284 results about "Automatically switched optical network" patented technology

A method and system for multi-domain route computation. In the invention, Path Computation Elements (PCEs) are placed in different layers and computation domains between upper and lower layer PCEs are mapped so that a computation task is divided into multiple computation tasks layer by layer and that the multi-domain route computation is finally fulfilled. The invention separates route computation from signaling and runs route computation tasks in parallel. Route establishment is done by signaling after route computation. The present invention may realize route computation based on complex Traffic Engineering (TE) constraints and enable end-to-end diverse route computation. The invention places PCEs in layers, allowing good scalability and high computation efficiency. The present invention is applicable to the Automatically Switched Optical Network (ASON) and the Multi-Protocol Label Switched Network Traffic Engineering (MPLS-TE) network.

The invention is used for helping multi SPC services with same source and same destination to rapidly establish label-switching path, and at the same time, ensuring the label-switching establishment of said SPC services not to be failure due to insufficient resources, and to rapidly recover from the failure. The method comprises: according to the request, calculating at least one group of route passing through same nodes, and along with said group of routes, establishing one group of label-switching path once. The apparatus thereof comprises a calculation requesting module, a path calculating module and a path establishing module.

The present invention discloses a method for identifying node reachability, a method for identifying a link, a method for calculating a routing, and a method for disseminating node address information. In the method of the node address information dissemination, when the network is initiated, each node in the automatically switched optical network performs a node address aggregation process and an aggregation address dissemination process, and obtains and stores the aggregation address respectively. Therefore, any node in the network may judge whether the node and another node in the network are reachable to each other, and may further calculate the routing between the source and destination nodes pair. Moreover, the present invention also may determine whether any traffic engineering link in the multi-level ASON network is an external link or an internal link.

The invention discloses multi-domain route computing method and system. It includes the following steps: delaminating route computing unit to make computing area map in it; decomposing computing task layering to finish multi-domain route computing. It separates the route from the signaling to eliminate the corresponding risk caused by area-area route technique. In addition, it has good expandability and computing efficiency. Thus the invention can be used in automatic exchange optical network, multi-protocol label exchange network for flow rate engineering expanding.

This invention discloses a method for setting up automatic exchange optical network resumable route selection containing the following steps: A, originating node crossed connection equipments accept a request of setting up resumable route connection; B, selecting a route with the maximum product of applied probability weighting as the service route; C, service route preserving information delivery; D, selecting a route with the smallest sum of link value weighting as the resumed route to balancing the flow and reducing blocking rate of requests; E, renewing service routes and related resumed routes information; and carrying out the resumed route set-up, if line link faults happen to the service routes according to the forward parallel line link set-up protocol to reduce the resumed route time delay.

The method includes following steps: configuring route domain of network and determining boundary nodes and spokesman nodes of route domain; through 'flood' procedure in route protocol, all nodes in route domain obtain full topology information of the route domain; based on configuration information of boundary nodes and network topology information in the route domain, the spokesman nodes generate full connection conglomerate topology of this route domain, and obtain abstracting link of connection between conglomerate topology route and node; calculating available bandwidth attribute of abstracting link; spokesman nodes carries out 'flood' treatment for information of conglomerate topology and abstracting link in route domain in next higher layer. The invention can determine transmitting capacity effectively. Each node obtains transmitting capacity of any route domain in whole network by referring spokesman node of route domain in different layer.

This invention relates to a method for protecting inversions involved by a control plane in an automatic exchange light network which utilize the GMPLS technology to set up label switching paths (LSP) and takes the protected attribute of LSP as one of conditions to provide it to the control plane for route selection operation to realize the route protection and multiplex segment protection involved by the control plane on ASON nod and realize inversion protection by this invented method.

Systems and methods for connections on an Automatically Switched Optical Network (ASON) network including an ASON database and path computation algorithm, mechanisms for Ethernet connections over ASON, and mechanisms for label negotiation for SNCs are provided. Advantageously, the present invention provides mechanisms for ASON path computation and virtual topology management, Ethernet connection establishment, modification, and deletion in ASON networks, and label negotiation without requiring binding and releasing of connections before label negotiation.

