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Journal articles on the topic 'Queuing theory. Telecommunication'
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Afolalu, S. A., O. M. Ikumapayi, A. Abdulkareem, M. E. Emetere, and O. Adejumo. "A short review on queuing theory as a deterministic tool in sustainable telecommunication system." Materials Today: Proceedings 44 (2021): 2884–88. http://dx.doi.org/10.1016/j.matpr.2021.01.092.
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Иванов, А. Ю., В. И. Комашинский, and А. Н. Соколов. "Mathematical modeling of the characteristics of the quality of service of messages in the information and telecommunication network of water transport." MORSKIE INTELLEKTUAL`NYE TEHNOLOGII), no. 2(52) (June 5, 2021): 92–97. http://dx.doi.org/10.37220/mit.2021.52.2.014.
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Внедрение интеллектуальных транспортных систем позволяет перейти на качественно новый уровень решения транспортно-логистических задач произвольного масштаба. Интеллектуализация основана на широком использовании информационно-телекоммуникационных сетей и систем, ориентированных на реализацию передовых и перспективных информационных технологий. В этом аспекте проявляется актуальность и важность построения коммуникационной среды, обеспечивающей передачу разнородного контента с требуемым уровнем качества. Материал статьи сосредоточен на разработке математического аппарата в рамках теории массового обслуживания с целью прогностического анализа характеристик качества обслуживания сообщений в информационно-телекоммуникационной сети водного транспорта. Осуществлена постановка задачи нахождения значений показателей качества обслуживания пакетов данных в сети. Обоснованы и получены основные математические соотношения. Оценена корректность разработанного математического инструментария. Показана возможность решения как прямых, так и обратных задач исследования информационно-телекоммуникационных систем в приведенной постановке. На этом основании сформулированы рекомендации по практическому применению результатов, полученных в статье. The introduction of intelligent transport systems allows you to move to a qualitatively new level of solving transport and logistics problems of any scale. Intellectualization is based on the widespread use of information and telecommunication networks and systems focused on the implementation of advanced and promising information technologies. This aspect demonstrates the relevance and importance of building a communication environment that ensures the transfer of heterogeneous content with the required level of quality. The material of the article is focused on the development of a mathematical apparatus within the framework of the queuing theory for the purpose of predictive analysis of the characteristics of the quality of service of messages in the information and telecommunication network of water transport. The formulation of the problem of finding the values of quality indicators of service of data packets in the network is carried out Basic mathematical relations are substantiated and obtained. The correctness of the developed mathematical tools is assessed. The possibility of solving both direct and inverse problems of researching information and telecommunication systems in the given formulation is shown. On this basis, recommendations were formulated for the practical application of the results obtained in the article.
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Ammar, Sherif I., Tao Jiang, and Qingqing Ye. "Transient analysis of impatient customers in an M/M/1 disasters queue in random environment." Engineering Computations 37, no. 6 (February 10, 2020): 1945–65. http://dx.doi.org/10.1108/ec-06-2019-0274.
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Purpose This paper aims to consider a single server queue with system disasters and impatience behavior are evident in our daily life. For this purpose, authors require to know the general behavior of these systems. Transient analysis shows for us how the system will operate up to some time instant t. Design/methodology/approach In this paper, authors consider a single server queue with system disaster and impatient behavior of customers in a multi-phase random environment, in which the system transits to a repair state after each system disaster. When the system is in a failure phase or going through a repair phase, the new arrivals would be impatient. In case the system is not repaired before the customer’s time expires, the customer would leave the queue and never return. Moreover, after repair, the system becomes ready for service in an operative phase with probability $q_{i} \ge 0.$. Using generating functions along with continued fractions and some properties of the confluent hypergeometric function, authors obtained on their own results. Findings Explicit expressions have been obtained for the time-dependent probabilities of the underlying queuing model. Also, time-dependent mean and variance of customers in the system are deduced. Research limitations/implications The system authors are dealing with is somewhat complicated, there are some performance measures that cannot be achieved, but some of them have been obtained, such as the expectation and variance of the number of customers in the system. Practical implications Based on the obtained results, some numerical examples are some numerical examples are presented to illustrate the effect of various parameters on the behavior of the proposed system. Social implications Authors’ studied transient analysis of a single server queue with system disaster and impatient customer system is suitable for behavior interpretation of many systems in our lives, such as telecommunication networks, inventory systems and impatient telephone switchboard customers, manufacturing system and service system. Originality/value To the best of the author’s/authors’ knowledge and according to the literature survey, in a multi-phase random environment, no previous published article is presented for transient analysis of a single server queue with system disaster and impatient customer behavior in a random environment.
