Book•
4G: LTE/LTE-Advanced for Mobile Broadband
21 Mar 2011-
TL;DR: In this article, the authors focus on LTE with full updates including LTE-Advanced to provide a complete picture of the LTE system, including the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance.
Abstract: Based on the bestseller "3G Evolution - HSPA and LTE for mobile broadband" and reflecting the ongoing success of LTE throughout the world, this book focuses on LTE with full updates including LTE-Advanced to provide a complete picture of the LTE system. Overview and detailed explanations are given for the latest LTE standards for radio interface architecture, the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance. Key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of the LTE/LTE-Advanced implementation are given. An overview of other related systems such as GSM/EDGE, HSPA, CDMA2000, and WIMAX is also provided. This book is a 'must-have' resource for engineers and other professionals in the telecommunications industry, working with cellular or wireless broadband technologies, giving an understanding of how to utilize the new technology in order to stay ahead of the competition. The authors of the book all work at Ericsson Research and have been deeply involved in 3G and 4G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of LTE within 3GPP. Includes full details of the latest additions to the LTE Radio Access standards and technologies up to and including 3GPP Release 10Clear explanations of the role of the underlying technologies for LTE, including OFDM and MIMO Full coverage of LTE-Advanced, including LTE carrier aggregation, extended multi-antenna transmission, relaying functionality and heterogeneous deploymentsLTE radio interface architecture, physical layer, access procedures, MBMS, RF characteristics and system performance covered in detail
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01 Jan 2016
TL;DR: Die Leistungsfahigkeit eingebetteter Prozessoren gewinnt in der mobilen Signalverarbeitung aufgrund der stetig steigenden Anforderungen aktueller Multimediaanwendungen immer mehr an Bedeutung.
Abstract: Die Leistungsfahigkeit eingebetteter Prozessoren gewinnt in der mobilen Signalverarbeitung aufgrund der stetig steigenden Anforderungen aktueller Multimediaanwendungen immer mehr an Bedeutung. Da mobile Systeme in den meisten Fallen batteriebetrieben sind, steht zur Ausfuhrung dieser Anwendungen jedoch nur ein stark begrenztes Energiebudget zu Verfugung. Aus diesem Grund muss die Energieeffizienz, die sowohl von der Rechenleistung als auch von der Leistungsaufnahme eines Systems abhangt, so hoch wie moglich sein.
Um diesen Anforderungen gerecht zu werden, verfolgt die Arbeitsgruppe Kognitronik und Sensorik einen CPU-gestutzten Ansatz auf Basis des 32-Bit VLIW-Prozessors CoreVA. Der CoreVA-Prozessor kann zur Entwurfszeit durch eine variable Anzahl parallel angeordneter Verarbeitungs- und Funktionseinheiten erweitert werden. Da sich durch das Hinzufugen der Verarbeitungseinheiten jedoch nicht nur die Rechenleistung des Prozessors sondern auch seine Ressourcenanforderungen erhohen, mussen umfangreiche Entwurfsraumexplorationen durchgefuhrt werden, um diese Wechselwirkungen bewerten zu konnen. Dies ist angesichts der vielschichtigen Konfigurierbarkeit des CoreVA-Prozessors jedoch auserst zeitaufwandig.
Vor diesem Hintergrund wurden in dieser Arbeit verschiedene Verfahren einer modellbasierten Entwurfsraumexploration entwickelt. Die Charakterisierung der Zielanwendungen erfolgt hierbei entweder auf Basis einzelner Simulationsdurchgange des CoreVA-Instruktionssatzsimulators oder durch statische Programmcodeanalysen. Die Ermittlung der Ressourcenanforderungen geschieht mit Hilfe eines Hardwaremodells, das aus wenigen Probesynthesen gewonnen werden kann. Die Energie, die die jeweiligen Prozessorkonfigurationen zur Ausfuhrung der Zielanwendungen benotigen, wird schlieslich durch eine Kombination dieser Modelle bestimmt. Hierbei ergibt sich ein durchschnittlicher Approximationsfehler von etwa -5%.