The present invention belongs to the field of optical communication technology. The method of establishing optical path includes sending out by the first client equipment node the request of establishing optical path; calculating the route in the optical cross-linking equipment node based on the request and transferring the request to the next client equipment node; checking optical resource state by the local network management system; sending out the establishment response by the second client equipment node after receiving the request and transmitting the inforamtion to the first client equipment node; and finishing the optical path establishment after the first client equipment node receives the resource distribution confirmation. Capable of establishing optical path fast in case of lacking of network resource, the method of the present invention is suitable for use in the next generation of autoamtic exchange optical network.

The present disclosure provides mesh restoration systems and methods with Optical Transport Network (OTN) links using a signaling and routing protocol, such as Optical Signaling and Routing Protocol (OSRP), Automatically Switched Optical Network (ASON), Generalized Multi Protocol Label Switching (GMPLS), and the like. The present invention includes an optical node, network, and method using the signaling and routing protocol for OTN lines of differing bandwidth granularities. The present invention utilizes OTN overhead for in-band signaling and may include capability for supporting SONET / SDH lines as well as OTN lines in the same system using the signaling and routing protocol.

This invention relates to a service / circuit protection and a recovery method by combining multiplex section protection and mesh recovery in an automatic exchange optical network, which is suitable for the combination of a linear multiplex section protection and a protection of two-fiber two-way multiplex section, shared protection ring and recovery of the mesh. In this method, the service / circuit are first automatically protected by the multiplex section protection method, that is to say applying linear multiplex section protection or two-fiber two-way multiplex section protection ring, when the multiplex section protection is unable to continue, the mesh recovery is started at once.

The method includes steps: (1) source node calculates routes of satisfying constrained condition for working route and protecting route respectively; (2) first, source node initiates signaling for building working route; when signaling reaches boundary node between domains of downstream network domain, the method calculates specific routes in this network domain of working route first, then builds connections in this domain of working route; (3) after working route point to point is built successfully, the source node initiates signaling for building protecting route; when signaling reaches boundary node between domains of downstream, the method asks boundary node between domains of working route for route information in this domain of working route; after obtaining response, the method calculates specific routes in this domain of protecting route and builds connections. Route information in a domain is shielded for other domain. The invention guarantees a straightway of communication.

The invention relates to a method for realizing load balancing based on synchronous digital hierarchy in an automatic switch optical network, which comprises: adopting multiple Dijkstra algorism to calculate a plurality of disjoint paths from a source node to a destination node; adopting a route calculation module to attain the available bandwidth of all chains contained in each disjoint path, adopting the minimum available bandwidth of all chains contained by each disjoint path as the maximum available bandwidth provided by the disjoint path, dividing the maximum available bandwidth of each disjoint path by the path index of the path to attain the load index of each disjoint path, and selecting a best path from a plurality of disjoint paths according to the load index. The load balancing method can reduce the service amount affected by accident network resource and can keep a certain redundancy in all resources in a network to provide protection and recovery for existed services, thereby reducing the failure rate of service protection and recovery.

The dynamic management method for ASON multicast business member comprises: based on original P2P business, by the advantage that ASON can automatic find network resource and topology, using resource pre-adding / pre-subtracting and multicast tree grafting / pruning techniques, calculating the optimal patch, and providing well-efficient point-to-multi-point communication connection. This invention is benefit to share bandwidth resource, and reduces total-patch cost.

The invention discloses a migrating method based on state transition in automatic exchange optical network, including: judging the value of a migrating status bit by setting migrating status bit in connection information field for identifying migrating operational state and combining information of signaling scene carried by standard signaling, so as to complete the mutual migrating between permanent connection and soft permanent connection. Application of the invention is smoothly compatible with the signaling deleted by general connections, does not make any changes to the signaling process. Standard RSVP-TE or CR-LDP signaling is differentiated to be deleted, or migrating SPC to PC and migrating PC to SPC according to the signaling scene values carried from the first nodes to downstream; whether the resource implementing authority is migrated or released is judged by strict state control, so as to ensure the false delete of resources after receiving delete signaling, and further to ensure that it is certainly PC after a migrating SPC to PC or migrating PC to SPC is in failure.

