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International audience; Recently, video streaming in Vehicular Ad hoc NETworks (VANETs) is considered as one of the most important challenge in vehicular communication because of the high packet loss rate and the increased transmission delay due to the highly dynamic of VANET topology. This specificity makes difficult to apply the conventional transport protocols such as UDP and TCP to video streaming over VANET. To deal with these limits and to ensure a high video quality at the end receiver, we propose in this paper a Hybrid Error Recovery Protocol (HERP) for video streaming in VANETs. The proposed protocol integrates the Sub-Packet Forward Correction (SPFEC) mechanism to recover the uniform transmission errors and the retransmission technique to recover burst errors mainly due to the network congestion and route disconnection. In order to avoid the network overload and to reduce the transmission delay, HERP adapts dynamically the redundancy rate, retransmission limit and transmission rate according to the network condition measured by the Bit Error Rate and the network load indicated by queue length of intermediate vehicles. HERP uses the reporting technique to control the network condition and the network load. To improve the video streaming quality, HERP suggests an unequal protection of video frames type (i.e. I, P, B frames). The experimental results show that HERP achieves significant improvements of transmitted video compared to native UDP protocol and UDP based on SPFEC.

International audience; One of the most important source of WSN vulnerability is the forwarding process between the nodes. In fact, routing protocols are often based on clustering principle, where a set of clusters represented by a Cluster Head (CH) for each cluster, is conceived to rely fundamentally data packets between the network nodes. These protocols are vulnerable to several attacks affecting different routing processes such as hello flooding, selective forwarding, replay process. These attacks are more damaging if the CH is corrupted by a malicious node playing CH role. This paper proposes a new secure protocol based on the well-known LEACH routing protocol named Hybrid Cryptography-Based Scheme for secure data communication in cluster-based WSN (HCBS). As a multi-constrained criteria approach, HCBS is built on a combination of the cryptography technique based on Elliptic Curves to exchange keys that uses symmetric keys for data encryption and MAC operations. After a set of tests on TOSSIM simulator, the results obtained showed that our proposal achieves good performances in terms of energy consumption, loss rate and end-to-end delay. In addition, HCBS guaranties a high level of security.

International audience; Video streaming over vehicular ad hoc network (VANET) provides accurate information about road traffic situation, digital services requested by drivers and passengers, compared to textual messages. Video dissemination in VANET is considered as a hard task because of high dynamic topology of vehicles, stringent requirements of video like real time transmission and the volatility of wireless medium channels. In this paper, we propose a new video streaming scheme called enhanced adaptive sub-packet forward error correction (EASP-FEC) aiming to improve video transmission quality in VANET. Unlike existing packet forward error correction (PFEC) mechanisms proposed for video streaming in VANET, which generate redundant packets for each block of original packets, EASP-FEC divides a packet into a set of original sub-packets, then it generates redundant sub-packets for each packet, to enhance the error recovery rate and video streaming quality. EASP-FEC also avoids the network congestion problem compared to sub-packet forward error correction (SPFEC) mechanism. We propose to apply EASP-FEC at the sender and relay vehicles, where the calculation process of redundant sub-packets take in consideration the traffic condition, the traffic load and the importance of video frame types (I, P, B). A set of simulations proved that EASP-FEC provides better error recovery rate than PFEC and avoids network congestion against SPFEC.

International audience; Rapid advances in information and communication technologies have led to the emergence of cyber-physical systems (CPSs). Wireless sensor networks (WSNs) play a pivotal role in CPSs, particularly for operations such as surveillance and monitoring. However, these WSNs are subject to various types of cyberattacks that can cause damage, theft, or destruction of sensitive data, in addition to disruption of services provided by CPSs. To strengthen cybersecurity in WSN-enabled CPSs, various researchers have proposed a new category of efficient algorithms, inspired by biological phenomena. We present a careful review of different bio-inspired techniques developed for improving cybersecurity of CPSs using WSNs. Additionally, we propose a generic bio-inspired model called Swarm Intelligence for WSN Cybersecurity (SIWC) that addresses drawbacks of prior bio-inspired approaches.

