30 results about "Overlay multicast" patented technology

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.

The present invention addresses scalability and end-to-end reliability in overlay multicast networks. A simple end-system multicast architecture that is both scalable in throughput and reliable in an end-to-end way is used. In this architecture, the transfers between nodes use TCP with backpressure mechanisms to provide data packet transfers between intermediate nodes having finite-size forwarding buffers. There is also a finite-size backup buffer in each node to store copies of packets which are copied out from the receiver window to the forwarding buffers. These backup buffers are used when TCP connections are re-established to supply copies of data packets for the children nodes after their parent node fails, maintaining a complete sequence of data packets to all nodes within the multicast overlay network. The architecture provides end-to-end reliability, tolerates multiple simultaneous node failures and provides positive throughput for any group size and any buffer size.

A method for constructing an overlay multicast tree to deliver data from a source to an identified group of nodes is provided in which a plurality of nodes are identified and mapped into multidimensional Euclidean space. A geometric region is constructing having a size that is the minimum size necessary to contain the source and all the nodes. Once constructed, a tree is created beginning at the source and including all of the nodes within the geometric region.

Data overhead of mesh-based multicast ad hoc routing protocols are controlled by adaptively adding redundancy to the minimal data overhead multicast mesh as required by the network conditions. The computation of the minimal data overhead multicast mesh is NP-complete, and therefore an heuristic approximation algorithm inspired on epidemic algorithms is employed to increase tractability of a solution. A mobility-aware and adaptive mesh construction algorithm based on a probabilistic path selection is provided, which is able to adapt the reliability of the multicast mesh to the mobility of the network. Simulation results show that the proposed approach, when implemented into On-Demand Multicast Routing Protocol (ODMRP), is able to offer similar performance results and a lower average latency, while reducing data overhead between 25 to 50% compared to the original ODMRP.

Provided is a method and apparatus for configuring and managing an overlay multicast data delivery tree in a transmission network having a SM (session manager) and at least one MA (multicast agent). The method includes the steps of at the MA intending to joining a session, obtaining an active neighbor MA list from the SM; detecting information on QoS information of each neighbor MA in the active neighbor MA list, selecting a MA having the most optimized QoS as a parent MA based on the QoS information of each Neighbor MA in the active neighbor MA list, joining an overlay multicast data communication session through the selected parent MA, periodically receiving HB (heart beat) information having information on a path from a root to the MA and determining whether to perform a parent-switching based on me HB information and parent-switching from the current parent MA to a MA having a better QoS when it is determined to perform the parent-switching

Configuring a direction-based Core Based Tree (CBT) for an overly multicast includes: requesting and receiving from an arbitrary terminal node information on a child node pre-subscribed to a core node; calculating a direction between the arbitrary terminal node and each of the received child nodes, to transmit information to the core node on the child node having a minimum resultant value along with a subscription request message; receiving the subscription request message and the child node information, and comparing a resultant direction calculation value of the corresponding child node and terminal node with a resultant direction calculation value between the pre-subscribed child nodes and allowing the terminal node to subscribe to a child node or a parent node to configure the CBT; and, periodically transmitting and receiving a hello packet between the core node and the terminal node, and among the parent-, child and brother nodes.

Disclosed herein is a method of constructing and managing an overlay multicast tree on the Internet. The overlay multicast tree includes a sender, one or more receivers and one or more agents for relaying data. At the first step, a new participant requests access to the overlay multicast tree from a tree manager while transmitting network characteristic information thereof to the tree manager. The second step is determining an optimal parent node in consideration of the network character information of the new participant having requested access at the first step and network characteristic information of agents participating in a currently constructed overlay multicast tree, and transmitting information of the determined parent node to the new participant. The new participant establishes data channels on the basis of the information of the determined parent node at the third step.

The embodiment of the invention discloses a method for reconstructing an Overlay multicast tree, a multicast tree node and a multicast tree system, wherein the method comprises the following steps: confirming a standby father node in advance for a node in the Overlay multicast tree; and when the node detects that the father node of the node retreats from the Overlay multicast tree, adopting the standby father node as the father node to add the Overlay multicast tree again. By adopting the invention, the system cost can be greatly reduced and the redundant grouping flow is avoided.

