公开(公告)号：US10523270B1

公开(公告)日：2019-12-31

申请号：US16008737

申请日：2018-06-14

Applicant: Cisco Technology, Inc.

Inventor： John T. Chapman ,  Hang Jin ,  John Holobinko ,  Yubin Chen ,  John Alexander Ritchie, Jr. ,  Martin Mattingly

IPC: H04L5/14 ,  H04B3/23 ,  H04L12/28

Abstract: Full Duplex (FDX) enhanced node deployment may be provided. First, a first device level may be provided comprising a first plurality of FDX enhanced nodes. The first plurality of FDX enhanced nodes may comprise a first FDX enhanced node and a second FDX enhanced node. The first plurality of FDX enhanced nodes may be operated in a first mode. Next, a second device level may be provided comprising a third FDX enhanced node. The second device level may be upstream from the first device level. The third FDX enhanced node may be operated in a second mode. Then an input port of the first FDX enhanced node and an input port of the second FDX enhanced node may be provided with a same type of input that is being provided to an input port of the third FDX enhanced node. The first plurality of FDX enhanced nodes may then be switched from being operated in the first mode to being operated in the second mode.

公开(公告)号：US10516435B1

公开(公告)日：2019-12-24

申请号：US16183548

申请日：2018-11-07

Applicant: Cisco Technology, Inc.

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

IPC: H04M11/00 ,  H04B1/56 ,  H04L12/26

Abstract: Detection of a device connected to a network element may be provided. First, upstream allocation data corresponding to the device may be received. Next, active minislot data detected at the network element may be received. It may then be determined that the upstream allocation data and the active minislot data correlate. In response to determining that the upstream allocation data and the active minislot data correlate, it may be determined that the device is attached to the network element.

公开(公告)号：US10469128B1

公开(公告)日：2019-11-05

申请号：US15957079

申请日：2018-04-19

Applicant: Cisco Technology, Inc.

Inventor： Hang Jin ,  John T. Chapman

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04B3/23

Abstract: Analog echo cancellation with Digital-to-Analog Converter (DAC) noise suppression may be provided. First, a test signal may be sent through an echo cancellation pathway during a downstream silence period and an upstream silence period. The echo cancellation pathway may comprise an electronic element. Next, a loopback response signal may be received in response to sending the test signal through the echo cancellation pathway. Then a channel response model may be created that characterizes a channel response of the loopback response signal and a non-linear model may be created that characterizes a non-linearity of the electronic element. Next, for a downstream signal, a non-linear component may be generated based on the created non-linear model. The generated non-linear component may be convolved with the created channel response model. The convolved non-linear component may then be subtracted from an upstream signal.

公开(公告)号：US20190326861A1

公开(公告)日：2019-10-24

申请号：US15957061

申请日：2018-04-19

Applicant: Cisco Technology, Inc.

Inventor： Hang Jin ,  John T. Chapman

IPC: H03F1/32 ,  H03F3/19 ,  H03F3/21 ,  H03F1/56

Abstract: Digital pre-distortion may be provided. First, a radio frequency (RF) domain distortion correcting signal and a base band (BB) domain distortion correcting signal may be initialized. Then the RF domain distortion correcting signal may be generated from an input signal. The generated RF domain distortion correcting signal may correspond to an amplifier. Next, the BB domain distortion correcting signal may be generated from the input signal. The generated BB domain distortion correcting signal may correspond to the amplifier. Then the RF domain distortion correcting signal and the BB domain distortion correcting signal may be combined to form a hybrid distortion correcting signal. The hybrid distortion correcting signal may then be provided to input matching circuitry feeding the amplifier.

公开(公告)号：US20190326860A1

公开(公告)日：2019-10-24

申请号：US15956858

申请日：2018-04-19

Applicant: Cisco Technology, Inc.

Inventor： Hang Jin ,  John T. Chapman

IPC: H03F1/32 ,  H03F3/24

Abstract: Digital pre-distortion may be provided. First, a characterization for input matching circuitry may be determined. Next, a characterization for non-linearity of an amplifier connected to the input matching circuitry may be determined. Then, a distortion correcting signal may be generated from an input signal based on the determined characterization for the input matching circuitry and the determined characterization for the non-linearity of the amplifier. The generated distortion correcting signal may then be provided to the input matching circuitry.

公开(公告)号：US10230519B2

公开(公告)日：2019-03-12

申请号：US15483260

申请日：2017-04-10

Applicant: CISCO TECHNOLOGY, INC.

