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
Peer Review
TL;DR: Based on the mathematical foundations, eleven types of information measure efficacies and their distribution across information systems are put forward and comprehensively analyzed, which constitutes the basic theoretical framework of information systems dynamics with general significance.
Abstract: This paper firstly reviews and summarizes the rapid development of information technology, characterized by the close combination of computer and network communication, which leads to a series of investigations, including the analyses of the important role of a series of technological achievements in the context of information movement and application, the interrelationship between the real-world, information space and information system, and the integrated framework of the real-world and information system, and the modifications and improvements of the Xu’s previous mathematical theory on information models, properties and metrics. Based on the mathematical foundations, eleven types of information measure efficacies and their distribution across information systems are put forward, and then the dynamics configurations of information systems are comprehensively analyzed, which constitutes the basic theoretical framework of information systems dynamics with general significance. Finally, Smart Court SoSs (System of Systems) Engineering Project of China are introduced as the exemplified application of the theoretical work, which aims at providing a reference for the analysis, design, development and evaluation of large-scale complex information systems. Keyword Information Space, Structural Framework, Metaverse, Information Model, Information Measure, Information System Dynamics, Smart Court SoSs Engineering!
Journal ArticleDOI
30 Mar 2015
TL;DR: In this article, the authors proposed a method of distribution of system resources to ensure efficient processing of applications that allows to monitor the quality of services, taking into account the required number of resources to serve one application and statistics about the number of applications of each type of service received in a given time interval.
Abstract: The functioning of the online charging is important for the efficient work of mobile operator. The main disadvantage of a modern system service calls is that they do not consider the important technical and charging parameters of services, as the result, there is not enough rational utilization of server resources. The article proposes a method of distribution of system resources to ensure efficient processing of applications that allows to monitor the quality of services, taking into account the required number of resources to serve one application and statistics about the number of applications of each type of service received in a given time interval. It will allocate resources in proportion to the requirements of the service and configure the distribution of inputs respectively of the input stream, and to ensure the maximization of economic efficiency of service delivery. In the section “Modern problems of service calls” the main disadvantages of modern systems of billing were analyzed. The work of the billing server is described in the section “Processing of calls in Online Charging System. The problem of resource allocation system is solved in the third section, called “The problem of distribution of server resources”.
01 Jan 2013
TL;DR: System approaches for modeling the antenna arrays and the mutual coupling are presented, based on the characterization of linear time invariant systems for UWB antenna arrays.
Abstract: This paper presents system approaches for modeling the antenna arrays and the mutual coupling. The modeling based on the characterization of linear time invariant systems can be exploited in the case of UWB antenna arrays for difierent issues: the expression of the beampattern of an array of N-antennas, the determination of a time-frequency model of TX antenna arrays, and the characterization of the mutual coupling between two elements.
Journal ArticleDOI
TL;DR: The proposed STEC outperforms sophisticated TEC algorithms on average PSNR by 0.3 dB on the packet error rate of 20% at least.
Abstract: Generally, the temporal error concealment (TEC) adopts the blocks around the corrupted block (CB) as the search pattern to find the best-match block in previous frame. Once the CB is recovered, it is referred to as the recovered block (RB). Although RB can be the search pattern to find the best-match block of another CB, RB is not the same as its original block (OB). The error between the RB and its OB limits the performance of TEC. The successively temporal error concealment (STEC) algorithm is proposed to alleviate this error. The STEC procedure consists of tier-1 and tier-2. The tier-1 divides a corrupted macroblock into four corrupted 8 × 8 blocks and generates a recovering order for them. The corrupted 8 × 8 block with the first place of recovering order is recovered in tier-1, and remaining 8 × 8 CBs are recovered in tier-2 along the recovering order. In tier-2, the error-adaptive block matching principle (EA-BMP) is proposed for the RB as the search pattern to recover remaining corrupted 8 × 8 bloc...
Journal ArticleDOI
TL;DR: In this article, the authors proposed a compact antenna with the dual-band characteristics, which meet the specification of the LTE frequency band (680-900 MHz and 2.28-2.82 GHz) and the total size of the antenna is 54 × 26.6 mm2.
Abstract: Long-term evolution (LTE) (fourth generation mobile networks) has utilized multiple-input–multiple output (MIMO) technology to achieve very high data rates in both uplink and downlink. MIMO is based on the multiple antenna systems within the small size mobile terminal. One of the challenges is to miniaturize the mobile terminal. In this article, a compact antenna with the dual-band characteristics, which meet the specification of the LTE frequency band (680–900 MHz and 2.28–2.82 GHz) is proposed. The bandwidths of both the lower and the higher frequency bands are 320 and 540 MHz, respectively. The total size of the antenna is 54 × 26.6 mm2. A fairly good agreement has been shown between the simulation and experimental results. The study on the effect of the various antenna parameters has also been discussed. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1379–1382, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27566
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 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.