A Measurement-Based Multilink Shadowing Model for V2V Network Simulations of Highway Scenarios

Abstract

Abstract-Shadowing from vehicles can significantly degrade the performance of vehicle-to-vehicle (V2V) communication in multilink systems, e.g., vehicular ad-hoc networks (VANETs). It is thus important to characterize and model the influence of common shadowing objects like cars properly when designing these VANETs. Despite the fact that for multilink systems it is essential to model the joint effects on the different links, the multilink shadowing effects of V2V channels on VANET simulations are not yet well understood. In this paper we present a measurement based analysis of multilink shadowing effects in a V2V communication system with cars as blocking objects. In particular we analyze, characterize and model the large scale fading, both regarding the autocorrelation and the joint multilink cross-correlation process, for communication at 5.9 GHz between four cars in a highway convoy scenario. The results show that it is essential to separate the instantaneous propagation condition into line-of-sight (LOS) and obstructed LOS (OLOS), by other cars, and then apply an appropriate pathloss model for each of the two cases. The choice of the pathloss model not only influences the autocorrelation but also changes the cross-correlation of the large scale fading process between different links. By this, we conclude that it is important that VANET simulators should use geometry based models, that distinguish between LOS and OLOS communication. Otherwise, the VANET simulators need to consider the cross-correlation between different communication links to achieve results close to reality.

A Path Loss and Shadowing Model for Multilink Vehicle-to-Vehicle Channels in Urban Intersections

“…One aspect where little attention has been paid is the modeling of multilink cases, i.e., communication between with one or several transmitters and multiple receivers or vice versa. Exceptions to this include [6], where simultaneous analysis of the communication links was performed between four cars to capture the joint behavior of the shadow fading process in multiple links only for highway scenarios.…”

Aplicando Redes Sociais Veiculares para Aprimorar o Gerenciamento da Mobilidade Urbana

“…A segunda metade da equação refere-se ao indicador de intensidade do sinal recebido. O modelo aplicado foi o logdistance path-loss [Nilsson et al 2017], onde dé a distância Euclidiana entre os veículos, d 0é a distância de um ponto de referência até ao emissor, P L(d 0 )é a potência do ponto de referência até ao emissor, α representa o expoente do path-loss (varia de acordo com o ambiente) e Ψ σ singleé uma variável que descreve a atenuação do sinal de comunicação. Em poucas palavras, neste modelo a potência do sinal recebido decai logaritmicamente com a distância entre os veículos.…”

Hybrid-Vehcloud: An Obstacle Shadowing Approach for VANETs in Urban Environment

“…The radio transmissions are heavily affected by shadowing effects commonly known as obstacle shadowing [3,4]. Finding a solution for this problem plays an essential role in dense regions like a Manhattan and other downtown areas where buildings block radio propagation [4]. Assume vehicle V1 needs to disseminate messages to the nearby vehicles V2, V3, and V4.…”

“…= trans + q + cont + proc + prop (4) Where trans is the transmission delay, q is the queuing delay, cont is the contention delay, proc is the processing delay, and prop is the propagation delay.…”