Abstract
This paper proposes a new analytical model of a multiservice switching network with overflow links in the first stage and resource reservation for selected call classes in output directions. The proposed model assumes that both the overflow mechanism and the resource reservation mechanism can be used in a number of selected, or all, classes of calls. A particular attention is given to the way the effective availability parameter for networks with overflow links in the point-to-point selection mode is determined. The proposed model makes it possible to determine dependencies between the internal blocking probability, capacity of overflow links, and the number of reserved resources for call classes to be analysed. Simulation experiments confirm high accuracy of the proposed method and potential applications of the model in engineering issues.
Highlights
Switching networks are the most important element of network nodes and significantly influence the effectiveness of telecommunication networks
We will describe the method for a determination of functional dependencies F and G (steps (5) and (6) in the IPPD algorithm) for multiservice switching network with overflow links and reservation mechanism implemented in output directions of the switching network
The introduction of overflow links leads to a significant reduction in the phenomenon of the internal blocking, whereas the reservation mechanism leads to an introduction of differentiated service conditions for different classes of calls
Summary
Switching networks are the most important element of network nodes and significantly influence the effectiveness of telecommunication networks. One of the most effective ways for decreasing the internal blocking probability in the switching network is the application of the so-called overflow links [13, 14] This method is based on an introduction of additional links between inputs and outputs of neighboring (adjacent) switches of this stage of the network to which the overflow mechanism has been introduced. References [14, 18, 19] prove (using simulation and analytical methods) that an introduction of overflow links between neighboring (adjacent) switches of the first stage in a multiservice switching network leads to the maximum decrease of the level of the internal blocking probability for selected or all call classes and can lead to an increase in the number of serviced real time connections. The call will be lost due to the internal blocking
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