79 results about "Traffic engineer" patented technology

A system and method for introducing a loopback capability for Multi-Protocol Label Switching (MPLS) bi-directional traffic trunks are discussed. MPLS is an emerging technology, which integrates Internet Protocol (IP) routing with label switching techniques. MPLS intends to provide new capabilities in the area of traffic engineering for IP networks. These traffic engineering capabilities will have to be combined with a set of complementary operation, administration and maintenance (OA&M) functions for effectively managing and operating MPLS-based networks. One such function is loopback. A loopback function provides the capability to transmit a OA&M packet on one or more segments of a bi-directional traffic trunk (BTT) in a MPLS network. Using a loopback function, parameters of a BTT, such as connectivity, delay and other Quality of Service (QoS) parameters, can be tested. The system and method provide different techniques for implementing loopback in an MPLS network.

Embodiments of the disclosure are directed to tunnel flap damping in a traffic engineered network. One exemplary method for tracking a re-routing history of Multi-Protocol Label Switching (“MPLS”)/Generalized MPLS (“GMPLS”) tunnels over intervals includes measuring a number of policy-based re-routes during at least one measurement interval; determining a tunnel re-route frequency based on the measurement; comparing the tunnel re-route frequency to a frequency threshold; and determining if the tunnel re-route frequency exceeds the frequency threshold and, if the tunnel re-route frequency exceeds the frequency threshold, delaying at least one tunnel re-route.

A method of controlling traffic forwarding in a Provider Backbone-Traffic Engineered (PBB-TE) network. A protection group (PG) is defined, and including N working Traffic Engineered Service Instances (TESIs) and M protection TESIs. An Automatic Protection Switching Protocol Data Unit (APS PDU) is defined, which includes information defining at least a state of the protection group. This APS PDU is forwarded only through the protection TESI(s).

An approach is provided for auto-bandwidth adjusting bandwidth allocations for traffic-engineered tunnels used to carry traffic along a network. Traffic over the tunnel is sampled at a first interval period and at a second interval period, where the second interval period is shorter than the first interval period. A determination is made as to whether the sampled traffic taken using the second interval period is greater than the bandwidth allocation, and the bandwidth allocation is adjusted upward based upon a determination that the sampled traffic taken using the second interval period is greater than the bandwidth allocation. Also, a determination can be made as to whether the sampled traffic taken using the first interval period is less than the bandwidth allocation, and the bandwidth allocation can be adjusted downward based upon a determination that the sampled traffic taken using the first interval period is less than the bandwidth allocation.

The invention discloses a joggle joint type bearing rail beam structure for a middle and low-speed magnetic suspension traffic engineering low line. The joggle joint type bearing rail beam structure comprises reinforced concrete supporting structures; each reinforced concrete supporting structure comprises a reinforced concrete girder structure and a reinforced concrete bottom plate; each reinforced concrete bottom plate comprises a bottom plate main body structure, a tenon and a mortise; round corners are arranged on each tenon and each mortise, so that the tenon can rotate in the mortise, therefore, the adjacent two reinforced concrete bottom plates can rotate relative to each other, and further, the reinforced concrete girder structures borne by the two reinforced concrete bottom plates can also rotate relative to each other. According to the joggle joint type bearing rail beam structure disclosed by the invention, as the tenons and the mortises are arranged to form tenon connection, settlement and dislocation caused between the adjacent reinforced concrete girder structures due to different foundation treatment measures are avoided, so that the smoothness requirements for a magnetic suspension traffic engineering overhead structure and a low line transition section F rail are effectively satisfied.

The invention discloses a medium and low speed maglev traffic engineering low line curve rail bearing beam structure comprising a rail bearing beam, a sleeper pedestal fixed to the top of the rail bearing beam, a rail section fixed to the top of the sleeper pedestal, a reinforcement concrete base plate fixed to the interarea of the horizontal ground and guide rails arranged on two sides of the rail bearing beam; the top surface of the reinforcement concrete base plate is arranged obliquely corresponding to the level, the included angle between the top surface of the reinforcement concrete base plate and the level is alpha q, the bottom of the rail bearing beam is fixedly connected to the top of the reinforcement concrete base plate, the axle of the rail bearing beam, sleeper pedestal and rail section are perpendicular to the top surface of the reinforcement concrete base plate, the included angle between the central line of the rail section and the central line of the line is alpha, and alpha 1 = alpha. By the aid of the structure, the installation requirements for a maglev vehicle contacting with the rail can be met, the construction difficulty of soil engineering base below the rail bearing beam is not raised, and the long-term stability is not reduced.

