.

A communication method performed by a user equipment in a mobile communication system that provides a multicast / broadcast service (MBS) includes receiving a first PTM configuration from a network, the first PTM configuration being used for reception of a multicast session in a Radio Resource Control (RRC) inactive state, and holding the first PTM configuration, determining, in the RRC inactive state, whether the first PTM configuration needs to be updated in response to reception of a paging message from the network, the paging message including a session identifier of the multicast session, and acquiring, in the RRC inactive state, a second PTM configuration used for reception of the multicast session by receiving a multicast control channel (MCCH) for multicast communication in response to determination that the first PTM configuration needs to be updated.

The application discloses a kind of robot multimodal data intelligent transmission method and system, method includes: according to the event that robot accesses network under any broadcast network environment, by access gateway record multicast forwarding table item containing robot attribute information;According to the notification message sent by initiator robot to multicast communication group, carry target robot type, by multicast router robot attribute and target type in notification message are matched;According to the response message returned by target robot, determine unique target robot;According to the consistency judgment result of initiator robot and target robot access gateway, reaccess target robot gateway;According to the state that both sides are in same layer 2 network domain, directional data transmission not dependent on IP address is realized by exchange equipment.Utilize the embodiment of the application, the real-time and reliability of multi-robot collaborative system can be improved.

A radio access network (RAN) participating in a multicast and broadcast services (MBS) session can implement a method for managing MBS communication. The method includes: (a) performing (i) a unicast communication and (ii) a multicast communication with a UE operating in a connected state; (b) in response to determining data inactivity for the unicast communication, transmitting a message indicating that the UE is to transition from the connected state to an inactive state in which a radio connection between the UE and the RAN is suspended; and (c) continuing to perform the multicast communication with the UE operating in the inactive state.