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
More filters
TL;DR: Simulation results demonstrated the efficacy of the proposed packet scheduling algorithm known as Novel Scheduling for usage in the downlink LTE-A in optimizing real-time multimedia performance for more mobile cellular users.
Abstract: Real-time multimedia applications are becoming increasingly popular among mobile cellular users. Given that Long Term Evolution-Advanced (LTE-A) which is an emerging mobile cellular standard needs to support these multimedia applications, packet scheduling is of paramount importance in LTE-A. This paper proposes a packet scheduling algorithm known as Novel Scheduling for usage in the downlink LTE-A. It takes channel quality, average throughput and packet delay into account when determining priority of each user. Simulation results demonstrated the efficacy of the proposed algorithm in optimizing real-time multimedia performance for more mobile cellular users.
7 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Maximum-rate (Max-Rate) [4], proportional fair (PF) [5], round-robin [6], and maximumlargest weight delay first (M-LWDF) [7] are a number of well-known packet scheduling algorithms proposed for use in the legacy mobile cellular systems....
[...]
08 Jun 2015
TL;DR: The proposed LSSK scheme introduces layer mapping and bit-mapping operations at the transmitter to achieve layered SSK modulation directly with low computation overhead and improves the spectrum efficiency of SSK system and outperforms other existing MIMO schemes.
Abstract: Space shift keying (SSK) modulation is an emerging transmission technique for multiple-input multiple-output (MIMO) wireless channels that exploits spatial domain to convey information. In this paper, we present a layered space shift keying (LSSK) modulation scheme to fully exploit spatial domain to transmit information bits, where a layered architecture is developed to achieve spatial multiplexing transmission in SSK system. With the layered structure, LSSK can achieve much higher spectrum efficiency than the conventional SSK modulation system. The proposed LSSK scheme introduces layer mapping and bit-mapping operations at the transmitter to achieve layered SSK modulation directly with low computation overhead. More precisely, leveraging the phase shift keying (PSK) modulation symbols previously known at the transceiver to identify different layers, multiple antennas are activated simultaneously to emit layered signals. The theoretical bit error probability of LSSK with optimal maximum likelihood (ML) detection is also derived in this paper. Results demonstrate that the proposed LSSK scheme substantially improves the spectrum efficiency of SSK system and outperforms other existing MIMO schemes.
7 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...The increasing requirements of high data rate and high spectrum efficiency have led to extensive research on multipleinput multiple-output (MIMO) techniques [1], [2]....
[...]
01 Dec 2012
TL;DR: The paper will review several of these problems and point to future research challenges in networked control, which bridges the traditional areas of control, communications and information theory.
Abstract: An emerging area of importance in control science is that of networked control. Within this framework one considers the impact of communication constraints on the performance of feedback control systems. The topic bridges the traditional areas of control, communications and information theory. In this paper we will focus on the practical application of these ideas. Perhaps unsurprisingly, a major area of application arises in the control of communication systems themselves since, here, the control commands and measurements are invariably sent over the same communication channels as are used for data. These channels are subject to imperfections including quantization, lost packets, random delays and decentralized architectures. Hence the associated control problems are quintessential examples of control subject to communication constraints. The paper will review several of these problems and point to future research challenges.
7 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...In the case of enhanced uplink (EUL) traffic [24], the scaling factor γ(k) is referred to as the power grant....
[...]
...A more detailed explanation of the operation of the uplink can be found in Chapter 10 of [24]....
[...]
...The 3G mobile communication system uses CDMA techniques to achieve broadband communication for many users in a cell, [23], [24]....
[...]
...The operation of these systems depends on a host of associated control loops, [23], [24]....
[...]
...In particular, power control is needed to compensate for time variations in the channel gains (known as fading) and to address the ‘near-far’ effect, whereby a user who is close to a base station overpowers one who is further away, [23], [24]....
[...]
05 Jul 2011
TL;DR: The capabilities of HSPA and LTE fixed wireless systems in terms of coverage, datarates, and capacity are discussed and evaluated and results indicate that in an Indian rural scenario with an inter-site distance of 40km, monthly data volumes are supported by HSPA on 10MHz.
Abstract: Fixed wireless systems are candidate solutions to connect billions of users not yet connected to the Internet. In this paper the capabilities of HSPA and LTE fixed wireless systems in terms of coverage, datarates, and capacity are discussed and evaluated. Results indicate that in an Indian rural scenario with an inter-site distance of 40km, monthly data volumes of 200MB per user together with a cell-edge datarate of 5Mbps are supported by HSPA on 10MHz (downlink, 1×2). For LTE monthly volumes of 430MB per user are reached in both downlink and uplink, together with cell-edge datarates of 5Mbps in downlink and 2Mbps in uplink. A key enabler is the use of directional rooftop terminal antennas.