A handover management device (D1) is intended for a broadband wireless access network (AN) comprising a plurality of base stations (BS1-BS6) to which communication equipments (CE1-CE7) may be connected to. This device (D1) is arranged, when it receives, from either a base station (BS1) or a communication equipment (CE2) connected to this base station (BSi), an alarm message signalling either i) a degradation of at least one decision metric, representative either of the quality of a signal transmitted between this connected communication equipment (CE2) and this base station (BS1) or of a quality of service offered by this base station (BS1) to this connected communication equipment (CE2), or ii) an overload of this base station (BS1), for triggering a handover assisted either by this connected communication equipment (CE2) and possibly this base station (BS1) and involving a target base station (BS2) to be selected, or by a selected target communication equipment (CE5) and this base station (BS1) and involving a target base station (BS2) to be selected.

Interworking an Ethernet Ring network with an Ethernet network with traffic engineered trunks (PBT network) enables traffic engineered trunks to be dual homed to the Ethernet ring network to enable for protection switching between active and backup trunk paths in the PBT network. In one embodiment, the active path will terminate at a first bridge node on the Ethernet ring network and the backup path will terminate at a second bridge node on the Ethernet ring network. Trunk state information is exchanged between the bridge nodes to enable the bridge nodes to determine which of the active and backup paths should be used to forward data on the trunk. Upon a change in trunk state, a flush message is transmitted on the Ethernet ring network to enable the nodes on the Ethernet ring network to relearn the path to the new responsible bridge node.

A distributed path computation element based system in a multi-layer network. The system comprises at least one higher-layer path computation element, and at least one lower-layer path computation element, adapted to provide dynamic multi-layer path computations; at least one higher-layer traffic engineering database, and at least one lower-layer traffic engineering database, adapted to provide multi-layer traffic engineering label switched paths, while maintaining layer-specific traffic engineered database in a distributed fashion; and at least one path computation element agent, adapted to provide static optical layer path provisioning, and reconfiguration of optical layer label switched paths in cooperation with the at least one lower-layer path computation element.

The invention discloses an urban rail traffic engineering civil air defense system which comprises a building subsystem, a structure subsystem, an air subsystem, a water subsystem and an electronic subsystem, wherein a civil air defense ventilation subsystem is composed of an air shaft, a ventilation channel communicating an underground station main body structure and the air shaft, and a station environmental controlling device arranged in the underground station main body structure; the ventilation channel is composed of a clean type air inlet duct, a clean type air exhaust duct, an isolated type air inlet duct and an isolated type air exhaust duct, part of a clean type air duct protecting section is arranged in the clean type air inlet duct and the clean type air exhaust duct, part of an isolated air duct protecting section is arranged inside the isolated type air inlet duct and the isolated type air exhaust duct, the clean type air inlet duct, the clean air exhaust duct, the isolated type air inlet duct and the isolated type air exhaust duct are communicated with the station environmental controlling device, and the station environmental controlling device is composed of a clean type air inlet device, an isolated type air inlet device, a clean type air outlet device and an isolated type air outlet device. The urban rail traffic engineering civil air defense system has the functions of ensuring staff safe traffic, transferring and cargo transportation, and is good in ventilation performance.

Techniques are described for detecting failure or degradation of a service enabling technology function independent from an operational state of a service node hosting the service enabling technology function. For example, a service node may provide one or more service enabling technology functions, and service engineered paths may be traffic-engineered through a network to service node network devices that host a service enabling technology function. A monitor component at the service layer of the service node can detect failure or degradation of one or more service enabling technology functions provided by the service node. The monitor component reports detection of failure or degradation to a fault detection network protocol in a forwarding plane of the service node. The fault detection network protocol communicates with an ingress router of a service engineered path to trigger fast reroute by the ingress of traffic flows to bypass the affected service enabling technology function.

