126 results about "Multicast transmission" patented technology

The invention discloses an unmanned cluster hierarchical networking system and a multi-source tree routing protocol implementation method, the method adopts a hierarchical networking form to construct a tree topology, and comprises the steps of constructing the tree topology by taking at least one cluster head node as a root node, forming a transmission path of a far-end node, the cluster head node and a manned node, and establishing a multi-source tree routing; selecting an optimal father node as a relay node of an uplink path by adopting a shortest path first and link quality assisted routing measurement strategy; an uplink routing table is established through periodically broadcasting source tree information, and a downlink routing table is established through tree-shaped routing information feedback maintenance; and establishing and maintaining the multi-source tree topology by using an uplink routing table, a downlink routing table and a point-to-point routing table according to the requirements of uplink multi-source data convergence, downlink multicast transmission and end-to-end unicast transmission. According to the method, flexible networking, rapid reconstruction and dynamic resource allocation can be met, and the method has the advantages of low routing storage overhead and low calculation overhead.

Methods and systems are disclosed for enhancements to multicast beamforming to support PTM multicast service, concurrent multicast and unicast service, MBS, or group side-link service at the physical layer. A base station or multicast UEs of a wireless communication network may enhance reporting of the channel state information of a link between the base station and the UE and adaptation of the link for multicast beamforming. Enhancements to multicast beamforming may include techniques such as CQI table optimization and SSB-based early CQI reporting, consideration of UE preferences such as the preferred number of retransmissions and frequency-hopping preference for retransmission when designing a time-domain or frequency-domain retransmission scheme common to the multicast UEs, and multi-layer MIMO beamforming for 2-layer multicast transmissions over the horizontal and vertical polarizations and for concurrent multicast and unicast transmissions. The enhancements improve multicast service performance and efficiently allow a UE to gain access to multicast service.

The present application relates to devices and components including apparatus, systems, and methods to provide multicast transmissions during an inactive state of a user equipment.

Multicast and broadcast services (MBS) content data in non-terrestrial networks may be received as a function of whether device location fulfills access conditions and / or the validity of a service area. A device may receive radio network identifiers (RNTIs) with a validity period to decode MBS session data. The RNTIs provided may be a function of cell movement, device location, and / or MBS session area. A device may be configured to receive a list of MBS session IDs. The device may obtain the device's location information. The device may identify one or more valid MBS service areas. The device may transmit information for a network to verify satisfaction of one or more access conditions. The device may receive one or more radio network temporary identifiers (RNTIs) that may be associated with periods of validity. The device may use the RNTIs to decode the MBS data.

Methods and techniques are provided that employ multicast transmission and anycast transmission to coordinate and distribute tasks and / or processing requests amongst groups of resources on a network. In one embodiment, the groups of resources can include nodes or other resources of a blockchain network that implement all or part of a particular blockchain protocol (e.g., Bitcoin SV protocol), and / or service providers that provide services to a blockchain-related organisation, group or network.

Embodiments herein relate to a method performed by a network node in a telecommunication network providing a multicast transmission to a group of devices residing in a cell of the telecommunication network. The network node monitors a congestion level for communication, and, if the congestion level reaches a first threshold, the network node orders for at least one device in a RRC connected mode to be released from the RRC connected mode to an RRC idle mode or an RRC inactive mode, thereby disabling a capability of the at least one device to provide one or more re-transmission requests while keeping an ability of the at least one device to further receive the multicast transmission.

More efficient data transmission of safety-relevant data is achieved by a method for transmitting data between the central control apparatus and a plurality of decentralized devices, which includes generating, in the central control apparatus, a data telegram for the broadcast or multicast transmission of data to a plurality of devices, unidirectionally transmitting the data telegram from the central control apparatus to at least one decentralized device, monitoring the transmission duration of the transmission of the data telegram from the central control apparatus to the at least one decentralized device, and triggering a predetermined safety reaction if the transmission duration exceeds a predefined value. Further, a control and data transmission system designed to carry out the method, and means belonging to such a system.

The present application relates to devices and components including apparatus, systems, and methods to provide processing of multicast data via user equipment while the user equipment is in an inactive state in wireless communication systems.