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Mubarak, Rio, Setiyo Budiyanto, Putri Wulandari, Fajar Rahayu, Andi Adriansyah, and Mudrik Alaydrus. "A queue theory in the cross-polarization of antenna in satellite communication." Indonesian Journal of Electrical Engineering and Computer Science 22, no. 2 (May 1, 2021): 884. http://dx.doi.org/10.11591/ijeecs.v22.i2.pp884-892.
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<span>Satellite communication is a telecommunications technique that uses satellites as a connecting component, for example VSAT. In antenna installation, there is an important process which is called the cross-polarization. Cross-polarization is one process that cannot be released inside installation of VSAT antennas for satellite communication. Sometimes, in this process, a user queue will occur. Queuing theory explain the process is done and also calculate the other factors that are in the process. By knowing queuing theory to the cross-polarization, it will be easy to know the efficiency of queuing theory in the cross-polarization. Based on the characteristics of the cross-polarization, user can be known the queuing model that used and performance of the queuing system. The queuing model for the cross-polarization, using Kendall notation, M/M/1. Based on the analysis that has been done; by using 1 server the value of service level (ρ) is 0.67, using 2 servers = 0.33 and 3 servers = 0.22. The waiting time in the queue is longer if using 1 server which is 0.67 hours or 40 minutes. If a satellite operator uses 2 servers, waiting time in the queue is 25 minutes and 3 servers is 2.8 minutes which means that there is almost no waiting time in the queue.</span>
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Papir, Z. "Queueing Theory with Applications to Packet Telecommunications [Book Review." IEEE Communications Magazine 44, no. 5 (May 2006): 14–16. http://dx.doi.org/10.1109/mcom.2006.1637937.
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Le Gall, Pierre. "The theory of networks of single server queues and the tandem queue model." Journal of Applied Mathematics and Stochastic Analysis 10, no. 4 (January 1, 1997): 363–81. http://dx.doi.org/10.1155/s1048953397000427.
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We consider the stochastic behavior of networks of single server queues when successive service times of a given customer are highly correlated. The study is conducted in two particular cases: 1) networks in heavy traffic, and 2) networks in which all successive service times have the same value (for a given customer), in order to avoid the possibility of breaking up the busy periods. We then show how the local queueing delay (for an arbitrary customer) can be derived through an equivalent tandem queue on the condition that one other local queueing delay is added: the jitter delay due to the independence of partial traffic streams.We consider a practical application of the results by investigating the influence of long packets on the queueing delay of short packets in modern packet switched telecommunication networks. We compare these results with the results given by traffic simulation methods to conclude that there is good agreement between results of calculation and of traffic simulation.
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Klimenok, Valentina, Alexander Dudin, and Vladimir Vishnevsky. "Priority Multi-Server Queueing System with Heterogeneous Customers." Mathematics 8, no. 9 (September 4, 2020): 1501. http://dx.doi.org/10.3390/math8091501.
