Book•
3G Evolution : HSPA and LTE for Mobile Broadband
31 Jul 2007-
TL;DR: In this paper, the authors present a very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by threeGPP with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE.
Abstract: This very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by 3GPP, with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE. The key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of HSPA and LTE implementation are given. An overview of other related systems such as TD SCDMA, CDMA2000, and WIMAX is also provided.This is a 'must-have' resource for engineers and other professionals working with cellular or wireless broadband technologies who need to know how to utilize the new technology to stay ahead of the competition.The authors of the book all work at Ericsson Research and are deeply involved in 3G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of both HSPA and LTE within 3GPP. * Gives the first explanation of the radio access technologies and key international standards for moving to the next stage of 3G evolution: fully operational mobile broadband* Describes the new technologies selected by the 3GPP to realise High Speed Packet Access (HSPA) and Long Term Evolution (LTE) for mobile broadband * Gives both higher-level overviews and detailed explanations of HSPA and LTE as specified by 3GPP
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01 Jan 2010
TL;DR: This text gives an overview of critical technology challenges for high efficiency power amplifiers used in future mobile broadband systems and possible transmitter architectures with potential of meeting ambitious efficiency, flexibility and frequency range goals.
Abstract: This text gives an overview of critical technology challenges for high efficiency power amplifiers used in future mobile broadband systems. Implementation aspects of efficient wideband multi-band transmitters are discussed. Simulations of and design implications for a multi-band 1.8–2.7 GHz high efficiency power amplifier using GaN transistors are presented. Finally possible transmitter architectures with potential of meeting ambitious efficiency, flexibility and frequency range goals are briefly analyzed.
2 citations
TL;DR: This paper presents a training-based CFR estimation scheme, which is hardware efficient when integrated with SC-FDE and space-time coding (STC) in MIMO systems, and investigates the optimal design of training signals under both criteria.
Abstract: Since its recent adoption for the uplink transmissions in the next-generation cellular systems 3GPP long-term evolution (LTE) and LTE advanced, single-carrier frequency-domain equalization (SC-FDE), an effective technique to mitigate the distortion induced by long-spanning intersymbol interference has seen a surge of interest in the research community. Implementation of SC-FDE in multiple-input multiple-output (MIMO) systems usually requires, in advance, the channel information in terms of the channel frequency response (CFR). In this paper, we present a training-based CFR estimation scheme, which is hardware efficient when integrated with SC-FDE and space-time coding (STC) in MIMO systems. A thoroughmean square error (MSE) analysis of this CFR estimation scheme is provided, where we consider linear estimators based on both least squares (LS) and minimum MSE (MMSE) criteria by assuming different knowledge of the channel statistics. More specifically, for the LS-based approach, we assume no a priori knowledge of the channel statistics is given other than the noise statistics, while for the MMSE-based method, we assume both the channel covariance matrix and the noise statistics are known. Given a constraint which effectively limits the transmit power of training signals, we also investigate the optimal design of training signals under both criteria. For the special case when the number of transmit antennas is equal to 2, we further demonstrate that the CFR estimation could be implemented in an adaptive manner by means of certain block-wise recursive algorithms. Extensive simulation results are provided, which demonstrate the efficacy of this CFR estimation scheme.
2 citations
Additional excerpts
...adopted for the uplink transmissions in the next-generation cellular systems 3GPP long-term evolution (LTE) and LTE advanced [4]....
