This paper shows the modeling of decision-making processes to ensure stable operation of multiservice communication networks (MCNs) using the mathematical apparatus of fuzzy logic models. A classification of the main factors affecting the stability of an MCN is given. The main factors affecting the structural stability of MCNs are external factors, internal factors, energy factors, and maintenance factors. A decision-making strategy (DM) was chosen. The main factors that affect the stability of the functioning of an MCN are characterized by heterogeneity. Therefore, the task of the DM to ensure stability of the functioning of the MCN was reduced to producing a sequential solution of the following interrelated tasks: identification of the MCN by a systematic analysis of the main factors affecting the stability of the MCN, ranking the states of the MCN, and definition of the decision-making criteria. The first point is implemented by setting up a complex model of the MCN based on integration of the principles of fuzzy set theory (FST). A promising method for choosing a rational alternative is the method of non-dominated alternatives (MNDA), based on the aggregation of fuzzy information to characterize the relationship between the alternatives according to certain criteria.
Abstract:In this article the questions of the system research of reliability indexes of the infocommunication network with distributed structure are considered. As a criterion proposed use the reliability index, based on reliability state of each level of the considered network. Showed that development of methods and algorithms of system research of reliability indexes of the infocommunication network in terms of workload of its components is one of the main problems in the design of network with a complex structure. The model that allows a system approach to research the reliability indexes of the infocommunication network are proposed. The infocommunication network with a distributed structure are introduced as a system consisting of K interacting subsystems (level). The main factors of reliability state of equipments (gateways, routers, switches, Softswitch and other) of each lever are described by vector-functions. By these vector-functions given own reliability operators of infocommunication network. Keywords: infocommunication network, next generation network, quality of service, softswitch, reliability, coefficient of availability, coefficient of downtime, reliability processes, index of reliability, stationary coefficient of availability, time to failure, reliability state, vector-function, functionality of network, reliability operators, communication channels. IntroductionFunctional model of modern infocommunication network (IN) with a distributed structure (or a next generation network-NGN) model can be represented by 4 levels: the level of access; the level of transportations of data (transport layer); the level of network management; the level of service management ( At the level of the access edge connect is subscriber and terminal to the network on the basis of the application of various machine-tools and a transformation format of output data in the appropriate format used to transfer in the transport network. At the transport level, by providing customers a consistent and integrated platform of information transmission with high reliability and high quality of service (QoS). At this level routers and IP switches, which are located in different points of the transport network and are connected via the trunk channels with large enough bandwidth capabilities (Semyonov, 2005). The main task of the level of network management is to ensure flexible switching, that is used for call control and manages the installation of connections in real time. Softswitch is the main device, effecting the level of control switching and transmission of information. At the management level of services is mostly the offer services and support of functioning of the network at a set of connections.A characteristic feature of IN with distributed structure is the heroine: the use of packet technology for transferring all types of information; application of commutation systems with distributed architecture; the division of functions support services from switching and transmission; ensuring the opportunities of broadband ac...
Abstract:The article describes the main elements that make up the transport network NGN. Shows the relevance of research of reliability of the NGN network, as well as the need of numerical calculation of complex indexes of reliability of tracts of transmission of packet information is given. On the developed imitating model of the NGN network indexes of reliability of tracts of transmission of packet information are calculated when using mechanisms of reservation, and also at their absence. Numerical calculation of the main indexes of reliability (failure rate λ, average time of restoration of communications of Т в , average time of a time between failures Т о , К г the coefficient of availability, probability P(t) of no-failure operation in the range of t, coefficient of operational readiness R г ) the NGN network equipment (router, switch) for the main period of operation is given. By the received results conclusions are makes. Keywords: network of the following generations, transport network, public communication network, softswitch, reliability of the NGN network, complex indexes of reliability, the reservation mechanism, tract of transmission of packet information, fault in the equipment of NGN network. IntroductionThe basis of NGN (Next Generation Network) is made by a universal transport network with switching of the packets, realizing functions of transport level and level of management of switching and transmission.A part of the transport NGN network can be: the transit nodes which are carrying out functions of transmission and switching; the terminal (boundary) nodes providing access of subscribers to a multiservice network; the controllers of the alarm system which are carrying out functions of information processing of the alarm system, management of calls and connections; the locks, allowing to carry out connection of traditional communication networks (PSTN -public switching telecommunication network, NDT -network of data transmission, CNMS-communication network of mobile stations). Controllers of the alarm system can be taken out in the separate devices intended for service of several nodes of switching. Terminal and transit nodes of a transport network can carry out functions of nodes of services, i.e. the structure of functions of boundary nodes can be expanded thanks to addition of functions of service. For building of such nodes is used the technology of flexible switching (Softswitch). (Goldshteyn et al., 2011).
This article summarizes the main points of the algorithm and program for calculating the structural reliability of the NGN network using a statistical simulation method, which allows the designer for a short time to analyze the reliability of the designed network.
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