Siemens Aktiengesellschaft

Unify Gmbh Co. Kg

Continental Automotive Gmbh

Siemens Energy Global Gmbh & Co. Kg

Dragan Obradovic

Günter Steindl

Ruxandra Scheiterer

Philipp Wolfrum

Michael Bernhard Buhl

Chongning Na

Andrei Szabo

Per Egedal

Björn Andresen

Corinna Gottschalk

Justinian Rosca

Franz-Josef Götz

Steffen Lamparter

Michael Armbruster

Michael Stoettrup

Nikolaus Goldenbaum

Bo Yin

Tim Schenk

Andrés Botero Halblaub

Heiko Patzlaff

Guenter Steindl

Markus Schupfner

Henning Lenz

Torsten Mosis

Lutz-Wolfgang Tiede

Juergen Leimbach

Ulrich Münz

Manel Hammouda

Teachings herein include computer-implemented methods for scheduling transmissions of a plurality data streams through a telecommunication network. A respective repetitive transmission of each of the data streams is transmitted from a first originator node, in one or more of a plurality of phases according to a respective repetition rate of the respective repetitive transmission. The method may include: selecting the first originator node from a group of nodes; iterating over data streams of the plurality of streams whose repetitive transmission is transmitted from the first originator node; and at each iteration: selecting a data stream from the selected originator node, and assigning a phase of the plurality of phases to the selected stream based on a distribution criterion taking into account previously selected data streams and their assignment to a respective phase. The respective repetitive transmission of each stream is scheduled according to the respective phase.

Scheduling transmissions through a telecommunication network

Various embodiments of the teachings herein include a computer-implemented method for scheduling transmissions of a plurality of data streams in a telecommunication network. The transmissions are partitioned into transmission cycles with a predetermined length in time. Repetitive transmissions of each of the data streams are transmitted based on the predetermined length multiplied by a respective repetition rate. The method includes: determining a path through the network for the transmissions of each stream; determining a shared transmission links based on a comparison of the paths, wherein each shared transmission link is part of at least two of the paths; based on a numerical optimization, determining a phase of the repetitive transmissions for each data stream, the optimization using an objective function with a value for interference between two repetitive transmissions; and scheduling the transmissions of each data stream, wherein the transmissions start at a transmission cycle associated with the respective phase.

Interference reduction in telecommunication networks

Provided is a computer-implemented method for adapting at least one pre-defined frame delay, wherein the corresponding at least one frame is communicated via at least one network switch of at least one computing unit in a frame-based computer network, including the steps a. receiving input data from the at least one network switch of the at least one computing unit; wherein b. the input data includes at least one information associated with the at least one frame and/or at least one network switch; c. deriving at least one current frame delay of the at least one frame from the at least one information; d. adapting the at least one pre-defined frame delay depending on the at least one current frame delay; and e. providing the at least one adapted frame delay. Also provided is a corresponding computer program product and monitoring unit.

Computer-implemented method for adapting at least one pre-defined frame delay

A computer program and method for data communication in a network having a plurality of network nodes, via which method data packets are to be transferred between communication partners over protected connections, wherein the data packets originate from at least two different sending communication partners, or senders, and wherein the sending frequencies of at least two senders, at which the senders send data packets that are to be transferred over a protected connection, differ from one another, and the sending frequencies and/or variables representing same being taken into account when finding a path for the transfer of the data packets of at least one protected connection.

Computer program and method for data communication

The controlling method uses a control specification. In the method, at least part of the progression of the controlling process is monitored, and at least one quality criterion characterizing the quality of the control method is determined, (e.g., ascertained), in accordance with the progression. The control specification is adjusted in accordance with the quality criterion.

Controlling methods, control systems, and plants using semantic models for quality criteria or adaptation of control rules

A method for estimating grid properties of a power grid coupled to a generator at a point of common coupling is provided. First, a voltage Vat the point of common coupling is measured. Second, a current Iat the point of common coupling is measured. Third, the grid properties are estimated by a grid model using as input parameters the measured voltage Vat the point of common coupling, the measured current Iat the point of common coupling and the determined phase angle. Advantageously, the absolute phases of the voltage and the current at the point of common coupling are not necessary, which makes the present method less prone to errors due to measurement noise. Further, a device and a computer program product are provided.

Method and device for estimating grid properties of a power grid

One or a plurality of sub-networks are defined in the communications network. Each of the sub-networks includes a plurality of network nodes from the communications network. One or a plurality of the sub-networks represent pre-determined sub-networks, in which respective pre-determined network nodes have both the function of a global slave node and the function of a local master node. The one or the other network nodes of the respective pre-determined sub-networks are local slave nodes. In addition to global synchronization using the global master node and the global slave nodes, local synchronization is also performed in the pre-determined sub-networks using the local master node and the local slave nodes. Thus, in the event of an error outside a pre-determined sub-network, the local synchronization may be continued, whereas the global synchronization is aborted. It is thus avoided that an erroneous synchronization is propagated into corresponding sub-networks.

