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86 results on '"Naït-Abdesselam, Farid"'

1. Addressing Trust Challenges in Blockchain Oracles Using Asymmetric Byzantine Quorums

Author

Rahman, Fahad, Titouna, Chafiq, and Nait-Abdesselam, Farid

Subjects
Computer Science - Cryptography and Security
Abstract

Distributed Computing in Blockchain Technology (BCT) hinges on a trust assumption among independent nodes. Without a third-party interface or what is known as a Blockchain Oracle, it can not interact with the external world. This Oracle plays a crucial role by feeding extrinsic data into the Blockchain, ensuring that Smart Contracts operate accurately in real time. The Oracle problem arises from the inherent difficulty in verifying the truthfulness of the data sourced by these Oracles. The genuineness of a Blockchain Oracle is paramount, as it directly influences the Blockchain's reliability, credibility, and scalability. To tackle these challenges, a strategy rooted in Byzantine fault tolerance {\phi} is introduced. Furthermore, an autonomous system for sustainability and audibility, built on heuristic detection, is put forth. The effectiveness and precision of the proposed strategy outperformed existing methods using two real-world datasets, aimed to meet the authenticity standards for Blockchain Oracles., Comment: 12 pages, 16 figures

Published
2023

4. X-haul Outage Compensation in 5G/6G Using Reconfigurable Intelligent Surfaces

Author

Selim, Mohamed Y., Kamal, Ahmed E., and Nait-Abdesselam, Farid

Subjects
Computer Science - Information Theory, Computer Science - Emerging Technologies
Abstract

5G network operators consider the dense deployment of small base-stations (SBSs) to increase network coverage and capacity. Hence, operators face the challenge of X-hauling, i.e., backhauling or fronthauling, their traffic to the core network. Also, SBSs densification will increase the possibility of failure of these X-haul links. To cope with this problem, an X-haul outage compensation scheme with the assistance of Reconfigurable Intelligent Surfaces (RIS) is proposed to mitigate or at least alleviate the effect of X-haul failure. The RIS is a newly adopted technology that is able to improve the performance of wireless networks. In this paper, we present and evaluate an X-haul outage compensation scheme based on placing a number of RIS panels in pre-planned locations to mitigate the effect of X-haul failure. This evaluation is done using frequencies below and beyond 6 GHz. Based on our analytical results, the proposed RIS scheme shows that placing a sufficient number of RIS elements in proximity to the failed SBS under certain conditions can help acquire the same X-haul rate before the occurrence of the failure. Also, we show that for high X-haul spectral density, the RIS-assisted transmission with a certain number of elements can be more energy-efficient than line-of-sight and non-line-of-sight transmissions. Finally, the system's energy efficiency is addressed with and without RIS, and the optimal number of RIS reflecting elements is derived., Comment: This paper was submitted to a conference May 2022

Published
2022

5. D3S: A Framework for Enabling Unmanned Aerial Vehicles as a Service

Author

Naït-Abdesselam, Farid, Alsharoa, Ahmad, Selim, Mohamed, Qiao, Daji, and Kamal, Ahmed E.

Subjects
Computer Science - Networking and Internet Architecture
Abstract

In this paper, we consider the use of UAVs to provide wireless connectivity services, for example after failures of wireless network components or to simply provide additional bandwidth on demand, and introduce the concept of UAVs as a service (UaaS). To facilitate UaaS, we introduce a novel framework, dubbed D3S, which consists of four phases: demand, decision, deployment, and service. The main objective of this framework is to develop efficient and realistic solutions to implement these four phases. The technical problems include determining the type and number of UAVs to be deployed, and also their final locations (e.g., hovering or on-ground), which is important for serving certain applications. These questions will be part of the decision phase. They also include trajectory planning of UAVs when they have to travel between charging stations and deployment locations and may have to do this several times. These questions will be part of the deployment phase. The service phase includes the implementation of the backbone communication and data routing between UAVs and between UAVs and ground control stations.

