Order program data distribution system

Abstract

The invention provides a mixed type data distribution system combining multicast distribution and unicast distribution, which prepares a multicast distribution server and a unicast distribution server that are provided with the same content data. Moreover, various functions such as receiving control function, multicast receiving function, unicast receiving function, regeneration control function and data reproduction function are arranged in a user terminal. The multicast distribution server processes content distribution via multicast in a certain interval. When content distribution requests from users exist, the user terminal immediately begins to receive the multicast distribution started currently, and at the same time separately receives data which is missed in the multicast distribution data from the beginning to the moment of starting to receive via unicast. The users firstly begin to view in unicast data, changes halfway to stored multicast data to view.

Description

technical field [0001] The invention relates to an on-demand data distribution system. Background technique [0002] Conventionally, unicast communication from a server to a terminal has been utilized in distribution of on-demand data (moving content). Since unicast communication is one-to-one communication, it is necessary to perform individual distribution on each terminal. [0003] Also, a distribution device that performs multicast distribution is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-135239. [0004] The disclosed distribution device returns a distribution approval packet including a multicast address from the distribution device to the reception device when there is a distribution request from a new receiving device when the distribution device performs multicast distribution. The receiving device notifies the distribution device of the serial number of the first received content information packet, and requests the distributed dat...

AI Technical Summary

Problems solved by technology

[0006] In the on-demand data distribution, since the unicast communication from the server to the terminal is utilized, the communication traffic increases when there are a large number of distribution requests, thus placing a load on the network and a large load on the server at the same time

Countermeasures such as distributing servers or compressing data have been considered, but when a large number of distribution requests for high-quality data occur from users in a wide area, distribution has to be restricted

Multicast-based 1-to-N communication is also considered to improve distribution efficiency, but because it is distributed in real time, even if it can start receiving from the middle, it cannot be received from the beginning by all users, so there is a problem that cannot be applied to each user The case for on-demand distribution of requests

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