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3G Evolution : HSPA and LTE for Mobile Broadband

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
Citations
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Patent
Udo Wachsmann1
09 Feb 2009
TL;DR: In this paper, a technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed, which includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNRs values are attenuated.
Abstract: A technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed. In a method realisation, the technique includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNR values are attenuated, and determining the scaling factor for soft bit quantization dependent on the weighted average.

11 citations

Patent
21 Sep 2011
TL;DR: In this article, a method, an apparatus, and a computer program product for wireless communication are provided, where a first set of tracking loops associated with unicast signals and a second set of trackers associated with multicast/broadcast signals are provided.
Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. In a first configuration, the apparatus maintains a first set of tracking loops associated with unicast signals and a second set of tracking loops associated with multicast/broadcast signals. In addition, the apparatus decoding at least one of a received unicast signal based on the first set of tracking loops or a received multicast/broadcast signal based on the second set of tracking loops. In a second configuration, the apparatus maintains a TTL and a FTL associated with unicast signals based only on received unicast signals. In addition, the apparatus receives a multicast/broadcast signal and decodes the received multicast/broadcast signal based on the TTL and the FTL maintained based only on the received unicast signals.

11 citations

Book ChapterDOI
01 Jan 2012
TL;DR: This study proposes and evaluates four approaches for the selection of the Modulation and Coding Scheme that will be utilized for the transmission of the MBSFN data and concludes that the approach that either maximizes or achieves a target SE for the corresponding users’ distribution is determined.
Abstract: Long Term Evolution (LTE) constitutes the latest step before the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the functionality to transmit MBMS over Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. In MBSFN transmissions, the achieved Spectral Efficiency (SE) is mainly determined by the Modulation and Coding Scheme (MCS) selected. This study proposes and evaluates four approaches for the selection of the MCS that will be utilized for the transmission of the MBSFN data. The evaluation of the approaches is performed for different users’ distribution and from a SE perspective. Based on the SE measurement, the approach that either maximizes or achieves a target SE for the corresponding users’ distribution is determined.

11 citations

Journal ArticleDOI
TL;DR: A system of cell equations is established for the uplink cell loads and blocking probabilities, taking these FPC parameters, irregular cell areas, service specific user distributions, and mutual cell interference into account, and present numerical results for an example network.
Abstract: Fractional Power Control (FPC) has recently been standardized for the uplink in the Long Term Evolution (LTE) of Universal Mobile Telecommunication Systems (UMTS) radio networks. The behavior of FPC is mainly governed by two cell specific parameters, the path loss compensation factor and the power offset. Radio network operators face the problem to plan these parameters for LTE network deployments. In this work we establish a system of cell equations for the uplink cell loads and blocking probabilities, taking these FPC parameters, irregular cell areas, service specific user distributions, and mutual cell interference into account. The equations describe the situation when the achieved uplink connection bandwidths follow a generalized Shannon-Hartley capacity law. We suggest to use solutions of these equations for planning and optimizing the FPC cell parameters of LTE networks. We develop such an optimization procedure with three consecutive stages and present numerical results for an example network.

11 citations


Cites background from "3G Evolution : HSPA and LTE for Mob..."

  • ...In [4], [17] semi-static link-level simulations of 57 equally sized hexagonal cells of a LTE network have been performed to investigate the influence of uniform FPC parameters on the user throughput....

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  • ...The developed analytic approximation complements an analog system of cell equations for the downlink of LTE networks which has been developed in [11]....

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  • ...In order to support LTE planning decisions, the performance of FPC has been analyzed previously....

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  • ...Studies have shown that the use of FPC can increase the overall capacity in LTE networks compared to PC with its full compensation [4] [16] [17]....

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  • ...We developed an analytic approximation for the cell loads and blocking probabilities of the uplink in LTE networks with individual cell FPC parameter settings....

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Proceedings ArticleDOI
Henrik Sahlin1, Anders Persson1
01 Dec 2011
TL;DR: Simulation results indicate that the de-biasing over-sampled DFT based channel estimate is more robust against interference from cyclic shifted reference signals than DCT based channel estimates.
Abstract: The use of MIMO (Multiple Input Multiple Output) in current and future mobile communications relies on accurate channel estimates. In OFDM based systems such as LTE (Long Term Evolution), the channel estimation can be successfully designed with processing in a transform domain, both for uplink and downlink. One such popular transform is to use the IDFT (Inverse Discrete Fourier Transform), window the channel estimate in the time domain and then use DFT to transform back to the frequency domain again. This channel estimate is distorted in the band edges leading to a biased channel estimate. One suggested solution to this problem is to use a DCT (Discrete Cosine Transform) based channel estimator, such that this distortion is reduced. However, as discussed in the current paper, the DCT based channel estimate suffers more from cyclically shifted reference signals, as used for MIMO in LTE for uplink, than the DFT based channel estimator. In order to overcome band edge problems with the DFT based channel estimate, a method is proposed of de-biasing over-sampled DFT based channel estimate by using digital sinc functions. Simulation results indicate that the de-biased DFT based channel estimate is more robust against interference from cyclic shifted reference signals than DCT based channel estimates.

11 citations


Cites background from "3G Evolution : HSPA and LTE for Mob..."

  • ...INTRODUCTION LTE-advanced is the 3GPP (3 Generation Partnership Project) candidate for IMT-Advanced [1]....

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  • ...Keywords- LTE, MIMO, channel estimation, DFT, DCT, cyclic shift, cyclically shifted reference signals, de-bias I. INTRODUCTION LTE-advanced is the 3GPP (3rd Generation Partnership Project) candidate for IMT-Advanced [1]....

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