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1. 发明授权

US08670491B2 Device and method for time synchronization in a communication network 有权
标题翻译：通信网络中时间同步的装置和方法
公开(公告)号：US08670491B2
公开(公告)日：2014-03-11
申请号：US12882940
申请日：2010-09-15
申请人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Guenter Steindl , Philipp Wolfrum
发明人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Guenter Steindl , Philipp Wolfrum
IPC分类号： H04L27/00
CPC分类号： H04J3/0664 , H04J3/0673
摘要： A device and method for time synchronization in a communication network, wherein a virtual clock is produced by a controller in each network node based on the PROFINET-Standard and/or the Precision Transparent Clock Protocol. In contrast to known methods for estimating the time, the time of the virtual clock does not undergo sudden changes. The virtual clock includes a controlled, continuous path. As a result, the virtual clock is particularly suitable for time-critical applications. Here, the estimation of the time of a reference clock is improved by 18-35%. Accordingly, a markedly greater number of network nodes may be synchronized with a predetermined level of accuracy for the time synchronization.
摘要翻译：一种用于通信网络中的时间同步的装置和方法，其中虚拟时钟由每个网络节点中的控制器基于PROFINET-Standard和/或精确透明时钟协议产生。与用于估计时间的已知方法不同，虚拟时钟的时间不会发生突然变化。虚拟时钟包括受控的连续路径。因此，虚拟时钟特别适用于时间关键的应用。这里，参考时钟的时间估计提高了18-35％。因此，可以将数量较多的网络节点与用于时间同步的预定精度水平同步。

2. 发明申请

US20110064177A1 Device and Method for Time Synchronization in a Communication Network 有权
标题翻译：通信网络中时间同步的设备和方法
公开(公告)号：US20110064177A1
公开(公告)日：2011-03-17
申请号：US12882940
申请日：2010-09-15
申请人： Chongning NA , Dragan Obradovic , Ruxandra Scheiterer , Guenter Steindl , Philipp Wolfrum
发明人： Chongning NA , Dragan Obradovic , Ruxandra Scheiterer , Guenter Steindl , Philipp Wolfrum
IPC分类号： H04L7/00
CPC分类号： H04J3/0664 , H04J3/0673
摘要： A device and method for time synchronization in a communication network, wherein a virtual clock is produced by a controller in each network node based on the PROFINET-Standard and/or the Precision Transparent Clock Protocol. In contrast to known methods for estimating the time, the time of the virtual clock does not undergo sudden changes. The virtual clock includes a controlled, continuous path. As a result, the virtual clock is particularly suitable for time-critical applications. Here, the estimation of the time of a reference clock is improved by 18-35%. Accordingly, a markedly greater number of network nodes may be synchronized with a predetermined level of accuracy for the time synchronization.
摘要翻译：一种用于通信网络中的时间同步的装置和方法，其中虚拟时钟由每个网络节点中的控制器基于PROFINET-Standard和/或精确透明时钟协议产生。与用于估计时间的已知方法不同，虚拟时钟的时间不会发生突然变化。虚拟时钟包括受控的连续路径。因此，虚拟时钟特别适用于时间关键的应用。这里，参考时钟的时间估计提高了18-35％。因此，可以将数量较多的网络节点与用于时间同步的预定精度水平同步。

3. 发明申请

US20120320902A1 Method for Time Synchronization in a Communication Network 审中-公开
标题翻译：通信网络中时间同步的方法
公开(公告)号：US20120320902A1
公开(公告)日：2012-12-20
申请号：US13578800
申请日：2010-12-29
申请人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Philipp Wolfrum
发明人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Philipp Wolfrum
IPC分类号： H04W56/00
CPC分类号： G06F1/14 , H04J3/0664 , H04J3/0673
摘要： A method for time synchronization in a communication network having a plurality of nodes each comprising a first node and at least one second node, wherein the first node generates first cycle counting states according to a reference cycle frequency and the second node generates second cycle counting states according to an internal cycle frequency, wherein time synchronization is performed in consecutive synchronization cycles in which, starting from the first node, synchronization messages are consecutively transferred from one node to a further node and a synchronization message transmitted by the node includes a segment of information that is used for time synchronization in the node receiving the synchronization message, wherein time synchronization is performed in the second node based on an estimate of a first cycle counting state in combination with a linear-quadratic regulator to obtain a synchronized time comprising a controlled first cycle counting state.
摘要翻译：一种用于具有多个节点的通信网络中的时间同步的方法，每个节点各自包括第一节点和至少一个第二节点，其中所述第一节点根据参考周期频率产生第一周期计数状态，并且所述第二节点生成第二周期计数状态根据内部周期频率，其中在连续同步周期中执行时间同步，其中从第一节点开始，同步消息从一个节点连续传送到另一个节点，并且由节点发送的同步消息包括一段信息其被用于接收同步消息的节点中的时间同步，其中基于与线性二次调节器结合的第一周期计数状态的估计在第二节点中执行时间同步，以获得包括受控的第一循环计数状态。

