LTE-advanced: next-generation wireless broadband technology [Invited Paper]
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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10 Jul 2014
TL;DR: The paper discusses the AS IC realization of PDSCH transmitter architecture consisting of addition of Cyclic Redundancy Check bits, channel coding, rate matching, scrambling, modulation, precoding and mapping to resource element as well as the receiver architecture comprising of resource element demapping, Multiple Input Multiple Output receiver processing, demodulation, descrambling, rate de-matching and channel decoding.
Abstract: Long Term Evolution (LTE) is a paradigm for mobile communication providing high speed data. The LTE terms provide a framework for enlarged capacity, enhanced spectrum efficiency and coverage as well as condensed latency as compared to the second and third generation wireless networks. Six downlink channels are used by LTE of which three are data bearing channels and the rest are control channels. Physical Downlink Shared Channel (PDSCH) is the key among the data channels. The paper discusses the AS IC realization of PDSCH transmitter architecture consisting of addition of Cyclic Redundancy Check bits, channel coding, rate matching, scrambling, modulation, precoding and mapping to resource element as well as the receiver architecture comprising of resource element demapping, Multiple Input Multiple Output receiver processing, demodulation, descrambling, rate de-matching and channel decoding. The channel coding used is turbo coding and the turbo coding is realized using Maximum a-posteriori probability algorithm. The modulation schemes used are QPSK, 16-QAM and 64 QAM. The transmitter and receiver architectures are implemented for the aforesaid modulation schemes and the differences are compared. The tools used for implementation purpose are Xilinx IS E 14.2 and ISim both of which are provided by Xilinx and for synthesis and layout, tools provided by Cadence such as RTL compiler and Encounter were used.
5 citations
Cites background from "LTE-advanced: next-generation wirel..."
...LTE/LTEadvanced [1] use core network enhancements as well as distinct radio standards to amplify the network capacity with the addition of improved speed....
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09 Jun 2013
TL;DR: A novel method for modeling interference at the edges of the region of interest (ROI) of the cellular topology is proposed, which can still be applied over existing solutions without distorting their topology, as conventional toroid shaping is not required.
Abstract: Due to the large number of wireless cells that are required for accurately evaluating inter-site interference in cellular networks, computational resources often pose a considerable limitation. In this paper, a novel method for modeling interference at the edges of the region of interest (ROI) of the cellular topology is proposed. While it shares conceptual ground with previous wrap-around techniques, the proposed method can still be applied over existing solutions without distorting their topology, as conventional toroid shaping is not required. Thus, it allows platforms to retain forward compatibility with network planning tools. System level simulations of a one-tier long term evolution (LTE) network have clearly demonstrated uniform interference across the ROI while achieving an almost three-fold increase in computational efficiency over existing platforms.
5 citations
Cites background from "LTE-advanced: next-generation wirel..."
...In addition, in single-tier simulations, advanced features of LTEA, such as coordinated multipoint (CoMP) [4, 5] cannot be simulated reliably....
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TL;DR: The design and implementation of a LTE-Advanced system platform based on software defined radio that has flexible implementation; commom construction; strong ability of modular, expansibility and portability; easy to improve and extend; suitable for testing and verifying evolving LTE- advanced system.
Abstract: —This paper presents the design and implementation of a LTE-Advanced system platform based on software defined radio. The platform has flexible implementation; commom construction; strong ability of modular, expansibility and portability; easy to improve and extend; suitable for testing and verifying evolving LTE-Advanced system. With the platform, we conduct real-time experiments for investigating LTEAdvanced Heterogeneous Networks and the interference management schemes in real wireless environments. The results of real-time experiments truly reflected the influence of channel environment and interference to heterogeneous networks. In the situation without interference management, the Bit Error Rate of user equipments in heterogeneous networks is as high as 3040% due to the interference. Therefore, user equipments cannot communicate properly. When the interference management scheme is used, user BER drops significantly. At the same time, the throughput of users decreases slightly from that without interference management. The throughput of the users decline slightly and the BER decreases obviously, in return.
5 citations
Cites background from "LTE-advanced: next-generation wirel..."
...Standards development for LTE continues toward establishing an enhancement called LTEAdvanced that can respond to future challenges [3]....
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TL;DR: Simulation results show that average packet delay and average packet loss do not increase significantly by utilising the active ONU-BS devices whereas their corresponding peers are sleeping, and the proposed framework provides significant amount of energy savings at the ONUs when compared with regular operation mode.
Abstract: Access networks contribute a significant portion of the energy consumption of the telecom network. In this study, the authors propose a distributed bandwidth allocation signalling framework for a green hybrid Fibre-Wireless (Fi-Wi) access network, which is based on the convergence of ethernet passive optical network and third-generation partnership project-long-term evolution-advanced technologies. According to the proposed framework, the Fi-Wi network is deployed by pairing joint optical network unit-base station (ONU-BS) nodes. An ONU-BS that is experiencing light load from the end-users sends a SLEEP signal to the optical line terminal (OLT), and switches to the stand-by mode whereas its BS module forwards the traffic to the peer ONU-BS. The peer ONU-BS keeps buffering the requests destined to the sleeping ONU-BS, and sends REPORTs for the corresponding packets to the OLT. Through simulations, the authors generate various traffic profiles, and show that the proposed framework provides significant amount of energy savings at the ONUs when compared with regular operation mode. Furthermore, the simulation results also show that average packet delay and average packet loss do not increase significantly by utilising the active ONU-BS devices whereas their corresponding peers are sleeping.
5 citations
01 Sep 2016
TL;DR: In this article, the authors investigated the problem of radio resource block allocation in such SINR limited maritime channels and found that the max-min optimization method performs better than the opportunistic and round robin methods.
Abstract: In this study, we describe the behavior of LTE over the sea and investigate the problem of radio resource block allocation in such SINR limited maritime channels. For simulations of such sea environment, we considered a network scenario of Bosphorus Strait in Istanbul, Turkey with different number of ships ferrying between two ports at a given time. After exploiting the network characteristics, we formulated and solved the radio resource allocation problem by max-min integer linear programming method. The radio resource allocation fairness in terms of Jain's fairness index was computed and it was compared with round robin and opportunistic methods. Results show that the max-min optimization method performs better than the opportunistic and round robin methods. This result in turn reflects that the max-min optimization method gives us the high minimum best throughput as compared to other two methods considering different ship density scenarios in the sea. Also, it was observed that as the number of ships begin to increase in the sea, the max-min method performs significantly better with good fairness as compared to the other two methods.
5 citations
References
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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
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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