scholarly journals Efficient Maintenance of AODV Routes in the Vehicular Communication Environment with Sparsely Placed Road Side Units

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Chanhyuk Cho ◽  
Sanghyun Ahn
Keyword(s):  
Recovery Time ◽  
Vehicular Communication ◽  
The Road ◽  
Communication Environment ◽  
Streaming Services ◽  
Routing Mechanism ◽  
V2v Communications ◽  
On The Road ◽  
Road Side Units ◽  
Route Recovery

Thanks to the vehicular communication network, vehicles on the road can communicate with other vehicles or nodes in the global Internet. In this study, we propose an enhanced routing mechanism based on AODV so that road side units (RSUs) can provide continuous services such as video streaming services to vehicles which may be intermittently located outside of the coverage areas of RSUs. In the highway environment with sparsely placed RSUs, the communications between RSUs and vehicles are frequently disconnected due to high vehicular speeds. To resolve this problem, both V2I and V2V communications are utilized. In order to reduce the route recovery time and the number of route failures in the sparsely placed RSU environment, backup routes are established through the vehicles with longer direct communication duration with the RSU. The backup route substitutes the main route upon route disconnection. Also, for the efficient handover to the next RSU, the route shortening mechanism is proposed. For the performance evaluation of the proposed mechanism, we carried out the NS-3-based simulations.

scholarly journals Investigating and Modeling of Cooperative Vehicle-to-Vehicle Safety Stopping Distance

2021 ◽  
Vol 13 (3) ◽  
pp. 68
Author(s):  
Steven Knowles Flanagan ◽  
Zuoyin Tang ◽  
Jianhua He ◽  
Irfan Yusoff
Keyword(s):  
High Reliability ◽  
Base Station ◽  
Ieee 802.11P ◽  
Packet Losses ◽  
The Road ◽  
V2v Communication ◽  
Stopping Distance ◽  
Vehicle To Vehicle ◽  
V2v Communications ◽  
On The Road

Dedicated Short-Range Communication (DSRC) or IEEE 802.11p/OCB (Out of the Context of a Base-station) is widely considered to be a primary technology for Vehicle-to-Vehicle (V2V) communication, and it is aimed toward increasing the safety of users on the road by sharing information between one another. The requirements of DSRC are to maintain real-time communication with low latency and high reliability. In this paper, we investigate how communication can be used to improve stopping distance performance based on fieldwork results. In addition, we assess the impacts of reduced reliability, in terms of distance independent, distance dependent and density-based consecutive packet losses. A model is developed based on empirical measurements results depending on distance, data rate, and traveling speed. With this model, it is shown that cooperative V2V communications can effectively reduce reaction time and increase safety stop distance, and highlight the importance of high reliability. The obtained results can be further used for the design of cooperative V2V-based driving and safety applications.

Surveillance on-the-road: Vehicular tracking and reporting by V2V communications

2014 ◽  
Vol 67 ◽  
pp. 154-163 ◽  
Author(s):  
Lien-Wu Chen ◽  
Yu-Chee Tseng ◽  
Kun-Ze Syue
Keyword(s):  
The Road ◽  
V2v Communications ◽  
On The Road ◽  
Vehicular Tracking

scholarly journals 5G-Enabled Autonomous Driving Demonstration with a V2X Scenario-in-the-Loop Approach

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7344
Author(s):  
Zsolt Szalay ◽  
Dániel Ficzere ◽  
Viktor Tihanyi ◽  
Ferenc Magyar ◽  
Gábor Soós ◽  
...  
Keyword(s):  
Autonomous Vehicles ◽  
Mass Communication ◽  
Real Life ◽  
Autonomous Driving ◽  
Mobile Technologies ◽  
Low Latency ◽  
Vehicular Communication ◽  
Digital Twin ◽  
The Road ◽  
On The Road

Autonomous vehicles are at the forefront of interest due to the expectations of changing transportation for the better. In order to make better decisions on the road, vehicles use information from various sources: their own sensors, messages arriving from surrounding vehicles and objects, as well as from centralized entities—including their own Digital Twin. Certain decisions require the information to arrive with low latency and some of this information (such as video) requires broadband communication. Furthermore, the vehicles can populate an area, so they can represent mass communication endpoints that still need low latency and massive broadband. The mobility of the vehicles obviously requires the complete coverage of the roads with reliable wireless communication technologies fulfilling the previously mentioned needs. The fifth generation of cellular mobile technologies, 5G, addresses these requirements. The current paper presents real-life scenarios—on the M86 highway and the ZalaZONE proving ground in Hungary—for the demonstration of vehicular communication with 5G support, where the cars exchange sensor and control information with each other, their environment, and their Digital Twins. The demonstrations were carried out through the Scenario-in-the-Loop (SciL) methodology, where some of the actionable triggers were not physically present around the vehicles, but sensed or simulated around their Digital Twin. The measurements around the demonstrations aim to reveal the feasibility of the 5G Non-Standalone Architecture for certain communication scenarios, and they mainly aim to reveal the current latency and throughput limitations under real-life conditions.

