Book•
3G Evolution : HSPA and LTE for Mobile Broadband
31 Jul 2007-
TL;DR: In this paper, the authors present a very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by threeGPP with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE.
Abstract: This very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by 3GPP, with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE. The 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 HSPA and LTE implementation are given. An overview of other related systems such as TD SCDMA, CDMA2000, and WIMAX is also provided.This is a 'must-have' resource for engineers and other professionals working with cellular or wireless broadband technologies who need to know how to utilize the new technology to stay ahead of the competition.The authors of the book all work at Ericsson Research and are deeply involved in 3G 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 both HSPA and LTE within 3GPP. * Gives the first explanation of the radio access technologies and key international standards for moving to the next stage of 3G evolution: fully operational mobile broadband* Describes the new technologies selected by the 3GPP to realise High Speed Packet Access (HSPA) and Long Term Evolution (LTE) for mobile broadband * Gives both higher-level overviews and detailed explanations of HSPA and LTE as specified by 3GPP
Citations
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01 Jan 2009
TL;DR: A focus in this study is on development of schemes for inter-cell interference avoidance under fractional load conditions, which provide significant improvements in cell throughput and user outage throughput performance.
Abstract: This PhD study aims to investigate techniques for efficient usage of spectrum for next generation mobile communication networks. The Long Term Evolution (LTE) and LTEAdvanced (LTE-A) systems are taken as case studies. The LTE is under development within 3rd Generation Partnership Project (3GPP) and heading towards its final phase of standardization. The LTE aims for reduced latency, higher user data rates, improved system capacity and coverage, and reduced cost for the operators. Currently the International Telecommunications Union (ITU) is working on specifying the system requirements towards next generation mobile communication systems called International Mobile Telecommunications-Advanced (IMT-A). The 3GPP aims to further evolve LTE towards LTE-A in order to meet or exceed the IMT-A requirements as well as its own requirements for advancing LTE for long term competitiveness. The first half of the PhD study is mainly concerned with LTE, with the main focus on higher order sectorization and inter-cell interference avoidance to improve system capacity and coverage. Typically three antennas are considered rendering 3 sector site deployments for LTE. A migration to 6 sector site deployment has been investigated. A mixed network topology composed of a combination of 3 and 6 sectors site deployment is also proposed. The mixed network topology is found to provide significantly high performance gains in terms of cell throughput and user outage throughput performance, and therefore recommended as a potential solution to meet high traffic demands in localized areas such as hot spots. LTE uses Orthogonal Frequency Division Multiple Access (OFDMA) in the downlink with universal frequency reuse. Due to the characteristics of OFDMA, the intra-cell interference is ideally avoided , but the environment still remains interference limited due to the presence of inter-cell interference. Our focus in this study is on development of schemes for inter-cell interference avoidance under fractional load conditions. The fractional load conditions arise when all the resources are not required to be used due to lack of traffic in the cell. We propose several autonomous inter-cell interference avoidance schemes, which do not require inter-cell signaling and provide significant improvements in cell throughput and user outage throughput performance. The second half of the study is concerned with LTE-A, which aims to provide peak data rates in the order of 1 Gbps in downlink and 500 Mbps in uplink for the nomadic local area/indoor deployment scenarios. Such high data rates may require high spectral efficiency and a wide bandwidth spectrum allocation in the order of 100 MHz. Such high bandwidth allocation may require sharing of spectrum among operators in a flexible manner. Currently, Home e-nodeB (HeNB) is emerging as a potential solution to provide high data rate high quality indoor coverage. Potentially large scale uncoordinated deployment of HeNBs, sharing over the same
7 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...It provides simultaneous support for a wide range of services with different characteristics on a common 5 MHz carrier [3]....
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...It introduced a new RAN called UTRAN together with a new air interface called Wideband Code Division Multiple Access (WCDMA) in the first release (Release’99) in 2002 [3]....
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...Once the subcarrier spacing has been selected, the number of subcarriers can be decided based on the assumed overall transmission bandwidth, taking into account acceptable out-of-band emission [3]....
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...WiMAX [13], [3] and DVB broadcast technologies [14]....
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...The 3rd Generation Partnership Project (3GPP) was established in December 1998 with the purpose of producing globally applicable Technical Specifications and Technical Reports for 3rd Generation Mobile System based on evolved GSM core networks [3]....
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17 Jul 2017
TL;DR: This paper explores coarse quantization in the per-antenna digital transmit filters and inverse fast Fourier transforms and evaluates it in terms of performance and complexity savings and concludes that the overall system energy greatly benefits from lousy per-Antenna processing.
