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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28 Sep 2009
TL;DR: Enhanced coarse and fine frequency synchronization methods which can estimate more accurately in low SNR and high speed channel environments and has stable operation for TDD frame structure are proposed.
Abstract: In this paper, we propose a coarse and fine frequency synchronization method which is suitable for the 3rd Generation Partnership Project (3GPP) long term evolution (LTE) orthogonal frequency division multiple access (OFDMA) system in time division duplexing (TDD) mode. In general, primary synchronization signal (PSS) correlation based estimation method and cyclic prefix (CP) correlation based tracking loop are applied for coarse and fine frequency synchronization in 3GPP LTE OFDMA system, respectively. However, the conventional coarse frequency synchronization method has performance degradation caused by fading channel and signal to noise ratio (SNR) loss. Also, the conventional fine frequency synchronization method cannot guarantee stable operation in TDD mode because there is no signal in uplink subframe. Therefore, in this paper, we propose enhanced coarse and fine frequency synchronization methods which can estimate more accurately in low SNR and high speed channel environments and has stable operation for TDD frame structure, respectively. By computer simulation, we show that the proposed methods outperform the conventional methods, and verify that the proposed frequency synchronization method can guarantee stable operation in 3GPP LTE OFDMA system in TDD mode.
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...LTE supports both frequency division duplexing (FDD) and TDD, as well as a wide range of system bandwidths in order to operate in a large number of different spectrum allocations....
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TL;DR: Interference mitigation schemes for LTE downlink networks are investigated and can restrict overall system performance in terms of throughput and spectral efficiency, especially for the users located at the cell edge area.
Abstract: Two major challenges for evolving LTE (Long Term Evolution) networks are to achieve enhanced system capacity and cell coverage compared with WCDMA (Wideband Code Division Multiple Access) system. Effective utilization of radio resources as well as dense spectrum reuse are at the core to attain these targets. However, dense frequency reuse may increase inter-cell interference, which in turn severely limits the capacity of users in the system. Inter-cell interference can restrict overall system performance in terms of throughput and spectral efficiency, especially for the users located at the cell edge area. Hence, careful management of inter-cell interferences becomes crucial to improve LTE system performance. In this paper, interference mitigation schemes for LTE downlink networks are investigated.
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...So, careful management of inter-cell interference is very important in LTE to improve system performance [3, 4]....
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...INTRODUCTION The growing demand of providing ubiquitous broadband internet access on mobile networks has imposed the need of developing OFDMA (Orthogonal Frequency Division Multiple Access) based wireless cellular networks such as 4G networks....
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...In cellular mobile communication system, mainly two types of interference must be taken into consideration such as intra-cell interference and inter-cell interference....
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11 Apr 2016
TL;DR: The study proposes a new way of wave form design procedure that considers the multidimensional grid, which is essential for exploiting the opportunities in spatial domain effectively and the waveform design criteria for various applications and frequency bands are presented.
Abstract: Various emerging applications in future wireless networks require rethinking the access techniques not only from the capacity perspective but also satisfying a wide variety of requirements under the same framework. Traditional Orthogonal Frequency Division Multiplexing (OFDM)-based schemes still suffer from some limitations that stand in front of their existence in future technologies. The main goal of this study is to pave the way towards rethinking the waveform design by providing the main components of a wireless communication system. The concept of the multidimensional lattice is introduced, exploiting the angular dimension that opens a new horizon in research for 5G technology and beyond. The study proposes a new way of waveform design procedure that considers the multidimensional grid, which is essential for exploiting the opportunities in spatial domain effectively. In addition, the waveform design criteria for various applications and frequency bands are presented.
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...While OFDM systems in 4G networks support guarding against timing misalignment up to the duration of CP [5], it reveals a low performance beyond CP....
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...Multiple antenna technologies have been an integral part of current wireless communications systems [5]....
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Journal Article•
TL;DR: In this algorithm, the handoff decision problem is formulated as a non cooperative game between the mobile users and the wireless networks that are available in the vicinity of the mobile user.
Abstract: Vertical Handoff Decision Making problem is one of the significant technical issues in the development of Heterogeneous wireless networks. This paper presents a vertical handoff decision algorithm based on game theory approach. In this algorithm, the handoff decision problem is formulated as a non cooperative game between the mobile users and the wireless networks that are available in the vicinity of the mobile user. It considers terminal parameters such as QOS requirements of the mobile application along with the velocity of the mobile terminal. It also considers network parameters such as available bandwidth and cost per bit offered by each network. The algorithm chooses the target network with maximum network utilization that offers services at lower prices. General Terms Heterogeneous Wireless Networks, Game Theory
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...With this interoperability, mobile users carrying mobile terminals equipped with multiple interfaces can access a wide range of applications provided by multiple wireless networks in an Always Best Connected mode [3-5]....
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01 Sep 2011
TL;DR: A novel approach power control is proposed to avoid throughput loss in the 3rd Generation Partnership Project, which still uses fractional power control principle, but differentiates between users generating high interference and users generating low interference.
Abstract: Recently, the 3rd Generation Partnership Project has standardized a power control mechanism for the uplink of the Long Term Evolution system. This mechanism is based on the fractional compensation of the pathloss, also known as fractional power control. This approach decreases inter-cell interference but may impact the throughput. In this paper, a novel approach power control will be proposed to avoid such throughput loss. This method still uses fractional power control principle, but differentiates between users generating high interference and users generating low interference. Our simulations indicate that the proposed power control has better performance than the fractional power control.
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Therefore, only inter-cell interference needs to be dealt with in the LTE system [5]....
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...CONCLUSION AND FUTUR WORK One of the most important 4th generation target is to reach 200 users per cell when operating in a bandwidth of 5 MHz [5]....
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...One of the most important 4th generation target is to reach 200 users per cell when operating in a bandwidth of 5 MHz [5]....
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...Two consecutive RBs (in time domain) are assigned to the same user for a Transmission Time Interval (TTI = 1 ms) [5]....
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