Abstract: A method and apparatus for providing point-to-multipoint label switch paths (LSPs) in a Multi-Protocol Label Switching (MPLS) network is described. In one embodiment, a point-to-multipoint LSP is built in a MPLS network by using Resource Reservation Protocol Traffic Engineering (RSVP-TE) to signal the point-to-multipoint LSP as separate point-to-point LSPs and to merge the separate point-to-point LSPs into the point-to-multipoint LSP.

Abstract: Providing a multicast service to a mobile node includes receiving a first request to join a multicast group from a first cell site. The first request requests that a first mobile node be permitted to join the multicast group. A first multicast source operable to provide content to the first mobile node is identified. The multicast group and the first multicast source are associated to yield a first group-source combination. A first key is assigned to the first group-source combination, and the first key is provided to the first cell site.

Abstract: A method and apparatus for providing point-to-multipoint label switch paths (LSPs) in a Multi-Protocol Label Switching (MPLS) network is described. In one embodiment, a point-to-multipoint LSP is built in a MPLS network by using Resource Reservation Protocol Traffic Engineering (RSVP-TE) to signal the point-to-multipoint LSP as separate point-to-point LSPs and to merge the separate point-to-point LSPs into the point-to-multipoint LSP.

Abstract: Providing a multicast service to a mobile node includes receiving a first request to join a multicast group from a first cell site. The first request requests that a first mobile node be permitted to join the multicast group. A first multicast source operable to provide content to the first mobile node is identified. The multicast group and the first multicast source are associated to yield a first group-source combination. A first key is assigned to the first group-source combination, and the first key is provided to the first cell site.

Abstract: A test monitoring device for detecting a fault in a multicast routing infrastructure includes a processor, a memory coupled with the processor, and a network interface coupled with the processor. The device is configured to send a source configuration request for configuring a device in the infrastructure to be a test packet source, and a receiver configuration request for configuring one or more devices in the infrastructure to be test packet receivers where the test packet source sends out test packets to a predetermined group of test packet receivers. The source configuration request contains an identifier identifying the test monitoring device. The predetermined group has a group identifier. The device is also configured to examine data reports from the test packet receivers relating to a plurality of test packets sent by the test packet source.

Abstract: A method and apparatus for providing point-to-multipoint label switch paths (LSPs) in a Multi-Protocol Label Switching (MPLS) network is described. In one embodiment, a point-to-multipoint LSP is built in a MPLS network by using Resource Reservation Protocol Traffic Engineering (RSVP-TE) to signal the point-to-multipoint LSP as separate point-to-point LSPs and to merge the separate point-to-point LSPs into the point-to-multipoint LSP.

Abstract: Protocols for messaging between a centralized network management system and other entities are described. According to one embodiment, in response to a request of a subscriber for joining a multicast group received at a centralized aggregation server, the centralized aggregation server transmits a port subscriber announcement (PSA) message to substantially all subscriber access multiplexers over an access network. The PSA message includes an identifier (ID) of the subscriber. In response to the PSA message, a subscriber access multiplexer having a subscriber matching the ID of the subscriber in the PSA message identifies a user port corresponding to the subscriber and applies a local service policy to the identified user port.

Abstract: A method and system for detecting faults in data packet routing devices in a computer network capable of routing messages using a multicast protocol is described. Faults in devices, such as routers and switches, are detected in near real-time when using a multicast routing infrastructure by configuring a device to be a sender or source of test data packets and one or more other devices to receive test data packets. The test packet sender transmits test data packets to a test group of test packet receivers where the test group has a group identifier. The test receivers prepare data or fault reports describing errors regarding missing or duplicated data packets. These fault reports are prepared soon after the errors are detected and sent back to a multicast routing manager for isolating the device causing the fault. The messages sent to the test devices contain instructions regarding time intervals during which fault reports can be sent to the multicast routing manager from the multiple test receivers.

Abstract: A device controls the torque of an asynchronous electric motor by controlling the phase of the motor stator voltage relative to a motor flux on the basis of a set point for the quadrature component of the stator current in a frame of reference related to the flux in turn derived from the motor torque set point. The device includes a first difference detector for detecting any difference between the set point and the current value of the quadrature component and a first regulator operating on the basis of the difference to provide the phase value to be applied to the motor to reduce the difference.

Abstract: A method is provided for asynchronous motor control by closed-loop variation of magnetic induction flux as a function of a desired value in which the closed-loop variation includes flux measurement on the basis of measurement of motor voltage and current and determination of a measured flux value obtained using said measurements and characteristic parameters of said motor in accordance with the motor operating equations, the method including the steps of obtaining the measured flux for an arbitrarily fixed value of at least one of said parameters wich may significantly differ from the actual value thereof and of then correcting the desired value in order to compensate for this possible difference.

Abstract: A method and device are provided for estimating the magnetic induction flux of an asynchronous electric motor, notably for enabling said motor to be controlled by magnetic induction flux regulation, the method consisting of measuring the motor voltage and current, calculating a flux, defining a measured flux, using the operating equations for said motor and employing said measured values and predetermined values for characteristic parameters of said motor, one of which at least, being fixed arbitrarily, may differ considerably from the actual value thereof, and on the basis of said measured flux, calculating a flux defined as the estimated flux and which can be identified with the actual flux through the use of an expression deduced from said motor operating equations as a function of said measured flux, and from characteristic parameters of said motor other than said parameter having a arbitrarily fixed value which may differ considerably from said actual value, and if necessary from said voltage or current