A method of configuring a multicast agent and a 1:N overlay multicast network considering a wireless local area network (WLAN) environment of the same are provided. The method includes: a session manger generating a first database with entries of multicast agents subscribing to a session and multicast agents that have applied for subscription to a session but have not been confirmed for normal operation; a multicast agent generating a second database with entries of a path from the root of a tree to which the multicast agent belongs, a hierarchical relation in the tree, the list of probed neighboring nodes, and a list of not-probed neighboring nodes; the multicast agent subscribing to the overlay network; obtaining information on neighboring multicast agents; setting a multicast agent which is determined to be optimal based on the obtained information, as a parent node; and if a multicast agent providing a tree improved from the current tree is found, changing the parent node. According to the method, multicast communication can be easily introduced into a wireless environment without particular modification of existing Internet router equipment.

A method for constructing an overlay multicast tree to deliver data from a source to an identified group of nodes is provided in which a plurality of nodes are identified and mapped into multidimensional Euclidean space. A geometric region is constructing having a size that is the minimum size necessary to contain the source and all the nodes. Once constructed, a tree is created beginning at the source and including all of the nodes within the geometric region.

A method for constructing an overlay multicast tree to deliver data from a source to an identified group of nodes is provided in which a plurality of nodes are identified and mapped into multidimensional Euclidean space. A geometric region is constructing having a size that is the minimum size necessary to contain the source and all the nodes. Once constructed, a tree is created beginning at the source and including all of the nodes within the geometric region.

A method of configuring a multicast agent and a 1:N overlay multicast network considering a wireless local area network (WLAN) environment of the same are provided. The method includes: a session manger generating a first database with entries of multicast agents subscribing to a session and multicast agents that have applied for subscription to a session but have not been confirmed for normal operation; a multicast agent generating a second database with entries of a path from the root of a tree to which the multicast agent belongs, a hierarchical relation in the tree, the list of probed neighboring nodes, and a list of not-probed neighboring nodes; the multicast agent subscribing to the overlay network; obtaining information on neighboring multicast agents; setting a multicast agent which is determined to be optimal based on the obtained information, as a parent node; and if a multicast agent providing a tree improved from the current tree is found, changing the parent node. According to the method, multicast communication can be easily introduced into a wireless environment without particular modification of existing Internet router equipment.

The invention relates to the technical field of network communication, in particular to a method for recovering a multicast routing tree by proactive reconstruction in an overlay network environment. In the method, a node backup protection mechanism reconstructs and recovers a disaster tolerance mechanism of a failed multicast tree communication route in an overlay network; and aiming at the problem of low recovery efficiency caused by dependence on backup of the proactive overlay multicast routing tree recovery method, a method for detecting backup effectiveness between a target node and a backup node is introduced into a global search backup father node strategy and dependence which exists between the backup father node and the protected target node is limited, so that the success probability of recovering a failed overlay network multicast routing tree is improved. The method can greatly improve recovery success rate while slightly reducing recovery time efficiency and is favorable for constructing an overlay network multicast tree with reliable self-recovery capability.

The invention discloses a covering multicast zone file transmitting method and system. An overlaying network is composed of all authoritative servers serving the same cell, a zone file forwarding function is added to all the servers to obtain a novel zone file transmitting system, and the system can achieve multicast transmission of zone files from the main server to other auxiliary servers. The covering multicast zone file transmitting method includes the steps that an original direct transmission between the DNS main server and the DNS auxiliary servers is changed to be indirect transmission with the DNS auxiliary servers as relay nodes; a forwarding dispatch server is additionally arranged and used for collecting link information between all the authoritative servers, a multicast tree is calculated through a certain multicast tree generating algorithm, and respective forwarding tables are calculated for all the authoritative servers. According to the method, because links among the auxiliary servers are used for data transmission, zone file transmission is accelerated, and meanwhile the covering multicast zone file transmitting method and system can save capital and are convenient to achieve and popularize.

