Performance Trade-Offs in an integrated voice/data services TDM system

A fairly tight upper bound for the mean queue size of a voice/data integrated TDM is derived. The result is applied to a queueing analysis of the data traffic subject to a prescribed voice call blocking probability. The analysis also indicates that the integration of voice and data services using time assignment speech interpolation (TASI) significantly improves the system performance over one without TASI. The problem of how to select the speech activity detection threshold at the voice source is addressed. We show that the voice correlation effect is heavily dependent upon the speech activity detection threshold at the voice source. A low threshold gives a low voice queueing delay and, therefore, a smaller time distortion on the received voice process.