Modeling vanet deployment in urban settings

Abstract

The growing interest in wireless Vehicular Ad Hoc Networks (VANETs) has prompted greater research into simulation models that better reflect urban VANET deployments. Still, we lack a systematic understanding of the required level of simulation details in modeling various real-world urban constraints. In this work, we developed a series of simulation models that account for street layout, traffic rules, multilane roads, acceleration-deceleration, and RF attenuation due to obstacles. Using real and controlled synthetic maps, we evaluated the sensitivity of the simulation results toward these details. Our results indicate that the delivery ratio and packet delays in VANETs are more sensitive to the clustering effect of vehicles at intersections and their accelerationdeceleration. The VANET performance appears to be only marginally affected by the simulation of multiple lanes and careful synchronization at traffic signals. We also found that the performance in dense VANETs improves significantly when routing decisions are limited to a wireless backbone of mesh nodes, whereas in sparse VANETs, performance improves when vehicles also participate in ad hoc routing. Finally, through measurement and analysis of signal strengths around urban city blocks, we show that the effect of signal attenuation due to physical obstacles can potentially be parameterized in simulations. Our work provides a starting point for further understanding and development of more accurate VANET simulation models.

A Universal Geocast Scheme for Vehicular Ad Hoc Networks

“…Little study has been carried out in this realm. Here we use a model developed in [14] where the authors perform logarithmic linear regressions to derive power-distance relations from their signal measurements around a block of buildings.…”

“…The mobility model includes each vehicle following its immediate leader, keeping the same distance with it all the time. The path loss model deployed for computing the transmission powers is the wellknown two-ray model to reach vehicles to which we have LOS and the experimental relations developed in [14] to reach Non-LOS vehicles around buildings. Furthermore, we consider communications to be carried out in the control channel at a rate of 6 Mbps and a packet length of 250 bytes.…”

A Framework for Engineering Pervasive Applications Applied to Intra-vehicular Sensor Network Applications

“…In particular, they consider the relevant issue of designing an in-vehicle information system that does not negatively affect cognitive processing and driving performance by delivering inappropriate and/or inaccurate information to the driver; and [11], is which a simulation tool for deploying VANET applications is shown. In particular, a series of simulation models that account for street layout, traffic rules, multilane roads, acceleration-deceleration, and RF attenuation due to obstacles are presented.…”

Improving Vehicular ad hoc Network Protocols to Support Safety Applications in Realistic Scenarios

“…The Mahajan et al [MPGW07] approach uses empirically measured data from real urban settings to capture the impact of dierent factors on radio signals in a few simulation parameters.…”

“…In fact, only the Nakagami model uses a probabilistic distribution. Table 4.7 compares ve of the most representative RPMs provided by the ns-2 simulator, and two others proposed in [MK06] and [MPGW07]. When studying the results presented in [MK06], we realize that the simulation scenario is constrained to an orthogonal grid, which could not represent a typical European city where the streets' layout is usually irregular.…”