A MODEL AND METHOD OF MULTI-CONNECTIVITY FOR ULTRA-RELIABLE 5G CONNECTIONS
- D.V. Kashkarov, The Bonch-Bruevich Saint-Petersburg State University of Telecommunications (SPbSUT), department of communication networks and data transmission (CN&DT), postgraduate; dk@sigma-spb.net
- A.I. Paramonov, SPbSUT, department of CN&DT, professor, Dr. Sci.(Tech.); alex-in-spb@yandex.ru
- A.E. Koucheryavy, SPbSUT, head of the department of CN&DT, scientific chief of innovation infocommunications Lab of PJSC Rostelecom in SPbSUT, professor, Dr. Sci.(Tech.); akouch@mail.ru
Keywords: telecommunication network, URLLC, ultrareliable connections, ultra-low latency.
The paper presents an analysis, model, and method of solving the problem of ensuring the reliability of data delivery when organizing ultra-reliable and low latency connections (URLLC) in 5G networks. An approach based on the organization of multiple connections (multi-connectivity) and duplication of transmitted data is considered. An analytical model is presented for assessing the probability of failure, taking into account the traffic intensity, the probability of failure of elements, and the number of used connections. A method for increasing the reliability of data delivery by optimizing the number of connections is proposed.
FAST DEEP REINFORCEMENT LEARNING IN QUALITY-OF-SERVICE AWARE LoRa FOR RESOURCE CONSTRAINED IoT ENVIRONMENT
- M.S.A. Muthanna, The Bonch-Bruevich Saint-Petersburg State University of Telecommunications (SPbSUT), department of communication networks and data transmission (CN&DT), postgraduate; muthanna@mail.ru
- A.S.A. Muthanna, SPbSUT, department of CN&DT, associate professor, Ph.D.; ammarexpress@gmail.com
- A.S. Borodin, representative of PJSC Rostelecom in the ITU, Ph.D.; aleksey.borodin@rt.ru
Keywords: long-range communication, LoRa, Internet of Things, IoT, transmission policy parameters optimization, deep reinforcement learning, Quality of Service, QoS.
Achieving high Quality of Service (QoS) remains a challenge for LoRa technology. However, high QoS can be achieved via optimizing the transmission policy parameters such as bandwidth and code rate. Existing approaches do not provide an opportunity to optimize the LoRa networks' data transmission parameters. The article proposes transmission policy enforcement for QoS-aware LoRa networks. The QoS parameter ranking is implemented for IoT nodes where priority and non-priority information is identified by the new field of LoRa frame structure (QRank). The optimal transmission policy enforcement uses fast deep reinforcement learning that utilizes the environmental parameters including QRank, signal quality, and signal-to-interference-plus-noise-ratio. The transmission policy is optimized for spreading factor, code rate, bandwidth, and carrier frequency. Performance evaluation is implemented using an NS3.26 LoRaWAN module. The performance is examined for various metrics such as delay and throughput.
TELECOMMUNICATION NETWORKS AS A BASE FOR BRIDGING THE DIGITAL DIVIDE BETWEEN RUSSIAN FEDERATION REGIONS
- N.A. Chistova, The Bonch-Bruevich Saint-Petersburg State University of Telecommunications (SPbSUT), department of communication networks and data transmission (CN&DT), postgraduate; chistova.na@spbgut.ru
- A.S. Borodin, representative of PJSC Rostelecom in the ITU, Ph.D.; aleksey.borodin@rt.ru
- A.E. Koucheryavy, SPbSUT, head of the department of CN&DT, professor, Dr. Sci.(Tech.); akouch@mail.ru
Keywords: ultra-low latency communication networks, digital cluster, gross regional product, distances between settlements in rural areas.
The article is devoted to the analysis of the capabilities of telecommunication networks with ultralow latency to reduce the digital divide between the regions of the Russian Federation. The main result of the article is to establish the relationship between the gross regional product and the share of people employed in the field of informatization and communications in the total number of people employed in all industries. The results of the article can be used by interested ministries and departments in the implementation of the digital economy program, scientific and design organizations in the planning and design of communication networks, as well as by universities in the educational process.
A METHOD FOR ELIMINATING LOOPS IN A CLOCK SYNCHRONIZATION NETWORK
- M.V. Lobastova, The Bonch-Bruevich Saint-Petersburg State University of Telecommunications (SPbSUT), department of communication networks and data transmission (CN&DT), senior lecturer; mlobastovabk1@rambler.ru
- A.Yu. Matukhin, SPbSUT, department of CN&DT, associate professor, Ph.D.; matukhin@list.ru
- A.E. Koucheryavy, SPbSUT, head of the department of CN&DT, scientific chief of innovation infocommunications Lab of PJSC Rostelecom in SPbSUT, professor, Dr. Sci.(Tech.); akouch@mail.ru
Keywords: network clock synchronization, synchronization network loops, connectivity component, reachability matrix, connectivity matrix, loop matrix.
The article discusses the issues of the organization of clock network synchronization in 5G networks. A new method of detecting and eliminating loops in a synchronization network based on determining the components of the graph connectivity and analyzing the graph cycle matrix of a synchronization network is proposed, and the efficiency of its utilization is estimated. The main mathematical apparatus used to describe the proposed method is the theory of graphs and matrices.
