Nippon Telegraph and Telephone Corporation

Takuto Kimura

Arifumi Matsumoto

Masahiro Yokota

Taichi Kawano

Hideaki Kinsho

Kazuhisa Yamagishi

Hiroshi Yamamoto

Kazumichi Sato

Tatsuaki Kimura

Ken Nishimatsu

Kei Takeshita

Aomi Jokoji

A moving image control apparatus is a control device that realizes bitrate control in a moving image streaming service, which includes a calculation means for calculating a quality target value used for the bitrate control such that a utility function including a predetermined engagement index value is optimized through Bayesian optimization.

Control apparatus, control method, and program

A routing control device of the present invention includes: a storage unit that stores, for each IP address block, a next hop, information on a route to the IP address block, and quality information regarding the route; a quality requirement determination unit that receives communication data bound for a communication destination host and determines a quality requirement of the communication data; and a next hop selection unit that references the storage unit and selects a next hop for the communication data based on quality information regarding a route to an IP address block to which an IP address of the communication destination host belongs and the quality requirement.

Route control apparatus, route control method and program

A control apparatus includes an acquisition unit that acquires application information related to at least one of a plurality of sessions at a plurality of timings for each of the plurality of sessions related to a plurality of types of applications that are communicating in a network, a search unit that searches for an allocation band of each of the plurality of sessions at the plurality of timings based on a QoE prediction value of each of the plurality of sessions derived from the application information and a condition for a band of the network, and a control unit that controls allocation of a band for each of the plurality of sessions at the plurality of timings based on the allocation band searched by the search unit.

Control apparatus, control method and program

A server selection devices includes: an acquisition unit for acquiring, regarding each of a plurality of servers having the same content, a list of quality information corresponding to communication environment information regarding a source of request for download of the content; and a selection unit for selecting one of the plurality of servers based on the list of the quality information regarding each of the plurality of servers and a cost associated with download of the content. Thus, a destination of a content download request can be selected while giving consideration to not only quality but also cost.

Server selection apparatus, server selection method and program

A server selection device includes: an acquisition unit that acquires communication environment information indicating communication environment and quality information indicating communication quality for each of communications made regarding each of a plurality of servers that are candidates for distribution of content to a client; a calculator that calculates a score reflecting probabilistic deterioration in communication quality for each of combinations between a server and communication environment information based on a history of the communication environment information and the quality information acquired by the acquisition unit; and a selector that selects a server to deliver content to the client based on the score calculated by the calculator, thereby enabling the selection of a server less likely to affect the quality of experience.

A delivery rate selection device, for selecting a delivery rate when delivering a video image from a video delivery server to a client in a video delivery service. When a delivery rate calculating unit receives from an inquiry source an inquiry of delivery rate for delivering a video image to a given user, a delivery rate calculating unit acquires presence or absence of a playback stall tolerance and presence or absence of an image quality deterioration tolerance of the given user from the user characteristic storage unit, selects an encoding rate from a plurality of encoding rates of the video image according to a combination of the presence or absence of a playback stall tolerance and the presence or absence of an image quality deterioration tolerance of the given user, and returns the selected encoding rate as the delivery rate to the inquiry source.

Delivery rate selection device, delivery rate selection method, and program

A pacing control device to perform pacing control on a content distributed from a content distribution device that performs streaming-based content distribution, includes an obtainer configured to obtain a communication quality threshold that corresponds to a communication environment in the pacing control device; and a controller configured not to make a request for the content to the content distribution device in a case where a communication quality in the pacing control device is lower than the communication quality threshold, and to make the request for the content to the content distribution device in a case where the communication quality is higher than the communication quality threshold.

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Tokyo, Japan

Takuto Kimura