Published
2019

6. Detection and Prediction of Cardiac Anomalies Using Wireless Body Sensors and Bayesian Belief Networks

Author

Darwaish, Asim, Naït-Abdesselam, Farid, and Khokhar, Ashfaq

Subjects
Computer Science - Machine Learning, Statistics - Machine Learning
Abstract

Intricating cardiac complexities are the primary factor associated with healthcare costs and the highest cause of death rate in the world. However, preventive measures like the early detection of cardiac anomalies can prevent severe cardiovascular arrests of varying complexities and can impose a substantial impact on healthcare cost. Encountering such scenarios usually the electrocardiogram (ECG or EKG) is the first diagnostic choice of a medical practitioner or clinical staff to measure the electrical and muscular fitness of an individual heart. This paper presents a system which is capable of reading the recorded ECG and predict the cardiac anomalies without the intervention of a human expert. The paper purpose an algorithm which read and perform analysis on electrocardiogram datasets. The proposed architecture uses the Discrete Wavelet Transform (DWT) at first place to perform preprocessing of ECG data followed by undecimated Wavelet transform (UWT) to extract nine relevant features which are of high interest to a cardiologist. The probabilistic mode named Bayesian Network Classifier is trained using the extracted nine parameters on UCL arrhythmia dataset. The proposed system classifies a recorded heartbeat into four classes using Bayesian Network classifier and Tukey's box analysis. The four classes for the prediction of a heartbeat are (a) Normal Beat, (b) Premature Ventricular Contraction (PVC) (c) Premature Atrial Contraction (PAC) and (d) Myocardial Infarction. The results of experimental setup depict that the proposed system has achieved an average accuracy of 96.6 for PAC\% 92.8\% for MI and 87\% for PVC, with an average error rate of 3.3\% for PAC, 6\% for MI and 12.5\% for PVC on real electrocardiogram datasets including Physionet and European ST-T Database (EDB).

Published
2019

8. Malware Forensics: Legacy Solutions, Recent Advances, and Future Challenges

Author

Naït-Abdesselam, Farid, Darwaish, Asim, Titouna, Chafiq, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Nicopolitidis, Petros, editor, Misra, Sudip, editor, Yang, Laurence T., editor, Zeigler, Bernard, editor, and Ning, Zhaolng, editor

Published
2022
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19. DPS-MAC: An Asynchronous MAC Protocol for Wireless Sensor Networks

Author

Wang, Heping, Zhang, Xiaobo, Naït-Abdesselam, Farid, Khokhar, Ashfaq, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Aluru, Srinivas, editor, Parashar, Manish, editor, Badrinath, Ramamurthy, editor, and Prasanna, Viktor K., editor

Published
2007
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21. QoS control and adaptation in distributed multimedia systems

Author

Naït-Abdesselam, Farid, Agoulmine, Nazim, Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Rolim, José, editor, Mueller, Frank, editor, Zomaya, Albert Y., editor, Ercal, Fikret, editor, Olariu, Stephan, editor, Ravindran, Binoy, editor, Gustafsson, Jan, editor, Takada, Hiroaki, editor, Olsson, Ron, editor, Kale, Laxmikant V., editor, Beckman, Pete, editor, Haines, Matthew, editor, ElGindy, Hossam, editor, Caromel, Denis, editor, Chaumette, Serge, editor, Fox, Geoffrey, editor, Pan, Yi, editor, Li, Keqin, editor, Yang, Tao, editor, Chiola, G., editor, Conte, G., editor, Mancini, L. V., editor, Méry, Domenique, editor, Sanders, Beverly, editor, Bhatt, Devesh, editor, and Prasanna, Viktor, editor

Published
1999
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24. D3S: A Framework for Enabling Unmanned Aerial Vehicles as a Service

Author

Naït-Abdesselam, Farid, Alsharoa, Ahmad, Selim, Mohamed, Qiao, Daji, and Kamal, Ahmed E.

Subjects
Computer Science - Networking and Internet Architecture, Networking and Internet Architecture (cs.NI), FOS: Computer and information sciences
Abstract

In this paper, we consider the use of UAVs to provide wireless connectivity services, for example after failures of wireless network components or to simply provide additional bandwidth on demand, and introduce the concept of UAVs as a service (UaaS). To facilitate UaaS, we introduce a novel framework, dubbed D3S, which consists of four phases: demand, decision, deployment, and service. The main objective of this framework is to develop efficient and realistic solutions to implement these four phases. The technical problems include determining the type and number of UAVs to be deployed, and also their final locations (e.g., hovering or on-ground), which is important for serving certain applications. These questions will be part of the decision phase. They also include trajectory planning of UAVs when they have to travel between charging stations and deployment locations and may have to do this several times. These questions will be part of the deployment phase. The service phase includes the implementation of the backbone communication and data routing between UAVs and between UAVs and ground control stations.