scholarly journals A Research on VANET: Various Broadcasting and Clustering Techniques

2019 ◽  
Vol 8 (6S4) ◽  
pp. 933-937
Keyword(s):  
Transport System ◽  
Road Safety ◽  
Transport Model ◽  
Intelligent Transport System ◽  
Vehicular Communication ◽  
Intelligent Transport ◽  
The Road ◽  
Paper Work ◽  
On The Road ◽  
Novel Applications

In present years, there is a rapid increase in number of vehicles flying on the road. The focus is to improve the road safety and navigations standards with the help of an intelligent transport system. There is a need for novel applications and services in the vehicular environment for security and comfort. Technical advancement has been developed to predict road accidents, to prevent collisions, to understanding road conditions, to access uninterrupted internet facilities to expand the transmission range, to extend the storage capacity and to avoid the interference of wireless links. The idea of this paper work is to develop an intelligent transport model to enhance the road safety and navigation process. There are many approaches in the n communication. Effective and efficient techniques are developed to detect the road conditions with the help of vehicular communication. This paper gives the background of intelligent vehicle transport system. Various literature on VANET modelling, clustering and its based algorithms are discussed. Followed by a review of hybrid cluster algorithms , MAC protocols for VANET road safety applications, multi-hop and multi-level broadcast protocol are discussed.

scholarly journals Novel Road Traffic Management Strategy for Rapid Clarification of the Emergency Vehicle Route Based on V2V Communications

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5120
Author(s):  
Radwa Ahmed Osman ◽  
Amira I. Zaki ◽  
Ahmed Kadry Abdelsalam
Keyword(s):  
Traffic Management ◽  
Management Strategy ◽  
Road Traffic ◽  
Emergency Vehicle ◽  
The Road ◽  
V2v Communication ◽  
Vehicle To Vehicle ◽  
Proposed Model ◽  
V2v Communications ◽  
On The Road

Vehicle-to-vehicle communication is a promising paradigm that enables all vehicles in the traffic road to communicate with each other to enhance traffic performance and increase road safety. Through vehicle-to-vehicle (V2V) communication, vehicles can understand the traffic conditions based on the information sent among vehicles on the road. Due to the potential delay caused by traffic jams, emergency vehicles may not be able to reach their destination in the required time, leading to severe losses. The case is more severe especially in developing countries where no emergency-vehicle-dedicated lanes are allocated. In this study, a new emergency vehicle route-clarifying strategy is proposed. The new clarifying strategy is based on vehicular traffic management in different interference medium scenarios. The proposed model aims, through V2V communication, to find the nearest vehicle with which to communicate. This vehicle plays an important role in reducing the travel time: as the emergency message is received, this vehicle will immediately communicate with all the neighboring vehicles on the road. Based on V2V communications, all the vehicles in the road will clear from the lane in the road for the emergency vehicle can safely reach its destination with the minimum possible travel time. The maximum distance between the emergency vehicle and the nearest vehicle was determined under different channel conditions. The proposed strategy applied an optimization technique to find the varied road traffic parameters. The proposed traffic management strategy was evaluated and examined through different assumptions and several simulation scenarios. The obtained results validated the effectiveness and the accuracy of the proposed model, and also indicated significant improvement in the network’s performance in terms of packet delivery ratio (PDR) and average end-to-end delay (E2E).

scholarly journals A Multi-Hop Data Dissemination Algorithm for Vehicular Communication

Computers ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 25 ◽  
Author(s):  
Odilbek Urmonov ◽  
HyungWon Kim
Keyword(s):  
Vehicular Networks ◽  
Data Dissemination ◽  
Propagation Distance ◽  
Ieee 802.11P ◽  
Local Dynamic ◽  
Vehicular Communication ◽  
Additional Time ◽  
The Road ◽  
Message Dissemination ◽  
On The Road

