González González, David
Total activity: 38
Research group
WiComTec - Wireless Communications Technologies
Department
Department of Signal Theory and Communications
E-mail
david.gonzalez.gonzalezestudiant.upc.edu
Contact details
UPC directory Open in new window

Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 38 of 38 results
  • A metaheuristic-based downlink power allocation for LTE/LTE-A cellular deployments

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Lee, Dong Seop
    Wireless networks
    Vol. 20, num. 6, p. 1369-1386
    DOI: 10.1007/s11276-013-0659-9
    Date of publication: 2014-08
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The explosive growth of cellular networks makes their deployment and maintenance more and more complex, time consuming, and expensive. Self-Organizing Networks have been recognized as a promising way to alleviate this problem by minimizing human intervention in such processes. This paper introduces a novel multiobjective framework, based on evolutionary optimization, aiming at improving network performance and users Quality of Service. By tuning the transmitted power at each cell, average intercell interference levels are minimized. The design of the proposed scheme is feasible for distributed implementations in Long Term Evolution (LTE) and LTE-Advanced networks and its operation is compatible with current specifications. The framework is able to provide effective network-specific optimization and obtained results show that gains in terms of network capacity and cell edge performance are 5 and 10 %, respectively. Energy savings always accompanied such enhancements with reductions up to 35 %.

  • A novel multiobjective framework for cell switch-off in dense cellular networks

     González González, David; Yanikomeroglu, Halim; Garcia Lozano, Mario; Ruiz Boque, Silvia
    IEEE International Conference on Communications
    p. 2647-2653
    Presentation's date: 2014-06-10
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The green communications paradigm has been receiving much attention in wireless networks in recent years. More specifically, in the context of cellular communications, the concept of Cell Switch Off (CSO) has been recognized as a promising approach to reduce the energy consumption. The need is expected to be pressing especially in the next decade with the increasing small cell deployment. However, the cell switch on/off decisions compounded by the resource allocation task in CSO constitute a highly challenging optimization problem due to the fact that this problem can be viewed as a generalized version of the resource allocation (scheduling) problem in the conventional cellular networks without CSO, which itself is already difficult. This paper introduces a novel framework to CSO based on multiobjective evolutionary optimization. The main contribution of this paper is that the proposed multiobjective framework takes the traffic behaviour in both space and time (known by operators) into account in the optimal cell switch on/off decision making which is entangled with the corresponding resource allocation task. The exploitation of this statistical information is done in a number of ways, including through the introduction of a weighted network capacity metric. This indicator prioritizes cells which are expected to have traffic concentration resulting in on/off decisions that achieve substantial energy savings in scenarios where traffic is highly unbalanced, without compromising the QoS. The proposed framework distinguishes itself from the CSO papers in the literature in two ways: 1) The number of cell switch on/off transitions as well as handoffs are minimized. 2) The computationally-heavy part of the algorithm is executed offline, which makes the real-time implementation feasible.

  • On the need for dynamic downlink intercell interference coordination for realistic long term evolution deployments

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    Wireless communications and mobile computing
    Vol. 14, num. 4, p. 409-434
    DOI: 10.1002/wcm.2191
    Date of publication: 2014-03
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Intercell interference is the main issue limiting the capacity of modern orthogonal frequency-division multiple access based cellular networks. Recently, extensive research work has been carried out in this field, and intercell interference coordination techniques have been recognized as key enablers of current (and future) cellular technologies. In this article, (i) a comprehensive survey of the most representative contributions is provided together with (ii) a generic methodology to measure their actual merit. The performance of several interference avoidance strategies has been evaluated both from system and user point of view in the context of a Long Term Evolution (LTE)-based network considering not only synthetic cellular scenarios but also realistic deployments. Our literature review indicates that there is a need for adaptive/operatorcustomizable low-complex intercell interference coordination (ICIC) schemes suitable for realistic LTE deployments. Results obtained by means of a comprehensive set of simulations corroborate and support this premise. In this article, it is shown that simultaneous gains in terms of spectral/energy efficiency and fairness can be achieved through dynamic mechanisms with respect to both classic hard reuse schemes and static ICIC techniques. Besides numerical results, a novel merit assessment methodology based on several weighted performance metrics is proposed. Our findings show that dynamic schemes outperform static techniques by around 20–35% in realistic deployments.