The invention discloses a path calculation method of a loose node in an RSVP-TE (Resource Reservation Protocol-Traffic Engineer) tunnel, the loose node, a non-loose node and the RSVP-TE network. The method comprises the following steps that: each node in the RSVP-TE network sends a PATH message carrying the router ID (Identifier) of the node to a downstream node; when the path of the loose node is calculated, the router ID is used as a constraint condition of path exclude to submit to CSPF (Constrained Shortest Path First) to calculate the path. The loose node comprises a receiving module, a path calculation module and a message generating module; the non-loose node comprises a message generating module and a sending module; and the RSVP-TE network comprises the loose node and the non-loose node. The local router ID of an upstream node is used as a constraint condition of the path exclude, so that the possibility of a loop generated when the path of the loose node is calculated is greatly reduced.

The preset invention discloses a plane intersection left turn waiting area setting evaluation method, and relates to the field of traffic organization design of urban road intersections. The method comprising following steps: Step 1, through investigating a left-turn traffic flow, evaluating whether setting a left-turn waiting area is required; Step 2: through calculating length of the left-turn waiting area, deterining whether the left-turn waiting area can be set; Step 3: through drawing a left-turning vehicle driving track, determining whether the left turn waiting area can be set; step 4,through a signal control setting mode, determining whether the left turn waiting area can be set. Compared with past where senior transportation engineers are required to determine through experience,the method confirms implementation effect through a large number of data surveys, the evaluation method is more scientific and reasonable, reduces manpower and material resources.

A system and method for providing multi-topology support in RSVP-TE in a multi-protocol label switching network is provided. A method includes reserving path states for a traffic engineered label switched path (TE LSP), and releasing the reserved path states. The TE LSP is established within a single network topology in an environment of multiple network topologies, and the reserving path states includes sending a first resource reservation protocol with traffic engineering (RSVP-TE) message containing multi-topology information.

Methods and network devices are disclosed for failure protection in traffic-engineered bit indexed explicit replication networks. In one embodiment, a method includes receiving at a node in a network a message comprising a message bit array, where bit positions in the message bit array correspond to respective links in the network. The method further includes evaluating a bit value at a bit position in the message bit array, where the bit position corresponds to a network link represented in a forwarding table for the node, checking for a failure state of the link represented in the forwarding table, and, responsive to a determination of a failure state of the link, modifying one or more bit values in the message bit array. In one embodiment a network device includes a network interface, a memory configured to store a forwarding table, and a processor configured to carry out the methods.

The invention belongs to the field of bearing-trail beams and discloses a medium and low speed maglev traffic engineering low line solid bearing-trail beam structure; the bearing-trail beam structure comprises a reinforced concrete base plate, reinforced concrete solid beams, multiple rows of rail bearing pedestals, a track panel, and guide rail supports; the reinforced concrete solid beam is integrated on the reinforced concrete base plate; the reinforced concrete solid beams are arranged in the line direction in sections and an expansion joint is arranged between adjacent reinforced concrete solid beams; tops of the reinforced concrete solid beams are provided with the multiple rail bearing pedestals; beam grooves are uniformly installed at a left side and a right side of each reinforced concrete solid beam; multiple guide rail supports are installed at the left side and the right side of each reinforced concrete solid beam. The medium and low speed maglev traffic engineering low line solid bearing-trail beam structure has large rigidity and strong anti-deformation ability which can be prepared by cast-in-situ or prefabrication and lifting; the structure and construction process are simple; the construction precision is easy to control.

Traffic Engineered (TE) paths may be created over a link state protocol controlled Ethernet network by causing explicit paths to be installed by network elements on the link state protocol controlled Ethernet network and used to forward traffic on the network. The network elements exchange routing information using link state advertisements to enable each node on the network to build a link state database that may be used to determine shortest paths through the network. The shortest paths are used as a default forwarding state for traffic that is not associated with one of the traffic engineered paths. The link state advertisements 'may also be used to carry the TE path definitions. Where the TE paths are to be used exclusive of other routes, forwarding state for particular service instances may be removed to prevent traffic from traversing the network other than over the TE path.