公开(公告)号：US10574356B2

公开(公告)日：2020-02-25

申请号：US15880687

申请日：2018-01-26

Applicant: Cisco Technology, Inc.

Inventor： John T. Chapman ,  Hang Jin ,  Alon Shlomo Bernstein

IPC: H04B10/2575 ,  H04W88/08 ,  H04W92/02

Abstract: A virtual physical layer may be provided. When providing the virtual physical layer, a remote radio head may be used. The remote radio head may comprise a first interface device, a second interface device, a digital-to-analog converter, and an analog-to-digital converter. The first interface device may be connected to a virtual physical layer instance instantiated in a cloud-based environment. The second interface device may be connected to customer premises equipment. The digital-to-analog converter may be connected between the first interface device and the second interface device and the analog-to-digital converter may also be connected between the first interface device and the second interface device.

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.

公开(公告)号：US20190326950A1

公开(公告)日：2019-10-24

申请号：US15957079

申请日：2018-04-19

Applicant: Cisco Technology, Inc.

Inventor： Hang Jin ,  John T. Chapman

IPC: 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 cancelation pathway during a downstream silence period and an upstream silence period. The echo cancelation pathway may comprise an electronic element. Next, a loopback response signal may be received in response to sending the test signal through the echo cancelation 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：US20190274064A1

公开(公告)日：2019-09-05

申请号：US16293427

申请日：2019-03-05

Applicant: Cisco Technology, Inc.

Inventor： John T. Chapman ,  Jennifer Andreoli-Fang

IPC: H04W28/02 ,  H04W72/12 ,  H04W72/14 ,  H04W28/24

Abstract: A quality of service framework for applications may be provided. First, a Bandwidth Report (BWR) message may be received from a first sub-system by a second sub-system. The BWR message may correspond to traffic to be received from the first sub-system by the second sub-system. Next, based on the BWR message, the second sub-system may schedule grants for the traffic to be received from the first sub-system. The second sub-system may then receive, from the first sub-system, the traffic. Then the second sub-system may transmit the traffic based on the scheduled grants.

公开(公告)号：US20180270103A1

公开(公告)日：2018-09-20

申请号：US15983062

申请日：2018-05-17

Applicant: Cisco Technology, Inc.

Inventor： John T. Chapman ,  Jennifer Andreoli-Fang

IPC: H04L12/24 ,  H04W24/10

Abstract: One embodiment is a method and includes receiving at a termination element of a first network a bandwidth report (“BWR”), in which the BWR includes information regarding a data transmission opportunity over a second network for at least one endpoint data; scheduling a first network transmission opportunity for the at least one endpoint data using information derived from the received BWR; and receiving from a 5 first network forwarding device the at least one endpoint data in accordance with the scheduled first network transmission opportunity.

公开(公告)号：US20180219958A1

公开(公告)日：2018-08-02

申请号：US15666644

申请日：2017-08-02

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Alon Shlomo Bernstein ,  Ian McDowell Campbell ,  John T. Chapman

IPC: H04L29/08 ,  H04L12/24

CPC classification number: H04L67/16 ,  H04L41/0813 ,  H04L41/0893

Abstract: One embodiment is a method including extending a policy server to provide per subscriber policies to a cable modem (CM) and a cable modem termination system (CMTS), receiving, at the policy server, a request for a policy profile from a cable modem termination system (CMTS), accessing a subscriber database to determine the policy profile, and communicating the policy profile to the CMTS. In an example, the policy server is a packet cable multimedia policy server of a cable network.

公开(公告)号：US10033542B2

公开(公告)日：2018-07-24

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 ,  H04L12/931

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.

公开(公告)号：US09942024B2

公开(公告)日：2018-04-10

申请号：US15052428

申请日：2016-02-24

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Hang Jin ,  John T. Chapman

IPC: H04L5/14 ,  H04B3/20 ,  H04L12/28

CPC classification number: H04L5/1461 ,  H04B3/20 ,  H04L12/2801

Abstract: An example communication system comprises a media access control (MAC) scheduler in a cable network, and a full band transceiver. The MAC scheduler implements a two-dimensional transmission-reception (T-R) coordination scheme among a plurality of cable modems in the cable network. According to the T-R coordination scheme, the cable modems are categorized into interference groups, 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, facilitating full duplex communication in the cable network across the frequency range. The full band transceiver implements an adaptive interference cancellation scheme, which suppresses at a receiver of the respective component, a signal transmitted by a transmitter of the respective component. The communication system further includes a full band amplifier, implementing the adaptive interference cancellation scheme and a ringing suppression scheme with echo cancellation.

公开(公告)号：US20170265216A1

公开(公告)日：2017-09-14

申请号：US15456115

申请日：2017-03-10

Applicant: Jennifer Andreoli-Fang ,  CISCO TECHNOLOGY, INC.

Inventor： Jennifer Andreoli-Fang ,  John T. Chapman

IPC: H04W72/12 ,  H04W28/02 ,  H04W84/04 ,  H04L12/28

CPC classification number: H04W72/1252 ,  H04L12/2801 ,  H04L12/4625 ,  H04W28/0278 ,  H04W84/045

Abstract: One embodiment is a method and includes receiving at a termination element of a first network a bandwidth report (“BWR”), in which the BWR includes information regarding a data transmission opportunity over a second network for at least one endpoint data; scheduling a first network transmission opportunity for the at least one endpoint data using information derived from the received BWR; and receiving from a first network forwarding device the at least one endpoint data in accordance with the scheduled first network transmission opportunity.

公开(公告)号：US09735814B1

公开(公告)日：2017-08-15

申请号：US15352438

申请日：2016-11-15

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Hang Jin ,  John T. Chapman

IPC: H04L25/49 ,  H04B1/04

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F1/3258 ,  H03F1/56 ,  H03F3/189 ,  H03F3/245 ,  H03F2200/222 ,  H03F2200/387 ,  H04B2001/0425

Abstract: An example method for facilitating a high power efficient amplifier through digital pre-distortion (DPD) in cable network environments is provided and includes receiving a first signal and a second signal at a DPD coefficient finder in an amplifier module of a cable modem, the second signal including transformations of the first signal from distortions due to channel effects and amplifier nonlinearity, synchronizing the first signal and the second signal, removing the channel effects, computing a first vector representing an inverse of the nonlinearity of the amplifier, computing a second vector representing an inverse of certain channel effects and providing DPD coefficients to a DPD actuator, the DPD coefficients including the first vector and the second vector, the DPD actuator predistorting an input signal to the amplifier module with the DPD coefficients, such that an output signal from the amplifier module retains linearity relative to the input signal.