Patent ID: 9331924
Filing Date: 2016-05-03
CPC Classification: H04L

Claim Text:
1. A distribution route construction method comprising: transmitting, in a data distribution system, at least one check packet to a plurality of terminals within a network from a check packet transmission terminal; checking whether each of the plurality of terminals transmits a reply packet in reply to the check packet; grouping, when the reply packet is not received from at least one of the plurality of terminals, the plurality of terminals into a first terminal group including a first terminal whose reply packet reaches the check packet transmission terminal and a second terminal group including a second terminal whose reply packet does not reach the check packet transmission terminal; changing a designation terminal for data communication to reduce communication data traffic between the first terminal group and the second terminal group; reconstructing distribution routes based on the checking and the changing; and setting a flag indicating that the number of check packets to be transmitted to each of the plurality of terminals are increased in a next check when reply packets have been received from all of the terminals to which check packets have been transmitted.