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The 5th generation (5G) mobile communication systems are expected to revolutionize everything seen so far in wireless systems. The requirements for 5G vary by application but will include data rates ranging from very low sensor data to very high video content delivery, stringent low latency requirements, low energy consumption, and high reliability. All of these technological requirements are expected...
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The paper leverages the emerging paradigm of Network Function Virtualization (NFV) in an attempt to outline from the network management point of view the current trends on the road to 5G region. To that end, relevant architectural frameworks and concepts have been presented and the anticipated network densification through the notion of Edge Cloud has been discussed.Within this context, added value...
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We study co-primary spectrum sharing concept in small cell multiuser networks. Downlink transmission is considered with Rayleigh fading in interfering broadcast channel. Multiple-input-single-output (MISO) system is considered in two small cells. The sum rate maximization problem is studied in two cells having multiple users with multiple subcarriers. Zero-forcing (ZF) precoders are considered at...
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For over a decade the quest for new means to improve the efficiency of spectrum use has motivated researchers all over the world to come up with innovative concepts for spectrum sharing. During this time, several concepts have been created and investigated, however, only a small part of them has raised industry interest or stimulated further discussions in the regulatory domain. Even a smaller part...
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This paper summarizes the main initiatives toward 5G wireless communication networks. Emphasis is paid on the program and project activities as well as on the recent literature. A closer look to a wide range of European Union 5G related projects is conducted. Literature review is restricted to recent thematic IEEE CommunicationsMagazine 5G issues and relevant white papers from different sources. The...
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In this paper, we propose an agent-based model for spectrum trading in the shared use model of dynamic spectrum access. Spectrum trading is employed using the single-unit sealed-bid first-price auction, which takes into the account risk due to the imperfect spectrum sensing. Bidding strategies of the bidder are controlled by the reinforcement learning algorithm. We consider cooperative energy-based...
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In future 5G networks, in-band interference is perceived as one of the most critical performance bottlenecks. While current solutions classically treat interference as an additional source of noise, recent advances in information theory show that interference is not necessarily an opponent, but might be cancelled or supressed. In this paper, we propose a three-fold optimization method, which couples...
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The fifth generation of wireless networks should enable the same experience to users at home, in the office or on the move thanks to seamless handover. Call admission control (CAC) provides the means to avoid call drops due to lack of resources at a target cell during handover. The purpose of the CAC is to decide if handover should be initiated or if a new call can be established. A specific quantity...
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The hugely increasing demand for mobile broadband access to Web-based services and APPs will soon challenge even the UMTS Long Term Evolution (LTE) cellular technology and its advanced version LTE-A. For this reason the endeavor toward the Fifth Generation (5G) of cellular technology has started. Currently, there is no formal definition of 5G systems but they will encompass heterogeneity of radio...
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This paper studies possibility of using full-duplex (FD) radios in underlay device-to-device communication (D2D) in cellular networks. We consider a cellular system with one D2D pair and one cellular user. Cellular user is sharing the radio resources with D2D link which is equipped with full-duplex radios. The problem of sum-power minimization of cellular system and D2D link both in uplink and downlink...
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We propose linear coordinated transmit-receive beamforming methods for spatial underlay direct device-to-device (D2D) communication in cellular networks where the user terminals (UTs) employ multiple antenna elements. For a D2D terminal pair, direct communication is a beneficial alternative compared to the cellular mode, where the UTs communicate to each other via a base station (BS) that acts as...
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In this paper we contemplate 5G frame structure for dense deployment. We discuss harmonized OFDM concept, in which the cyclic prefix length and subcarrier spacing are functions of carrier frequency while FFT size and base clock remain constant. The subframe structure consists of time separated control and data, enabling low latency, flexible UL/DL ratio switching and high spectral efficiency with...
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For pilot sequence based multiple input multiple output (MIMO) channel estimation, the arrangements of pilot symbols, such as the block or comb type arrangement, is known to play an important role. In this paper we compare the performance of block and comb pilot symbol patterns in terms of uplink mean square error (MSE) and spectral efficiency when the receiver at the base station employs least square...
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This article reviews existing related work and identifies the main challenges in the key 5G area at the intersection of waveform design and large-scale multiple antenna systems, also known as Massive MIMO. The property of self-equalization is introduced for Filter Bank Multicarrier (FBMC)-based Massive MIMO, which can reduce the number of subcarriers required by the system. It is also shown that the...
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A distributed antenna system (DAS) architecture is considered to be a key enabler for further Network Virtualization where different network configurations are created as needed by a centralized decision making unit that is typically integrated into the Cloud Radio Access Network (C-RAN) which offers a potential architecture for 5G wireless communication systems. Many schemes have been proposed for...
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This text simulates sharing conditions between incumbent spectrum user and mobile network operator (MNO) at the frequency band 2.3 – 2.4 GHz. The probability of interference between radio systems helps to determine appropriate frequency planning rules and specific limits for system performances. Due to rapid technology development in mobile devices and network technologies an explosive growth in mobile...
