Telecom ParisTech

Displaying 1-40 of 58 results

  • White Papers // Apr 2012

    Optimal Capacity Relay Node Placement in a Multi-Hop Network on a Line

    The authors use information theoretic achievable rate formulas for the multi-relay channel to study the problem of optimal placement of relay nodes along the straight line joining a source node and a destination node. The achievable rate formulas that they utilize are for full-duplex radios at the relays and decode-and-forward...

    Provided By Telecom ParisTech

  • White Papers // Apr 2012

    Robust Methods for LTE and WiMAX Dimensioning

    This paper proposes an analytic model for dimensioning OFDMA based networks like WiMAX and LTE systems. In such a system, users require a number of sub-channels which depends on their SNR, hence of their position and the shadowing they experience. The system is overloaded when the number of required sub-channels...

    Provided By Telecom ParisTech

  • White Papers // Nov 2011

    Internet and the Erlang Formula

    The authors demonstrate that the Internet has a formula linking demand, capacity and performance that in many ways is the analogue of the Erlang loss formula of telephony. Surprisingly, this formula is none other than the Erlang delay formula. It provides an upper bound on the probability a flow of...

    Provided By Telecom ParisTech

  • White Papers // Nov 2011

    Caching Performance of Content Centric Networks Under Multi-Path Routing (and More)

    This paper addresses the performance evaluation of Content Centric Networks (CCN). Focusing on a realistic YouTube-like catalog, the authors conduct a very thorough simulation study of the main system performance, consider several ingredients such as network topology, multi-path routing, content popularity, caching decisions and replacement policies. Summarizing their main results,...

    Provided By Telecom ParisTech

  • White Papers // Nov 2011

    A Dive Into the Caching Performance of Content Centric Networking

    Content Centric Networking (CCN) is a promising architecture for the diffusion of popular content over the Internet. Radically departing from content-oblivious IP networks, CCN pushes content-awareness down the networking stack. By relying on in-network caching, CCN reduces the overall network load, as requests no longer need to travel until the...

    Provided By Telecom ParisTech

  • White Papers // Oct 2011

    Experimental Assessment of BitTorrent Completion Time in Heterogeneous TCP/uTP Swarms

    BitTorrent, one of the most widespread file sharing P2P applications, recently got rid of TCP by introducing an application-level congestion control protocol named uTP. The aim of this new protocol is to efficiently use the available link capacity, while minimizing its interference with the rest of user traffic (e.g., Web,...

    Provided By Telecom ParisTech

  • White Papers // Jul 2011

    Local Failure Detection and Diagnosis in Large Sensor Networks

    In this paper, the joint fluctuations of the extreme eigenvalues and eigenvectors of a large dimensional sample covariance matrix are analyzed when the associated population covariance matrix is a finite-rank perturbation of the identity matrix, which corresponds to a so-called spiked model in random matrix theory. The asymptotic fluctuations, as...

    Provided By Telecom ParisTech

  • White Papers // Jun 2011

    The Impact of UTP on BitTorrent Completion Time

    BitTorrent, one of the most widespread file sharing P2P applications, recently introduced uTP, an application-level congestion control protocol which aims to efficiently use the available link capacity, while avoiding to interfere with the rest of user traffic (e.g., Web, VoIP and gaming) sharing the same access bottleneck. Research on uTP...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Adaptive Probabilistic Flooding for Multipath Routing

    In this paper, the authors develop a distributed source routing algorithm for topology discovery suitable for ISP transport networks that is however inspired by opportunistic algorithms used in ad hoc wireless networks. They propose a plug-and-play control plane, able to find multiple paths toward the same destination, and introduce a...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Relays-Enhanced LTE-Advanced Networks Performance Studies

    This paper proposes a study on the performance of multi-hop relays networks. The authors demonstrate the importance of the relays for coverage and capacity enhancement and study how the number of relays and their position inside the cell impact the performance, and how an efficient relay location scheme can guarantee...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Dynamic System Performance of SISO, MISO and MIMO Alamouti Schemes

    MIMO systems have been deeply investigated during the last years. They have been proven to achieve better performance in terms of capacity through the multiplexing gain and in terms of reliability through to the diversity gain. Tradeoffs between these two promised gains have been established. Space-time codes were introduced as...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    How to Set the Fractional Power Control Compensation Factor in LTE?