Aufgrund dieses geringen Fehlers konnen die modellbasierten Verfahren die Entwurfsraumexploration des CoreVA-Prozessors masgeblich beschleunigen. Fur einen Prozessor mit bis zu vier Verarbeitungseinheiten lasst sich die Anzahl der genauer zu untersuchenden Prozessorkonfigurationen von 352 auf weniger als zehn Konfigurationen reduzieren. Bei einem Grosteil der vorgestellten Anwendungen kann die modellbasierte Entwurfsraumexploration die energieeffizientesten Konfigurationen sogar direkt detektieren.
4 citations
18 Nov 2015
TL;DR: This paper investigates possible performance enhancements through the use of LTE-Advanced enhancements, specifically: coordinated multipoint and carrier aggregation (CA), to relax the downlink backhaul capacity bottleneck for self-backhauled LTE-U small cells.
Abstract: The heterogeneous deployment of high-power macro cells and low-power small cells is expected to become the most common approach for operators to meet the increasing demand for capacity in high traffic areas, such as, dense urban hotspots. Furthermore, the recent proposals for operating Long Term Evolution (LTE) networks in the unlicensed spectrum bands (LTE-U) is being considered as an approach for providing additional spectrum for dense small cell deployments. However, the implementation of affordable and flexible small cell backhaul links remains challenging. To that end, self-backhauling the small cells via the existing macro cells as interesting approach, but has limited capacity compared to traditional dedicated backhaul links. In this paper, we investigate possible performance enhancements through the use of LTE-Advanced enhancements, specifically: coordinated multipoint and carrier aggregation (CA), to relax the downlink backhaul capacity bottleneck for self-backhauled LTE-U small cells. We study this proposed approach through system simulations of a selected realistic deployment scenario in a busy area of Addis Ababa. The results of the simulation campaign demonstrate that deployment of self-backhauled LTE-U small cells in dense urban hotspots can provide notable throughput gains, particularly for the case CA enhancements in the small cell backhaul links.
4 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...For LTE 3GPP Release 8 transmission bandwidth scalability is possible up to 20 MHz, while 3GPP Release 10 carrier aggregation enables LTE-UEs and small cell LTE backhaul connections are scheduled over multiple 20 MHz component carriers [19]....
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01 Jan 2012
TL;DR: This thesis investigates the scheduling aspect of using 3GPP Long Term Evolution (LTE) as a radio transport in Wireless Sensor Network (WSN) applications.
Abstract: In this thesis we investigate the scheduling aspect of using 3GPP Long Term Evolution(LTE) as a radio transport in Wireless Sensor Network (WSN) applications.A possible performance bottleneck in LT ...
4 citations
Patent•
31 Jan 2012TL;DR: In this article, a method for requesting a connection setup of a connection between a terminal (302) and a node (304) of a radio access network (300) is described.
Abstract: A method for requesting a connection setup of a connection between a terminal (302) and a node (304) of a radio access network (300) is described. The radio access network (300) supports a first access and a second access of the terminal (302) to the radio access network (300) for the connection. The method is executed by the terminal (302). The method comprises determining (314) whether to at least partially accept a network defined condition of the radio access network (300) associated with the first access, selecting (316), from the first access and the second access, the first access based on a result of the step (314) of determining, and requesting (320a, b), from the node (304), the selected first access for the connection. The method may enable an improved management of a quality of service by the radio access network in association with a connection between a terminal and the radio access network.
4 citations
TL;DR: In order to obtain better target identification performance, an efficient waveform design method with high range resolution and low sidelobe level for targeting accuracy is proposed.
Abstract: In order to obtain better target identification performance, an efficient waveform design method with high range resolution and low sidelobe level for...
4 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...However, a technical issue related to wider band transmission is the increased corruption of the transmitted signal due to time dispersion on the radio channel [4]....
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