To improve safety on the roads, next-generation vehicles will be equipped with short-range communication technologies. Many applications enabled by such based a continuous broadcast of information about own status from each vehicle to neighborhood, often referred as cooperative awareness or beaconing. Although only standardized technology allowing direct vehicle-to-vehicle (V2V) has been IEEE 802.11p until now, latest release longterm evolution (LTE) included advanced device-to-device...

In the latest years, 3GPP has added short range cellular-vehicle-to-anything (C-V2X) to features of LTE and 5G in order make vehicles, roadside devices, vulnerable users directly exchange information using same chipset as for classical long connections. C-V2X is based on use advanced physical layer techniques orthogonal resources, one main aspects affecting its performance way resources are allocated. Allocations can be either managed by network or a distributed way, nodes. The latter case,...

The revolution of cooperative connected and automated vehicles is about to begin a key milestone the introduction short range wireless communications between cars. Given tremendous expected market growth, two different technologies have been standardized by international companies consortia, namely IEEE 802.11p, out for nearly decade, cellular-vehicle-to-anything (C-V2X), recent definition. In both cases, evolutions are under discussion. former only decentralized based on sensing before...

With the increasing needs of automotive industry, 3GPP is developing new functionalities in long term evolution (LTE) cellular technology to specifically address vehicle-to-everything (V2X) connectivity, including particular vehicle-to-vehicle (V2V) direct communications. At basis most enabled applications, either dealing with safety, traffic management or infotainment, it importance cooperative awareness service, corresponding messages sent periodically broadcast by all vehicles inform...

Cooperative awareness, consisting in the periodic broadcasting of messages, called beacons, to inform neighboring vehicles about maneuvers, changes direction and other relevant mobility information, represents core requirement enable applications that may increase road safety transportation efficiency. Up few months ago, when latest 3GPP Release added long term evolution (LTE) support vehicle-to-vehicle (V2V) communications, only suitable standard was IEEE 802.11p U.S. corresponding ITS-G5...

Vehicles will soon be connected and interacting directly with each other the road infrastructure, bringing substantial benefits in terms of safety traffic efficiency. The past decade has seen development different wireless access technologies for vehicle-to-everything (V2X) communications an extensive set related use cases have been drafted, its own requirements. In this paper, focusing on short-range communications, we analyze technical economic motivations that are driving new users’...

The Third Generation Partnership Project (3GPP) has recently published a new set of specifications to enable advanced driving applications in fifth generation (5G) vehicle-to-everything (V2X) scenarios, with particular effort dedicated the sidelink resource allocation autonomous mode, named Mode 2. In this paper, we conduct comprehensive analysis 2 performance via an open-source system-level simulator, which implements 5G New Radio (NR) flexible numerology and physical layer aspects together...

Platooning is an application where a group of vehicles move one after each other in close proximity, acting jointly as single physical system. The scope platooning to improve safety, reduce fuel consumption, and increase road use efficiency. Even if conceived several decades ago concept, based on the new progress automation vehicular networking has attracted particular attention latest years expected become common implementation next future, at least for trucks. platoon system result...

Cellular-vehicle-to-everything (C-V2X) is gaining an increasing interest among the technologies under consideration for future connected and automated vehicles, especially sidelink LTE-V2X Mode 4 5G-V2X 2, where nodes autonomously perform resource allocations transmissions, without relying on any infrastructure.In these cases, allocation process has been designed based assumption of periodic packet generation constrained to a few possible periods.Nevertheless, even assuming that awareness...

Joint communication and sensing allows to share frequency spectrum, hardware, signal processing blocks between sensing, providing new radar functionalities through the exploitation of signals. This is becoming an important trend also in vehicular communications, where future standardized technologies for connected vehicles can be used detect targets nearby without overloading already scarce spectrum with dedicated Objective this paper characterize performance 5 G radio (NR)...

