Patent ID: 6128513
Filing Date: 2000-10-03
Classification: H04W

Abstract:
A method for voice transmission via a radio interface in a digital radio communication system having at least one mobile station and at least one base station, said method comprising the steps of:transmitting at least one signal between a mobile station and a base station via a radio interface;identifying at least one characteristic value of said signal indicative of a quality of transmission conditions of the radio interface;comparing said characteristic value to a threshold and thereby obtaining a comparison result identifying current transmission conditions of said radio interface as being good or poor;providing a plurality of voice encoders including at least a first voice encoder having a first data rate and a second voice encoder having a second data rate, said first data rate being higher than said second data rate;employing a first ratio of protective bits to useful bits in said first voice encoder and employing a second ratio of protective bits to useful bits in said second voice encoder, said first ratio being lower than said second ratio; andselecting said first voice encoder for encoding said signal if said comparison results indicates good transmission conditions and selecting said second voice encoder for encoding said signal if said comparison result indicates poor transmission conditions.