Playout scheduling and loss-concealments in voip for optimizing conversational voice communication quality

ABSTRACT

In this paper, we present new adaptive playout scheduling (POS) and loss concealment (LC) schemes for delivering high and consistent conversational voice communication quality (CVCQ) perceived by users in real-time VoIP systems. We first characterize the delay and loss conditions of an IP network and a human conversation in a VoIP system. We then identify the attributes that affect the human perception of CVCQ, which include listening-only speech quality (LOSQ), conversational interactivity (CI), and conversational efficiency (CE). We investigate their trade-offs with respect to system-controllable mouth-to-ear delays (MEDs) and the amount of redundant piggybacking. Finally, we evaluate our adaptive POS and redundancy-based LC schemes by packet traces collected in the PlanetLab.

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INDEX TERMS

Primary Classification:
  H. Information Systems
  H.4 INFORMATION SYSTEMS APPLICATIONS
      H.4.3 Communications Applications
          Subjects: Computer conferencing, teleconferencing, and videoconferencing

General Terms:
Algorithms, Design, Human Factors, Performance

Keywords:
just noticeable difference, multimedia communication, perceptual conversational quality, voice over IP