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Journal ArticleDOI

LTE-advanced: next-generation wireless broadband technology [Invited Paper]

01 Jun 2010-IEEE Wireless Communications (IEEE Press)-Vol. 17, Iss: 3, pp 10-22
TL;DR: An overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed, which includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, and heterogeneous networks with emphasis on Type 1 and Type 2 relays.
Abstract: LTE Release 8 is one of the primary broadband technologies based on OFDM, which is currently being commercialized. LTE Release 8, which is mainly deployed in a macro/microcell layout, provides improved system capacity and coverage, high peak data rates, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operation and seamless integration with existing systems. LTE-Advanced (also known as LTE Release 10) significantly enhances the existing LTE Release 8 and supports much higher peak rates, higher throughput and coverage, and lower latencies, resulting in a better user experience. Additionally, LTE Release 10 will support heterogeneous deployments where low-power nodes comprising picocells, femtocells, relays, remote radio heads, and so on are placed in a macrocell layout. The LTE-Advanced features enable one to meet or exceed IMT-Advanced requirements. It may also be noted that LTE Release 9 provides some minor enhancement to LTE Release 8 with respect to the air interface, and includes features like dual-layer beamforming and time-difference- of-arrival-based location techniques. In this article an overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed. This includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, uplink spatial multiplexing including extension to four-layer MIMO, and heterogeneous networks with emphasis on Type 1 and Type 2 relays. Finally, the performance of LTEAdvanced using IMT-A scenarios is presented and compared against IMT-A targets for full buffer and bursty traffic model.
Citations
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01 Jan 2011
TL;DR: In this article, a technique for measuring VSWR at 18 GHz band for various modulated signals by using directional coupler the power of incident and reflected wave is measured, and in order to minimize the size and cost of the measuring circuit, a SPDT (Single Pole Double Throw) switch is adopted to realize the circuit with just one detector and one A/D (Analog to Digital) converter MCU(Micro Control Unit) is used to calculate the voltage re-flection coefficient and V SWR.
Abstract: This paper has suggested a technique for measuring VSWR at 18 GHz band for various modulated signals By using directional coupler the power of incident and reflected wave is measured, and in order to minimize the size and cost of the measuring circuit, a SPDT(Single Pole Double Throw) switch is adopted to realize the circuit with just one detector and one A/D(Analog to Digital) converter MCU(Micro Control Unit) is used to calculate the voltage re-flection coefficient and VSWR, and the measured VSWR error has improved by approximately 02 with applying a simple bubble sorting algorithm to reduce the measurement error, the MCU process time and load Key words : VSWR, Bubble Sort, Detector, GSM, EDGE, WCDMA, LTE Ⅰ 서 론 이동통신기지국시스템에서안테나전압정재파비(VSWR) 측정기능은필수적요소로서, 안테나동작상태를주기적으로확인하여사용자가미리정한 동작범위에서벗어나는경우경경보(minor alarm)와주경보(major alarm)를발생하는동작을한다 경경보는안테나동작상태가다소악화된상태를감지하기위한것이고, 주경고는안테나동작상태가상당히악화된것으로, 기지국장비에크게영향을주는것을방지하기위해설정한다 기존의VSWR 측정모듈은단순히기지국장비와안테나간의연결상태나안테나의고장여부판단이주요목적이었기때문에정상또는고장상태를구분할정도의사양이면되었다 그러나오늘날이동통신기지국은다양한통신표준을서비스하고또한요구사양
Book ChapterDOI
01 Jan 2012
TL;DR: A rule-based communications service Architecture for the handover authentication mechanism was proposed, which could provide a heterogeneous network integration service architecture for the seamless transition of LTE and WIMAX networks without damaging the respective domains of the networks.
Abstract: With the increasing value-added services of information and mobile networks, the problem of insufficient bandwidth is posing the greatest challenge. To resolve this issue, the LTE (Long Term Evolution) of the 3G Partnership Project (3GPP) and the IEEE 802.16 Worldwide Interoperability for Microwave Access (WiMAX) are using IP-based next-generation network architectures to actively develop the 4G mobile communications network. The main purpose of this study was to examine the development and applications of the key technologies for the next generation heterogeneous mobile communications network architecture. On the basis of the Estinet7.0 simulation platform, this study simulated the implementation of interworking LTE and WiMAX scenarios. The core network architectures of LTE and WiMAX and their components’ functions were first introduced, and then the interoperability scenarios of 4G network technology co-existence and integration were analyzed. Next, this study explored the handover mechanism and other factors of consideration. Based on the signal sign, both in concept and in practice, a rule-based communications service architecture for the handover authentication mechanism was proposed, which could provide a heterogeneous network integration service architecture for the seamless transition of LTE and WIMAX networks without damaging the respective domains of the networks. The proposed architecture is expected to extend the interoperability between LTE and WiMAX systems in a simpler and faster way in the future.
Book ChapterDOI
01 Jan 2018
TL;DR: A new high-performance narrowband Hybrid Beamformation (HBF) system for upcoming mmWave-based 5G system overcomes the pitfall of narrowband Analog only Beamformation and narrowband Digitalonly Beamformation.
Abstract: This paper introduces a new high-performance narrowband Hybrid Beamformation (HBF) system for upcoming mmWave-based 5G system. HBF system overcomes the pitfall of narrowband Analog only Beamformation and narrowband Digital only Beamformation. Next-generation 5G communication system will be taking the advantage of millimeter wave (mmWave) frequencies band that inherits signal fading and immense propagation loss. The move toward the mmWave spectrum facilitates the use of shorter wavelength. This facilitation makes possible for small antennas to focus its radiated signals into narrow beam to compensate for signal fading and path loss. An enhanced version of antenna gain with much focused antenna beam with HPBW of almost 11° with gain of 23.45 dB has been obtained in this paper. Assuming that both BS and MS have prior knowledge of the narrowband mmWave channel, we were able to achieve very low BER of almost zero when good signal strength was maintained after Beamformation.
Book ChapterDOI
01 Jan 2013
TL;DR: This chapter describes the relevant aspects of various cellular approaches, including various 802.16 and 3GPP standards, as well as the newly emerging cognitive or “white space” networking approaches, which are providing extensions to multi-hopping, and becoming more relevant than the 802.11 technology which was earliest put to work on WMNs.
Abstract: While the mesh network paradigm does not constrain the physical and medium layer realizations, some technologies emerge over time as clearly being better suited. This becomes especially true when considering service continuity issues, and therefore robustness of enabling technologies. In recent times, Multiple Input Multiple Output (MIMO) technology at the lower layer is seen to hold promise to improve the predictability and dependability of mesh networks. At a higher level, various cellular approaches, including various 802.16 and 3GPP standards, as well as the newly emerging cognitive or “white space” networking approaches, are providing extensions to multi-hopping, and becoming more relevant than the 802.11 technology which was earliest put to work on WMNs. In this chapter, we briefly describe the relevant aspects of these, including references to some relevant literature. We start with a few remarks on 802.11 as background.
01 Jan 2012
TL;DR: This work was supported by the Spanish Ministry of Science under the project TEC2011-27723-C02-02.
Abstract: The concept of mobile system as we know it today is about to change. It is expected that by 2020 the networks become cooperative and users collaborate in the transmission of information to other devices. This new paradigm of mobile relaying implies a set of new challenges that the scientific community is currently addressing. This paper introduces this new paradigm for mobile communications as well as the main problems, possible solutions, the current state of technology and most appealing research trends.
References
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Proceedings ArticleDOI
01 Sep 2006
TL;DR: A preliminary look at the air interface for Evolved UTRA (E-UTRA) and associated key technologies required to reach its design objectives are provided.
Abstract: With the emergence of packet-based wireless broadband systems such as 802.16e, it is evident that a comprehensive evolution of the universal mobile telecommunications system specifications is required to remain competitive. As a result, work has begun on long term evolution (LTE) of the UMTS terrestrial radio access and radio access network aimed for commercial deployment in 2010. Goals for the evolved system include support for improved system capacity and coverage, high peak data rates, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operations and seamless integration with existing systems. To reach these goals, a new design for the air interface is envisioned. This paper provides a preliminary look at the air interface for Evolved UTRA (E-UTRA) and associated key technologies required to reach its design objectives. Initial E-UTRA system performance results show a 2 to 3x improvement over a reference Rel-6 UMTS system configuration [1, 2] for both uplink and downlink.

