scispace - formally typeset
Search or ask a question
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
More filters
Proceedings ArticleDOI
01 Sep 2015
TL;DR: This paper focuses on energy efficiency (EE) as a performance index, which is quantified as the number of bits that can be transmitted per unit of energy consumption, and derives the EE as a function of the distance between BS and RS.
Abstract: In cellular systems, the relaying technique is used for increasing service coverage, system capacity, and cell- edge user throughput at a relatively low cost. However, the introduction of relay stations (RSs) leads to a more complex intra-cell and inter-cell interference problem between the base station (BS) and RSs. The fractional frequency reuse (FFR) is one of the most simple and efficient (thus, practical) techniques to solve this problem. To heighten the performance of cellular systems with the relaying/FFR combination, the deployment (i.e., the positioning) of RSs should be managed carefully. In this paper, we focus on energy efficiency (EE) as a performance index, which is quantified as the number of bits that can be transmitted per unit of energy consumption. We first derive the EE as a function of the distance between BS and RS. Then, we find out the optimal distance using optimization approach. Based on the numerical results, we provide a guideline in the deployment of RSs.

2 citations


Additional excerpts

  • ...In advanced cellular systems, the relaying technique is used for increasing service coverage, system capacity, and cell-edge user throughput at a relatively low cost [1]....

    [...]

01 Jan 2014
TL;DR: In this article, the bit error rate (BER) and performance of BPSK modulation and MIMO-OFDM system over multipath fading channel is compared and analyzed, and all the results obtained are simulated by using the MATLAB.
Abstract: In this paper we present an analytical approach to evaluate the Bit error rate (BER) and performance of BPSK (or 2PSK) modulation and MIMO-OFDM system over multipath fading channel is compared and analyzed. In wireless communication systems, complex base-band signals must be converted in to real pass-band signals. Multi-carrier modulation (MC) is a technique for data-transmission by dividing a high-bit rate data stream is several parallel low bit-rate data streams and using these low bit-rate data streams to modulate several carriers. MultiCarrier Transmission has a lot of useful properties such as delay-spread tolerance and spectrum efficiency that encourage their use in broadband wireless communications. OFDM is a multi-carrier modulation technique with densely spaced sub-carriers. This report is intended to provide a tutorial level introduction to OFDM Modulation, its advantages and demerits, and some applications of OFDM. I show the BER for an MIMO and OFDM system with BPSK modulation technique. The Simulation results show that the simulated bit error rate is a good agreement with the theoretical BER for BPSK modulation in OFDM system. All the results obtained are simulated by using the MATLAB.

2 citations

Proceedings ArticleDOI
Lei Feng1, Mengjun Yin1, Nan Xiang1, Wenjing Li1, Xuesong Qiu1 
01 Sep 2014
TL;DR: This paper proposes a load-balancing strategy based on Coordinated Multiple Points transmission/reception among the Base Stations (BS) based on CoMP with guaranteed call blocking rate.
Abstract: As a major part of wireless network optimization, load balancing can make the BS's resource utilization more reasonable This paper proposes a load-balancing strategy based on Coordinated Multiple Points (CoMP) transmission/reception among the Base Stations (BS) To use universally, different patterns of load-balancing based on CoMP are modeled and discussed We define call blocking rate as the QoS metric to be guaranteed during load balancing process The capacity of load-balancing and call blocking rate with different load-balancing patterns based on CoMP are evaluated and analyzed in an area with a moderate dense distribution of high-loaded BSs The analysis on the numerical results give the proper load balancing pattern based on CoMP with guaranteed call blocking rate

2 citations


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

  • ...Due to the cooperation diversity, CoMP can potentially lead to diminishing of inter-cell interferences[11]....

    [...]

