Integrated Services Digital Network Atm Switching Modeling Research

With the massive development of information, the input-queued switches, which is easier to realize, are more preferable than the output-queued ones in the B-ISDN. As a success of the former study on "human power priority" and "space priority", we discuss the performance of the input-queued ATM switches with "time priority" control mechanism.Caused by the strict FIFO service rule, HOL cell block is the very disadvantage of the input-queued ATM switches. To solve the problem, two things should be considered, that is the selection of scheduling strategy 'and the decision of switch structure. Based on the timely summarization on A TM switch, in the thesis, we have detailed most of the scheduling strategy and improved switch structure relevant to input-queued switches, and by the overall analysis of the cell sending procedure, we presented a system model named time priority scheduling input-line group output with muti-channel model. With the setting of the peculiar conditions, we contribute the above system model for the first time to a kendall model, i.e./ L,:The size of buffer 1 / FCFS (for same kinds of cells)/ L2:The size of buffer 2 / Non-Prevail PR (for different kinds of cells)We resolved the model by "state transfer" method. The final simulation experiment shows that the new model can better the HOL block, and improve the performance of input-queued ATM switch dramatically.