144 results about "Multicast communication" patented technology

A disclosure of the present specification provides a method for performing multicast-related communication by an SMF. The method may comprise the steps of: receiving, from a UE, a join request message for requesting participation in multicast communication; transmitting, to an AMF node, an allocation request message for requesting allocation of an EBI to a unicast QoS flow corresponding to a multicast QoS flow related to the multicast communication; and receiving information of the EBI allocated to the unicast QoS flow from the AMF node.

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.

The invention discloses a Modbus protocol security enhancement method in a multicast communication scene, which comprises the following steps: when a master node initiates an identity authentication request, the master node calculates a first message authentication code of a first random number according to a session key; wherein the session key is obtained according to random numbers pre-generated by the master node and the slave node; broadcasting and sending the encrypted session key and the first message authentication code to each slave node; the slave node decrypts the encrypted session key, and calculates a second message authentication code of the first random number according to the obtained session key; when the message authentication codes are the same, authenticating the identity of the main node; the slave node calculates a third message authentication code of the second random number by using the session key, and sends the third message authentication code to the master node; the main node uses the session key to calculate and obtain a fourth message authentication code of each second random number; and when the message authentication codes are the same, authenticating the identity of the corresponding slave node. According to the invention, the identity verification efficiency is improved, and the safety and reliability 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.

The invention relates to a rapid clock synchronization system and method based on a virtualization technology. The system comprises a secure clock virtual machine STVM, a working virtual machine VM, a clock card and a TSN switch. The STVM is directly connected with a clock card through a virtualization technology to generate a unique clock; the TSN switch establishes a multicast communication network of a secure clock virtual machine STVM and each working virtual machine VM, and is used for transmitting a clock synchronization message of a set period; the STVM sends a clock synchronization message with a corresponding cycle length to each multicast network; and the working virtual machine VM creates a periodic clock synchronization receiving task and receives a clock synchronization signal with a period length. Compared with the prior art, the clock synchronization method has the advantages that the clock synchronization process is simplified, fast and periodic clock synchronization is realized, and meanwhile, the clock synchronization precision is improved.

A user equipment (UE) can implement a method for reporting feedback for a multicast and / or broadcast service (MBS) when the UE is receiving multiple MBSs. The method may include receiving (402), during a time period when a base station generates a sequence of downlink assignments for the multiple MBSs, a plurality of downlink assignments included in the sequence of the downlink assignments, the plurality of downlink assignments scheduling a respective plurality of data transmissions of the MBS service; attempting to receive (404), from the base station, the plurality of data transmissions in accordance with the plurality of downlink assignments; and transmits (406), to the base station, feedback for the plurality of data transmissions, the feedback including an indication of a last successfully received downlink assignment of the plurality of downlink assignments.

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.

A multicast communication method in a hybrid cloud environment includes a control platform that obtains, from a multicast configuration interface, multicast member information for the gateway or a selection of enabling, for the gateway, a function of performing learning based on a layer 2 dynamic multicast protocol that is input by a tenant; the control platform configures the gateway based on the foregoing descriptions; when the multicast member information is input, the control platform configures the gateway to record a correspondence between a multicast group and a multicast member.

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.

Disclosed is a method for implementing an intra-cloud and inter-cloud multicast function by virtual instances in a public cloud. The present invention mainly solves the issue of supporting a multicast in virtual instances of a public cloud user in a VPC or between VPCs, and also solves the issue of multicast communication between a user offline IDC and cloud-based virtual instances. When multicast members are added to a multicast group, the functions of the cloud-based virtual instances statically adding / leaving the multicast group and dynamically adding / leaving the multicast group by means of an IGMP protocol are supported, so that a cloud-based customer can use a multicast technology service in a service having a multicast requirement, providing the customer with a multicast service having low latency, fast access, and no packet loss. The method is applicable to various fields and live streaming services. The multicast is supported in a virtual network without changing a switch and a router on a computing node of a data center.

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 present invention provides a communication device, a communication method, and a storage medium. A communication device includes: a establishing unit configured to establish a first connection between the communication device and a first other communication device via one or more links using one or more frequency channels, and establish a second connection between the communication device and a second other communication device via one or more links using one or more frequency channels; a determining unit configured to determine a frequency channel required for a frame transmitted in multicast communication or broadcast communication to reach the first other communication device and the second other communication device, wherein the frequency channel is determined among a plurality of frequency channels used in the links of the first and second connections established by the establishing unit; and a transmitting unit configured to transmit a frame on the frequency channel determined by the determining unit.

The invention discloses a service performance evaluation method based on 5GLAN static multicast communication, and relates to the technical field of communication, and the method comprises the steps: monitoring the data distribution condition of a router to students in a static multicast group in real time through a preset route monitoring tool, recognizing the students with normal and abnormal data distribution, and carrying out the evaluation of the service performance of the static multicast communication. Recording and summarizing data distribution conditions in an evaluation period, and calculating and displaying a data distribution success rate; the original frame number and the sending starting time of the video data sent by the teacher are obtained, and the receiving starting time and the receiving frame number of the video data received by the students with normal data distribution are combined, so that the network performance of the static multicast communication network is calibrated; and finally, calculating a video transmission quality score by comparing the original frame pixel value of the video data sent by the teacher with the receiving frame pixel value of the video data received by the student, and comprehensively evaluating the service performance of the static multicast communication network in combination with the network performance. And the service performance of the static multicast communication network can be effectively evaluated through a multi-source parameter comprehensive judgment method.

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.

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.

Method and apparatus for configuring sidelink discontinuous reception in a wireless communication system. The method includes a user equipment assuming or considering a sidelink discontinuous reception configuration applied to sidelink multicast communication associated with a group, where the sidelink discontinuous reception configuration includes at least one of an active duration timer length for determining an active duration at the start of each sidelink discontinuous reception period and / or a period length for determining the length of each sidelink discontinuous reception period; deriving or determining a start time of the active duration for each sidelink discontinuous reception period or a start time of each sidelink discontinuous reception period based on at least one identifier associated with the group; and transmitting sidelink control information associated with the group on a sidelink control channel in a period, where the period is determined based on the sidelink discontinuous reception configuration and the start time of the active duration or the start time of each sidelink discontinuous reception period.

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.