Papers by Konstantin Samouylov
Telecommunication Signaling
Wiley Encyclopedia of Electrical and Electronics Engineering, 1999
Telecommunication signaling is defined as a system that enables stored program control exchanges,... more Telecommunication signaling is defined as a system that enables stored program control exchanges, network databases, and other nodes of the network to exchange messages related to call setup, call termination, supervision, information needed for distributed ...
Group-based delivery of critical traffic in cellular IoT networks
Computer Networks
Mathematics
Network slicing is a novel key technology in 5G networks which permits to provide a multitude of ... more 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 flexible resource sharing policy that provides efficient resource usage, fairness and slice isolation. In this article, we propose such a policy for bandwidth-greedy communication services. The policy implies a convex programming problem and is formalized to allow for session-level stochastic modeling. We developed a multi-class service system with service rates obtained as a solution to the optimization problem, a Markovian Arrival Process and state-dependent preemptive priorities. We use matrix-analytic methods to find the steady state distribution of the resulting continuous-time Markov chain and the expressions for important performance met...
IEEE Access
The support for reliable communication in the increasingly large fleets of autonomous vehicles is... more 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 methods to estimate the performance characteristics of these systems. In this article, a novel mathematical framework is proposed to model the process of dynamic radio resource (re-)allocation across multiple competing data streams in autonomous vehicular fleets equipped with 5G cellular capabilities. The developed framework is subsequently applied to: (i) study the coexistence of multiple traffic types having different service requirements and (ii) quantify the impact of session prioritization schemes. Our study reveals that the prioritization scheme initially offloading highrate entertainment sessions, named ESpreempt, in most of the setups achieves a 5-30% performance gain in comparison with the scheme initially offloading low-rate platooning sessions, named PSpreempt. It is also shown that higher variations in the traffic load of autonomous driving sessions have a distinctly negative impact on system-level performance. The outlined framework can be applied in a wide range of 5G vehicular scenarios, as well as extended to capture other categories of data streams in future wireless networks.
Mathematics
Queueing systems with random resource requirements, in which an arriving customer, in addition to... more 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 the cumulative distribution function of the resource requirements. Discretization of the cumulative distribution function and the application of the fast Fourier transform are a traditional way of calculating convolutions. We suggest finding truncated convolution powers of the cumulative distribution functions by calculating the convolution powers of the truncated cumulative distribution functions via fast Fourier transform. This radically decreases computational complexity. We introduce the concept of resource load and investigate the accuracy of the proposed method at low and high resource loads. It is shown that the proposed method makes ...
Characterizing Resource Allocation Trade-offs in 5G NR Serving Multicast and Unicast Traffic
IEEE Transactions on Wireless Communications
IEEE Transactions on Cybernetics
Sensor fusion has attracted a lot of research atten tion during the last years. Recently, a new r... more Sensor fusion has attracted a lot of research atten tion during the last years. Recently, a new research direction has emerged dealing with sensor fusion without knowledge of the ground truth. In this paper, we present a novel solution to the latter pertinent problem. In contrast to the first reported solutions to this problem, we present a solution that does not involve any assumption on the group average reliability which makes our 1·esults more general than previous works. We devise a strategic game where we show that a perfect partitioning of the sensors into reliable and unreliable groups corresponds to a Nash equilibrium of the game. Furthermore, we give sound theoretical results that prove that those equilibria are indeed the 1111ique Nash equilibria of the game. We then propose a solution involving a team of Learning Automata (LA) to unveil the identity of each sensor, whether it is reliable or unreliable, using game-theoretic learning. Experimental results show the accuracy of our solution and its ability to deal with settings that are unsolvable by legacy works.
On the distribution of the time of the first communication release in wireless networks with caching
Matematicheskoe modelirovanie
Montenegrin Journal of Economics
The purpose of this study is to determine the conditions of institutional support for the digitiz... more The purpose of this study is to determine the conditions of institutional support for the digitization of the urban environment. The paper identifies the main features and analyzes the conditions for the effective functioning of smart cities. The main characteristics of the smart city are revealed: they are people-oriented, use data in a digital format and are based on bottom-up innovations. The paper considers the systematization of the principles and ideas of the theory of institutional modeling from the simplest level of modeling, and ending with the most difficult level consisting in describing the evolution of institutions. The importance of applying such an approach to the study of the institutional support of smart cities is shown. As part of the study of the leading cities in the field of building smart urban environment, priorities, institutions and goals of intelligent development have been highlighted. The paper discusses the problems of the development of smart cities in Russia, presents a number of steps to solve them. The theoretical significance of the study consists in the development of approaches to the institutional support of a smart city. The practical significance of the research lies in the formation of possible future studies of rational economic management in the conditions of digital society.