Published
2020
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31. F2-TCP: A fairer and TCP-friendlier congestion control protocol for high-speed networks

Author

Chen, Shan, Zhu, Junhua, Bensaou, Brahim, Naït-Abdesselam, Farid, Chen, Shan, Zhu, Junhua, Bensaou, Brahim, and Naït-Abdesselam, Farid

Abstract

Several studies have shown that in high-speed networks it is likely that a large number of packets are dropped in a single loss event on a bottleneck link and a large portion of the ongoing flows are about to experience packet losses. Such synchronized losses among flows have negative effects on the performance of most loss-based congestion control protocols proposed for high-speed networks, especially with respect to fairness considerations. We propose in this paper F2-TCP, a new loss-based congestion control protocol for high-speed networks, to achieve better fairness and TCP-friendliness. Simulation studies show that F2-TCP indeed fulfills these design goals. The superior performance and the low deployment cost, especially on legacy machines, make F2-TCP a good alternative for today's high-speed networks. © 2008 IEEE.

Published
2008

32. Performance analysis of an energy efficient MAC protocol for sensor networks

Author

Zhang, Jun, Naït-Abdesselam, Farid, Bensaou, Brahim, Zhang, Jun, Naït-Abdesselam, Farid, and Bensaou, Brahim

Abstract

In this paper we derive a qualitative model for O-MAC, an energy efficient MAC protocol designed for sensor networks. Through this model we study how each parameter, such as packet sending rate, node density and end-to-end hop lengths, affects the performance of O-MAC and the limitation of current O-MAC protocol. Moreover, the model gives us the direction of with which to modify the current O-MAC protocol to improve its performance. © 2008 IEEE.

Published
2008

33. O-MAC: An organized energy-aware MAC protocol for wireless sensor networks

Author

Naït-Abdesselam, Farid, Bensaou, Brahim, Soëte, Thomas, Hung, Ka-Lok, Naït-Abdesselam, Farid, Bensaou, Brahim, Soëte, Thomas, and Hung, Ka-Lok

Abstract

The efficient use of energy in wireless sensor networks is critical issue as the battery of a sensor node, in most cases, cannot be recharged or replaced after deployment. In order to detect an event, a sensor node spends most of the time in monitoring its environment, during which a significant amount of energy can be saved by placing the radio in the low power sleep mode when no reception and/or transmission of data is involved. In this paper, we discuss the design of a new MAC protocol for wireless sensor networks whose goal is to extend the lifetime of the network by avoiding major energy waste causes, such as collisions, overhearing and idle listening, without compromising other network performance measures such as network throughput. The performance of the protocol is studied by simulation and is compared to that of the well known S-MAC protocol which is designed to save energy and to the IEEE 802.11 protocol which is designed to maximize throughput. © 2007 IEEE.

Published
2007

34. Detecting and avoiding wormhole attacks in optimized link state routing protocol

Author

Naït-Abdesselam, Farid, Bensaou, Brahim, Jinkyu, Yoo, Naït-Abdesselam, Farid, Bensaou, Brahim, and Jinkyu, Yoo

Abstract

A particularly severe attack on routing protocols in ad hoc networks is the so-called wormhole attack in which two or more colluding attacking nodes record packets at one location, and tunnel them to another location for a replay at that remote location. When this attack targets specifically routing control packets, the nodes that are close to the attackers are in effect shielded from finding any alternative routes to the remote location with more than one or two hops, and thus all the routes will be directed to the wormhole established by the attackers. In optimized link state routing protocol (OLSR), if a wormhole attack is launched during the propagation of link state packets, the wrong link information will propagate throughout the network, leading to routing disruption. In this paper, we devise an efficient method to detect and avoid wormhole attacks in the OLSR protocol. This method tries first to infer links that may potentially lead to wormhole tunnels. The proper wormhole detection will then be applied to suspicious links by means of an exchange of encrypted probing packets between the two supposed neighbors (endpoints of the wormhole). Our solution has several advantages since it does not require any time synchronization or location information and shows high detection rate under various scenarios. © 2007 IEEE.

Published
2007

35. Performance modelling of the O-MAC protocol

Author

Zhang, Jun, Naït-Abdesselam, Farid, Bensaou, Brahim, Zhang, Jun, Naït-Abdesselam, Farid, and Bensaou, Brahim

Abstract

In this paper we derive a qualitative model for O-MAC, an energy efficient MAC protocol designed for sensor networks. Through this model we study how each parameter, such as packet sending rate, node density and end-to-end hop lengths, affects the performance of O-MAC and the limitation of current O-MAC protocol. More-over, the model gives us the direction of with which to modify the current O-MAC protocol to improve its performance. Copyright 2007 ACM.

