4536 results about "Multicast" patented technology

An approach for establishing secure multicast communication among multiple event service nodes is disclosed. The event service nodes, which can be distributed throughout an enterprise domain, are organized in a logical tree that mimics the logical tree arrangement of domains in a directory server system. The attributes of the event service nodes include the group session key and the private keys of the event service nodes that are members of the multicast or broadcast groups. The private keys provide unique identification values for the event service nodes, thereby facilitating distribution of such keys. Because keys as well as key version information are housed in the directory, multicast security can readily be achieved over any number of network domains across the entire enterprise. Key information is stored in, and the logical tree is supported by, a directory service. Replication of the directory accomplishes distribution of keys. Event service nodes may obtain current key information from a local copy of the replicated directory.

In an MPLS network, multicast, broadcast and address learning belonging to the layer 2 functions are realized. An ingress router comprises a frame receiving unit, a determining unit, a first frame transmitting unit, a physical address table for multicast, a label switching unit, a tunnel label table, a VCID giving unit, a L2 header creating unit and a second frame transmitting unit. The load on the network is suppressed, the band is efficiently used, and wasteful frame duplication and frame forwarding between edge routers are avoided.

A peer-to-peer platform makes use of a streaming agent running at each peer. The streaming agent causes a peer to receive chunks of content from different neighboring peers, store some of the chunks in a local cache, and distribute those cached chunks to neighboring peers. Delivering next generation broadcasts (e.g., as streams of live audio and digital media) of any size utilizing the Internet is achieved. Users can view a live or prerecorded stream of a broadcast through an integrated media player, or can replay a broadcast through an integrated, intelligent archiving service. Use of the platform reduces bandwidth demands on live streaming and archiving services to a level where it is sustainable within a profitable business model to offer the services for at most a negligible fee.

Multicast routing in ad-hoc networks by exchange of multicast group update information and routing tree information among neighboring routers is disclosed. A router propagates multicast group update information based on the update information and the routing tree information. A router also determines whether to forward multicast data packets based on control information in the multicast data packets and the routing tree information.

Methods and systems to efficiently share multiple satellites and associated transponders or links among a network of uplinking earth stations are disclosed. An embodiment of this invention uses a terrestrial communications link, such as the Internet, to control access to the transponder or satellite links. Communications over this link may employ a TCP/IP protocol to connect the requesting uplinking earth stations with a centralized controller. This control system creates more efficient use of satellite resources and reduces the overall amount of time needed for transmitting data through the satellite. By reducing the overall amount of time needed for transmitting data, the control system may reduce the cost of using the satellite transponder capacity.

A client-server architecture synchronizes streaming content with enhancing content via pre-announced triggers. The architecture includes server-based components to generate announcements containing information specifying how and when to receive upcoming triggers that will be transmitted at a later time. The server transmits the announcements to a general broadcast or multicast IP address. Client-based components monitor the IP address to receive and filter the announcements. Selected announcements are stored in a guide database in correlation with the streaming content programs to indicate that the programs are interactive. When a user tunes to an interactive program, the client opens a container HTML page that contains controls to receive the streaming content program and to extract the announcements from the guide database. The latter control monitors the IP address at the times specified in the selected announcements to receive the triggers corresponding to the interactive program. The server delivers the triggers at times synchronized to the streaming content. When triggers arrive, the client control processes the triggers to coordinate presentation of the enhancing content with the streaming content program. The triggers may further be used to carry items that fill a ticker being displayed with the program.

A technique for content delivery in wireless networks which associates a desired broadcast/multicast (BCMC) territory with the content, estimates cell sector coverage area from a subscriber location data set, and then identifies a set of cell sectors to be sent the content using a BCMC protocol. The method involves first receiving a description of a designated broadcast/multicast (BCMC) territory in terms of a physical area. Next, a content indicator associated with the BCMC territory is identified. The content indicator identifies content, such as text or image data, that is to be supplied to subscribers located in the territory. A cell sector coverage area is then estimated from a subscriber location data set wherein the data set includes at least a geographic location and a cell sector identifier for multiple subscribers. The BCMC territory description and the estimated cell sector coverage areas are then compared against the subscriber location data set to identify a set of targeted cell sectors. Finally, the content indicator is then sent to the set of targeted cell sectors using a BCMC protocol.

A method for controlling a UE (User Equipment) to retransmit an RRC (Radio Resource Control) connection request message in a mobile communication system capable of providing an MBMS (Multimedia Broadcast/Multicast Service). The method includes the steps of determining, by an RRC layer of the UE, if a control message including a timer value corresponding to a cell having the UE is received from a RNC (Radio Access Controller); transmitting the RRC connection request message to the BSC over an uplink common channel when the control message is equal to an MBMS control message; and repeatedly transmitting the RRC connection request message in response to the timer value until receiving a response message from the BSC.

A packet forwarding method for optimizing packet traffic flow across communications networks and simplifying network management. The invention provides look-up-free and packet-layer-protocol transparent forwarding of multi-protocol packet traffic among Layer-N (N=2 or upper in the ISO OSI model) nodes. The invention enables flexible and efficient packet multicast and anycast capabilities along with real-time dynamic load balancing and fast packet-level traffic protection rerouting. Applications include fast and efficient packet traffic forwarding across administrative domains of Internet, such as an ISP's backbone or an enterprise virtual private network, as well as passing packet traffic over a neutral Internet exchange facility between different administrative domains.