PLANNING OF THE STRUCTURE OF 5G TRANSPORT NETWORKS BASED ON SDN/NFV TECHNOLOGIES
- A.Yu. Tsym, FSUE ZNIIS, acting director of NTs-21, Dr. Sci.(Tech.); 4 639 528@mail.ru
- O.A. Bychkova, FSUE ZNIIS, acting general director; o.bychkova@zniis.ru
Keywords: transport networks, fifth generation, 5G, software-defined networks, structure, planning, controllers, switches.
The basic requirements for the construction of 5G transport networks based on the technologies of software-defined networks (SDN) and network function virtualization (NFV) are formulated. The main provisions of a typical methodology for the planning of the structure of 5G transport networks are presented. Algorithms for calculation and optimal location of controllers in the structure of 5G networks are shown. Algorithms for determining the optimal groups of switches, the total load on which does not exceed the maximum performance of 5G network controllers, are also discussed.
POSSIBILITIES OF REDUCING HARDWARE AND TIME REDUNDANCY IN FACILITIES FOR DETECTING AND CORRECTING BYTE ERRORS IN DIGITAL DATA TRANSMISSION SYSTEMS
- A.A. Pavlov, Branch of the Military Academy of Strategic Missile Forces named after Peter the Great (MA SMF), professor, Dr. Sci.(Tech.); Pavlov_iif@mail.ru
- Yu.A. Romanenko, MA SMF, leading researcher, professor, Dr. Sci.(Tech.); info@iifrf.ru
- A.N. Tsarkov, Interregional Public Institution (IPI) Institute of Engineering Physics, president-chairman of the management board, professor, Dr. Sci.(Tech.); info@iifrf.ru
- A.Yu. Romanenko, IPI Institute of Engineering Physics, researcher, Ph.D.; info@iifrf.ru
- A.A. Mikheev, IPI Institute of Engineering Physics, junior researcher; info@iifrf.ru
Keywords: digital data transmission system, correcting algebraic linear code, error bytes, information bits, verification bits, error syndrome, additive error vector.
The necessity of developing a methodological apparatus related to the construction of a code that corrects errors in a given number of bytes of information with algebraic syndrome decoding and the estimation of hardware and time costs associated with this purpose is justified. The rules for constructing a correction code that corrects errors in a given number of bytes of information, implementing a linear procedure for constructing a correction code with syndrome decoding and using an additive error vector, are presented. This method made it possible to reduce the hardware costs for constructing a decoding device (reducing the amount of memory for storing the values of error vectors). Expressions are obtained for estimating the hardware costs of encoding and decoding information when using the proposed method of correcting packet errors.
NON-ORTHOGONAL MULTIPLE ACCESS BASED ON PARTIAL CODING
- D.K. Mazurenko, FSUE ZNIIS, chief researcher, Ph.D.; dm.ma2010@yandex.ru
Keywords: 5G networks, 6G networks, frequency spectrum, signal spectral power density, partial coding, Fourier transform, signal mutual influence suppression, reduced computing costs, numerical mathematical modeling of communication systems.
The article considers the increasing the efficiency of using the frequency spectrum when building 5G and 6G cellular communication systems and the problems of reducing computational costs when implementing an algorithm for sequential suppression of the mutual influence of signals. The essence of the new principle of non-orthogonal multiple access based on partial coding is analyzed in detail, and it is compared with the Power Division Non-Orthogonal Multiple Access (PD-NOMA) method. The results are obtained using the software Modeling Telecomm intended for numerical mathematical modeling of communication systems at the physical level.
PROBLEM STATEMENT OF JOINT ANTENNA SELECTION AND PRECODING IN MASSIVE MIMO COMMUNICATION SYSTEMS
- V.B. Kreyndelin, Moscow Technical University of Communications and Informatics (MTUCI), chief of the department of electric circuit theory, professor, Dr.Sci.(Tech.); vitkrend@gmail.com
- M.V. Golubev, MTUCI, postgraduate; m.golubyev@gmail.com
Keywords: precoding, Massive MIMO, antenna selection, reduced channel matrix.
Joint precoding and antenna selection both on transmitter and receiver sides is one of the promising research areas for evolving toward the Multiple Transmission and Reception Points (Multi-TRP) concept in Massive MIMO systems. This technology is under active development in the coming 5G 3GPP releases. We analyze legal restrictions for the implementation of 5G Massive MIMO technologies in Russia and the specifics of the implementation of the developed algorithm in the millimeter wavelength range. Algorithms of antenna auto-selection matrix formation on both transmitting and receiving sides are considered. Two criteria are used for joint antenna selection and precoding: maximizing mutual information and minimizing mean square error.
THE PHYSICAL BASIS FOR THE USE OF REFLECTIVE VOLUME HOLOGRAMS IN RADIO PHOTONICS DEVICES
- A.G. Prygunov, Don State Technical University, department of radio electronics, associate professor, Ph.D.; agprygunov@mail.ru
Keywords: radio photonics, volume hologram, radio signal, optical emission, modulation, electro-optical crystal, phase of light flux, interferogram, mathematical model, sensitivity.
The technology of creating radio-photonics devices based on the use of volume reflective holograms is proposed. A mathematical model of the relationship between the parameters of the radio signal and the spatial-spectral distribution of the optical field intensity in the plane of the interferogram formed by light fluxes diffracted on the volume hologram is constructed. The sensitivity of the parameters of the interferogram generated in a holographic radio photonic device is analyzed.
