Managing Interference in D2D Networks via Clustering and Topological Awareness

International audienc

Toward Optimal DoF Maximization With Interference Categorization Using TIM and SIC

International audienc

Topological Interference Management Framework for Device-to-Device Communication

International audienceThis letter considers the topological interference management (TIM) problem in a partially connected network where Device-to-Device (D2D) enabled devices are not aware of the surrounding devices' channel state information but only of the network connectivity to cancel the interference occurred. We model TIM as a low-rank-matrix-completion problem and solve it using a novel scheme based on semidefinite programming while overcoming TIM matrix special structure with hard constraints. Our simulations show a matrix rank reduction ability that outperforms other existing methods, and thus corresponds to a lessening in signal interference: a key need in D2D networks

A Framework of Topological Interference Management and Clustering for D2D Networks

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Trends in Mobile Agent Applications

In this paper we present a comprehensive study of mobile agent applications. We classify the application fields as follows: Network monitoring and management, information searching and filtering, multimedia, Internet, intrusion detection, telecommunications, military, and others. We discuss the potential uses of mobile agents in the various fields and present the many systems and architectures that have been proposed and implemented. Furthermore, we describe ongoing efforts to integrate currently implemented technologies with mobile agent technology. For each of the application fields, we list statistics showing the distribution of research output according to certain criteria such as article type and application field. We end each section with a summary of the work done and provide directions for future work. Finally, we conclude with suggestions about promising research areas involving mobile agents. ACM Classification: H.4 1

On the impact of Multi-channel Technology on Safety-Message Delivery in IEEE 802.11p/1609.4 Vehicular Networks

none4siAcceptance rate: 30%The IEEE 1609.4-Multi-Channel Operation protocol has been proposed to support the co-existence of safety and non-safety (infotainments) applications over the Dedicated Short Range Communication (DSRC) channels at the 5.9 GHz band. However, the multi- channel approach over a single-radio transceiver might result in several performance degradations that have not been thoroughly investigated yet. In this paper, we analyze the performance of safety- related applications over multi-channel vehicular networks. We demonstrate through a simulation study that the synchronous channel switching enforced by the IEEE 1609.4 protocol might easily compromise the performance of safety applications that rely on the periodic exchange of short lived broadcasts. Thus, we propose in this work the WAVE-enhanced Adaptive Broadcast (WAB) scheme. WAB provides a novel MAC contention control mechanism intended to reduce the impact of packet collisions caused by the synchronous channel switching, and to increase the packet delivery rate of broadcast messages in congested vehicular scenarios. The WAB scheme dynamically adapts to the channel conditions through a distributed load estimator metric, and implements priority mechanisms to ensure fairness among vehicles. Simulation results reveal that the proposed WAB scheme can significantly increase the packet delivery rate of broadcast messages when compared to the existing IEEE 802.11p/1609.4 scheme.noneM. Di Felice; A.J. Ghandour; H.A. Hartail; L. BononiM. Di Felice; A.J. Ghandour; H.A. Hartail; L. Bonon

A Spatiotemporal Analysis of a Group-based Access Solution for Massive MTC Networks and the Stability-Scalability Trade-off

International audienceMachine-Type Communication (MTC) Systems play a critical role in providing ubiquitous Internet of Things within the emerging 5G technologies. We consider an MTC system with a massive number of devices and provide a hybrid scheduled and group-based random access solution for accommodating the massive traffic. We study the proposed solution through a spatiotemporal analytical framework, where we use stochastic geometry, probability theory, and iterative algorithms to derive the frequency of successful transmissions and the expected queue status at the devices. The analytical model is then used to study the stability-scalability trade-off in the proposed scheme

Modeling and Simulation of WAVE 1609.4-based Multi-channel Vehicular Ad Hoc Networks

none4siRecently, the IEEE 1609.4 Standard for Wireless Access in Vehicular Environments (WAVE) has been proposed to enhance the performance of vehicular networks with multi-channel operations that allow for the coexistence of safety-related and non-safety related vehicular applications. However, while the benefits of the multi-channel approach are clear, the impact of the IEEE 1609.4 channel scheduler on the performance of delay-constrained vehicular applications remains to be well explored by researchers. At present, the evaluation of 1609.4-based Vehicular Ad Hoc Networks (VANETs) constitutes an open issue due to the lack of simulation tools that can provide a complete modeling of the IEEE WAVE 802.11p/1609.4 stack. In this paper, we provide three key contributions pertaining to multi-channel VANETs. First, we describe our implementation of the IEEE 1609.4 protocol in the ns2 simulator, and we detail its current integration with the existing ns2 implementation of the 802.11p MAC protocol. Second, using our simulation model we propose an evaluation study of 1609.4-based VANETs, and we show that the tight channel synchronization issues foreseen by the protocol might have a dramatic impact on the performance of safety-related applications with strict delivery ratio and delay requirements. Third, we propose two new enhancements for the WAVE protocol stack to favor the dissemination of safety messages in multi-channel VANETs. The suggested algorithms are shown to greatly improve packet delivery ratio and delay of safety applications in single and multi-hop topologies, while preserving the synchronization scheme of the IEEE 1609.4 protocol.BEST PAPER AWARD Runner-Up to the 5th International ICST Conference on Simulation Tools and Techniques (SimuTools 2012).noneA. J. Ghandour; M. Di Felice; H. Artail; L. BononiA. J. Ghandour; M. Di Felice; H. Artail; L. Bonon