15 results about "Multicast transmission" patented technology

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 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.

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.

The present disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for enabling a wireless system implementing multicast transmissions to control feedback reporting from multiple user equipments (UEs) and to address feedback codebook misalignment issues. In particular, aspects provide a multicast transmission grant including a plurality of feedback timing indicators (K1), where the multicast transmission grant is configured to configure different UEs for multicast transmission feedback reporting, where feedback codebooks sent from the different UEs in various uplink control transmission occasions have the same size. Other aspects and features are also claimed and described.

The application relates to the field of communication and provides a resource management method for relay-assisted low-orbit satellite multicast transmission, which comprises the following steps: acquiring a plurality of random variables representing random jitter of a high-altitude platform disturbed by air flow, constructing a channel matrix according to the random variables; constructing an optimization problem based on the channel matrix; solving the optimization problem to obtain an optimized antenna selection matrix and an optimized beamforming matrix; selecting an antenna subset according to the optimized antenna selection matrix; pre-encoding signals sent to different multicast groups according to the optimized beamforming matrix, and performing multicast signal transmission to corresponding multicast user groups through the selected antenna subset. The application solves the problem that the prior art lacks accurate modeling of random jitter of a high-altitude platform and dynamic optimization of a beam, leading to poor multicast transmission stability, and realizes joint optimization of antenna selection and beamforming in a jitter scene, effectively reduces the communication interruption probability, and guarantees multicast transmission stability.

The present disclosure describes methods, system, and devices for configuring extended cyclic prefix (ECP) for broadcast and / or multicast transmission. One method includes determining, by a user equipment (UE), ECP resource for at least one of broadcast transmission and multicast transmission according to predefined resources; and receiving, by the UE from a base station, a broadcast transmission or multicast transmission in the ECP resource. Another method includes configuring, by a base station, ECP resource for at least one of broadcast transmission and multicast transmission according to predefined resources; and transmitting, by the base station to at least one UE, a broadcast transmission or multicast transmission in the ECP resource.

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.

The present disclosure provides a multicast transmission method and related device through user equipment to user equipment relay, and relates to the technical field of communication. The method comprises: obtaining, applied to user equipment (UE) to UE relay, parameters for performing multicast UE to UE relay communication from a network or configuring the parameters by itself; supporting relay multicast traffic, wherein the support is directed to UE to UE relay or end user equipment; establishing a routing table based on a mobile ad hoc network routing message; and forwarding multicast traffic based on the routing table. The present disclosure realizes the sending of multicast traffic by supporting multicast traffic and configuring a routing table in user equipment to user equipment relay, and solves the problem of wireless traffic redundancy caused by regularly sending a copy of the same message through multiple proximity service direct link unicast.

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, a counter is maintained to count the number of times a client device requests a particular content segment immediately after requesting that segment most recently transmitted over the multicast channel. Content segments with high count values ​​are those requested immediately by many client devices after that most recently transmitted segment, and are therefore good candidates for the next transmission over the multicast channel.

This disclosure provides a method for multicast transmission of routing messages in proximity service relays, relating to the field of communication technology. The method includes configuring a multicast Internet Protocol (IP) address; establishing a connection between UEs supporting the same relay service code and UEs relaying the same UE; and uploading mobile ad hoc network (MAN) routing messages to the multicast IP address. This disclosure, by configuring a multicast IP address in a UE-to-UE relay and establishing a connection between UEs supporting the same relay service code and UEs relaying the same UE, achieves the uploading of MAN routing messages via multicast IP addresses, solving the problem of radio traffic redundancy during routing table generation / maintenance in proximity service multi-hop UE-to-UE relay communication.

The application provides a CU and DU separated heterogeneous network joint multi-antenna transmission architecture, wherein the CU and DU are separated at the base station end, the transmission architecture comprises a broadcast large tower network and a cellular network with heterogeneous networks, the broadcast large tower network and the cellular network are both provided with multi-antenna transmission, data transmitted by the broadcast large tower network and the cellular network is distributed through a CDN network, and broadcast, multicast and unicast services are jointly transmitted, the transmission module and the resource distribution module in the system are designed at the architecture level, the functional modules are realized, the system diversity gain is improved through the multi-antenna transmission design of the base station, a precoding scheme is designed for different service transmission types, system data flow is mapped to the transmitting antenna, the physical layer bandwidth and power resource distribution of the transmission system is researched, and the sum rate of the system unicast transmission is maximized under the condition of guaranteeing the broadcast and multicast transmission rate.

Methods, systems, and devices for wireless communications are described. The method may include a first network node (e.g., a user equipment (UE)) receiving first control information indicative of a first feedback scheme for multicast transmissions in a non-terrestrial network (NTN) and determining an applied feedback scheme based on the first feedback scheme. The method may also include the first network node monitoring for a multicast transmission and operating in accordance with the applied feedback scheme.

The application provides a communication method and device, the method is applied to a terminal device, the terminal device comprises a first multicast radio bearer (MRB), the first MRB comprises a first packet data convergence protocol (PDCP) entity and a first RLC entity, the first RLC entity uses an acknowledgement mode (AM), and the method comprises the following steps: the terminal device receives first indication information sent by a source node, the first indication information indicates that the receiving window of the first PDCP entity is adjusted when the first PDCP entity is reconstructed; and the terminal device adjusts the receiving window of the first PDCP entity according to the first indication information. According to the application, the terminal device configured with an AM MRB can normally receive multicast service data when switching nodes, data packets are avoided to be lost, the continuity of multicast service and the reliability of multicast transmission mode are improved, and user experience is improved.