Abstract

In wireless communication It is important to find a reliable broadcasting protocol that is especially designed for an optimum performance of public-safety and data travelling related applications. Using RSU and OBU, there are four novel ideas presented in this research work, namely choosing the nearest following node as the network probe node, headway-based segmentation, non-uniform segmentation and application adaptive. The integration of these ideas results in a protocol that possesses minimum latency, minimum probability of collision in the acknowledgment messages and unique robustness at different speeds and traffic volumes. Wireless communications are becoming the dominant form of transferring information,and the most active research field. In this dissertation, we will present one of the most applicable forms of Ad-Hoc networks; the Vehicular Ad-Hoc Networks (VANETs). VANET is the technology of building a robust Ad-Hoc network between mobile vehicles and each other, besides, between mobile vehicles and roadside units.

Highlights

  • Efforts related to traffic management in big cities led to the promising technology of building a robust wireless mobile AdHoc network between vehicles and roadside units (RSUs, mounted in centralized locations such as intersections, parking lots or gas stations), referred to as a Vehicular Ad-Hoc Networks (VANET)

  • We assume that the reader is familiar with the following acronyms [2]-[7]: Ready/Clear to Send (RTS/CTS), Contention window (CW), Short Interframe Space (SIFS), Distributed Coordination Function IFS (DIFS), Network Allocation Vector (NAV), and the Hidden node problem

  • If vehicles are running at different speeds, distance-based segmentation logically fails in simulating the dangerous situation

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Summary

INTRODUCTION

Efforts related to traffic management in big cities led to the promising technology of building a robust wireless mobile AdHoc network between vehicles (with On-Board-Units, OBUs) and roadside units (RSUs, mounted in centralized locations such as intersections, parking lots or gas stations), referred to as a Vehicular Ad-Hoc Networks (VANET). Broadcasting of messages in VANET environments plays a crucial rule in almost every application and represents a critical challenge that needs novel solutions based on the unique characteristics of VANETs. The target is to optimally develop a reliable highly distributed broadcasting protocol minimizing collisions and latency (especially in cases of public-safety related applications) without prior control messaging while considering different speeds, environments (urban and rural), and applications. We propose an application adaptive (multi-mode) headway-based protocol for reliable broadcasting (particular for public -safety related messages) that is robust at different speeds and traffic volumes

RELATED PROTOCOLS
Reliable Protocols
Selective ACK
Dissemination Protocols
Single relay
PROPOSED PROTOCOL
Reversing the Order of Priority
Headway Based Segmentation
Mode 1- Furthest Following Node
Mode 3 - Furthest Leading Node
Procedure of the source vehicle
Procedure of other vehicles
SIMULATIONS
CONCLUSION
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