2007 Fiscal Year Final Research Report Summary
A Study on Enhancement of User-Level QoS by Utilizing Mutually Compensatory Property of Multimedia
| Project/Area Number |
17360179
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
TASAKA Shuji Nagoya Institute of Technology, Graduate School of Engineering, Professor (80110261)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Yoshihiro Nagoya Institute of Technology, Graduate School of Engineering, Associate Professor (50335098)
NUNOME Toshiro Nagoya Institute of Technology, Graduate School of Engineering, Assistant Professor (10345944)
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| Project Period (FY) |
2005 – 2007
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| Keywords | audio-video IP transmission / mutually compensatory property / user-level QoS / application-level QoS / QoS estimation / IEEE802.11 / multipoint-to-multinoint IP communications / user-level QoS guarantee |
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| Research Abstract |
This research deals with user-level QoS of audio-video IP transmission. The research results can be classified into the following five categories.
1.The first subject is quantitative assessment of user-level QoS. We have studied the effect of monitor size, a scheme of continuous-time assessment and multidimensional assessment.We have also proposed a real-time estimation scheme using video spatial quality and audio-video temporal quality.
2.We have investigated how the MAC protocols in IEEE802 11 affect application-level and user-level QoS A method for testing the feasibility of user-level QoS has been proposed for DCF and EDCA with and without media synchronization control. EDCA with TXOP-Bursting was evaluated in error-prone environments. We also proposed a method for user-level QoS guarantee with-HCCA and showed its effectiveness. In addition, we applied DCF and EDCA to ad hoc networks and evaluated QoS
3.We have assessed user-level QoS in multipoint -to -multipoint TV conferencing applications with a multidimensional metric as well as a scalar one.
4.We have studied a method of enhancing user-level QoS in bandwidth-guaranteed IP networks by utilizing the mutually compensatory property. Under the condition that the total guaranteed bandwidth of the audio-video streams is constant, we clarified how we should allocate the bandwidth between audio and video according to the content type in order to maximize the user-level QoS.
5.We have proposed a SIP-based session control method that provides a mechanism to achieve desirable user-level QoS, which is referred to as GPSQ (Guarantee of Psychologically Scaled Quality). We implemented GPSQ in a simple experimental network and confirmed its effectiveness
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Research Products
(73 results)