30 citations

Proceedings ArticleDOI
24 Oct 2008
TL;DR: The proposed channel estimation technique is shown to have significant gains in performance compared to other well known channel estimation techniques such as the maximum-likelihood (ML) and the inverse fast Fourier transform (IFFT) channel estimation methods.
Abstract: The performance of the uplink physical channel of the 3GPP LTE system is considered in this paper. Assuming a single user spatial division multiple access transmission scheme, where users' signals are transmitted over different subcarriers, a low complexity channel estimation technique is proposed for the physical uplink shared channel (PUSCH). The proposed channel estimation technique is shown to have significant gains in performance compared to other well known channel estimation techniques such as the maximum-likelihood (ML) and the inverse fast Fourier transform (IFFT) channel estimation methods [5]. Simulation results for different channel models and modulation and coding schemes (MCS) using incremental redundancy (IR) based hybrid automatic repeat request (HARQ) operation are also shown. Finally, a robust detection scheme is proposed for the physical uplink control channel (PUCCH) and simulation results are summarized.

10 citations


"LTE-advanced: next-generation wirel..." refers methods in this paper

  • ...The DFT precoding operation is performed to reduce the cubic metric (CM) of the signal, leading to higher maximum transmit power [2]....

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What is the difference between LTE Home Internet and FIOS?

LTE-Advanced (also known as LTE Release 10) significantly enhances the existing LTE Release 8 and supports much higher peak rates, higher throughput and coverage, and lower latencies, resulting in a better user experience.