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Improvement of Relay Link Capacity in a Multi-hop System by using a Directional Antenna in LTE-A Cellular Network

Aldhaibani J. A., Yahya A., Ahmad R. B.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 11

195-201

EN

This paper introduces a new approach for enhancing relay link quality. Two types of antennas were proposed at the relay node (RN). The first type is the directional antenna, which is directed toward the base station to achieve the maximum relay location range and improve the relay link quality, thereby reducing outage probability by increasing relay link capacity. The second type is the omni-directional antenna, which is used for the exchange of information between the RN and attached users. The optimum relay location was derived, thus ensuring the maximum spectral efficiency and best received signal strength over the relay link and cell edge. An improvement of 32% in spectral efficiency and a difference of−62 dBm to −50dBm in received signal strength at the relay link has been observed while considering Interference from neighboring cells. An ATDI simulator, which manages the digital cartography for the first tier of interference in urban areas, verified the numerical results.

PL

Opisano metody poprawy transmisji w sieci komórkowej LTE. Zbadano dwie anteny – antenę kierunkową i wielokierunkową. Antena kierunkowa zapewnia najlepsza jakość transmisji, antena wielokierunkowa jest użyta do wymiany informacji między węzłem a użytkownikiem.

2

Requirements of 4G-Based Mobile Broadband on Future Transport Networks

Fricke M., Heckwolf A., Herber R., Nitsch R., Schwarze S., Voß S.

Journal of Telecommunications and Information Technology

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2012

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nr 2

21-28

EN

Long term evolution technologies provide new standards in mobile communications regarding available bandwidth. It is expected that users of one radio cell will share more than 100 Mbit/s in future. To take advantage of the full feature set of next generation mobile networks, transport network design has to face new requirements, caused by the architectural changes of LTE technologies. Especially the newly defined X2 interface impacts on the transport network requirements. X2 enables direct communication between evolved base stations (eNBs) and thus, enforces local solutions. At the same time a tendency of locating network elements at fewer, central sites to reduce operational expenditure can be observed, in particular concerning the transport layer. This leads to the question of how the direct X2 connection of eNBs on the logical layer can be accommodated with a general centralization of transport networks. Our considerations show that for LTE, a centralized transport network is able to realize the local meshing between eNBs. However, for LTE Advanced, the standards currently discussed by the 3GPP initiative could lead to enhanced requirements on the X2 interface latency. Consequently, the implications for the network architecture have to be analyzed in more detail.

3

Przyszłościowe kierunki badawcze w dziedzinie technik komórkowych nowej generacji i systemowych rozwiązań aplikacyjnych

Gajewski S.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2010

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nr 2-3

62-67

PL

Przedstawiono ważne kierunki badawcze w zakresie nowych technik transmisyjnych, stosowanych w systemach komórkowych nowej generacji. Wskazano interesujące funkcje systemów komórkowych, umożliwiające tworzenie rozbudowanych systemów informatyczno-telekomunikacyjnych, przeznaczonych do monitoringu oraz zastosowań związanych z bezpieczeństwem w ruchu drogowym i poprawą bezpieczeństwa obywateli. Omówiono przykład systemu fotoradarowego RSMAD umożliwiającego poprawę bezpieczeństwa w ruchu drogowym.

EN

In the paper the important directions of research in new transmission technologies used in next-generation mobile systems were presented. Some interesting features of cellular systems, enabling the construction of elaborate systems of information and telecommunications, for monitoring as well as for applications related to a road traffic safety and improving public security were identified. The RSMAD system as an example of the system for improving a traffic road safety was discussed.