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In this paper, we analyze a multi-server queueing system with heterogeneous customers that arrive according to a marked Markovian arrival process. Customers of two types differ in priorities and parameters of phase type distribution of their service time. The queue under consideration can be used to model the processes of information transmission in telecommunication networks in which often the flow of information is the superposition of several types of flows with correlation of inter-arrival times within each flow and cross-correlation. We define the process of information transmission as the multi-dimensional Markov chain, derive the generator of this chain and compute its stationary distribution. Expressions for computation of various performance measures of the system, including the probabilities of loss of customers of different types, are presented. Output flow from the system is characterized. The presented numerical results confirm the high importance of account of correlation in the arrival process. The values of important performance measures for the systems with the correlated arrival process are essentially different from the corresponding values for the systems with the stationary Poisson arrival process. Measurements in many real world systems show poor approximation of real flows by such an arrival process. However, this process is still popular among the telecommunication engineers due to the evident existing gap between the needs of adequately modeling the real life systems and the current state of the theory of algorithmic methods of queueing theory.
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Tarasov, V. N., and N. F. Bakhareva. "DELAY MODELS BASED ON SYSTEMS WITH USUAL AND SHIFTED HYPEREXPONENTIAL AND HYPERERLANGIAN INPUT DISTRIBUTIONS." Radio Electronics, Computer Science, Control, no. 2 (June 26, 2021): 56–64. http://dx.doi.org/10.15588/1607-3274-2021-2-6.
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Context. In the queueing theory, the study of systems with arbitrary laws of the input flow distribution and service time is relevant because it is impossible to obtain solutions for the waiting time in the final form for the general case. Therefore, the study of such systems for particular cases of input distributions is important.
Objective. Getting a solution for the average delay in the queue in a closed form for queuing systems with ordinary and with shifted to the right from the zero point hyperexponential and hypererlangian distributions in stationary mode.
Method. To solve this problem, we used the classical method of spectral decomposition of the solution of the Lindley integral equation. This method allows to obtaining a solution for the average delay for two systems under consideration in a closed form. The method of spectral decomposition of the solution of the Lindley integral equation plays an important role in the theory of systems G/G/1. For the practical application of the results obtained, the well-known method of moments of probability theory is used.
Results. For the first time, a spectral decomposition of the solution of the Lindley integral equation for systems with ordinary and with shifted hyperexponential and hyperelangian distributions is obtained, which is used to derive a formula for the average delay in a queue in closed form.
Conclusions. It is proved that the spectral expansions of the solution of the Lindley integral equation for the systems under consideration coincide; therefore, the formulas for the mean delay will also coincide. It is shown that in systems with a delay, the average delay is less than in conventional systems. The obtained expression for the waiting time expands and complements the wellknown incomplete formula of queuing theory for the average delay for systems with arbitrary laws of the input flow distribution and service time. This approach allows us to calculate the average delay for these systems in mathematical packages for a wide range of traffic parameters. In addition to the average waiting time, such an approach makes it possible to determine also moments of higher orders of waiting time. Given the fact that the packet delay variation (jitter) in telecommunications is defined as the spread of the waiting time from its average value, the jitter can be determined through the variance of the waiting time.
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Tarasov, V. N. "Queuing Systems with a Time Lag." INFORMACIONNYE TEHNOLOGII 27, no. 6 (June 9, 2021): 291–98. http://dx.doi.org/10.17587/it.27.291-298.
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The article discusses various queuing systems (QS) formed by four laws of probability distributions: exponential, hyperexponential, Erlang and hyper-Erlang of the second order. These four laws form sixteen different QS. In contrast to the classical theory, this article considers QS with distribution laws shifted to the right from the zero point. Such QS are of type G/G/1 with arbitrary laws of the distribution of intervals between the requirements of the input flow and the service time. As you know, for such systems it is impossible to obtain solutions for the main characteristic of QS the average waiting time in the general case. Therefore, studies of such systems are important for special cases of distribution laws. The article provides an overview of the author's results for the average waiting time in a queue in a closed form for systems with input distributions shifted to the right from the zero point. To solve this problem, the spectral decomposition method for solving the Lindley integral equation was used. In the course of solving the problem, spectral decompositions of the solution of the Lindley integral equation for eight systems were obtained and with their help calculation formulas were derived for the average waiting time in the queue. It is shown that in systems with delay, the average waiting time is shorter than in conventional systems. The obtained calculation formulas for the average waiting time expand and complement the well-known incomplete formula of the queuing theory for the average waiting time for G/G/1 systems. The proposed approach allows us to calculate the average value and moments of higher orders of waiting time for these systems in mathematical packages for a wide range of changes in traffic parameters. Given the fact that the variation in packet delay (jitter) in the telecommunications standard is defined as the spread of waiting time around its average value, the jitter can be determined through the variance of the waiting time.