International audience; Vehicular ad hoc networks (VANETs) are witnessing in recent years a rapid development for road transmissions and are considered as one of the most important types of next generation networks, in which drivers can have access anywhere and anytime to information. However, vehicles have to deal with many challenges such as the links failures due to their frequent mobility as well as limited degrees of freedom in their mobility patterns. In this paper, we propose a new quality of service multicast and multipath routing protocol for VANETs, based on the paradigm of bee's communication, called multicast quality of service swarm bee routing for VANETs (MQBV). The MQBV finds and maintains robust routes between the source node and all multicast group members. Therefore, the average end-to-end delay and the normalized overhead load should be reduced, while at the same time increasing the average bandwidth and the packet delivery ratio. Extensive simulation results were obtained using ns-2 simulator in a realistic VANET settings and demonstrated the efficiency of the proposed protocol.

International audience; Vehicular Ad hoc NETworks (VANETs) play a key role in the design and development of Intelligent Transportation Systems (ITS) that aim to improve road safety and transportation productivity. VANETs cover vehicle-to-vehicle and vehicle-to-roadside communications. One of the most important challenges of this type of network is the timely and reliable dissemination of messages among vehicular nodes that enable drivers to take appropriate decisions to improve road safety. In the past decade, many routing protocols for VANETs that can support reliability and safety requirements have been proposed. These protocols suffer from several limitations, including complexity, lack of scalability to large scale networks, routing overheads, etc. To address these limitations, various bio-inspired approaches have been proposed to route packets among vehicular nodes in an optimized manner. We survey recent proposed bio-inspired routing algorithms for the VANET environment. In particular, we identify the key features, strengths, and weaknesses of these algorithms and compare them by using various criteria. Moreover, we propose a unified formal model of the bio-inspired multimodular approaches applied to VANET routing. We highlight main future research directions in this area.

International audience; no abstract

International audience; Intelligent transportation clouds could provideServices such as autonomy, mobility, decision support and thestandard development Environment for traffic managementstrategies, and so on. With mobile agent technology, anurban-traffic management system based on Agent-BasedDistributed and Adaptive Platforms for Transportation Systems(Adapts) is both feasible and effective. However, the large-scaleuse of mobile agents will lead to the emergence of a complex,powerful organization layer that requires enormous computingand power resources. To deal with this problem, we propose aprototype urban-traffic management system using multi agentbased intelligent traffic clouds. Cloud computing can help us tohandle the large amount of storage resources and masstransportation of data effectively and efficiently.

International audience; Research and industries are recently more interesting and attracting to the Vehicular Ad hoc Networks (VANETs) development domain. They contribute to safer and more efficient roads by providing timely and accuracy information to drivers and authorities. Thus, the definition of a quality of service routing protocol for VANETs is one of their challenges. In this paper, we propose QoSBeeVanet, a new quality of service multipath routing protocol adapted for the vehicular ad hoc networks. It is based on ideas of the autonomic bee communication. Simulation results taken with NS2 in realist urban settings were shown that QoSBeeVanet outperforms DSDV and AODV two of the current state-of-the-art protocols, in terms of end-to-end delay, packet delivery ratio, and normalized overhead load.

International audience; In the few last years, there is an increasing need of QoS guarantees for multimedia and real time applications in mobile ad hoc networks. While several QoS routing protocols were proposed, adaptive routing has not be enough exploited. This paper introduces a new multipath quality of service (QoS) routing protocol for mobile ad-hoc networks (MANETs) called QoSBeeManet. Based on the autonomic bee communication principle, the protocol guarantees, in addition to the basic routing functionality, a set of measurable QoS metrics used for multimedia and real time applications. To reduce the network congestion, QoSBeeManet uses a stochastic broadcasting of scouts as routing packets. Moreover, an evaluation of each discovered path is executed and is taken into account by the source node in the aim to transmit fairly data packets through the paths found. The simulation results reached in NS2 were compared to the conventional AODV and DSR routing protocols and have shown that QoSBeeManet has improved the average bandwidth and has reduced the average end-to-end delay. In addition, packet delivery ratio and routing protocol overhead were very close to those of AODV and DSR.