4. 发明授权

US09288037B2 Method for time synchronization in a communications network 有权
标题翻译：通信网络中时间同步的方法
公开(公告)号：US09288037B2
公开(公告)日：2016-03-15
申请号：US13825532
申请日：2011-09-01
申请人： Dragan Obradovic , Ruxandra Scheiterer , Philipp Wolfrum , Günter Steindl
发明人： Dragan Obradovic , Ruxandra Scheiterer , Philipp Wolfrum , Günter Steindl
IPC分类号： H04L7/04 , H04J3/06
CPC分类号： H04L7/04 , H04J3/0667 , H04J3/0673
摘要： 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.
摘要翻译：一种用于具有多个节点的通信网络中的时间同步的方法，其中所述节点包括第一节点和至少一个第二节点，其中所述第一节点根据参考时钟频率产生第一周期计数器状态，并且所述第二节点或每个节点生成第二周期计数器根据内部时钟频率进行状态，其中在顺序同步周期中执行时间同步，其中从第一节点发起的同步消息从一个节点顺序发送到另一个节点，以及由节点发送的同步消息包含用于接收同步消息的至少一个第二节点中的时间同步的信息，使得基于第一周期计数器状态的估计和与线性二次调节器的组合的补偿因子在给定的第二节点中执行时间同步。

5. 发明申请

US20110161524A1 METHOD FOR SYNCHRONIZING CLOCKS IN A COMMUNICATION NETWORK 有权
标题翻译：在通信网络中同步时钟的方法
公开(公告)号：US20110161524A1
公开(公告)日：2011-06-30
申请号：US13054639
申请日：2008-09-02
申请人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer
发明人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer
IPC分类号： G06F15/16
CPC分类号： H04W56/0015 , H04J3/0667
摘要： 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 dements 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.
摘要翻译：本发明涉及一种用于同步通信网络中的时钟的方法，其中作为主元件的第一网元（MA）的第一时钟用于同步作为从元件的一个或多个第二网络因素的第二时钟。根据本发明的方法，记录从第一网络元件发送到第二网络元件的第一序列的第一序列和/或从第二网络元件发送到第一网络元件的第二个第二消息序列。通过使用关于这些消息的传输延迟的适当的阈值函数来识别这些序列中的第一消息和/或第二消息。这些识别的消息具有相同的恒定的最小延迟，并且基于这些消息执行第一时钟和第二时钟之间的时钟同步。本发明的优点在于，即使引起未知延迟的中间交换机位于第一和第二网络元件之间的传输路径中，时钟同步也是可能的。这是因为大多数消息通过这样的中间交换机在最小的恒定延迟内传输，并且通过识别这些消息，可以估计第一网络元件和第二网络元件之间的线路延迟并将其用于使第二时钟与第一时钟本发明的同步方法优选地用于同步DECT网络中的时钟。此外，在优选实施例中，第一和第二消息是根据标准IEEE 1588的消息。

