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549 results about "Multicast communication" patented technology
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Method and apparatus for on demand multicast and unicast using controlled flood multicast communications
ActiveUS7184421B1Efficient routingEasy to collectSpecial service provision for substationData switching by path configurationFlexible MechanismsTraffic capacity
Network configuration hierarchy information is maintained using flexible mechanisms and methods for establishing routes and transferring information between nodes in ad-hoc data communication networks using on-demand multicast and unicast techniques. Communication nodes use network topology information to build and maintain a dynamically mobile, wireless, ad-hoc network capable of efficiently routing both unicast and multicast traffic. Network nodes that facilitate the collection and distribution of network topology and routing data are dynamically selected, configured, and maintained. Network traffic overhead necessary for maintaining and distributing network routing table information is held to a minimum and efficiently distributed across the network, thereby reducing the potential for network traffic bottlenecks due to network overhead processes.
Owner:STINGRAY IP SOLUTIONS LLC
Satellite based content distribution system using IP multicast technology
InactiveUS7161934B2Multiplex system selection arrangementsSpecial service provision for substationContent distributionReal-time data
A method and system of performing IP multicast includes a client at one of many downstream networks that sends a request signal to an upstream network via a return channel (e.g., the Internet), and the upstream network sends the request to a media server. The media server, and for live data, a media encoder, processes a media stream to generate a real-time IP multicast communication that is output to a unidirectional satellite that transmits the IP multicast communication to the client without delay via the downstream network, and can convert the IP multicast to unicast. The bidirectional return channel allows the source to calculate billing information based on client usage statistics, and transmits confirmation acknowledgement based on a confirmation request from the upstream network. Because the routing configuration is transparent to the rest of the network, the invention applies to multi-hop networks on both sides of the satellite link.
Owner:INTELSAT SERVICES
System and method for receiving over a network a broadcast from a broadcast source
InactiveUS7296091B1Maximize their deployabilityFast re-configurationMultiplex system selection arrangementsSpecial service provision for substationTelecommunications linkMulticast address
A system and method for providing a broadcast to a receiver via a communication network. In particular, the broadcast is received via at least one global multicast channel. At least one local multicast channel is associated with the global multicast address. Then, a communication link is established between the receiver and the local multicast channel, and the broadcast is routed from the global multicast channel to the local multicast channel to provide the broadcast to the receiver. The number of the receivers which are receiving the broadcast may be determined. The receiver may include an Internet Protocol (IP) interface which enables the receiver to receive the broadcast via an IP-type multicast communication. The receiver may also be wireless, and can receive the broadcast in a first subnet using a multicast communication. Prior to the receiver moving to a second subnet, a request is generated by the receiver to receive the broadcast in the second subnet. After receiving the request, the broadcast is provided to the wireless receiver in the second subnet using the multicast communication.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
System for multicast communications in packet switched networks
InactiveUS6625773B1Special service provision for substationError prevention/detection by using return channelCommunications systemNetwork packet
A multicast communication system for small groups using a protocol to indicate to routers receiving a packet according to the protocol to perform the following process: (1) determining a next hop for each of the destination nodes listed in the packet received; (2) partitioning the destination nodes into groups according to the next hop determined for each destination node in the preceding step; (3) replicating the packet such that there is at least one copy of the packet for each of the next hops; (4) modifying the list of addresses for the destination nodes such that the list of addresses for each of the next hops includes only the addresses for the destination nodes to be routed in that next hop; and (5) transmitting the modified copies of the packet to the next hops found in the previous steps for routing to the addresses included in each packet.
Owner:GOOGLE LLC
Device, system and method of multicast/broadcast communication
InactiveUS20080002691A1Data switching by path configurationBroadcast service distributionIP multicastMulticast communication
Device, system and method of multicast / broadcast communication. For example, an apparatus in accordance with an embodiment of the invention includes a transmitter to transmit, in response to an incoming multicast communication frame received from a multicast communication source, a multicast acknowledgment frame indicating receipt of the incoming multicast communication frame.