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28 Feb 2017
TL;DR: In this article, a model analisa ying digunakan berdasarkan prinsiptekno-ekonomi dengan metoda capacity estimation and coverageplanning untuk menentukan perancangan teknologi 4G LTE and metodaDCF untuan menganalisa secara ekonomi dalam mengukur kelayakanbiaya ying dikeluarkan untuk implementasi 4G- LTE tersebut denganmemanfaatkan resource spectrum frekuensi sec
Abstract: Tantangan penyediaan jaringan komunikasi nirkabel yang handaldengan kapasitas sistem yang tinggi tidak terlepas dari biaya investasiyang tinggi. Pemanfaatan resource spectrum secara efisien yangsemaksimal mungkin merupakan salah satu solusi untuk mengatasibiaya investasi yang tinggi. Penelitian ini mem-fokuskan pada analisistekno ekonomi implementasi secara co-existance antara jaringan 2G/3Gexisting dan 4G LTE sesuai dengan tingkat prosentase pertumbuhanpelanggan nirkabel layanan data (2015-2019) dengan membandingkanmana yang lebih ekonomis apakah menggunakan resource spektrumfrekuensi di 900MHz atau 1800MHz.Pada penelitian ini model analisa yang digunakan berdasarkan prinsiptekno-ekonomi dengan metoda capacity estimation dan coverageplanning untuk menentukan perancangan teknologi 4G LTE dan metodaDCF untuk menganalisa secara ekonomi dalam mengukur kelayakanbiaya yang dikeluarkan untuk implementasi 4G LTE tersebut denganmemanfaatkan resource spectrum frekuensi secara efisien pada operatorselluler Indosat Ooredoo.Hasil dari penelitian menunjukan bahwa implementasi migrasi jaringan2G/3G ke 4G LTE pada frekuensi 1800MHz menggunakan bandwidth10 MHz dari perhitungan ekonomi menghasilkan hasil yang lebihefisien dan layak untuk di implementasikan. Diperoleh diperoleh nilaiNPV positif sebesar Rp107.749.194.676 dan IRR sebesar 31.07%,dengan nilai Pay Back Period 3 Tahun 6 Bulan. Dibandingkan denganpenggelaran 4G LTE pada frekuensi 900MHz dengan bandwidth 5MHzdiperoleh nilai NPV positif sebesar Rp 61.075.272.890, namun IRRhanya sebesar 1,71% (dibawah suku bunga perbankan), dengan nilaiPay Back Period 4 Tahun 1 Bulan.
2 citations
TL;DR: The availability and performance of the RRC enhancements, continuous packet connectivity (CPC), and the enhanced forward access channel (Enhanced FACH), have emerged in UMTS are measured, demonstrating that these enhancements offer significant reductions in latency, mobile device energy consumption, and improved end user experience.
Abstract: Broadband mobile networks utilize a radio resource control (RRC) state machine to allocate scarce radio resources. Current implementations introduce high latencies and cross-layer degradation. Recently, the RRC enhancements, continuous packet connectivity (CPC), and the enhanced forward access channel (Enhanced FACH), have emerged in UMTS. We measure the availability and performance of these enhancements on a network serving a market with a population in the millions. We demonstrate that these enhancements offer significant reductions in latency, mobile device energy consumption, and improved end user experience. We develop new over-the-air measurements that resolve existing limitations in measuring RRC parameters. We find CPC provides significant benefits with minimal resource costs, prompting us to rethink past optimization strategies. We examine the cross-layer performance of CPC and Enhanced FACH, concluding that CPC provides reductions in mobile device energy consumption for many applications. While the performance increase of HS-FACH is substantial, cross-layer performance is limited by the legacy uplink random access channel (RACH), and we conclude full support of Enhanced FACH is necessary to benefit most applications. Given that UMTS growth will exceed LTE for several more years and the greater worldwide deployment of UMTS, our quantitative results should be of great interest to network operators adding capacity to these networks. Finally, these results provide new insights for application developers wishing to optimize performance with these RRC enhancements.
2 citations
Cites methods from "3G Evolution : HSPA and LTE for Mob..."
...Consequently, our experiments are limited to CPC andHS-FACH....
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31 Oct 2015
TL;DR: Results show that for streaming flows, Log Maximum-Largest Weighted Delay First shows best PLR performance among the considered scheduling schemes, and for best effort flows, it outperforms theother two algorithms in terms of packet delay and throughput.
Abstract: Long Term Evolution (LTE) network deploys Orthogonal Frequency Division Multiple Access (OFDMA) technology for downlink multi-carrier transmission. To meet the Quality of Service (QoS) requirements for LTE networks, packet scheduling has been employed. Packet scheduling determines when and how the user’s packets are transmitted to the receiver. Therefore effective design of packet scheduling algorithm is an important discussion. The aims of packet scheduling are maximizing system throughput, guaranteeing fairness among users, andminimizing either or both PacketLoss Ratio (PLR)and packet delay. Inthis paper, the performance of two packet scheduling algorithms namely Log Maximum-Largest Weighted Delay First (LOG-MLWDF) and Max Delay Unit (MDU), developed for OFDM(Orthogonal Frequency Division Multiplexing)networks, has been investigated in LTE downlink networks, and acomparison of those algorithmswith a well-known scheduling algorithm namely Maximum-Largest Weighted Delay First(MLWDF) has been studied.The performance evaluation was in terms of system throughput, PLR and fairness index. This study was performed forboth real time (voice and video streaming)and non-real time (best effort)perspectives. Results show that for streaming flows,LOG-MLWDF shows best PLR performance among the considered scheduling schemes, and for best effort flows, it outperforms theother two algorithms in terms of packet delay and throughput.
2 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Some of its key features include increased data rate, a scalable bandwidth, increased coverage and capacity, and reduced latency that result in better Quality of Services (QoS) in communication....
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