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Brezavšček, Alenka, and Alenka Baggia. "Optimization of a Call Centre Performance Using the Stochastic Queueing Models." Business Systems Research Journal 5, no. 3 (September 1, 2014): 6–18. http://dx.doi.org/10.2478/bsrj-2014-0016.
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Abstract Background A call centre usually represents the first contact of a customer with a given company. Therefore, the quality of its service is of key importance. An essential factor of the call centre optimization is the determination of the proper number of operators considering the selected performance measure. Results of previous research show that this can be done using the queueing theory approach. Objectives: The paper presents the practical application of the stochastic queueing models aimed at optimizing a Slovenian telecommunication provider’s call centre. Methods/Approach: The arrival and the service patterns were analysed, and it was concluded that the call centre under consideration can be described using the M/M/r {infinity/infinity/FIFO} queueing model. Results: An appropriate number of operators were determined for different peak periods of the working day, taking into consideration the following four performance measures: the expected waiting time, the expected number of waiting customers, the probability that a calling customer will have to wait, and the call centre service level. Conclusions: The obtained results prove the usefulness and applicability of the queueing models as a tool for a call centre performance optimization. In practice, all the data needed for such a mathematical analysis are usually provided. This paper is aimed at illustrating how such data can be efficiently exploited.
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Tarasov, V. N. "MATHEMATICAL DELAY MODEL BASED ON SYSTEMS WITH HYPERERLANGIAN AND ERLANGIAN DISTRIBUTIONS." Radio Electronics, Computer Science, Control 1, no. 1 (March 27, 2021): 87–96. http://dx.doi.org/10.15588/1607-3274-2021-1-9.
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Context. Studies of G/G/1 systems in queuing theory are relevant because such systems are of interest for analyzing the delay of data transmission systems. At the same time, it is impossible to obtain solutions for the delay in the final form in the general case for arbitrary laws of distribution of the input flow and service time. Therefore, it is important to study such systems for particular cases of input distributions. We consider the problem of deriving a solution for the average queue delay in a closed form for two systems with ordinary and shifted hypererlangian and erlangian input distributions.
Objective. Obtaining a solution for the main characteristic of the system – the average delay of requests in the queue for two queuing systems of the G/G/1 type with ordinary and with shifted hypererlangian and erlangian input distributions.
Method. To solve this problem, we used the classical method of spectral decomposition of the solution of the Lindley integral equation. This method allows to obtaining a solution for the average delay for systems under consideration in a closed form. The method of spectral decomposition of the solution of the Lindley integral equation plays an important role in the theory of systems G/G/1. For the practical application of the results obtained, the well-known method of moments of probability theory is used.
Results. For the first time, spectral expansions of the solution of the integral Lindley equation for two systems are obtained, with the help of which calculation formulas for the average delay in a queue in a closed form are derived. Thus, mathematical models of queuing delay for these systems have been built.
Conclusions. These formulas expand and supplement the known queuing theory formulas for the average delay G/G/1 systems with arbitrary laws distributions of input flow and service time. This approach allows us to calculate the average delay for these systems in mathematical packages for a wide range of traffic parameters. In addition to the average delay, such an approach makes it possible to determine also moments of higher orders of waiting time. Given the fact that the packet delay variation (jitter) in telecommunications is defined as the spread of the delay from its average value, the jitter can be determined through the variance of the delay.
