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    Echo cancellation to alleviate timing varying channels
    4.
    发明授权
    Echo cancellation to alleviate timing varying channels 有权

    公开(公告)号：US10567036B2

    公开(公告)日：2020-02-18

    申请号：US16012504

    申请日：2018-06-19

    Applicant: Cisco Technology, Inc.

    Inventor： John T. Chapman ,  Hang Jin ,  Tong Liu

    IPC: H04B3/23 ,  H04B3/32 ,  H04B10/25

    Abstract: Echo cancellation to alleviate timing varying channels may be provided. First, a feedback signal corresponding to one of a plurality of downstream paths and a combination upstream signal comprising a combination of upstream signals from a plurality of upstream paths may be received. Next, a plurality of echo corrected signals may be created using the feedback signal, the combination upstream signal, and a plurality of echo cancelation coefficients that each respectively correspond to each one of the plurality of echo corrected signals and that are different from each other. Then a one of the plurality of echo cancelation coefficients that corresponds to a one of the plurality of echo corrected signals that provides a best echo cancelation performance as compared to other ones of the plurality of echo corrected signals may be selected to use.

    UPSTREAM CONTENTION MEASURMENT REPORTING AND MITIGATION IN DOCSIS REMOTE PHY NETWORK ENVIRONMENTS
    5.
    发明申请
    UPSTREAM CONTENTION MEASURMENT REPORTING AND MITIGATION IN DOCSIS REMOTE PHY NETWORK ENVIRONMENTS 有权
    上海远程物理网络环境中的上报内部测量报告和缓解

    公开(公告)号：US20150295838A1

    公开(公告)日：2015-10-15

    申请号：US14680873

    申请日：2015-04-07

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： Tong Liu ,  Hang Jin

    IPC: H04L12/807 ,  H04L12/801

    CPC classification number: H04L5/0007 ,  H04B3/542 ,  H04J3/0667 ,  H04J3/0673 ,  H04L5/006 ,  H04L12/2801 ,  H04L27/2697 ,  H04L27/3405 ,  H04L27/345 ,  H04L47/12 ,  H04L47/27

    Abstract: An example method for upstream contention measurement and reporting in Data Over Cable Service Interface Specification (DOCSIS) remote physical layer (R-PHY) network environments is provided and includes receiving, at a Converged Cable Access Platform (CCAP) core from a R-PHY node over a converged interconnect network (CIN) in the DOCSIS R-PHY network environment, an indication of a collision level in an upstream network between the R-PHY node and a plurality of cable modems (CMs), calculating a congestion level in the upstream network based on the collision level indicated by the R-PHY node, adjusting back-off window parameters for cable modem retransmissions based on the calculated congestion level, and adjusting a contention transmission opportunity density in a downstream Media Access Protocol (MAP) message based on the adjusted back-off window parameters.

    Abstract translation: 提供了一种用于数据有线服务接口规范（DOCSIS）远程物理层（R-PHY）网络环境中的上游竞争测量和报告的示例方法，包括在R-PHY的融合电缆接入平台（CCAP）核心处接收 在DOCSIS R-PHY网络环境中的融合互连网络（CIN）上的节点，指示R-PHY节点和多个电缆调制解调器（CM）之间的上游网络中的冲突级别，计算在 基于由R-PHY节点指示的冲突级别的上行网络，基于所计算的拥塞级别调整用于电缆调制解调器重传的后退窗口参数，以及基于下游媒体接入协议（MAP）消息中的争用传输机会密度来调整 在调整后的退出窗口参数上。

    Interference group discovery for full duplex network architecture in cable network environment
    6.
    发明授权
    Interference group discovery for full duplex network architecture in cable network environment 有权

    公开(公告)号：US10135490B2

    公开(公告)日：2018-11-20

    申请号：US15483234

    申请日：2017-04-10

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： John T. Chapman ,  Hang Jin ,  Tong Liu

    IPC: H04B3/46 ,  H04B17/345 ,  H04L12/28 ,  H04L5/14

    Abstract: An example apparatus comprises a processor, and a memory element in communication with the processor. The processor configured to send a first message to at least a first cable modem of a plurality of cable modems. The first message indicates an upstream test signal to be generated by the first cable modem within a predetermined portion of a frequency spectrum allocated for downstream communication. The processor is further configured to send a second message to at least a second cable modem of the plurality of cable modems. The second message indicates a downstream interference measurement to be performed on the upstream test signal by the second cable modem. The processor is further configured to receive at least one interference measurement result indicative of the downstream interference measurement, and determine at least one interference group for the plurality of cable modems based upon the at least one interference measurement result.