    The uplink power control procedure in Long Term Evolution (LTE) cellular networks is made of an open-loop part and a closed loop part. In this paper, the authors focus on the former and study the compensation factor of the related Fractional Power Control (FPC) scheme. In particular, they propose a...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Fine-Grained Behavioral Classification in the Core: The Issue of Flow Sampling

    This work studies the impact of flow sampling on the accuracy of behavioral traffic classification. More precisely, the authors consider the case where the traffic classification engine is located at different vantage points of the network. Usually, behavioral classification is performed close to the user access network - where all...

    Provided By Telecom ParisTech

  • White Papers // Mar 2011

    Deriving Dynamics of Web Pages: A Survey

    The World Wide Web is dynamic by nature: content is continuously added, deleted, or changed, which makes it challenging for Web crawlers to keep up-to-date with the current version of a Web page, all the more so since not all apparent changes are significant ones. The authors review major approaches...

    Provided By Telecom ParisTech

  • White Papers // Mar 2011

    ModelNet-TE: An Emulation Tool for the Study of P2P and Traffic Engineering Interaction Dynamics

    In the Internet, P2P application performance may be determined by the interaction of two independent dynamics: on the one hand, by the end-to-end control policies applied at the P2P application layer (L7); on the other hand, by Traffic Engineering (TE) decisions taken at the network level (L3). To study L7/L3...

    Provided By Telecom ParisTech

  • White Papers // Jan 2011

    Identifying Key Features for P2P Traffic Classification

    Many researchers have recently dealt with P2P traffic classification, mainly because P2P applications are continuously growing in number as well as in traffic volume. Additionally, in response to the shift of the operational community from packet-level to flow-level monitoring witnessed by the widespread use of NetFlow, a number of behavioral...

    Provided By Telecom ParisTech

  • White Papers // Dec 2010

    Lattice Code Design for the Rayleigh Fading Wiretap Channel

    It has been shown recently that coding for the Gaussian Wiretap Channel can be done with nested lattices. A fine lattice intended to the legitimate user must be designed as a usual lattice code for the Gaussian Channel, while a coarse lattice is added to introduce confusion at the eavesdropper,...

    Provided By Telecom ParisTech

  • White Papers // Dec 2010

    Modeling, Querying, and Mining Uncertain XML Data

    This paper deals with data mining in uncertain XML data models, this uncertainty typically coming from imprecise automatic processes. The authors first review the literature on modeling uncertain data, starting with well-studied relational models and moving then to their semi-structured counterparts. They focus on a specific probabilistic XML model, that...

    Provided By Telecom ParisTech

  • White Papers // Nov 2010

    Assessing the Impact of Signaling on the QoE of Push-Based P2P-TV Diffusion Algorithms

    Internet video and Peer-To-Peer TeleVision (P2P-TV) are attracting more and more users: chances are that P2P-TV is going to be the next Internet killer application. In recent years, valuable effort has been devoted to the problems of chunk-scheduling and overlay management in P2P-TV systems. However, many interesting P2P-TV proposals have...

    Provided By Telecom ParisTech

  • White Papers // Oct 2010

    Rethinking Low Extra Delay Background Transport Protocols

    BitTorrent has recently introduced LEDBAT, a novel application-layer congestion control protocol for data exchange. The protocol design starts from the assumption that network bottlenecks are at the access of the network, and that thus user traffic competes creating self-inducing congestion. To relieve from this phenomenon, LEDBAT is designed to quickly...