  • A novel multiobjective framework for cell switch-off in dense cellular networks

     González González, David; Yanikomeroglu, Halim; Garcia Lozano, Mario; Ruiz Boque, Silvia
    European Cooperation in the Fiel of Scientific and Techinical Research
    Presentation's date: 2014-02-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The green communications paradigm has been receiving much attention in wireless networks in recent years. More specifically, in the context of cellular communications, the concept of Cell Switch Off (CSO) has been recognized as a promising approach to reduce the energy consumption. The need is expected to be pressing especially in the next decade with the increasing small cell deployment. However, the cell switch on/off decisions compounded by the resource allocation task in CSO constitute a highly challenging optimization problem due to the fact that this problem can be viewed as a generalized version of the resource allocation (scheduling) problem in the conventional cellular networks without CSO, which itself is already difficult. This paper introduces a novel framework to CSO based on multiobjective evolutionary optimization. The main contribution of this paper is that the proposed multiobjective framework takes the traffic behaviour in both space and time (known by operators) into account in the optimal cell switch on/off decision making which is entangled with the corresponding resource allocation task. The exploitation of this statistical information in a number of ways, including through the introduction of a weighted network capacity metric that prioritizes cells which are expected to have traffic concentration, results in on/off decisions that achieve substantial energy savings, especially in dense deployments where traffic is highly unbalanced, without compromising the QoS. The proposed framework distinguishes itself from the CSO papers in the literature in two ways: 1) The number of cell switch on/off transitions as well as handoffs are minimized. 2) The computationally-heavy part of the algorithm is executed offline, which makes the real-time implementation feasible.

  • Aperiodic ICIC-oriented CSI reporting for LTE networks

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia
    DOI: 10.4018/978-1-4666-4888-3
    Date of publication: 2013-12-31
    Book chapter

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Broadband Wireless Access Networks for 4G: Theory, Application, and Experimentation presents the latest trends and research on mobile ad hoc networks, vehicular ad hoc networks, and routing algorithms which occur within various mobile networks. This publication smartly combines knowledge and experience from enthusiastic scholars and expert researchers in the area of wideband and broadband wireless networks. Students, professors, researchers, and other professionals in the field will benefit from this book¿s practical applications and relevant studies.

  • Improved component carrier selection considering MPR information for LTE-A uplink systems

     Lema Rosas, Maria Angel; Garcia Lozano, Mario; Ruiz Boque, Silvia; González González, David
    IEEE International Symposium on Personal Indoor and Mobile Radio Communications
    p. 2201-2206
    DOI: 10.1109/PIMRC.2013.6666507
    Presentation's date: 2013-09-09
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Carrier Aggregation (CA) is one of the key features introduced in LTE Release 10 to achieve higher levels of throughput. Two or more component carriers (CCs) are aggregated and user equipments (UEs) simultaneously transmit in more than one. The use of non-contiguous resource allocation in the uplink (UL) implies higher peak to average power ratio, so power de-rating is essential to avoid inter-modulation distortion and adjacent channel leakage-power ratio. CC selection is a key radio resource management procedure by which the eNB assigns UEs to CCs. While most CC selection algorithms deal with downlink, existing literature lacks efforts on UL CA. Moreover the mechanism is determinant on the UL performance. Given the UE power limitation, different criteria must be used in each link. This work proposes a novel CC selection algorithm that distinguishes between power limited and non-power limited UEs. In particular it is proposed to introduce information on maximum power reduction in selection decisions. Besides, UEs are not directly rejected if they are power limited, an acceptance margin is defined. This contains information on throughput variations between the allocation in several or just one CCs. This novel approach is contrasted with other CC selection techniques. Results show cell edge throughput improvements and the benefit of allowing bandwidth aggregation in a subset of power limited users.

