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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03 Mar 2015
TL;DR: The proposed adaptation takes the effects of the intersymbol and intercarrier interference into account, where the ISI/ICI is modelled as coloured noise, which degrades the SNR and therefore directly affects the feedback parameters.
Abstract: Abstract—In 3GPP LTE communication systems, the physical layer is based on Orthogonal Frequency-Division Multiple Access and Single Carrier Frequency-Division Multiple Access in the downlink and uplink, respectively. For both schemes two different cyclic prefix (CP) lengths are standardized, a normal CP length and an extended version, the latter being intended for high delay spread channels. We retain the simple one tap equalizer and show that appropriate adaptation of the modulation and coding scheme, rather than extending the CP, yields better throughputs in a typical SNR regime of operation. The proposed adaptation takes the effects of the intersymbol (ISI) and intercarrier (ICI) interference into account, where the ISI/ICI is modelled as coloured noise, which degrades the SNR, and therefore directly affects the feedback parameters. Keywords—LTE-A, SC-FDMA, OFDMA , CP length, limited feedback, MBSFN
12 citations
TL;DR: Simulation results show that the proposed analytical framework can be utilized to accurately evaluate the performance of practical cloud-based small cell networks employing clustered cooperation, using the homogenous Poisson point processing model.
Abstract: One major advantage of cloud/centralized radio access network is the ease of implementation of multi-cell coordination mechanisms to improve the system spectrum efficiency (SE). Theoretically, large number of cooperative cells lead to a higher SE; however, it may also cause significant delay due to extra channel state information feedback and joint processing computational needs at the cloud data center, which is likely to result in performance degradation. In order to investigate the delay impact on the throughput gains, we divide the network into multiple clusters of cooperative small cells and formulate a throughput optimization problem. We model various delay factors and the sum-rate of the network as a function of cluster size, treating it as the main optimization variable. For our analysis, we consider both base stations’ as well as users’ geometric locations as random variables for both linear and planar network deployments. The output signal-to-interference-plus-noise ratio and ergodic sum-rate are derived based on the homogenous Poisson point processing model. The sum-rate optimization problem in terms of the cluster size is formulated and solved. Simulation results show that the proposed analytical framework can be utilized to accurately evaluate the performance of practical cloud-based small cell networks employing clustered cooperation.
12 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...3 ms [26], [27]; the channel estimation and RRH processing delay are set to zero since they are not as sizeable factors as the processing or feedback delay....
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TL;DR: The proposed methods efficiently mitigate the interference from FBSs to nearby MUs, providing an excellent macrocell/femtocell throughput tradeoff, while drastically decreasing signaling overhead, compared with conventional methods.
Abstract: We propose a resource allocation method for the downlink of an orthogonal-frequency-division-multiple-access (OFDMA)-based macrocell/femtocell overlaid heterogeneous network. To mitigate the interference caused by femtocell base stations (FBSs) on nearby macrocell users (MUs), conventional methods rely on the information of the interference channel states, as well as MU allocation mapping provided by a control channel, causing a substantial overhead increase. Instead, the proposed methods enable the FBS to predict the subchannels that are likely to be used by its neighbor MUs, based on their locally overheard channel state information, and to set appropriate constraints on those subchannels. Moreover, by letting the FBS fully reuse the subchannels estimated to be free from nearby MUs, the femtocell throughput is increased while scarcely degrading the macrocell throughput. The simulation results demonstrate the validity of our analysis for MUs' allocation estimation error probability and threshold optimization. Moreover, the proposed methods efficiently mitigate the interference from FBSs to nearby MUs, providing an excellent macrocell/femtocell throughput tradeoff, while drastically decreasing signaling overhead, compared with conventional methods.
12 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Furthermore, note that SNR estimation will be further enhanced in Release 11 due to the CSI interference measurement (IM) reports that provide an accurate estimation of the interference-plus-noise level [33]....
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TL;DR: This work forms a centralized downlink multi-cell joint resource and power allocation problem, and proposes a non-cooperative downlink power allocation approach based on game theory that aims to maximize system throughput while guaranteeing throughput fairness between UEs.
12 citations
22 May 2016
TL;DR: By quantifying the performance in terms of effective capacity, this paper introduces a lower bound for the system performance that facilitates an efficient analysis and gives insights about the possible improvement of the statistical QoS experienced by the users if the current heterogeneous cellular network architecture migrates from a Half Duplex to a Full Duplex mode of operation.
Abstract: In this paper, statistical Quality of Service provisioning in next generation heterogeneous mobile cellular networks is investigated. To this aim, any active entity of the cellular network is regarded as a queuing system, whose statistical QoS requirements depend on the specific application. In this context, by quantifying the performance in terms of effective capacity, we introduce a lower bound for the system performance that facilitates an efficient analysis. We exploit this analytical framework to give insights about the possible improvement of the statistical QoS experienced by the users if the current heterogeneous cellular network architecture migrates from a Half Duplex to a Full Duplex mode of operation. Numerical results and analysis are provided, where the network is modeled as a Matern point processes with a hard core distance. The results demonstrate the accuracy and computational efficiency of the proposed scheme, especially in large scale wireless systems.
12 citations
Cites methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...5 ms wide RBs to a UE based on the Buffer Status Report (BSR) and Channel State Information (CSI) obtained by measuring the reference signals in both time and frequency [14]....
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