Vehicles will soon be equipped with wireless communication systems enabling a variety of new services. At the basis each service is transmission beacon messages that advertise vehicle's presence. In this letter, we investigate long term evolution (LTE) as technology for vehicle to (V2V) beaconing by exploiting: 1) direct device (D2D) provided Release 12 LTE; and 2) full duplex (FD) radio, which allows transmit receive at same time. Furthermore, introduce novel analytical framework evaluate...

The Cellular Vehicle-to-Everything (C-V2X) radio access technology has been specified by the Third Generation Partnership Project (3GPP) in Releases 14 and 15, with special focus on enabling direct communication between vehicles, over sidelink PC5 interface. More recently, 3GPP launched New Radio (NR) standardization activity for first phase of fifth generation (5G) systems is ready to enhance C-V2X several ways under 5G NR Release 16. V2X will encompass flexible numerologies agile frame...

The third generation partnership project (3GPP) has issued specifications for the autonomous assignment of radio resources by vehicles on sidelink cellular-vehicle-to-everything (C-V2X) technology. It is based a sensing mechanism resource selection and semi-persistent scheduling reservation to periodic safety messages. Imperfect due hidden terminals half-duplex board transceivers may result in interfered successive message transmissions. As consequence lost packets, involved become blind...

The cellular vehicle-to-everything (C-V2X) sidelink technology, specified in the long-term evolution (LTE) and further improved 5G new radio (NR) standards to facilitate direct data exchange between vehicles, will play a crucial role revolutionizing transportation systems. However, demand for very high reliability ultralow latency services especially challenges resource allocation mechanism when performed by distributed so- called <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Recently, 3GPP has added new features to long term evolution (LTE) that allow vehicles communicate directly with each other and surrounding objects. These short-range communications will play a key role in the so-called cellular vehicle-to-anything (C-V2X). As particular service, which be basis of most applications for automated connected cars, vehicle periodically broadcast information on its identity, status, movements through vehicle-to-vehicle (V2V) communications. Given importance this...

On the path to zero fatalities on roadways, all vehicles have periodically broadcast cooperative awareness messages (CAMs) in a timely and reliable manner, even areas of high traffic density. The carrier senses multiple access with collision avoidance (CSMA/CA) scheme IEEE 802.11, de-facto standard for vehicular communications, is known offer no reliability packets that cannot be acknowledged, poorly perform at network load due collisions interference. In this paper, an enhanced CSMA/CA...

Crowd sensing is a powerful tool to map and predict interests events. In the future, it could be boosted by an increasing number of connected vehicles sharing information intentions. This will made available on board wireless devices able continuously communicate with other environment. Among enabling technologies, visible light communication (VLC) represents low cost solution in short term. spite fact that vehicular communications cannot rely sole VLC due limitation provided which allows...

Vehicular ad hoc networks (VANETs) enable higher safety, enhanced mobility management, and new infotainment services. Currently, the foreseen standard at medium access control (MAC) layer for VANETs is IEEE 802.11p, which based on carrier sense multiple with collision avoidance (CSMA/CA). However, under heavy traffic conditions, CSMA/CA suffers from a high probability, particularly in presence of hidden terminals. Furthermore, adoption request-to-send/clear-to-send (RTS/CTS) mechanism not...

Resource allocation is a challenging issue in multiuser wireless systems. Since users are not all the same conditions and do achieve performance given amount of resources, resource must typically deal with following two conflicting objectives: on one hand, overall should be maximized, tending to prioritize few better conditions, other fairness among consequently reducing performance. Identifying compromise that somehow optimum but simple this aspect normally worsened by absence curve...

In this paper, we consider a multi-user scenario where an arbitrary number of sources transmit their messages to the intended destinations by means relays in decode-and-forward two-hop mechanism. To minimize interference generated scenario, two opportunistic relay selection mechanisms are proposed and investigated. The performance is analytically evaluated, terms outage probability average achievable rate, under assumption that nodes distributed according Poisson point process. Asymptotical...