Научный журнал «ИНФОРМАЦИОННЫЕ ТЕХНОЛОГИИ И ТЕЛЕКОММУНИКАЦИИ»
Сообщение
2023, Vol. 11, Iss. 1 |
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Task Offloading Methods in Multi-Access Edge Computing Systems
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E. Chipsanova, V. Elagin
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Abstract: Problem definition. Multi-access edge computing is a promising solution that can solve capacity and performance issues in legacy systems such as mobile cloud computing. Problems include core network congestion, high latency, poor quality of service, high utility cost of resources such as bandwidth and energy. The above problems arise due to the limited resources of mobile devices, when connecting with multiple hops between end users and the cloud, high load from resource-intensive and delay-critical applications. Methods used: comparative evaluation method. Novelty: Methods of task offloading in boundary computing systems with multiple access are analyzed. Three methods of task offloading for comparative analysis are proposed. Result: familiarization with the existing methods of task offloading, as well as identification of the most relevant from the presented ones. Practical significance: in the proposal of the most relevant method in the issue of task offloading in networks of boundary computation with multiple access.
Keywords: task offloading, multi-access edge computing, fifth generation network, adaptive structure, COSTA, linear regression.
DOI 10.31854/2307-1303-2023-11-1-1-15
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Approaches to Evaluating the Quality Characteristics of Combined Infocommunication Services
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N. Redrugina
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Abstract: Problem definition. This article is an introduction to the development of methods and models for assessing the quality characteristics of combined infocommunication services. Novelty. Approaches to modeling two functionally different types of services are presented: session and transactional. Result. The principle of separation and further modeling of the complex is described infocommunication services. Practical significance. The proposed approaches will allow assessing and managing the quality of service, reducing modeling time due to clearly the described classification of services based on the principle of user interaction and the corresponding quality characteristics.
Keywords: combined services, infocommunication systems, simulation modeling, mathematical models, transactions, workflow, work-flow, user sessions, QoS (Quality of Service).
DOI 10.31854/2307-1303-2023-11-1-16-25
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Application of Shortest Path Algorithms in Forming the Flight Route of an Unmanned Aerial Vehicle
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R. Mikhailov, D. Tsulun
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Abstract: Problem definition. Unmanned aerial vehicles are used in all fields of activity, in particular for monitoring (reconnaissance). However, modern methods of controlling them do not allow for automated formation of the flight route, taking into account the importance of monitoring objects from the position of effective application of the target load. To eliminate this disadvantage, it is proposed to use algorithms for finding shortest paths underlying routing protocols in telecommunication networks. The aim of the work is research on the routing of an unmanned aerial vehicle under enemy countermeasures (adverse conditions), as well as the development of an automated formation of the flight route. Methods used The elements of the scientific and methodological apparatus of graph theory, the theory of the effectiveness of purposeful processes and the theory of probability were used. Novelty: the elements of the novelty of the presented solution in the routing procedure of an unmanned aerial vehicle are taking into account the impact of destructive factors on it in combination with the probability of the payload performing the target function with the required efficiency. Also, the elements of novelty should include the development of a topological model of the flight zone, taking into account the actual conditions of application of the target load on objects. Result: The directions of modification of Dijkstra and Bellman-Ford algorithms in the direction of their application in the routing of an unmanned aerial vehicle are shown. Practical significance: The results obtained will increase the efficiency of using the target load of an unmanned aerial vehicle when performing various classes of tasks.
Keywords: unmanned aerial vehicle, routing, monitoring.
DOI 10.31854/2307-1303-2023-11-1-26-38
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Study of Guard Interval Duration Impact on the Operation of IEEE 802.11 Network
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A. Vikulov, S. Skorobogatova
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Abstract: Purpose. One of the new additions in the IEEE 802.11n standard amendment was the introduction of the short inter-symbol guard interval, which makes it possible to operate at slightly higher data rates. However, using a short guard interval is not always recommended. The fact is that on some types of sites where radio coverage is provided, the peculiarities of signal propagation with a short guard interval may give worse frame retry rate. In modern networks, this aspect remains more relevant than ever, and the task of correct guard interval configuration remains relevant for both the designer and the administrator of a wireless network. In order to conduct a comparative analysis of the measurement results with a short and long guard inter-symbol interval, it is necessary to conduct a full-scale radio site-survey of industrial WLAN site. As part of the present experiment, a WLAN was investigated at a site in one of the industrial zones of St. Petersburg. The main goal of the work is to experimentally determine the benefits that can be obtained from choosing a modulation and coding scheme with a long inter-symbol guard interval using the example of a distributed wireless network of the IEEE 802.11n/ac/ax standard. A related goal is to experimentally test the potential for reducing the radiation power of access points radios in order to improve network performance. Methods. Conducting a radio survey of a wireless network at a typical industrial site with subsequent analysis of its results. Novelty. The novelty of the presented solution includes a full-scale examination of an actually operated industrial network with simultaneous monitoring of characteristics at various levels of the OSI model: physical (spectrum analysis), channel (protocol analysis), application (control of application operation). Results. Analysis of the collected data shows a practically significant difference between the values of the frame retry rate for different values of the duration of the inter-symbol guard interval and the radiation power of the radio modules of the access points. Practical relevance. In is quantitatively shown that there is a reduction in frame retry rate by 8-10% in an production wireless network, achievable through correct control of the inter-symbol interval length for an industrial site.
Keywords: Wi-Fi, IEEE 802.11, wireless network, guard interval, error rate, site-survey, wireless design.
DOI 10.31854/2307-1303-2023-11-1-39-49
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Migration Route Selection for a Microservice in a Fog Computing Network
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M. Tefikova, E. Kuzmina, A. Volkov
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Abstract: Purpose. The new generation of communication networks has provided the basis for the realization of new classes of services, one of which are URLLC services. These services include concepts such as Tactile Internet. The transmission medium for URLLC requires high bandwidth and reliability of communication channels as well as ultra-low latency in the network. To cover these requirements, various technologies, such as fog computing and microservice architecture, are introduced into the architecture of networks. The latter is more often recommended to be used together with support for microservice migration between devices. A related goal is to determine the efficient route to the destination server. Methods. Conducting research on a model network with the collection of real load statistics from the network nodes and their analysis to determine the most efficient migration route for microservice according to the proposed algorithm based on these data. Novelty. The novelty of the presented method consists in adapting the classical algorithm of route selection in a graph to solve the actual problem of microservice migration route selection. Results. The parameters that need to be considered for efficient routing during microservice migration and the level of network architecture that should control the migration were defined. The results have shown that the proposed method is preferred over the AODV protocol. Practical relevance. It is quantitatively shown that using the proposed method the CPU resources consumption on the network nodes during microservice migration can be reduced total by 77 %, the RAM resources usage by 14 %, the percentage of lost packets on the used communication channels can be reduced total by 7 %, which would provide higher network reliability and increase its performance.
Keywords: fifth generation communication networks, fog computing, microservice architecture, microservice migration, routing.
DOI 10.31854/2307-1303-2023-11-1-50-60
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