Система вивантаження даних за технологією D2D у неліцензованому діапазоні частот у складі систем зв’язку 5G

Abstract

With a constant increase in the number of users and the amount of data that they transmit among themselves, modern communication system networks cannot cope with the download. As an alternative to network compression, to increase the capacity of the network, mobile traffic is unloaded in the form of a direct connection D2D (device-to-device) between the equipment of users who are in close proximity to each other. Thus, D2D interaction is one of the most promising areas of development of communication systems, because it is becoming a new component in addition to the mobile network. It is important that this technology ensures the interaction of mobile network users without the use of a centralized infrastructure, which reduces its load. This interaction allows you to upload data streams from the mobile network to the D2D system, which can operate at unlicensed frequencies. As a result, the D2D system provides shorter connections for communications, increased energy efficiency and better traffic flow management. The development of D2D technology is a simple and reliable way to increase the bandwidth of mobile networks without the need to change its structure. But at the same time, several features arise that are related to the consideration of the interference and the distribution of radio channel resources. In this work, we consider a model of a D2D direct connection system with mobile support that serves streams of user data (sessions), as well as a way to control the downloading of traffic from mobile network to a D2D connection. The above theoretical and simulated results allow us to study communication system with the possibility of D2D interaction, to evaluate their capacity and energy efficiency. The presented mathematical approach takes into account the dynamics of user traffic in time and the placement of system nodes in space, which is confirmed by simulation results.

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