Konstantin Samouylov

Konstantin Samouylov
Peoples' Friendship University of Russia | rudn · Department of Telecommunication Systems

Professor

About

263
Publications
43,347
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2,079
Citations
Citations since 2017
190 Research Items
1787 Citations
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20172018201920202021202220230100200300

Publications

Publications (263)
Article
Full-text available
Sub-terahertz (sub-THz, 100-300 GHz) communications promise to bring extraordinary rates in future 6G systems. High path loss and blockage effects will limit the coverage of base stations (BS) to a few hundred meters making deployment of such systems along the roads expensive. As a way to decrease the BS density, relaying has been proposed. However...
Article
Full-text available
The recent 3GPP initiative to extend IAB technology to mobile nodes in recently stated Release 18 opens up new opportunities for services operators in highway scenarios, where the extreme density of base stations (BS) is required to deliver uninterrupted coverage. The latter problem is specifically important for millimeter wave (mmWave) and future...
Article
Full-text available
By operating over a large bandwidth, the terahertz (THz) frequency band (0.3–3 THz) promises to deliver extremely high data rates. While the use of this band in cellular communications systems is not expected to happen within the next decade, various other use-cases such as wireless backhauling and point-to-point wireless access are on the immediat...
Article
Full-text available
Multiconnectivity is a vital option in 5G New Radio (NR) systems allowing user equipment (UE) to maintain multiple links to nearby base stations (BS) improving service reliability. However, this functionality is very power-hungry prohibiting its application in practice. To alleviate this shortcoming discontinuous reception (DRX) mechanism can be ut...
Article
Full-text available
5G New Radio (NR) systems promise to expand offered services to enable industrial automation scenarios. To enable ultra-low latency at the air interface and to exploit spatial redundancy for applications such as synchronization and motion control, user equipment (UE) will naturally require device-to-device (D2D) and base station (BS) to UE communic...
Preprint
Full-text available
5G New Radio (NR) technology operating in millimeter wave (mmWave) band is expected to be utilized in areas with high and fluctuating traffic demands such as city squares, shopping malls, etc. The latter may result in quality of service (QoS) violations. To deal with this challenge, 3GPP has recently proposed NR unlicensed (NR-U) technology that ma...
Article
Full-text available
The adoption of abundant millimeter-wave (mmWave) spectrum offers higher capacity for short-range connectivity in various Unmanned Aerial Vehicle (UAV)-centric communications scenarios. In contrast to the conventional cellular paradigm, where the coordination of connected nodes is highly centralized, the distributed deployments, such as those opera...
Chapter
Slice isolation is a key feature of the network slicing technique and refers to protecting slices from negative impact of fault, attack or workload increase in other slices. Dynamic resource slicing policies, although provide efficient multiplexing and resource utilization, may lead to situation when a traffic surge in one slice hinders performance...
Chapter
In this chapter we study some representative examples of loss systems with random resource requirements (ReLS) developed for performance analysis of 5G radio access networks and especially 5G mmWave communications. The main difference of ReLS from classical service systems is that a customer, beside a server, demands a random amount of some limited...
Chapter
This introductory chapter offers an insight into the techniques of telecommunications performance analysis discussed in the book. Section 1.1 presents a short overview of the Erlang loss formula’s evolution, from telephone trunking modeling to 5G radio access performance evaluation. In the remainder of the chapter, we study some illustrative applic...
Chapter
In this chapter, we begin by studying a ReLS model whose arrival and service rates depend on the number of customers in service. Then, we consider a ReLS in which arrivals and departures are governed by a Markov chain and obtain the necessary and sufficient conditions for the stationary distribution to have a product form. Finally, a simplified tec...
Chapter
In this chapter, we discuss the properties of generator matrices, their exponentials, and generalized inverses. We also study homogeneous and nonhomogeneous systems of linear equations with generator matrices and show how lumpability of the matrix can be used to solve the equations.
Chapter
In this chapter, we introduce Markovian arrival processes (MAPs) and their extensions. MAPs appeared when it became clear that the future methods of stochastic system modeling will be computer-based. Indeed, MAPs are specified by several matrices, which makes them convenient to use when analyzing stochastic systems by matrix-analytical methods. At...
