EVALUATION OF SIMULATION RESULTS OF DATA TRANSMISSION MODELING ON A CHANNEL WITH RANDOM ACCESS

Abstract

The subject of the article is the evaluation of the results of a mathematical model consisting of systems of equations that describe the various states of the system and the laws of distribution of packet service time, which allows to investigate the main probability-time characteristics and analyze the operation of a single device. The purpose of the article is to evaluate the results of a mathematical model of the operation of a data network with competing access based on a switching device with a finite buffer size. To achieve the maximum probability, it is necessary to use switches with the optimal size of the buffer, so that the delay was small, and the buffer did not overflow too quickly at high load of the switch, which is the task of this article. A mathematical model consisting of systems of equations describing different states of the system and packet service time distribution laws is proposed, which allows to investigate the main probability-time characteristics and analyze the operation of a single system device and its interaction with other network devices based on the density of the probability distribution of packet service time. The final result is the obtained distribution densities of packet delivery time for different operating modes of the system that can be approximated by the corresponding analytical distribution law. The model allows to calculate the probability of data delivery, taking into account the final size of the buffers used by the data. The conclusion can be considered that, for achievement of the maximum probability it is necessary to use switches with the optimum size of the buffer that both delay was small, and the buffer is not overflowed too quickly at high loading of the switch. Thus, with the help of the developed model it is possible to solve the problem of choosing the optimal size of the switch buffer and estimating the data delivery time. Since buffer overflow leads to loss of information frames, which, in turn, leads to increased packet delivery time.