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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Patent•
31 Mar 2016TL;DR: In this article, a user equipment (UE) may be configured with a carrier aggregation (CA) configuration, which may include a large number of component carriers (CCs), and some of the CCs may be designated as basis CCs, and may have a flexible control channel configuration, while other CAs may be classified as supplemental CCs with a restricted control channel.
Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may be configured with a carrier aggregation (CA) configuration, which may include a large number of component carriers (CCs). Some of the CCs may be designated as basis CCs, and may have a flexible control channel configuration, while other CCs may be designated as supplemental CCs with a restricted control channel configuration. The restricted control channels may have a reduced number of decoding candidates, which may reduce the complexity and increase the likelihood of successfully decoding the control channels. For example, the restricted control channels may be limited to a subset of aggregation levels, a reduced control region, or other restrictions. In some cases, the CCs may be grouped into basis CCs and supplemental CCs based on physical uplink control channel (PUCCH) groups or based on CCs that utilize enhanced physical downlink control channels (ePDCCH).
9 citations
TL;DR: In this paper, the authors considered both challenges in HetNets comprising large size, high power base station (LHB) and relay operating in the µ$ wave band and small size, low power base stations (SLB) and device-to-device (D2D) operating in millimeter wave (mmWave) band.
Abstract: Beyond fifth-generation (5G) heterogeneous networks (HetNets) are facing the challenge of accommodating enormous mobile users and data traffic with scarce spectrum resources in the microWave ( $\mu $ Wave) band. In this work, we consider both challenges in HetNets comprising large size, high power base station (LHB) and relay operating in $\mu $ Wave band and small size, low power base station (SLB) and device-to-device (D2D) operating in millimeter wave (mmWave) band. We formulate user association optimization problems to pitch user association schemes based on downlink uplink decoupled (DU-DPL) access against traditional downlink uplink coupled (DU-CPL) access in HetNets to gauge the performance of these access schemes in terms of accommodating users and spectrum efficiency in $\mu $ Wave and mmWave bands. Formulated problems are non-deterministic polynomial-time hard (NP-hard) and solved using $\epsilon $ -optimal algorithm. Simulation results show the edge of DU-DPL access over DU-CPL access in terms of users association and spectrum efficiency.
9 citations
01 Jan 2012
TL;DR: One feature of LTE-A is the use ofheterogeneous networks (HetNets) which consist of macro-cells and low power nodes (LPNs), one of the objectives of this trial was to demonstrate the versatility of the HetNet architecture.
Abstract: LTE-A is the latest cellular network technology. One feature of LTE-A is the use ofheterogeneous networks (HetNets) which consist of macro-cells and low power nodes(LPNs). One of the objectives of ...
9 citations
02 Jun 2014
TL;DR: This paper considers a resource allocation problem that concurrently utilizes unicast/multicast in order to support many more mobile streaming users and minimize the energy consumption of the battery-powered mobile devices and presents an optimal algorithm, SCOPT, for this problem.
Abstract: Mobile on-demand videos are getting tremendously popular and incurring staggering overhead on cellular net-works. Fortunately, next generation cellular networks support video streaming over either unicast or multicast, but how to capitalize both unicast and multicast for optimal on-demand video streaming remains an open question. In this paper, we consider a resource allocation problem that concurrently utilizes unicast/multicast in order to support many more mobile streaming users and minimize the energy consumption of the battery-powered mobile devices. We formulate this problem as a Binary Integer Programming (BIP) problem. We present an optimal algorithm, SCOPT, for this problem. We also develop an efficient heuristic algorithm, SCG, for lower overhead. We conduct detailed packet-level simulations to evaluate the algorithms in LTE networks using OPNET. Our simulation study shows that the proposed algorithms: (i) result in lower energy consumption than multicast-only approach, (ii) scale to many more mobile users than unicast-only approach, and (iii) are more energy efficient with more network bandwidth or fewer videos. In addition, we discuss how our solution can be extended to support Single Frequency Networks in which multiple adjacent base stations operate on the same frequency.
9 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...If a shorter service delay is required, patching techniques [20], [21], [22] can be adopted....
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01 Nov 2014
TL;DR: In this paper, the authors used the Standard Propagation Model (SPM) as a path loss prediction model to analyze propagation characteristics of Managua city in order to implement coverage in a 3G-WCDMA network.
Abstract: In this paper, we use the Standard Propagation Model (SPM), as a path loss prediction model to analyze propagation characteristics of Managua city in order to implement coverage in a 3G-WCDMA network. SPM is integral part of propagation model used in today's radio network planning tools like ATOLL®. This contribution describes how the SPM can be calibrated and applied as a propagation model that can be used by a mobile network operator for the daily radio planning process in a certain area. For this purpose, we performed a drive test (DT) measurement campaign. The performance of the model at 850 MHz is analyzed by comparing the predictions with the results from the measurement campaign at five representative sites in the city of Managua. Our results show that, overall along the test route, the capacity performances are dictated by the power of the communication links. Finally, this work could be used to identify coverage problems and improve it in a given area.
9 citations