公开(公告)号：US20200186192A1

公开(公告)日：2020-06-11

申请号：US16792740

申请日：2020-02-17

Applicant: Cisco Technology, Inc.

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

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

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.

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：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：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：US09692563B2

公开(公告)日：2017-06-27

申请号：US14680873

申请日：2015-04-07

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Tong Liu ,  Hang Jin

IPC: H04L5/00 ,  H04L27/34 ,  H04B3/54 ,  H04L27/26 ,  H04L12/801 ,  H04L12/807 ,  H04J3/06 ,  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 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.

公开(公告)号：US09660774B2

公开(公告)日：2017-05-23

申请号：US14685422

申请日：2015-04-13

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Hang Jin ,  Tong Liu ,  Pawel Piotr Sowinski

IPC: G06F11/00 ,  H01J1/16 ,  H04L1/00 ,  H04L12/26 ,  H04L5/00 ,  H04L27/34 ,  H04B3/54 ,  H04L27/26 ,  H04L12/801 ,  H04L12/807 ,  H04J3/06 ,  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 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.