An Efficient Channel Access Scheme for Vehicular Ad Hoc Networks

Abstract

properly cited.Vehicular Ad Hoc Networks (VANETs) are getting more popularity due to the potential Intelligent Transport Systems (ITS) technology. It provides many efficient network services such as safety warnings (collision warning), entertainment (video and voice), maps based guidance, and emergency information. VANETs most commonly use Road Side Units (RSUs) and Vehicle-toVehicle (V2V) referred to as Vehicle-to-Infrastructure (V2I) mode for data accessing. IEEE 802.11p standard which was originally designed for Wireless Local Area Networks (WLANs) is modified to address such type of communication. However, IEEE 802.11p uses Distributed Coordination Function (DCF) for communication between wireless nodes. Therefore, it does not perform well for high mobility networks such as VANETs. Moreover, in RSU mode timely provision of data/services under high density of vehicles is challenging. In this paper, we propose a RSU-based efficient channel access scheme for VANETs under high traffic and mobility. In the proposed scheme, the contention window is dynamically varied according to the times (deadlines) the vehicles are going to leave the RSU range. The vehicles with shorter time deadlines are served first and vice versa. Simulation is performed by using the Network Simulator (NS-3) v. 3.6. The simulation results show that the proposed scheme performs better in terms of throughput, backoff rate, RSU response time, and fairness.

Dynamic Priority-Based Efficient Resource Allocation and Computing Framework for Vehicular Multimedia Cloud Computing

“…Primary user (PU) transmissions are protected by using energy-based PU detection scheme, in which PU arrival probability is calculated based on the energy detection technique. In [11], the authors proposed a channel assignment scheme for VANETs, in which vehicles dynamically adopt the contention window (CW) size based on the vehicle's speed. In order to support the VANETs services, such as the speed-based lane changing, time of arrival (TOD), and collision avoidance some new methods are suggested in [16].…”

Alocação de canais para redes veiculares baseada no comportamento do nó

“…Em Hussain et al (2017), os autores apresentam um esquema de acesso ao canal centralizado para redes veiculares, considerando o tempo que o veículo leva para sair do alcance da RSU. O esquema prioriza a mobilidade e serviços de emergências no processo de alocação de canal, mas não considera o tráfego na rede.…”

Predicting the Route of the Longest Lifetime and the Data Packet Delivery Time between Two Vehicles in VANET

“…Vehicular ad hoc networks (VANETs) allow vehicles to communicate each other directly through the On Board Unit (OBU) device forming vehicle-to-vehicle communication, or with existing infrastructure via fixed equipment beside the road called Road Side Unit (RSU) forming vehicle-toinfrastructure communication [1,2]; and they are a key component of intelligent transportation systems (ITS) [3]. VANETs support a wide range of safety applications to make accurate decisions by drivers and to help road traffic authorities for better control and mitigation of traffic congestion.…”