    Provided By Telecom ParisTech

  • White Papers // Oct 2010

    A Survey of Green Networking Research

    Reduction of unnecessary energy consumption is becoming a major concern in wired networking, because of the potential economical benefits and of its expected environmental impact. These issues, usually referred to as "Green networking", relate to embedding energy-awareness in the design, in the devices and in the protocols of networks. In...

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    Average SIR Estimation in Cellular Networks With Best Server Policy

    The evaluation of the Signal to Interference Ratio (SIR) in cellular networks is of primary importance for network dimensioning. For static studies, which evaluate cell capacity and coverage, as well as for dynamic studies, which consider arrivals and departures of Mobile Stations (MSs), the SIR is always an important input....

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    An Efficient Tabu Search DSA Algorithm for Heterogeneous Traffic in Cellular Networks

    In this paper, the authors propose and analyze a TS (Tabu Search) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They consider a scenario where cellular operators share a common access band, and they focus on the strategy of one operator providing packet services to the end-users. The authors...

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    Greening the Internet Surf: Experimental Measurements of Web Power-Consumption

    Nowadays, Web and cloud services have become irreplaceable cornerstones of both enterprise productivity and user entertainment. While the fact that Web permeates many aspects of the peoples lives is no secret to anyone, the power-consumption induced by these services is not obvious either. In this paper, the authors gauge the...

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    An Analytical Model for Evaluating Outage and Handover Probability of Cellular Wireless Networks

    The authors consider stochastic cellular networks where base stations locations form a homogenous Poisson point process and each mobile is attached to the base station that provides the best mean signal power. The mobile is in outage if the SINR falls below some threshold. The handover decision has to be...

    Provided By Telecom ParisTech

  • White Papers // Jul 2010

    A Tabu Search DSA Algorithm for Reward Maximization in Cellular Networks

    In this paper, the authors present and analyze a Tabu Search (TS) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They study a mono-operator case where the operator is providing packet services to the end-users. The objective of the cellular operator is to maximize its reward while taking into...

    Provided By Telecom ParisTech

  • White Papers // Jun 2010

    A Fluid Model for Performance Analysis in Cellular Networks

    In this paper, the authors propose a new framework to study the performance of cellular networks using a fluid model and they derive from this model analytical formulas for interference, outage probability, and spatial outage probability. The key idea of the fluid model is to consider the discrete Base Stations...

    Provided By Telecom ParisTech

  • White Papers // May 2010

    Negative Databases for Biometric Data

    Negative databases - negative representations of a set of data - have been introduced in 2004 to protect the data they contain. Today, no solution is known to constitute biometric negative databases. This is surprising as biometric applications are very demanding of such protection for privacy reasons. The main difficulty...

    Provided By Telecom ParisTech

  • White Papers // May 2010

    On the Impact of Sampling on Traffic Monitoring and Analysis

    Due to significant advances in transmission technology and to the corresponding increase of link rates, traffic sampling is becoming a normal way of operation in traffic monitoring. Given this trend, in this paper the authors aim to assess the impact of the sampling on a wide range of tasks which...

    Provided By Telecom ParisTech

  • White Papers // Apr 2010

    Multiple Access Mechanisms With Performance Guarantees for Ad-Hoc Networks

    This paper bears on the design and the quantitative evaluation of MAC mechanisms for wireless ad-hoc networks with performance guarantees. By this, the authors mean mechanisms where each accepted connection obtains a minimum rate or equivalently a minimum SINR level - which is not guaranteed by CSMA/CA - and which...

    Provided By Telecom ParisTech

  • White Papers // Apr 2010

    A Hands-On Assessment of Transport Protocols With Lower Than Best Effort Priority

    Last year, the official BitTorrent client switched to LEDBAT, a new congestion control algorithm targeting a lower-than Best Effort transport service. In this paper, the authors study this new protocol through packet-level simulations, with a special focus on a performance comparison with other lower-than Best Effort protocols such as TCP-LP...