    Carrier Aggregation (CA) is one of the key features introduced in LTE Release 10 to achieve higher levels of throughput. Two or more component carriers (CCs) are aggregated and user equipments (UEs) simultaneously transmit in more than one. The use of non-contiguous resource allocation in the uplink (UL) implies higher peak to average power ratio, so power de-rating is essential to avoid inter-modulation distortion and adjacent channel leakage-power ratio. CC selection is a key radio resource management procedure by which the eNB assigns UEs to CCs. While most CC selection algorithms deal with downlink, existing literature lacks efforts on UL CA. Moreover the mechanism is determinant on the UL performance. Given the UE power limitation, different criteria must be used in each link. This work proposes a novel CC selection algorithm that distinguishes between power limited and non-power limited UEs. In particular it is proposed to introduce information on maximum power reduction in selection decisions. Besides, UEs are not directly rejected if they are power limited, an acceptance margin is defined. This contains information on throughput variations between the allocation in several or just one CCs. This novel approach is contrasted with other CC selection techniques. Results show cell edge throughput improvements and the benefit of allowing bandwidth aggregation in a subset of power limited users.

  • Intercell interference coordination for the ePDCCH in LTE-advanced macrocellular deployments

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia
    International Conference on Wireless and Mobile Communications
    p. 200-209
    Presentation's date: 2013-07-25
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper investigates several schemes to improve the performance of the enhanced Physical Downlink Control Channel (ePDCCH) in Long Term Evolution Advanced (LTEA) networks by means of Intercell Interference Coordination (ICIC). Given the flexible design of the ePDCCH, based on frequency division multiplexing, static ICIC techniques such as Soft Frequency Reuse (SFR) can be applied and hence, performance degradations at cell edges can be avoided in contrast to its antecesor, the Physical Downlink Control Channel (PDCCH) in LTE. The study is focused in realistic/irregular deployments, where the amount of intercell interference received at different cells varies considerably making very difficult the task of homogenizing the performance of the ePDCCH over the coverage area. In order to address this problem, the proposed multiobjective scheme adjusts the configuration of SFR at cell level. The problem formulation includes several performance metrics including spectral efficiency, cell edge performance, consumption/amount of control resources and energy requirements. The results reveal that the proposed scheme is able to (1) reduce the average consumption of control resources and, (2) minimize energy needs without penalizing the capacity of data channels.

    Abstract—This paper investigates several schemes to improve the performance of the enhanced Physical Downlink Control Channel (ePDCCH) in Long Term Evolution Advanced (LTEA) networks by means of Intercell Interference Coordination (ICIC). Given the flexible design of the ePDCCH, based on frequency division multiplexing, static ICIC techniques such as Soft Frequency Reuse (SFR) can be applied and hence, performance degradations at cell edges can be avoided in contrast to its antecesor, the Physical Downlink Control Channel (PDCCH) in LTE. The study is focused in realistic/irregular deployments, where the amount of intercell interference received at different cells varies considerably making very difficult the task of homogenizing the performance of the ePDCCH over the coverage area. In order to address this problem, the proposed multiobjective scheme adjusts the configuration of SFR at cell level. The problem formulation includes several performance metrics including spectral efficiency, cell edge performance, consumption/ amount of control resources and energy requirements. The results reveal that the proposed scheme is able to (1) reduce the average consumption of control resources and, (2) minimize energy needs without penalizing the capacity of data channels.

  • Best Paper Award of the 9th International Conference on Wireless and Mobile Communications (ICWMC 2013)

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia
    Award or recognition

    View View Open in new window  Share

  • Power allocation for the PDCCH in LTE: a way to increase its capacity in realistic deployments

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia
    International Symposium on Wireless Personal Multimedia Communications
    Presentation's date: 2013-06-26
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In Long Term Evolution (LTE), the provision of Quality of Service (QoS) strongly depends on the ef¿ciency with which control resources are allocated. Unfortunately, the design of the control channel, the Physical Downlink Control Channel (PDCCH), is not ¿exible enough to support Intercell Interference Coordination (ICIC) and hence, its degradation at cell edges (a well known issue in LTE) severely jeopardizes system performance. This problem acquires especial relevance in realistic large scale deployments where Signal to Interference plus Noise Ratio (SINR) distributions are much worse than the ones predicted by means of hexagonal layouts. Thus, this paper investigates the challenge of improving SINR levels at cell edges in order to enhance the performance of the PDCCH. The proposed scheme adjusts the power allocated to the PDCCH at each cell in order to improve SINR distributions (minimizing the usage of control resources) and, due to its multiobjective nature, it considers several perspectives of the problem. The results show that gains in the order of 25% can be obtained in severely interfered cells while overall energy savings are around 50%.

