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Layering and reconfigurable on-chip network modeling and simulation system

The invention discloses a layering and reconfigurable on-chip network modeling and simulation system. The system comprises a test layer, a main body layer and an operation layer. The core of the test layer is a reconfigurable rout unit and a network interface unit, and the test layer can change network structure parameters dynamically. The main body layer is mainly composed of a resource node unit, is provided with a universal OCP interface which is connected with the route unit through the network interface unit and integrates a flow generation mechanism unit, a receiving mechanism unit and a performance analysis logic unit. The operation layer is composed of a software configuration module, provides a good person-to-person interaction interface, and is used for flexible configuration and structure generation of the on-chip network structure feature parameters and communication modes. The layering and reconfigurable on-chip network modeling and simulation system can conduct modeling on an on-chip network architecture structure utilizing different topological structures, network sizes, routing algorithms, buffer area depths and the like, conduct network performance simulation under different communication models and communication loads, and provide a basis for the on-chip network architecture design under different application demands.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Data Unit Sender Control Method

InactiveUS20070280107A1Increase congestion windowEfficient flow controlEnergy efficient ICTError prevention/detection by using return channelTransmitterPlace Identifier
A method of controlling a data unit sender is described. A flow control procedure for controlling the flow of data units sent by said data unit sender is conducted in dependence on acknowledgement messages from the receiver The flow control procedure utilizes (S103) at least one output limiting parameter (olp; cwnd) for placing a limit on the data units sender's current data send rate. A procedure is provided for detecting (S110) a data unit loss indication, in response to the detection of a data unit loss indication, performing (S311) a retransmission, subsequent to said retransmission (S311) waiting (S312) for an acceptable acknowledgment message carrying the sequence position identifier indicative of said data unit indicated as potentially having been lost, and distinguishing (S317) whether said acceptable acknowledgment message relates to an original transmission, and in response to distinguishing that said acceptable acknowledgment message does not relate to said original transmission, performing (S318) a congestion response step, while in response to distinguishing that said acceptable acknowledgment message relates to said original transmission, said output limiting parameter is adapted (S319) based on one or more duplicate acknowledgment messages received since receiving the last acceptable acknowledgment message that precedes the acceptable acknowledgment message carrying the sequence position identifier indicative of said data unit indicated as potentially having been lost.
Owner:TELEFON AB LM ERICSSON (PUBL)
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