    Provided By Telecom ParisTech

  • White Papers // Mar 2010

    Practical Improvements of Profiled Side-Channel Attacks on a Hardware Crypto-Accelerator

    This paper investigates the relevance of the theoretical framework on profiled side-channel attacks presented by F.-X. Standaert et al. at Eurocrypt 2009. The analyses consist in a case-study based on side channel measurements acquired experimentally from a hardwired cryptographic accelerator. Therefore, with respect to previous formal analyses carried out on...

    Provided By Telecom ParisTech

  • White Papers // Feb 2010

    LEDBAT: The New BitTorrent Congestion Control Protocol

    A few months ago, BitTorrent developers announced that the transfer of torrent data in the official client was about to switch to a new application-layer congestion-control protocol using UDP at the transport-layer. This announcement immediately raised an unmotivated buzz about a new, imminent congestion collapse of the whole Internet. As...

    Provided By Telecom ParisTech

  • White Papers // Feb 2010

    Outage Probability in a Multi-Cellular Network Using Alamouti Scheme

    In this paper the authors analyze the performance of a downlink single user multi-cellular Multiple Inputs Single Output (MISO) system using the Alamouti code. The authors derive, for the first time, an analytical expression of the cumulative distribution function of the output Signal to Interference plus Noise Ratio (SINR) or...

    Provided By Telecom ParisTech

  • White Papers // Feb 2010

    Limiting Power Transmission of Green Cellular Networks: Impact on Coverage and Capacity

    Reducing power transmission is of primary importance in future green cellular networks. First of all, the induced reduction of the interference encourages the deployment of opportunistic radios in the same spectrum. Then, it directly implies a reduction of the energy consumption. At last, electric field radiations reduction mitigates the potential...

    Provided By Telecom ParisTech

  • White Papers // Jan 2010

    Yes, We LEDBAT: Playing With the New BitTorrent Congestion Control Algorithm

    The official BitTorrent client is using a new congestion-control protocol for data transfer, implemented at the application layer and built over UDP at the transport-layer: this new protocol undergoes the name of LEDBAT, for Low Extra Delay Background Transport. In this paper, the authors study different flavors of the LEDBAT...

    Provided By Telecom ParisTech

  • White Papers // Jan 2010

    An Efficient Analytical Model for the Dimensioning of WiMAX Networks Supporting Multi-Profile Best Effort Traffic

    This paper tackles the challenging task of developing a simple and accurate analytical model for performance evaluation of WiMAX networks. The need for accurate and fast-computing tools is of primary importance to face complex and exhaustive dimensioning issues for this promising access technology. In this paper, the authors present a...

    Provided By Telecom ParisTech

  • White Papers // Jan 2010

    Joint Impact of Pathloss Shadowing and Fast Fading - An Outage Formula for Wireless Networks

    In this paper, the authors analyse the joint impact of pathloss, shadowing and fast fading on wireless networks. Taking into account the pathloss and the shadowing, they first express the SINR distribution of a mobile located at a given distance from its serving Base-Station (BS). The moments of this distribution...

    Provided By Telecom ParisTech

  • White Papers // Oct 2009

    Achieving Frequency Reuse 1 in WiMAX Networks With Beamforming

    In this paper, the authors examine the performance of adaptive beamforming in connection with three different subcarrier permutation schemes (PUSC, FUSC and AMC) in WiMAX cellular network with frequency reuse 1. Performance is evaluated in terms of radio quality parameters and system throughput. They show that organization of pilot subcarriers...

    Provided By Telecom ParisTech

  • White Papers // Sep 2009

    Distributed Detection/localization of Change-Points in High-Dimensional Network Traffic Data

    The authors propose a novel approach for distributed statistical detection of change-points in high-volume network traffic. They consider more specifically the task of detecting and identifying the targets of Distributed Denial of Service (DDoS) attacks. The proposed algorithm, called DTopRank, performs distributed network anomaly detection by aggregating the partial information...

