The Methods and the Feasibility of Frame Grouping in Internet Telephony

Hyogon KIM  Myung-Joo CHAE  Inhye KANG  

IEICE TRANSACTIONS on Communications   Vol.E85-B   No.1   pp.173-182
Publication Date: 2002/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Internet Technology II -- Traffic Control and Performance Evaluation in the Internet)
IP telephony,  frame grouping,  delay prediction,  bandwidth reduction,  

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Grouping multiple voice frames into a single IP packet ("frame grouping") is a commonly mentioned approach to saving bandwidth in IP telephony. But little is known as to when, how, and how much frame grouping should be done in Internet environment. This paper explores the feasibility and the methods of frame grouping based on Internet delay measurement. Specifically, we propose an adaptive frame grouping method that minimizes the delay violation while reducing the bandwidth usage by as much as a factor of two under real Internet delay fluctuations. The performance of the method is evaluated as it is used against a single voice stream and then against multiple voice streams.