A METHOD, COMMUNICATION SYSTEM, MOBILE STATION AND NETWORK ELEMENT FOR TRANSMITTING BACKGROUND NOISE INFORMATION IN DATA TRANSMISSION IN DATA FRAMES

摘要

The invention relates to a method for transmitting background noise information in a communication system in which the information to be transmitted is formed into data frames, said data frames are subjected to channel coding to form channel-coded frames, said channel-coded frames are interleaved to be transmitted in two or more data transmission frames (501-516), and information of two channel-coded frames is transmitted in each data transmission frame (501-516). Background noise information to be transmitted at a time if formed into at least a first silence descriptor frame (SID) which is provided with a silence descriptor identifier (SID-CW). Said first silence descriptor frame (SID) is subjected to channel coding to form a channel-coded silence descriptor frame. Said channel-coded silence descriptor frame is transmitted in two or more data transmission frames (502, 503; 506, 507; 510, 511; 514, 515), and at least one data transmission frame (502, 503; 506, 507; 510, 511; 514, 515) transmitting said channel-coded silence descriptor frame is also used as an extra signalling channel (SIG-CH).