    Provided By Telecom ParisTech

  • White Papers // Mar 2011

    ModelNet-TE: An Emulation Tool for the Study of P2P and Traffic Engineering Interaction Dynamics

    In the Internet, P2P application performance may be determined by the interaction of two independent dynamics: on the one hand, by the end-to-end control policies applied at the P2P application layer (L7); on the other hand, by Traffic Engineering (TE) decisions taken at the network level (L3). To study L7/L3...

    Provided By Telecom ParisTech

  • White Papers // Jan 2010

    Yes, We LEDBAT: Playing With the New BitTorrent Congestion Control Algorithm

    The official BitTorrent client is using a new congestion-control protocol for data transfer, implemented at the application layer and built over UDP at the transport-layer: this new protocol undergoes the name of LEDBAT, for Low Extra Delay Background Transport. In this paper, the authors study different flavors of the LEDBAT...

    Provided By Telecom ParisTech

  • White Papers // Feb 2010

    LEDBAT: The New BitTorrent Congestion Control Protocol

    A few months ago, BitTorrent developers announced that the transfer of torrent data in the official client was about to switch to a new application-layer congestion-control protocol using UDP at the transport-layer. This announcement immediately raised an unmotivated buzz about a new, imminent congestion collapse of the whole Internet. As...

    Provided By Telecom ParisTech

  • White Papers // May 2010

    On the Impact of Sampling on Traffic Monitoring and Analysis

    Due to significant advances in transmission technology and to the corresponding increase of link rates, traffic sampling is becoming a normal way of operation in traffic monitoring. Given this trend, in this paper the authors aim to assess the impact of the sampling on a wide range of tasks which...

    Provided By Telecom ParisTech

  • White Papers // Apr 2010

    A Hands-On Assessment of Transport Protocols With Lower Than Best Effort Priority

    Last year, the official BitTorrent client switched to LEDBAT, a new congestion control algorithm targeting a lower-than Best Effort transport service. In this paper, the authors study this new protocol through packet-level simulations, with a special focus on a performance comparison with other lower-than Best Effort protocols such as TCP-LP...

    Provided By Telecom ParisTech

  • White Papers // Aug 2009

    News From the Internet Congestion Control World

    A few months ago, the BitTorrent developers announced that the transfer of torrent data in the official client was about to switch to uTP, an application-layer congestion-control protocol using UDP at the transport-layer. This announcement immediately raised an unmotivated buzz about a new, imminent congestion collapse of the whole Internet....

    Provided By Telecom ParisTech

  • White Papers // Jun 2009

    Gauging the Network Friendliness of P2P Applications

    This paper presents a software tool whose aim is to quantify the level of network awareness and friendliness of the currently deployed Internet P2P applications. Considering such systems as black-boxes, the authors passively measure the traffic they generate and they gather, by means of both passive inference and active-probing techniques,...

    Provided By Telecom ParisTech

  • White Papers // Mar 2009

    Do Next Generation Networks Need Path Diversity?

    The authors have currently reached a phase where big shifts in the network traffic might impose to rethink the design of current architectures, and where new technologies, being pushed into market, will act as enabler of such changes. Taking into account the current scenario and its likely evolution as well,...

    Provided By Telecom ParisTech

  • White Papers // Apr 2010

    Multiple Access Mechanisms With Performance Guarantees for Ad-Hoc Networks

    This paper bears on the design and the quantitative evaluation of MAC mechanisms for wireless ad-hoc networks with performance guarantees. By this, the authors mean mechanisms where each accepted connection obtains a minimum rate or equivalently a minimum SINR level - which is not guaranteed by CSMA/CA - and which...

    Provided By Telecom ParisTech

  • White Papers // Jun 2009

    Robust Regression for Minimum-Delay Load-Balancing

    By providing origin-destination pairs with several possible paths, Dynamic Load-Balancing has been shown to obtain excellent results in terms of robustness and effective resource usage. In these dynamic schemes, paths are defined a priori, and the portion of traffic routed through each path is (typically) adjusted so that the sum...

