Patent · US Expired

Tone signalling with TFO communication links

US6826404B2 · kind B2 · utility

10Cited by

9References

16Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Eckhard Delfs · Nuremberg, DE
Karl Hellwig · Wonfurt, DE
Rudolf Hoffmann · Monroe, US
Emilian Ertel · Koblenzer Straße, DE

Key dates

Filing date	Feb 9, 2001
Grant date	Nov 30, 2004
Priority date	—
Expiry date	May 30, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH04W88/181
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

The invention provides method and apparatus for transporting tone signalling information through a GCME link in a GSM network supporting TFO and speech compression modes for the passage of signals through the link, respectively using TFO frames and TRAU-like In a data stream to the local entrance to the GCME link, a tone signal to be transported is detected. The detected tone signal is coded into bits of a TFO or TRAU-like frame for sending through the GCME link, including setting bits to mark the frame as a containing tone signalling information and setting bits to identify the detected tone signal, whereby the tone signalling information is transported in-band through the GCME link as a marked TFO or TRAU-like frame. At the remote exit from the GCME link, the marked frame is detected and the tone signal regenerated in dependence upon the bits of the marked frame.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.