A method and system for multi-domain route computation. In the invention, Path Computation Elements (PCEs) are placed in different layers and computation domains between upper and lower layer PCEs are mapped so that a computation task is divided into multiple computation tasks layer by layer and that the multi-domain route computation is finally fulfilled. The invention separates route computation from signaling and runs route computation tasks in parallel. Route establishment is done by signaling after route computation. The present invention may realize route computation based on complex Traffic Engineering (TE) constraints and enable end-to-end diverse route computation. The invention places PCEs in layers, allowing good scalability and high computation efficiency. The present invention is applicable to the Automatically Switched Optical Network (ASON) and the Multi-Protocol Label Switched Network Traffic Engineering (MPLS-TE) network.

The invention provides a multi-layer multi-domain optical network-based dual-routing computing unit system. The dual-routing computing unit system comprises an individual computing unit set according to an automatic switching optical network routing module and a cluster computing unit set according to path computing unit technology, wherein the individual computing unit is used for providing routing information synchronization and basic path computing functions for controlling plane nodes to meet the requirements for intra-domain distributed routing; and the cluster computing unit is used for providing a complex restricted path computing function in the multi-layer multi-domain optical network to meet the requirements on intra-domain centralized routing and inter-domain the distributed routing. In the system structure of the invention, the individual computing unit and the cluster computing unit of the dual-routing computing unit system can work independently as well as cooperatively to reduce the flood processing of path computing information and to realize the effective routing of the multi-layer multi-domain optical network.

The present invention discloses link fault recover method for fault recovery among domain in automatic exchange optical network. Method includes determining upstream node and down stream node of link fault among domain, starting up link local fault recover, using said upstream node and down stream node as source host node to proceed link fault local recovery. The present invention can reduce domain link fault recovery time and convenient for to continue network resources programming.

The invention discloses an intercommunicating method between an automatically switched optical network and a traditional optical network, which comprises the following steps: a device domain of the traditional optical network is abstracted as a virtual node, and sending resources of the virtual node, that are corresponding to the device domain of the traditional optical network, are obtained; a control node is configured in a control plane and taken as a mapping of the virtual node in the control plane, and a network administration system is used for configuring the sending resources of the virtual node for the control node and deriving links for penetrating the virtual node according to the sending resources; and when a connection that is used for penetrating the device domain of the traditional optical network is built, the control plane can be used for realizing the integrated control of the whole network including the traditional optical network and the automatically switched optical network in the way of the automatically switched optical network. The intercommunicating method of the invention completely utilizes the control capacity of the ASON, lowers the complexity of network operation and management, and improves the intelligent property of the whole network.

In an automatically switched optical network operating according to a wavelength plan, the wavelengths are assigned to an optical path based on availability, performance and SRS wavelength coupling reduction. First, the wavelengths are grouped in static bins based on their reach versus cost performance, and each bin assumes a ΔQ of a middle wavelength. Then, the bins are moved into subsets of dynamic bins, constructed using bin constraints that account for the particulars of the respective optical path. The path is characterized taking into account the wavelength currently accessing at the end nodes, and the wavelength tandeming through the end nodes. Wavelength selection starts with the bins that satisfy the maximum number of constraints, and the wavelengths are checked sequentially against wavelength constraints; relaxed constraints are also applied when it is not possible to exactly satisfy one or more constraints.

The present invention discloses one kind of link management method for automatic exchange optical network. The automatic exchange optical network includes several nodes. The method includes the following steps: a) establishing the node adjoining relation; b) maintaining the node adjoining relation via transmitting the first message of preset protocol among nodes; and c) transmitting preset protocol message among node with adjoining relation in routing mode to manage the links. Compared with available technology, the present invention maintains the adjoining relation, rather than control passage, and has reduced message interaction, reduced system load and simple link management and maintenance.

The invention discloses a method of restoring a local span mesh network in an automatic switched optical network, which includes the following steps: when a service fails in a link, a link group of a span where the failure link is located is determined whether an idle link is existed or not, if so, the service is rearranged from the failure link to the idle link in the link group for transmission, and the restoration of the link is completed. The method embodies the flexibility of intelligent optical network protective restoration, has the characteristic of quick restoration without changing the prior linkage path, reestablishes a request by a source node to set up a new linkage when the local mesh network can not be restored, and particularly obviously improves the speed of network restoration when applied in a large scale network. The performance of the mode of local mesh restoration is better than that of the mode of nonlocal mesh restoration.

