AN ARQ POLICY FOR A DATA COMMUNICATION SYSTEM WITH INTERMITTENT FAULTS

摘要

Some faults in a communication system occur intermittently, and consequently, become permanent failures from hidden faults. The data transmission often may fail for the causes of hidden faults and permanent failures, and then, the ARQ (automatic-repeat-request) scheme is adopted. If all retransmission of N times fail, the system is checked and maintained, and returns to a normal condition. The above procedure is repeated until the success of data transmission. Forming the generating function of probabilities that the retransmissions fail at k times successively, the mean time to the success of data transmission is derived. An optimal number N* which minimizes the mean time is discussed.