The present application relates to a method for energy-efficient unicast and multicast transmission in a wireless communication system. A method for time-division multiplexing subframes on a serving cell to a user equipment (UE) wherein an eNodeB indicates the communication via a bitmap, wherein the bitmap indicates a set of subframes (501, 502, 503) operating with a legacy Long Term Evolution (LTE) transmission format using a first bit (bit "0") and another set of subframes (504) operating with an Evolved Transmission New Carrier Type (NCT) format using a second bit (bit "1"), including reduced density cell-specific reference signal (CRS) transmission without a physical downlink control channel (PDCCH) control region.

A wireless device receives parameters indicating the following: a first discontinuous reception (DRX) configuration associated with a unicast transmission, and a second DRX configuration associated with a multicast transmission. The wireless device receives a power saving (PS) indication of a PS operation indicating a DRX on duration. In response to the PS indication indicating the PS operation, the wireless device skips monitoring a first physical downlink control channel (PDCCH) associated with the unicast transmission during a first DRX on duration of the first DRX configuration. Regardless of the PS indication, the wireless device monitors a second PDCCH associated with the multicast transmission during a second DRX on duration of the second DRX configuration.

Methods, systems, and apparatus for user equipment (UE) device-to-device sidelink wireless communications utilizing transmit power adjustments provided via transmit power control requests. A group of UEs may communicate using a sidelink multicast transmission, and a sidelink multicast transmitter may increase or decrease the transmit power of the multicast transmission to achieve more efficient and reliable transmission. Each UE receiving a multicast transmission from a sidelink multicast transmitter may have a different set of radio resources that may be used to transmit transmit power control indications to request higher or lower transmit power at the transmitting UE. Alternatively, radio resources for providing transmit power indications may be provided separately for TPC-UP indications and for TPC-DOWN indications.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first control information indicative of a resource allocation for reception of periodic multi-slot multi-cast transmissions. In some aspects, the control information may indicate a semi-persistent scheduling (SPS) configuration for multi-cast, multi-slot signaling. The resource allocation may include a set of multiple reception occasions over a set of multiple slots. The UE may receive one or more transport blocks during the set of multiple reception occasions over the set of multiple slots. In some aspects, the UE may transmit feedback information for the one or more transport blocks.

The present application relates to the technical field of communications, and specifically relates to a network transmission method, a readable storage medium and an intelligent device, which aim to solve the technical problem of how to achieve lower traffic, lower CPU overheads and lower latency on the premise of ensuring the reliability of a network transmission process. To this end, in the present application, a sending end is in communication connection with a receiving end by means of a UDP multicast transmission channel and a TCP transmission channel, wherein the UDP multicast transmission channel is a one-to-many one-way communication channel based on a UDP transmission protocol, and the TCP transmission channel is a one-to-one two-way communication channel based on a TCP transmission protocol. The UDP multicast transmission channel is used for transmitting sent transmission data to at least one receiving end, the TCP transmission channel is used for feeding back a frame loss acknowledgment response to the sending end when the receiving end detects a frame loss of the transmission data, and the sending end re-transmits transmission data corresponding to the frame loss answer response. The advantages of TCP transmission and UDP multicast transmission are effectively combined, thereby ensuring the reliability of a transmission process, and saving on traffic and CPU overheads.

Embodiments of apparatuses, systems, and methods for enabling flexible acknowledgments for a user equipment (UE) and a network are presented. The UE may determine whether to request feedback (e.g., HARQ ACK / NACK) for one or more multicast transmissions. The determination may be based on factors such as the remaining time to perform the transmission and the amount of time required to perform the transmission given the time available or not available to receive and process feedback.

The present disclosure relates to a method of performing operations for a User Equipment (UE) in a wireless communication system. In particular, the method includes steps of receiving a medium access control (MAC) protocol data unit (PDU) related to a Hybrid Automatic Repeat and request (HARQ) process on a downlink multicast assignment from a non-terrestrial network (NTN); setting a first HARQ round trip time (RTT) Timer for the HARQ process to a second HARQ RTT Timer plus a latest available UE-gNB RTT value; starting the first HARQ RTT Timer for the HARQ process; and based on the first HARQ RTT Timer being expired, starting a retransmission timer for the HARQ process.

