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...
The article suggests transporting packets of heterogeneous traffic in a multi-service network on the basis of a Software Defined Networks (SDN). The optimization problem of transmitting flows of heterogeneous traffic at the level of the SDN infrastructure in case of its load is formulated. The criterion used is the total delay time of the threads. Development of algorithms for search and analysis of traffic flows.
Abstract. In this article formalized an optimization problem of distributed the resources allocated to ensure of reliability components of the infocommunication network, based on the methodology of the technical and economic concept of optimization of information systems. This article proposes a resource allocated for the ensuring of reliability indexes of IN, rationally allocate between the levels of the network. Minimized the sum of the expenditure required to improve the reliability and losses of the company, arising from the residual unreliability of network components with its functioning within a certain time T. Resulted a formal description of optimization problem. Algorithmic support described problem is a set of interrelated models that have a hierarchical structure. Means of solving the problem is to create a set of mathematical and simulation models based on theory of mass of service. Optimal solution is achieved by combining the models into a single system covering all the tasks. Keywords: infocommunication network, reliability index, resources minimizing, coefficient of availability, reliability state, vector of structural parameters, description of optimization problem, vector of the service level, algorithmic support, integrated circuit structure, hierarchical structure, stochastic viewing options. IntroductionIn Nishanbayev and Muradova (2014) proposed a model that allows fromsystem position to investigate of reliability indexes of the infocommunication network (IN) with a distributed structure, whose essence consists in the presentation of components of the IN as subsystems representing independent levels and perform particular functions in packet regime with a given quality of service. In this article determined the expediency of reliability indexes of IN on bases of systematic approach taking into account the reliability states of each level of the network.This article proposes a resource allocated for the ensuring of reliability indexes of IN, rationally allocate between the levels of the network. In other words, it is proposed to minimize the resources available to provide the required reliability of taking into account the cost of IN losses of the company, arising from the residual unreliability of network components.When the user requests, usually involving all elements of IN and unreliable operation of at least one element can negate all the work performed by other components of the network. Malfunctions and failures in the network canals and gateways, in the centers of routing and switching systems, in the systems of processing and storage of information, as well as systems of management network resources lead to malfunction, both operators and all users (customers), which leads to large losses of companies offering different types of services. Therefore, in the operation of IN required to ensureunrefusal operation of all its components.
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