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11.发明申请METHOD AND DEVICES FOR TIME AND FREQUENCY SYNCHRONIZATION USING A PHASE LOCKED LOOP 有权使用相位锁定环路的时间和频率同步的方法和设备公开(公告)号：US20150092797A1
公开(公告)日：2015-04-02
申请号：US14044075
申请日：2013-10-02
Applicant: Khalifa University of Science, Technology, and Research , Emirates Telecommunications Corporation , British Telecommunications plc
Inventor： James Aweya
IPC: H04J3/06
CPC classification number: H03L7/1976 , H03L2207/50 , H04J3/0667 , H04J3/0697
Abstract: This invention relates to methods and devices for time and frequency synchronization, especially over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP). Timing protocol messages are exposed to artifacts in the network such as packet delay variations (PDV) or packet losses. Embodiments of the invention provide a digital phase locked loop (DPLL) based on direct digital synthesis to provide both time and frequency signals for use at the slave (time client). An example of this DPLL in conjunction with a recursive least squares mechanism for clock offset and skew estimation is also provided.
Abstract translation: 本发明涉及用于时间和频率同步的方法和装置，特别是涉及使用例如IEEE 1588精确时间协议（PTP）的分组网络。 定时协议消息暴露在网络中的伪影，例如分组延迟变化（PDV）或分组丢失。 本发明的实施例提供了一种基于直接数字合成的数字锁相环（DPLL），以提供在从机（时间客户机）上使用的时间和频率信号。 还提供了该DPLL与用于时钟偏移和偏移估计的递归最小二乘机制的示例。
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公开(公告)号：US20150092793A1
公开(公告)日：2015-04-02
申请号：US14043068
申请日：2013-10-01
Applicant: Khalifa University of Science, Technology, and Research , Emirates Telecommunications Corporation , British Telecommunications plc
Inventor： James Aweya
IPC: H04L7/00
CPC classification number: H04J3/0667 , H04J3/0685
Abstract: This invention relates to methods and devices for time and frequency synchronization. The invention has particular application where time and frequency synchronization over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP) is being carried out. The primary challenge in clock distribution over packet networks is the variable transit delays experienced by timing packets, packet delay variations (PDVs). Embodiments of the invention provide a method for time offset alignment with PDV compensation where a synchronized frequency signal is available at a slave device via Synchronous Ethernet and is used to determine the compensation parameters for the PDV.
Abstract translation: 本发明涉及用于时间和频率同步的方法和装置。 本发明具有特定的应用，其中使用例如IEEE 1588精确时间协议（PTP）的分组网络进行时间和频率同步。 分组网络中时钟分配的主要挑战是定时分组，分组延迟变化（PDV）所经历的可变传输延迟。 本发明的实施例提供了一种用于与PDV补偿的时间偏移对准的方法，其中同步的频率信号在从属设备经由同步以太网可用并且用于确定PDV的补偿参数。
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公开(公告)号：US10594824B2
公开(公告)日：2020-03-17
申请号：US15933995
申请日：2018-03-23
Applicant: Khalifa University of Science, Technology and Research , Emirates Telecommunications Corporation , British Telecommunications PLC
Inventor： Carla Di Cairano-Gilfedder , Siddhartha Shakya , Beum Seuk Lee , Gilbert Owusu , Kin Poon
Abstract: A method for designating a class of data content for determining how the content will be handled by a content delivery network (CDN) into one of: a transport designation by which content is transported from an entrance node to one or more edge nodes; a caching designation by which the content is stored at one or more edge nodes; and a hybrid designation by which content is stored at a node in the CDN for subsequent transport to one or more edge nodes in the CDN, the method comprising: determining a set of one or more transport designation options; determining a set of one or more caching designation options; determining a set of one or more hybrid designation options; determining a normalised measure resource requirement for each of the transport, caching and hybrid designation options; and selecting one designation option for the class of content from all of the transport, caching and hybrid designation options by an optimisation function for selecting the designation option based on the determined normalised resource requirement for each option.
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14.发明申请公开(公告)号：US20200021379A1
公开(公告)日：2020-01-16
申请号：US16036186
申请日：2018-07-16
Applicant: Khalifa University of Science, Technology, and Research , British Telecommunications plc , Emirates Telecommunications Corporation
Inventor： James Aweya
IPC: H04J3/06
Abstract: This invention relates to peer-to-peer transparent clocks and methods of estimating skew in peer-to-peer transparent clocks. Embodiments of the invention relate to techniques for estimating clock skew between a free-running clock in a transparent clock and a master clock, in particular by using the timing information embedded in timing messages passing through the transparent clock. Further embodiments of the invention set out uses of these estimates to modify the residence times computed by the transparent clock and a synchronization network including such transparent clocks.
