Patent ID: 6434623
Filing Date: 2002-08-13
Classification: H04L

Abstract:
A data transmission apparatus in a data communication systems having the data transmission apparatus for transmitting data through a communication channel and data receiving apparatuses receiving data transmitted through the communication channel, said data transmission apparatus and said data receiving apparatuses being connected to each other through the communication channel, said data transmission apparatus comprising:first file transmission means for transmitting to one of the data receiving apparatuses a data file including data, total volume information of the data, and a program, said program being operative in the data receiving apparatuses and adapted to execute processes comprising: a data volume comparison processing to compare volume of received data in a data receiving apparatus with the total volume information, responsive to a shortage in the volume of the received data based upon the comparison, to generate a shortage data volume by calculating a difference between the total volume information of the data and the volume of the received data, and with notices to notify the data transmission apparatus of the shortage data volume, and a data integration processing in which a shortage data portion, transmitted from the data transmission apparatus in response to the notices from the data receiving apparatuses, is integrated with the received data using position information of the shortage data portion in the transmitted data; a shortage data generating means for generating, responsive to the notices, position information of a shortage data portion in the transmitted data by calculating a difference between the total volume information of the data and the shortage data volume from the notices, and generating the shortage data portion based upon the generated position information and having a volume based upon the shortage data volume from the notices; and second file transmission means for transmitting the shortage data portion to a data receiving apparatus which has issued the notices.