Chapter
This chapter deals with two fundamental models in queueing/teletraffic theory—Erlang’s loss and delay systems. We discuss the Equivalent Random Traffic (ERT) method to estimate blocking probabilities in loss systems with non-Poisson arrivals, which uses the overflow process of Erlang’s loss system to approximate the original non-Poisson arrival pro...
Article
Full-text available
Network slicing is a promising technique to enable multi-tenant operation in fifth generation (5G) cellular systems. However, efficient implementation of this technique at the air interface requires an adequate resource allocation policy that provides slice isolation and takes into account the heterogeneity of services and their performance require...
Article
Full-text available
Unmanned aerial vehicles (UAV) are envisioned to become one of the new types of fifth/sixth generation (5G/6G) network users. To support advanced services for UAVs such as video monitoring, one of the prospective options is to utilize recently standardized New Radio (NR) technology operating in the millimeter-wave (mmWave) frequency band. However,...
Article
Full-text available
Recently standardized New Radio (NR) technology supports both ultra-reliable low-latency (URLLC) service and conventional enhanced mobile broadband (eMBB) service. Owing to extreme latency and reliability requirements an explicit prioritization needs to be provided to URLLC service when these traffic types are mixed up at the air interface. In this...
Article
Full-text available
Millimeter wave (mmWave) and terahertz (THz)radio access technologies (RAT) are expected to become a critical part of the future cellular ecosystem providing an abundant amount of bandwidth in areas with high traffic demands. However, extremely directional antenna radiation patterns that need to be utilized at both transmit and receive sides of a l...
Article
Full-text available
5G New Radio (NR) technology operating in millimeter wave (mmWave) band is expected to be utilized in areas with high and fluctuating traffic demands such as city squares, shopping malls, etc. The latter may result in quality of service (QoS) violations. To deal with this challenge, 3GPP has recently proposed NR unlicensed (NR-U) technology that ma...
Article
Full-text available
The support of multicast communications in the fifth-generation (5G) New Radio (NR) system poses unique challenges to system designers. Particularly, the highly directional antennas do not allow to serve all the user equipment devices (UEs) that belong to the same multicast session in a single transmission. However, the capability of modern antenna...
Article
Full-text available
Efficient allocation of radio access network (RAN) resources remains an important challenge with the introduction of 5G networks. RAN virtualization and division into logical subnetworks - slices - puts this task into a new perspective. In the paper we present a software tool based on the OMNeT++ platform and developed for performance analysis of a...
Article
Full-text available
The article deals with queueing systems with random resource requirements modeled as bivariate Markov jump processes. One of the process components describes the service system with limited resources. Another component represents a random environment that submits multi-class requests for resources to the service system. If the resource request is l...
Article
Full-text available
Terahertz (THz) communications systems are expected to become a major enabling technology at the air interface in sixth-generation (6G) cellular systems. However, utilizing extremely narrow antenna radiation patterns at both base station (BS) and user equipment (UE) sides, these systems are affected by not only dynamic blockage but micromobility of...
Article
Full-text available
This article is a continuation of a number of works devoted to evaluation of probabilistic-temporal characteristics of firewalls when ranging a filtration rule set. This work considers a problem of the decrease in the information flow filtering efficiency. The problem emerged due to the use of a sequential scheme for checking the compliance of pack...
Article
Full-text available
Firewalls is one of the major components to provide network security. By using firewalls, you can solve such problems as preventing unauthorized access, and deleting, modifying and/or distributing information under protection. The process of information flows filtration by a firewall introduces additional time delays, thus possibly leading to disru...
Article
Full-text available
The emerging 5G New Radio (NR) cellular systems that may operate in millimeter-wave (mmWave) frequency bands are expected to offer larger bandwidths. They are to be deployed in densely crowded environments, where the traffic load has a high degree of variability, which may introduce capacity bottlenecks. One of the options to alleviate the latter i...
Preprint
Full-text available
Millimeter wave (mmWave) and terahertz (THz) radio access technologies (RAT) are expected to become a critical part of the future cellular ecosystem providing an abundant amount of bandwidth in areas with high traffic demands. However, extremely directional antenna radiation patterns that need to be utilized at both transmit and receive sides of a...
Article
Full-text available
A novel multi-server vacation queuing model is considered. The distinguishing feature of the model, compared to the standard queues, is the self-sufficiency of servers. A server can terminate service and go on vacation independently of the system manager and the overall situation in the system. The system manager can make decisions whether to allow...