    Provided By Telecom ParisTech

  • White Papers // Feb 2009

    Routing Games for Traffic Engineering

    Current data network scenario makes Traffic Engineering (TE) a very challenging task. The ever growing access rates and new applications running on end-hosts result in more variable and unpredictable traffic patterns. By providing origin-destination pairs with several possible paths, load-balancing has proved itself an excellent tool to face this uncertainty....

    Provided By Telecom ParisTech

  • White Papers // Mar 2009

    Minimum-Delay Load-Balancing Through Non-Parametric Regression

    Network convergence and new applications running on end-hosts result in increasingly variable and unpredictable traffic patterns. By providing origin-destination pairs with several possible paths, load-balancing has proved itself an excellent tool to face this uncertainty. Formally, load-balancing is defined in terms of a convex link cost function of its load,...

    Provided By Telecom ParisTech

  • White Papers // Feb 2009

    A Fair and Dynamic Load-Balancing Mechanism

    The current data network scenario makes Traffic Engineering (TE) a very challenging task. The ever-growing access rates and new applications running on end-hosts result in more variable and un-predictable traffic patterns. By providing Origin-Destination (OD) pairs with several possible paths, load-balancing has proven itself an excellent tool to face this...

    Provided By Telecom ParisTech

  • White Papers // May 2010

    Negative Databases for Biometric Data

    Negative databases - negative representations of a set of data - have been introduced in 2004 to protect the data they contain. Today, no solution is known to constitute biometric negative databases. This is surprising as biometric applications are very demanding of such protection for privacy reasons. The main difficulty...

    Provided By Telecom ParisTech

  • White Papers // Nov 2011

    Internet and the Erlang Formula

    The authors demonstrate that the Internet has a formula linking demand, capacity and performance that in many ways is the analogue of the Erlang loss formula of telephony. Surprisingly, this formula is none other than the Erlang delay formula. It provides an upper bound on the probability a flow of...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Adaptive Probabilistic Flooding for Multipath Routing

    In this paper, the authors develop a distributed source routing algorithm for topology discovery suitable for ISP transport networks that is however inspired by opportunistic algorithms used in ad hoc wireless networks. They propose a plug-and-play control plane, able to find multiple paths toward the same destination, and introduce a...

    Provided By Telecom ParisTech

  • White Papers // Apr 2012

    Optimal Capacity Relay Node Placement in a Multi-Hop Network on a Line

    The authors use information theoretic achievable rate formulas for the multi-relay channel to study the problem of optimal placement of relay nodes along the straight line joining a source node and a destination node. The achievable rate formulas that they utilize are for full-duplex radios at the relays and decode-and-forward...

    Provided By Telecom ParisTech

  • White Papers // Apr 2012

    Robust Methods for LTE and WiMAX Dimensioning

    This paper proposes an analytic model for dimensioning OFDMA based networks like WiMAX and LTE systems. In such a system, users require a number of sub-channels which depends on their SNR, hence of their position and the shadowing they experience. The system is overloaded when the number of required sub-channels...

    Provided By Telecom ParisTech

  • White Papers // Dec 2008

    A Semi-Analytical Method to Model Effective SINR Spatial Distribution in WiMAX Networks

    This paper has detailed the validation of mono/multi-profile BE traffic models for WiMAX network. Results through and analytical model are in good agreement. Apart from validation, the paper has also shown how robust the analytical model is w.r.t. changes in various assumptions. In robustness study, different traffic distributions, radio channel...

    Provided By Telecom ParisTech

  • White Papers // Jan 2010

    Joint Impact of Pathloss Shadowing and Fast Fading - An Outage Formula for Wireless Networks

    In this paper, the authors analyse the joint impact of pathloss, shadowing and fast fading on wireless networks. Taking into account the pathloss and the shadowing, they first express the SINR distribution of a mobile located at a given distance from its serving Base-Station (BS). The moments of this distribution...