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公开(公告)号：US10527307B2
公开(公告)日：2020-01-07
申请号：US15841463
申请日：2017-12-14
Applicant: Khalifa University of Science, Technology, and Research , British Telecommunications plc , Emirates Telecommunications Corporation
Inventor： Fabrice Saffre , Kin Poon , Dymitr Ruta
IPC: F24F11/30 , F24F11/56 , F24F11/61 , G05B15/02 , F24F11/62 , F24F11/88 , F24F11/64 , G06F17/18 , G05B13/02 , F24F11/65 , F24F11/54 , F24F11/46 , F24F11/49 , F24F11/58 , F24F140/40 , F24F110/10 , F24F140/00
Abstract: This invention relates to methods and systems for controlling appliances, particularly climate control appliances such as air conditioning units used in buildings. Embodiments of the invention provide methods and systems which provide a framework of semi-autonomous sensors and actuators which can achieve climate control without the need for centralised or explicit coordination. In certain embodiments, the climate control system is capable of identifying suitable pairings of sensors and actuators and taking into account actions of other actuators. The embodiments have particular application in buildings where large numbers of individual sensors and actuators are deployed in an ad-hoc or unplanned manner over time, but can communicate with each other. The embodiments of the invention can provide improved efficiency, reduced infrastructure costs, improved flexibility and can be deployed across multiple sites.
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Patent Agency Ranking
公开(公告)号：US20180145863A1
公开(公告)日：2018-05-24
申请号：US15358315
申请日：2016-11-22
Applicant: Khalifa University of Science, Technology, and Research , British Telecommunications plc , Emirates Telecommunications Corporation
Inventor： Zdenek Chaloupka , Ivan Boyd
CPC classification number: H04L7/0079 , H04J3/0667 , H04L43/0852 , H04L67/42
Abstract: This invention relates to timing message selection techniques that can be used in conjunction with a clock recovery mechanism to mitigate the effects of packet delay variation on timing messages exchanged over a packet network, particularly when seeking to synchronize the time of a clock in a slave device to that of a master clock. The selection techniques allow the identification of optimal or minimally-delayed timing messages which can subsequently be used in timing synchronisation. Embodiments of the invention provide techniques which identify optimal timing messages in both forward and reverse directions which are then processed to form composite timing messages which are used in a frequency estimation algorithm. Timing messages selected by the methods of the invention are particularly useful in phase synchronization between the master and slave clocks.
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公开(公告)号：US09930109B2
公开(公告)日：2018-03-27
申请号：US14821218
申请日：2015-08-07
Applicant: Khalifa University of Science, Technology, and Research , British Telecommunications plc , Emirates Telecommunications Corporation
Inventor： Fabrice Saffre , Hanno Hildmann , Sebastien Matthieu Rene Nicolas
IPC: G06F15/173 , H04L29/08 , G06F9/50 , G06F1/20 , G06F1/32
CPC classification number: H04L67/1008 , G06F1/206 , G06F1/3206 , G06F9/5094
Abstract: This invention relates to methods and systems for workload distribution, particularly in data centers, more particularly data centers which use fresh air cooling. Embodiments of the invention provide methods and systems which calculate a load value for each server which takes account of both the temperature of the server and its current job queue, and determine the server to which an incoming job should be allocated on the basis of the load values of the available servers.
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公开(公告)号：US20170359210A1
公开(公告)日：2017-12-14
申请号：US15179288
申请日：2016-06-10
Applicant: Khalifa University of Science, Technology and Research , British Telecommunications PLC , Emirates Telecommunications Corporation
Inventor： Zdenek Chaloupka , Ivan Boyd
CPC classification number: H04L27/3854 , H04J3/0667 , H04L69/28
Abstract: This invention relates to methods and systems for estimating skew based on, for example, the IEEE 1588 Precision Time Protocol (PTP). These methods and systems can allow the clock skew between a master clock (server) and slave clock (client) exchanging PTP messages over a packet network to be estimated more rapidly than conventional estimation techniques and thereby improve the convergence of standard estimation algorithms. In one embodiment, the skew estimation is derived from a set of timestamps from a message exchange between the master and slave using a non-linear least square-fitting algorithm. An example of the fitting algorithm is the Levenberg-Marquardt algorithm.
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公开(公告)号：US09665121B2
公开(公告)日：2017-05-30
申请号：US14566951
申请日：2014-12-11
Applicant: Khalifa University of Science, Technology, and Research , British Telecommunications plc , Emirates Telecommunications Corporation
Inventor： James Aweya
Abstract: This invention relates to methods and devices for time synchronization. The invention has particular application in the alignment of slave clocks to a master clock and in dealing with packet delay variation and dynamic asymmetries in the network links between them. In embodiments of the invention, the slave clock uses the peer link delay and residence times measured by peer-to-peer transparent clocks to compensate for clock synchronization errors that arise due to variability in message transfer delays. Embodiments provide a simple linear approximation technique and a Kalman filter-based technique for estimating offset and skew of the slave clock.
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公开(公告)号：US09651271B2
公开(公告)日：2017-05-16
申请号：US14104425
申请日：2013-12-12
Applicant: Khalifa University of Science, Technology, and Research , British Telecommunications plc , Emirates Telecommunications Corporation
Inventor： Fabrice Saffre , Mark Shackleton , Hanno Hildmann , Sébastien Matthieu René Nicolas
IPC: F24F11/00
CPC classification number: F24F11/0009 , F24F11/30 , F24F11/46
Abstract: This invention relates to methods and systems for controlling consumption, particularly power consumption, more particularly by appliances in a building, and is generally suitable for integration with building management systems. Embodiments of the invention provide methods and systems which probabilistically limit the aggregated power load of a plurality of climate control appliances in a building to a selected value, while seeking to minimize the deviation from target environmental conditions within the building. The embodiments of the invention propose distributed decision-making by individual devices based on projected deviation from the target conditions after a period of activity or inactivity.
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