Halima Elbiaze holds a Ph.D. in computer science and a M.Sc in Telecommunication systems from Institut National des Télécommunications, Paris, France and Université de Versailles in 2002 and 1998. Since 2003, she is with the Department of Computer Science, Université du Québec Montréal, QC, Canada, where she is currently an Associate Professor. In 2005, Dr. Elbiaze received the Canada Foundation for Innovation Award to build her IP over the DWDM network Laboratory. Her research interests include performance evaluation, traffic engineering, cloud computing, wireless networks, and next generation IP networks. She had been awarded many research grants from both public agencies and industry.
International Conference on Transparent Optical Networks, 2006
In OBS networks, contention caused by multiple bursts competing simultaneously for a given wavele... more In OBS networks, contention caused by multiple bursts competing simultaneously for a given wavelength on a fiber link, significantly increases the burst dropping probability and hence deteriorates the overall network performance. Several studies tackled the contention resolution in OBS networks; however several issues still need to be addressed such as quality of service (QoS) guarantee, protection and restoration. The separation
2011 13th International Conference on Transparent Optical Networks, 2011
ABSTRACT The main weakness of OBS (Optical Burst Switching) networks is the difficulty to support... more ABSTRACT The main weakness of OBS (Optical Burst Switching) networks is the difficulty to support different types of traffic requiring several performance constraints. This paper focuses on the design and the performance evaluation of efficient cognitive OBS protocols that pave a way to the multi-service context. We present a graphical probabilistic model to avoid and resolve contention inside the OBS network. In order to efficiently exploit the available bandwidth while respecting QoS requirements, we highlight our complete framework using closed/open loop feedback control theoretic techniques to improve OBS networks performance.
2012 International Conference on Communications and Information Technology (ICCIT), 2012
ABSTRACT A key goal of designing memoryless OBS networks is the minimization of burst loss. Loss ... more ABSTRACT A key goal of designing memoryless OBS networks is the minimization of burst loss. Loss is due mainly to restraints that can occur at core nodes, such as contention. Such events occurring at OBS layer are misinterpreted by TCP congestion control mechanisms that reacts on (i) burst drops, (ii) end-to-end delay variation and (iii) throughput changes. This paper proposes a destination-ordering mechanism over a load balanced OBS network, that minimizes TCP misinterpretation and maximizes TCP throughput.
2013 IEEE International Conference on Communications (ICC), 2013
ABSTRACT Femtocell and WiFi are often presented as opposing technologies. The truth is that both ... more ABSTRACT Femtocell and WiFi are often presented as opposing technologies. The truth is that both of them play a crucial role in sustaining the continues growth in mobile traffic. In many cases both technologies will eventually be employed in a single box with access via an intelligent mobile device that will automatically select the best option. Deploying Femtocells in WiFi hotspots would let access providers add 3G capacity for users who do not have WiFi on their device and improve their quality of experience during mobility. Partitioning of the spectrum resources carries critical importance for maximizing the total capacity and quality of service (QoS) satisfaction of end users. This paper proposes a fair and QoS-based unlicensed spectrum splitting strategy between WiFi and Femtocell networks. Numerical results show that spectrum splitting under total capacity maximization constraint allows for unfair spectrum allocation, while a more equitable spectrum splitting can be accomplished by taking into account the fairness and QoS constraints.
Transparent Optical Networks, 2006 International …, 2006
... 2003. [9] VM Vokkarane, K. Haridoss, and JP Jue, Threshold-based burst assembly policies for... more ... 2003. [9] VM Vokkarane, K. Haridoss, and JP Jue, Threshold-based burst assembly policies for QoS support in optical burst-switched networks, Proc. of SPIE OptiComm, July 2002. ... of IEEE Globecom, San Francisco, CA, USA, Nov. 2003. [18] Qiong Zhang, Vinod M. Vokkarane ...