The present invention discloses a method for handling channel failures in an Automatically Switched Optical Network (ASON). When a channel alarm occurs, the head service node decides whether the channel alarm is incurred by a channel failure according to the alarm message or alarm information. If so, the head and end service nodes continue to locate whether the channel failure is inside or outside the network by combining local detection and message notification. If the channel failure is an internal failure, rerouting is activated to locate and remove the channel failure. When this method is used to locate a channel failure, the amount of information exchanged is small. The method may quickly identify the accurate position of a failure inside the network, improve the efficiency in removing failures, and minimize the damages to services, with little harm to equipment functioning and network performance.

The invention discloses a method for maintenance during the occurrence of alarms arising from services in an ASON system, which includes that: after a service is established successfully, a head node sets its own alarm surveillance and respectively requires a middle node and an end node to set alarm surveillances thereof; the middle node and the end node set respective alarm surveillance according to the requests of the head node; when alarms happen to the middle node and / or the end node, the alarm information affecting the service is notified to the head node; the head node institutes service maintenance strategies for the service according to the received alarm information, the alarm information from the head node and the protection and recovering strategies prearranged by the head node, and notified the end node of the service maintenance strategies; at last, the head node and the end node carry out related maintenance operation in line with the service maintenance strategies. Through peer-to-peer communications by information notification between any nodes of the service, the invention reaches the targets of transmitting alarm information quickly, reducing interruption or intermittent interruption of the service and reducing opportunities of remnant connections of transmission resources.

The present invention relates to a method for enhancing survivability of automatic switching optical network (ASON). Said method is characterized by that said invention utilizes the downstream node of damaged chain link to coordinate optical network resource distribution of damaged channel, solve the influence of optical network resource collision to network survivability in the course of chain link failure restoration and raise restoration successful rate. Said invention adopts a staged parallel restoration process so as to reduce connection creating time.

The present invention provides maintenance control plane accessibility information method in automatic exchange optical network. It contains in current structure basic, increasing one control plane accessibility information data base and one adjacency relation detect subfunction module to each node route control module; using adjacency relation detect subfunction module real time detecting local node and adjacent nodes adjacency relation variation; and in detecting variation generation, updating adjacency relation list in local adjacency relational data base, diffusing transmitting changed Adjacency node listing, realizing all control node Adjacency relational data base updating; synchronizing Adjacency relational data base and recalculating accessibility relation between node according to updated Adjacency relational data base, using calculative result as route querying constraint condition. The present invention can avoid route miscount duo to control node or control channel gone wrong, raising connection establishment success ratio and shortening connection establishment time.

In an automatically switched optical network operating according to a wavelength plan, the wavelengths are assigned to an optical path based on availability, performance and SRS wavelength coupling reduction. First, the wavelengths are grouped in static bins based on their reach versus cost performance, and each bin assumes a ΔQ of a middle wavelength. Then, the bins are moved into subsets of dynamic bins, constructed using bin constraints that account for the particulars of the respective optical path. The path is characterized taking into account the wavelength currently accessing at the end nodes, and the wavelength tandeming through the end nodes. Wavelength selection starts with the bins that satisfy the maximum number of constraints, and the wavelengths are checked sequentially against wavelength constraints; relaxed constraints are also applied when it is not possible to exactly satisfy one or more constraints.

The present invention discloses a method for handling channel failures in an Automatically Switched Optical Network (ASON). When a channel alarm occurs, the head service node decides whether the channel alarm is incurred by a channel failure according to the alarm message or alarm information. If so, the head and end service nodes continue to locate whether the channel failure is inside or outside the network by combining local detection and message notification. If the channel failure is an internal failure, rerouting is activated to locate and remove the channel failure. When this method is used to locate a channel failure, the amount of information exchanged is small. The method may quickly identify the accurate position of a failure inside the network, improve the efficiency in removing failures, and minimize the damages to services, with little harm to equipment functioning and network performance.