Abstract
Today, Ukraine is actively working on solving the problems of convergence of networks of various technologies, ensuring their compatibility in management, signaling and data traffic, providing users with modern services with specified QoS indicators. In the process of implementing 4G and 4.5G technologies in the networks of mobile operators, it turned out that the voice traffic service is possible only when using a core network with switching channels of 2G and 3G technologies. And in order for voice traffic to be serviced in batch mode, it is necessary to bring the network of the mobile operator in accordance with the requirements of the IMS architecture. The implementation of IMS provides a solution to two main tasks. The first is the solution to the problem of interaction between networks of various technologies at the level of signal flows. The second task is to ensure the interaction of networks of various technologies at the level of data flows. These tasks are solved at the control level, the main functional elements of which are the functional blocks CSCF, P-CSCF, I-CSCF, S-CSCF. When designing the IMS management level, it is necessary to determine the amount of traffic that will be served by these CSCF functional elements. Then, it is necessary to calculate the required performance of the elements for serving signal traffic and data streams. At the same time, it is very important to provide the required reliability indicators for the IMS management level. The article analyzes the functioning of the IMS core in solving problems of combining signaling traffic and data networks of various technologies. The list of the main elements involved in the process of solving management problems is determined. Models are proposed that allow calculating the amount of incoming traffic from heterogeneous networks and the amount of traffic after it is converted to the standard form of IMS architecture. To ensure the indicated reliability indicators of IMS, the use of methods of reservation of functional elements of the control level is provided. Models have been developed and analytical expressions have been obtained for calculating the values of reliability indicators using various reservation methods.
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Romanov, O., Nesterenko, M., Veres, L., Kamarali, R., Saychenko, I. (2021). Methods for Calculating the Performance Indicators of IP Multimedia Subsystem (IMS). In: Ilchenko, M., Uryvsky, L., Globa, L. (eds) Advances in Information and Communication Technology and Systems. MCT 2019. Lecture Notes in Networks and Systems, vol 152. Springer, Cham. https://doi.org/10.1007/978-3-030-58359-0_13
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