Owner:INTEL CORP
Mobile ad hoc network (MANET) providing quality-of-service (QoS) based unicast and multicast features
ActiveUS20050053094A1Increase node connectivityReduce distractionsEnergy efficient ICTError preventionQuality of serviceData transmission
A mobile ad hoc network (MANET) may include a plurality of mobile nodes each including a wireless communications device and a controller connected thereto. The controller may operate in accordance with a multi-layer protocol hierarchy. More particularly, at an upper protocol layer, the controller may establish a quality-of-service (QoS) threshold. Furthermore, at at least one intermediate protocol layer below the upper protocol layer, the controller may select between unicast and multicast communications modes based upon the QoS threshold. As such, at a lower protocol layer below the at least one intermediate protocol layer, the controller may cooperate with the wireless communications device to transmit data to at least one destination mobile node based upon the selected communications mode.
Owner:STINGRAY IP SOLUTIONS LLC
Performing multicast communication in computer networks by using overlay routing
InactiveUS7133928B2Efficient managementSpecial service provision for substationDigital computer detailsRouting tableMulticast network
An overlay protocol and system for allowing multicast routing in the Internet to be performed at the application level. The overlay protocol uses “native” Internet multicast and multicast routing protocols to route information, according to overlay routing tables. Overlay groups are mapped to native multicast groups to exploit native multicasting in regional or local forwarding domains. Use of the overlay protocol allows overlay distribution to be handled in a more intelligent and bandwidth-managed fashion. Overlay routers are placed at each of several local area networks, Internet service provider's point of presence, enterprise, or other cohesively-managed locations. The overlay computers are configured according to bandwidth and security policies, and perform application-level multicast distribution across the otherwise disjoint multicast networks by using the overlay routing. The result is an overlay multicast network that is effectively managed according to local network management policies. Application-level control can be applied to the transferred data at the overlay routers.
Owner:GOOGLE LLC
System, device, and method for controlling access in a multicast communication network
InactiveUS7360084B1User identity/authority verificationDigital computer detailsDistribution treeNetwork packet
A system, device, and method for controlling access in a multicast communication network uses a centralized host authentication scheme to prevent unauthorized hosts from joining a shared multicast distribution tree. Each authorized host is allocated a unique authentication key, which is used by the designated router to encode the PIM join message and by the rendezvous point router to authenticate the PIM join message. If the PIM join message is authentic, then each PIM router from the rendezvous point router to the designated router establishes appropriate multicast routes to route multicast packets to the host. If the PIM join message is not authentic, then multicast packets are prevented from reaching the host.
Owner:RPX CLEARINGHOUSE
System and method for enabling multicast telecommunications
InactiveUS7079495B1Eliminates and reduces disadvantage and problemEffectively participate in a telecommunication sessionSpecial service provision for substationInterconnection arrangementsMulticast addressComputer science
A communication network is provided that includes a unicast telephony device, and a plurality of multicast telephony devices operable to receive multicast media streaming transmitted to a multicast group address. The communication network further includes a multicast intermediary operable to receive multicast media streaming sent to the multicast group address. The multicast intermediary is further operable to communicate the media streaming to the unicast telephony device to enable the unicast telephony device to participate in the multicast communication with the multicast telephony devices.
Owner:CISCO TECH INC
Scaleable message system
InactiveUS7177917B2Improve scalabilityOvercomes drawbackMultiprogramming arrangementsMultiple digital computer combinationsClient-sideMulticast communication
A message system for delivering data in the form messages between message clients comprises a server cluster with a group of client manager nodes and a group of independent message manager nodes. The client manager nodes have the function of managing client connections, whereas the message manager are configured to store and distribute messages. The system further comprising communication channel means in the form of a multicast messagebus for providing a multicast communication channel between said at least one client manager node and said at least one message manager node. The system guarantees delivery of a message by storing it until a receiver is ready to consume it.
Owner:TAIWAN SEMICON MFG CO LTD
Multicast communication device and method
InactiveUS6735177B1Quick changeReduce the burden onSpecial service provision for substationError preventionComputer networkShortest distance
In a multicast communication network, each of the nodes stores a table containing distances between each of the multicast communication nodes and the other multicast communication nodes. When receiving a destination list, the node sequentially selects a node having a shortest distance from the destination list by referring to the table to generate a multicast route. Communication is made through the multicast route.
