Fethi Filali

Qatar Mobility Innovations Center | QMIC · Technology Development & Applied Research

Many vehicle-to-everything (V2X) applications and use cases require their feasibility to be simulated, tested, and validated in realistic traffic scenarios and under various network conditions before real-time testbed implementation. As cellular-V2X (C-V2X) becomes a superior technology for future connected and autonomous vehicles, the need for a s...

Predominantly, there are two wireless technologies for providing vehicle-to-everything (V2X) communications, i.e., ad hoc IEEE 802.11p and cellular LTE-V2x. This paper provides a qualitative and quantitative evaluation of both technologies. The qualitative evaluation aims to measure how these technologies meet the functional requirements of the V2X...

The existence of multiple wireless technologies and standards spurs the development of a wide range of cooperative applications for vehicular networking environments. Vehicle-to-Everything (V2X) communication systems enable several vehicular applications, and each poses a different set of performance requirements. Implementing these applications pr...

Emerging Vehicle-to-Everything (V2X) applications such as Advanced Driver Assistance Systems (ADAS) and Connected and Autonomous Driving (CAD) requires an excessive amount of data by vehicular sensors, collected, processed, and exchanged in real-time. A heterogeneous wireless network is envisioned where multiple Radio Access Technologies (RATs) can...

In vehicular networks, protocols and algorithms rely on the in-network status information and its delivery via control messages for their operations. Using the same wireless channel for data and control message transmissions consume significant channel capacity and time, thus resulting in performance degradation. In this paper, a multi-tiered, hete...

In the recent years a number of novel, automatic map-inference techniques have been proposed, which derive road-network from a cohort of GPS traces collected by a fleet of vehicles. In spite of considerable attention, these maps are imperfect in many ways: they create an abundance of spurious connections, have poor coverage, and are visually confus...

In the recent years a number of novel, automatic map-inference techniques have been proposed, which derive road-network from a cohort of GPS traces collected by a fleet of vehicles. In spite of considerable attention, these maps are imperfect in many ways: they create an abundance of spurious connections, have poor coverage, and are visually confus...

Spatiotemporal data related to traffic has become common place due to the wide availability of cheap sensors and the rapid deployment of IoT platforms. Yet, this data suffer several challenges related to sparsity, incompleteness, and noise, which makes traffic analytics difficult. In this paper, we investigate the problem of missing data or noisy i...

Wi-Fi Direct, also named Wi-Fi P2P, is a popular technology that enables device to device communication in Wireless LAN. It allows Wi-Fi Direct-enabled devices to dynamically negotiate and select one of the mobile devices as Group Owner. The Group Owner plays the role of an Access Point as in Wi-Fi infrastructure mode. Wi-Fi Direct protocol was ini...

Communication between vehicles enables a wide array of applications and services ranging from road safety to traffic management and infotainment. Each application places distinct quality of service (QoS) constraints on the exchange of information. The required performance of the supported services differs considerably in terms of bandwidth, latency...

Performance evaluation is integral to the vast majority of research on Vehicle-to-Vehicle (V2V) technology enabled connected cars. To validate ideas and concepts, researchers have been continuously striving towards the higher accuracy of simulation-based performance evaluation. However, many state-of-the-art network simulators lack comprehensive ph...

The widespread availability of GPS information in everyday devices such as cars, smartphones and smart watches make it possible to collect large amount of geospatial trajectory information. A particularly important, yet technically challenging, application of this data is to identify the underlying road network and keep it updated under various cha...

Performance evaluation is integral to the vast majority of research on Vehicle-to-Vehicle (V2V) technology enabled connected cars. To validate ideas and concepts, researchers have been continuously striving towards the higher accuracy of simulation-based performance evaluation. However, many state-of-the-art network simulators lack comprehensive ph...

Mobility in a city is represented as traffic flows in and out of defined urban travel or administrative zones. While the zones and the road networks connecting them are fixed in space, traffic flows between pairs of zones are dynamic through the day. Understanding these dynamics in real time is crucial for real time traffic planning in the city. In...

Vehicle-to-Vehicle (V2V) communication environment vary significantly in radio channel characteristics. Therefore, simulation-based studies on V2V propagation models that consider random and time-varying characteristics of surrounding environment are highly sought-after. This paper includes a detailed overview of the existing V2V channel modeling t...

Frequent traffic congestion and gridlocks are causing global economies staggering cost in terms of fuel consumption, time wastage, and public health. To rectify this problem, many advocates combining Information and Communication Technologies (ICT) and traffic engineering concepts for better traffic management. Timely and accurate traffic predictio...