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Mochalov, Valery P., Gennady I. Linets, Natalya Yu Bratchenko, and Svetlana V. Govorova. "An Analytical Model of a Corporate Software-Controlled Network Switch." Scalable Computing: Practice and Experience 21, no. 2 (June 27, 2020): 337–46. http://dx.doi.org/10.12694/scpe.v21i2.1698.
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Implementing the almost limitless possibilities of a software-defined network requires additional study of its infrastructure level and assessment of the telecommunications aspect. The aim of this study is to develop an analytical model for analyzing the main quality indicators of modern network switches. Based on the general theory of queuing systems and networks, generated functions and Laplace-Stieltjes transforms, a three-phase model of a network switch was developed. Given that, in this case, the relationship between processing steps is not significant, quality indicators were obtained by taking into account the parameters of single-phase networks. This research identified the dependencies of service latency and service time of incoming network packets on load, as well as equations for finding the volume of a switch’s buffer memory with an acceptable probability for message loss.
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Grace, Adam W., Dirk P. Kroese, and Werner Sandmann. "Automated State-Dependent Importance Sampling for Markov Jump Processes via Sampling from the Zero-Variance Distribution." Journal of Applied Probability 51, no. 03 (September 2014): 741–55. http://dx.doi.org/10.1017/s0021900200011645.
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Many complex systems can be modeled via Markov jump processes. Applications include chemical reactions, population dynamics, and telecommunication networks. Rare-event estimation for such models can be difficult and is often computationally expensive, because typically many (or very long) paths of the Markov jump process need to be simulated in order to observe the rare event. We present a state-dependent importance sampling approach to this problem that is adaptive and uses Markov chain Monte Carlo to sample from the zero-variance importance sampling distribution. The method is applicable to a wide range of Markov jump processes and achieves high accuracy, while requiring only a small sample to obtain the importance parameters. We demonstrate its efficiency through benchmark examples in queueing theory and stochastic chemical kinetics.
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Grace, Adam W., Dirk P. Kroese, and Werner Sandmann. "Automated State-Dependent Importance Sampling for Markov Jump Processes via Sampling from the Zero-Variance Distribution." Journal of Applied Probability 51, no. 3 (September 2014): 741–55. http://dx.doi.org/10.1239/jap/1409932671.
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Many complex systems can be modeled via Markov jump processes. Applications include chemical reactions, population dynamics, and telecommunication networks. Rare-event estimation for such models can be difficult and is often computationally expensive, because typically many (or very long) paths of the Markov jump process need to be simulated in order to observe the rare event. We present a state-dependent importance sampling approach to this problem that is adaptive and uses Markov chain Monte Carlo to sample from the zero-variance importance sampling distribution. The method is applicable to a wide range of Markov jump processes and achieves high accuracy, while requiring only a small sample to obtain the importance parameters. We demonstrate its efficiency through benchmark examples in queueing theory and stochastic chemical kinetics.
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Kravets, Oleg Jakovlevich, Elena Ivanovna Danilina, Iana Ivanovna Malikova, and Dmitry Vladimirovich Gorelov. "Monitoring optimization of telecommunication networks for generation of reserve capacity in system." Nexo Revista Científica 34, no. 02 (June 9, 2021): 993–1007. http://dx.doi.org/10.5377/nexo.v34i02.11625.
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This article discusses an approach to monitoring optimization in telecommunication networks with packet routing. Mathematical model of data networking with accounting for monitoring traffic structure is described, optimization task is determined. Main attention is paid to model development on the basis of queueing theory in order to generation of reserve capacity in system. The main concept is that comparatively simple structure of monitoring network is imposed on physical structure of telecommunication network. The modeling is aimed at selection of optimum parameters of monitoring system, solution techniques for similar task are proposed. The obtained optimization task is sufficiently complicated, subsequent attempts should be aimed at searching for conditions which would enable introduction of some constraints in order to simplify its solution without noticeable loss of the model adequacy. This is especially important for asynchronous task of monitoring, it should be based on selection of the most acceptable type of objective function (linear or quadratic). Management system structure of terminal equipment monitoring has been developed for railway sector on the basis of SNMP V3. The system would permit to improve confidence level of data received from measuring system about electrical parameters of route cables, thus decreasing human errors upon classification of emergency situations occurring in communication networks.