This invention discloses a method for optimizing multicast paths in a specified source multicast SSM environment under IPv6, relating to the field of IPv6 multicast transmission technology. The method includes acquiring real-time network node status information and establishing a network performance model, quantifying the transmission cost and potential bottlenecks of each link in the path, and calculating the comprehensive transmission overhead estimate of the initial multicast forwarding path. A path evolution engine searches for a set of alternative forwarding paths in the network topology, calculates the comprehensive transmission overhead estimate of each alternative path, filters out a set of candidate optimized paths with lower overhead than the initial path, selects the path with the lowest overhead as the optimized multicast forwarding path, and forwards the multicast data to the receiver along this path. This invention can achieve accurate quantification of link-level transmission performance, adapt to real-time network status, determine the optimal path through two-level filtering, avoid link bottlenecks, reduce multicast transmission overhead, and improve the adaptability and transmission efficiency of IPv6 SSM multicast transmission.

A communication method and apparatus, the method comprising: a network device sending multicast configuration information to a terminal device, the multicast configuration information corresponding to a first multicast service, the multicast configuration information comprising first indication information, the first indication information indicating that the terminal device needs to send first feedback information to the first multicast service, and the terminal equipment receives the first multicast service according to the first multicast configuration information, and then sends first feedback information corresponding to the first multicast service to the network equipment according to first indication information in the first multicast configuration information. By adopting the method and the device provided by the invention, a feedback mechanism of a multicast transmission technology can be realized, and the transmission reliability of the multicast service is improved.

A method for managing content distribution in a network with multiple proxy servers, each connected to one or more clients, is described. The method determines which content segments should be transmitted over a multicast channel by considering client requests for content segments. More specifically, the method describes a scheme that allows skipping specific segments already requested by client devices and instead transmitting newer segments for transmission over the multicast channel, thereby enabling the multicast channel to quickly move closer to the edge of the live content.

A method for communication between a plurality of devices of a power conversion system includes synchronizing, in time, N devices (N is a natural number of two or more) with each other so as to make a control period common to the N devices. The control period includes at least one control data communication duration, and the control data communication duration includes N time slots. The method for communication includes a control data communication step in which, in an i-th time slot (i=1 to N), an i-th device among the N devices transmits control data by multicast and other devices among the N devices receive the control data.

The invention discloses a quantum trusted relay multicast routing method and system. The quantum trusted relay multicast routing method is used for a cryptographic service management center, and comprises the following steps: in response to a group key distribution request initiated by a source node, obtaining state information of a quantum key distribution network; constructing a multicast routing distribution path according to the state information; and sending a routing instruction to the source node and the trusted relay node based on the multicast routing distribution path. Therefore, multiplexing of a network sharing link is realized by constructing a multicast routing distribution path, and compared with repeated transmission of the same secret key in a point-to-point distribution mode, original multiple point-to-point transmission is integrated into one multicast transmission, so that the total time of secret key distribution is shortened to a certain extent, the occupation of network bandwidth is reduced, and the transmission efficiency is improved. Therefore, the distribution efficiency of the quantum key and the utilization rate of the network bandwidth are improved to a certain extent.

The invention relates to a method for energy efficient unicast and multicast transmission in a wireless communication system. A method of time division multiplexing subframes on a serving cell to a user equipment (UE) in which an eNodeB indicates communication through a bitmap, wherein the bitmap indication indicates a set of subframes (501, 502, 503) operating with a legacy long term evolution (LTE) transport format using a first bit (bit '0') and another set of subframes (504) operating with an evolved transmission new carrier type (NCT) format using a second bit (bit '1'), including, in the absence of a physical downlink control channel (PDCCH) control region, determining whether or not the first bit (bit '0') indicates a set of subframes (501, 502, 503) operating with the legacy long term evolution (LTE) transport format using the second bit (bit '1'). The invention relates to cell-specific reference signal (CRS) transmission with reduced density.

A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving configuration information about a multicast broadcast service (MBS), receiving MBS data in a radio resource control (RRC)_Connected mode based on the configuration information, and wherein the MBS data is transmitted to a plurality of UEs including the UE for a multicast transmission, or to the UE for a unicast transmission, and wherein a hybrid automatic repeat request (HARQ) retransmission is applied to the transmission of the MBS data.

