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
TL;DR: This work investigates the general K-user MIMO IC in a heterogeneous (linear and widely linear) transmitter deployment and addresses the maximization of the weighted sum-rate (WSR) for (widely) linear transmit filters design through the use of the complex-valued formulation.
Abstract: Recent results have shown the benefits of widely linear precoding (WLP) in the MIMO interference channel (MIMO IC) assuming that all transmitters can follow the same strategy. Motivated by a transitional scenario where legacy linear transmitters coexist with widely linear ones, this work investigates the general $K$ -user MIMO IC in a heterogeneous (linear and widely linear) transmitter deployment. In particular, we address the maximization of the weighted sum-rate (WSR) for (widely) linear transmit filters design through the use of the complex-valued formulation. Since the maximum WSR problem is non-convex, and thus difficult to be solved, we formulate an equivalent minimum weighted mean square error problem that allows deriving closed-form expressions for (widely) linear transceivers. Then an iterative procedure is proposed, which is proven to reach a stationary point of the maximum WSR problem. Simulations show that the proposed procedure allows increasing the sum-rate as compared to coordinated linear transceiver schemes. The gains are larger and significant in two different nonexclusive conditions: as the interference level increases or when the number of antennas is low.
51 citations
Patent•
17 May 2012TL;DR: In this paper, a mobile station (200A) extracts non-orthogonal signals addressed to the mobile station by receiving reference signals used in interference cancellation and demodulating and cancelling wireless messages addressed to other mobile stations among the received nonorthogonous signals.
Abstract: Provided are a reception device, a transmission device, and a wireless communications method that are capable of utilizing non-orthogonal multi-access while suppressing both cost increases and processing delays. A mobile station (200A) extracts non-orthogonal signals addressed to the mobile station (200A) by receiving reference signals used in interference cancellation as well as receiving non-orthogonal signals, and demodulating and cancelling wireless signals addressed to other mobile stations among the received non-orthogonal signals. In addition, the mobile station (200A) demodulates extracted non-orthogonal signals addressed to the mobile station (200A), on the basis of the reference signals. The reference signals are multiplexed into the same wireless resource block as the wireless resource block allocated to non-orthogonal signals and, in addition, are multiplexed into the wireless resource block only when at least one signal is scheduled for the wireless resource block.
51 citations
TL;DR: This study has demonstrated that by decoupling the C/U planes, the network performance is greatly enhanced, leading to a more effective way to provide high speed communications for railway systems.
Abstract: Current implementations of narrowband Global System for Mobile Communications for railway systems are facing significant challenges in meeting the emerging massive capacity demands of passenger services. To extend the capacity, this article presents a control and data signaling decoupled architecture, namely, C/U-plane decoupled architecture for railway wireless networks, in which the relatively important C-plane of passenger services is kept on high-quality lower frequency bands to handle mobility, while the corresponding U-plane is moved to higher frequency bands to gain broader spectra. In this railway wireless network with C/U-plane decoupled architecture, the U-plane and C-plane handovers are also physically decoupled. To achieve the seamless and soft U-plane handover, we introduce a handover scheme based on coordinated multi-point transmission and reception and bi-casting. In addition, channel mappings and physical layer frames are redesigned to facilitate the design. Our study has demonstrated that by decoupling the C/U planes, the network performance is greatly enhanced, leading to a more effective way to provide high speed communications for railway systems.
50 citations
Cites background or methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...A logical channel is defined by the type of information it carries and classified as control channel or traffic channel, which includes [14]: • PCCH (paging control channel), used for paging....
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...In LTE networks, one PHICH can be shared by eight users in the case of normal CP (cyclic prefix) and FDD (frequency division duplex) [14]....
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Patent•
14 Sep 2011
TL;DR: In this article, non-linear or linear precoding is used to create separate areas of coherence to different users and limited feedback techniques are employed to send channel state information (CSI) from the plurality of users to the MU-MAS.
Abstract: Non-linear or linear precoding is used to create separate areas of coherence to different users. Limited feedback techniques may also be employed to send channel state information (CSI) from the plurality of users to the MU-MAS. In some embodiments, a codebook is built based on basis functions that span the radiated field of a transmit array. Additionally, the precoding may be continuously updated to create non-interfering areas of coherence to the users as the wireless channel changes due to Doppler effect. Moreover, the size of the areas of coherence may be dynamically adjusted depending on the distribution of users.
50 citations
Patent•
09 Mar 2016TL;DR: In this article, a wireless device receives a first data transmission from a base station in a first subframe interval and transmits HARQ feedback and/or CSI from the wireless device in a subsequent sub-frame interval, within a duration that is less than a maximum transmission duration.
Abstract: In one aspect, a wireless device receives a first data transmission from a base station in a first subframe interval and transmits HARQ feedback and/or CSI to the base station in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval. In another aspect, a base station transmits a first data transmission to a wireless device in a first subframe interval and receives HARQ feedback and/or CSI from the wireless device in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval.
50 citations