Published
2007

36. R-MAC: Reservation medium access control protocol for wireless sensor networks

Author

Yessad, Samira, Naït-Abdesselam, Farid, Taleb, Tarik, Bensaou, Brahim, Yessad, Samira, Naït-Abdesselam, Farid, Taleb, Tarik, and Bensaou, Brahim

Abstract

Energy consumption is a critical issue in wireless sensor networks as the battery of a sensor node, in most cases, cannot be recharged or replaced after deployment. In order to detect an event, a sensor node spends most of the time in monitoring its environment, during which a significant amount of energy can be saved by placing the radio in the low power sleep mode when no reception and/or transmission of data is involved. In this paper, we discuss the design of a new MAC protocol for wireless sensor networks, which mainly avoids overhearing, collisions, and frequent commutation between sleep and active modes. These issues are generally considered to be the most important reasons behind energy waste in heavy loaded conditions of wireless sensor networks. The proposed protocol, called Reservation-MAC (R-MAC), uses two separate periods during the communication process. In the first period, nodes compete for time slots reservation for their future transmissions, and in the second period, each node transmits its data or receive data from a corresponding sender. Once a node is aware of its transmission and/or reception time slot, it stays active only for these time slots and goes back to the sleep mode during the remaining time of the transmission period. In our experiments, the performance of the R-MAC protocol is studied in saturated conditions and compared with the well known S-MAC and T-MAC protocols. Depending on the traffic load, the proposed MAC protocol significantly improves the energy consumption compared to S-MAC and T-MAC. © 2007 IEEE.

Published
2007

37. Logical wormhole prevention in optimized link state routing protocol

Author

Attir, Azeddine, Naït-Abdesselam, Farid, Bensaou, Brahim, Ben-Othman, Jalel, Attir, Azeddine, Naït-Abdesselam, Farid, Bensaou, Brahim, and Ben-Othman, Jalel

Abstract

A particularly severe attack on routing protocols in ad hoc networks is the so-called wormhole attack in which two or more colluding attacking nodes record packets at one location, and tunnel them to another location for a replay at that remote location. When this attack targets specifically routing control packets, the nodes that are close to the attackers are in effect shielded from finding any alternative routes to the remote location with more than one or two hops, and thus all the routes will be directed to the wormhole established by the attackers. In optimized link state routing protocol (OLSR), if a wormhole attack is launched during the propagation of link state packets, the wrong link information will propagate throughout the network, leading to routing disruption. In this paper, we devise an efficient method to detect wormhole attacks in the OLSR protocol. This method tries to ascertain the effective presence of neighbors by employing an efficient neighborhood detection algorithm. Our method has several advantages since it does not require any time synchronization or location information and shows high detection rate under various scenarios. © 2007 IEEE.

Published
2007

38. Hybrid alternative receiver-sender approach with a coloured DR/BDR mechanism for the broadcast of safety messages in VANETs

Author

Benaidja, Amira, Moussaoui, Samira, and Naït-Abdesselam, Farid

Abstract

Multi-hop broadcasting represents the key technique to disseminate warning messages in vehicular networks. Its core problem is how to minimise the number of redundantly received messages while maintaining good latency and reachability that are hard to achieve simultaneously owing to the vehicles mobility and the lossy wireless channel. The proposed Sender-Oriented approaches delay the rebroadcast and cannot ensure reliability. Receiver-oriented ones, which are most suitable for safety applications, have to benefit in an efficient way from the exchanged IEEE802.11P safety beacons. In this paper, we propose an alternative Receiver-Sender approach that combines advantages of the two existing approaches to ensure low latency and high reliability. To overcome the unreliability and broadcast overhead generated by periodic rebroadcasts and multiple relay schemes, we introduce a designated relay (DR)/backup designated relay (BDR) mechanism where the BDR has to replace the DR when detecting its failure in informing concerned vehicles based on exchanged coloured beacons. Simulations show that combining the two approaches with the DR/BDR mechanism has a better performance than using each approach separately.

Published
2017
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46. Towards cross-layer approaches to coping with misbehavior in mobile ad hoc networks: an anatomy of reputation systems.

Author

Wang, Shuzhen, Zhang, Zonghua, and Naït-Abdesselam, Farid

Subjects
CROSS layer optimization, AD hoc computer networks, WIRELESS communications, INTRUSION detection systems (Computer security), COMPUTER access control
Abstract

