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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TL;DR: A novel wake-up scheme is described and studied, to tackle the trade-off between latency and battery lifetime in future 5G networks, seeking thus to facilitate an always-available experience, rather than always-on.
Abstract: Improved mobile device battery lifetime and latency minimization are critical requirements for enhancing the mobile broadband services and user experience. Long-term evolution (LTE) networks have adopted discontinuous reception (DRX) as the baseline solution for prolonged battery lifetime. However, in every DRX cycle, the mobile device baseband processing unit monitors and decodes the control signaling, and thus, all instances without any actual data allocation leads to unnecessary energy consumption. This fact together with the long start-up and power-down times can prevent adopting frequent wake-up instants, which, in turn, leads to considerable latency. In this work, a novel wake-up scheme is described and studied, to tackle the trade-off between latency and battery lifetime in future 5G networks, seeking thus to facilitate an always-available experience, rather than always-on. Analytical and simulation-based results show that the proposed scheme is a promising approach to control the user plane latency and energy consumption, when the device is operating in the power saving mode. The aim of this article is to describe the overall wake-up system operating principle and the associated signaling methods, receiver processing solutions and essential implementation aspects. Additionally, the advantages compared to DRX-based systems are shown and demonstrated, through the analysis of the system energy-efficiency and latency characteristics, with special emphasis on future 5G-grade mobile devices.
8 citations
TL;DR: The experiment reveals that the dual-functional approach can achieve comparable BER performance with pure communication-based solutions while achieving fine sensing beampatterns and realistic sensing functionality simultaneously.
Abstract: The integration of sensing and communication (ISAC) functionalities have recently gained significant research interest as a hardware-, power-, spectrum- and cost- efficient solution. This experimental work implements a dual-functional sensing and communication framework where a single radiation waveform, either omnidirectional or directional, can realize both sensing and communication functions. We design an orthogonal frequency division multiplexing (OFDM) based multi-user multiple input multiple output (MIMO) software-defined radio (SDR) testbed to validate the dual-functional model. We carry out over-the-air experiments to investigate the optimal trade-off factor to balance the performance for both functions. On the communication side, we obtain bit error rate (BER) results from the testbed to show the communication performance using the dual-functional waveform. On the sensing performance, we measure the output beampatterns of our transmission to examine their similarity to simulation based beampatterns. We also implement a sensing experiment to realize activity detection functions. Our experiment reveals that the dual-functional approach can achieve comparable BER performance with pure communication-based solutions while achieving fine sensing beampatterns and realistic sensing functionality simultaneously.
8 citations
01 Sep 2017
TL;DR: It is shown through both link level and system level simulations that in dense urban scenario NOCA-PIC scheme is capable of working in highly overloaded system conditions and can support more than 4 times concurrent random access number compared with OFDM based CB transmission.
Abstract: The fifth generation (5G) wireless network faces unprecedented massive concurrent random access requests in uplink (UL) contention-based (CB) transmission. In this paper, a non-orthogonal coded access (NOCA) UL transmission in combination with parallel interference cancellation (PIC) based reception scheme at base station is investigated. Non-orthonormal code generated by Zadoff-Chu (ZC) sequences is used to spread the data bits over orthogonal frequency division multiple (OFDM) symbols. It is shown through both link level and system level simulations that in dense urban scenario NOCA-PIC scheme is capable of working in highly overloaded system conditions. It can support more than 4 times concurrent random access number compared with OFDM based CB transmission.
8 citations
Cites methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...In LTE system, ZC sequences are used as preamble sequences and uplink reference signal (RS) [7]....
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04 Dec 2014
TL;DR: It is shown that the performance of fiber-optic relaying is superior to that of double-hop relaying and the theoretical desired-to-undesired-signal ratio due to the interference is discussed in terms of the carrier frequency, radio propagation condition, and optical fiber length.
Abstract: This paper presents a new type of fiber-optic relaying that extends the coverage of mobile networks. The antenna facing the evolved Node B is geographically separated from the antenna facing the user equipment, and the two antennas are connected via an optical fiber. We propose a design approach for fiber-optic inband relaying in the presence of self-interference, which is the interference between the backhaul and access links. The theoretical desired-to-undesired-signal ratio due to the interference is discussed in terms of the carrier frequency, radio propagation condition, and optical fiber length. Moreover, we show that the performance of fiber-optic relaying is superior to that of double-hop relaying.
8 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Furthermore, LTE-Advanced technology has been researched, mainly as part of the 3rd Generation Partnership Project (3GPP) and it is a candidate for International Mobile Telecommunication (IMT)-Advanced standard [1]-[3]....
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TL;DR: This paper has improved the network performance with respect to the number of handovers and the handover delay by applying an LTE‐SDN architecture and a novel handover decision algorithm based on predicting the future locations of a moving vehicle.
8 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Increased user demands to be always connected and, from any place, accelerate technology advancements in wireless communiction technologies such as fourth generation (4G) of wireless mobile network technologies1 such as Long-Term Evolution (LTE) and LTE-A.2 The 4G cellular mobile network supports higher data rates and provides many services such as discovering and selecting the best access point at all times to provide a seamless connection....
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...Increased user demands to be always connected and, from any place, accelerate technology advancements in wireless communiction technologies such as fourth generation (4G) of wireless mobile network technologies(1) such as Long-Term Evolution (LTE) and LTE-A.(2) The 4G cellular mobile network supports higher data rates and provides many services such as discovering and selecting the best access point at all times to provide a seamless connection....
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