Modeling, Analysis, and Simulation On Computer and Telecommunication Systems, 2005
This paper presents a new structure-preserving method of sampling self-similar traffic with direc... more This paper presents a new structure-preserving method of sampling self-similar traffic with direct applications to network monitoring and resource provisioning. Predicting the bandwidth required by upcoming traffic plays a key role for providing an efficient and intelligent resource provisioning, especially in the context of IP over WDM. To achieve this, we are proposing a periodic sampling method (called maximum-based sampling)
This paper focuses on the design and analysis of QoS-based scheduling mechanism for service diffe... more This paper focuses on the design and analysis of QoS-based scheduling mechanism for service differentiation in Optical Flow Switching (OFS) networks. We consider two types of traffic flows: (i) delay-constraint flows (high priority flows) and (ii) Best-effort flows (low priority flows). In OFS, only optical cross connects (OXCs) are used for the switching function in the data plane and there
Cognitive radio networks are composed of spectrum-agile devices capable of changing their configu... more Cognitive radio networks are composed of spectrum-agile devices capable of changing their configurations and transmission parameters on the fly based on their spectral environment. This capability opens up the possibility of designing flexible and dynamic spectrum access strategies with the purpose of opportunistically reusing portions of the spectrum temporarily vacated by licensed primary users. However, this flexibility in the spectrum
Spectrum sharing between license holders (primary users) and unlicensed secondary users has been ... more Spectrum sharing between license holders (primary users) and unlicensed secondary users has been proposed as a solution to frequency wastage. Anyhow, the coexistence among these two types of users should not affect the quality of service of primary users. In this paper, we propose an interference control approach when one primary and multiple secondary users are simultaneously transmitting on the
International Conference on Autonomic and Autonomous Systems, 2005
This article focuses on the control plan of IP over WDM networks. Analytical and measurement stud... more This article focuses on the control plan of IP over WDM networks. Analytical and measurement studies have shown that self-similar traffic can have detrimental impact on network performance in terms of queuing delay and packet loss ratio. Nevertheless, the ubiquity of scale-invariant burstiness observed across diverse network contexts can be exploited to make more efficient resource-control decisions. This paper shows
The focus of this paper is the shaping of self-similar traffic at the access of an optical node. ... more The focus of this paper is the shaping of self-similar traffic at the access of an optical node. We propose a novel algorithm that dynamically shapes the incoming traffic, based on service curves equations, in order to meet the optical nodes constraints in terms of buffer size or delay. We first estimate arrival parameters within various time intervals in order
Traffic prediction constitutes a new hot research topic of network metrology. Thus, tuning the pr... more Traffic prediction constitutes a new hot research topic of network metrology. Thus, tuning the prediction model parameters is very crucial to achieve accurate prediction. This work focuses on the design, the empirical evaluation and the analysis of the behavior of training-based models for predicting the throughput of a single link i.e. the incoming input data in Megabit per time interval
International Conference on Transparent Optical Networks, 2006
In OBS networks, contention caused by multiple bursts competing simultaneously for a given wavele... more In OBS networks, contention caused by multiple bursts competing simultaneously for a given wavelength on a fiber link, significantly increases the burst dropping probability and hence deteriorates the overall network performance. Several studies tackled the contention resolution in OBS networks; however several issues still need to be addressed such as quality of service (QoS) guarantee, protection and restoration. The separation
2011 13th International Conference on Transparent Optical Networks, 2011
ABSTRACT The main weakness of OBS (Optical Burst Switching) networks is the difficulty to support... more ABSTRACT The main weakness of OBS (Optical Burst Switching) networks is the difficulty to support different types of traffic requiring several performance constraints. This paper focuses on the design and the performance evaluation of efficient cognitive OBS protocols that pave a way to the multi-service context. We present a graphical probabilistic model to avoid and resolve contention inside the OBS network. In order to efficiently exploit the available bandwidth while respecting QoS requirements, we highlight our complete framework using closed/open loop feedback control theoretic techniques to improve OBS networks performance.
2012 International Conference on Communications and Information Technology (ICCIT), 2012
ABSTRACT A key goal of designing memoryless OBS networks is the minimization of burst loss. Loss ... more ABSTRACT A key goal of designing memoryless OBS networks is the minimization of burst loss. Loss is due mainly to restraints that can occur at core nodes, such as contention. Such events occurring at OBS layer are misinterpreted by TCP congestion control mechanisms that reacts on (i) burst drops, (ii) end-to-end delay variation and (iii) throughput changes. This paper proposes a destination-ordering mechanism over a load balanced OBS network, that minimizes TCP misinterpretation and maximizes TCP throughput.
