73 results about "Optical burst switched network" patented technology

Routing mechanisms for routing data via a plurality of optical switched (OS) networks, such as optical burst-switched (OBS) networks. A plurality of OBS networks are connected to form an enterprise network, which may further include non-OBS networks such as LANs and the like. Each of the OBS networks is modeled as an autonomous system (AS), and one or more edge nodes of each OBS network are designated as external gateway protocol (EGP) routers. Each EGP router maintains a routing table identifying routes that may be used to reach destination networks. The routing table is dynamically updated via update messages that comprise an extension to the Border Gateway Protocol (BGP) and account for optical routing considerations particular to OBS networks. In response to a routing request, data is sent from an internal node using an internal routing protocol to a BGP router edge node. The BGP router edge node then determines a next network hop based on current routing information in its routing table, and the data is routed using an external routing protocol. At the same time, data is routed within an individual OBS network using an internal routing protocol under which data are sent as data bursts via reserved lightpaths.

Optical burst switch network system and method with Just-in-Time (JIT) signaling and advanced data transmission and memory access and management. The system and method allow concurrent data transmission having arbitrary signal types, such as analog and digital signal types, in which the JIT signaling allows for subsequent simultaneous transmission of optical signals that do not require electro-optical conversion. The system includes an optical signal bus having a passive star coupler. A plurality of network adapters that are in optical communication with the optical signal bus and in network communication with network terminal devices are provided. The network adapters include receivers, transmitters and control logic that allows for bi-directional movement of data signals as bursts between the terminal equipment and the network system. The transmitter and receiver may be fixed or tunable. The system further includes an optical bus controller in optical communication with the optical signal bus that processes signals from the optical signal bus to connect a requested network adapter to a requesting network adapter in accordance with the user-to-network protocol. The network system implements a just-in-time signaling protocol to signal nodes in the network that burst communications are forthcoming. Optionally, the system allows comprehensive memory access in a Local Area Network (LAN). The nodes in the network are capable of seamlessly addressing memories of all other nodes that comprise the network.

An optical network scheduling device (10) including a plurality of schedulers (16) each corresponding to a respective channel in the optical burst switch network and configured to maintain a transmission schedule for the respective channel; and a controller (12) configured to receive a burst transmission request and to select at least one of the schedulers as a selected scheduler schedule a burst transmission.

A control packet of an OBS network comprises a label which is switched for fast transmitting each packet from a source host to a corresponding destination host, a wavelength ID for distinction of channel and switching, a CoS field providing different type of CoS, an offset time indicating the difference between an arrival time of the control packet and an arrival time of the data burst, a data burst size and a CRC for error detecting. A data burst generation algorithm uses hysterisis characteristics in the queueing model for an ingress edge node in an optical burst switching network. This algorithm adaptively changes the data burst size according to the offered load and offers high average data burst utilization with a lower timer operation.

A multi-granular light router based on optical burst exchange can support both burst-class and dynamic wavelength routing-class light exchange. Its core optical router uses dual-light-switch matrix for different exchange granularities. Its marginal optical router can support electric IP access and optical dynamic wavelength routing network access. Any input wavelength can be converted to any output wavelength, so the whole network has dynamic wavelength routing power. A mixed signalling mode is used. It is compatible with the current optical network with dynamic wavelength routing and the frture optical network with burst exchange.

An apparatus and method for adjusting a receiving time point of burst data in an optical burst switching network is provided. The method includes comparing a reference time point of a node with a time slot boundary of the burst data; and adjusting the time slot boundary of the burst data in accordance with the reference time point. The apparatus includes a sync detection section which is configured to detect a difference between a time slot boundary of the burst data and a reference time point; and a sync control section which is configured to control shifting and re-aligning the received burst data with the reference time point according to the difference detected by the sync detection section.

A method and a system for entering data in a data processing system is provided. In this case, the data is entered in a number of steps, with a view being displayed at a step in a display region of a display means, with the entering and / or display taking place in subsequent steps at least partially as a function of the data entered in one or a number of preceding steps. To design the step-by-step entering of data in a more user friendly manner, it is proposed to simultaneously display the views of a number of consecutive steps in the display region.

The invention relates to a packing and unpacking method of an ultra high-speed optical burst-switched network and a system thereof. The packing method comprises the following steps: 1) gathering an electric field IP data packet; 2) generating offset time after the gathered IP data packet is subject to route analysis, and forming an optical control packet; 3) modulating the IP data packet into an optical signal, and performing rate multiplication to the modulated optical signal to form an optical data packet; 4) forming a packet optical bursting packet by the optical control packet and the optical data packet, and transmitting the packet optical bursting packet. The invention provides the packing and unpacking method of ultra high-speed optical burst-switched network and the system thereof, which ensures that OBS network has high transmission rate, simple structure and low cost.

The method to protect the burst and fault monitor of an optical exchange network comprises: generating PB and corresponding PBHP in data channel to reflect the fault on optical layer to the electric layer and on-line monitor network performance index; under control or manage, periodic sending PB on channel, while sending corresponding PBHP in advance; receiving and taking out PB on next node to check bit in PB and take count of error code rate; if over the threshold, sending alarm information. this invention can provide fault information fast and rapidly.

