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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03 Apr 2012
TL;DR: The method of implementing DL asynchronous HARQ in LTE TDD system that the eNB can apply by UL-DL configuration as minimizing the HARQ RTT is suggested and the QoS requirement of the retransmitted packet would not be satisfied by increased end-to-end latency.
Abstract: The HARQ enables the error correction of the unsuccessfully decoded transport block, but it requires redundancy retransmissions and delay in receiving an acknowledgement In order to provide the flexibility of scheduling, the DL of LTE system uses the asynchronous HARQ so that retransmissions occur at any time Generally in the FDD, the HARQ round trip time (RTT) which is time interval between initial transmission and retransmission is fixed In the TDD, UL/DL subframe is separated in time domain by UL-DL configuration, so the HARQ RTT is different according to each subframe and that would be longer than the FDD Especially when retransmissions occur, if the HARQ RTT increases, the QoS requirement of the retransmitted packet would not be satisfied by increased end-to-end latency In this paper, we suggest the method of implementing DL asynchronous HARQ in LTE TDD system that the eNB can apply by UL-DL configuration as minimizing the HARQ RTT, and analyze in aspect of the HARQ RTT
15 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...The average HARQ RTT can be minimized if the first transmitted TB among the TBs receiving the HARQ feedback is retransmitted with priority[1]....
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...When retransmissions occur and the HARQ RTT increases, the QoS requirement of the retransmitted packet would not be satisfied due to the increased end-to-end latency[6]....
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...In this paper, we suggest the method of implementing DL asynchronous HARQ in LTE TDD system that the eNB can apply by UL-DL configuration as minimizing the HARQ RTT, and analyze in aspect of the HARQ RTT. Index Terms — Downlink Asynchronous HARQ, LTE, TDD, TD-LTE I. INTRODUCTION The Long Term Evolution (LTE) and LTE-Advanced are being standardized by the 3rd Generation Partnership Project (3GPP) in order to satisfy the 4G requirement of IMT-Advanced, and to provide high data rate and good QoS[1][2]....
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...The Long Term Evolution (LTE) and LTE-Advanced are being standardized by the 3rd Generation Partnership Project (3GPP) in order to satisfy the 4G requirement of IMT-Advanced, and to provide high data rate and good QoS[1][2]....
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...However, the HARQ requires redundancy retransmissions and delay in receiving the acknowledgement by the receiver[1]....
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TL;DR: A performance upper bound as well as an efficient heuristic algorithm for subcarrier and slot allocation which outperforms existing algorithms under polynomial complexity are developed.
Abstract: Optimizing resource allocation over only the frequency dimension in a single-cell OFDMA network is strictly suboptimal when heterogeneous non-real-time data users coexist. In this work we examine how to jointly exploit multi-user diversity on frequency and time domains towards maximizing cell throughput performance and satisfying individual rate and fairness QoS constraints. We develop a performance upper bound as well as an efficient heuristic algorithm for subcarrier and slot allocation which outperforms existing algorithms under polynomial complexity.
15 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...For further details about UPL and its validity see [1], [5]....
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25 Mar 2008
TL;DR: In this paper, the authors provide quantitative measurements of the actual performance of two state-of-the-art live networks in Finland, including metrics such as throughput, delay and VoIP quality considering network performance both on static and mobile scenarios.
Abstract: HSDPA networks are intensively being deployed to provide mobile broadband connectivity to mobile devices. In addition to HSDPA, FLASH-OFDM is another wireless broadband option operating in a licensed spectrum. However, if operated at very low frequencies like the network in Finland,, it is particularly interesting for emerging markets, especially for rural areas which are lacking telecommunications infrastructure. In contrast to the HSDPA standards, the FLASH-OFDM systems are proprietary. The market dynamics are very different between standardized and proprietary systems, sometimes causing extra challenges for the deployment of proprietary systems. This paper provides quantitative measurements of the actual performance of two state-of-the-art live networks in Finland. The evaluation includes metrics such as throughput, delay, and VoIP quality considering network performance both on static and mobile scenarios. A commercial deployment evaluation is included in the analysis complementing the measurement data in order to provide a comprehensive view of the challenges.
15 citations
Patent•
10 Jun 2010TL;DR: In this paper, an interference whitener is used to provide interference whitening of a front end signal and a digital receiver is connected to the output from the interference whiteners. But the interference whiteening is not considered in this paper.
Abstract: An arrangement (10) for noise rise estimation comprises a front end signal conditioning arrangement (9) and an interference whitener (14) connected thereto. The interference whitener (10) is arranged for providing interference whitening of a front end signal. A processor (20) is arranged for measuring received total wideband power received at the front end signal conditioning arrangement (9) a plurality of times. An estimate of a noise floor measure is computed by the processor (20) based on the measured received total wideband powers. The processor (20) determines an equivalent total wideband power of the output from the interference whitener (14). The processor (20) also calculates a noise rise measure, based on the equivalent total wideband power and the noise floor measure, and compensates the noise rise measure for the interference whitening. A digital receiver (12) is connected to the output from the interference whitener (14).
15 citations
TL;DR: A brand-new fog computing structure is proposed, which acts as an intermediate layer between the end users and the 3G infrastructure and ensures reliable wireless service for fast-moving users, such as passengers on trains.
15 citations