    Provided By Telecom ParisTech

  • White Papers // Oct 2010

    A Survey of Green Networking Research

    Reduction of unnecessary energy consumption is becoming a major concern in wired networking, because of the potential economical benefits and of its expected environmental impact. These issues, usually referred to as "Green networking", relate to embedding energy-awareness in the design, in the devices and in the protocols of networks. In...

    Provided By Telecom ParisTech

  • White Papers // Oct 2010

    Rethinking Low Extra Delay Background Transport Protocols

    BitTorrent has recently introduced LEDBAT, a novel application-layer congestion control protocol for data exchange. The protocol design starts from the assumption that network bottlenecks are at the access of the network, and that thus user traffic competes creating self-inducing congestion. To relieve from this phenomenon, LEDBAT is designed to quickly...

    Provided By Telecom ParisTech

  • White Papers // Mar 2010

    Practical Improvements of Profiled Side-Channel Attacks on a Hardware Crypto-Accelerator

    This paper investigates the relevance of the theoretical framework on profiled side-channel attacks presented by F.-X. Standaert et al. at Eurocrypt 2009. The analyses consist in a case-study based on side channel measurements acquired experimentally from a hardwired cryptographic accelerator. Therefore, with respect to previous formal analyses carried out on...

    Provided By Telecom ParisTech

  • White Papers // Aug 2009

    Regret Bounds for Opportunistic Channel Access

    The authors consider the task of opportunistic channel access in a primary system composed of independent Gilbert-Elliot channels where the secondary (or opportunistic) user does not dispose of a priori information regarding the statistical characteristics of the system. It is shown that this problem may be cast into the framework...

    Provided By Telecom ParisTech

  • White Papers // Sep 2009

    Distributed Detection/localization of Change-Points in High-Dimensional Network Traffic Data

    The authors propose a novel approach for distributed statistical detection of change-points in high-volume network traffic. They consider more specifically the task of detecting and identifying the targets of Distributed Denial of Service (DDoS) attacks. The proposed algorithm, called DTopRank, performs distributed network anomaly detection by aggregating the partial information...

    Provided By Telecom ParisTech

  • White Papers // Dec 2010

    Lattice Code Design for the Rayleigh Fading Wiretap Channel

    It has been shown recently that coding for the Gaussian Wiretap Channel can be done with nested lattices. A fine lattice intended to the legitimate user must be designed as a usual lattice code for the Gaussian Channel, while a coarse lattice is added to introduce confusion at the eavesdropper,...

    Provided By Telecom ParisTech

  • White Papers // Dec 2010

    Modeling, Querying, and Mining Uncertain XML Data

    This paper deals with data mining in uncertain XML data models, this uncertainty typically coming from imprecise automatic processes. The authors first review the literature on modeling uncertain data, starting with well-studied relational models and moving then to their semi-structured counterparts. They focus on a specific probabilistic XML model, that...

    Provided By Telecom ParisTech

  • White Papers // Mar 2011

    Deriving Dynamics of Web Pages: A Survey

    The World Wide Web is dynamic by nature: content is continuously added, deleted, or changed, which makes it challenging for Web crawlers to keep up-to-date with the current version of a Web page, all the more so since not all apparent changes are significant ones. The authors review major approaches...

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    An Analytical Model for Evaluating Outage and Handover Probability of Cellular Wireless Networks

    The authors consider stochastic cellular networks where base stations locations form a homogenous Poisson point process and each mobile is attached to the base station that provides the best mean signal power. The mobile is in outage if the SINR falls below some threshold. The handover decision has to be...

    Provided By Telecom ParisTech

  • White Papers // Jun 2010

    A Fluid Model for Performance Analysis in Cellular Networks

    In this paper, the authors propose a new framework to study the performance of cellular networks using a fluid model and they derive from this model analytical formulas for interference, outage probability, and spatial outage probability. The key idea of the fluid model is to consider the discrete Base Stations...