    Interference detection and avoidance in a telecommunication network
    7.
    发明授权
    Interference detection and avoidance in a telecommunication network 有权
    电信网络中的干扰检测和避免

    公开(公告)号：US09503180B2

    公开(公告)日：2016-11-22

    申请号：US14476969

    申请日：2014-09-04

    Applicant: Cisco Technology, Inc.

    Inventor： Hang Jin ,  Tong Liu ,  Pawel Sowinski ,  De Fu Li ,  John Skrobko

    IPC: H04J14/08 ,  H04B10/079 ,  H04J3/16 ,  H04L12/26 ,  H04L12/28

    CPC classification number: H04B10/0795 ,  H04B10/0793 ,  H04J3/1694 ,  H04J14/086 ,  H04L12/2801 ,  H04L43/0882

    Abstract: Presented herein are techniques for detection and avoidance of interference in a telecommunications network. In one example, a cable modem termination system (CMTS) is configured to receive upstream traffic from a plurality of cable modems. The CMTS detects collision characteristics resulting from substantially simultaneous transmissions from different combinations of the cable modems. Based on the detected collision characteristics, the CMTS designates/identifies collision groups for each of a plurality of the cable modems. After designation of the collision groups, the CMTS schedules upstream transmissions by the plurality of cable modems such that cable modems within the same collision group do not transmit within a same time frame and such that two or more cable modems that are not within the same collision group may transmit within a same time frame.

    Abstract translation: 这里提出的是用于检测和避免电信网络中的干扰的技术。 在一个示例中，电缆调制解调器终端系统（CMTS）被配置为从多个电缆调制解调器接收上行流量。 CMTS检测来自电缆调制解调器的不同组合的基本同时传输产生的冲突特性。 基于检测到的碰撞特性，CMTS指定/识别多个电缆调制解调器中的每一个的冲突组。 在指定冲突组之后，CMTS调度多个电缆调制解调器的上行传输，使得同一冲突组内的电缆调制解调器在相同的时间帧内不发送，并且使得两个或更多个不在同一冲突内的电缆调制解调器 组可以在相同的时间帧内传输。

    DETERMINING AND MANAGING UPSTREAM PROFILES IN DOCSIS 3.1 NETWORK ENVIRONMENTS
    8.
    发明申请
    DETERMINING AND MANAGING UPSTREAM PROFILES IN DOCSIS 3.1 NETWORK ENVIRONMENTS 有权
    在DOCSIS 3.1网络环境中确定和管理上游配置文件

    公开(公告)号：US20150295684A1

    公开(公告)日：2015-10-15

    申请号：US14685422

    申请日：2015-04-13

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： Hang Jin ,  Tong Liu ,  Pawel Piotr Sowinski

    IPC: H04L5/00 ,  H04L27/34

    CPC classification number: H04L5/0007 ,  H04B3/542 ,  H04J3/0667 ,  H04J3/0673 ,  H04L5/006 ,  H04L12/2801 ,  H04L27/2697 ,  H04L27/3405 ,  H04L27/345 ,  H04L47/12 ,  H04L47/27

    Abstract: An example method for determining and managing upstream profiles in Data Over Cable Service Interface Specification (DOCSIS) 3.1 network environments is provided and includes determining, at a Converged Cable Access Platform (CCAP) core, channel conditions independent of any channel effect over a hybrid fiber coaxial (HFC) network between a remote physical layer (R-PHY) entity coupled to the CCAP core and a cable modem (CM) in the DOCSIS 3.1 network environment, and assigning an upstream profile to the CM based on the channel conditions. In specific embodiments, the channel conditions include signal to noise ratio (SNR), modulation error ratio (MER) or group delay. In some embodiments, assigning the upstream profile includes determining a quadrature amplitude modulation (QAM) order based on the SNR or MER, and determining a pilot pattern based on the group delay, the combination of the QAM order and the pilot pattern identifying the upstream profile.