Article
Recently, a great development has occurred in the communication networks, in which the trend of development is towards automation and flexible network structure. In addition, the stages of telecommunication development are conventionally divided from manual switching to flexible virtualized architecture, to which telecommunications operators have r...
Article
Full-text available
In order to fulfill the stringent Ultra-Reliable Low Latency Communication (URLLC) requirements towards Fifth Generation (5G) mobile networks, early-Hybrid Automatic Repeat reQuest (e-HARQ) schemes have been introduced, aimed at providing faster feedback and thus earlier retransmission. The performance of e-HARQ prediction strongly depends on the c...
Article
Fifth generation millimeter wave New Radio (NR) base stations (BS) are expected to be deployed in areas with extremely high and drastically fluctuating traffic demands resulting in frequent QoS (Quality of Service) violations in terms of provided rate at the access interface, especially, during busy hour conditions. As one of the measures to combat...
Article
Full-text available
In this work, we consider a UAV-assisted cell in a single user scenario. We consider the Quality of Experience (QoE) performance metric calculating it as a function of the packet loss ratio. In order to acquire this metric, a radio-channel emulation system was developed and tested under different conditions. The system consists of two independent b...
Chapter
In this article, we introduce the concept of stochastic lists and pseudo-lists and apply them to analyze a loss system with Poisson arrivals, exponential service times, and multiple positive and negative resources. For this system, we prove that the total volumes of resources in the stochastic list and pseudo-list have the same stationary distribut...
Article
Recent multi-criteria group decision making methods focus their analysis on the experts preferences. They do not take into account the reasons why each expert has provided a specific set of preferences. In this paper, a method that introduces novel measures capable of explaining the reasons behind experts decisions is presented. A novel concept, th...
Article
Full-text available
A single-server non-pre-emptive priority queueing system of a finite capacity with many types of customers is analyzed. Inter-arrival times can be correlated and batch arrivals are allowed. Possible unreliability of the server, implying the loss of a customer or the necessity of its service from the early beginning or some phase of the service, is...
Article
In this paper we study the possibility to use the artificial neural networks for trees classification based on real and approximated values of the sap flow density flux describing water transport in trees. The data sets were generated by means of a new tree monitoring system TreeTalker©. The Fourier seriesbased model is used for fitting the data se...
Chapter
In modern infrastructure, the mobile network operator, the owner of the equipment, leases part of the resources of the base stations. Network slicing allows several virtual network operators to use the resources of one base station. This allows operators and resource owners to provide and manage multiple dedicated logical networks with specific fun...
Article
Comparing to cloud computing, fog computing performs computation and services at the edge of networks, thus relieving the computation burden of the data center and reducing the task latency of end devices. Computation latency is a crucial performance metric in fog computing, especially for real-time applications. In this paper, we study a peer comp...
Article
Full-text available
The intermittent nature of millimeter wave (mmWave) links caused by human-body blockage is an intrinsic property of the 5G New Radio (NR) technology that may cause drops of sessions already accepted for service. To improve the session continuity, multiconnectivity and guard capacity mechanisms have been proposed recently. Multiconnectivity enables...
Article
Full-text available
Blockage of millimeter-wave (mmWave) radio propagation paths in dense mobile scenarios requires advanced techniques to preserve session continuity in 5G New Radio (NR) systems. In this work, we employ the tools of stochastic geometry and queuing theory as well as rely on 3GPP cluster-based propagation modeling to formulate a mathematical framework,...
Book
Highlighting the latest advances in stochastic analysis and its applications, this volume collects carefully selected and peer-reviewed papers from the 5th International Conference on Stochastic Methods (ICSM-5), held in Moscow, Russia, November 23-27, 2020. The contributions deal with diverse topics such as stochastic analysis, stochastic methods...
Book
This book constitutes the refereed post-conference proceedings of the 24th International Conference on Distributed and Computer and Communication Networks, DCCN 2021, held in Moscow, Russia, in September 2021. The 26 revised full papers and 3 revised short papers were carefully reviewed and selected from 151 submissions. The papers cover the follow...