Dissertation
25 Jul 2019
TL;DR: In this article, a modelo de referencia baseado in IoT and descrito e describimento of the solucoes disponiveis e apresentada, with o objetivo of determining the abordagens mais relevantes and identificar questoes abertas de pesquisa.
Abstract: Com o aumento da densidade populacional e o exodo rural para as cidades, a urbanizacao esta assumindo proporcoes extremas e apresenta um tremendo problema urbano relacionado a geracao de residuos. O aumento da geracao de residuos tem sido considerado um desafio significativo para os centros urbanos em todo o mundo e representa uma questao critica para os paises com crescimento populacional acelerado nas cidades. A Internet das Coisas (do Ingles, Internet of Things – IoT) e a computacao em nuvem (do Ingles, Cloud computing) oferecem uma possibilidade de automacao por meio de sistemas ciber-fisicos que mudarao a maneira como o gerenciamento de residuos solidos e realizado. Considerando os requisitos de IoT, esta dissertacao explora uma analise de revisao dos modelos de gestao de residuos disponiveis na literatura, efetua uma profunda revisao literaria relacionada a infraestrutura de IoT para o manuseio eficiente de residuos gerados em cenarios urbanos, focando na interacao entre concessionarias e geradores de residuos (cidadaos) na perspectiva de um menor tempo de coleta com reducao de custos, bem como promocao da cidadania. Um modelo de referencia baseado em IoT e descrito e uma analise comparativa das solucoes disponiveis e apresentada, com o objetivo de destacar as abordagens mais relevantes e identificar questoes abertas de pesquisa sobre o tema. Em seguida, e proposto um sistema integrado que combina identificacao por meio de sensores ultrassonicos e sensores de celula de carga, localizacao por Sistema de Posicionamento Global (em ingles, Global Positioning System - GPS) e comunicacao atraves do Sistema Global de Comunicacoes Moveis (do ingles, Global System for Mobile Communications - GSM) / Servicos Gerais de Pacote por Radio (do ingles, General Packet Radio Service - GPRS). Em outras palavras, tudo para fornecer aos cidadaos uma melhor metodologia de disposicao dos residuos gerados em suas residencias, alem de ser facilmente integrado ao servico de coleta municipal para auxiliar no agendamento eficiente da coleta, promovendo rotas otimizadas. E por fim e apresentado a integracao do sistema com uma camada de software, denominada Middleware que recebe os dados transmitidos pelo dispositivo inteligente, executa os tratamentos necessarios e faz o armazenamento desses dados para que a aplicacao atraves do App desenvolvido para smartphones possa, via Internet, acessar os dados presentes no middleware e disponibilizar informacao aos usuarios. A solucao e demonstrada, validada e esta pronta para uso.

2 citations


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

  • ...4 [67], LoRa [82], wave Z, GSM/GPRS, Wide Band Code Division Multiple Access (WCDMA), long term evolution (LTE) and Advanced LTE [83,84], near field communication (NFC) [85], Ultra-wideband (UWB) [86] and 6LoWPAN [77,87], and the IoT nodes must operate with low power consumption....

    [...]

  • ...LTE Advanced (LTE-A) is an enhanced version of conventional LTE and includes broadband coverage, spatial multiplexing, greater coverage, and better performance with lower latencies [84]....

    [...]

01 Jun 2011
TL;DR: Lim et al. as mentioned in this paper presented a MAC protocol design for the support of DBA in OFDMA-PON networks, presented at the Future Network and Mobile Summit 2011.
Abstract: Wansu Lim, Ali Gliwan, Pandelis Kourtessis, Konstantinos Kanonakis, Ioannis Tomkos, John Senior, 'MAC Protocol Design for the Support of DBA in OFDMA-PON Networks', Paper presented at the Future Network and Mobile Summit, 15-17 June 2011, Warsaw, Poland

2 citations


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

  • ...In addition, in support of wireless backhauling, Base Station bandwidths could reach up to 400 Mbits/s with current deployment scenarios and up to few Gbits/s with their future extensions [2]....

    [...]

References
More filters
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]....

    [...]

Trending Questions (1)
What is the difference between LTE and FIOS Internet?

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.