Interference and Efficient Transmission Range via V2V Communication at Roads Traffic Intersections

Vehicle-to-Vehicle (V2V) communication technology has dramatically promoted many promising applications to enhance traffic safety, mobility, and sustainability. However, However, we still lack the understanding of some fundamental properties of V2V technology under urban traffic conditions, such as interference at traffic intersections. Motivated by this view, this study develops the mathematical formulations to capture the worst-case interference at traffic intersections, considering the macroscopic traffic flow conditions and critical road geometric features including intersection diameter D, and intersection angle {\alpha}. Built upon these formulations, we develop a mathematical model to approximate a conservative transmission range to sustain the successful V2V transmission at a traffic intersection. Our experiments illustrate that the proposed analytical formulations can provide accurate approximations for the interference and the corresponding transmission range at orthogonal (non-orthogonal) traffic intersections under various traffic congestion levels. Furthermore, this study conducted other experiments to understand how intersection geometric features (such as (D, {\alpha})) impact V2V communication at traffic intersections. The results illustrate that severer interference and smaller transmission range occur at a smaller intersection (with smaller diameter D) under heavy traffic congestion level. And the orthogonal intersection gives critical thresholds (such as severest interference and minimum transmission range) under all different traffic conditions, which help in understanding the V2V communication performance at an urban traffic intersection. These findings will potentially help to develop efficient MAC algorithms adaptive to urban traffic conditions, and further support various ITS applications using V2V communication. interference and transmission range.Comment: 13 pages, 19 figure

Outage Analysis of Cooperative NOMA in Millimeter Wave Vehicular Network at Intersections

In this paper, we study the impact and the improvement of using cooperative non-orthogonal multiple access scheme (NOMA) on a millimeter wave (mmWave) vehicular network at intersection roads. The intersections consists of two perpendicular roads. The transmission occurs between a source, and two destinations nodes with a help of a relay. We assume that the interference comes from as set of vehicles that are distributed as a one dimensional homogeneous Poisson point process (PPP). We derive closed form outage probability expressions for cooperative NOMA, and compare them with cooperative orthogonal multiple access (OMA). We show that, NOMA offers a significant improvement, especially for high data rates. However, there a condition imposed to the data rate, otherwise, the performance of NOMA will decreases dramatically. We show that as the nodes approach the intersection, the outage probability increases. Counter-intuitively, We show that, the non line of sigh (NLOS) scenario has a better performance than the line of sigh (LOS) scenario. The analysis is conducted using tools from stochastic geometry and is verified with Monte Carlo simulations

On the Outage Probability of Vehicular Communications at Intersections Over Nakagami-m Fading Channels

In this paper, we study vehicular communications (VCs) at intersections, in the presence of interference over Nakagami-m fading channels. The interference are originated from vehicles located on two perpendicular roads. We derive the outage probability, and closed forms are obtained. The outage probability is derived when the destination is on the road (vehicle, cyclist, pedestrian) or outside the road (base station, road side unit). We compare the performance of line of sight (LOS) scenarios and non-line of sight (NLOS) scenarios, and show that NLOS scenarios offer better performance than LOS scenarios. We also compare intersection scenarios with highway scenarios, and show that the performance of intersection scenarios are worst than highway scenarios as the destination moves toward the intersection. Finally, we investigate the performance of VCs in a realistic scenario involving several lanes. All the analytical results are validated by Monte-Carlo simulations.Comment: arXiv admin note: text overlap with arXiv:1807.08532, arXiv:1909.01989, arXiv:1909.12392, arXiv:1904.1102

Non-Orthogonal Multiple Access Performance for Millimeter Wave in Vehicular Communications

In this paper, we study the performance of millimeter wave (mmWave) vehicular communications (VCs) using non-orthogonal multiple access scheme (NOMA) at road intersections, since there areas are more prone to accidents. We study the case when the intersection involves two perpendicular lanes, we then extend the study to an intersection with several lanes. The transmission occurs between a source, and two destinations. The transmission experiences interference originated from a set of vehicles that are distributed as a Poisson point process (PPP). Our analysis includes the effects of blockage from buildings and vehicles at intersections. Closed form outage probability expressions are obtained. We show that as the nodes reach the intersection, the outage probability increases. Counter-intuitively, we show that the non line of sigh (NLOS) scenario has a better performance than the line of sigh (LOS) scenario. Finally, we compare the performance of mmWave NOMA with OMA, and we show that NOMA offers a significant improvement over OMA mmWave vehicular networks. The analysis is verified by Monte-Carlo simulation.Comment: arXiv admin note: substantial text overlap with arXiv:1904.11022, arXiv:1909.0198

Performance Analysis of Cooperative Communications at Road Intersections Using Stochastic Geometry Tools

Vehicular safety communications (VSCs) are known to provide relevant contributions to avoid congestions and prevent road accidents, and more particularly at road intersections since these areas are more prone to accidents. In this context, one of the main impairments that affect the performance of VSCs are interference. In this paper, we develop a tractable framework to model cooperative transmissions in presence of interference for VSCs at intersections. We use tools from stochastic geometry, and model interferer vehicles locations as a Poisson point process. First, we calculate the outage probability (OP) for a direct transmission when the received node can be anywhere on the plan. Then, we analyze the OP performance of a cooperative transmission scheme. The analysis takes into account two dimensions: the decoding strategy at the receiver, and the vehicles mobility. We derive the optimal relay position, from analytical and simulation results, for different traffic densities and for different vehicles mobility models. We also show that the OP does not improve after the number of infrastructure relays reached a threshold value. Finally, we show that the OP performance of VSCs is higher at intersections than on highways. We validated our analytical results by Monte-Carlo simulations.Comment: 31 pages, 10 figure