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4G: LTE/LTE-Advanced for Mobile Broadband

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
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Journal ArticleDOI
TL;DR: A low-complexity joint scheme, which simultaneously selects multiple relays and users for cooperation as well as assigns the selected users to different selected relays for service, is proposed for non-regenerative and altruistic relays.
Abstract: In this work, we study joint user-relay selection and association in multi-user multi-relay cooperative wireless relay uplinks with multi-antenna nodes. For non-regenerative and altruistic relays we propose a low-complexity joint scheme, which simultaneously selects multiple relays and users for cooperation as well as assigns the selected users to different selected relays for service. The proposed scheme is sub-optimal and utilizes only the channel gains between the nodes, which leads to reduced feedback and overhead in comparison to schemes that require full channel knowledge. Furthermore, the complexity of the scheme scales linearly as the product of the total number of relays, the total number of users and the number of selected users. Simulation results demonstrate the superiority of the proposed joint scheme compared to a scheme with neither user-relay selection nor user-relay association and another scheme with user-relay association, but no user-relay selection. The favorable performance and low-complexity of the proposed scheme make it very attractive for possible implementation in emerging broadband wireless relay networks (e.g., LTE-Advanced).

17 citations


Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."

  • ...Although prone to noise and interference enhancement, amplify-and-forward (AF) relays are simpler, hence more attractive than decode-and-forward (DF) ones [1], [2]....

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  • ...However, transceiver nodes are envisaged to have multiple antennas in the emerging wireless broadband networks [2]....

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Proceedings ArticleDOI
08 Jun 2015
TL;DR: This paper presents a secure beamforming design to prevent eavesdropping on multiple-input multiple-output (MIMO) device-to-device (D2D) communication, and discusses the convergence of the proposed algorithms, impact of the number of eavesdropper on the performance, and the SINR distributions at eavesdroppers.
Abstract: This paper presents a secure beamforming design to prevent eavesdropping on multiple-input multiple-output (MIMO) device-to-device (D2D) communication. The devices communicate via a trusted relay which performs physical layer network coding (PNC), and multiple eavesdroppers are trying to intercept the device information. The beamforming design is based on minimizing mean square error of the D2D communication while employing signal-to-interference-plus-noise ratio (SINR) threshold constraints to prevent possible eavesdropping. The channel state information of the device-to-eavesdropper and relay-to-eavesdropper channels is imperfect at the devices and relay. The channel estimation errors are assumed with Gaussian Markov uncertainty model. Consequently, robust optimization problems are formulated considering the multiple access and broadcasting stages of the D2D communication. These problems are non-convex, and two algorithms are proposed to solve them. In the numerical analysis, we discuss the convergence of the proposed algorithms, impact of the number of eavesdroppers on the performance, and the SINR distributions at eavesdroppers.

17 citations


Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."

  • ...Ongoing Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) [4] has also identified D2D communication as a potential technique to increase the spectral efficiency, enhance the end-user experience and improve the energy efficiency....

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Patent
13 May 2013
TL;DR: In this article, a method and a system for channel state information (CSI) reporting in LTE networks is presented, which comprises, a user equipment (UE) transmitting to a LTE cellular base station (eNodeB) a CSI report containing more accurate information than that achievable with CQI, PMI and Rl indicators on an uplink radio channel in a periodic manner using a physical uplink shared channel (PUSCH), said CSI reporting being activated based on a mobility estimation of said UE, said mobility estimation being performed by said eNodeB.
Abstract: A method and a system for channel state information (CSI) reporting in LTE networks. The method comprises, a user equipment (UE) transmitting to a LTE cellular base station (eNodeB) a CSI report containing more accurate information than that achievable with CQI, PMI and Rl indicators on an uplink radio channel in a periodic manner using a physical uplink shared channel (PUSCH), said CSI reporting being activated based on a mobility estimation of said UE, said mobility estimation being performed by said eNodeB. The system is adapted to implement the method.

17 citations

Proceedings ArticleDOI
17 Dec 2015
TL;DR: A novel concept of enhanced evolved Node B (e2NB) is presented to enable meshing of the neighboring e2NBs and maintain the LTE-compliant communication service with the legacy terminals reusing the LTE air interface while moving.
Abstract: It has been recognized that effective communications and the ability to share various media are keys to a successful operation in public safety and military applications. LTE (Long Term Evolution) is becoming the most widely deployed broadband communication technology making it the technology of choice for public safety to replace TETRA and similar networks. However, LTE is a cellular network by design in that it has planned and fixed antenna locations, and is connected to a common packet core network. Even though the LTE self-organized operation makes the planning, configuration, management, optimization and healing of the network simpler and faster, LTE networks are not well-suited for the moving cell, particularly to establish the backhaul link among the base stations. In this paper we present a novel concept of enhanced evolved Node B (e2NB) to enable meshing of the neighboring e2NBs and maintain the LTE-compliant communication service with the legacy terminals reusing the LTE air interface while moving. We evaluate the performance of the e2NB in terms of backhaul link performance and end-to-end communication using the OpenAirInterface (OAI) LTE implementation. Emulation results demonstrate the feasibility of the proposed approach to build a self-organized mesh network over LTE/LTE-A. They also show that LTE quality-of-service requirements can be maintained in multi-hop networks subject to resource allocation across multiple e2NBs.

17 citations


Additional excerpts

  • ...In such a case, the corresponding UL HARQ process needs to be postponed by transmitting an ACK on the PHICH, irrespective of the outcome of the decoding [12]....

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Journal ArticleDOI
TL;DR: This paper considers an approach for simultaneous multipacket channel estimation and reception (SMuCER) with a multicarrier system under frequency-selective fading, where the channel estimation becomes challenging due to frequency- selective fading and different round-trip delay between the devices.
Abstract: In random access for machine-type communications, it is required not only to detect active devices, but also to estimate their channel state information when they transmit preambles. In this paper, we consider an approach for simultaneous multipacket channel estimation and reception (SMuCER) with a multicarrier system under frequency-selective fading, where the channel estimation becomes challenging due to frequency-selective fading and different round-trip delay between the devices. In the proposed approach, circular-shifted preambles are used to effectively increase the number of preambles (that can lower the probability of preamble collision), and compressive sensing (CS)-based multiuser detection (MUD) is employed. In order to have a good performance of CS-based MUD for SMuCER, we consider Alltop sequences. Furthermore, we formulate an optimization problem to maximize the number of successfully recovered active devices, where a large single system is to be divided into multiple subsystems. It is shown that multiple subsystems have not only a higher throughput, but also a lower computational complexity than a large single system.

17 citations