The invention provides an information transmission method, device and equipment based on multicast. The method comprises the following steps: receiving an initial message sent by a source terminal; at least one opposite-end routing site corresponding to a source terminal is inquired based on a multicast distribution tree where a root CPE is located, the multicast distribution tree comprises the root CPE and at least one leaf CPE, and each CPE in the multicast distribution tree generates a respective target routing table; packaging a corresponding target message for each opposite-end routing site based on the initial message and a target routing table of the root CPE, and obtaining a target message corresponding to the at least one opposite-end routing site; and distributing each target message to a corresponding opposite-end routing site, so that the opposite-end routing site decapsulates the target message to obtain an initial message, and sends the initial message to a target terminal. The multicast transmission is realized on the basis of the unicast tunnel, the WAN equipment does not need to additionally upgrade the multicast supporting capability, and the deployment simplification of the multicast service in the SD-WAN scene is facilitated.

This application provides a data transmission method and an apparatus, and relates to the field of communication technologies. A proper HARQ mechanism is designed to ensure a normal HARQ in unicast transmission or multicast transmission. The data transmission method includes: receiving scheduling information from a first communication apparatus; determining transmission indication information based on the scheduling information; receiving, based on the scheduling information, a first transport block from the first communication apparatus, and determining first hybrid automatic repeat request HARQ information of the first transport block; and determining a first HARQ process based on the first HARQ information and the transmission indication information, and allocating the first transport block to the first HARQ process.

There is provided a control device that executes control in a network including a video processing unit that performs processing on video data sent from a video sending device and a network device that performs transfer processing of the video data, the control device including a processing determination unit that determines video processing in the video processing unit and transfer processing using multicast in the network device, based on a plurality of items of predetermined layout information and layout information selected by each client terminal from the plurality of items of layout information.

Embodiments of this application provide a data transmission method, which may be applied to a multi-hop IAB scenario. The method includes: A first IAB node receives a first data packet; and the first IAB node sends a second data packet to a plurality of second IAB nodes through multicast, where the second data packet is determined based on the first data packet, and the plurality of second IAB nodes are next-hop nodes of the first IAB node. According to this application, after the first IAB node receives a data packet, if a next node of the first IAB node includes a plurality of second IAB nodes, the first IAB node may send a data packet to the plurality of second IAB nodes through multicast, to implement multicast transmission in a multi-hop IAB scenario.

The invention relates to an in-cluster vehicle V2V information transmission method for the Internet of Vehicles. The method comprises the following implementation steps: firstly, predicting the motion state of vehicles in a heterogeneous traffic flow scene to obtain a predicted distance difference between the vehicles; secondly, initial cluster division is carried out according to the V2V transmission distance limitation and the predicted distance difference between vehicles, and then a correlation parameter S and a car-following factor CF are set to carry out cluster entering judgment; and finally, determining transmission nodes in the finally formed cluster according to a cluster entering judgment result, and carrying out hierarchical design on the nodes: adopting a multicast transmission mode for the first-stage transmission nodes, adopting a unicast transmission mode for the second-stage transmission nodes, and finally realizing an intra-cluster data transmission method. Simulation results show that compared with a method only performing multicast transmission and an AAGS method, the average transmission rates of the in-cluster member vehicles performing trunking communication are respectively improved by about 27.21% and 69.02%. Experiments prove that the method can effectively solve the problem that the transmission rate of information in the cluster is limited in a heterogeneous traffic flow scene.

Systems and methods for network-based intelligent multicasting in cellular networks are disclosed. User Grouping Criteria (UGC) are generated for User Equipment (UEs) within a cell. The base station determines a group of UEs capable of device-to-device (D2D) communication that satisfy the UGC. Multicasting transmissions for the group are scheduled using D2D communication, facilitating direct communication without routing data through the base station. The UGC considers factors including UE capabilities, measurement reports, Channel Quality Indicators (CQI), locations, and directionality. Error management and retransmission protocols ensure reliable D2D communication. The system facilitates optimization of network resource utilization, reduces base station load, and improves spectral efficiency by utilizing D2D capabilities for multicasting in scenarios where multiple UEs are in close proximity.

This application relates to the field of communication technologies, especially to V2X, intelligent driving, intelligent and connected vehicles, and the like. The method includes: sending, by a first terminal, first information to a second terminal, where the first information includes information indicating a feedback manner of first data, the first data is a data packet sent by the first terminal to the second terminal, the feedback manner is a first feedback manner or a second feedback manner, the first feedback manner is that the second terminal feeds back, to the first terminal, only acknowledgement information indicating that the data packet fails to be received, and the second feedback manner is that the second terminal feeds back, to the first terminal, acknowledgement information indicating that the data packet is successfully received or fails to be received. The method is applied to a multicast transmission process.