    Abstract translation: 提供了一种用于确定和管理数据有线服务接口规范（DOCSIS）3.1网络环境中的上行配置文件的示例方法，包括在融合电缆接入平台（CCAP）核心处确定与混合光纤无关的任何信道效应的信道条件 在耦合到CCAP核心的远程物理层（R-PHY）实体和DOCSIS 3.1网络环境中的电缆调制解调器（CM）之间的同轴（HFC）网络，以及基于信道条件向CM分配上行简档。 在具体实施例中，信道条件包括信噪比（SNR），调制误差比（MER）或组延迟。 在一些实施例中，分配上行简档包括基于SNR或MER确定正交幅度调制（QAM）顺序，以及基于组延迟确定导频模式，QAM顺序和识别上游简档的导频模式的组合 。

    MANAGING TIME OFFSET AND FREQUENCY DRIFT IN ASYNCHRONOUS DOCSIS REMOTE PHY NETWORK ENVIRONMENTS
    9.
    发明申请
    MANAGING TIME OFFSET AND FREQUENCY DRIFT IN ASYNCHRONOUS DOCSIS REMOTE PHY NETWORK ENVIRONMENTS 有权
    在异步DOCSIS远程物理网络环境中管理时间偏移和频率干扰

    公开(公告)号：US20150295669A1

    公开(公告)日：2015-10-15

    申请号：US14685403

    申请日：2015-04-13

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： John T. Chapman ,  Yi Tang ,  Lin Su ,  Tong Liu ,  Hang Jin

    IPC: H04J3/06

    CPC classification number: H04L5/0007 ,  H04B3/542 ,  H04J3/0667 ,  H04J3/0673 ,  H04L5/006 ,  H04L12/2801 ,  H04L27/2697 ,  H04L27/3405 ,  H04L27/345 ,  H04L47/12 ,  H04L47/27

    Abstract: An example method for managing time offset and frequency drift in asynchronous Data Over Cable Service Interface Specification (DOCSIS) Remote Physical layer (R-PHY) network environments is provided and includes receiving, at a first hardware device, time synchronization message from a remote second hardware device in the DOCSIS R-PHY network, determining a time difference between a first clock at the first hardware device and a second clock at the second hardware device from the time synchronization message; and re-stamping an event message based on the time difference.

    Abstract translation: 提供了用于在异步数据有线服务接口规范（DOCSIS）远程物理层（R-PHY）网络环境中管理时间偏移和频率漂移的示例性方法，包括在第一硬件设备处接收来自远程秒的时间同步消息 DOCSIS R-PHY网络中的硬件设备，从时间同步消息确定第一硬件设备的第一时钟与第二硬件设备的第二时钟之间的时间差; 并根据时差重新标记事件消息。

    PROACTIVE ECHO CANCELLATION (EC) TRAINING
    10.
    发明申请
    PROACTIVE ECHO CANCELLATION (EC) TRAINING 审中-公开

    公开(公告)号：US20200304170A1

    公开(公告)日：2020-09-24

    申请号：US16362293

    申请日：2019-03-22

    Applicant: Cisco Technology, Inc.

    Inventor： Hang Jin ,  Tong Liu

    IPC: H04B3/23 ,  H04L12/64 ,  H04L12/28

    Abstract: Proactive Echo Cancellation (EC) training may be provided. First, a plurality of Echo Cancellation Training Opportunities (ECTOs) may be identified in an upstream bandwidth allocation. Identifying the ECTOs may comprise identifying a corresponding plurality of mini-slots in a two dimensional time frequency space designated as not to be used for Upstream (US) traffic. Then Echo Cancellation Training (ECT) may be conducted for each of the plurality of ECTOs.

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