    Provided By Telecom ParisTech

  • White Papers // Jan 2010

    An Efficient Analytical Model for the Dimensioning of WiMAX Networks Supporting Multi-Profile Best Effort Traffic

    This paper tackles the challenging task of developing a simple and accurate analytical model for performance evaluation of WiMAX networks. The need for accurate and fast-computing tools is of primary importance to face complex and exhaustive dimensioning issues for this promising access technology. In this paper, the authors present a...

    Provided By Telecom ParisTech

  • White Papers // May 2009

    Analytical Performance Evaluation of Various Frequency Reuse and Scheduling Schemes in Cellular OFDMA Networks

    In this paper, the authors present an analytical solution to carry out performance analysis of various frequency reuse schemes in an OFDMA based cellular network. They study the performance in downlink in terms of Signal to Interference (SIR) Ratio and total cell data rate. The latter is analyzed keeping in...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Dynamic System Performance of SISO, MISO and MIMO Alamouti Schemes

    MIMO systems have been deeply investigated during the last years. They have been proven to achieve better performance in terms of capacity through the multiplexing gain and in terms of reliability through to the diversity gain. Tradeoffs between these two promised gains have been established. Space-time codes were introduced as...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    Relays-Enhanced LTE-Advanced Networks Performance Studies

    This paper proposes a study on the performance of multi-hop relays networks. The authors demonstrate the importance of the relays for coverage and capacity enhancement and study how the number of relays and their position inside the cell impact the performance, and how an efficient relay location scheme can guarantee...

    Provided By Telecom ParisTech

  • White Papers // Apr 2011

    How to Set the Fractional Power Control Compensation Factor in LTE?

    The uplink power control procedure in Long Term Evolution (LTE) cellular networks is made of an open-loop part and a closed loop part. In this paper, the authors focus on the former and study the compensation factor of the related Fractional Power Control (FPC) scheme. In particular, they propose a...

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    Average SIR Estimation in Cellular Networks With Best Server Policy

    The evaluation of the Signal to Interference Ratio (SIR) in cellular networks is of primary importance for network dimensioning. For static studies, which evaluate cell capacity and coverage, as well as for dynamic studies, which consider arrivals and departures of Mobile Stations (MSs), the SIR is always an important input....

    Provided By Telecom ParisTech

  • White Papers // Sep 2010

    An Efficient Tabu Search DSA Algorithm for Heterogeneous Traffic in Cellular Networks

    In this paper, the authors propose and analyze a TS (Tabu Search) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They consider a scenario where cellular operators share a common access band, and they focus on the strategy of one operator providing packet services to the end-users. The authors...

    Provided By Telecom ParisTech

  • White Papers // Jul 2010

    A Tabu Search DSA Algorithm for Reward Maximization in Cellular Networks

    In this paper, the authors present and analyze a Tabu Search (TS) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They study a mono-operator case where the operator is providing packet services to the end-users. The objective of the cellular operator is to maximize its reward while taking into...

    Provided By Telecom ParisTech

  • White Papers // Feb 2010

    Limiting Power Transmission of Green Cellular Networks: Impact on Coverage and Capacity

    Reducing power transmission is of primary importance in future green cellular networks. First of all, the induced reduction of the interference encourages the deployment of opportunistic radios in the same spectrum. Then, it directly implies a reduction of the energy consumption. At last, electric field radiations reduction mitigates the potential...

    Provided By Telecom ParisTech

  • White Papers // Feb 2010

    Outage Probability in a Multi-Cellular Network Using Alamouti Scheme

    In this paper the authors analyze the performance of a downlink single user multi-cellular Multiple Inputs Single Output (MISO) system using the Alamouti code. The authors derive, for the first time, an analytical expression of the cumulative distribution function of the output Signal to Interference plus Noise Ratio (SINR) or...

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