Owner:NEC CORP
Network node apparatus and virtual connection control method for providing various service attributes in multicast communication
InactiveUS6144661ASpecial service provision for substationData switching by path configurationMulticast communicationConnection control
A system for forming one point-to-multipoint connection provides various service attributes in an ATM network in response to differences in service attributes requested by receiving parties or differences in available resources. A network node sets up an output VC (Virtual Channel) link to be connected to an input VC link, the VC links being parts of a point-multipoint connection, receives a new VC link set-up request, and adds to the point-multipoint connection, in response to the new VC link set-up request, new output VC link with service attribute different from that of the input VC link.
Owner:KK TOSHIBA
Method and system for providing acknowledged broadcast and multicast communication
ActiveUS20070076739A1Shorten the timeEasy to receiveError preventionTransmission systemsComputer networkMulticast communication
A method and system to acknowledge a multicast message includes informing each node in a network about each multicast group to which it belongs, a relative position in each multicast group to which it belongs, and a group size of each multicast group to which it belongs, transmitting the multicast message, and transmitting, by each node in the multicast group, an acknowledgment in an assigned slot, which is determined by the relative position.
Owner:ROBERT BOSCH GMBH
Reconfigurable, fault tolerant, multistage interconnect network and protocol
InactiveUS20060013207A1Improve fault toleranceReduce contentionMultiplex system selection arrangementsRadiation pyrometryFault toleranceMassively parallel
A multistage interconnect network (MIN) capable of supporting massive parallel processing, including point-to-point and multicast communications between processor modules (PMs) which are connected to the input and output ports of the network. The network is built using interconnected switch nodes arranged in 2 [logb N] stages, wherein b is the number of switch node input / output ports, N is the number of network input / output ports and [logb N] indicates a ceiling function providing the smallest integer not less than logb N. The additional stages provide additional paths between network input ports and network output ports, thereby enhancing fault tolerance and lessening contention.
Owner:TERADATA US
Robust unicast/broadcast/multicast communication protocol
ActiveUS20100165963A1Reduce in quantityLoop networksWireless commuication servicesBasic serviceMulticast communication
Methods and apparatus for implementing a robust unicast / broadcast / multicast protocol are provided. In one aspect, a method of avoiding collision of intra-basic service set unicast, broadcast or multicast transmissions notifies stations in the basic service set of a reserved transmit opportunity for a unicast, broadcast or multicast transmission. Transmissions from at least one station in the basic service set are deferred until after the reserved unicast, broadcast or multicast transmit opportunity.
Owner:STMICROELECTRONICS SRL
Mbms acknowledgements on rach
ActiveUS20070071025A1Avoid collisionLimited amountSpecial service provision for substationError prevention/detection by using return channelTelecommunicationsMulticast communication
The present invention relates to multicast communication systems and in particular to the implementation of a random access uplink channel, which can be used, e.g., for transmission of acknowledgement messages for received data. In order to prevent frequent collisions on said channel, the transmission of acknowledgement messages is spread at least over time or, additionally, with regard to another distinguishing channel property, e.g. a RACH sub-channel or RACH-signature.
Owner:TELEFON AB LM ERICSSON (PUBL)
Method and system for an OS virtualization-aware network interface card
Aspects of a method and system for an operating system (OS) virtualization-aware network interface card (NIC) are provided. A NIC may provide direct I / O capabilities for each of a plurality of concurrent guest operating systems (GOSs) in a host system. The NIC may comprise a GOS queue for each of the GOSs, where each GOS queue may comprise a transmit (TX) queue, a receive (RX) queue, and an event queue. The NIC may communicate data with a GOS via a corresponding TX queue and RX queue. The NIC may notify a GOS of events such as down link, up link, packet transmission, and packet reception via the corresponding event queue. The NIC may also support unicast, broadcast, and / or multicast communication between GOSs. The NIC may also validate a buffered address when the address corresponds to one of the GOSs operating in the host system.
