Design and analysis of optimal adaptive de-jitter buffers

In order to transfer voice or some other application requiring real-time delivery over a packet network, we need a de-jitter buffer to eliminate delay jitters. An important design parameter is the depth of the de-jitter buffer since it influences two important parameters controlling voice quality, namely voice-path delay and packet loss probability. In this paper, we propose and study several schemes for optimally adjusting the depth of the de-jitter buffer. In addition to de-jitter-buffer depth adjustments within a call, the initial value and rates of changes of the de-jitter buffer depth are allowed to depend on the class of the call and are adaptively adjusted (upwards or downwards) for every new call based on voice-path delay and packet loss probability measurements over one or more previous calls. Parameter adjustments are geared towards either (a) minimizing voice-path delay while maintaining a packet loss probability objective, or (b) maximizing R-factor, an objective measure o...

• Type: Journal
• Year: 2004
• Where: COMCOM
• Authors: Gagan L. Choudhury, Robert G. Cole
• Keywords: COMCOM 2004, De-jitter Buffer, Packet Loss Probability, Voice-path Delay