Chapter
In this chapter, we show how multi-class loss networks can be used to study ReLS in which the service time of a customer depends on its required resource amounts. We demonstrate that for each such loss system there exists a loss system having the same stationary distribution but whose service times are exponentially distributed and independent of r...
Chapter
In this chapter, we discuss techniques for solving equilibrium equations with block generator matrices. We study LU and UL decompositions of block generator matrices and show how they can be used to obtain solutions to equilibrium equations in matrix product and matrix-geometric form. By applying these methods to \(\left. \text{MAP} \right|\left. M...
Chapter
In this chapter, we show how matrix-geometric solutions of the equilibrium equations of finite quasi-birth-and-death processes are related to solutions of matrix quadratic equations. Necessary and sufficient conditions for the existence of solutions to the latter equations are provided and the properties of their minimal nonnegative solutions are s...
Chapter
The chapter is devoted to loss network models suitable for performance analysis of multiservice broadband networks. We discuss models of multiservice networks with unicast and multicast communications which allow for product-form stationary state distributions. The models are built step by step: first, we consider each type of communications separa...
Chapter
The chapter introduces the concepts of stochastic lists and pseudo-lists of resource allocations for modeling loss systems in which random amounts of resources of multiple types are allocated to customers for the total duration of their service times and then released. In such systems, once service is completed, a customer releases the exact amount...
Chapter
Full-text available
The development and application of smart technologies in various fields is increasing every year. Different monitoring systems and sensors generate a large amount of data sets which allows to solve various tasks on data prediction and classification. This paper deals with data sets generated by a new tree monitoring system Open image in new window...
Chapter
Internet of things (IoT) development has already become one of the main directions in the telecommunications and the information and communication system development as a whole. Promising solutions in the communication networks evolution, such as the latest LTE standards, concepts, and solutions for building 5G networks critical, include this compo...
Chapter
The possible sets of joint distribution of the word occurrence frequencies in the finite state machine input and output sequences are considered. A geometric description of such sets as convex polyhedra in a real unit cube of suitable dimension is proposed. A method has been developed for comparison of unknown and reference automata by the observed...
Chapter
We consider a class of so-called cesaro sequences over a finite alphabet, which possess the property of stability of the relative frequencies of occurrence of an arbitrary word in growing initial segments. This class includes a class of periodic sequences. A finite state automaton is called cesaro-hereditary if it processes cesaro sequences in the...
Chapter
Currently, the demand to the capacity of mobile cellular deployments dictated by modern applications is rising rapidly. This especially holds true for cases where a small area contains great number of users simultaneously like stadium or festival venue. In some of these cases stationary base station can be replaced with timely-deployed UAVs. In thi...
Conference Paper
Full-text available
We consider a binary non-autonomous shift register with a sequence of random variables connected into a simple homogeneous stationary Markov chain at the input. The expression is obtained for the probability function in the output sequence in the form of a fractional rational function, the arguments of which are the transition probabilities of the...
Conference Paper
Full-text available
The problem of recognizing the output function of a binary non-autonomous shift register is considered, the input of which receives a sequence of random variables connected in a simple homogeneous stationary Markov chain. The statistics of symbol frequencies in the output register sequence is used. The recognition problem is reduced to the form of...
Preprint
Comparing to cloud computing, fog computing performs computation and services at the edge of networks, thus relieving the computation burden of the data center and reducing the task latency of end devices. Computation latency is a crucial performance metric in fog computing, especially for real-time applications. In this paper, we study a peer comp...
Conference Paper
Full-text available
We analyse algorithmic the queueing system with two parallel queues supplied with two heterogeneous group of servers. We assume a controllable cross-connectivity of queues with certain class of customers to different groups of servers. The system is analyzed in steady state. For a given cost structure we formulate the Markov decision problem for an...
Conference Paper
Full-text available
5G millimeter wave (mmWave) New Radio (NR) base stations (BS) are expected to be deployed in areas with extremely high and drastically fluctuating traffic demands resulting in frequent quality-of-service violations in terms of the provided rate at the access interface, especially, during busy hour conditions. As a cost-efficient countermeasure we c...
Article
Full-text available
Fifth generation (5G) networks are expected to connect a huge number of Internet of Things (IoT) devices in many usage scenarios. The challenges of typical massive IoT applications with sporadic and short packet uplink transmissions are well studied, while not enough attention is given to the delivery of content of common interest, such as software...