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Maharramov, Zakir, Vugar Abdullayev, and Tamilla Mammadova. "MODELLING SELF-SIMILAR TRAFFIC OF MULTISERVICE NETWORKS." EUREKA: Physics and Engineering 1 (January 31, 2019): 46–54. http://dx.doi.org/10.21303/2461-4262.2019.00841.
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Simulation modelling is carried out, which allows adequate describing the traffic of multiservice networks with the commutation of packets with the characteristic of burstiness. One of the most effective methods for studying the traffic of telecommunications systems is computer simulation modelling. By using the theory of queuing systems (QS), computer simulation modelling of packet flows (traffic) in modern multi-service networks is performed as a random self-similar process. Distribution laws such as exponential, Poisson and normal-logarithmic distributions, Pareto and Weibull distributions have been considered. The distribution of time intervals between arrivals of packages and the service duration of service of packages at different system loads has been studied. The research results show that the distribution function of time intervals between packet arrivals and the service duration of packages is in good agreement with the Pareto and Weibull distributions, but in most cases the Pareto distribution prevails. The queuing systems with the queues M/Pa/1 and Pa/M/1 has been studied, and the fractality of the intervals of requests arriving have been compared by the properties of the estimates of the system load and the service duration. It has been found out that in the system Pa/M/1, with the parameter of the form a> 2, the fractality of the intervals of requests arriving does not affect the average waiting time and load factor. However, when 𝑎≤2, as in the M/Pa/1 system, both considered statistical estimates differ. The application of adequate mathematical models of traffic allows to correctly assess the characteristics of the quality of service (QoS) of the network.
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Shyshatskyi, A., O. Sova, Yu Zhuravskyi, O. Nalapko, Yu Sokil, and Yu Ryndin. "ANALYSIS OF APPROACHES OF INFLUENCE OF ELECTRONIC WARFARE MEANS ON THE ON THE NETWORK-CENTRIC CONTROL SYSTEM." Системи управління, навігації та зв’язку. Збірник наукових праць 6, no. 58 (December 28, 2019): 129–39. http://dx.doi.org/10.26906/sunz.2019.6.129.
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The intensive development of information and control technologies, as well as their integration into a single information space, leads to an increase in the role of such technologies in the processes of control of troops (forces) and weapons, including high-precision ones. At the same time, the electronic material base of the information infrastructure created within the concept of network-centric warfare is potentially vulnerable to electronic warfare. In this article, the authors analyze the approaches to the influence of electronic warfare on network-centric control systems. In the course of the study, the authors solved the following interrelated tasks: identified information restrictions on the implementation of the network-centric war concept; the prospects for the development of electronic warfare systems that are focused on disruption of the operation of network-centric systems of military control and the prospective scientific and methodological approaches to substantiate the methods of radio-electronic influence on network-centric control systems. In the course of this research, the authors used the basic principles of electronic warfare theory, signal theory, communication theory, queuing systems and classical methods of scientific cognition - analysis and synthesis. According to the results of the study, the following conclusions can be drawn: perspective directions for the development of radio-electronic influences, oriented on the transport layer of communication networks, can be implemented as complexes of territorially distributed means of electronic control, implementing fundamentally new methods of suppression, and special software and bookmarks software (viruses) that are introduced into the telecommunications network equipment. It should be noted that the use of all the above radio-electronic effects is advisable only against packet networks with advanced topology. The use of such influences against networks with tree topology is pointless given the possibility of attaining the suppression effect of “classical” channel suppression
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Yula, O., O. Bidnyi, A. Vakula, O. Petrov, and O. Kravchuk. "ANALYSIS OF APPROACHES OF IMPACT OF ELECTRONIC WARFARE MEANS ON THE NETWORK–CENTRIC CONTROL SYSTEM." Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки, no. 7 (May 21, 2021): 101–14. http://dx.doi.org/10.37701/dndivsovt.7.2021.12.
