Patent ID: 6445679
Filing Date: 2002-09-03
Classification: H04L,Y02D

Abstract:
A stream communication system comprising:a plurality of nodes including a transmission node which is a leading stage of a stream transfer system and a reception node which is a final stage, and a network to which each node is connected, each of said plurality of nodes has a stream transfer device with the function of receiving and transmitting an encoding stream which is divided into data blocks, data attribute information showing a data attribute in each data block is added, and a data structure has a periodicity, at least one node is allocated as a managing node among said plurality of nodes, said managing node manages at least one node as a control target node among said plurality of nodes, and manages at least one node located in the downstream of said control target node as a monitoring target node among said plurality of nodes, said stream transfer device of said control target node comprises: means for detecting an encoding cycle by analyzing said encoding stream; means for obtaining a data priority from said data attribute information on each data block of said encoding stream; means for measuring an amount of the transmission data every said encoding cycle; means for controlling a transmission permission priority which is a first threshold used for transmission and judgment of the annulment of a data block based on results of the amount of the transmission data at a previous cycle; means for controlling the number of transmission permission blocks which is a second threshold used for transmission and judgment of the annulment of a data block based on results of the amount of the transmission data at a previous cycle; and stream conversion means for adjusting the amount of the transfer data by comparing the data priority of each said data by comparing the data priority of each said data block with the first threshold and the second threshold, when said encoding stream is transmitted to a next stage node, to coincide with the transmission rate for which the effective transmission rate is specified, the stream transfer device of said monitoring target node comprises internal state notification means for measuring a load state in the node, and for notifying said managing node of a measurement result as an informative message of an internal state, and the stream transfer device of said managing node comprises feedback control means for recalculating a transmission rate based on the load state notified from said monitoring target node and the transmission rate currently set, and for updating the transmission rate setting by notifying said control target node of the result as a parameter setting message.