Traffic analysis of an integrated voice/data system by means of pseudo‐data call concept

Abstract

Since the model for the voice/data multitraffic processing system was proposed, various analyses have been made for the system. However, the traditional analysis derived only the average and the variance of the data call queues. A general and practical method of analysis has not been presented for the waiting time distribution of the data calls, which is important as the service criterion. This paper proposes an approximate method of traffic analysis for the integrated voice/data system, which is applicable to data calls with the holding time following the general probability distribution. The method is to represent the holding time distribution of the data call following the general probability distribution as a sum of several pseudo‐data calls following exponential distributions. By this method, not only the average waiting time but also the distribution of the waiting time can be calculated relatively easily. As in the design for a voice communication network, the integrated network can be designed so that the given service criterion is satisfied by 99 percent of the data calls in the data system. As an example, the case of facsimile as the data source is examined. The result by the proposed method agreed well with the result of simulation, indicating that a practically sufficient accuracy is realized.