Estimating Environment-Independent Parameters on Basis of Comparative Assessment of User's Subjectivity

Yasuhiro SATO  Shin'ichiro KITANO  Shingo ATA  Ikuo OKA  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.8    pp.2265-2273
Publication Date: 2011/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2265
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
subjective assessment,  comparative evaluation,  quality of service,  bulk transmission,  

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We analyze subjective assessments by comparative evaluations of bulk data transmission by using two psychological methods (the method of successive categories and the constant method). From the results of the first experiment, the thresholds at which participants downloading a data file began to feel dissatisfaction with service degradation are 15.7 Mbps and 11.6 Mbps obtained by the two different methods when the throughput without the service degradation is approximately 22 Mbps. In the second experiment, we investigate the threshold of user satisfaction for various network environments. The threshold is 63% of the throughput of the user's usual network environment. Moreover, from the viewpoint of download time, users feel dissatisfaction with the quality when download time becomes 1.5 times longer. These values can be used to more effectively allocate network resources and thereby achieve higher service quality.