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
Citations
More filters
08 Jan 2015
TL;DR: In this paper, a review of radio resource management technologies that can be used or proposed for OFDMA-based IMT-Advanced system is provided, where power control, handover, packet scheduling, resource allocation and load and admission control are needed to be controlled to maximize the performance efficiency in the wireless networks.
Abstract: This paper provides a review of radio resource management technologies that can be used or proposed for OFDMA-based IMT-Advanced system. IMT-Advanced specifications significantly enhanced the existing IMT 2000 standard which are represented by LTE-Advanced and mobile WiMAX as the main successful candidates. One of the key components for OFDMA is Radio Resource Management (RRM) which is used to manage radio resources for the air interface in a cellular network. The main purpose of RRM is to utilize the available radio resources efficiently. The RRM tools such as power control, handover, packet scheduling, resource allocation and, load and admission control are needed to be controlled to maximize the performance efficiency in the wireless networks. By controlling these RRM tools, we are able to maximize the number of users in the network and let the users experience the best Quality of Service (QoS) and throughput.
8 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...During the DL, the BS traffic is expected to be very busy as compared to UL traffic, and relay packets are necessarily needed as soon as possible to solve the problem of buffer overflows and ensure latency requirements [23]....
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TL;DR: The conditions for interference-free one-tap equalization and corresponding signal model in the frequency domain for the UFMC system are proposed and the proposed equalization algorithms can significantly improve the BER performance.
Abstract: Universal filtered multi-carrier (UFMC) systems offer a flexibility of filtering arbitrary number of subcarriers to suppress out of band (OoB) emission, while keeping the orthogonality between subcarriers and robustness to transceiver imperfections. Such properties enable it as a promising candidate waveform for Internet of Things (IoT) communications. However, subband filtering may affect system performance and capacity in a number of ways. In this paper, we first propose the conditions for interference-free one-tap equalization and corresponding signal model in the frequency domain for UFMC system. The impact of subband filtering on the system performance is analyzed in terms of average signal-to-noise ratio (SNR), capacity and bit error rate (BER) and compared with the orthogonal frequency division multiplexing (OFDM) system. This is followed by filter length selection strategies to provide guidelines for system design. Next, by taking carrier frequency offset (CFO), timing offset (TO), insufficient guard interval between symbols and filter tail cutting (TC) into consideration, an analytical system model is established. In addition, a set of optimization criteria in terms of filter length and guard interval/filter TC length subject to various constraints is formulated to maximize the system capacity. Numerical results show that the analytical and corresponding optimal approaches match the simulation results, and the proposed equalization algorithms can significantly improve the BER performance.
8 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...This is due to the reason that ETU channel is more frequency selective than EPA channel, which may result in a high possibility to have significantly larger SINR in some subcarriers than EPA channel....
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...We assume that the channel vector hk(t) has the following property [6], [7]:...
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...To simplify the analysis, we will use the same channel (ETU channel for all cases) and values of CFO and TO for all of the three users....
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..., ease in the implementation of multiantenna techniques low complexity and effective one-tap channel equalization [6], [7], but offers significantly lower out-ofband (OoB) emission than OFDM system [1], [2], [3], leading to improved spectrum efficiency....
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...According to the system capacity calculation method in (26), the SINR in these subcarriers can increase ∑N−1 n=0 log2[1+SINR(n)], also notice that they have the same optimal overhead NL3 , which leads to the ETU channel outperforming EPA channel....
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25 Sep 2014
TL;DR: This paper investigates sector search, which is a part of the cell identifier, as well as timing synchronization based on the standardized Primary Synchronization Signal (PSS) generated from known Zadoff-Chu sequences, which provides satisfactory performance in terms of time estimation accuracy and successful sector identification rate.
Abstract: In 3GPP Long Term Evolution (LTE) system, cell search must be first performed to allow the connection between the user equipment and the serving cell. In this paper, we investigate sector search, which is a part of the cell identifier, as well as timing synchronization based on the standardized Primary Synchronization Signal (PSS) generated from known Zadoff-Chu sequences. To this aim, an initial reduced complexity metric is first calculated to provide a coarse PSS start estimate. Then, to determine the sector identifier and fine tune the PSS start estimate, the received signal is cross-correlated to the known PSS candidates. The fine metric, which exhibits high sharp peak, allows detecting the PSS start and the sector identification. Unlike the conventional methods that perform the cross-correlation over all demodulated OFDM symbols, the proposed one carries it over a short interval centered on the coarse estimate, which greatly reduces the complexity. Simulation results show that the proposed approach provides satisfactory performance in terms of time estimation accuracy and successful sector identification rate. For practical SNR values, it also outperforms the considered benchmarks in the frame of LTE systems primary synchronization.
8 citations
Cites methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Two structures are supported; namely Frequency Division Duplex (FDD) mode and Time Division Duplex (TDD) mode [8]....
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...As shown in figure 1, the PSS is multiplexed into the last OFDM symbol in slots 0 and 10 within one radio frame [8]....
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Patent•
14 Aug 2012
TL;DR: In this article, a plurality of non-over-apping regions of resource elements (REs) are defined and each region is associated with one or multiple unique reference symbols (RSs) and may be further associated with multiple antenna ports.
Abstract: Devices and methods for transmitting information in resource blocks between a base station and one or more communication devices are disclosed. In each resource block (RB) used for a data or control channel transmission, a plurality of non-over!apping regions of resource elements (REs) are defined. Each region is associated with one or multiple unique reference symbols (RSs), and may be further associated with one or more antenna ports. When user equipment (UE) demodulates the information it receives in a particuiar region of an RB, it uses the RS and/or antenna port associated with that region. The RS and/or antenna port information may be used, for example, to estimate a channel of the communication network or to demodulate and decode the data contained within the associated regions.
8 citations
TL;DR: A unified utility-based analytical framework for the optimal connection management of mMTC in 5G networks is proposed, where the signaling overhead for connection establishment, access delay, and the connection resource utilization ratio are included.
Abstract: The massive machine-type communications (mMTC) is one of the three generic services for 5G. With the connection-based random access (CBRA) scheme, each machine-type device (MTD) establishes a connection with the base station (BS) prior to its data transmission. Due to the explosive growth of the number of MTDs, many MTDs would establish connections with the BS, which necessitates the study on how to efficiently manage the massive connections with MTDs. To address this issue, in this article, we propose a unified utility-based analytical framework for the optimal connection management of mMTC in 5G networks, where the signaling overhead for connection establishment, access delay, and the connection resource utilization ratio is included. Specifically, we first derive key performance metrics, i.e., the mean time length of each connection and resource utilization ratio, as functions of traffic input rate and inactivity timer. By further considering the signaling overheads and access delay of each MTD, the network utility is formulated and maximized by optimally choosing the inactivity timer. We then present a detailed discussion on the effect of system parameters on the optimal inactivity timer and the corresponding maximum network utility. Finally, we extend the analytical framework to the scenario in which the CBRA scheme coexists with the packet-based random access scheme, i.e., transmitting packets in the random access channel without connection establishment. The critical threshold in terms of the traffic input rate is characterized, which sheds important light on the access scheme selection issue.
8 citations