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Abstract: Research subject. This article is devoted to a review of modern technologies for building RFID identification systems, which are an integral part of the Internet of things. The general characteristics of RFID systems and their comparison with other identification methods, the classification of tagging technologies, the features of active, semi-passive and passive RFID tags with a chip, the issues of standardization of RFID technologies are considered. Method. The study is based on an analysis of technical solutions adopted by manufacturers of RFID tags and developers of relevant standards. Core results. The obtained survey, unlike the known ones, reveals the main features of passive and active tags with a chip, which allows making rational decisions when choosing the element base of RFID identification systems. Practical relevance. The practical significance of the results obtained is the creation of scientifically grounded recommendations on the creation and planning of RFID systems and their use in the construction of Internet applications of things.

Keywords: Internet of things, identification of objects, RFID system, standardization of RFID technologies.

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Abstract: Wi-Fi networks are one of the most important wireless access technologies. In recent years more and more WLANs meet the requirements of the high client density support. This series of articles have the goal to make an analysis of high density WLAN design process concepts, show their specialties, and generalize the best practices. Research subject. The present work is devoted to the definition of the high density Wi-Fi networks and their special aspects. Method. The ground for this work are: Wi-Fi solution vendors design guides, recommendations of the experts, some scientific works and own more than 5-year design practice. Core results. High density WLANs are defined and their differentiators are shown. Practical relevance. The analysis carried out demonstrates the key differences in high density WLANs design goals in comparison to traditional architecture WLANs.

Keywords: IEEE 802.11, high density, WLAN, Wi-Fi.

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Abstract: The consideration of radio interference in IEEE 802.11 networks is an important task in all stages of WLAN deployment – from design to installation. But in high density wireless networks this factor is truly one of the most important ones. The correct design of high density Wi-Fi networks is impossible without understanding of different types of radio signals that operate in the area, as their influence on the WLAN designed highly depends on the nature of the signals. Research subject. The present work is devoted to the radio interference classification and its influence on high density Wi-Fi networks. Method. The ground for this work are: Wi-Fi solution vendors design guides, recommendations of the experts and own more than 5-year design practice. Core results. The different types of interference influence on WLAN have been analyzed. The mechanisms that provide WLAN operation during interference are shown. Practical relevance. The importance of taking into consideration of the full view of transmit spectrum mask is shown. This is crucial when considering the adjacent channel interference during the channel planning of the WLAN.

Keywords: IEEE 802.11, high density, interference, Wi-Fi.

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Abstract: One of the key tasks in IEEE 802.11 networks design process is network sizing. Under sizing we understand the accordance to the initial requirements of service quality while taking into the consideration the network scale. In high density wireless networks this task is especially important because their characteristics (such as interference, channel resource usage, efficiency, etc.) are in nonlinear dependence of their scale. Research subject. The present work is devoted to the sizing process in the high density Wi-Fi design. It includes client devices count and their support of new IEEE 802.11 standard revisions as sizing parameters as well as client capacity increase methods in network design. Method. The ground for this work are: Wi-Fi solution vendors design guides, recommendations of the experts and own more than 5-year design practice. Core results. The mixed client count in high density WLAN has been analyzed as well as its influence on the wireless network coverage planning. Practical relevance. The scaling perspectives of the high density WLAN in the mixed client situation are shown. The methods of the client capacity increase have been analyzed and practical estimations have been provided.

Keywords: IEEE 802.11, sizing, high density, client count, Wi-Fi.

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Abstract: Intelligent transportation systems are the fast-growing, key and promising block in the "Smart City" concept. Intelligent transportation systems - this is the area of contact between the transport industry and the telecommunications technology industry. Research subject. The article describes current state of intellectual transportation systems development in Russia and in the world. The main parameters of the functioning of intelligent transportation systems based on software defined network, management methods and statistical estimation are determined. Method. Scenarios for testing ITS and a controller for a software-defined network are proposed, and a model network for a fullscale experiment is developed. Core results. The developed architecture of a software-defined transportation self-organizing network can be used as an improved ITS model with a reliable control element. The testing methodology will allow to flexibly design segments of intelligent transport systems with optimal use of network resources. Practical relevance. The architecture of the transportation selforganizing network with SDN-based management presented in the article will significantly improve the efficiency of modern ITS, traffic safety, actualize the information provided to customers, and reduce the cost of networks architecture. The results of future studies based on the developed testing scenarios will allow implementing a balanced network architecture.

Keywords: Intelligent transportation systems, Software-Defined networking, model network, develop, testing.

