Data transmission apparatus and method with automatic repeat request

摘要

A sending data transmission apparatus is disclosed which comprises: means for memorizing at least one structure data piece of a data processing device in a receiving data processing apparatus; means for computing a transmission error detection code from the structure data memorized in the memory means; means for attaching the transmission error detection code computed by the transmission error detection code computation means to the structure data memorized in the memory means; means for transmitting the structure data to which the transmission error detection code is attached by the transmission error detection code attaching means to the receiving apparatus; means for receiving retransmission request for each structure data piece returned from the receiving apparatus when a transmission error is detected based on the transmission error detection code and structure data transmitted by the transmission means; and means responsive to the retransmission request for each structure data piece received by the reception means for retransmitting the corresponding structure data piece to the receiving apparatus. <IMAGE>