Wyniki wyszukiwania - BazTech

1

Single Linkage Weighted Steepest Gradient Adaboost Cluster-Based D2D in 5G Networks

Varadala Sridhar, Roslin S. Emalda

Journal of Telecommunications and Information Technology

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2023

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nr 1

60--65

EN

Efficiency of data transmissions with minimum latency levels and better resource utilization is a challenging issue in 5 G device-to-device (D 2D) environments. A novel technique referred to as single linkage steepest gradient gentle AdaBoost cluster-based device (SLSGAC) is introduced to improve device-to-device communications with minimum latency. The proposed technique uses the ensemble clustering approach to group mobile devices by constructing a set of weak clusters, based on the Minkowski single linkage clustering technique. In the weak clustering process, residual energy, bandwidth and SINR are estimated, and mobile devices are grouped based on the Minkowski distance measure. Results of the weak clustering process are combined to provide the final ensemble’s clustering output by applying the steepest gradient function to minimize the error rate. For each cluster, a head is selected from among the group members to improve the data transmission rate and minimize latency. Simulations are conducted comparing the proposed technique with the existing methods based on such metrics as energy efficiency, data delivery ratio, packet loss rate, throughput and latency.

2

Performance Analysis of Relay-Assisted Device-to-Device Communication

Hussain Zakir, Mehdi Haider, Saleem Syed Muhammad Atif, Mahboob Aashir

International Journal of Electronics and Telecommunications

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2022

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Vol. 68. No. 3

587--593

EN

Outage and Success performances of an amplify-and-forward relay-assisted D2D communication system over a κ-μ shadowed fading wireless link are presented here. Co-channel interference (CCI) is assumed to affect the D2D signals at relay and destination nodes. The system is analyzed with two scenarios, namely, with diversity combining and without diversity combining. Selection combining (SC) based diversity scheme is incorporated at the D2D receiver to combat fading conditions. The expressions for success and outage probabilities are presented by using the characteristic function approach. The expressions are functions of path-loss exponents, wireless link length between relay and D2D source node, wireless link length between the receiver node and relay, distances between interferers and the relay node, CCI distances from various devices of the system, fading channel. The numerical analysis for various scenarios is presented and analyzed.

3

LEES: a Hybrid Lightweight Elliptic ElGamal-Schnorr-Based Cryptography for Secure D2D Communications

Ambareen Javeria, Prabhakar M., Ara Tabassum

Journal of Telecommunications and Information Technology

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2021

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nr 2

24--30

EN

Device-to-device (D2D) communications in 5G networks will provide greater coverage, as devices will be acting as users or relays without any intermediate nodes. However, this arrangement poses specific security issues, such as rogue relays, and is susceptible to various types of attacks (impersonation, eavesdropping, denial-of-service), due to the fact that communication occurs directly. It is also recommended to send fewer control messages, due to authenticity- and secrecy related prevailing requirements in such scenarios. Issues related to IoT applications need to be taken into consideration as well, as IoT networks are inherently resource-constrained and susceptible to various attacks. Therefore, novel signcryption algorithms which combine encryption with digital signatures are required to provide secure 5G IoT D2D communication scenarios in order to protect user information and their data against attacks, without simultaneously increasing communication costs. In this paper, we propose LEES, a secure authentication scheme using public key encryption for secure D2D communications in 5G IoT networks. This lightweight solution is a hybrid of elliptic curve ElGamal-Schnorr algorithms. The proposed scheme is characterized by low requirements concerning computation cost, storage and network bandwidth, and is immune to security threats, thus meeting confidentiality, authenticity, integrity and non-repudiation-related criteria that are so critical for digital signature schemes. It may be used in any 5G IoT architectures requiring enhanced D2D security and performance.

4

Warstwa fizyczna sieci dostępu radiowego 5G według wydania 15 standardów 3GPP

Wesołowski K.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2018

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nr 8-9

558--562

PL

Scharakteryzowano podstawowe parametry warstwy fizycznej sieci dostępu radiowego przyszłych sieci 5G. Ostatnio została ona poddana standaryzacji przez międzynarodowe stowarzyszenie organizacji standaryzacyjnych 3GPP, a jej szczegóły sformułowano w wydaniu 15 jego standardów. Po krótkim omówieniu podstawowych scenariuszy zastosowania sieci 5G zarysowano nowe techniki, umożliwiające realizację jej wymagań. Następnie scharakteryzowano ogólnie podstawowe cechy warstwy fizycznej nowej sieci dostępu radiowego 5G. Przedstawiono wybrany rodzaj transmisji, modulacji i kodowania, a także strukturę ramki umożliwiającą elastyczną organizację transmisji. Zasygnalizowano również wyzwania technologiczne, które wymagają intensywnych badań nad ich rozwiązaniem.

EN

In the paper, basic physical layer parameters of the fifth generation wireless radio access system are characterized. These parameters have been standardized by 3GPP, the international association of standardization bodies and published in Release 15 of 3GPP standards. After short description of the main 5G network scenarios, new technologies enabling meeting 5G network requirements are presented. Then general characterization of the physical layer of the new radio access 5G network is described. In turn, applied waveform, modulations and channel coding are overviewed. The frame structure allowing for flexible transmission format is also shown. New technological challenges requiring effective solutions are also mentioned.

5

Systemy bezprzewodowe piątej generacji – nowości i wyzwania

Wesołowski K.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2015

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nr 4

115--119

PL

Przedstawiono nowe elementy i wyzwania stojące przed aktualnie opracowywanymi systemami bezprzewodowymi piątej generacji 5G Po określeniu wymagań dotyczących systemów 5G i przedstawieniu listy projektów UE poświęconych tej tematyce omówiono ideę sieci bezprzewodowych o szczególnej gęstości, proponowaną ramkę OFDM i przykładowe parametry sygnału. Rozpatrzono też możliwość zastosowania zakresu milimetrowego fal EM. Wspomniano o systemach MIMO wielkiej skali, możliwości zastosowania bezpośredniej łączności między terminalami sieci poruszających się oraz sieci o wysokiej niezawodności. Ostatnim zagadnieniem jest przewidywana w systemach 5G komunikacja pomiędzy urządzeniami.

EN

In the paper, basic new elements and challenges considered in the currently investigated fifth generation wireless communication systems are presented. After definition of the 5G requirements and presentation of the list of EU projects devoted to this topic, the idea of ultra dense networks, the proposed frame structure, exemplary OFDM signal parameters and possibility of application of millimeter wave frequency range are considered. In turn, massive MIMO systems, possibility of device-to-device communication, application of moving networks and ultra reliable networks are described. The last considered topic in the paper is machine-to-machine communications.