Systems and methods are provided for routing voice communications to groups in a voice communication system. The voice communication system can be a mobile communication system having a plurality of members grouped as logical networks and/or unit task organizations. One or more routers are provided in the system. The one or more routers extract routing information from received voice messages. The routing information is used with a router database to determine which identified group to route the digitized voice packets. The one or more routers can be adapted to receive and route voice communications to different radio types across different logical networks.

A multicast non-stop forwarding (NSF) router architecture enhances high availability of a multicast router in a computer network. The router architecture further preserves multicast data forwarding through a data plane during NSF recovery of one or more failures in a control plane of the router. Various multicast components of the router cooperate to provide a checkpointing and recovery technique of the multicast NSF architecture that enables efficient restart and recovery of the control plane failures without loss of data connectivity.

Consistent updates are made automatically over a wide-area IP network, concurrently with read-only access to the remote copies. A replication control protocol (RCP) is layered over TCP/IP providing the capability for a remote site to replicate and rebroadcast blocks of the remote copy data to specified groups of destinations, as configured in a routing table. A volume multicast layer over RCP provides for multicasting to specified volume extents of the blocks. The blocks are copied at the logical level, so that it does not matter what physical structure is used for storing the remote copies. Save volumes buffer the remote copy data transmitted between the primary or secondary file system volume and the IP network, in order to ensure independence between the replication process, the IP transport method, and the primary file system being replicated.

A collaborative nomination algorithm is provided for disseminating information amongst a plurality of collaborating vehicles in an inter-vehicle communication network. The method includes: receiving an incoming vehicle communication message at a recipient vehicle from one of the collaborating vehicles; nominating one of the collaborating vehicles identified in the incoming vehicle communication message to broadcast a subsequent vehicle communication message; and transmitting an outgoing vehicle communication message from the recipient vehicle, where the outgoing vehicle communication message identifies the vehicle nominated to broadcast the subsequent vehicle communication message.

A network performance (e.g., latency and bandwidth) measurement infrastructure for large scale networks based on self-organized probing groups of devices. Each group of devices has a lead device that measures network characteristics, and then shares the measurement information with other devices. This grouping method reduces the amount of network bandwidth needed for adequate measurements, while still providing necessary information to individual devices. The system utilizes a novel multicast-based algorithm that is adopted for both intra-group and inter-group performance measurement. The measurement groups (MeGroups) are dynamic and self-forming, and use a set of heuristic algorithms to optimize the dynamic groupings.

A system and method for providing cost-effective broadband mobile services using a hybrid wireless network consisting of wide-area cellular (“3G”) supplemented by hotspot caches are provided. The proposed architecture uses opportunistic access of high-bandwidth wireless hotspot to dramatically reduce the cost per MB of media delivered to mobile end-users. The system also uses a “semantic multicast routing” approach to caching and delivering media based on individual user profiles.

An information handling system is provided. The information handling system includes a first hypervisor running on a first host and a second hypervisor running on a second host. The first hypervisor managing a first virtual switch, and the second hypervisor managing a second virtual switch. The information handling system also includes a plurality of virtual machines (VMs), including a first VM, which is part of a first tenant, running on the first host, and a second VM, part of a second tenant, running on the second host. The first virtual switch has a mapping in memory that maps a customer-specific multicast IP address, used by the plurality of VMs to indicate a multicast group that includes VMs on the first and second tenants, to a global multicast IP address used by the first and second hosts.

A system for reliable multicast transmission [multicasting data packets] in a packet-based data network includes mechanisms for performing the following: (1) preparing at least one packet comprising a payload portion and multicast route information, an error detection mechanism; (2) transmitting the packet to at least one intermediate node for delivery to at least two destination nodes; (3) waiting for a period of time for at least one acknowledgment signal indicating receipt of the at least one packet by at least one destination node; and (4) retransmitting a packet to a set of destination nodes from which no positive acknowledgment has been received. The multicast routing information includes information for use by the at least one intermediate node to forward the packet to at least two destination nodes.

In a multicast and/or broadcast streaming environment over wired and/or wireless networks, a server provides a plurality of different streams to each group (such as multicast groups) of client devices. Each of the client devices in the respective groups tune in to one of the plurality of streams that is most optimum. Quality of Experience (QoE) metric data or other data pertaining to dynamically changing client device characteristics or channel conditions are collected and evaluated by the server. If results of the evaluated metric data recommend a change to a different stream for a particular one or more client devices, the server switches the client device(s) to a different stream in the same group, or switches the client device(s) to a different stream in a different group if that stream is not available in the current group.

Source routed multicast LSP is described herein. In one embodiment, when a first node receives a first packet having a label stack including a plurality of labels compatible with MPLS (multi-protocol label switching), in response to a first label on a top of the label stack, the first packet is duplicated into a second packet. In addition, at least two labels are popped from the top of the label stack of the second packet forming a third packet. Thereafter, the first and third packets are processed based on a label on the top of the label stack of the first and third packets respectively. Other methods and apparatuses are also described.