Information and Control Systems
Introduction: In 3GPP New Radio (NR) systems, frequent radio propagation path blockages can lead ... more Introduction: In 3GPP New Radio (NR) systems, frequent radio propagation path blockages can lead to the disconnection of ongoingsessions already accepted into the system, reducing the quality of service in the network. Controlling access to system resource byprioritizing for the ongoing sessions can increase the session continuity. In this paper, we propose resource allocation with a reservationmechanism. Purpose: Development of a mathematical model for analyzing the effect of this mechanism on other system performanceindicators – dropping probabilities for new and ongoing sessions and system utilization. The model takes into account the key featuresof the 3GPP NR technology, including the height of the interacting objects, the spatial distribution and mobility of the blockers, as wellas the line-of-sight propagation properties between the transceivers for mmWave NR technology. Results: We analyzed the reservationmechanism with the help of a developed model in the form of a resource...
Information and Control Systems
Introduction: One of the main advantages of multiple antenna systems is the support of multi-user... more Introduction: One of the main advantages of multiple antenna systems is the support of multi-user connections, simultaneouslytransmitting parallel data streams. This can significantly increase the overall system throughput. However, the spectral efficiency can be additionally increased through the usage of various dynamic strategies which take into account the current state of the system.Here we propose a method to evaluate the effectiveness of such strategies with the help of appropriate mathematical models. Purpose:Development of mathematical models for a multi-user MIMO system which would allow you to evaluate the average delay of a filetransfer. Results: Mathematical models of the MIMO system are presented in the form of discrete/continuous time queuing systemsfor three user service strategies. We provide formulas for estimating the average file transfer delay in a closed form, which simplifynumerical analysis as compared to the well-known methods using mathematical models in co...
Quantifying the Impact of Guard Capacity on Session Continuity in 3GPP New Radio Systems
IEEE Transactions on Vehicular Technology
Mathematics
We consider a queuing network with single-server nodes and heterogeneous customers. The number of... more We consider a queuing network with single-server nodes and heterogeneous customers. The number of customers, which can obtain service simultaneously, is restricted. Customers that cannot be admitted to the network upon arrival make repeated attempts to obtain service. The service time at the nodes is exponentially distributed. After service completion at a node, the serviced customer can transit to another node or leave the network forever. The main features of the model are the mutual dependence of processes of customer arrivals and retrials and the impatience and non-persistence of customers. Dynamics of the network are described by a multidimensional Markov chain with infinite state space, state inhomogeneous behavior and special structure of the infinitesimal generator. The explicit form of the generator is derived. An effective algorithm for computing the stationary distribution of this chain is recommended. The expressions for computation of the key performance measures of the...
IEEE Access
The new generation of communication technologies, named 5G, brings along a variety of emerging ap... more The new generation of communication technologies, named 5G, brings along a variety of emerging applications and services from both human and machine perspectives. The growing demand for bandwidth in 5G may therefore lead to massive deficiency in wireless spectrum availability despite its underutilization in urban areas. The Smart City paradigm assumes a multitude of communicating machines at high density, which requires improved spectrum management flexibility. The novel licensed shared access (LSA) framework that has attracted recent industrial and academic attention may become a feasible solution to leverage such underutilized spectrum more efficiently. This paper analyzes the effects of applying LSA in the Smart City context by proposing an appropriate mathematical model. Particularly, we focus on the vehicle-toeverything 5G use case where connected devices attempt to distribute their sensed data including occasional video information. The proposed analytical framework allows to capture the probabilities of rare events during such operation by providing with a high level of precision in the resulting performance estimates.
Wireless Communications and Mobile Computing
A diversity of wireless technologies will collaborate to support the fifth-generation (5G) commun... more A diversity of wireless technologies will collaborate to support the fifth-generation (5G) communication networks with their demanding applications and services. Despite decisive progress in many enabling solutions, next-generation cellular deployments may still suffer from a glaring lack of bandwidth due to inefficient utilization of radio spectrum, which calls for immediate action. To this end, several capable frameworks have recently emerged to all help the mobile network operators (MNOs) leverage the abundant frequency bands that are utilized lightly by other incumbents. Along these lines, the recent Licensed Shared Access (LSA) regulatory framework allows for controlled sharing of spectrum between an incumbent and a licensee, such as the MNO, which coexist geographically. This powerful concept has been subject to several early technology demonstrations that confirm its implementation feasibility. However, the full potential of LSA-based spectrum management can only become avail...