In mobile ad hoc networks (MANETs), the nodes need to cooperate each other to establish multi-hop routes for out-of-range wireless communication. However, some of them may not always behave normally, either behaving selfishly for saving computational resource or maliciously for compromising communication protocols. Regardless of intents, such misbehavior would lead to the degradation of network performance. It is therefore important to design appropriate mechanisms to ensure that network performance could be maintained at an acceptable level in the presence of misbehaving nodes. But the open nature of MANETs makes such designs challenging. Reputation system has been widely recognized as an effective approach, which associates the behavior of nodes with its reputation, which is calculated by specifying and quantifying the observations of interest with respect to predefined performance metrics. More interestingly, the observations can be obtained and integrated from multiple layers, facilitating cross-layer analysis. This paper intends to take a deep look into several well-studied reputation systems and examine their operational characteristics in terms of modeling approaches and redemption techniques, with an objective to identify their capabilities in terms of misbehavior detection coverage and blind spots. Furthermore, such an anatomy allows us to better understand the failure curses of the deployment and operation of reputation systems in MANETs, so as to improve their performance by adopting effective countermeasures.Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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47. An asynchronous low-power medium access control protocol for wireless sensor networks.

Author

Wang, Heping, Zhang, Xiaobo, Naït-Abdesselam, Farid, and Khokhar, Ashfaq

Subjects
WIRELESS sensor networks, WIRELESS sensor nodes, ENERGY consumption, NETWORK performance, SYSTEMS engineering
Abstract

Duty cycling is a fundamental approach used in contention-based medium access control (MAC) protocols for wireless sensor networks (WSNs) to reduce power consumption in sensor nodes. Existing duty cycle-based MAC protocols use either scheduling or low-power listening (LPL) to reduce unnecessary energy lost caused by idle listening and overhearing. This paper presents a new asynchronous duty-cycled MAC protocol for WSN. It introduces a novel dual preamble sampling (DPS) approach to efficiently coordinate channel access among nodes. DPS combines LPL with a short-strobed preamble approach to significantly reduce the idle-listening issue in existing asynchronous protocols. We provide detailed analysis of the energy consumption by using well-known energy models and compare our work with B-MAC and X-MAC, two most popular asynchronous duty cycle-based MAC protocols for WSNs. We also present experimental results based on NS-2 simulations. We show that depending on the traffic load and preamble length, the proposed MAC protocol improves energy consumption significantly without degrading network performances in terms of delivery ratio and latency. For example, for a traffic rate of 0.1 packets/s and a preamble length of 0.1 s, the average improvement in energy consumption is about 154%. Copyright © 2011 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2013
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48. Cross-Layer Optimized MAC to Support Multihop QoS Routing for Wireless Sensor Networks.

Author

Heping Wang, Xiaobo Zhang, Naït-Abdesselam, Farid, and Khokhar, Ashfaq

Subjects
EMBEDDED computer systems, ROUTING (Computer network management), TIME division multiple access, PACKET switching, QUEUEING networks, AUTOMATIC control systems
Abstract

This paper presents an efficient hybrid medium-access control (HMAC) protocol with an embedded cross-layer optimization solution to provide routing-layer coarse-grained end-to-end quality-of-service (QoS) support for latency-sensitive traffic flows. A novel channel-reservation technique is proposed to significantly reduce the end-to-end delay for delay-sensitive traffic flows by allowing packets to go through multiple hops within a single medium-access control (MAC) frame and by also giving them higher priority channel access to reduce possible queuing delay. Our proposed protocol (HMAC) combines energy-efficient features of the existing contention-based and time-division multiple-access (TDMA)-based MAC protocols and adopts a short frame structure to expedite packet delivery. Simulation results in ns-2 show that HMAC achieves significant performance improvements in energy consumption, latency, and throughput over existing MAC protocols. [ABSTRACT FROM AUTHOR]

Published
2010
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49. Distortion Analysis for Real-Time Data Collection of Spatially Temporally Correlated Data Fields in Wireless Sensor Networks.

Author

Xiaobo Zhang, Heping Wang, Naït-Abdesselam, Farid, and Khokhar, Ashfaq A.

Subjects
ALGORITHMS, WIRELESS communications, DATA transmission systems, COMPUTER networks, DIGITAL communications, BROADBAND communication systems, ELECTRONIC data processing
Abstract

This paper presents an analysis framework for estimating spatio-temporal distortion associated with data-gathering algorithms in sensor networks. We assume that the underlying data field being sensed is spatially and temporally correlated and that the sink node performs real-time reconstruction of the field. Unlike existing work, the proposed analysis framework assumes realistic transmission schemes and network/routing parameters, such as congestion and limited transmission range. Our simulations show that, even for a simple collision-free transmission scheme and regular deployment patterns, the distortion analyses yield starkly different results, compared with the analyses performed in the absence of these assumptions. The analytical method presented in this paper could easily be extended to consider the real-time data-reconstruction problem under different transmission schemes, node distributions, and reconstruction methods. [ABSTRACT FROM AUTHOR]

Published
2009
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