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The intensive development of information and control technologies, as well as their integration into a single information space, leads to an increase in the role of such technologies in the processes of control of troops (forces) and weapons, including high-precision ones. At the same time, the electronic material base of the information infrastructure created within the concept of network-centric warfare is potentially vulnerable to electronic warfare.
In this article, the authors analyze the approaches to the impact of electronic warfare on network-centric control systems. In the course of the study, the authors solved the following interrelated tasks: identified information restrictions on the implementation of the network-centric war concept; the prospects for the development of electronic warfare systems that are focused on disruption of the operation of network-centric systems of military control and the prospective scientific and methodological approaches to substantiate the methods of radio-electronic impact on network-centric control systems.
In the course of this research, the authors used the basic principles of electronic warfare theory, signal theory, communication theory, queuing systems and classical methods of scientific cognition – analysis and synthesis. According to the results of the study, the following conclusions can be drawn: perspective directions for the development of radio-electronic impact, oriented on the transport layer of communication networks, can be implemented as complexes of territorially distributed means of electronic control, implementing fundamentally new methods of suppression, and special software and bookmarks software (viruses) that are introduced into the telecommunications network equipment.
It should be noted that the use of all the above radio-electronic effects is advisable only against packet networks with advanced topology. The use of such impacts against networks with tree topology is pointless since there is a possibility of attaining the suppression effect by“classical” channel suppression.
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Ibrahimov, Bayram G., Mehman F. Binnatov, and Yalchin S. Isayev. "THE INVESTIGATION AND EVALUATION MULTISERVICE NETWORK NGN/IMS FOR MULTIMEDIA TRAFFIC." SYNCHROINFO JOURNAL 6, no. 3 (2020): 10–13. http://dx.doi.org/10.36724/2664-066x-2020-6-2-10-13.
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The subject of the study is multiservice communication network using the concept NGN (Next Generation Network) based on the open network architecture IMS (Internet Protocol Multimedia Subsystem), supporting a wide range services. The basis of this architecture is the IMS core, consisting of a set of specialized modules responsible for various functions for customer service. The purpose of the article is to analyze the existing technical capabilities of the IMS multimedia messaging subsystem and perspective solutions for the functioning of the NGN/IMS network efficiency in providing multimedia service. As the efficiency of the system, the capacity NGN/IMS networks is selected using the signaling system and protocols NGN. The capacity NGN/IMS networks during the establishment of a multimedia session was analyzed and the functional architecture of the IMS multimedia messaging subsystem that determine the interaction NGN signaling systems an protocols was explored. Manage the presentation Triple Play services to subscribers and simultaneously modify the media stream within the session allows the protocol for the initialization of the SIP and Diameter sessions, which are the main IMS signaling protocol. One of the important requirements for the IMS subsystem is the maintenance QoS (Quality of Service). A mathematical model for estimating the quality of communication services using a system GI/G/1/N based on the theory diffusion approximation is proposed. The research presented in this paper is very important for the theory queuing systems, since the article proposes a method for investigating multiservice communication networks with non-Poisson incoming flow and effective results are obtained for NGN/IMS networks. On the basis of the model analytical expressions are obtained, which allow evaluating the performance indicators of the Triple Play service. The proposed mathematical model can be used to solve a wide range of practical problems, including the management multiservice traffic in the process its transmission in multiservice telecommunications networks, taking into account the quality of service classes. Thus, studies NGN/IMS network capacity indicators using SIP protocols are relevant.
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Dalalah, Doraid. "Benchmarking of Six Sigma in telecom services." Benchmarking: An International Journal 26, no. 6 (August 5, 2019): 1799–822. http://dx.doi.org/10.1108/bij-07-2017-0190.