In vehicular networks, efficient multi-hop message dissemination can be used for various purposes, such a informing the driver about the recent emergency event or propagating the local dynamic map of a predefined region. Dissemination of warning information up to a longer distance can reduce the accidents on the road. It provides a driver additional time to react to the situations adequately and assists in finding a safe route towards the destination. The adopted V2X standards, ETSI TS’s C-ITS and IEEE 1609/IEEE 802.11p, specify only primitive multi-hop message dissemination schemes. IEEE 1609.4 standard disseminates the broadcast messages using the method of flooding, which causes high redundancy, severe congestion, and long delay during multi-hop propagation. To address these problems, we propose an effective broadcast message dissemination method. It introduces a notion of source Lateral Crossing Line (LCL) algorithm, which elects a set of relay vehicles for each hop based on the vehicle locations in a way that reduces the redundant retransmission and congestion, consequently minimizing the delays. Our simulation results demonstrated that the proposed method can achieve about 15% reduction in delays and 2 times the enhancement in propagation distance compared with the previous methods.

scholarly journals Adaptive Configuration of Mobile Roadside Units for the Cost-Effective Vehicular Communication Infrastructure

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Jaeho Lee ◽  
Sanghyun Ahn
Keyword(s):  
Early Stage ◽  
Low Cost ◽  
Cost Effective ◽  
Vehicular Communication ◽  
Communication Infrastructure ◽  
The Road ◽  
Integer Linear Programming Problem ◽  
Control Message ◽  
On The Road ◽  
Operational Expenditure

In this paper, we target to figure out an adaptive and efficient mechanism that deploys roadside units (RSUs), which are the major components of the vehicle-to-infrastructure (V2I) communication, so that vehicles on the road can have satisfactory connectivity to the vehicular communication infrastructure in a cost-effective way. Only with the conventional fixed RSUs (fRSUs), the coverage requirement of vehicles from the perspective of V2I communications cannot be easily met because of high vehicular mobility compared to the static nature of fRSUs and the high deployment and operational expenditure of fRSUs. Recently, mobile RSUs (mRSUs) mounted on public and commercial vehicles like buses are considered as the substitutes or the supplements of fRSUs. The research on mRSUs is in its early stage and mostly focuses on the deployment of mRSUs from a static viewpoint. In this paper, we consider the environment with densely deployed mRSUs, such as the city environment, thanks to low cost, in which multiple active mRSUs generate lots of control messages to form the mRSU backbone network. To overcome this inefficiency, we propose a mechanism in which each mRSU adaptively and effectively determines its own state, active or inactive, according to the states of its neighboring mRSUs and vehicles. For the NP-hardness proof, we formulate the problem as a 0-1 integer linear programming problem. We evaluate the performance of our mechanism in terms of the ratio of vehicles covered by active mRSUs and the control message overhead compared with the case of nonadaptive mRSU configuration (i.e., the case of all mRSU being active).

scholarly journals Share the Crowdsensing Data with Local Crowd by V2V Communications

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Chao Song ◽  
Ming Liu ◽  
Xili Dai
Keyword(s):  
User Satisfaction ◽  
Mobile Crowdsensing ◽  
The Road ◽  
V2v Communication ◽  
Truth Discovery ◽  
Academic Researchers ◽  
V2v Communications ◽  
On The Road ◽  
The Cost

With an increase in the number of mobile applications, the development of mobile crowdsensing systems has recently attracted significant attention from both academic researchers and industries. In mobile crowdsensing system, the remote cloud (or back-end server) harvests all the crowdsensing data from the mobile devices, and the crowdsensing data can be uploaded immediately via 3G/4G. To reduce the cost and energy consumption, many academic researchers and industries investigate the way of mobile data offloading. Due to the sparse distribution of the WiFi APs, offloading the crowdsensing data is often delayed. In this paper, compared with offloading data via WiFi APs, we investigate the communication and sharing of crowdsensing data by vehicles near the event (such as a pothole on the road), termed as a local crowd. In such crowd, a vehicle can transmit the data to each other by vehicle-to-vehicle (V2V) communication. The crowd-based approach has a lower delay than the offloading-based approach, by considering the quality of truth discovery. We define a utility function related to the crowdsensing data shared by the local crowd in order to quantify the trade-off between the quality of the truth discovery and the user satisfaction. Our extensional simulations verify the effectiveness of our proposed schemes.

Community Colleges: Vital Partners on the Road to Diversity

ASHA Leader ◽  
2006 ◽  
Vol 11 (5) ◽  
pp. 14-17 ◽  
Author(s):  
Shelly S. Chabon ◽  
Ruth E. Cain
Keyword(s):  
Community Colleges ◽  
The Road ◽  
On The Road
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