2013 IEEE International Conference on Communications (ICC), 2013
ABSTRACT Femtocell and WiFi are often presented as opposing technologies. The truth is that both ... more ABSTRACT Femtocell and WiFi are often presented as opposing technologies. The truth is that both of them play a crucial role in sustaining the continues growth in mobile traffic. In many cases both technologies will eventually be employed in a single box with access via an intelligent mobile device that will automatically select the best option. Deploying Femtocells in WiFi hotspots would let access providers add 3G capacity for users who do not have WiFi on their device and improve their quality of experience during mobility. Partitioning of the spectrum resources carries critical importance for maximizing the total capacity and quality of service (QoS) satisfaction of end users. This paper proposes a fair and QoS-based unlicensed spectrum splitting strategy between WiFi and Femtocell networks. Numerical results show that spectrum splitting under total capacity maximization constraint allows for unfair spectrum allocation, while a more equitable spectrum splitting can be accomplished by taking into account the fairness and QoS constraints.
Transparent Optical Networks, 2006 International …, 2006
... 2003. [9] VM Vokkarane, K. Haridoss, and JP Jue, Threshold-based burst assembly policies for... more ... 2003. [9] VM Vokkarane, K. Haridoss, and JP Jue, Threshold-based burst assembly policies for QoS support in optical burst-switched networks, Proc. of SPIE OptiComm, July 2002. ... of IEEE Globecom, San Francisco, CA, USA, Nov. 2003. [18] Qiong Zhang, Vinod M. Vokkarane ...
Modeling, Analysis, and Simulation On Computer and Telecommunication Systems, 2005
This paper presents a new structure-preserving method of sampling self-similar traffic with direc... more This paper presents a new structure-preserving method of sampling self-similar traffic with direct applications to network monitoring and resource provisioning. Predicting the bandwidth required by upcoming traffic plays a key role for providing an efficient and intelligent resource provisioning, especially in the context of IP over WDM. To achieve this, we are proposing a periodic sampling method (called maximum-based sampling)
This paper focuses on the design and analysis of QoS-based scheduling mechanism for service diffe... more This paper focuses on the design and analysis of QoS-based scheduling mechanism for service differentiation in Optical Flow Switching (OFS) networks. We consider two types of traffic flows: (i) delay-constraint flows (high priority flows) and (ii) Best-effort flows (low priority flows). In OFS, only optical cross connects (OXCs) are used for the switching function in the data plane and there
Cognitive radio networks are composed of spectrum-agile devices capable of changing their configu... more Cognitive radio networks are composed of spectrum-agile devices capable of changing their configurations and transmission parameters on the fly based on their spectral environment. This capability opens up the possibility of designing flexible and dynamic spectrum access strategies with the purpose of opportunistically reusing portions of the spectrum temporarily vacated by licensed primary users. However, this flexibility in the spectrum
Spectrum sharing between license holders (primary users) and unlicensed secondary users has been ... more Spectrum sharing between license holders (primary users) and unlicensed secondary users has been proposed as a solution to frequency wastage. Anyhow, the coexistence among these two types of users should not affect the quality of service of primary users. In this paper, we propose an interference control approach when one primary and multiple secondary users are simultaneously transmitting on the
International Conference on Autonomic and Autonomous Systems, 2005
This article focuses on the control plan of IP over WDM networks. Analytical and measurement stud... more This article focuses on the control plan of IP over WDM networks. Analytical and measurement studies have shown that self-similar traffic can have detrimental impact on network performance in terms of queuing delay and packet loss ratio. Nevertheless, the ubiquity of scale-invariant burstiness observed across diverse network contexts can be exploited to make more efficient resource-control decisions. This paper shows
The focus of this paper is the shaping of self-similar traffic at the access of an optical node. ... more The focus of this paper is the shaping of self-similar traffic at the access of an optical node. We propose a novel algorithm that dynamically shapes the incoming traffic, based on service curves equations, in order to meet the optical nodes constraints in terms of buffer size or delay. We first estimate arrival parameters within various time intervals in order
Traffic prediction constitutes a new hot research topic of network metrology. Thus, tuning the pr... more Traffic prediction constitutes a new hot research topic of network metrology. Thus, tuning the prediction model parameters is very crucial to achieve accurate prediction. This work focuses on the design, the empirical evaluation and the analysis of the behavior of training-based models for predicting the throughput of a single link i.e. the incoming input data in Megabit per time interval
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Papers by Halima Elbiaze