Product-Form Markovian Queueing Systems with Multiple Resources
Probability in the Engineering and Informational Sciences
In the paper, we study general Markovian models of loss systems with random resource requirements... more In the paper, we study general Markovian models of loss systems with random resource requirements, in which customers at arrival occupy random quantities of various resources and release them at departure. Customers may request negative quantities of resources, but total amount of resources allocated to customers should be nonnegative and cannot exceed predefined maximum levels. Allocating a negative volume of a resource to a customer leads to a temporary increase in its volume in the system. We derive necessary and sufficient conditions for the product-form of the stationary probability distribution of the Markov jump process describing the system.
Transactions on Emerging Telecommunications Technologies
1. Samuylov A, Ometov A, Begishev V, et al. Analytical performance estimation of network-assisted... more 1. Samuylov A, Ometov A, Begishev V, et al. Analytical performance estimation of network-assisted D2D communications in urban scenarios with rectangular cells.
Elektronika ir Elektrotechnika
Grids. In this paper and based on this methodology, we also present the performance tests carried... more Grids. In this paper and based on this methodology, we also present the performance tests carried out in laboratory environment on low voltage and in on-field conditions on medium voltage.
IEEE Access
Fifth generation (5G) cellular systems are expected to orchestrate a variety of air interfaces. I... more Fifth generation (5G) cellular systems are expected to orchestrate a variety of air interfaces. In this heterogenous setting 4G LTE systems will remain of special importance providing service over relatively large area not covered with 3GPP New Radio technology. However, the scarcity of radio resources below 6 GHz as well as constantly increasing user traffic demands call for efficient offloading strategy from LTE network. In this paper, we consider and compare two LTE session offloading strategies including LAA and WiFi offloading. Although by design, the LAA system supports quality-of-service (QoS) guarantees in terms of minimum throughput, the assured performance might still be violated by resource reallocations when satisfying the compulsory fairness criteria. To assess and compare performance of these schemes we develop an analytical framework that takes into account specifics of duty-cycle schedule-based LAA system with CAC, resource reallocation mechanism and realistic elastic traffic nature. As a special case of the developed framework we also address offloading of QoS-aware LTE sessions into conventional WiFi. Our numerical results indicate that WiFi offloading is characterized by a significantly greater number of offloaded sessions. However, this advantage comes at the expense of severe performance degradation in terms of minimum throughput guarantees. Implementing connection admission control procedures, LAA efficiently addresses this problem. We conclude that WiFi offloading of QoS-aware LTE sessions can be used in light traffic conditions only. On the other hand, offloading to the schedule-based LAA system allows to preserve QoS over a wide range of arrival traffic statistics.
IEEE Access
The 3GPP standardization rapidly moves forward with studies of a wider bandwidth waveform as well... more The 3GPP standardization rapidly moves forward with studies of a wider bandwidth waveform as well as adaptation of the emerging 5G New Radio (NR) based access to the unlicensed spectrum (NR-U). One of the basic architectures for NR-U involves carrier aggregation of an anchorlicensed -NR carrier and a secondary carrier in unlicensed spectrum, which altogether allows for seamless traffic offloading in scenarios where multi-gigabit data rates are required. While today's research on NR-U addresses mostly physical-and protocol-layer aspects, a system-level performance of NR-U offloading mechanisms has not been investigated thoroughly. In this work, we develop a mathematical queuingtheoretic framework that is mindful of the specifics of millimeter-wave (mmWave) session dynamics and may serve as a flexible tool for the analysis of various strategies for the integrated use of licensed and unlicensed mmWave bands in terms of the session drop probability and system utilization. To illustrate this, we select three distinct strategies (based on sequential service, probabilistic offloading, or proportional splitting) and complement our mathematical models with a detailed performance evaluation in a representative massive augmented / virtual reality (AR/VR) scenario. Based on this quantitative analysis of the selected schemes, we conclude that proportional splitting of traffic between the two mmWave bands leads to better performance. We believe that the contributed mathematical analysis can become an important building block in further system development and service optimization across many usage scenarios.
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Papers by Konstantin Samouylov