7 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Regions not yet covered include rural areas with scattered small villages....
[...]
Dissertation•
14 Oct 2019
TL;DR: In this paper, the authors propose a framework for aplicacio conjunta of tecniques of reutilitzacio de frequencia (FR) and CoMP, respectively, to achieve a millor qualitat del servei (QoS) of forma homogenea.
Abstract: Actualment els sistemes 4G com Long Term Evolution (LTE) i LTE-Advanced (LTEA), proporcionen acces de banda ampla mobil per aplicacions que requereixen d’elevades taxes de transmissio de dades. Tot i aixi, any rere any la quantitat de trafic de dades transmeses via xarxes mobils creix a passes agegantades. Donada aquesta tesitura, les operadores mobils han de respondre a l’increment de la demanda d’aquest trafic, i a l’hora proporcionar una millor qualitat del servei (QoS) de forma homogenea sobre tota l’area de cobertura. En aquest context de rapida evolucio, apareixen nous reptes tecnics que han de ser resolts de manera eficas. Un factor que ha sigut reconegut com a clau en xarxes cel·lulars basades en orthogonal frequency division multiple access (OFDMA) es la gestio d’interferencies. Es un fet ben conegut que la utilitzacio d’un factor de reutilitzacio baix permet una elevada eficiencia espectral pero a costa d’una distribucio de QoS que no es uniforme a la xarxa, ja que depen de la posicio de l’usuari: els usuaris situats aprop de les estacions base (BSs) experimenten unes prestacions molt superiors als usuaris localitzats lluny de les BS. Per tant, el rendiment en els limits de la cel·la es veu molt penalitzat i suposa un problema important a resoldre en LTE i LTE-A. Amb l’objectiu de mitigar aquests efectes apareixen tecniques de coordinacio d’interferencies entre cel·les (ICIC) que engloben les estrategies que tenen com objectiu la minimitzacio de la interferencia intercel·lular (ICI), especialment, als extrems cel·lulars.
En aquest context es presenten dos grans grups de tecniques ICIC, les anomenades tecniques de reutilitzacio de frequencia (FR) que tracten de controlar les interferencies entre cel·lules adjacents, i les conegudes com tecniques de transmissio multipunt coordinada (CoMP), que es basen en la introduccio d’esquemes de precodificacio mitjancant els quals la informacio d’un usuari es transmesa des de diverses BSs de manera simultania.
Ambdues estrategies estan dissenyades per millorar el rendiment global de les xarxes i essent utilitzades en les darreres actualitzacions d’LTE i estan destinades a jugar un paper encara mes important dins dels estandards del 5G. La contribucio presentada en aquesta tesis doctoral inclou l’estudi del funcionament i disseny conjunt de tecniques FR i CoMP, proposant un framework per l’aplicacio conjunta d’ambdues tecniques en xarxes reals (topologicament irregulars) i optimitzacio del seu disseny respecte a diverses metriques de rendiment.
Despres d’un primer capitol introductori, s’introdueixen els conceptes de FR i CoMP.
Un cop presentades ambdues estrategies es defineix un framework on es possible comparar diferents tecniques CoMP amb l’objectiu de seleccionar la mes adient per ser emprada en els altres capitols de la tesis. Mes endavant es realitza una primera optimitzacio d’aquestes tecniques sobre xarxes sintetiques tenint en compte diverses metriques d’avaluacio.
Aquestes metodologies, empero, son dificils d’aplicar quan s’introdueixen irregularitats en la topologia de la xarxa motivant la proposta d’una estrategia basada en dues passes per combinar tecniques CoMP amb FR sobre xarxes irregulars. La primera fase serveix per indicar com s’han d’agrupar els sectors de les estacions base per cooperar entre si. La segona fase resol la forma en la qual s’ha de repartir l’espectre frequencial entre les diferents estacions base. Un cop presses aquestes dues decisions inicials a nivells de disseny de la xarxa es presenta un innovador model matematic que permet obtenir aproximacions de les metriques de rendiment de la xarxa, la dependencia respecte dels parametres del sistema es molt semblant a l’experimentada per les metriques reals. Finalment es proposa un proces d’optimitzacio emprant els models matematics introduits anteriorment i recolzant-se en l’us d’algoritmes evolutius multiobjectiu que permet l’estimacio optima dels parametres de FR per a un determinat perfil de rendiment.
7 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Conforme a la mayoría de estándares celulares [94] se puede suponer que cada sector de cada BS tiene disponible una señal piloto que puede ser usada para estimar, en una localización dada, la potencia de señal recibida que se obtendría tanto desde cualquier sector de una BS transmisora como desde cualquiera de las BSs interferentes cercanas....
[...]