METHOD FOR CONTROLLING FLOW BY USING ACTIVE NETWORK TECHNIQUE IN MULTIPOINT COMMUNICATION

摘要

PURPOSE: A method for controlling flow by using an active network technique in multipoint communication is provided to provide the scalability even though receivers are increased or are in a wide area, and minimize packet loss in even case that congested situation is generated within a network. CONSTITUTION: Data packets arrive at receivers and intermediate nodes(201). It is determined whether the packets are the first arrived packets of multicast communication(202). A soft storage in the node is initialized to start controlling multicast flow included in a program(203). Data packets arrived at the nodes, are saved at a buffer(204). An output port enabling transmission is searched(207). If data packet is in priority to be transmitted to the corresponding output port(208), data packet is duplicated ad transmitted to bottom nodes in case that the number of allowable credit to the corresponding bottom node is larger than 0(209). If the current node is the final receiver(205), packets are transmitted to an application layer and counter is increased by 1(206). If the counted value becomes a reference counter of flow control and a double number of credit update unit(211), the current node decides the amount of packets receivable from the top node based on the size of virtual buffer to each bottom node and generates credit packets including related information to the top node(213). It is determined whether data packets were transmitted to all corresponding output ports or the application layer(214).