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Method and device for cancelling echoes

A technology of echo and equipment, applied in the field of communication, can solve the problem of inability to configure, add, add, etc.

Active Publication Date: 2012-02-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is no longer possible to configure and add EC on specific relays like traditional networks
There is no solution provided in the prior art to solve the problem of adding EC when the call is connected to the IMS

Method used

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  • Method and device for cancelling echoes
  • Method and device for cancelling echoes
  • Method and device for cancelling echoes

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] There are mainly two methods for connecting CS domain users (including mobile users and fixed users) to the IMS.

[0031] A method for connecting a call to the IMS is an intelligent number change anchoring method. The smart protocol defines the interaction between a Service Switching Point (Service Switching Point, SSP) and a Service Control Point (Service Control Point, SCP), and is widely used in prepaid users. The principle of smart calling is that ...

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Abstract

The embodiment of the invention provides a method and device for cancelling echoes and relates to the technical field of communication. The method for cancelling echoes comprises the following steps of: receiving information carrying access classification of an opposite terminal user from an opposite terminal network element by a local terminal network element; judging whether an echo canceller (EC) needs to be added during establishing load bearing by the local terminal network element according to the access classification of the opposite terminal user and the access classification of a local terminal user; and judging that the echo canceller (EC) needs to be added, adding the echo canceller (EC) during establishing load bearing at a local terminal or opposite terminal. With the help ofthe method and device for cancelling echoes provided by the embodiment of the invention, the problem of adding the EC of IMS (Information Management System) while calling is solved.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and equipment for eliminating echo. Background technique [0002] Echo has electrical echo and acoustic echo. Acoustic echo is caused by the sound emission of the other party's mobile phone, and it is mainly resolved by the mobile phone itself. The electrical echo is caused by the hybrid coil used for 2 / 4 wire conversion in the Public Switch Telephone Network (PSTN), and it is mainly solved by the echo canceller (EC) in the network equipment. [0003] For calls between mobile users and fixed users, due to the air interface, the delay is increased, which makes the echo obvious, and EC needs to be added. A traditional call network between a mobile user and a fixed user consists of a mobile end office, a mobile gateway office, a fixed network gateway office and a fixed network end office. The call needs to pass through the mobile gateway office and the fixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08H04L29/06
CPCH04M9/082
Inventor 李云飞孙联峰
Owner HUAWEI TECH CO LTD
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