Patent ID: 6992981

Claim:
A communication system capable of avoiding congestion in transmission of moving image data, comprising: at least one receiving terminal; a moving image delivery device for delivering moving image data to said at least one receiving terminal; a moving image conversion device including at least one moving image conversion means for converting, in accordance with conversion parameters, the moving image data sent from said moving image delivery device, a conversion parameter setting means for determining the conversion parameters, and a monitored result receiving means; and at least one packet switching node including at least one data storage means for preliminarily storing the moving image data from said moving image conversion device to be sent to said at least one receiving terminal, a data amount monitor means for monitoring an amount of the moving image data stored in said at least one data storage means to judge that the monitored data amount reaches a first threshold, and a monitored result sending means for sending a congestion preview information to said moving image conversion device when said data amount monitor means judges that the monitored data amount reaches the first threshold, said monitored result receiving means receiving the congestion preview information from said monitored result sending means, said conversion parameter setting means determining the conversion parameters so that said moving image conversion means converts the moving image data sent from said moving image delivery device into a moving image data with a smaller coding bit rate smaller.