A method of utilizing parallel optical fiber to solve link structure and relevant wavelength distribution both being competed by data packet in burst exchange includes forming parallel optical fiber link by two parallel optical fibers in the same attribute and connector, designing relevant wavelength distribution means for formed link, using each optical fiber to transmit the same wavelength and using one of them to transmit control information, carrying out wavelength packet on the other wavelength and distributing wavelength in each packet wavelength as per traditional means.

The invention is a method for solving light burst switch network competition, belonging to optical communication technical field, comprising the steps of: establishing subfield relation: each router on each routing path knows its own subfield and the head node information thereof through the subfield relation; priority determining: as competition happens, competing nodes determine whether burst packet is a priority burst packet or a regulating burst packet according to the given rules so as to process respectively; condition judging: for a competing burst packet determined to regulate burst request, judging regulating conditions it meets, thus adopting DoD, WAoD or discard processing policy; processing of WAoD: dynamically regulating the booked length of a burst packet in some subfield through CLSP signaling protocol; and discarding and releasing resources. And the invention can implement screening conflicting burst packets and provides better transmission assurance for high-quality services, thus able to improve quality of service of OBS network.

The present invention proposes a method to control congestion in an Optical Burst Switched (OBS) network. The method consists in dropping probabilistically a data burst based on an average delay applied to a set of data bursts. Data bursts start being preventively dropped when the average delay goes beyond a pre-determined threshold. <??>At the edge of the OBS network, one may further segregate data packets into 2 distinct flows, depending on whether or not they convey congestion responsive traffic, each flow being next aggregated into distinct data bursts. The content type of a data burst is indicated in some field of the burst header packet (BHP), allowing the core routers downwards to selectively drop data bursts.

Apparatuses and methods are provided which suppress a surge component occurring at an optical amplifier on an optical path through which an optical burst signal is transmitted. An optical amplifier may experience a surge due to the power variation of the optical burst signal that is fed to the optical amplifier. To suppress such a surge component, a power corresponding to a number of wavelengths of an optical burst signal to be input is calculated. The optical amplifier is instructed to generate an optical signal with a power corresponding to a difference between a set value and the calculated power. The generated optical signal and the optical burst signal to be input are coupled and output according to the instruction. Thus, the optical amplifier can receive the optical signal with the constant power and the surge component at the optical amplifier can be suppressed.

The invention relates to an edge node for connecting an Ethernet and an optical burst switching network, which comprises physical layer equipment, a first switching module and a second switching module, wherein the first switching module comprises an Ethernet frame analyzing and burst packet grouping unit, a queue managing unit and a scheduling unit; the second switching module comprises a burst packet analyzing and Ethernet grouping unit, a category temporary-storing unit and an inquiry unit. The realizing method for the edge node comprises the following steps of: judging the flowing direction of data; if the data is sent to the burst packet switching network from the Ethernet, analyzing the Ethernet frame, and grouping the burst packets; storing each burst packet according to the destination addresses; finding an idle channel to send the burst packets; if the data is sent to the Ethernet from the burst switching network, analyzing the burst packets and extracting the Ethernet frame; respectively storing the Ethernet frames according to the destination addresses; finding an idle physical interface to send the Ethernet frame, waiting for the next data, and repeating the steps. The invention has the advantages of full duplex switching and blockage improvement.

The invention provides an adaptive convergence method for the optical bursting network and the device belonging to the technical field of fully optical communication. The data from the access network enters an operation sorter of an OBS node and the sorter sorts the data according to the destination address and QoS requirement and submits the data to a convergence creation module; the convergence creation module is responsible for recording the data length in the convergence queue and the latency time of the data package which is the first in the queue and calculates the sum or product of the data; if the sum or product reaches the preset threshold value, a producer of the bursting data package of convergence adaptive controlled module orders packages the data in queue into a bursting data package and an optical transmitting module delivers the data package into a link through a light wave division multiplexer. The invention is every adaptive to the dynamic changes of the network load and can equalize the end-to-end time delay function of the network.

Preengagement region is designed and constructed around tangent method. Bias time is setup by using bias time sub module. Radio laser signal BHP is sent to boundary chain of radio laser comm. from boundary node interface. Then, BHP is passed and processed through following steps: being received and processed by radio light core node; passing through multicast of core link of radio laser comm. to core node interface of boundary Burst route process; using core node processes BHP, and exchanges information at ports between neighboring core nodes etc. to establishes connection rapidly. The method speeds up operation for preengaging resources to reengagement region in high quality. Comparing with switching network of light outburst in pure fiber, the invention reduces bias time, and time of using resources by BHP.

A dynamic adaptive burst assembling method is to utilize an one-step auto-regression linear adaptive random process estimation model and adopt an orthonormalization minimum mean square deviation predict method to estimate network flow property on line timely an dynamically adjust burst assembling time by estimating the packet length. With the predict time, it combines this time flow weight and one step p stage estimation model and its maximum burst assembling time is dynamically determined by estimating its packet length and the latest load to deliver the control packet before finishing the burst assemble.

