Patent ID: 6347081
Filing Date: 2002-02-12
Classification: H04W,Y02D

Abstract:
In a TDMA radio communication system having a transmitting and a receiving end, operating at a frame transmission rate R, and having a speech traffic channel on which the source signal is transmitted in at least two modes, of which one mode is applied during periods of inactive speech, a transmission method for source encoded speech inactivity frames operating at a speech inactivity frame rate r being smaller than rate R, comprising:using a transmission frame rate higher than r or equal to r for the transmission of channel error protected speech inactivity frames; reducing the transmission power by an amount such that the transmission power is still sufficiently high for the receiving end to decode the inactivity frames within some predetermined quality criterion, and at the transmitting end of the link: transmitting at least a first frame which is encoded as a speech inactivity frame, immediately following at least one frame which has not been encoded as speech inactivity frame, at a transmission power level which is not reduced by the same amount as the power level being used for other speech inactivity frames.