We present a scalable mobile multimedia streaming system with device-to-device cooperation that enables common content distribution in dense wireless networking environments. This is particularly applicable to use cases such as delivering real-time multimedia content to fans watching a soccer game in a stadium or to participants attending a major c...

In Vehicular Ad-hoc Networks (VANETs), any vehicle uses a location service to get an up-to-date data of all vehicles' positions in its vicinity. Many location services rely on infrastructures to perform location update and location query tasks. However, the infrastructure penetration rate may differ from one region to another. We propose in this pa...

The VANET-LTE integration offers many potential advantages for vehicular networks such as high data rates, low latency and extended communication range. However, utilizing these advantages requires novel protocols and algorithms at each layer of the networking protocol stack. In this paper, we proposed a location-based routing scheme for hybrid veh...

Global warming, environmental pollution, and fuel shortage are currently major worldwide challenges. Eco-routing is one of several tools that attempt to address this challenge by minimizing network-wide vehicle fuel consumption and emission levels. Eco-routing systems select the most environmentally friendly route. The subpopulation feedback eco-ro...

Vehicle-to-Vehicle (V2V) communications offer support to several applications that can make the modern day travel safer, more efficient and enjoyable. However, reliable and efficient V2V application development requires better understanding and knowledge of the surrounding environment in which the vehicles operate them. The urban environment consis...

Cooperative Intelligent Transport Systems (C-ITS) communication technology is expected to be the near-future pioneer in the traffic management and road-safety control area by provisioning timely accurate and location-aware information. The data generated by connected vehicles may be privacy-sensitive and could be hacked by intrusive receivers. In o...

Context and situational awareness are key features and trends of the smart grid and enable adaptable, flexible and extendable smart grid services. However, the traditional hardware-dependent communication infrastructure is not designed to identify the flow and context of data, and it focuses only on packet forwarding using a pre-defined network con...

Transmission power adaptation has been widely employed to improve on the network performance. However designing an adaptation technique that could lower the number of collisions and delay under unreliable connectivity and fast topological changes due to high speed vehicles is a challenging task. In this paper we proposed an efficient broadcasting s...

Eco-routing is a technique proposed to optimize the fuel consumption in transportation networks. User feedback is used to compute the route’s fuel consumption level for other vehicles to build their minimum path routes. When a vehicle traverses a road link, it reports its fuel consumption on this link to a Traffic Management Center (TMC), which upd...

Vehicular ad hoc networks (VANETs) are a special case of mobile ad hoc networks (MANETs). The distinctive characteristics of VANETs include high-speed vehicular nodes and significant variability in node density. Collecting data from VANETs is important in monitoring, controlling, and managing road traffic. However, efficient collection of the neede...

IEEE 802.15.4m utilizing TVWS Multichannel Cluster Tree PAN (TMCTP) technology provides cost-effective and spectrum-efficient communication in a last-mile smart grid network. However, the performance of the IEEE 802.15.4m protocol can be constrained, because each device scans several hundred channels to obtain a beacon message from the Personal Are...

The increasing number of wireless communications technologies and standards bring immense opportunities and challenges to provide seamless connectivity in Hybrid Vehicular Networks (HVNs). HVNs could not only enhance existing applications but could also spur an array of new services. However, due to sheer number of use cases and applications with d...

Real-time streaming of scalable video coded (SVC) videos in vehicular networks is investigated, and novel cooperative vehicle-to-vehicle (V2V) communication methods are proposed. The proposed techniques are based on grouping the moving vehicles into cooperative clusters. Within each cluster, the long term evolution (LTE) system is used to send the...

Vehicle location information is central to many location-based services and applications in VANETs. Tracking vehicles positions and maintaining an accurate up-to-date view of the entire network are not easy due to the high mobility of vehicles and consequently rapid topology changes. The design of a scalable, accurate, and efficient location servic...

Collecting data from V2X networks is important to monitor, control and manage road traffic. However, efficient collection of the needed data is quite challenging due to vehicles mobility and the tremendous amount of events and data generated. Named Data Networking (NDN), a future internet architecture, gives more importance to content instead of it...

We aim through this work to investigate the optimal deployment of roadside units, the stationary component in the vehicular network, in order to improve the performance, the reliability and the connectivity of the network. RSUs have a critical role in safety applications but also in infotainment applications. Hence, spreading RSUs should pay attent...

