Upstream echo cancellation in full duplex communications
US10763915B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2018 |
| Grant date | Sep 1, 2020 |
| Priority date | — |
| Expiry date | May 24, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/1461
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An echo cancellation training method in a cable modern is provided, comprising receiving an echo cancellation service ID (EC SID) assigned for echo cancellation training, the cable modem receiving the EC SID from a cable head end in an information element (IE) in a map (MAP or P-MAP) defining a time and frequency of upstream transmission opportunities for the cable modem, the EC SID establishing when the cable modem may perform the echo cancellation training in a downstream channel allocated to the cable modem, transmitting an echo cancellation test signal upstream to the cable head end via an upstream channel allocated to the cable modem and in a time slot specified by the received EC SID in the map, and measuring noise in one or more downstream channels allocated to the cable modem, with the noise resulting from the transmission of the echo cancellation test signal on the upstream channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.