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Abstract: The documentary network is one of the secondary networks of the existing communication system and is intended to ensure the documented exchange in the command and control of troops and weapons. Currently, the combined arms are equipped with hardware complexes of a unified system of tactical control. Research subject. The article is devoted to the proposals for the construction of local networks in the connection to ensure open documentary communication. Method. The structure of the documentary link network is considered. The modeling of the load circulating with it is carried out, which allowed combining heterogeneous means of the Main results used on the communication node. Core results. A comparison of the existing documentary communication network and recommendations on the possibility of installing a set of programs of complex technical means of message processing in hardware and organization of the local network on wired lines on the node communication combined arms. Practical relevance. The developed structure allows unifying the network of documentary connection and bringing it to all participants of information exchange.

Keywords: Open documentary communication network, broadband access radio stations, complex of technical means of message processing, complex hardware communications, command and staff machines, local area network, distributed switching equipment, single address space.

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Abstract: Recently, medical applications of the Internet Things are gaining popularity, as more and more users are trying to normalize and improve their daily lives and their health. Research subject. This article is devoted to medical Internet applications. The article shows the technologies, as well as their characteristics. Method. Analysis and comparison of existing applications and technologies of communication between devices is carried out. The structure of data exchange between medical devices is considered. Practical relevance. The results of the analysis carried out in the article can be used to select one or the other technology for wireless data transmission. Also, the analysis can help select the right medical application for the user.

Keywords: Internet Things, medical applications, medical networks.

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Abstract: Method of the geochronological tracking is an assembly of processes that accumulate and integrate data about geographic relocation of historical figures for a given time interval and represent the results as a generalizing graph in GIS. Research subject. Information technology of the geochronological tracking from the viewpoint of its applied aspect, this information technology is scientific methodological and program tools to automatize certain issues related to biographical and geographical data merge on the basis of geoinformation systems and corresponding geoinformation technologies. It is an example of a specific information technology developed to help employing geographical interpretation of their subject domain when solving research problems. Method. The methodology bases on the object-oriented approach to modeling within GIS domains and ontologies widely used in modern programming and complex software systems development. Core results. Hypotheses on the stable tendencies in migration could be represented as the above graph's sub-graphs. Practical relevance. Such tendencies testing would be reduced to the search and evaluation of the statistical significance for the matching graphs' isomorphism. The novelty of the solution proposed is the principles of biographical and geographical data integration. The proposed paper deals with a consideration of qualitatively new possibilities of such an approach and the corresponding mathematic and algorithmic apparatus.

Keywords: Geographic information systems, GIS – technologies for historic research; geochronological track and tracking; graphs' isomorphism; statistical hypotheses testing; GIS based interdisciplinary research.

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Abstract: Research subject. The possibility of random, deterministic, spatial and collision algorithms of anticollision is analyzed in the article and the collision approach is applied to the SAW tags. A classification is made of anticollision algorithms suitable for use in tags on chips and labels that use surface acoustic wave technologies. We consider random, deterministic and spatial algorithms suitable only for RFID tags with a chip. The area of application of the correlation algorithms based on the procedures for calculating the mutual and auto-correlation functions of the emitted signals is determined. Method. The research is based on the methods of multiple access in infocommunication networks and the theory of signals. Core results. The approach of obtaining groups of codes with given correlation properties is presented. Practical relevance. The obtained results allow creating RFID systems with the number of tags necessary for practical use.

Keywords: Multiple access, object identification, RFID system, anticollision algorithms.

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Abstract: Research subject. The paper is devoted to the problems of question-answer systems constructing (QA-systems). The matter of the study is discussion of approaches to the automatic filling of the database of the QA-system based on the analysis of the unstructured text sources currently available in the public domain of Internet. The analysis revealed that the following ways of implementing QA-systems are distinguished: based on inference for ontologies, rules and syntax, using artificial neural networks. Method. The methods for automatically search of question-answer pairs based on the structure of sentences and on the basis of associative-ontological analysis has developed and tested in the research. Core results. The method based on the analysis of the structure of sentences is effective for texts such as lists of frequently asked questions (FAQ), as well as literature texts containing dialogs, direct speech, based on preliminary processing of the text, expressed in the form of a heuristic rule. The method based on associative-ontological analysis is focused to the class of reference and dictionary texts and is based on the assumption that in the descriptive text there is a sentence (or a group of sentences) containing the main idea of the text. In this case, the title of the text can be considered a question, and this sentence (or a group of sentences) is the answer. We need to make the selection of meaning-generating sentences due to the semantic reduction of the text automatic. For this purpose, algorithms of self-referencing are applied based on the associative-ontological approach to the processing of texts in natural language. Practical relevance. For the experimental verification of the possibility of creating an open QA-system based on the automatic collection of question-answer pairs from the Internet, a prototype of a collection module for the database of the QA-system was developed.

Keywords: question-answer pair, associative-ontological analysis, text, automatic text processing, natural language.