    In Long Term Evolution (LTE), the provision of Quality of Service (QoS) strongly depends on the efficiency with which control resources are allocated. Unfortunately, the design of the control channel, the Physical Downlink Control Channel (PDCCH), is not flexible enough to support Intercell Interference Coordination (ICIC) and hence, its degradation at cell edges (a well known issue in LTE) severely jeopardizes system performance. This problem acquires especial relevance in realistic large scale deployments where Signal to Interference plus Noise Ratio (SINR) distributions are much worse than the ones predicted by means of hexagonal layouts. Thus, this paper investigates the challenge of improving SINR levels at cell edges in order to enhance the performance of the PDCCH. The proposed scheme adjusts the power allocated to the PDCCH at each cell in order to improve SINR distributions (minimizing the usage of control resources) and, due to its multiobjective nature, it considers several perspectives of the problem. The results show that gains in the order of 25% can be obtained in severely interfered cells while overall energy savings are around 50%.

  • Optimization of soft frequency reuse for irregular LTE macrocellular networks

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Lee, Dong Seop
    IEEE transactions on wireless communications
    Vol. 12, num. 5, p. 2410-2423
    DOI: 10.1109/TWC.2013.040213.121081
    Date of publication: 2013-05-29
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Best paper award of the 6th Joint IFIP Wireless and Mobile Networking Conference (WMNC'2013)

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Lema Rosas, Maria Angel; Lee, Dong Seop
    Award or recognition

    View View Open in new window  Share

  • Adapting fractional frequency reuse to realistic OFDMA cellular networks

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Lema, Maria A.; Lee, Dong Seop
    Wireless and Mobile Networking Conference
    p. 1-8
    DOI: 10.1109/WMNC.2013.6549020
    Presentation's date: 2013-04-23
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Effective intercell interference (ICI) mitigation has been identified as a key challenge for emerging OFDMA cellular technologies such as Long Term Evolution (LTE). In order to address this issue, mobile operators have adopted static Intercell Interference Coordination (ICIC) strategies, including Fractional Frequency Reuse (FFR), given their low complexity and easy implementation. However, recent results made evident the need for additional research efforts as the performance of FFR is poor in realistic cellular deployments. Thus, this paper presents a solution to this problem by means of a novel multiobjective optimization framework able to adapt FFR to any realistic cellular layout. By tuning the operational parameters of FFR at cell level, the proposed scheme succeeds in finding solutions outperforming reference schemes and baseline designs in terms of network capacity and cell edge performance while keeping energy consumption as low as possible.

  • Introduction of MPR information for enhanced multi-cluster scheduling in LTE-A uplink

     Lema Rosas, Maria Angel; Garcia Lozano, Mario; Ruiz Boque, Silvia; González González, David
    Wireless and Mobile Networking Conference
    p. 1-7
    DOI: 10.1109/WMNC.2013.6548997
    Presentation's date: 2013-04-23
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Against previous Long Term Evolution (LTE) re-leases, LTE-Advanced (LTE-A) allows the use of non-contiguous resource allocation in the uplink (UL). This feature leads to an increase in spectral efficiency thanks to link performance gains obtained from frequency diversity. At the same time noncontiguous allocations bring higher peak to average power ratio (PAPR) and so potentially higher inter-modulation and adjacent channel leakage-power ratio (ACLR). Power de-rating has been proposed as a means to avoid this problem and thus user equipments (UEs) must reduce their maximum transmitted power. However, the additional link loss on power limited UEs partially counteracts the gain brought by multi-cluster allocation. In this sense, this paper proposes to include Maximum Power Reduction (MPR) information in opportunistic scheduling decisions. The new scheduling proposal is able to determine whether multi-clustering leads to a net gain in instantaneous throughput or if localized allocation is preferred. Results show that this method improves cell throughput and allows making a smarter use of clustered transmission.