Article
Fog computing provides computation and services to the edge of networks to support real-time applications. The latency performance is a crucial metric in fog computing. In this paper, we consider a computation offloading problem in a fog network with unknown dynamics. In this network, mobile users can offload their computational tasks to neighborho...
Article
Full-text available
Network slicing is a novel key technology in 5G networks which permits to provide a multitude of heterogeneous communication services over a common network infrastructure while satisfying strict Quality of Service (QoS) requirements. Since radio spectrum resources are inherently scarce, the slicing of the radio access network should rely on a flexi...
Article
Full-text available
A new flexible discipline for providing priority to one of two types of customers in a single-server queue is proposed. This discipline assumes the use of additional finite storages for each type of arriving customer. During the stay in a storage, a customer can leave the system or transfer to the main infinite buffer. Preference to priority custom...
Article
Full-text available
Queueing systems with random resource requirements, in which an arriving customer, in addition to a server, demands a random amount of resources from a shared resource pool, have proved useful to analyze wireless communication networks. The stationary distributions of such queuing systems are expressed in terms of truncated convolution powers of th...
Article
We present a queuing system with elastic and inelastic jobs for the analysis of the joint transmission of traffic from machine-type and broadband communications in an LTE cell. The elastic jobs arriving in the system form a Markovian Arrival Process and are serviced according to the discipline of egalitarian processor sharing on the resources alloc...
Article
Full-text available
The use of highly directional antenna radiation patterns for both the access point (AP) and the user equipment (UE) in the emerging millimeter-wave (mmWave)-based New Radio (NR) systems is inherently beneficial for unicast transmissions by providing an extension of the coverage range and eventually resulting in lower required NR AP densities. On th...
Article
Sensor fusion has attracted a lot of research attention during the few last years. Recently, a new research direction has emerged dealing with sensor fusion without knowledge of the ground truth. In this article, we present a novel solution to the latter pertinent problem. In contrast to the first reported solutions to this problem, we present a...
Article
Full-text available
We consider the joint operation of two multi-server queueing systems. Both systems provide the same type of service and compete for customers. It is assumed that the first system is controlled by ourselves while the second one is controlled by our competitor. The arriving customers are shared between the systems depending on the comparative rating...
Chapter
This chapter presents solutions for paging aimed at improving energy efficiency of different Internet of things (IoT) applications in cellular-based radio access technologies such as long-term evolution for machines and narrowband-Internet of things. The initial section describes the basic power saving solutions in licensed wireless networks and in...
Article
Full-text available
The support for reliable communication in the increasingly large fleets of autonomous vehicles is one of the important challenges for emerging 5G systems. The presence of heterogeneous data streams of different priority between the connected vehicles (coordinated autonomous driving, platooning, passenger entertainment services, etc.) calls for new...
Chapter
Full-text available
Internet of Things (IoT) technologies represent the future challenges of computing and communications. They can also be useful to improve traditional farming practices worldwide. Since the areas where agricultural land is located in remote places, there is a need for new technologies. These technologies must be suitable and reliable for communicati...
Chapter
Full-text available
The simultaneous support of enhanced mobile broadband (eMBB) and ultra-reliable low latency (URLLC) traffic types at the air interface in upcoming 5G New Radio systems is a challenging problem requiring new connection admission control and scheduling strategies. To enable this coexistence while still maintaining the prescribed quality-of-service gu...
Chapter
Full-text available
Recently, the use of air base stations located on unmanned aerial vehicles (UAVs) has attracted great attention. Static deployment of a sufficient number of UAVs allows uniform wireless coverage in the demanded areas, where the existing cellular infrastructure has white spots or insufficient capacity. However, UAVs mobility may be required for appl...
Chapter
6G/IMT-2030 is designed to provide users with innovative speeds of terabit per second, which are proposed to be achieved using a number of advanced technologies, such as Mobile Edge Computing (MEC), Internet of Things (IoT), millimeter wave (mmWave), new radio and software defined networking. It is necessary to solve several important aspects in or...
Chapter
The article has been written in continuation of a series of works on the evaluation of the probabilistic and time characteristics of firewalls while ranking a set of filtering rules. The problem under consideration is the efficiency reduction of filtering the information flows caused by: a) using a sequential circuit for verifying packet compliance...
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