Abstract: Massive MIMO (MaMIMO) is a key technology for 5G wireless communication, enabling large increase in both spectral and energy efficiency at the same time. Before it can be deployed, it is important to find efficient implementation strategies. Because of the many antennas, an essential part of decreasing complexity, and further improving energy efficiency, is optimization of the digital signal processing (DSP) in the per-antenna functions. Assuming an orthogonal frequency-division multiplexing (OFDM) based MaMIMO system, this paper explores coarse quantization in the per-antenna digital transmit filters and inverse fast Fourier transforms (IFFTs) and evaluates it in terms of performance and complexity savings. Results show that DSP complexity can be greatly reduced per-antenna, and therefore significant power savings can be achieved, with limited performance degradation. More specifically, when going towards MaMIMO and therefore increasing the number of antennas from 8 to 64, it is possible to reduce the complexity in each transmit filter by 55%. Also, when using 6 bits to represent the input signal and 6 bits for the filter coefficients, this results in an SNR degradation of less than 0.5 dB compared to floating-point performance. Consequently, we conclude that the overall system energy greatly benefits from lousy per-antenna processing.
7 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Similar to 3GPP Long-term Evolution (LTE), the bandwidth is 20MHz and 1200 of 2048 subcarriers are used for data transmission, divided into 100 resource blocks [6]....
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27 Oct 2015
TL;DR: A collaborative approach by multiple operators to share spectrum can be of mutual benefit and the possibility of virtualization to enable every operator to obtain a higher throughput in an LTE network compared to operators working separately is shown.
Abstract: Wireless virtualization has significant potential for improving the efficiency of resource utilization through spectrum sharing However, several challenges exist in enabling/implementing virtualization over the current static cellular infrastructure In the meantime, virtualization necessitates spectrum sharing and a collaborative network management entity that needs to provide efficient isolation strategies that protects multiple operators from suffering interference in shared frequency bands Toward enabling virtualization, we develop a framework based on 3GPP LTE, in which spectrum is reused temporally and spatially by more than one operator The usage of spectrum is adjusted by network parameters and network parameters are configured based on power and radio propagation characteristics In the framework, we minimally modify the radio resource manager (RRM) of LTE into a virtual resource manager Further, the popular LTE enhanced inter-cell interference cancellation (eICIC) - time domain muting is adopted/modified as an isolation technique in a virtual setting Extensive simulations are conducted that show the possibility of virtualization to enable every operator to obtain a higher throughput in an LTE network compared to operators working separately However, the network configuration driven by tradeoffs will have to be carefully considered to ensure isolation In summary, a collaborative approach by multiple operators to share spectrum can be of mutual benefit
7 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...LTE supports two types of frame structures for two different duplexing schemes – frequency division duplex (FDD) and time division duplex (TDD)....
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TL;DR: This study is employing a self-organized particle swarm optimization (PSO)-based joint component carrier selection and scheduling (JCCS) algorithm for the downlink that results in the maximization of the min-max throughput by managing the inter-cell interference in an appropriate manner.
Abstract: In order to meet the high throughput demand set by international mobile telecommunication union, carrier aggregation is exploited for expanding the bandwidth of up to 100 MHz in Long Term Evolution-Advanced (LTE-A). For achieving the aforementioned bandwidth, a maximum of five component carriers (CCs) can be aggregated as per Release 10 LTE-A. Improper CC selection and scheduling will result in hazardous throughput, fairness, and interference problems. Therefore, a proper CC selection and scheduling algorithm is most important for the overall performance of the network. On the other hand, due to an increased information exchange, centralized network planning is not a suitable choice here. In this study, we are employing a self-organized particle swarm optimization (PSO)-based joint component carrier selection and scheduling (JCCS) algorithm for the downlink. More precisely, the concern of the proposed algorithm is the autonomous distribution of resource blocks (RBs) from the pool of CCs by the base station, with the concern of minimizing the impact of inter-cell interference. Our proposed PSO-based JCCS algorithm results in the maximization of the min-max throughput by managing the inter-cell interference in an appropriate manner. Moreover, the proposed algorithm is compared with the traditional CC selection and scheduling algorithms, i.e., random, round robin, and proportional fair. The comparison is carried out in terms of throughput and fairness, and the calculated percentage gain in the end elaborates the performance improvement by exploiting PSO-based JCCS.
7 citations
Dissertation•
14 Jan 2013
TL;DR: In this paper, the authors proposed to densify the macrocellular network by deploying Pico eNodeBs with CRE to enhance system performance and meet future expected demands, and demonstrated that the deployment of Pico nodes with CRE improves system performance.
Abstract: Densifying the Macro-cellular network by deploying Pico eNodeBs with CRE to enhance system performance and meet future expected demands.
7 citations