The present invention discloses a method and equipment for realizing three-layer multicast on-demand route selection based on PIM-SSM. When the interface is configured with corresponding on-demand path information, or the multicast join message carries on-demand path information, determine whether it is the device corresponding to the first hop in the on-demand path information link; if it is judged to be yes, According to the conventional multicast joining process, establish a multicast routing table entry, and forward the multicast joining message that does not carry the on-demand path information upstream; if the judgment is no, then establish a multicast routing table entry according to the on-demand path information , and forward the multicast join message carrying the on-demand path information to the device corresponding to the previous hop in the on-demand path information link. In the present invention, the flexibility of deploying the forwarding path of the multicast data flow is improved, and the manageability of the forwarding of the multicast data flow is enhanced.

Disclosed is an overlay multicast system for a group media transmission application service composed of a multiple stream, wherein, when an additional stream is newly transferred to a predetermined node in an overlay network, the overlay multicast system transmitting a plurality of streams in the overlay network generates a multiple stream by muxing a main stream inputted from a parent node and the additional stream based on stream correlation information in the predetermined node, and transmits the generated multiple stream to a child node.

The invention provides an overlay multicast method, device and equipment, and the method comprises the steps: building a mapping relation between an overlay multicast group and an underlay multicast group through an SDN controller, transmitting a first flow table item and a second flow table item to a virtual switch where a virtual machine joining the overlay multicast group is located through the SDN controller, wherein the first flow table item is used for removing a large two-layer virtual network package from a received underlay multicast message and forwarding the underlay multicast message to a multicast receiver, and the second flow table is used for adding the large two-layer virtual network package to an Overlay multicast message sent by a multicast source and forwarding the Overlay multicast message to an Underlay switch through an Underlay multicast group address. The virtual switch in the disclosure can realize EVPN multicast under the condition that protocols such as an EVPN multicast routing protocol and the like are not supported, and the multicast routing protocol dependence of the virtual switch is reduced.

The invention belongs to the technical field of wireless self-organizing and sensor network protocols and particularly relates to a relay group based multicasting method in a wireless self-organizing and sensor network. The method includes: in a wireless sensor network, aiming at different energy conditions of rechargeable nodes and non-rechargeable nodes, firstly, constructing connected sub-graphs composed of the rechargeable nodes as alternative relay groups; secondly, constructing a geometrical distance based shortest path tree based on each alternative relay group and overlay multicast group members; and finally, selecting an optimal relay group for multicast grouping and forwarding according the positional relationship of the alternative relay groups and the multicast members. By the method, multicast cost is lowered, burden of the non-rechargeable nodes for multicast grouping and forwarding is reduced, network performance is optimized, and network lifetime is prolonged.

The invention discloses a cross-VLAN multicast implementation method, system and multicast service model. In the above method, the ONU receives the multicast service model from the OLT, wherein the multicast service model includes a new extended management Entity; the ONU calls the extended management entity to modify the configuration information of the downlink multicast data flow. According to the technical solution provided by the present invention, both the downlink configuration of the multicast protocol module and the downlink multicast data flow can be realized, and the effect of promoting the development of the ONU multicast function in the GPON system is achieved.

The utility model provides rack-type OLT equipment and a method for achieving a multicast VLAN therefor. The OLT equipment comprises a main control card and a plurality of line card. The main control card comprises a main control multicast protocol module, and each line card comprises a PON chip, a switching chip, and a line-card multicast protocol module. The method is that the line-card multicast protocol modules are enabled to participate in the processing of a multicast protocol through separating a part of functions from the main control multicast protocol module; the line-card multicast protocol modules extract a group address and the multicast VLAN according to a first multicast protocol message from a user side, so as to form a second multicast protocol message which is sent to a main control card; the main control multicast protocol module extracts the a group address and a multicast VLAN according to a second multicast protocol message, so as to form a third multicast protocol message which is sent to a network side. The method can greatly reduce workload of the main control card of the rack-type OLT equipment, and can greatly prevent an illegal multicast to join a message which is sent to the main control card.

Provided is a method and apparatus for configuring and managing an overlay multicast data delivery tree in a transmission network having a SM (session manager) and at least one MA (multicast agent). The method includes the steps of at the MA intending to joining a session, obtaining an active neighbor MA list from the SM; detecting information on QoS infoimation of each neighbor MA in the active neighbor MA list, selecting a MA having the most optimized QoS as a parent MA based on the QoS information of each Neighbor MA in the active neighbor MA list, joining an overlay multicast data communication session through the selected parent MA, periodically receiving HB (heart beat) information having information on a path from a root to the MA and determining whether to perform a parent -switching based on the HB information and parent-switching from the current parent MA to a MA having a better QoS when it is determined to perform the parent-switching.