  • Improving soft frequency reuse for realistic OFDMA-based cellular deployments

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Lee, Dong Seop
    IEEE Global Communications Conference
    p. 5439-5445
    DOI: 10.1109/GLOCOM.2012.6503986
    Presentation's date: 2012-12-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Effective interference management is a technical challenge of utmost importance for emerging OFDMA-based technologies such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX). Static Intercell Interference Coordination techniques including Soft Frequency Reuse (SFR) have enjoyed acceptance among mobile operators as a solution to deal with this problem mainly due to their low complexity and easy implementability. However, recent results indicate that the performance of default SFR settings directly applied to realistic cellular deployments is quite suboptimal and hence optimization is mandatory. This paper addresses this issue by presenting a novel multiobjective framework able to achieve accurate fine tuning of SFR and hence, enhance system capacity and cell edge performance while reducing energy consumption.

  • Optimization of realistic full frequency reuse OFDMA-based cellular networks

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Lee, Dong Seop
    IEEE International Symposium on Personal Indoor and Mobile Radio Communications
    p. 1324-1329
    DOI: 10.1109/PIMRC.2012.6362552
    Presentation's date: 2012-09-09
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Nowadays mobile operators are planning and de- signing their mid/long term strategies based on new OFDMA- based cellular technologies such as LTE and WiMAX. Co-siting and re-utilization of existing facilities are within their roadmap in order to keep CAPEX as low as possible. Therefore, the optimization of OFDMA networks subject to fixed/previous (and usually suboptimal) coverage is mandatory. In addition, recently there is a great interest in reducing OPEX mainly by means of energy savings. This paper presents a novel multiobjective formulation aiming at improving the performance of OFDMA networks where full frequency reuse is employed. The proposed framework is flexible and results indicate that it is also effective as it improves both spectral efficiency and cell edge performance while it simultaneously reduces energy consumption.

  • Improving the Interplay between Periodic Channel State Information Feedback and Static Intercell Interference Coordination in LTE

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    Journal of communications
    Vol. 7, num. 9, p. 660-675
    DOI: 10.4304/jcm.7.9.660-675
    Date of publication: 2012-09-01
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Improving channel state information feedback for static Intercell interference coordination in LTE

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    IEEE International Conference on Communications
    p. 4893-4898
    DOI: 10.1109/ICC.2012.6363912
    Presentation's date: 2012-06-12
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Intercell Interference is the main issue limiting the capacity of modern OFDMA-based cellular networks. Recently, extensive research work has been focused on intercell interference coordination since it has been recognized as a key concept to achieve seamless levels of quality of service. Nevertheless, very often this problematic is addressed as a standalone issue. In this work, a novel channel state information feedback scheme is proposed aiming at improving the overall system performance when both channel state information and static interference coordination are jointly considered. By means of the proposed scheme, gains in terms of users throughput, cell edge performance and energy efficiency are achieved with respect to existing aperiodic LTE-based mechanisms without additional complexity.

  • On the role of downlink control information in the provision of QoS for NRT services in LTE

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    IEEE Vehicular Technology Conference
    p. 1-6
    DOI: 10.1109/VETECS.2012.6240095
    Presentation's date: 2012-05-07
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The provision of Quality of Service (QoS) to users of LTE networks depends to a large degree on the choice of an appropriate scheduling algorithm able to meet the requirements of mobile operators. Dynamic packet scheduling has been recognized as a key approach to maximize the utility of OFDMAbased systems due to its inherent ability to exploit the frequency selectiveness of wideband channels both in time and frequency domain. However, one of the main issues associated to dynamic scheduling is the high amount of signaling overhead required to provide users with resource allocation information. While the impact of control channel limitations on LTE VoIP capacity has been widely studied yet, tradeoffs associated to control channel usage and the provision of QoS for Non-Real Time (NRT) services has been basically omitted in current literature. In this paper, such tradeoffs have been addressed from several perspectives. Results show that the relationship between scheduling policies, offered levels of QoS (expressed in terms of guaranteed bit rates) and control channels capacity is not trivial and requires careful planning.