6. 发明授权

US07848360B2 Method for transmitting synchronization messages in a communication network 有权
标题翻译：用于在通信网络中发送同步消息的方法
公开(公告)号：US07848360B2
公开(公告)日：2010-12-07
申请号：US12231660
申请日：2008-09-04
申请人： Franz-Josef Götz , Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Günter Steindl
发明人： Franz-Josef Götz , Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Günter Steindl
IPC分类号： H04J3/06
CPC分类号： H04J3/0664 , H04J3/0673
摘要： There is described a method for transmitting synchronization messages in a communication network, the communication network comprising a plurality of network nodes communicating with one another, each containing an internal clock, which is timed with a node clock frequency assigned to the respective network node. The synchronization messages transmitted in the communication network serve to synchronize the times of the internal clocks of the network nodes and contain the pulse counter status of a synchronization clock operating at a predefined synchronization clock frequency. The pulse counter status is estimated by each network node and updated in the synchronization message. Changes in the synchronization clock frequency are taken into account when estimating the pulse counter status. Precise determination of the pulse counter status is achieved with the aid of an approximation of the change over time in the pulse ratio between synchronization clock frequency and node clock frequency by means of a function, with the result that the pulse ratio on transmission of a new synchronization message can be predicted and a precise current pulse counter status can be determined on the basis of the predicted pulse ratio. The method is particularly suitable for use in a communication network of an industrial automation system, whose components communicate with one another for example according to the Profinet standard.
摘要翻译：描述了一种用于在通信网络中发送同步消息的方法，所述通信网络包括彼此通信的多个网络节点，每个网络节点包含内部时钟，所述内部时钟以分配给相应网络节点的节点时钟频率进行定时。在通信网络中发送的同步消息用于同步网络节点的内部时钟的时间并且包含以预定的同步时钟频率操作的同步时钟的脉冲计数器状态。脉冲计数器状态由每个网络节点估计并在同步消息中更新。在估计脉冲计数器状态时，会考虑同步时钟频率的变化。借助于通过功能在同步时钟频率和节点时钟频率之间的脉冲比随时间变化的近似来实现脉冲计数器状态的精确确定，结果是新传输的脉冲比可以预测同步消息，并且可以基于预测脉冲比确定精确的当前脉冲计数器状态。该方法特别适用于工业自动化系统的通信网络，工业自动化系统的组件例如根据Profinet标准彼此通信。

7. 发明申请

US20090086766A1 Method for transmitting synchronization messages in a communication network 有权
标题翻译：用于在通信网络中发送同步消息的方法
公开(公告)号：US20090086766A1
公开(公告)日：2009-04-02
申请号：US12231660
申请日：2008-09-04
申请人： Franz-Josef Gotz , Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Gunter Steindl
发明人： Franz-Josef Gotz , Chongning Na , Dragan Obradovic , Ruxandra Scheiterer , Gunter Steindl
IPC分类号： H04J3/06
CPC分类号： H04J3/0664 , H04J3/0673
摘要： There is described a method for transmitting synchronization messages in a communication network, the communication network comprising a plurality of network nodes communicating with one another, each containing an internal clock, which is timed with a node clock frequency assigned to the respective network node. The synchronization messages transmitted in the communication network serve to synchronize the times of the internal clocks of the network nodes and contain the pulse counter status of a synchronization clock operating at a predefined synchronization clock frequency. The pulse counter status is estimated by each network node and updated in the synchronization message. Changes in the synchronization clock frequency are taken into account when estimating the pulse counter status. Precise determination of the pulse counter status is achieved with the aid of an approximation of the change over time in the pulse ratio between synchronization clock frequency and node clock frequency by means of a function, with the result that the pulse ratio on transmission of a new synchronization message can be predicted and a precise current pulse counter status can be determined on the basis of the predicted pulse ratio. The method is particularly suitable for use in a communication network of an industrial automation system, whose components communicate with one another for example according to the Profinet standard.
摘要翻译：描述了一种用于在通信网络中发送同步消息的方法，所述通信网络包括彼此通信的多个网络节点，每个网络节点包含内部时钟，所述内部时钟以分配给相应网络节点的节点时钟频率进行定时。在通信网络中发送的同步消息用于同步网络节点的内部时钟的时间并且包含以预定的同步时钟频率操作的同步时钟的脉冲计数器状态。脉冲计数器状态由每个网络节点估计并在同步消息中更新。在估计脉冲计数器状态时，会考虑同步时钟频率的变化。借助于通过功能在同步时钟频率和节点时钟频率之间的脉冲比随时间变化的近似来实现脉冲计数器状态的精确确定，结果是新传输的脉冲比可以预测同步消息，并且可以基于预测脉冲比确定精确的当前脉冲计数器状态。该方法特别适用于工业自动化系统的通信网络，工业自动化系统的组件例如根据Profinet标准彼此通信。

