Assessing voice quality in packet-based telephony

Janssen, J.H.; Vleeschauwer, Danny De; Buchli, M.; Petit, Guido H.

doi:10.1109/mic.2002.1003131

Cited by 52 publications

(28 citation statements)

References 2 publications

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“…An equilibrium was obtained and characterized for an alternative buffer management that was proposed, called VLRED. We note that in contrast to [3], since we also include in the utility of CBR traffic a penalty for losses (which is supported by studies of voice quality in packet-based telephony [4]), we do obtain an equilibrium when using RED. For other related papers, see for instance [5] (in which a priority game is considered for competing connections sharing a drop-tail buffer), [6] as well as the survey [7].…”

Section: Introductionmentioning

confidence: 80%

“…• S i is a sublattice, 4 • U i is upper semi-continuous in t i and [t] Ài , • U i has nondecreasing differences in (t i , [t] Ài ), i.e., for all t i P t 0 i and ½t Ài P ½t 0 Ài ,…”

Section: Supermodular Gamesmentioning

confidence: 99%

“…For example if the utility of user i has nondecreasing differences in the vector t, user i increases her utility if she increases her slope in response to an increase in the slope of another user j. If U i is twice differentiable, then the supermodularity is equivalent to 4 S i is a sublattice of R M if t 2 S i and t 0 2 S i imply that tt 0 2 S i a n d t^t 0 …”

Section: Supermodular Gamesmentioning

confidence: 99%

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Pricing differentiated services: A game-theoretic approach

et al. 2006

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The goal of this paper is to study pricing of differentiated services and its impact on the choice of service priority at equilibrium. We consider both TCP connections as well as noncontrolled (real-time) connections. The performance measures (such as throughput and loss rates) are determined according to the operational parameters of a RED (Random Early Discard) buffer management. The latter is assumed to be able to give differentiated services to the applications according to their choice of service class. We consider a service differentiation for both TCP as well as real-time traffic where the quality of service (QoS) of connections is not guaranteed, but by choosing a better (more expensive) service class, the QoS parameters of a session can improve (as long as the service class of other sessions are fixed). The choice of a service class of an application will depend both on the utility as well as on the cost it has to pay. We first study the performance of the system as a function of the connectionsÕ parameters and their choice of service classes. We then study the decision problem of how to choose the service classes. We model the problem as a noncooperative game. We establish conditions for an equilibrium to exist and to be uniquely defined. We further provide conditions for convergence to equilibrium from nonequilibria initial states. We finally study the pricing problem of how to choose prices so that the resulting equilibrium would maximize the network benefit.

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Section: Introductionmentioning

confidence: 80%

Section: Supermodular Gamesmentioning

confidence: 99%

Section: Supermodular Gamesmentioning

confidence: 99%

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Pricing differentiated services: A game-theoretic approach

et al. 2006

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“…If echo is properly controlled (which we can safely assume in modern day applications), the term I d remains practically constant for a one-way delay below 150 ms. If this delay (also termed interactivity bound) is exceeded, I d increases (and R decreases) by about 1 point on the R-scale per 10 ms additional delay [10]. The term I e includes the effect of using a low bit rate codec and the impact of packet loss.…”

Section: Qoe Frameworkmentioning

confidence: 99%

Techniques for Measuring Quality of Experience

Kuipers

Kooij

Vleeschauwer³

et al. 2010

Lecture Notes in Computer Science

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Abstract. Quality of Experience (QoE) relates to how users perceive the quality of an application. To capture such a subjective measure, either by subjective tests or via objective tools, is an art on its own. Given the importance of measuring users' satisfaction to service providers, research on QoE took flight in recent years. In this paper we present an overview of various techniques for measuring QoE, thereby mostly focusing on freely available tools and methodologies.

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“…Ie includes the distortion caused by low bit rate codec operation as well as the effect of packet loss (both network and late loss). Due to its ease of deployment, many other researchers such as [20] [21] and [18] have adopted it for assessing speech quality.…”

Section: Itu E-modelmentioning

confidence: 99%

An Evaluation of Delay-Aware Receiver Playout Strategies for VoIP Applications

Melvin¹,

Murphy²

2004

Lecture Notes in Computer Science

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Abstract. Previous work by the authors confirm the feasibility of implementing a delay-aware receiver buffering strategy based on synchronised time within VoiP applications. Our objective in this paper is to extensively test this delay-aware approach, termed the hybrid playout strategy over diverse networks using a combination of simulation and delay emulation. We utilise both measured delay data and derived delay models and quantify the significant performance gains through use of the ITU-T E-model. We also analyse recent Internet delay studies to further assess the hybrid's wider applicability.

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Assessing voice quality in packet-based telephony

Abstract: Delay, echo, codec type, and packet loss all come into play in achieving the quality of PSTN calls in packet-based telephony.

Cited by 52 publications

References 2 publications

Pricing differentiated services: A game-theoretic approach

Pricing differentiated services: A game-theoretic approach

Techniques for Measuring Quality of Experience

An Evaluation of Delay-Aware Receiver Playout Strategies for VoIP Applications

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