Vehicular Ad-hoc Networks (VANETs) are special kind of Mobile Ad-hoc Networks (MANETs). The distinctive characteristics of the VANETs include high speed of vehicular nodes and high variability in node density. Collecting data from VANETs is important to monitor, control and manage road traffic. However, efficient collection of the needed data is qu...

Cooperative vehicle-To-vehicle (V2V) communications for real-Time video streaming of scalable video coded (SVC) videos is investigated, and a novel clustering method is proposed. In the proposed method, moving vehicles are grouped into cooperative clusters to enhance the distribution of the video to the cluster members. Within each cluster, vehicle...

The number of vehicles on roads keeps increasing continuously, making the management of traffic flow, especially in big cities more and more challenging. One of the key enablers for having smooth traffic flows and better mobility is to rely on real-time traffic monitoring systems. These systems allow road operators to implement intelligent traffic...

Named Data Networking (NDN) gives more importance to content instead of its location. On the other hand, V2X networks carry a wide variety of content such as events, traffic information and infotainment content. Therefore, NDN native capabilities in terms of caching and multicast can reduce traffic load in V2X networks and consequently decrease con...

Various wireless communication systems exist, which enable a wide range of applications and use cases in the vehicular environment. These applications can be grouped into three types, namely, road safety, traffic efficiency, and infotainment, each with its own set of functional and performance requirements. In pursuance of assisting drivers to trav...

Delay-sensitive content distribution with peer-to-peer (P2P) cooperation in public safety vehicular networks is investigated. Two cooperative schemes are presented and analyzed. The first scheme is based on unicasting from the base station, whereas the second is based on threshold based multicasting. Long Term Evolution (LTE) is used for long range...

Disaster can be defined as the onset of an extreme event causing profound damage or loss as perceived by the afflicted people. The networks built in order to detect and handle these events are called Public safety networks (PSNs). These networks have the fundamental role of providing communication and coordination for emergency operations. Many of...

Vehicular Ad-hoc Networks (VANETs) are special kind of Mobile Ad-hoc Networks (MANETs). The distinctive characteristics of the VANETs include high speed of vehicular nodes and high variability in node density. Congestion detection and control protocols have been proved to be an efficient method for improving network performance and are well studied...

This paper presents an analysis of link asymmetry in 5.9GHz vehicular communication by means of on-road experiments, and using a standard compliant vehicular communication platform. Similar works have been conducted in the last decades, especially by relevant industrial stakeholders, but none or only little information has been disclosed to the pub...

Collaborative techniques for real-time video streaming of scalable video coded (SVC) videos over vehicle to infrastructure (V2I) communications are investigated. In the studied methods, roadside units (RSUs) communicate with moving vehicles using IEEE 802.11p, whereas the long term evolution (LTE) system is used to communicate with the vehicles thr...

Car to car communication has been getting considerable interest for the last decade, especially in the last few years where market introduction phase is approaching fast. A variety of applications will be enabled thanks to car to car communication. Considerable efforts have been already spent in designing and developing efficient broadcast communic...

This paper designs a complete framework that anticipates QoS/QoE (Quality of Experience) degradation and proactively defines policies for LTE-connected cars (UEs) to select the most adequate radio access out of WiFi and LTE. For a particular application, the proposed framework considers the application type, the mobility feature (e.g., speed, user...

Given the clear impact that mobility has on economical and social development, the continuous increase in the number of vehicles coupled with the increase in mobility behavior of people are creating new problems and challenges that need to be holistically addressed to ensure safe, sustainable, efficient and environmentally friendly mobility systems...

Cooperation between mobile terminals (MTs) with the objective of energy minimization is studied. The purpose is to distribute a content of common interest to collaborating MTs while ensuring at the same time a reduced energy consumption. To reach this goal, the content is sent to selected MTs on a long range link. Then, it is forwarded to other MTs...

Contention-based forwarding (CBF) is a broadcasting technique used to disseminate emergency messages for traffic safety applications in intelligent transportation systems. Its design hypotheses have however been based on three major assumptions: uniform vehicular topology, nonfading channels and homogeneous communication capabilities. Realistic veh...

There is a general trend towards the decentralization of mobile operator networks. Such network decentralization will not be efficient without rethinking mobility management schemes, particularly for users moving for a long distance and/or at a high speed (e.g., vehicles). To support such highly mobile users, this paper introduces a data anchor gat...