An optical burst switching network is provided that includes an edge node transmitting burst data including a plurality of packets; and a core node optically switching received burst data or converting the received burst data into an electric signal and electrically switching the converted burst data.

An apparatus and method for transferring data bursts in an optical burst switching network are provided. In an optical burst switching network including a number of nodes, each node including demultiplexers and multiplexers connected to a plurality of input / output ports for transferring the data bursts through a number of wavelengths, the apparatus for transferring data bursts includes a control module connected between the demultiplexers and the multiplexers for obtaining information in a control packet to sort and confirm service classes of the data bursts according to delay time and blocking rate; a switching unit connected between the demultiplexers and the multiplexers for switching the data bursts to an output port of a corresponding destination node; a first buffer connected between the switching unit and the output port for delaying the sorted and confirmed data bursts from the control module once by a preset delay time according to output resource availability and sending them to the output port when the data bursts are sensitive to delay time; and a second buffer connected between an input and an output of the switching unit for circulating and delaying the sorted and confirmed data bursts up to a preset recirculation limit according to output resource availability and then sending the data bursts to the output port when the data bursts are insensitive to delay time.

A method, core node, ingress edge node, and egress edge node for matching a bit rate of data input into an optical burst switching network with that of data output from the optical burst switching network are provided. The method includes calculating a difference between a frequency of optical data received on a node and a natural frequency of the node; including the calculated difference into control information; and transmitting the control information. The core node includes a calculator to calculate a difference between frequency of optical data and the natural frequency of the optical data; and a controller to add the difference and a difference included in control information, and output the added difference. The ingress edge node includes a data processor; and a controller. The egress edge node includes an ingress edge node clock recovery phase lock loop; a de-mapper; and a storage unit.

Incoming packets are aggregated into optical bursts in an edge node of an Optical Burst Switched Network by the following. Storing the incoming packets to generate an optical burst. Associating each incoming packets with a generated random binary digit with a probability for a first and a second value of the binary digit. A packet with a binary digit having the first value indicates a transition between optical bursts. Sending the optical burst with the aggregated packets when a transition is indicated by the first value.

A method for efficiently allocating incoming burst data to output channels over an optical burst switching network when the number of incoming channels is greater than the number of outgoing channels. To this end, BD transferred on at least two incoming channels are grouped to BDs that do not block each other. BDs in a group are allocated to and transmitted on one outgoing channel. BDs in the group not assigned to the output channel are repeatedly delayed, discover time slots in which BDs in the group assigned to the output channel are not transferred, and use the discovered time slots for the transmission.

A light burst exchange network edge nodal structure includes a control packet, a light packet emit module, a WDM, an adaptive flow assembly module and a bias determining module, among which, the adaptive module is connected with the bias determining module then to join in the control packet emit module to be connected in the WDM to be transferred together with the light packet emit module, a control packet trigger module in the adaptive flow assemble module is connected into AAR(P) filter, I(n-1) and e(n) memory are also connected into the AAR(P) filter as the input, the output of AAR(p) is connected with a packet length determine module, output of which is linked to dynamic BAT decisive module.

This invention relates to a parallel dispatch method in a light burst exchange network, in which, when a core node receives a control frame containing resource preengaged information, it transmits said control frame to the next node timely in the mode of self-routing and routes another copy to the local area for resource preengaging process, the method also includes the following steps: the edge node generates a burst frame serial number with an only ID in a network to each due out datum relating to different kinds of related signaling frames belonging to a same data frame in the association method.

An implement method of reservation protocol with multi-services convergence transmission for OBS networks differentially processes the synchronous service flow and the asynchronous service flow, and assembles multiple different types service data into different data burst (DB) by generalized optical-burst paradigm. It functionally expands burst control packet (BCP) and classifies the BCP into two categories: routine burst control packet (R-BCP) and synchronous trace burst control packet (T-BCP). Then it can differentially reserve wavelength channel resource and preempt resource to try to keep the transmission features of synchronous service such as period, low delay jitter and low dropping probability on the base of ensuring the basic QoS requirements of various kinds of service, and realize that a single OBS network efficiently provides asynchronous service and synchronous service.

This invention relates to a new type of access control protocol, which can be used in the ring networks applying the light burst technology, in which, the nodes in a ring network control the shared network bandwidth and interfaces effectively to avoid the appearance of burst conflict to increase the usability and network performance light burst switch network resource.

The embodiment of the invention provides a data transmission method, device and system based on an optical burst switching network. A first edge satellite node in the plurality of edge satellite nodes, the method is based on the currently cached data, wherein each unpackaged data packet respectively corresponds to a service type; and the respective packaging waiting times of each data packet are calculated. Determining respective packaging priorities of the data packets, determining a first number of data packets from the data packets based on the respective packaging priorities of the data packets, performing data packet packaging on the first number of data packets to obtain corresponding burst control packets and burst data packets, and sending the burst control packets and the burst data packets to the core satellite node. And the core satellite node forwards the received burst control packet and burst data packet, and based on the processing, network service interruption can be avoided to a certain extent.