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

IPC: H04L5/14 ,  H04L5/00 ,  H04L12/917 ,  H04L12/911 ,  H04B3/52

Abstract: An example apparatus comprises a processor, a memory element, and a media access control (MAC) scheduler. The MAC scheduler is configured to implement a transmission-reception (T-R) coordination scheme among a plurality of cable modems in a cable network, wherein the cable modems are categorized into interference groups. The MAC scheduler is further configured to assign one or more of the interference groups to at least one transmission group based upon predetermined criteria; and determine an upstream bandwidth constraint and downstream bandwidth constraint for the at least one transmission group, wherein the upstream bandwidth constraint and downstream bandwidth constraint is implemented by proportionally modifying an allocated upstream bandwidth and an allocated downstream bandwidth for the at least one transmission group to require that the sum of the allocated upstream bandwidth and the allocated downstream bandwidth does not exceed a spectrum capacity for the at least one transmission group.

公开(公告)号：US10044607B2

公开(公告)日：2018-08-07

申请号：US15096746

申请日：2016-04-12

Applicant: CISCO TECHNOLOGY, INC.

Inventor： John T. Chapman ,  Carlos M. Pignataro ,  Alon Bernstein ,  Stefano B. Previdi

IPC: H04L12/723 ,  H04L12/721 ,  H04L29/06

Abstract: A system and method for facilitating communication with segment routing in a cable modem network environment may be provided. A pseudowire (PW) control packet including segment routing information including a PW segment identifier (SID) for establishing a data session between the RPD and a network element over a packet switched network is received at a remote physical device (RPD). The PW SID may be indicative of a segment in the packet switched network to be used for communicating PW data packets of the data session. The PW control packet and the PW data packets being are emulations of a point-to-point connection between the RPD and the network element. A mapping between the PW SID and the data session is written into a segment table of the RPD.

公开(公告)号：US20180205532A1

公开(公告)日：2018-07-19

申请号：US15648309

申请日：2017-07-12

Applicant: CISCO TECHNOLOGY, INC.

Inventor： John T. Chapman ,  Hang Jin

IPC: H04L5/14 ,  H04L12/28 ,  H04L25/08

CPC classification number: H04L5/143 ,  H04B3/21 ,  H04B3/23 ,  H04L5/1461 ,  H04L12/2801 ,  H04L25/08 ,  H04L27/122 ,  H04L27/148

Abstract: Designs for a front end for suppressing adjacent channel interference (ACI) and adjacent leakage interference (ALI) in a full duplex cable modem (CM) for a Data Over Cable Service Interface Specification (“DOCSIS”) network are described. The CM includes an upstream (US) signal path receiving a digital US input signal and transmitting an analog-converted US signal in a US frequency range to a cable modem termination system (CMTS); a downstream (DS) signal path receiving an analog DS signal in a DS frequency range and converting the analog DS signal into a digital DS signal; and an echo cancellation (EC) circuit configured to subtract, from at least one of the analog DS signal and the digital DS signal, a correction signal generated from the digital US input signal or a correction signal generated from the analog-converted US signal to generate an echo-cancelled digital DS input signal without ACI and ALI.

公开(公告)号：US09722739B2

公开(公告)日：2017-08-01

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 ,  H04L5/00 ,  H04L27/34 ,  H04B3/54 ,  H04L27/26 ,  H04L12/801 ,  H04L12/807 ,  H04L12/28

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.

公开(公告)号：US20170019239A1

公开(公告)日：2017-01-19

申请号：US15052466

申请日：2016-02-24

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Hang Jin ,  John T. Chapman

IPC: H04L5/14 ,  H04L12/28 ,  H04L1/00

CPC classification number: H04L12/2801 ,  H04L1/004 ,  H04L5/1438 ,  H04L49/70

Abstract: An example method for scheduling in full duplex cable network environments is provided and includes categorizing a plurality of cable modems in a cable network into interference groups, scheduling upstream transmissions and downstream receptions for cable modems in each interference group, such that no cable modem of any one interference group transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, generating scheduling information of the scheduling, and transmitting the scheduling information to the cable modems.

Abstract translation: 提供了一种用于在全双工有线网络环境中进行调度的示例方法，包括将有线网络中的多个电缆调制解调器分类为干扰组，对每个干扰组中的电缆调制解调器进行上行传输和下游接收，使得任何 一个干扰组同时在同一干扰组中的另一个电缆调制解调器在频率范围内接收下游，同时发送上行，产生调度的调度信息，并将调度信息发送到有线调制解调器。