Patent ID: 8527610
Filing Date: 2013-09-03
Classification: G06F,H04L,H04N

Abstract:
1. A cache server control device which is used for a content distribution system, said content distribution system comprising: wherein said cache server control device comprises: a distribution band acquisition unit which acquires a distribution band, for when concurrently distributing said contents to be reproduced to said plurality of client terminals in response to a plurality of distribution requests issued for said contents to be reproduced, respectively for said plurality of contents to be reproduced; and a cache control unit which updates the number of units of cache servers necessary for storing said contents to be reproduced, by comparing said load information acquired by said distribution band acquisition unit with a threshold value determined in a multi-level manner, wherein said cache control unit is configured to use: a first threshold value of said threshold value when the number of units of said cache servers, for storing said content to be reproduced related to the judgment is increased; and a second threshold value of said threshold value, being smaller than the first value, when the number of units of said cache servers, for storing said content to be reproduced related to the judgment is decreased, wherein at least one of said plurality of contents to be reproduced has a bit rate different from that of the other contents to be reproduced, and said load information representing distribution load represents a distribution band necessary, for when concurrently distributing said contents to be reproduced to said plurality of client terminals in response to a plurality of distribution requests issued for said contents to be reproduced.