TWO INTERCONNECT CALLS OVER A SINGLE RF CHANNEL
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-16
In order to preserve battery life in iDEN sub- scriber units, a feature call Discontinuous Transmit (DTx) is used. DTx works by not transmitting speech frames during periods where the voice ener- gy is relatively small. When these frames are not received, the infrastructure will supply "comfort noise" samples in the inbound (PSTN) direction that bridges the periods where the packets are not trans- mitted. The subscriber will only transmit for the purpose of periodically updating certain comfort noise parameters during this DTx period.