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Purpose The purpose of this paper is to assess and benchmark Six Sigma strategies in services sector, namely, the telecom field, by establishing tables of fallouts of non-conforming services and their associated costs along with a custom data envelopment model for benchmarking the different strategic alternatives. Design/methodology/approach Under normality assumption, process fallout in Six Sigma is around 0.002/3.4 part per million for a centered/shifted process. By introducing Six Sigma to applications in services sector, normality assumption may no longer be valid; hence, fallouts of non-normal attributes are computed for different one-sided quality levels. The associated costs of strategy deployment, fallout and transaction completion are all considered. Data envelopment analysis model is also established to benchmark the Six Sigma strategic plans. The strategies are detailed down to processes and to quality characteristics which constitute the decision-making units. The efficiency of each service unit is computed using both CCR and super efficiency models. Findings The amount of efforts/costs needed to reduce the variation in a service may differ according to the targeted quality level. For the same Six Sigma quality level, services demonstrate different performance/efficiencies and hence different returns. In some scenarios, moderate quality levels could present high efficiencies as compared to services of higher levels. It was also found that the required improvement is less in the case of Log-normal as compared to normal distributions at some quality levels. This observation is also noted across the presented distributions of this study (Normal, Log-normal, Exponential, Gamma and Weibull). Social implications The deployment of Six Sigma in services is mostly found in time-related concepts such as timeliness of billing, lifetimes in reliability engineering, queueing theory, healthcare and telecommunication. Originality/value The paper contributes to the existing research by presenting an assessment model of Six Sigma strategies in services of non-normal distributions. Strategies of different quality levels present diverse efficiencies; hence, higher quality levels may not be the best alternatives in terms of the returns on investment. The computed fallout rates of the different distributions can serve as palm lines for further deployment of Six Sigma in services. Besides, the combination of optimization and Six Sigma analysis provides additional benchmarking tool of strategic plans in both manufacturing and services sector.
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"Queueing theory for telecommunications." Choice Reviews Online 29, no. 08 (April 1, 1992): 29–4562. http://dx.doi.org/10.5860/choice.29-4562.
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Kniazievа, Nina, and Serhii Shestopalov. "EVALUATION OF SERVICES QUALITY IN IMS." Visnyk Universytetu “Ukraina”, 2019. http://dx.doi.org/10.36994/2707-4110-2019-1-22-22.
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The main stages of the historical development of telecommunication networks are shown. It is noted that today the most common concepts are NGN (Next Generation Network), supporting the functionality of Triple-Play Services (triple services – voice, video and data transmission), as well as IMS (IP Multimedia Subsystem), which combines cellular technology and landline communications. They are able to provide a wide range of services: basic, additional, intelligent. In addition, IMS is able to provide mobile services. The IMS architecture layers are presented – transport layer, control layer; layer of service and application servers. Particular attention is paid to the layer of service and application servers. Based on the analysis of ITU recommendations, the main telecommunication services quality indexes are determined, namely, the time of service provision, the length of the queue that the service request falls into to wait for service on the server, and the probability of refusing to provide services. Based on the proposed mathematical models of the NGN intelligent superstructure, analytical expressions are presented for calculating the quality indexes of intelligent services in NGN for one type of service and for K types of services, taking into account the self-similarity of traffic, and without taking into account. To evaluate the quality of services in IMS, it is proposed to use the approaches of queuing theory and tensor analysis. Tensor analysis offers a mathematical apparatus for transforming coordinate systems, considering IMS as a set of geometric objects whose projections are different in different coordinate systems, but the physical properties of the objects themselves do not change. Expressions are proposed that make it possible to calculate the following QoS indexes in IMS: average queue length, average residence time of an application in the system for all types of services in IMS. It is considered that the incoming traffic is the simplest. Further development of the work is to take into account the self-similar nature of traffic, which is created by the flow of requests for services that come to IMS, as well as the limitations of the server buffer, which will allow a more accurate assessment of the quality of services in IMS.