8. 发明授权

US08700805B2 Method for synchronizing clocks in a communication network 有权
标题翻译：用于在通信网络中同步时钟的方法
公开(公告)号：US08700805B2
公开(公告)日：2014-04-15
申请号：US13054639
申请日：2008-09-02
申请人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer
发明人： Chongning Na , Dragan Obradovic , Ruxandra Scheiterer
IPC分类号： G06F15/16
CPC分类号： H04W56/0015 , H04J3/0667
摘要： 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.
摘要翻译：本发明涉及一种用于同步通信网络中的时钟的方法，其中作为主元件的第一网络元件（MA）的第一时钟用于同步作为从属元件的一个或多个第二网络元件的第二时钟。根据本发明的方法，记录从第一网络元件发送到第二网络元件的第一序列的第一序列和/或从第二网络元件发送到第一网络元件的第二个第二消息序列。通过使用关于这些消息的传输延迟的适当的阈值函数来识别这些序列中的第一消息和/或第二消息。这些识别的消息具有相同的恒定的最小延迟，并且基于这些消息执行第一时钟和第二时钟之间的时钟同步。本发明的优点在于，即使引起未知延迟的中间交换机位于第一和第二网络元件之间的传输路径中，时钟同步也是可能的。这是因为大多数消息通过这样的中间交换机在最小的恒定延迟内传输，并且通过识别这些消息，可以估计第一网络元件和第二网络元件之间的线路延迟并将其用于使第二时钟与第一时钟本发明的同步方法优选地用于同步DECT网络中的时钟。此外，在优选实施例中，第一和第二消息是根据标准IEEE 1588的消息。

9. 发明授权

US08913633B2 System and method for time synchronization in a communication network 有权
标题翻译：通信网络中时间同步的系统和方法
公开(公告)号：US08913633B2
公开(公告)日：2014-12-16
申请号：US13216831
申请日：2011-08-24
申请人： Dragan Obradovic , Ruxandra Scheiterer , Günter Steindl , Philipp Wolfrum
发明人： Dragan Obradovic , Ruxandra Scheiterer , Günter Steindl , Philipp Wolfrum
IPC分类号： H04L7/00 , H04J3/06 , H04L7/08
CPC分类号： H04J3/0697 , H04J3/0664 , H04J3/0682 , H04L7/08
摘要： 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 (Δtdelay).
摘要翻译：一种通信网络中时间同步的系统和方法。通信网络包括多个网络节点，每个节点具有相应的内部时钟，并且具有参考时钟的参考节点，并且每个被配置的参考节点在通信网络内传送同步消息。至少一个网络节点被配置为在至少一个网络节点处同步消息到达时确定离散地估计的参考时钟时间。为此，该至少一个网络节点包括用于确定受控时间的控制器，该控制时间包括谨慎估计的参考时钟时间的时间连续估计。控制器被配置为基于外推到控制器的执行时刻的输入来确定受控时间，其中执行时刻与同步消息的到达时刻相隔延迟（＆Dgr; tdelay）。

10. 发明申请

US20130182806A1 Method for Time Synchronization in a Communications Network 有权
标题翻译：通信网络中时间同步的方法
公开(公告)号：US20130182806A1
公开(公告)日：2013-07-18
申请号：US13825532
申请日：2011-09-01
申请人： Dragan Obradovic , Ruxandra Scheiterer , Philipp Wolfrum , Günter Steindl
发明人： Dragan Obradovic , Ruxandra Scheiterer , Philipp Wolfrum , Günter Steindl
IPC分类号： H04L7/04
CPC分类号： H04L7/04 , H04J3/0667 , H04J3/0673
摘要： 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.
摘要翻译：一种用于具有多个节点的通信网络中的时间同步的方法，其中所述节点包括第一节点和至少一个第二节点，其中所述第一节点根据参考时钟频率产生第一周期计数器状态，并且所述第二节点或每个节点生成第二周期计数器根据内部时钟频率进行状态，其中在顺序同步周期中执行时间同步，其中从第一节点发起的同步消息从一个节点顺序发送到另一个节点，以及由节点发送的同步消息包含用于接收同步消息的至少一个第二节点中的时间同步的信息，使得基于第一周期计数器状态的估计和与线性二次调节器的组合的补偿因子在给定的第二节点中执行时间同步。

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