Content

Introduction

Nowadays, a huge number of companies use personal computers to store and process any kind of information. This information is contained in databases. Databases play an important role in the developing world of technology. Everything that we interact with every day in life, most likely, is recorded in some kind of database. Working with databases is the most important skill in working with a computer, and specialists in this field are becoming more and more in demand. The main ideas of the current information methodology are based on the representation, according to which information should be located in databases with the task of displaying a dynamically changing world and meeting all the information needs of users. Databases are formed and run under the control of special software, called database management systems (DBMS).

1. Relevance of the topic

One of the most pressing scientific problems in the field of telecommunications is the transmission of real-time streaming traffic in compliance with a number of requirements for the quality of service. This is due to the fact that many data streams are transmitted over the network, the resources of which must be distributed among these streams in a certain proportion. Since the data to be transmitted are different in nature and importance, it is necessary to have mechanisms that allow solving the problem of resource allocation promptly, in accordance with the properties of those streams that are transmitted at a particular time through specific telecommunication nodes. Such mechanisms should be based on improved methods of resource allocation that have high scalability, speed, flexibility, low operational complexity and resource intensity. To improve the quality of service (QoS) of transmitted network traffic, it is urgent to search for flexible methods of managing network resources to ensure their balanced load and guaranteed quality of service for heterogeneous user traffic in multiservice networks. On the problems of developing methods of traffic management in multiservice communication networks, it is worth noting the works of A.V. Lemeshko, V.V. Petrov, B.S. Tsybakov, V.V. Ivanov, A.G. Lozhkovsky, O.I. Sidorova. , Yanfeng Zhang, Cuirong Wang and Yuan Gao. The works devoted to the methods of optimizing the efficiency of using network resources are mainly of a theoretical nature, associated with the creation of new control algorithms, which makes them difficult to implement in a real network of a telecom operator. Another drawback of existing methods is the use of an integrated approach to information flow management without taking into account the peculiarities of each type of traffic generated by various network applications. Improving the quality of service information flows are also partly achieved through hardware improvements - using buffer sorting memory or sorting networks. The existing technical methods of traffic management in network devices (shaping and policing) turn out to be ineffective in processing traffic. In particular, to reduce losses, the polishing algorithm requires an increase in the bandwidth of the channel, as a result of which its use decreases (utilization decreases), and the shaping algorithm introduces delays, which may be unacceptable when processing real-time streams. The software way to improve QoS indicators is to use combinations of basic queuing disciplines at the network level and improve the algorithm for managing information flows based on WRR (Weighted Round Robin) in telecommunication network nodes, including through the creation of their software counterparts. Thus, the expansion of the range of services, scaling of infrastructure and traffic volumes are constantly prompting to solve the scientific problem of improving the quality of service of streaming traffic in multiservice networks by improving the method of adaptive management of the structural parameters of the node and developing models of virtualization of the network device.

2. Purpose and objectives of the study, planned results

The aim of the presented dissertation work is to improve the quality of service of streaming traffic in a multiservice network based on dynamic control of the parameters of virtual network nodes and flexible allocation of computing resources of the router.

Achievement of this goal is carried out by solving the following tasks:

  1. 1. Analysis of modern solutions to ensure guaranteed quality of service in multiservice telecommunication networks.
  2. 2. Development of a model for static and dynamic virtualization of computing resources of a network device.
  3. 3. Developing an analytical model for a virtualized router
  4. 4. Development of a method for adaptive control of structural parameters of virtual routers.
  5. 5. Development of a simulation model of a router with virtualization and without resource virtualization to evaluate the efficiency of a network device under conditions of multi-stream traffic transmission.
  6. 6. Development of a software router model with a modular structure and automatic deployment of virtual nodes with the provision of the necessary resources and monitoring the performance characteristics.
  7. 7. Estimation of quality of service parameters for streaming traffic based on the proposed hardware and software solution in routers with virtualization support.

3.Scientific novelty of work

The novelty of the work lies in the fact that:

  • 1. For the first time, a structural and functional model of a network device with dynamic virtualization of computing resources is proposed, which allows describing the process of virtualization of routers with mutual optimization of a given level of quality of service parameters for certain types of service.
  • 2. For the first time, a mathematical model of the processes of functioning of a network device with virtual routers is proposed, which, in contrast to the known ones, can significantly reduce the mutual parametric influence of various types of traffic during transmission over the network and evaluate the quality of service using decomposition of the network node structure and further mathematical modeling based on systems theory and queuing networks.
  • 3. The method of adaptive control of structural parameters of virtual routers has been improved, which made it possible, on the basis of the developed software model of dynamic virtualization of router resources, to evaluate and improve the parameters of the quality of service of information traffic in a multiservice network.
  • 4. The software model of the router has been further developed, the novelty of which lies in the fact that, in contrast to the previously known models, it is possible to define virtual analogs of hardware routers with the minimum required amount of network resources to ensure a given level of quality of service, which makes it possible to reduce the time parameters of QoS of streaming traffic , providing confirmation of the accuracy of their estimates.

    • 3.1 Object of study

    the object of research is the process of servicing streaming traffic of a multiservice telecommunications network with the provision of quality of service.

    3.2 Subject of study

    The subject of the research is models and methods for improving the quality of service of streaming traffic in multiservice networks.

    3.3 Research methods

    Research methods. The theory of systems and queuing networks, analytical, simulation research methods, as well as methods of a full-scale experiment have found their application in the work.

    Findings

    As part of the research carried out:

    1. Relevance of the topic.

    2. The goal and objectives of the study are set.

    3. The novelty of the work has been proven

    List of sources

    1. Яновский Г.Г. Качество обслуживания в сетях IP // Вестник связи - 2008. - №1.

    2. Кучерявый Е.А. Управление трафиком и качество обслуживания в сети Интернет. - СПб .: Наука и Техника, 2004. - 336: ил.

    3. МСЭ-Т Recommendation Y.1541. Network Performance Objectives for IP-Based Services // May 2002.

    4. Chervenets V. QoS / QoE Correlation Modified Model for QoE Evaluation on Video Service / V. Chervenets, V. Romanchuk, H. Beshley, A.Khudyy // Modern problems of radio engineering, telecommunications and computer science Proceedings of the ХIIИ th International Conference TCSET'2016

    5. Romanchuk V. Research of Multimedia Streaming Transmission in Multiservice Networks / V. Romanchuk, V. Chervenets, A.Polishuk // Modernproblems of radio engineering, telecommunications and computer science Proceedings of the ХИ th International Conference TCSET'2012

    6. Романчук В. Реализация QoS для мультимедийного трафика в корпоративной сети / В.И. Романчук, В.В. Червенець. // Материалы НМК -Современные проблемы телекоммуникаций и подготовка специалистов в области телекоммуникаций - 2011

    7. Чернихивский Е.М. Исследование механизмов (QoE) в телекоммуникационных сетях / Е.М. Чернихивский, В.В. Червенець, А.В. Полищук // Материалы НПК -Современные проблемы телекоммуникаций