2018 IEEE 29th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)
Ultra Reliable Low Latency Communications (URLLC) is an important challenge for the next generation wireless networks, which poses very strict requirements to the delay and packet loss ratio. Satisfaction is hardly possible without introducing additional functionality to the existing communication technologies. In the paper, we propose and study an approach to enable URLLC in Wi-Fi networks by exploiting an additional radio similar to that of 802.11ba. We develop a mathematical model of a heterogeneous network with devices transmitting regular and URLLC data. With the model, we evaluate the efficiency of the proposed approach in terms of delay for URLLC traffic and throughput available for non-URLLC traffic. We show that our approach allows decreasing the delay by orders of magnitude, while the throughput is reduced insignificantly.
Approaches to the formation of service quality evaluation in 4G networks and to the evaluation of service quality in the networks of the new (fifth) generation are considered. The metrics and approaches to this evaluation are proposed, and evaluation criteria are determined. Possible ways of 5G networks development are described.
Consider the category of persons podvegayuschihsya radiation fields generated by radio equipment for cellular networks. A comparison of the permissible levels of radiation contained in national and international regulations. Designed pltnosti flow of energy in the typical four points near the base stations of cellular communication.
The smart monitoring system (SMS) vision relies on the use of ICT to efficiently manage and maximize the utility of network infrastructures and services in order to improve the quality of service and network performance. Many aspects of SMS projects are dynamic data driven application system where data from sensors monitoring the system state are used to drive computations that in turn can dynamically adapt and improve the monitoring process as the complex system evolves. In this context, a research and development of new paradigm of Distributed Big Data Driven Framework (DBDF) for monitoring data in mobile network infrastructures entails the ability to dynamically incorporate more accurate information for network monitoring and controlling purposes through obtaining real-time measurements from the base stations, user demands and claims, and other sensors (for weather conditions, etc.). The proposed framework consists of network probes, data parsing application, Message-Oriented Middleware, real-time and offline data models, Big Data storage and Decision layers., and Other data sources. Each Big Data layer might be implemented using comparative analysis of the most effective Big Data solutions. In addition, as a proof of concept, the roaming users detection model was created based on Apache Spark application. The model filters streaming protocols data, deserializes it into Json format and finally sends it to Kafka application. The experiments with the model demonstrated and acknowledged the capacities of the Apache Spark in building foundation for Big Data hub as a basic application for online mobile network data processing.
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability