Electronics and Telecommunications Research Institute

Jeong Dong Ryoo

Tae Sik Cheung

Dae Ub Kim

Sang Min Lee

Jea Hoon Yu

Byung Sun Lee

Tae Whan Yoo

Won Kyoung Lee

Kee Seong Cho

Seong Soon Joo

Tae Kyu Kang

Chang Ho Choi

Yong Wook Ra

Kang Yong Lee

Tea Whan Yoo

Kwang Koog Lee

A frame transmission controlling apparatus includes: a list configuration unit managing a parameter related to a gate control; a cycle timer unit managing a start timing of a cycle; a list executing unit performing the gate control based on the parameter, wherein the list executing unit includes: a cycle executing state machine setting an expiration time of at least one section included in the cycle, checking gate operation information corresponding to a list pointer indicating the at least one section, and performing a control corresponding to the gate operation information; a delaying state machine deducting and updating the expiration time by a predetermined unit; a cycle holding state machine generating a control signal indicating stopping transmission in MAC; and a cycle releasing state machine generating a control signal indicating resuming the transmission in MAC.

Method and apparatus for controlling frame transmission

Provided is a packet transmission apparatus including at least one user network interface (UNI) line card configured to receive traffic including a client signal, a fabric switch configured to perform switching on the traffic based on a unit of line card, a network-to-network interface working (NNI-W) line card configured to generate a multiprotocol label switching-transport profile (MPLS-TP) working tunnel to transmit the traffic transferred through the fabric switch, and a network-to-network interface protection (NNI-P) line card configured to generate a MPLS-TP protection tunnel to transmit the traffic transferred through the fabric switch when a fault occurs on a path of the NNI-W line card.

Packet transmission apparatus for processing operations, administration, and maintenance (OAM) packet and protection switching message

Provided is a linear protection switching method of a node, wherein the method includes selecting a local request based on a priority of at least one local request, determining a global request based on a priority between the selected local request and a remote message, and performing a state transition based on the global request.

Method and apparatus for linear protection switching

A protection switching method and apparatus based on a memory control in a packet transport system are provided. The protection switching method may perform hardware-based protection switching based on a type of path failures that occur. The protection switching method may perform protection switching for each of an Automatic Protection Switching (APS) frame or a Loss of Continuity (LoC)/Clear Loss of Continuity (CLoC) message received via an interface unit from a packet processor, a LoC/CLoC message received via a local bus interface from a host processor, an APS frame generation command input via the local bus interface from protection software (SW) of the host processor, and an APS frame generation command input via another interface unit from the protection SW.

Method and apparatus for protection switching based on memory control in packet transport system

A method for managing an Ethernet ring network of a VLAN-based bridge is provided that includes: registering a major-ring VLAN ID (VID) in a ring port filtering database of a ring protection link owner node in accordance with a request for registering the major ring VID from an Ethernet Ring Protection controller mounted on the ring protection link owner node of a major ring; delivering, by the ring protection link owner node, a VID registration message to other nodes which belong to the major ring through a ring port; receiving the VID registration message through the ring port and registering the major ring VID in a ring port filtering database of each node itself, by each node belonging to the major ring; and delivering, by each node belonging to the major ring, the VID registration message to other nodes belonging to the major ring through the ring port.

Method for managing ethernet ring network of VLAN-based bridge

Provided are a shared mesh protection switching apparatus and method. The shared mesh protection switching apparatus includes a plurality of linear protection switching processors allocated to the linear protection domains respectively and configured to provide a switching report signal in response to fault occurrence in the corresponding linear protection domains or a linear protection switching operation, and perform a function of limiting use of the shared section in response to a provided lock signal, and a mesh protection switching processor configured to select at least one linear protection domain to be limited in use of the network resources of the shared section according to a predetermined reference when the switching report signal is provided and provide the lock signal to a linear protection switching processor corresponding to the at least one selected linear protection domain.

Apparatus and method for protection switching for mesh topolgy

A method for updating a filtering database in a multi-ring network, includes: when the topology of a lower ring in a multi-ring network, in which a plurality of ring networks are connected by two ring connection nodes, is altered and the ring connection node detects the alteration in the topology of the lower ring, erasing, by the ring connection node, its filtering database; generating, by the ring connection node, a control message including a ring ID, a blockage flag, and an erasure flag; transmitting the control message in both directions of the ring; and determining, by a node which receives the control message, to erase a filtering database by referring to and correcting the blockage and erasure flag information included in the control message.

Method for updating filtering database in multi-ring network

Provided is a method and apparatus for controlling congestion of a node in an ad-hoc network comprising: classifying a channel state into a busy channel state and an idle channel state and then monitoring the channel state; performing contention for acquiring a channel with neighboring nodes when data to be transmitted is present during the monitoring of the channel state; calculating an available bandwidth on the basis of the channel state when wins the contention; and determining the amount of data to be transmitted on the basis of the available bandwidth. The nodes in the ah-hoc network monitor their own wireless channel state so as to obtain channel contention information, calculate an available bandwidth from the channel contention information, and control a transmission amount on the basis of the available bandwidth. Accordingly, the nodes can avoid excessive traffic which exceeds channel capacity. Channel contention, which is the most immediate and important cause of a decrease in network performance, can be loosened.

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Daejeon, South Korea

Jeong Dong Ryoo