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
Citations
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08 Dec 2008
TL;DR: The dimensioning of the backhaul resources on the ATM-based Iub interface in UMTS HSUPA networks is discussed, which estimates the required backhaul bandwidth as a function of user QoS requirements and discusses the impact when including HSDPA traffic on the downlink.
Abstract: HSUPA (High Speed Uplink Packet Access) is introduced by the 3GPP Release 6 to enhance the UMTS uplink with higher data rates, reduced latency and increased capacity. This paper discusses the dimensioning of the backhaul resources on the ATM-based Iub interface in UMTS HSUPA networks. The main focuses of this paper is to (1) analyze the important factors that have influence on the transport network dimensioning and further investigate their impacts; (2) estimate the required backhaul bandwidth as a function of user QoS requirements; (3) discuss the impact when including HSDPA traffic on the downlink. In addition, this paper also provides insights of HSUPA air interface given diverse user applications as well as different number of users within one cell. The investigations and dimensioning are based on simulations.
8 citations
Dissertation•
01 Jan 2011
TL;DR: Tese de doutoramento. Faculdade de Engenharia. Universidade do Porto, Portugal as discussed by the authors, 2011. André et al., 2011.
Abstract: Tese de doutoramento. Engenharia Electrotecnica e de Computadores. Universidade do Porto. Faculdade de Engenharia. 2011
8 citations
TL;DR: The experiment reveals that the dual-functional approach can achieve comparable BER performance with pure communication-based solutions while achieving fine sensing beampatterns and realistic sensing functionality simultaneously.
Abstract: The integration of sensing and communication (ISAC) functionalities have recently gained significant research interest as a hardware-, power-, spectrum- and cost- efficient solution. This experimental work implements a dual-functional sensing and communication framework where a single radiation waveform, either omnidirectional or directional, can realize both sensing and communication functions. We design an orthogonal frequency division multiplexing (OFDM) based multi-user multiple input multiple output (MIMO) software-defined radio (SDR) testbed to validate the dual-functional model. We carry out over-the-air experiments to investigate the optimal trade-off factor to balance the performance for both functions. On the communication side, we obtain bit error rate (BER) results from the testbed to show the communication performance using the dual-functional waveform. On the sensing performance, we measure the output beampatterns of our transmission to examine their similarity to simulation based beampatterns. We also implement a sensing experiment to realize activity detection functions. Our experiment reveals that the dual-functional approach can achieve comparable BER performance with pure communication-based solutions while achieving fine sensing beampatterns and realistic sensing functionality simultaneously.
8 citations
05 Sep 2008
TL;DR: An experimental evaluation of the spectral efficiencies achievable in MBSFN and conventional MBMS is presented to assess whether it is expedient to enhance WCDMA by MBS FN.
Abstract: Multimedia broadcast/multicast services (MBMS) have been introduced for WCDMA in release 6. At a given coverage, the efficiency of conventional MBMS is limited by low SNR users as, e.g., users located close to a cell edge, which are typically suffering from bad channel and inter-cell interference conditions. As a means to mitigate the situations of such users, multicast/broadcast single frequency network (MBSFN) operation has recently been specified in the Third Generation Partnership Project (3GPP) as an enhancement of MBMS. In WCDMA downlinks as considered here, MBSFN operation refers to the coherent use of a single common scrambling code and the same spreading codes to simultaneously broadcast identical MBMS channels in a number of cells that form an MBMS cluster. Through this, the users receive the signals from the cluster of MBSFN cells as one single signal over a joint radio channel, which exchanges inter-cell interference by constructive multi-path signals. This can be exploited by advanced receivers to yield impressive receiver output SNR gains as compared to conventional MBMS. This paper presents an experimental evaluation of the spectral efficiencies achievable in MBSFN and conventional MBMS. The results help to assess whether it is expedient to enhance WCDMA by MBSFN.
8 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Due to unavoidable runtime differences between the different BSs and users, these joint channel impulse responses tend to be much longer than those in a typical single-link scenario and, consequently, multi-path interference is spread over a large time window [3]....
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21 Oct 2019
TL;DR: This study presents the first look at overload estimation through the analysis of unencrypted broadcast messages, and shows that an upsurge in broadcast reject and cell barring messages can accurately detect an increase in network overload.
Abstract: Over 87% of US mobile wireless subscriptions are currently held by LTE-capable devices [34]. However, prior work has demonstrated that connectivity may not equate to usable service. Even in well-provisioned urban networks, unusually high usage (such as during a public event or after a natural disaster) can lead to overload that makes the LTE service difficult, if not impossible to use, even if the user is solidly within the coverage area. A typical approach to detect and quantify overload on LTE networks is to secure the cooperation of the network provider for access to internal metrics. An alternative approach is to deploy multiple mobile devices with active subscriptions to each mobile network operator (MNO). Both approaches are resource and time intensive. In this work, we propose a novel method to estimate overload in LTE networks using only passive measurements, and without requiring provider cooperation. We use this method to analyze packet-level traces for three commercial LTE service providers, T-Mobile, Verizon and AT&T, from several locations during both typical levels of usage and during public events that yield large, dense crowds. This study presents the first look at overload estimation through the analysis of unencrypted broadcast messages. We show that an upsurge in broadcast reject and cell barring messages can accurately detect an increase in network overload.
8 citations