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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: This paper presents a framework for selecting which communications should use the D1D mode, and when, and allocating resources to D2D and non-D2D users, exploiting reuse for the former by proposing a heuristic solution to the second.
Abstract: Network-controlled device-to-device (D2D) communication allows cellular users to communicate directly, i.e., without passing through the eNodeB, while the latter retains control over resource allocation. This allows the same time---frequency resources to be allocated to spatially separated D2D flows simultaneously, thus increasing the cell throughput. This paper presents a framework for: (1) selecting which communications should use the D2D mode, and when, and (2) allocating resources to D2D and non-D2D users, exploiting reuse for the former. We show that the two problems, although apparently similar, should be kept separate and solved at different timescales in order to avoid problems, such as excessive packet loss. We model both as optimization problems, and propose a heuristic solution to the second, which must be solved at millisecond timescales. Simulation results show that our framework is practically viable, it avoids the problem of packet losses, increases throughput and reduces delays.

25 citations


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

  • ...RLC PDUs are then encapsulated into MAC PDUs: each of them contains the information being sent over the physical layer, and is called Transmission Block (TB) [17]....

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Patent
Jinmin Kim1, Seung Hee Han1, Hyukmin Son1, Hyun Woo Lee1, Hyeyoung Choi1 
13 Jul 2012
TL;DR: In this paper, the authors proposed a method of adjusting transmission timing for at least one TA group in a wireless access system for supporting carrier aggregation (CA), which includes receiving, by a terminal, a physical downlink control channel (PDCCH) signal including a reserved bit indicating a TA group indicator.
Abstract: The present invention relates to methods of allocating a Timing Advance (TA) value used for at least one timing advance group in a wireless access system for supporting carrier aggregation (CA), methods of adjusting a wireless frame transmission time by using the TA value, and devices for supporting same. According to one embodiment of the present invention, a method of adjusting transmission timing for at least one TA group in a wireless access system for supporting CA includes: receiving, by a terminal, a physical downlink control channel (PDCCH) signal including a reserved bit (i.e. a TA group indicator) indicating at least one TA group; receiving a medium access control (MAC) message including at least one TA value corresponding to at least one TA group; and transmitting an uplink signal by applying a TA value corresponding to a TA group in the TA group that the reserved bit indicates. At this point, each of the at least one TA group may include at least one primary cell (i.e. a P cell).

25 citations

Journal ArticleDOI
TL;DR: An improved version (including some new improvements) of the GIA with respect to the degrees of freedom (DoF) and optimal linear transceiver design is provided, which allows for low-complexity and distributed implementation.
Abstract: Interference alignment (IA) is a promising technique to efficiently mitigate interference and to enhance the capacity of a wireless communication network. This paper proposes a grouping-based interference alignment (GIA) with optimized IA-Cell assignment for the multiple cells interfering multiple-input multiple-output (MIMO) multiple access channel (MAC) network under limited feedback. This work consists of three main parts: 1) an improved version (including some new improvements) of the GIA with respect to the degrees of freedom (DoF) and optimal linear transceiver design is provided, which allows for low-complexity and distributed implementation; 2) based on the GIA, the concept of IA-Cell assignment is introduced. Three IA-Cell assignment algorithms are proposed with different backhaul overhead and their DoF and rate performance is investigated; 3) the performance of the proposed GIA algorithms is studied under limited feedback of IA precoders. To enable efficient feedback, a dynamic feedback bit allocation (DBA) problem is formulated and solved in closed-form. The practical implementation, the backhaul overhead requirements, and the complexity of the proposed algorithms are analyzed. Numerical results show that our proposed algorithms greatly outperform the traditional GIA under both unlimited and limited feedback.

25 citations

Journal ArticleDOI
TL;DR: Theoretical analysis and simulation results demonstrate that URF can exactly highlight the effects of C-plane on the entire transmission process and it is more appropriate to employ URF as the indicator to evaluate the transmission reliability of C/U-plane decoupled architecture.
Abstract: To facilitate the mobility of heterogeneous networks, control plane (C-plane) and user plane (U-plane) decoupled architecture is being considered by the fifth generation (5G) wireless communication network, in which relatively crucial C-plane is expanded and kept at dependable lower frequency bands to guarantee transmission reliability and the corresponding U-plane is moved to available higher frequency bands to boost capacity. Moreover, we apply this architecture to future professional high-speed railway wireless communication system to fulfill the wireless access desire of train passengers. However, for such emerging architecture, there still exist many problems to be solved to guarantee the reliable transmission. In this article, the problem of how to appropriately evaluate the transmission reliability of C/U-plane decoupled architecture is investigated. Due to the lack of ability to reflect the importance of C-plane, conventional outage probability cannot properly indicate the transmission reliability of C/U-plane decoupled architecture whose primary design consideration is that C-plane more heavily affects the transmission reliability thereby being kept at dependable lower frequency bands. Based on this, a novel indicator named unreliability factor (URF) is proposed. Theoretical analysis and simulation results demonstrate that URF can exactly highlight the effects of C-plane on the entire transmission process. Hence, it is more appropriate to employ URF as the indicator to evaluate the transmission reliability of C/U-plane decoupled architecture.

25 citations


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

  • ...In LTE network, C-plane is responsible for essential control operations such as broadcasting system information, network attaches, paging ,and mobility management [8]....

    [...]

Patent
02 Aug 2013
TL;DR: In this paper, a wireless device estimates one or more large-scale channel properties for an antenna port of interest in the downlink control channel based on a subset of reference signals that correspond to antenna ports in the cellular communications network that are quasi co-located with the antenna ports of interest with respect to the estimated channel properties.
Abstract: Systems and methods are disclosed for estimating one or more channel properties of a downlink from a cellular communications network based on quasi co-located antenna ports with respect to the one or more channel properties. In one embodiment, a wireless device receives a downlink subframe including a downlink control channel from the cellular communications network. The wireless device estimates one or more large-scale channel properties for an antenna port of interest in the downlink control channel based on a subset of reference signals that correspond to antenna ports in the cellular communications network that are quasi co-located with the antenna port of interest with respect to the one or more large-scale channel properties. As a result of using the quasi co-located antenna ports, estimation of the one or more large-scale channel properties is substantially improved.

25 citations