Time synchronization in a communications network with a plurality of network nodes

A wind turbine controller for controlling power production of a wind turbine is provided. The wind turbine is arranged within a wind farm coupled to a public power network via a point of common coupling. The wind turbine controller has a receiving unit for receiving a measured value of a property of the wind farm taken at the point of common coupling and for receiving a reference value for the property, and a control unit for controlling the power production of the wind turbine by regulating a local property of the wind turbine based on the received measured value and the received reference value such that the measured value of the wind farm taken at the point of common coupling corresponds to the reference value. Further, a wind turbine having such a controller, a wind farm and a method for controlling a power production of a wind turbine are provided.

Wind turbine controller and method for controlling a power production of a wind turbine

A method for time synchronization in a communication network comprising a multiplicity of network nodes, wherein synchronization messages are transmitted in the communication network and the synchronization message received in a slave node contains synchronization information for synchronizing the slave time of the slave node with the master time, i.e., synchronization messages are transmitted in a closed ring or line topology and the slave node receives first and second synchronization messages from different transmission directions, and wherein the slave node synchronizes a first time with the synchronization message from one transmission direction and a second time with the synchronization message from the other transmission direction.

Method for time synchronization in a communication network

Locating a frequency deviation in a communication network is provided. A node clock frequency is assigned to each internal clock of each network node. Messages are transmitted synchronizing the internal clocks. The synchronization messages are transmitted from one node to another in succession based on a reference clock frequency predefined by a reference clock. The synchronization messages include a reference clock count state of the reference clock. Synchronization deviations are calculated at predefined intervals of time. If the synchronization deviation of the middle network node exceeds a threshold value, a change in the reference clock frequency is detected if the synchronization deviations of adjacent nodes. Otherwise, a change in the node clock frequency of the middle network node is detected.

Method for locating a frequency deviation in a communication network, and corresponding communication network

A method for synchronizing clocks in a communication network includes a first clock of a first network element which is a master element is used for synchronizing second clocks of one or more second network dements which are slave elements. A first sequence of first messages transmitted from the first network element to the second network element and/or a second sequence of second messages transmitted from the second network element to the first network element is recorded. First messages and/or second messages out of those sequences are identified by using an appropriate threshold function with respect to the transmission delays of those messages. Those identified messages have the same constant minimum delay, and based on those messages clock synchronization between the first clock and the second clock is performed.

Method for synchronizing clocks in a communication network

A method for time synchronization in a communications network having multiple nodes, wherein the nodes comprise a first node and at least one second node, where the first node generates first cycle counter states according to a reference clock frequency and the second node or nodes each generate second cycle counter states according to an internal clock frequency, where a time synchronization is carried out in sequential synchronization cycles, in which synchronization messages originating from the first node are sequentially transmitted from one node to another node, and a synchronization message transmitted by a node contains information used for time synchronization in the at least one second node receiving the synchronization message such that a time synchronization is performed in a given second node based on an estimation of a first cycle counter state and a compensation factor in combination with a linear quadratic regulator.

Method for time synchronization in a communications network

Method, device and system for detecting a disturbance, e.g., at least one short mechanical impact (shock or vibration) on a clock of a slave device by detecting a non-typical variation of a tracking error, i.e., a tracking error having a deviation that exceeds a predetermined threshold, wherein such a non-typical variation can be determined by the deviation from a statistical measure, e.g., a variance or a standard deviation, such that the determination of the quality of a clock signal is advantageously allowed and thus suitable counter-measures are provided. The method, device and system are applicable for all kinds of technical systems comprising slave devices that have a clock, e.g., devices in industrial and automation systems. The method, device and system are also applicable in communication systems that use a protocol to synchronize the clocks of its devices, e.g., Profinet.

Method and device for determining a quality of a clock signal

A system and method for time synchronization in a communication network. The communication network includes a plurality of network nodes each having a respective internal clock, and a reference node having a reference clock and each configured transmits synchronization messages within the communication network. At least one network node is configured to determine an estimated reference clock time discretely upon arrival of a synchronization message at the at least one network node. To that end, the at least one network node includes a controller for determining a controlled time comprising a time-continuous estimate of the discreetly estimated reference clock time. The controller is configured to determine the controlled time based on an input that is extrapolated to an execution time instant of the controller, where the execution time instant is separated from the time instant of arrival of the synchronization message by a delay (&#x394;t).

System and method for time synchronization in a communication network

The invention refers to a method for synchronizing clocks in a communication network, wherein a first clock of a first network element (MA) which is a master element is used for synchronizing second clocks of one or more second network elements which are slave elements. According to the method of the invention, a first sequence of first messages transmitted from the first network element to the second network element and/or a second sequence of second messages transmitted from the second network element to the first network element is recorded. First messages and/or second messages out of those sequences are identified by using an appropriate threshold function with respect to the transmission delays of those messages. Those identified messages have the same constant minimum delay, and based on those messages clock synchronization between the first clock and the second clock is performed. The invention has the advantage that clock synchronization is possible even if an intermediate switch causing an unknown delay is located in the transmission path between the first and the second network element. This is because most of the messages are transmitted within a minimum constant delay via such an intermediate switch and, by identifying those messages, a line delay between the first network element and second network element can be estimated and used for synchronizing the second clock with the first clock. The synchronization method of the invention is preferably used for synchronizing clocks in a DECT network. Furthermore, in a preferred embodiment, the first and second messages are messages according to the standard IEEE 1588.

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Ottobrunn, Germany

Dragan Obradovic