VoIP Accounting Model: Using the Gap Ratio as a Quality Metric

Younchan JUNG  J. William ATWOOD  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.9   pp.2638-2641
Publication Date: 2011/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2638
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
Keyword: 
VoIP,  quality of service,  burst,  gap ratio,  quality metric,  accounting model,  

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Summary: 
Providing quality-of service (QoS) guarantees in VoIP applications has become an urgent demand in wireless and mobile networks. One of the important issues is to find a simple quality metric fitted to low power mobile devices such as smart phones. This paper considers the gap ratio (the proportion of the accumulated gap periods over the whole call session) as a simple quality metric. Our study aims to find the optimum packet count threshold between two adjacent lost packets (referred to as Gmin in RTCP-XR), which is needed for the purpose of identifying whether the current packet at the receiver belongs to the gap state or the burst state, because quality prediction errors depend on the Gmin value when the gap ratio is used as a simple quality metric. Based on this metric, we propose an accounting model that can be a candidate accounting metric useful for a quality-based accounting mechanism.