Owner:AVAGO TECH INT SALES PTE LTD
Method and apparatus providing secure multicast group communication
InactiveUS7434046B1Eliminating single point of failureReduce in quantityKey distribution for secure communicationMultiple keys/algorithms usageComputer networkGroup session
An approach for establishing secure multicast communication among multiple members that participate in a multicast group is disclosed. In one feature, multiple multicast proxy service nodes (MPSNs) are defined and control when members join or leave the multicast group. The MPSNs are logically represented by a first binary tree in which each node of the first binary tree is associated with a domain of a directory service and one or more of the MPSNs. A second binary tree is created that has leaf nodes representing each member. The second binary tree is stored in a domain of the directory service with a root node that represents one or more of the MPSNs. The members can each establish multicast communication and serve as a key distribution center. When a member joins the multicast group, a new group session key is determined by replicating a branch of the second binary tree.
Owner:CISCO TECH INC
System and method for multipoint conferencing with scalable video coding servers and multicast
ActiveUS20080239062A1Easy to useMinimize bandwidth overheadTwo-way working systemsDigital video signal modificationMulticast communicationCommunications server
A multicast scalable video communication server (MSVCS) is disposed in a multi-endpoint video conferencing system having multicast capabilities and in which audiovisual signals are scalably coded. The MVCVS additionally has unicast links to endpoints. The MSVCS caches audiovisual signal data received from endpoints over multicast communication channels, and retransmits the data over either unicast or multicast communication channels to an endpoint that requests the cached data.
Owner:VIDYO
System and method for dynamically selecting wireless information communication modes for a wireless communication device
ActiveUS20070133484A1Convenient wireless transmissionSpecial service for subscribersTime-division multiplexTelecommunicationsMulticast communication
A system, method, and wireless device for dynamically selecting a wireless information communication mode for wireless communication of information to at least one wireless device (104). The method includes receiving at least one request for wireless communication of information to at least one wireless device (104). The method further comprises selecting, based at least in part on a total number of wireless devices to receive the wireless communication of information, a mode of wireless communication of information to the at least one wireless device (104). The mode of wireless communication being selected from at least one of a wireless information broadcast communication mode, a wireless information multicast communication mode, and a wireless information unicast communication mode. The at least one wireless device (104) is wireless notified to set its current wireless communication mode to the selected mode of wireless communication to receive the wireless communication of the information.
Owner:GOOGLE TECH HLDG LLC
Mobility management of multiple clusters within a wireless communications network
InactiveUS20090082025A1Broadcast transmission systemsData switching by path configurationBroadcast channelsNetwork control
Aspects of mobility management within a wireless communications network including a plurality of sectors are disclosed. In an example, the wireless communications network includes a first cluster of sectors with at least one target sector and at least one supporting sector. The multicast communication session is carried within both the target and supporting sectors. In another example, a second cluster can be included within the network for supporting the same multicast communication session that includes its own target and supporting sectors. In this example, the first cluster transmits multicast media on a first interlace-multiplex (IM) pair of a downlink broadcast channel (BCH) and the second cluster transmits multicast media on a second IM pair of the downlink BCH. If sectors of the first and second clusters overlap, the network controls a manner in which the first and second clusters carry the multicast media.
Owner:QUALCOMM INC
Method and system for establishing cluster conversation
ActiveCN101098267AReduce the burden onReduce trafficData switching by path configurationBroadcast service distributionRelevant informationClient-side
The invention discloses a method for building multicast communication and a relative system, wherein the method comprises that a service server receives a multicast communication request, the service server according to the information in the request obtains group member list and communication building condition, the service server obtains relative information of the communication building conditions of the members, to judge if the information meets the conditions, and the service server initializes multicast communication building request to the client meeting the conditions of the members to build multicast communication. The invention can resolve the problem of prior art which service server can not select member dynamically according to the current condition of members, to improve multicast communication flexibility and save communication resource.
Owner:HUAWEI TECH CO LTD
Multipath routing optimization for unicast and multicast communication network traffic
InactiveUS20070133420A1Minimize cost functionError preventionFrequency-division multiplex detailsInternet trafficMulticast communication
Multiple paths in a communication network are provided between at least one source node and at least one destination node. The network arrangement may thus support either unicast transmission of data or multicast transmission. Measurements are made at nodes of the network to determine a partial network cost for data traversing the links in the multiple paths. An optimization procedure determines a distribution of the network traffic over the links between the at least one source node and the at least one destination node that incurs the minimum network cost.
