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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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Journal ArticleDOI
TL;DR: The results show that the proposed algorithm can effectively improve the aggregate throughput and reduce both the packet loss rate and average packet delay in comparison with other schemes, thus enhancing the overall uplink efficiency of LTE networks.
Abstract: In this study, resource allocation problems in uplink transmissions of long term evolution (LTE) networks involving single-carrier frequency division multiple access were addressed and a two-stage process for obtaining solutions was proposed. In the first stage, a buffer-aware (BA) scheme that allocates resources according to users' buffer statuses is used to simultaneously reduce wastage of system resources and improve the throughput of each user. In the second stage, a BA-scheme-based enhanced algorithm is used for considering the delay-sensitive (DS) characteristics of packets. Simulations were conducted to compare the performance of the proposed BA and DS resource allocation algorithm with that of other approaches. The results show that the proposed algorithm can effectively improve the aggregate throughput and reduce both the packet loss rate and average packet delay in comparison with other schemes, thus enhancing the overall uplink efficiency of LTE networks.

2 citations

Proceedings ArticleDOI
28 Jun 2018
TL;DR: The comparative modeling and simulation results regarding to multi-band response obtained by solving Maxwell's numerical equations in frequency domain for initial geometric configuration and when one of the dendritic tree branches is functional affected are presented in this paper.
Abstract: The electromagnetic field recorded outside neurons, such as the scalp, is the result of different ions moving from synapses to soma and further to terminal buttons. This phenomenon can be displaced from low frequency in the microwave field using the corresponding changes of space and time, and the dendritic tree or axons could be modeled as the transmitting or receiving antenna. A compact microstrip antenna modeling the topology of biological neurons is investigated in this paper by using the spatial configuration given into the NeuroMorpho.org data base. This is a continuation of some previous research of authors and is focused on the influence of partial changes of dendritic tree segments, highlighted by changing characteristics of resonance and radiation in free space. The morphometric structures have been translated in the field of microwaves using microstrip line networks. The comparative modeling and simulation results regarding to multi-band response obtained by solving Maxwell's numerical equations in frequency domain for initial geometric configuration and when one of the dendritic tree branches is functional affected are presented in this paper. This kind of antenna is a natural correspondence of the fractal antennas described in the literature for their advantages regarding small sizes and multi-band response.

2 citations


Cites methods from "LTE-advanced: next-generation wirel..."

  • ...The last one method uses the reactance function transformation which is mathematically rigorous, requires no optimization algorithms, and can be created an unlimited number of pass-bands including using TE01δ mode quarter cylindrical dielectric resonators [4]....

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Proceedings ArticleDOI
07 Apr 2013
TL;DR: Based on the channel measurement in a typical indoor environment, wideband multi-input multi-output (MIMO) channel capacity analysis result is reported and a key finding is that the measured maximum channel eigenvalue fits t Location-Scale distribution rather than Gamma distribution in indoor scenario.
Abstract: Based on the channel measurement in a typical indoor environment, wideband multi-input multi-output (MIMO) channel capacity analysis result is reported in this paper. A series of non line-of-sight (NLOS) and LOS measurement positions are planned for capacity comparison in different propagation conditions. For fixed received signal-to-noise ratio (SNR), slight average capacity loss in LOS cases is observed compared to NLOS cases. However, the capacity in presence of LOS component appears more position-sensitive than that in NLOS cases. When considering the large scale path loss difference introduced by the receiver movement, the capacity in LOS cases greatly exceeds the NLOS cases. A key finding is that the measured maximum channel eigenvalue fits t Location-Scale distribution rather than Gamma distribution in indoor scenario. Finally, Ricean K-factor and spatial correlation results are presented.

2 citations


Cites background from "LTE-advanced: next-generation wirel..."

  • ...I. INTRODUCTION Multi-input multi-output (MIMO) systems have attracted abundant research as its promising spectrum efficiency to meet the rapid data traffic growth requirement in indoor scenarios [1]....

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Journal ArticleDOI
TL;DR: This work recasts the problem of multimedia content delivery in the mobile Internet with the major tenet being that real-time playback constraints can be satisfied while at the same time enabling controlled delay tolerance in packet transmission by capitalizing on pre-fetching and data buffering.

2 citations

Proceedings ArticleDOI
23 Aug 2022
TL;DR: Cyber-security measures are applied and incorporated in a cyber-security platform, that was developed within the PHOENIX H2020 project, that is used to detect the attacks and perform necessary mitigation actions for restoring the HPP operation.
Abstract: The recent technological advance in the fifth generation of telecommunication networks (5G) has led to a evolutions in many domains, including connected cars, manufacturing and electricity. A technological domain that had large benefits from this advance is the Electrical Power and Energy System (EPES). Despite the simplicity and efficiency that 5G brings there are also underlying risks that are slowing down its adoption. These risks are caused by the presence of convergence connectivity interfaces in legacy infrastructures that were built with no security in mind. Specifically, EPES systems are often targeted by cyber criminals to cause massive blackouts in entire cities or countries that in turn lead to societal impact, such as consumer discomfort. In this work we propose a cyber-security measures for 1) early-stage detection of cyber-security incidents and 2) protecting against them through applicable security measures. The proposed measures are applied to a Hydroelectric Power Plant (HPP) of the Public Power Corporation (PPC). The cyber-attacks are performed in a 5G-enabled smart meter that measures power production and transmits measurements to PPC’s control center through the use of 5G Network Function Virtualization (NFV) technologies, such as network slicing. To protect against the attacks, cyber-security measures are applied and incorporated in a cyber-security platform, that was developed within the PHOENIX H2020 project. The measures are used to detect the attacks and perform necessary mitigation actions for restoring the HPP operation.

2 citations

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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Trending Questions (1)
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.