| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
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| Outline of Final Research Achievements |
The achievements of this project are summarized as follows: 1) The difference between a peer-assisted content delivery network (PA-CDN) and an ordinary CDN is the presence of stream forwarding by a relay peer, and it is known that the network capacity (i.e., the maximum number of viewers) increases as the number of forwarding peers increases. By this perspective, we clarify the theoretical limits of such trade-offs between the number of hops and delivery capabilities; 2) we extend theoretical results under stable situations to reveal performance limits in various realistic situations, such as with and without delivery support of cloud servers and the existence of flash crowd; 3) we propose a method to suppress the performance degradation due to network congestion and the leave of relay peers, and minimize the period of such a performance degradation.
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