  • An analytical view of static intercell interference coordination techniques in OFDMA networks

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    IEEE Wireless Communications and Networking Conference
    p. 300-305
    DOI: 10.1109/WCNCW.2012.6215510
    Presentation's date: 2012-04-02
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents a novel methodology to assess the downlink performance of static intercell interference coordination techniques in the context of OFDMA-based cellular networks. In the last few years, interference mitigation techniques have been considered a research topic of utmost importance since intercell interference is the main issue limiting the capacity of modern cellular technologies such as LTE and WiMAX. The methodology presented in this paper should be understood not only as an analytical shortcut to foresee overall network interference conditions but also a mean to properly establish bounds to parameters associated to static intercell interference techniques operation. Moreover, the analysis allows to take into account both local large scale fading particularities and mobile operators’ preferences. In this sense, results show how the resulting set of preferred operational points is in general operatordependent and hence, the usefulness of the proposed framework is established.

  • A novel ICIC-oriented channel state information feedback scheme for aperiodic reporting in LTE

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    European Cooperative in Science And Technology
    Presentation's date: 2012-02-08
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In moderm OFDMA-based cellular networks, intercell interference is the main issue limiting the capacity of these systems. Recently, intensive research work has been focused on intercell interference coordination as it has been recognized as an important element to achieve seamless levels of quality of service. However, in most of the cases, this issue is addressed as a standalone issue. In this work, a novel channel state information feedback mechanism is proposed aiming at improving the system performance when static interference coordination techniques are also considered. By means of the proposed scheme, gains in terms of (1) users throughput, (2) cell edge performance and (3) energy efficiency are achieved with respect to existing aperiodic LTEbased mechanisms. Moreover, given the low complexity of the proposed solution, feasibility aspects are also discussed and a possible LTE implementation alternative is suggested.

  • Comunicaciones móviles eficientes basadas en redes heterogéneas y coordinación de interferencias

     Garcia Lozano, Mario; González González, David; Laya Romero, Andres Ernesto; Pérez Diaz de Cerio, David; Valenzuela Gonzalez, Jose Luis; Lema Rosas, Maria Angel; Ruiz Boque, Silvia; Alonso Zárate, Luis Gonzaga; Olmos Bonafé, Juan José
    Competitive project

     Share

  • Impact of downlink signaling capacity constraints on the provision of QoS in LTE

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    European Cooperative in Science And Technology
    Presentation's date: 2011-10-19
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Choosing appropriate scheduling policies is of utmost importance to deliver acceptable levels of Quality of Service (QoS) to users of LTE networks. This decision is not only conditioned by the type of services expected to be offered but also by targeted QoS levels properly said. In this sense, preliminary performance evaluations depend to a large degree on the accuracy with which relevant practical system limitations are modelled. In LTE, the capacity of control channels is clearly one of the most important issues. While the impact of control channel limitations on LTE VoIP capacity has been widely studied yet, tradeoffs associated to control channel usage and the provision of QoS for Non-Real Time (NRT) services has been basically omitted in current literature. In this paper, several experiments have been conducted to investigate such interplay from different points of view. Results show that the relationship between scheduling policies, offered levels of QoS (expressed in terms of guaranteed bit rates) and control channels capacity is not trivial and requires careful planning.

  • On the performance of static inter-cell interference coordination in realistic cellular layouts

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering (LNICST)
    Vol. 68, num. IV, p. 163-176
    DOI: 10.1007/978-3-642-21444-8_15
    Date of publication: 2011-05-25
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 3GPP LTE: hacia la 4G móvil

     Cardona, Narcís; Olmos Bonafé, Juan José; Garcia Lozano, Mario; Monserrat, José F.; Cabrejas Peñuelas, Jorge; Calabuig Soler, Daniel; Fernández Aguilella, Ana; González González, David; Martín-Sacristán Gandía, David; Ruiz Boque, Silvia
    Date of publication: 2011-04-01
    Book

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • On the performance of static inter-cell interference coordination in realistic cellular layouts

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    International ICST Conference on Mobile Networks and Management
    p. 1-14
    Presentation's date: 2010-09-23
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Effective interference management has been recognized by the industry and standardization bodies as a key enabler for 4G systems. This work is about static Inter-Cell Interference Coordination for OFDMA based cellular networks such as LTE. The majority of previous ICIC studies, both theoretical and simulation-based, have been conducted considering synthetic and/or small cellular layouts. In this work,the performance of static ICIC strategies in non-regular cellular layout is studied introducing some related RRM functions in the methodology. The overall performance assessment gives special attention to the efficiency vs. fairness tradeoff and the elements associated to it. Results show that the design of suitable and effective ICIC schemes for realistic cellular networks can not be done by simply extending classical approaches.

