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Titolo:
PACKET AUDIO PLAYOUT DELAY ADJUSTMENT - PERFORMANCE BOUNDS AND ALGORITHMS
Autore:
MOON SB; KUROSE J; TOWSLEY D;
Indirizzi:
UNIV MASSACHUSETTS,DEPT COMP SCI AMHERST MA 01003 UNIV MASSACHUSETTS,DEPT COMP SCI AMHERST MA 01003
Titolo Testata:
Multimedia systems
fascicolo: 1, volume: 6, anno: 1998,
pagine: 17 - 28
SICI:
0942-4962(1998)6:1<17:PAPDA->2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Keywords:
PACKETIZED AUDIO; PLAYOUT DELAY; MULTIMEDIA; PACKET LOSS; DYNAMIC PROGRAMMING; COMPUTER NETWORKS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
CompuMath Citation Index
CompuMath Citation Index
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
S.B. Moon et al., "PACKET AUDIO PLAYOUT DELAY ADJUSTMENT - PERFORMANCE BOUNDS AND ALGORITHMS", Multimedia systems, 6(1), 1998, pp. 17-28

Abstract

In packet audio applications, packets;Ire buffered at a receiving site and their playout delayed in order to compensate for variable network delays. In this paper, we consider the problem of adaptively adjusting the playout delay in order to keep this delay as small as possible,while at the same time avoiding excessive ''loss'' due to the arrivalof packets at the receiver after their playout time has already passed. The contributions of this paper are twofold. First, given a trace of packet audio receptions at a receiver, we present efficient algorithms for computing a bound on the achievable performance of any playout delay adjustment algorithm. More precisely, we compute upper and lowerbounds (which are shown to be tight for the range of loss and delay values of interest) on the optimum (minimum) average playout delay for a given number of packet losses (due to late arrivals) at the receiverfor that trace. Second, we present a new adaptive delay adjustment algorithm that tracks the network delay of recently received packets andefficiently maintains delay percentile information. This information,together with a ''delay spike'' detection algorithm based on (but extending) our earlier work, is used to dynamically adjust talkspurt playout delay. We show that this algorithm outperforms existing delay adjustment algorithms over a number of measured audio delay traces and performs close to the theoretical optimum over a range of parameter values of interest.

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Documento generato il 24/09/20 alle ore 03:22:15