This paper describes a new topology management and access control technique for wireless networks developed during Daniel's Camara PhD. The main purpose of the technique is to provide a stable and well managed topology, so that other protocols can be built on the top of it. Having a stable and predictable topology is a fundamental step to enable th...

Cooperative schemes for critical content distribution over vehicular networks are presented and analyzed. The first scheme is based on unicasting from the base station, whereas the second is based on threshold based multicasting. Long Term Evolution (LTE) is used for long range communications with the base station (BS) and 802.11p is considered for...

In this paper, we attempt to assemble the different pieces of the resource allocation puzzle of mobile WiMAX networks by addressing the main scheduling issues that are still open. We thus propose a novel multi-Constraints Scheduling Strategy (mCoSS) which maximizes the quality of service (QoS) degree of satisfaction for both real-time and non-real-...

A game theoretical formulation for energy minimization in mobile-to-mobile cooperative networks is provided. The problem is formulated as a Nash bargaining game, and the Nash bargaining solution is derived. Furthermore, a low complexity utility minimization algorithm is presented. Using the appropriate utilities, the proposed algorithm is used to i...

Car to car communication has been getting a considerable interest from both industry and academia since the last decades, and especially the last years where the market introduction phase is approaching fast. Several useful applications will be enabled by car to car communication, such as safety applications that save drivers and passengers' lives,...

During the last few years, continuous progresses in wireless communications have opened new research fields in computer networking, aimed at extending data networks connectivity to environments where wired solutions are impracticable. Among these, vehicular communication is attracting growing attention from both academia and industry, owing to the...

Disaster can be defined as the onset of an extreme event causing profound damage or loss as perceived by the afflicted people. The networks built in order to detect and handle these events are called Public safety networks (PSNs). These networks have the fundamental role of providing communication and coordination for emergency operations. Many of...

Traditional networks suppose the existence of some path between endpoints, small end to end round-trip Delay time, and loss ratio. Today, however, new applications, environments and types of devices are challenging these assumptions. In Delay Tolerant Networks (DTNs), an end-to-end path from source to destination may not exist. Nodes may connect an...

Efficient channel selection is essential in 802.11 mesh deployments, for minimizing contention and interference among co-channel devices. The IEEE 802.11 standard provides at least three non-overlapping channels and thus its possible for a node equipped with more than one network interface card (NIC) to operate on different channels simultaneously....

The IEEE Task Group has approved recently the 802.11p amendment to enable efficient short range communications for vehicular networks by introducing multiple enhancements at the physical and MAC layer. It defines a control frequency channel for control and most critical data packets and one or several service frequency channels for less critical pa...

Wireless Mesh Networks have emerged as one of the new hot topics in wireless communications. Based on Multihop infrastructure, wireless mesh networks offer increased reliability, coverage, and reduced equipment costs. Equipping wireless routers with multiple radios further improves the capacity by transmitting over multiple radios simultaneously us...

Opportunistic applications like software or digital maps updates and vehicle diagnostic reporting may require limited Intermittent Internet access. Hence, those applications can benefit of the existing Infrastructure already deployed. Moreover, the knowledge of the location of these APs, especially the ones offering free access, can help gaining ti...

Intelligent Transportation Systems (ITS) have been under development since the 80's as part of a global strategy for solving many of our modern life transportation problems. These systems enable people to reach their destinations in a safe, efficient, and comfortable way. In order to reach that goal, several radio access technologies (RAT) such as...

Nowadays, wireless 802.11 access points (APs) are increasingly widespread in urban and sub-urban areas. Besides part of them offer free access, hence such infrastructure can provide intermittent Internet access to vehicles for opportunistic applications like software or digital maps updates, vehicle diagnostic reporting, and certificates/pseudonyms...

The analysis and evaluation of new wireless network protocols is a long process that requires mathematical analysis, simulations, and increasingly experimentations under real conditions. Measurements are essential to analyze the performance of wireless protocols such as IEEE 802.11 networks in real environments, but experimentations are complex to...

Mobile WiMAX ArchitectureHorizontal Handover in 802.16eDiscussionOptimized 802.16e Handover SchemesVertical HandoverRoamingMobility Management in WiMESH NetworksConclusion SummaryReferences

This work presents an auxiliary mechanism to aid in the distribution of warning messages for Emergency Alert Systems (EAS). The main objectives of the proposed mechanism are to speed up and broaden the warning messages distribution process to provide to the public faster access to crucial information. EAS are public safety message systems designed...