The present invention provides a message sent from a base station to a plurality of mobile stations in a wireless network providing a broadcast multicast service, wherein the message includes: one or more fields for providing and configuring in the base station Configuration information related to the multicast service on each frequency in the coverage area; and a flag for indicating that the message includes all of the one or more fields or only includes the one or more fields with The selection fields for configuration information have been updated.

The invention discloses a district file transmission method and system covering multicast. All authoritative servers serving the same district form an overlay network, and a new district file transmission system is obtained by increasing the forwarding function of district files on each server. The system It can realize the function of multicast transmission of zone files from the master server to other slave servers. The transmission method of the overlay multicast zone file of the present invention is: the direct transmission between the original DNS primary server and the DNS secondary server becomes the indirect transmission with the DNS secondary server as the relay node; a forwarding scheduling server is added to collect The link information between each authoritative server is calculated to obtain a multicast tree through a certain multicast tree generation algorithm, and the respective forwarding tables are also calculated for each authoritative server. Because the method of the present invention utilizes the link between the secondary servers for data transmission, the zone file transmission is accelerated. Simultaneously, the present invention can save funds, and is convenient for realization and popularization.

The invention provides an implement method for trans-VLAN multicast in an EPON home gateway. When starting the EPON home gateway, a data structure for storing a trans-vlan multicast vlan id and a wan connecting vlan id is initiated first in a driving layer. After an application layer is started, the trans-vlan multicast vlan id and the wan connecting vlan id are transmitted to the driving layer and saved in the initiated data structure of the driving layer. After a multicast data message containing the trans-vlan multicast vlan id reaches to a wan side of the EPON home gateway, the trans-vlan multicast vlan id in the multicast data message is replaced with the wan connecting vlan id in the driving layer and then the multicast data message reaches to a terminal device on a lan side of the EPON home gateway after processing. Therefore, playing of multicast programs is completed. Loop problems caused by creating virtual devices for the wan connecting vlan id and the trans-vlan multicast vlan id respectively and adding the virtual devices to a bridge device can be solved effectively. The beneficial effects of the implement method provided by the invention is that the whole process can be realized simply and the method can be applied easily; and other services of the EPON home gateway are not influenced and stability of the EPON home gateway performance is guaranteed.

The invention relates to a routing method for realizing Internet multicast in a semi-covering and self-organizing manner, including a network topology organization method and a data packet forwarding control method. The network topology organization method dynamically reconstructs the network into hardware multicast domains, network layer multicast domains and overlay multicast domains according to the positional relationship and link characteristics among members of the same group. The connections are implemented in a single routing protocol. The datagram forwarding control method performs replication, encapsulation or conversion on the multicast data packet according to the established semi-coverage network topology, and then chooses among the three methods of link-level delivery, network layer routing and forwarding, and overlay forwarding. And the most efficient way is to complete the multipoint delivery of multicast data.

An application-layer multicast-based (ALM-based), peer-to-peer conferencing system is disclosed that leverages the differing capabilities of the participating peer nodes. A conference call can be set up among peer nodes of three different types. A bridging node is capable of mixing individual audio signals that are associated with a call into a composite audio signal and of providing the composite audio signal to another node. A mixing-capable node is capable of mixing the individual audio signals that are associated with a call, but not of relaying those signals to another node. A mixing-incapable node does not support the mixing of individual audio signals. The conferencing architecture of the illustrative embodiment is able to account for the differences between the three types of nodes that are to participate in a conference call, resulting in an optimal allocation of bandwidth and processing resources.

The embodiment of the invention discloses a method for reconstructing an Overlay multicast tree, a multicast tree node and a multicast tree system, wherein the method comprises the following steps: confirming a standby father node in advance for a node in the Overlay multicast tree; and when the node detects that the father node of the node retreats from the Overlay multicast tree, adopting the standby father node as the father node to add the Overlay multicast tree again. By adopting the invention, the system cost can be greatly reduced and the redundant grouping flow is avoided.