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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Book•
23 Nov 2012
TL;DR: Yasir Zaki proposes innovative solutions for the design of the Long Term Evolution (LTE) radio scheduler and presents several LTE radio Scheduler analytical models that can be used as efficient tools for radio dimensioning.
Abstract: The key to a successful future mobile communication system lies in the design of its radio scheduler. One of the key challenges of the radio scheduler is how to provide the right balance between Quality of Service (QoS) guarantees and the overall system performance. Yasir Zaki proposes innovative solutions for the design of the Long Term Evolution (LTE) radio scheduler and presents several LTE radio scheduler analytical models that can be used as efficient tools for radio dimensioning. The author also introduces a novel wireless network virtualization framework and highlights the potential gains of using this framework for the future network operators. This framework enables the operators to share their resources and reduce their cost, thus achieving a better overall system performance and radio resource utilization.
30 citations
TL;DR: A series of cell search and synchronization algorithms, which efficiently estimated time and frequency offsets as well as cell ID are presented, which are critically exploited in the algorithms.
Abstract: The initial process of identifying any available base station (BS) by a user equipment (UE) that wants to communicate is termed as cell search To ensure a reliable communication, any UE has to be synchronized with the BS both in time and frequency domains Cell search process is said to be complete once cell ID associated with long-term evolution (LTE) BS is decoded successfully This paper presents a series of cell search and synchronization algorithms, which efficiently estimated time and frequency offsets as well as cell ID The synchronization signals present in LTE, namely, primary synchronization signal (PSS) and secondary synchronization signal, that carry cell ID are critically exploited in the algorithms The aforementioned algorithms are classified into two modules, namely, module I and module II, based on their computation complexity In module I, a cyclic prefix (CP)-based maximum likelihood (ML) estimator is employed to obtain a coarse estimate of time and fractional frequency offset; however, the estimates are refined using synchronization signals A joint estimation of timing, integer frequency offset (IFO), and PSS ID (sector ID) is carried out in module II Both the modules operate on the cross-correlation approach of PSS with the received signal for obtaining timing and sector ID IFO as a part of module II is detected from a finite hypotheses set using synchronization signals Extensive simulations are carried out on a time-varying frequency-selective channel to analyze the performance of the algorithms
30 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...The process of attaining timing and frequency synchronization and cell ID of a BS is called as cell search [2]....
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01 Dec 2009
TL;DR: This paper provides a comprehensive review on state-of-the-art relaying strategies for LTE-Advanced and proposes a multi-hop aware channel-dependent scheduling mechanism to ameliorate the problem.
Abstract: The next-generation wireless network is envisaged to incorporate multi-hop ad hoc characteristics into cellular network infrastructure Multi-hop communication is viewed as an annexe to the cellular network infrastructure in order to increase coverage and capacity Currently, the Third Generation Partnership Project (3GPP) is investigating multi-hop functionality as one technical component for LTE-Advanced LTE-Advanced is the evolution of Long-Term Evolution (LTE) Even though multi-hop communication research has been ongoing for the past decades, research work on multi-hop cellular network is premature This paper serves to provide a comprehensive review on state-of-the-art relaying strategies for LTE-Advanced Two relaying strategies, namely amplify-and-forward and decode-and-forward are discussed The relaying strategies are qualitatively compared against a set of criteria The main conclusion drawn from the review is that each relaying strategy has its benefits and limitations Thus, LTE-Advanced could deploy a mixture of amplify-and-forward and decode-and-forward relays depending on the needs and scenarios We also discuss a new problem facing conventional channel-dependent scheduling mechanisms in LTE-Advanced with multi-hop links Consequently, we propose a multi-hop aware channel-dependent scheduling mechanism to ameliorate the problem
29 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...A channel-dependent scheduler [5] is one that takes into account the instantaneous radio-channel conditions in the scheduling decision....
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...LTE-Advanced is the next-generation of LTE (Long-Term Evolution) [5], which is set to provide data rates up to 1 Gb/s and 500 Mb/s in downlink and uplink, respectively....
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TL;DR: In some applications, performance trade-offs may be suitable, allowing cost-effective radar implementation, utilizing simplified receivers and partial matched filters with deterministic features of LTE, DVB, or DAB.
Abstract: We examine ambiguity functions of long-term evolution (LTE), digital video broadcast (DVB), and digital audio broadcast (DAB) signals. For passive radar, we propose exploiting deterministic signal features. Degradation in cross-ambiguity functions using deterministic features is characterized with respect to the full self-ambiguity function. In some applications, performance trade-offs may be suitable, allowing cost-effective radar implementation, utilizing simplified receivers (without a direct-path channel) and partial matched filters with deterministic features of LTE, DVB, or DAB.
29 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...Each PHY layer CID is uniquely defined by a primary and secondary synchronization signal (PSS and SSS) pair [23]....
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...However, if this was not the case, cell search procedures using the synchronization signals, PSS and SSS, could be performed as described in [23] to determine the CID....
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TL;DR: Simulations show that strategies based on two-way shared relaying with bidirectional channel inversion at the relay often perform best in terms of total system throughput while one-way techniques are promising when the relay power is low.
Abstract: Sharing a multiantenna relay among several sectors is a simple and cost-effective way to achieving much of the gains of local interference mitigation in cellular networks. Next generation wireless systems, such as ones based on the Third Generation Partnership Projects Long-Term Evolution Advanced, will employ universal frequency reuse to simplify network deployment. This strategy is anticipated to create significant cell-edge interference in the location of the shared relays, thus rendering advanced interference management strategies a necessity. This paper proposes several interference management strategies for the shared relays ranging from simple channel inversion at the relay, to more sophisticated techniques based on channel inversion in combination with partial and full base station coordination in the downlink and uplink. Given that the relay functionality influences total interference, both amplify-and-forward and decode-and-forward type relays are considered throughout. In this context, channel cancelation techniques are investigated for one-way relaying and also the spectrally efficient two-way relaying protocol. Simulations show that strategies based on two-way shared relaying with bidirectional channel inversion at the relay often perform best in terms of total system throughput while one-way techniques are promising when the relay power is low.
29 citations