Owner:UNIV OF MARYLAND
Communication system
ActiveUS20130294320A1Special service provision for substationAssess restrictionCommunications systemBroadcasting
A communication system is described in which an MBMS service is provided by unicast or broadcast / multicast communication in dependence on whether the number of mobile communication devices indicating an interest in receiving the service is below or above a broadcast threshold. An improved procedure for counting the number of mobile communication devices interested in receiving the MBMS service is also disclosed.
Owner:NEC CORP
Rekeying in secure mobile multicast communications
InactiveUS20070143600A1Easy to calculateReduce the impactKey distribution for secure communicationKey serverGroup controller
A method of inter-area rekeying of encryption keys in secure mobile muiticast communications, in which a Domain Group Controller Key Server (Domain GCKS) distributes Traffic Encryption Keys (TEK) to a plurality of local Group Controller Key Servers (local GCKS), and said local Group Controller Key Servers forward said Traffic Encryption Keys, encrypted using Key Encryption Keys (KEKi, KEKj) that are specific to the respective local Group Controller Key Server (local GCKSi, GCKSj), to group members, said local Group Controller Key Servers (GCKSi, GCKSj) constituting Extra Key Owner Lists (EKOLi, EKOLj) for group key management areas (areai, areaj) that distinguish group members (MMi, MMj) possessing Key Encryption Keys (KEKi, KEKj) and situated in the corresponding group key management area (areai, areaj) from group members (MMij) possessing Key Encryption Keys (KEKi) that were situated in the corresponding group key management area (areai) but are visiting another area (areaj).
Owner:MOTOROLA INC
Method and apparatus for building a medium cost, self similar, self organizing multicast routing tree
InactiveUS6791981B1Special service provision for substationTime-division multiplexNetwork addressingNetwork address
A method for building a hierarchical multicast tree which is centered around a specific node in an Internet Protocol (IP) communications network. The method on a subnetwork comprising dynamically electing a subnetwork leader node for each subnetwork using multicast communications confined to the subnetwork. Receiving a configuration file containing a list of all the network addresses of the nodes in a network. Receiving a number of permissible connections each subnetwork leader node in the network is permitted with other subnetwork leader nodes. And establishing a multicast connection between each subnetwork leader node as identified in the configuration file so that there is a multicast connection path from each subnetwork leader node for each subnetwork and a subnetwork containing a network leader node. In another embodiment, a system and computer readable medium is disclosed to carry out the above method.
Owner:IBM CORP
System, device, and method for receiver access control in a multicast communication system
InactiveUS6963573B1Special service provision for substationData switching by path configurationPolicy decisionMulticast communication
A system, device, and method for receiver access control in a multicast communication network uses a policy service to determine whether a subscriber device can be admitted to a multicast group. The subscriber device accesses the multicast communication network via an access device. The access device uses a policy service to obtain a policy decision from a policy server, where the policy decision indicates whether or not the subscriber device can be admitted to the multicast group. The access device enforces the policy decision by admitting the subscriber device to the multicast group if and only if the policy decision indicates that the subscriber device can be admitted to the multicast group.
Owner:RPX CLEARINGHOUSE
Method for offset-modulation orthogonal frequency division multiplexing transmission with cyclic prefix
ActiveCN101795257ALow signal envelope fluctuation performanceReduce complexityMulti-frequency code systemsTransmitter/receiver shaping networksFrequency spectrumFourier transform on finite groups
Owner:HUAWEI TECH CO LTD
Multicast information delivery system and multicast information delivery method
InactiveUS20050201406A1Ensure qualityReduce adverse effectsSpecial service provision for substationTelephonic communicationComputer networkMulticast communication
Owner:NEC CORP
Server apparatus, terminal device, and method for performing IP multicast communication
InactiveUS20080028211A1Key distribution for secure communicationData switching networksIP multicastTerminal equipment
A presence table stores therein presence information. A storage unit stores therein in associated manner a terminal identifier unique each of a plurality of terminals and an encryption key to be used for multicast communication within a multicast group. A receiving unit receives a subscription request message from a first terminal from among the terminals. The subscription message includes the terminal identifier of the first terminal, and a request requesting subscription to the presence information present in the storage unit. An acquiring unit acquires the encryption key from the storage unit by using the terminal identifier of the first terminal. A transmitting unit transmits acquired encryption key to the first terminal.
Owner:KK TOSHIBA
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