  • Static Inter-cell interference coordination techniques for LTE networks: a fair performance assessment

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    Lecture notes in computer science
    Vol. 6235, p. 211-222
    DOI: 10.1007/978-3-642-15428-7
    Date of publication: 2010-09-13
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper focuses in the analysis of 100% static and distributed inter-cell interference coordination techniques in the context of LTE networks. Several methods have been modeled and studied with the aim of deriving practical radio planning rules based on the joint effect of operational parameters and thresholds. The investigation places special emphasis on the efficiency vs. fairness tradeoff through a set of metrics that allow not only to evaluate the measurements from different points of view, but also to look at the effectiveness in radio resources usage. Results show that similar levels of spectral efficiency can be achieved by means of a proper and accurate network tuning. Moreover, interesting second order differences appear due to inherent features of each approach. These can be exploited depending on the particular network operator needs.

  • Access to the full text
    Performance evaluation of downlink interference coordination techniques in LTE networks  Open access

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Corvino, Virginia
    IEEE Vehicular Technology Conference
    p. 1-5
    DOI: 10.1109/VETECF.2010.5594544
    Presentation's date: 2010-09-09
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Performance evaluation of static inter-cell interference coordination in realistic cellular layouts

     González González, David; Garcia Lozano, Mario; Ruiz Boque, Silvia; Olmos Bonafé, Juan José
    European Cooperation in the Fiel of Scientific and Techinical Research
    p. 1-7
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Effective interference management has been recognized by the industry and standardization bodies as a key enabler for 4G systems. This work is about static Inter-Cell Interference Coordination for OFDMA based cellular networks such as LTE. The majority of previous ICIC studies, both theoretical and simulation-based, have been conducted considering synthetic and/or small cellular layouts. In this work, the performance of static ICIC strategies in non-regular cellular layout is studied introducing some related RRM functions in the methodology. The overall performance assessment gives special attention to the efficiency vs. fairness tradeoff and the elements associated to it. Results show that the design of suitable and effective ICIC schemes for realistic cellular networks can not be done by simply extending classical approaches.

  • Downlink Resource Allocation in LTE: Centralized vs. Distributed Approach

     González González, David; Corvino, Virginia; Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Garcia Lozano, Mario; Verdone, Roberto
    Joint COST2100 - NewCom++ workshop on "Radio Resource Assignment for LTE
    p. 1-7
    Presentation's date: 2009-09-30
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The 3GPP specifications for LTE leave many degrees of freedom to operators about how to design radio Resource Allocation (RA) strategies, and this is actually also allowed by the OFDM/OFDMA access technology. This means that RA can be faced from many points of view, motivating the research in several directions. In fact, it is clear that both centralized and distributed schemes appear as two valid alternatives to effectively manage radio resources from a multi-cell perspective in order to cope with the requirements imposed by applications and users by keeping inter-cell interference under control. The objective of this paper is to compare via simulation these two approaches under the same network conditions, in terms of users distribution, channel realizations, traffic models, taking into account a complex realistic scenario. Performance will be evaluated in terms of user throughput and power consumption, and some conclusions on advantages and drawbacks of each approach will be drawn.

  • Access to the full text
    Comparison of different distributed scheduling strategies for static/dynamic LTE scenarios  Open access

     Ruiz Boque, Silvia; Haro, Eva; González González, David; Garcia Lozano, Mario; Olmos Bonafé, Juan José
    European Meeting COST 2100. Pervasive Mobile & Ambient Wireless Communications
    Presentation's date: 2009-09-29
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • 2009SGR-1473 GRUP DE RECERCA EN TECNOLOGIES I COMUNICACIONS SENSE FILS, WICOMTEC

     Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Garcia Lozano, Mario; Valenzuela Gonzalez, Jose Luis; Alonso Zárate, Luis Gonzaga; Pérez Diaz de Cerio, David; Kartsakli, Elli; Upadhyay, Gaurav; González González, David
    Competitive project

     Share

  • Access to the full text
    Exponential effective SIR metric for LTE downlink  Open access

     Olmos Bonafé, Juan José; Serra Pages, Albert; Ruiz Boque, Silvia; Garcia Lozano, Mario; González González, David
    IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications
    p. 900-908
    DOI: 10.1109/PIMRC.2009.5449772
    Presentation's date: 2009-09-16
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    System Level Evaluation of LTE Networks with Semidistributed Intercell Interference Coordination  Open access

     González González, David; Ruiz Boque, Silvia; Garcia Lozano, Mario; Olmos Bonafé, Juan José; Serra Pages, Albert
    IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications
    p. 1497-1501
    DOI: 10.1109/PIMRC.2009.5449773
    Presentation's date: 2009-09-16
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    3GPP LTE is the evolution of UMTS which will make possible to deliver high quality multimedia services with an improved user experience. Since Radio Resource Management (RRM) has been recognized as a key point to successfully accomplish this target, the performance evaluation of a multi-cell resource allocation scheme applied to LTE downlink (DL) is presented in this paper. A semi-distributed RRM framework is discussed and evaluated from a system level viewpoint. Detailed link level simulations have also been carried out to properly back up the results.

  • Access to the full text
    Comparison of 3G-LTE DL scheduling strategies  Open access

     Ruiz Boque, Silvia; Haro, Eva; González González, David; Garcia Lozano, Mario; Olmos Bonafé, Juan José
    European Meeting COST 2100. Pervasive Mobile & Ambient Wireless Communications
    Presentation's date: 2009-05-18
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Exponential effective SIR link performance model for LTE downlink  Open access

     Olmos Bonafé, Juan José; Serra Pages, Albert; Ruiz Boque, Silvia; Garcia Lozano, Mario; González González, David
    European Meeting COST 2100. Pervasive Mobile & Ambient Wireless Communications
    Presentation's date: 2009-05-18
    Presentation of work at congresses

    Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Link and system level simulation of downlink LTE  Open access

     González González, David; Ruiz Boque, Silvia; Olmos Bonafé, Juan José; Garcia Lozano, Mario; Serra Pages, Albert
    European Meeting COST 2100. Pervasive Mobile & Ambient Wireless Communications
    Presentation's date: 2009-02-16
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    3GPP LTE is the evolution of the UMTS which will make possible to deliver next generation high quality multimedia services according to the users’ expectations. Since Radio Resource Management (RRM) has been recognized as a key point to successfully accomplish this target, the performance evaluation of a multi-cell resource allocation scheme applied to LTE downlink (DL) is presented in this paper. A semi-distributed and a fully-distributed RRM framework are compared on the basis of the obtained system throughput. Detailed link level simulations have also been carried out to properly back up the system level results.

  • Access to the full text
    Link level simulator for LTE downlink  Open access

     Olmos Bonafé, Juan José; Serra Pages, Albert; Ruiz Boque, Silvia; Garcia Lozano, Mario; González González, David
    7th European Meeting COST-2100. Pervasive Mobile & Ambient Wireless Communications
    Presentation's date: 2009-02-16
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    3GPP LTE is the evolution of UMTS which will make possible to deliver next generation high quality multimedia services according to the users’ expectations. The flexibility of the downlink OFDM radio interface with Adaptive Modulation and Coding (AMC), MIMO and HARQ plays a crucial role in achieving the low latency and high spectral efficiency promised by the new radio access standard. This paper presents a link level simulator for LTE downlink whose main purpose is to generate suitable look-up tables to interface with a system level simulator. The obtained results include curves of mean link level throughput for different AMC formats and MIMO configurations. The methodology for training the Exponential Effective SINR model is also described with an example.

  • INGENIERIA Y OPTIMIZACION DE RED CELULAR EN LONG TERM EVOLUTION DE 3GPP

     Ruiz Boque, Silvia; Garcia Lozano, Mario; Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; González González, David; Lema Rosas, Maria Angel; Olmos Bonafé, Juan José
    Competitive project

     Share